US20100305612A1 - Polyaxial Cross Connector and Methods of Use Thereof - Google Patents

Polyaxial Cross Connector and Methods of Use Thereof Download PDF

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Publication number
US20100305612A1
US20100305612A1 US12/856,235 US85623510A US2010305612A1 US 20100305612 A1 US20100305612 A1 US 20100305612A1 US 85623510 A US85623510 A US 85623510A US 2010305612 A1 US2010305612 A1 US 2010305612A1
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Prior art keywords
elongated member
ferrule
spinal
hook shape
rod
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Abandoned
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US12/856,235
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Carl Michael Nilsson
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Innovative Delta Technology LLC
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Innovative Delta Technology LLC
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Priority to US12/856,235 priority Critical patent/US20100305612A1/en
Publication of US20100305612A1 publication Critical patent/US20100305612A1/en
Priority to US13/086,938 priority patent/US9962194B2/en
Abandoned legal-status Critical Current

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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7049Connectors, not bearing on the vertebrae, for linking longitudinal elements together

Definitions

  • the body is the largest part of a vertebra, and is more or less cylindrical in shape. Its upper and lower surfaces are flattened. In front, the body is convex from side to side and concave from above downward. Behind, it is flat from above downward and slightly concave from side to side.
  • the pedicles are two short, thick processes, which project backward, one on either side, from the upper part of the body, at the junction of its posterior and lateral surfaces.
  • a rod or more commonly, a pair of rods is disposed longitudinally, lateral to each side of the spine and adjacent along the length of the spine in the region of concern.
  • the rod is arranged according to the anatomy and the correction desired.
  • the rod is aligned along the spine and engages various vertebrae along its length.
  • fixation elements such as anchors, attached to vertebral bodies by a bone screw that is inserted into the pedicle and penetrates into the body of the vertebra.
  • the cross connector system would typically require an additional mid-spine connector piece to join connector rods extending from opposing support rods approximately over the spine. Utilization of such a connector may require the excising of bone to prevent the spinous process of the spine from interfering with placement of the mid-spine connector. Additionally, such connection systems have required multiple components requiring multiple assembly steps during surgery. Also, prior systems have involved the securing of a screw assembly to a cross connector or spinal support rod by direct contact between a set screw and the rod. This contact causes subtle damage to the rod caused by plastic deformation of the rod by the set screw.
  • one embodiment of the present invention provides a connector device for a spinal stabilization apparatus that comprises a first elongated member having first and second ends, and is adapted to engage a first spinal stabilizer rod proximal to the first end of the elongated member and is further adapted to engage a spinal cross connector rod proximal to a second end of the first elongated member.
  • the first end of the first elongated member comprises a hook shape and a ferrule and may engage the first spinal stabilizer rod within about 20 degrees of perpendicular to the spinal stabilizer rod in any direction.
  • the edges of the hook shape may also be chamfered to permit angulation of the spinal support rod.
  • the second end of the first elongated member may be adapted to engage the spinal cross connector rod through a slot in the second end, and the slot in the second end of the first elongated member may be further adapted to receive a set screw to secure the cross connector rod in the second end.
  • the hook shape of the first end of the first elongated member comprises two opposed tabs separated by a first gap which forms an entrance into a channel of the hook shape.
  • the ferrule may have an outside diameter that is greater than the first gap.
  • a spring or other retainer may be present in the first end of the first elongated member for maintaining the ferrule in contact with one or more side walls of the hook shape proximal to the first gap.
  • the method of treating a patient may additionally comprise attaching a second longitudinal spinal stabilizer to the spine of a patient and attaching a second elongated member to the second spinal stabilizer.
  • the second elongated member is similar to the first elongated member and may have first and second ends.
  • the second spinal stabilizer may be engaged to the first end of the second elongated member, and the first end of the second elongated member may be adapted to engage the second longitudinal spinal stabilizer within about 20 degrees of perpendicular to the second longitudinal spinal stabilizer in any direction.
  • the first end of the second elongated member may also comprise a hook shape and a ferrule adapted to engage the second spinal stabilizer, with the ferrule being adapted to be seated within the hook shape.
  • the hook shape of the first end of the second elongated member may comprise two opposed tabs separated by a second gap which forms an entrance into a channel of the hook shape.
  • the ferrule may have an outside diameter that is greater than the second gap.
  • the first end of the second elongated member may additionally comprise a spring for maintaining the ferrule in contact with one or more side walls of the hook shape proximal to the second gap.
  • FIG. 1A is a perspective view of the polyaxial cross connector of the present invention
  • FIG. 2C is an exploded view of the embodiment shown in FIGS. 2A and 2B from an alternate elevation.
  • the present invention is directed toward a spinal stabilization apparatus for connecting and immobilizing spinal support rods located laterally on opposite sides of a section of a spine.
  • the apparatus includes first and second hook members.
  • the first hook member is adapted to engage a first longitudinal spinal support stabilizer located laterally to a first side of a section of a spinal column
  • the second hook member is adapted to engage a second longitudinal spinal support stabilizer located laterally to a second side of a section of a spinal column.
  • Each of the first and second hook members are also adapted to engage opposite ends of a cross connector rod.
  • First and second hook members may be further adapted to permit angulation of an attached spinal support rod relative to the hook end member.
  • first and second hook end members may be adapted to attach to a spinal support rod at an angle of between about 70 and 90 degrees in any direction, i.e., through an arc of about 40 degrees in any direction centered on a perpendicular attachment to the spinal support rod.
  • a spinal stabilization apparatus 10 includes first 12 and second 14 hook members.
  • First hook member 12 is adapted to engage a first longitudinal spinal support stabilizer rod 16 located laterally to a first side of a section of a spinal column
  • the second hook member 14 is adapted to engage a second longitudinal spinal support stabilizer rod 18 located laterally to a second side of a section of a spinal column.
  • Each of the first and second hook members 12 , 14 are also adapted to engage opposite ends of a cross connector rod 20 , which is secured in first and second hook members 12 , 14 by set screws 22 .
  • FIGS. 2A , 2 B and 2 C illustrate an arrangement of the first hook member 12 . It should be understood, however, that similar or identical structures and components may also present in second hook member 14 .
  • Hook member 12 is an elongated structure with a hook end 32 and cross connector end 34 on opposite ends of hook member 12 .
  • Hook end 32 may be generally described as hook shaped, comprising a hook end channel 36 passing through the hook shape and entering into a generally spherical cavity 37 .
  • Hook member 12 (and also hook member 14 ) also includes a ferrule 24 , which is C-shaped or generally spherical in shape with a generally cylindrical channel 26 located therethrough, creating an arcuate seat 28 in the walls of channel 26 for receiving a stabilizer such as a rod 16 .
  • the open end of ferrule 24 includes two opposed tabs 40 located to each side of channel 26 .
  • Tabs 40 are configured in such a way that tabs 40 have a minor amount of flexibility, allowing them to flex outwardly as rod 16 is inserted into and passes into channel 26 and is ultimately secured in seat 28 .
  • Channel 26 has a cross-sectional configuration that corresponds to the cross-sectional configuration of rod 16 (or rod 18 ) such that arcuate seat 28 maintains contact with at least half of the portion of rod 16 that lies within channel 26 .
  • arcuate seat 28 maintains contact with more than half of the circumference of rod 16 that lies within channel 26 .
  • arcuate seat 28 maintains contact with about two thirds or more of the circumference of rod 16 that lies within channel 26 . In this manner, any load to be transferred between rod 16 and hook end 32 is distributed as evenly as possible across the length and width of seat 28 .
  • Ferrule 24 is adapted to be seated within cavity 37 in hook end 32 such that rods 16 , 18 may be engaged in ferrule 24 and pass through channel 36 .
  • Channel 36 is generally cylindrical, with a gap 31 between hook tabs 30 forming an entrance into channel 36 and forming the hook shape of hook end 32 .
  • Gap 31 is configured to allow rods 16 , 18 to pass into channel 36 .
  • gap 31 is essentially the same distance as the diameter of rods 16 , 18 .
  • gap 31 is up to 0.1 mm larger than the diameter of rods 16 , 18 .
  • Ferrule 24 may be further configured to allow it to be inserted into cavity 37 through channel 36 but with an outside diameter that prevents it from passing through gap 31 .
  • ferrule 24 has an outside diameter of about 6.5 mm, cavity 37 has a diameter of approximately 6.5 mm, gap 31 is about 5.5 mm wide and the diameter of rods 16 , 18 is about 5.5 mm. This provides for the insertion of ferrule 24 into cavity 37 and for the insertion of rods 16 , 18 into seat 28 of ferrule 24 through gap 31 but prevents ferrule 24 from passing through gap 31 .
  • Channel 36 may be further adapted to permit rotation of ferrule 24 within channel 36 and thereby allow angulation of spinal support rod 16 , 18 within channel 36 .
  • One possible adaptation is the presence of chamfered edges 38 surrounding channel 36 , allowing ferrule 24 and rod 16 , 18 to pivot within channel 36 .
  • rod 16 , 18 is capable of pivoting through an arc of approximately 40 degrees in any direction.
  • hook members 12 , 14 are adapted to attach to a spinal support rod at an angle of between about 70 and 90 degrees in any direction, i.e., through an arc of about 40 degrees in any direction centered on a perpendicular attachment to the spinal support rods.
  • hook members 12 , 14 are adapted to attach to a spinal rod at an angle of between 75 and 90 degrees in any direction, that is, though an arc of about 30 degrees in any direction centered on a perpendicular attachment. In another embodiment, hook members 12 , 14 are adapted to attach to a spinal rod at an angle of between about 80 and 90 degrees in any direction, that is, through an arc of about 20 degrees in any direction centered on a perpendicular attachment. In still another embodiment, hook members 12 , 14 are adapted to attach to a spinal rod at an angle of between 85 and 90 degrees in any direction, that is, through an arc of about 10 degrees in any direction centered on a perpendicular attachment.
  • Hook end 32 also includes a retainer such as spring 42 for maintaining ferrule 24 in channel 36 by keeping ferrule 24 in contact with side wall 46 of cavity 37 .
  • a retainer such as spring 42 for maintaining ferrule 24 in channel 36 by keeping ferrule 24 in contact with side wall 46 of cavity 37 .
  • Ferrule 24 may be configured such that it can not pass through gap 31 .
  • Spring 42 may be seated in a seat 44 within cavity 37 . It is also envisioned that other resilient components may be used in place of spring 42 .
  • a retainer may take the form of a resilient, flexible tab projecting from the inner wall of cavity 37 (not shown).
  • a Belleville washer (not shown) may also be used as a retainer.
  • Hook members 12 and 14 also each contain an aperture 50 , which passes through hook member 12 and accesses cavity 37 , allowing set screw 48 to contact ferrule 24 , as described more fully below.
  • Cross connector end 34 of hook members 12 , 14 comprises a cavity 50 adapted to receive cross connector rod 20 .
  • cavity 50 may be enclosed on three sides to allow cross connector rod 20 to be inserted into cavity 50 and engage hook member 12 at cross connector end 34 .
  • Cavity 50 may also include threads 52 to engage a set screw 54 . When cross connector rod 20 is inserted into cavity 50 , set screw 54 contacts cross connector rod 20 and secures it in place in cross connector end 34 .
  • rod 16 is capable of rotating through an arc of approximately 40 degrees in any direction
  • second hook member 14 permit rod 18 to be angulated through an arc of approximately 40 degrees in any direction, with the arc centered on a perpendicular attachment.
  • rods 16 , 18 may be angulated through hook members 12 , 14 not only side-to-side, or up-and-down relative to the central axis of hook members 12 , 14 , but both side-to-side and up-and-down simultaneously.
  • support rods 16 and 18 may be angled a total of up to 40 degrees from parallel in any direction while still directly connecting the first and second hook members 12 , 14 with a substantially straight cross connector rod 20 .
  • a connection may still be directly made between first and second hook members 12 , 14 with a single cross connector rod 20 .
  • cross connector rod 20 may be bent with an instrument for bending spinal rods, such as an instrument known in the art as a French Bender (not shown), to accommodate the greater angulation.
  • the present invention provides an apparatus and method for spinal stabilization utilizing only a single cross connector rod without the need for an intervening connector piece located between the hook members, thereby directly connect hook members 12 and 14 without an intervening connector.
  • the absence of an additional connector other than those directly connected to the spinal support rods, i.e. hook members 12 and 14 permits spinal stabilization with a decreased or even eliminated need for excision of bone, such as the spinous process, to permit installation of the stabilization system.
  • the cross connector system of the present invention would be utilized after spinal stabilization rods 16 , 18 have been secured to the spine using bone screws, such as pedicle screws.
  • Hook members 12 and 14 would typically be partially assembled prior to surgery, with ferrule 24 positioned within channel 36 and held in place by spring 42 or other similar structures.
  • Hook member 12 would be attached to rod 16 by sliding hook member over rod 16 and positioning a portion of rod 16 within channel 26 .
  • ferrule 24 is oriented in cavity 37 such that channel 26 cooperates with channel 36 of hook member 12 to permit alignment of rod 16 or rod 18 through both ferrule channel 26 and hook end channel 36 .
  • cross connector rod 20 is then inserted into each cavity 50 of cross connector end 34 of hook members 12 , 14 .
  • the angulation of hook members 12 , 14 relative to a perpendicular position on support rods 16 , 18 allows the use of a single cross connector rod 20 between hook members 12 and 14 without resorting to an additional connector located between support rods 16 , 18 .
  • This allows a surgeon to utilize fewer components in a spinal stabilization system than previously needed.
  • a surgeon may simply select a cross connector rod of appropriate length to connect first and second hook members and bend it the appropriate amount if necessary.
  • a set screw 22 may be used to secure cross connector rod 20 in cavity 50 .
  • any final adjustments to the angulation of rods 16 and 18 may be performed and ferrule 24 may be permanently secured into position with a set screw 48 that is inserted into a set screw aperture 50 .
  • set screw 48 keeps ferrule 24 in constant contact with side wall 46 and does not allow ferrule 24 to move upward into channel 36 away from side wall 46 even temporarily, thereby securing rod 16 , 18 .
  • the engagement of set screw 48 against ferrule 24 results in ferrule 24 being locked in place with arcuate seat 28 at least partially surrounding rods 16 , 18 .
  • Set screw 48 does not however, directly engage rods 16 , 18 .
  • set screw 48 does not etch or otherwise deform or damage rods 16 , 18 and the possibility of damage to rods 16 , 18 during use is minimized or eliminated.
  • ferrule 24 would ordinarily be permanently secured in place after cross connector 20 is secured in cavities 50 , such a sequence of assembly is not necessarily required.
  • set screw 48 could be utilized as described above to secure ferrule 24 in place before cross connector 20 is secured in place.
  • the present spinal stabilization system may also be adjusted in place after set screws 48 and 22 have been secured in place by loosening one or more set screws, making the necessary adjustments and re-securing the set screws in place.
  • the present invention provides a self-adjusting spinal stabilization system.
  • Ferrule 24 may rotate within cavity 37 to allow a particular angulation of hook members 12 , 14 as dictated by the patient's anatomy until set screws 48 are fully engaged with ferrule 24 . This eliminates the need for separate adjustment of a connector in the mid-spine region as with prior systems, which only allow a hook member to attach to a spinal support rod only perpendicularly.

Abstract

A connector device for a spinal stabilization apparatus comprises a first elongated member having first and second ends, and is adapted to engage a first spinal stabilizer rod proximal to the first end of the elongated member and is further adapted to engage a spinal cross connector rod proximal to a second end of the first elongated member. The first end of the first elongated member comprises a hook shape and a ferrule and may engage the first spinal stabilizer rod within about 20 degrees of perpendicular to the spinal stabilizer rod in any direction. The ferrule is adapted to be seated within the hook shape and is further adapted to engage the first spinal stabilizer rod. A second elongated member substantially similar to the first may additionally be used in a spinal stabilization apparatus. The connector device may be used in a method of treating a patient.

Description

    CROSS REFERENCED TO RELATED APPLICATION
  • This application is a continuation of U.S. application Ser. No. 11/623,180, filed Jan. 15, 2007, now U.S. Pat. No. ______, which is incorporated by reference herein.
  • BACKGROUND OF THE INVENTION
  • This invention relates to fixation devices for the spinal column. More particularly, this invention relates to a connector for connecting spinal stabilization rods located on opposing sides of the spinal column in a spinal fixation device and associated components. Specifically, this invention relates to a cross connector system that allows for connection of spinal stabilization rods located on opposite sides of the spinal column even when the rods are oriented along axis that do not intersect.
  • The spine formed of a series of bones called vertebrae. There are 33 vertebrae, which are grouped as cervical, thoracic, lumbar, sacral, and coccygeal vertebrae, according to the regions of the spine they occupy. A typical vertebra consists of two essential parts, an anterior segment or body, and a posterior part, or vertebral or neural arch. These two parts enclose a foramen, the vertebral foramen. Together, the vertebral foramen of the vertebrae form a canal for the protection of the spinal cord. The vertebral arch consists of a pair of pedicles and a pair of laminae.
  • The body is the largest part of a vertebra, and is more or less cylindrical in shape. Its upper and lower surfaces are flattened. In front, the body is convex from side to side and concave from above downward. Behind, it is flat from above downward and slightly concave from side to side. The pedicles are two short, thick processes, which project backward, one on either side, from the upper part of the body, at the junction of its posterior and lateral surfaces.
  • Over the years, various techniques and systems have been developed for correcting spinal injuries and/or degenerative spinal processes. Spinal correction frequently requires stabilizing a portion of the spine to facilitate fusing portions of the spine or other correction methodologies. Medical correction of this type is frequently employed for many spinal conditions, such as, for example, degenerative disc disease, scoliosis, spinal stenosis, or the like. Frequently, these corrections also require the use of implants, such as, bone grafts. Stabilizing the spine allows bone growth between vertebral bodies such that a portion of the spine is fused into a solitary unit.
  • Several techniques and systems have been developed for correcting and stabilizing the spine and facilitating fusion at various levels of the spine. In one type of system, a rod or more commonly, a pair of rods is disposed longitudinally, lateral to each side of the spine and adjacent along the length of the spine in the region of concern. The rod is arranged according to the anatomy and the correction desired. In this system, the rod is aligned along the spine and engages various vertebrae along its length. The rod or rods engage opposite sides of the spine using fixation elements, such as anchors, attached to vertebral bodies by a bone screw that is inserted into the pedicle and penetrates into the body of the vertebra.
  • Anatomy and correction frequently require aligning the rod and screw at various angles along the length of the portion of correction. In order to provide this alignment, polyaxial screws/anchors have been developed. Many variations of bone screw and rod fixation systems exist on the market today. However, prior systems have been limited in the amount of angulation permitted relative to the place of attachment to the spine. In extreme cases, even with polyaxial screws, the spinal stabilization rods may diverge in their orientation in not just one, but two or even three planes. Such divergence makes connection of the rods difficult. Stated another way, prior cross connector systems typically provided a connector rod that was attached to and extended from the spinal support rods perpendicularly. When the spinal support rods were non-parallel relative to each other, as is often the case, the cross connector system would typically require an additional mid-spine connector piece to join connector rods extending from opposing support rods approximately over the spine. Utilization of such a connector may require the excising of bone to prevent the spinous process of the spine from interfering with placement of the mid-spine connector. Additionally, such connection systems have required multiple components requiring multiple assembly steps during surgery. Also, prior systems have involved the securing of a screw assembly to a cross connector or spinal support rod by direct contact between a set screw and the rod. This contact causes subtle damage to the rod caused by plastic deformation of the rod by the set screw.
  • Therefore, there is a need for a spinal cross connector assembly that permits a wide range of angulation of spinal support rods relative to the spine and each other while providing an effective and secure lock of the cross connector and rod in the desired position. There is also a need for a mechanism of attachment of opposing spinal stabilizer or support rods to each other that minimizes the possibility of damage by a set screw securing the cross connector to the support rods.
  • SUMMARY OF THE INVENTION
  • It is, therefore, an aspect of the present invention to provide a connector device for a spinal stabilization apparatus that provides an increased amount of allowable angulations between spinal stabilizer rods on opposing sides of the spine.
  • In addition, it is another aspect of the present invention to provide a spinal cross connector assembly that provides a mechanism of attachment of spinal stabilizers or support rods to each other without the spinal stabilizers or support rods sharing a plane of orientation along the axes of the rods.
  • It is still another aspect of the present invention to provide a cross connector system that utilizes attachment mechanisms that minimize the possibility of damage to the rod by a set screw securing the cross connector to the support rod.
  • It is still another aspect of the present invention to provide a cross connector that provides a simple method of attachment of opposing support rods located on either side of a spine.
  • In general, one embodiment of the present invention provides a connector device for a spinal stabilization apparatus that comprises a first elongated member having first and second ends, and is adapted to engage a first spinal stabilizer rod proximal to the first end of the elongated member and is further adapted to engage a spinal cross connector rod proximal to a second end of the first elongated member. The first end of the first elongated member comprises a hook shape and a ferrule and may engage the first spinal stabilizer rod within about 20 degrees of perpendicular to the spinal stabilizer rod in any direction. The edges of the hook shape may also be chamfered to permit angulation of the spinal support rod. The second end of the first elongated member may be adapted to engage the spinal cross connector rod through a slot in the second end, and the slot in the second end of the first elongated member may be further adapted to receive a set screw to secure the cross connector rod in the second end.
  • The ferrule is adapted to be seated within the hook shape and is further adapted to engage the first spinal stabilizer rod. The hook shape of the first end of the first elongated member may comprise two opposed tabs separated by a first gap which forms an entrance into a channel of the hook shape. The ferrule may have an outside diameter that is greater than the width of the first gap. The first end of the first elongated member may additionally comprise a retainer, such as a spring, for maintaining the ferrule in contact with one or more side walls of the hook shape proximal to the first gap. The elongated member may additionally comprise an aperture, through which a set screw may be inserted to engage the ferrule and secure it in place.
  • A spinal stabilization apparatus may comprise a connector device as described above and may additionally comprise a second elongated member substantially similar to or even identical to the first elongated member.
  • The connector device may be used in a method of treating a patient. The method may comprise attaching at least a first longitudinal spinal stabilizer to the spine of a patient, and attaching a first elongated member to the spinal stabilizer. The first elongated member has first and second ends, and the first spinal stabilizer is engaged to the first end of the first elongated member. The first end of the elongated member is adapted to engage the first longitudinal spinal stabilizer within about 20 degrees of perpendicular to the first longitudinal spinal stabilizer in any direction. The first end of the first elongated member comprises a hook shape and a ferrule. The ferrule is adapted to engage the first spinal stabilizer rod and to be seated within the hook shape.
  • The hook shape of the first end of the first elongated member comprises two opposed tabs separated by a first gap which forms an entrance into a channel of the hook shape. The ferrule may have an outside diameter that is greater than the first gap. A spring or other retainer may be present in the first end of the first elongated member for maintaining the ferrule in contact with one or more side walls of the hook shape proximal to the first gap.
  • The method of treating a patient may additionally comprise attaching a second longitudinal spinal stabilizer to the spine of a patient and attaching a second elongated member to the second spinal stabilizer. The second elongated member is similar to the first elongated member and may have first and second ends. The second spinal stabilizer may be engaged to the first end of the second elongated member, and the first end of the second elongated member may be adapted to engage the second longitudinal spinal stabilizer within about 20 degrees of perpendicular to the second longitudinal spinal stabilizer in any direction. The first end of the second elongated member may also comprise a hook shape and a ferrule adapted to engage the second spinal stabilizer, with the ferrule being adapted to be seated within the hook shape. The hook shape of the first end of the second elongated member may comprise two opposed tabs separated by a second gap which forms an entrance into a channel of the hook shape. The ferrule may have an outside diameter that is greater than the second gap. The first end of the second elongated member may additionally comprise a spring for maintaining the ferrule in contact with one or more side walls of the hook shape proximal to the second gap.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1A is a perspective view of the polyaxial cross connector of the present invention;
  • FIG. 1B is a partially exploded view of the embodiment shown in FIG. 1A from an alternate elevation;
  • FIG. 2A is an exploded, perspective view of a hook end member of the embodiment of FIG. 1, as assembled;
  • FIG. 2B is an exploded view of the embodiment shown in FIG. 2A from an alternate elevation.
  • FIG. 2C is an exploded view of the embodiment shown in FIGS. 2A and 2B from an alternate elevation.
  • DETAILED DESCRIPTION OF THE INVENTION
  • The present invention is directed toward a spinal stabilization apparatus for connecting and immobilizing spinal support rods located laterally on opposite sides of a section of a spine. The apparatus includes first and second hook members. The first hook member is adapted to engage a first longitudinal spinal support stabilizer located laterally to a first side of a section of a spinal column, and the second hook member is adapted to engage a second longitudinal spinal support stabilizer located laterally to a second side of a section of a spinal column. Each of the first and second hook members are also adapted to engage opposite ends of a cross connector rod. First and second hook members may be further adapted to permit angulation of an attached spinal support rod relative to the hook end member. Stated another way, first and second hook end members may be adapted to attach to a spinal support rod at an angle of between about 70 and 90 degrees in any direction, i.e., through an arc of about 40 degrees in any direction centered on a perpendicular attachment to the spinal support rod.
  • In another embodiment, the first and second hook and members may be adapted to attach to a spinal support rod at an angle between about 75 and 90 degrees, that is, through an arc of about 30 degrees in any direction centered on a perpendicular attachment. In still another embodiment, the first and second hook and members may be adapted to attach to a spinal support rod at an angle between about 80 and 90 degrees, that is, through an arc of about 20 degrees in any direction centered on a perpendicular attachment.
  • The following examples should not be viewed as limiting the scope of the invention. The claims will serve to define the inventions. Additionally, it should be noted that elements of one example may be combined with elements of another example, except where the function of the components prohibits such combination. The following examples are non-limiting therefore in their arrangements and combinations of elements.
  • As shown in FIGS. 1A and 1B, a spinal stabilization apparatus 10 includes first 12 and second 14 hook members. First hook member 12 is adapted to engage a first longitudinal spinal support stabilizer rod 16 located laterally to a first side of a section of a spinal column, and the second hook member 14 is adapted to engage a second longitudinal spinal support stabilizer rod 18 located laterally to a second side of a section of a spinal column. Each of the first and second hook members 12, 14 are also adapted to engage opposite ends of a cross connector rod 20, which is secured in first and second hook members 12, 14 by set screws 22.
  • FIGS. 2A, 2B and 2C illustrate an arrangement of the first hook member 12. It should be understood, however, that similar or identical structures and components may also present in second hook member 14. Hook member 12 is an elongated structure with a hook end 32 and cross connector end 34 on opposite ends of hook member 12. Hook end 32 may be generally described as hook shaped, comprising a hook end channel 36 passing through the hook shape and entering into a generally spherical cavity 37.
  • Hook member 12 (and also hook member 14) also includes a ferrule 24, which is C-shaped or generally spherical in shape with a generally cylindrical channel 26 located therethrough, creating an arcuate seat 28 in the walls of channel 26 for receiving a stabilizer such as a rod 16. As a result of the presence of channel 26 in ferrule 24, the open end of ferrule 24 includes two opposed tabs 40 located to each side of channel 26. Tabs 40 are configured in such a way that tabs 40 have a minor amount of flexibility, allowing them to flex outwardly as rod 16 is inserted into and passes into channel 26 and is ultimately secured in seat 28. Channel 26 has a cross-sectional configuration that corresponds to the cross-sectional configuration of rod 16 (or rod 18) such that arcuate seat 28 maintains contact with at least half of the portion of rod 16 that lies within channel 26. In one embodiment, arcuate seat 28 maintains contact with more than half of the circumference of rod 16 that lies within channel 26. In another example, arcuate seat 28 maintains contact with about two thirds or more of the circumference of rod 16 that lies within channel 26. In this manner, any load to be transferred between rod 16 and hook end 32 is distributed as evenly as possible across the length and width of seat 28.
  • Ferrule 24 is adapted to be seated within cavity 37 in hook end 32 such that rods 16, 18 may be engaged in ferrule 24 and pass through channel 36. Channel 36 is generally cylindrical, with a gap 31 between hook tabs 30 forming an entrance into channel 36 and forming the hook shape of hook end 32. Gap 31 is configured to allow rods 16, 18 to pass into channel 36. In some embodiments, gap 31 is essentially the same distance as the diameter of rods 16, 18. In other embodiments, gap 31 is up to 0.1 mm larger than the diameter of rods 16, 18. Ferrule 24 may be further configured to allow it to be inserted into cavity 37 through channel 36 but with an outside diameter that prevents it from passing through gap 31.
  • In one example, ferrule 24 has an outside diameter of about 6.5 mm, cavity 37 has a diameter of approximately 6.5 mm, gap 31 is about 5.5 mm wide and the diameter of rods 16, 18 is about 5.5 mm. This provides for the insertion of ferrule 24 into cavity 37 and for the insertion of rods 16, 18 into seat 28 of ferrule 24 through gap 31 but prevents ferrule 24 from passing through gap 31.
  • Channel 36 may be further adapted to permit rotation of ferrule 24 within channel 36 and thereby allow angulation of spinal support rod 16, 18 within channel 36. One possible adaptation is the presence of chamfered edges 38 surrounding channel 36, allowing ferrule 24 and rod 16, 18 to pivot within channel 36. In one embodiment, rod 16, 18 is capable of pivoting through an arc of approximately 40 degrees in any direction. Stated another way, hook members 12, 14 are adapted to attach to a spinal support rod at an angle of between about 70 and 90 degrees in any direction, i.e., through an arc of about 40 degrees in any direction centered on a perpendicular attachment to the spinal support rods. In another embodiment, hook members 12, 14 are adapted to attach to a spinal rod at an angle of between 75 and 90 degrees in any direction, that is, though an arc of about 30 degrees in any direction centered on a perpendicular attachment. In another embodiment, hook members 12, 14 are adapted to attach to a spinal rod at an angle of between about 80 and 90 degrees in any direction, that is, through an arc of about 20 degrees in any direction centered on a perpendicular attachment. In still another embodiment, hook members 12, 14 are adapted to attach to a spinal rod at an angle of between 85 and 90 degrees in any direction, that is, through an arc of about 10 degrees in any direction centered on a perpendicular attachment.
  • Hook end 32 also includes a retainer such as spring 42 for maintaining ferrule 24 in channel 36 by keeping ferrule 24 in contact with side wall 46 of cavity 37. As mentioned above, ferrule 24 may be configured such that it can not pass through gap 31. Spring 42 may be seated in a seat 44 within cavity 37. It is also envisioned that other resilient components may be used in place of spring 42. For example, a retainer may take the form of a resilient, flexible tab projecting from the inner wall of cavity 37 (not shown). Alternatively, a Belleville washer (not shown) may also be used as a retainer. Hook members 12 and 14 also each contain an aperture 50, which passes through hook member 12 and accesses cavity 37, allowing set screw 48 to contact ferrule 24, as described more fully below.
  • Cross connector end 34 of hook members 12, 14 comprises a cavity 50 adapted to receive cross connector rod 20. As in the embodiment shown, cavity 50 may be enclosed on three sides to allow cross connector rod 20 to be inserted into cavity 50 and engage hook member 12 at cross connector end 34. Cavity 50 may also include threads 52 to engage a set screw 54. When cross connector rod 20 is inserted into cavity 50, set screw 54 contacts cross connector rod 20 and secures it in place in cross connector end 34.
  • As mentioned above, ferrule 24, cavity 37 and channel 36 are adapted to permit rod 16 to pivot within channel 36. In one embodiment, rod 16 is capable of rotating through an arc of approximately 40 degrees in any direction Likewise, the identical structures in second hook member 14 permit rod 18 to be angulated through an arc of approximately 40 degrees in any direction, with the arc centered on a perpendicular attachment. Stated another way, rods 16, 18 may be angulated through hook members 12, 14 not only side-to-side, or up-and-down relative to the central axis of hook members 12, 14, but both side-to-side and up-and-down simultaneously. In this way, support rods 16 and 18 may be angled a total of up to 40 degrees from parallel in any direction while still directly connecting the first and second hook members 12, 14 with a substantially straight cross connector rod 20. In those situations where rods 16 and 18 are angled more than 40 degrees from parallel to each other, a connection may still be directly made between first and second hook members 12, 14 with a single cross connector rod 20. In such a case, cross connector rod 20 may be bent with an instrument for bending spinal rods, such as an instrument known in the art as a French Bender (not shown), to accommodate the greater angulation. Therefore, even in cases where there is greater than 40 degrees of angulation in any direction, relative to a parallel condition between the rods, the present invention provides an apparatus and method for spinal stabilization utilizing only a single cross connector rod without the need for an intervening connector piece located between the hook members, thereby directly connect hook members 12 and 14 without an intervening connector. The absence of an additional connector other than those directly connected to the spinal support rods, i.e. hook members 12 and 14, permits spinal stabilization with a decreased or even eliminated need for excision of bone, such as the spinous process, to permit installation of the stabilization system.
  • In use, the cross connector system of the present invention would be utilized after spinal stabilization rods 16, 18 have been secured to the spine using bone screws, such as pedicle screws. Hook members 12 and 14 would typically be partially assembled prior to surgery, with ferrule 24 positioned within channel 36 and held in place by spring 42 or other similar structures. Hook member 12 would be attached to rod 16 by sliding hook member over rod 16 and positioning a portion of rod 16 within channel 26. As stated above, ferrule 24 is oriented in cavity 37 such that channel 26 cooperates with channel 36 of hook member 12 to permit alignment of rod 16 or rod 18 through both ferrule channel 26 and hook end channel 36. When rod 16 is passed through gap 31 and inserted into ferrule 24 in cavity 37, the resilience of spring 42 allows ferrule 24 to be temporarily and reversibly positioned upward into cavity 37, away from side wall 46. This allows tabs 40 to flex outward as rod 16, 18 passes into channel 26 becoming secured against arcuate seat 28. Once rod 16, 18 is secured in seat 28 and pressure against spring 42 is released, spring 42 again applies pressure to ferrule 24, forcing it into contact with side wall 46 and holding it in place there.
  • Once corresponding first and second hook members 12, 14 are attached to support rods 16, 18, cross connector rod 20 is then inserted into each cavity 50 of cross connector end 34 of hook members 12, 14. As mentioned above, the angulation of hook members 12, 14 relative to a perpendicular position on support rods 16, 18, allows the use of a single cross connector rod 20 between hook members 12 and 14 without resorting to an additional connector located between support rods 16, 18. This allows a surgeon to utilize fewer components in a spinal stabilization system than previously needed. A surgeon may simply select a cross connector rod of appropriate length to connect first and second hook members and bend it the appropriate amount if necessary. Once cross connector 20 is engaged in cavity 50, a set screw 22 may be used to secure cross connector rod 20 in cavity 50.
  • After cross connector 20 is secured in cavities 50 of hook members 12, 14, any final adjustments to the angulation of rods 16 and 18 may be performed and ferrule 24 may be permanently secured into position with a set screw 48 that is inserted into a set screw aperture 50. In contrast with spring 42, set screw 48 keeps ferrule 24 in constant contact with side wall 46 and does not allow ferrule 24 to move upward into channel 36 away from side wall 46 even temporarily, thereby securing rod 16, 18. The engagement of set screw 48 against ferrule 24 results in ferrule 24 being locked in place with arcuate seat 28 at least partially surrounding rods 16, 18. Set screw 48 does not however, directly engage rods 16, 18. Instead, pressure from set screw 48 is distributed to ferrule 24 and locking pressure is exerted against a relatively large surface area of rods 16, 18 by arcuate seat 28. In this way, set screw 48 does not etch or otherwise deform or damage rods 16, 18 and the possibility of damage to rods 16, 18 during use is minimized or eliminated.
  • Although it is envisioned that ferrule 24 would ordinarily be permanently secured in place after cross connector 20 is secured in cavities 50, such a sequence of assembly is not necessarily required. For example, in those situations where hook members 12 and 14 are attached to rods 16 and 18 in a substantially perpendicular position, set screw 48 could be utilized as described above to secure ferrule 24 in place before cross connector 20 is secured in place. The present spinal stabilization system may also be adjusted in place after set screws 48 and 22 have been secured in place by loosening one or more set screws, making the necessary adjustments and re-securing the set screws in place.
  • The present invention provides a self-adjusting spinal stabilization system. Ferrule 24 may rotate within cavity 37 to allow a particular angulation of hook members 12, 14 as dictated by the patient's anatomy until set screws 48 are fully engaged with ferrule 24. This eliminates the need for separate adjustment of a connector in the mid-spine region as with prior systems, which only allow a hook member to attach to a spinal support rod only perpendicularly.
  • Based upon the foregoing disclosure, it should now be apparent that the polyaxial cross connector assembly of the present invention will carry out the objects set forth hereinabove. It is, therefore, to be understood that any variations evident fall within the scope of the claimed invention and thus, the selection of specific component elements can be determined without departing from the spirit of the invention herein disclosed and described.

Claims (20)

1. A connector device for a spinal stabilization apparatus, the device comprising:
at least a first elongated member adapted to engage at least a first spinal stabilizer rod proximal to a first end of the first elongated member,
wherein the first end of the elongated member is adapted to engage the first spinal stabilizer rod up to about 20 degrees from perpendicular to the first spinal stabilizer rod in any direction.
2. The connector device of claim 1, wherein the first end of the first elongated member comprises a hook shape and a first ferrule, and wherein the first ferrule is adapted to be seated within the hook shape of the first elongated member and is further adapted to engage the first spinal stabilizer rod.
3. The connector device of claim 2, wherein the first end of the first elongated member comprises chamfered edges of the hook shape of the first elongated member.
4. The connector device of claim 2, wherein the hook shape of the first end of the first elongated member comprises two opposed tabs separated by a first gap which forms an entrance into a cavity of the hook shape of the first elongated member and wherein the first ferrule has an outside diameter that is greater than the width of the first gap.
5. The connector device of claim 4, wherein the first end of the first elongated member additionally comprises a retainer adapted to maintain the first ferrule in contact with one or more side walls of the hook shape of the first elongated member proximal to the first gap.
6. The connector device of claim 5, wherein the retainer comprises a spring.
7. The connector device of claim 4, additionally comprising a set screw that is adapted to engage the first ferrule through an aperture in the first elongated member.
8. The connector device of claim 4, wherein the first elongated member is adapted to engage a spinal cross connector rod at a second end of first elongated member.
9. The connector device of claim 1, additionally comprising a second elongated member adapted to engage a second spinal stabilizer rod proximal to a first end of the second elongated member.
10. The connector device of claim 9, wherein the first end of the second elongated member comprises a hook shape that is adapted to engage a second ferrule, and wherein the second ferrule is adapted to be seated within the hook shape of the second elongated member and is further adapted to engage the second spinal stabilizer rod.
11. The connector device of claim 10, wherein the hook shape of the second elongated member comprises two opposed tabs separated by a second gap which forms an entrance into a cavity of the hook shape of the second elongated member and wherein the second ferrule has an outside diameter that is greater than the width of the second gap.
12. The connector device of claim 10, wherein the first end of the second elongated member additionally comprises a retainer adapted to maintain the second ferrule in contact with one or more side walls of the hook shape of the second elongated member proximal to the second gap.
13. The connector device of claim 10, wherein the first elongated member is adapted to engage a first end of a spinal cross connector rod at a second end of first elongated member, and wherein the second elongated member is adapted to engage a second end of the spinal cross connector rod at a second end of second elongated member.
14. A method of treating a patient, the method comprising:
attaching at least a first longitudinal spinal stabilizer to the spine of a patient; and
attaching a first elongated member to the spinal stabilizer;
wherein the first spinal stabilizer is engaged to a first end of the first elongated member and further wherein the first end of the first elongated member is adapted to engage the first longitudinal spinal stabilizer up to about 20 degrees from perpendicular to the first longitudinal spinal stabilizer in any direction.
15. The method of claim 14, wherein the first end of the first elongated member comprises a hook shape and a first ferrule adapted to engage the first spinal stabilizer rod, and wherein the first ferrule is adapted to be seated within the hook shape of the first elongated member.
16. The method of claim 15, wherein the hook shape of the first elongated member comprises two opposed tabs separated by a first gap which forms an entrance into a channel of the hook shape of the first elongated member and wherein the first ferrule has an outside diameter that is greater than the first gap.
17. The method of claim 16, wherein the first end of the first elongated member additionally comprises a retainer for maintaining the first ferrule in contact with one or more side walls of the hook shape of the first elongated member proximal to the first gap.
18. The method of claim 15, additionally comprising:
attaching a second longitudinal spinal stabilizer to the spine of a patient; and
attaching a second elongated member to the second spinal stabilizer;
wherein the second spinal stabilizer is engaged to a first end of the second elongated member, and further wherein the first end of the second elongated member is adapted to engage the second longitudinal spinal stabilizer up to about 20 degrees from perpendicular to the second longitudinal spinal stabilizer in any direction, and additionally wherein the first end of the second elongated member comprises a hook shape and a second ferrule adapted to engage the second spinal stabilizer, and wherein the second ferrule is adapted to be seated within the hook shape.
19. The method of claim 18, wherein the hook shape of the second elongated member comprises two opposed tabs separated by a second gap which forms an entrance into a channel of the hook shape of the second elongated member and wherein the ferrule has an outside diameter that is greater than the second gap.
20. The method of claim 19, wherein the first end of the second elongated member additionally comprises a spring for maintaining the ferrule in contact with one or more side walls of the hook shape of the second elongated member proximal to the second gap.
US12/856,235 2007-01-15 2010-08-13 Polyaxial Cross Connector and Methods of Use Thereof Abandoned US20100305612A1 (en)

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US12/856,235 US20100305612A1 (en) 2007-01-15 2010-08-13 Polyaxial Cross Connector and Methods of Use Thereof

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100094346A1 (en) * 2008-10-09 2010-04-15 Total Connect Spine, Llc Spinal connection assembly
US20110307012A1 (en) * 2009-03-31 2011-12-15 Mir Hamid R Spinous Process Cross-Link
US20130204302A1 (en) * 2012-02-02 2013-08-08 Warsaw Orthopedic, Inc. Spinal implant system and method
US9289242B2 (en) 2004-04-20 2016-03-22 James L. Chappuis Internal pedicle insulator apparatus and method of use
US9763703B2 (en) 2015-05-05 2017-09-19 Degen Medical, Inc. Cross connectors, kits, and methods
US20170325849A1 (en) * 2016-05-13 2017-11-16 Spineology Inc. Multiple diameter spinal rod clamping mechanism

Families Citing this family (48)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8480712B1 (en) 2004-01-06 2013-07-09 Nuvasive, Inc. System and method for performing spinal fixation
US8114158B2 (en) 2004-08-03 2012-02-14 Kspine, Inc. Facet device and method
US20070225712A1 (en) * 2004-10-20 2007-09-27 Moti Altarac Systems and methods for posterior dynamic stabilization of the spine
US7959655B2 (en) * 2007-03-06 2011-06-14 Warsaw Orthopedic, Inc. Self-aligning attachment devices and methods for attaching an elongated member to a vertebral member
US20090105756A1 (en) 2007-10-23 2009-04-23 Marc Richelsoph Spinal implant
US9474554B2 (en) * 2007-10-23 2016-10-25 Lee A. Strnad Spinal rod cross connector
US9060813B1 (en) 2008-02-29 2015-06-23 Nuvasive, Inc. Surgical fixation system and related methods
US8167908B2 (en) * 2008-08-29 2012-05-01 Zimmer Spine, Inc. Polyaxial transverse connector
US9603629B2 (en) 2008-09-09 2017-03-28 Intelligent Implant Systems Llc Polyaxial screw assembly
US8828058B2 (en) 2008-11-11 2014-09-09 Kspine, Inc. Growth directed vertebral fixation system with distractible connector(s) and apical control
IT1392298B1 (en) * 2008-12-17 2012-02-24 N B R New Biotechnology Res MODULAR VERTEBRAL STABILIZER.
US8998961B1 (en) * 2009-02-26 2015-04-07 Lanx, Inc. Spinal rod connector and methods
US8357182B2 (en) 2009-03-26 2013-01-22 Kspine, Inc. Alignment system with longitudinal support features
US8372120B2 (en) * 2009-05-20 2013-02-12 Spine Wave, Inc. Multi-axial cross connector
US8246657B1 (en) 2009-06-29 2012-08-21 Nuvasive, Inc. Spinal cross connector
US9211144B2 (en) * 2009-09-09 2015-12-15 Globus Medical, Inc. Spine surgery device and method
US9168071B2 (en) 2009-09-15 2015-10-27 K2M, Inc. Growth modulation system
US9198696B1 (en) 2010-05-27 2015-12-01 Nuvasive, Inc. Cross-connector and related methods
US8920471B2 (en) 2010-07-12 2014-12-30 K2M, Inc. Transverse connector
US8491641B2 (en) 2010-09-28 2013-07-23 Spinofix, Inc. Pedicle screws and dynamic adaptors
US20120095511A1 (en) * 2010-10-18 2012-04-19 Raj Nihalani Cross connectors
US9247964B1 (en) 2011-03-01 2016-02-02 Nuasive, Inc. Spinal Cross-connector
US9387013B1 (en) 2011-03-01 2016-07-12 Nuvasive, Inc. Posterior cervical fixation system
BR112013025138A2 (en) 2011-04-07 2019-09-24 Blackstone Medical Inc fastener for spinal cross-connect device
CA2838047A1 (en) 2011-06-03 2012-12-06 Kspine, Inc. Spinal correction system actuators
US9649136B2 (en) * 2011-07-15 2017-05-16 Globus Medical, Inc. Coupling devices and methods of using the same
US9451987B2 (en) 2011-11-16 2016-09-27 K2M, Inc. System and method for spinal correction
US9468468B2 (en) 2011-11-16 2016-10-18 K2M, Inc. Transverse connector for spinal stabilization system
US8920472B2 (en) 2011-11-16 2014-12-30 Kspine, Inc. Spinal correction and secondary stabilization
US9468469B2 (en) 2011-11-16 2016-10-18 K2M, Inc. Transverse coupler adjuster spinal correction systems and methods
WO2014172632A2 (en) 2011-11-16 2014-10-23 Kspine, Inc. Spinal correction and secondary stabilization
US8337532B1 (en) 2011-12-08 2012-12-25 Spine Wave, Inc. Methods for percutaneously extending an existing spinal construct
US8556942B2 (en) 2011-12-30 2013-10-15 Blackstone Medical, Inc. Occipito-cervical fixation assembly and method for constructing same
US8945186B2 (en) 2011-12-30 2015-02-03 Blackstone Medical, Inc. Multi-axial spinal cross connecting device
US9339309B1 (en) 2012-10-11 2016-05-17 Nuvasive, Inc. Systems and methods for inserting cross-connectors
US9072547B2 (en) * 2012-11-06 2015-07-07 Globus Medical, Inc. Polyaxial cross connector
US9468471B2 (en) 2013-09-17 2016-10-18 K2M, Inc. Transverse coupler adjuster spinal correction systems and methods
US9044273B2 (en) 2013-10-07 2015-06-02 Intelligent Implant Systems, Llc Polyaxial plate rod system and surgical procedure
US10321939B2 (en) 2016-05-18 2019-06-18 Medos International Sarl Implant connectors and related methods
US10517647B2 (en) 2016-05-18 2019-12-31 Medos International Sarl Implant connectors and related methods
US10398476B2 (en) 2016-12-13 2019-09-03 Medos International Sàrl Implant adapters and related methods
US10492835B2 (en) 2016-12-19 2019-12-03 Medos International Sàrl Offset rods, offset rod connectors, and related methods
US10238432B2 (en) 2017-02-10 2019-03-26 Medos International Sàrl Tandem rod connectors and related methods
US10561454B2 (en) 2017-03-28 2020-02-18 Medos International Sarl Articulating implant connectors and related methods
US10966761B2 (en) 2017-03-28 2021-04-06 Medos International Sarl Articulating implant connectors and related methods
US11076890B2 (en) 2017-12-01 2021-08-03 Medos International Sàrl Rod-to-rod connectors having robust rod closure mechanisms and related methods
EP3563784B1 (en) 2018-05-03 2022-02-16 K2M, Inc. Head to head transverse connector
US11331125B1 (en) 2021-10-07 2022-05-17 Ortho Inventions, Llc Low profile rod-to-rod coupler

Citations (66)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5207678A (en) * 1989-07-20 1993-05-04 Prufer Pedicle screw and receiver member therefore
US5312405A (en) * 1992-07-06 1994-05-17 Zimmer, Inc. Spinal rod coupler
US5360431A (en) * 1990-04-26 1994-11-01 Cross Medical Products Transpedicular screw system and method of use
US5466237A (en) * 1993-11-19 1995-11-14 Cross Medical Products, Inc. Variable locking stabilizer anchor seat and screw
US5496321A (en) * 1993-11-19 1996-03-05 Cross Medical Products, Inc. Rod anchor seat having a sliding interlocking rod connector
US5536268A (en) * 1992-12-23 1996-07-16 Plus Endoprothetik Ag System for osteosynthesis at the vertebral column, connecting element for such a system and tool for its placement and removal
US5647873A (en) * 1995-04-13 1997-07-15 Fastenetix, L.L.C. Bicentric polyaxial locking screw and coupling element
US5669911A (en) * 1995-04-13 1997-09-23 Fastenetix, L.L.C. Polyaxial pedicle screw
US5733285A (en) * 1995-07-13 1998-03-31 Fastenetix, Llc Polyaxial locking mechanism
US5733286A (en) * 1997-02-12 1998-03-31 Third Millennium Engineering, Llc Rod securing polyaxial locking screw and coupling element assembly
US5782833A (en) * 1996-12-20 1998-07-21 Haider; Thomas T. Pedicle screw system for osteosynthesis
US5797911A (en) * 1996-09-24 1998-08-25 Sdgi Holdings, Inc. Multi-axial bone screw assembly
US5879350A (en) * 1996-09-24 1999-03-09 Sdgi Holdings, Inc. Multi-axial bone screw assembly
US5885286A (en) * 1996-09-24 1999-03-23 Sdgi Holdings, Inc. Multi-axial bone screw assembly
US5910142A (en) * 1998-10-19 1999-06-08 Bones Consulting, Llc Polyaxial pedicle screw having a rod clamping split ferrule coupling element
US5947967A (en) * 1997-10-22 1999-09-07 Sdgt Holdings, Inc. Variable angle connector
US5964760A (en) * 1996-10-18 1999-10-12 Spinal Innovations Spinal implant fixation assembly
US6083226A (en) * 1998-04-22 2000-07-04 Fiz; Daniel Bone fixation device and transverse linking bridge
US6113601A (en) * 1998-06-12 2000-09-05 Bones Consulting, Llc Polyaxial pedicle screw having a loosely coupled locking cap
US6287311B1 (en) * 1996-11-07 2001-09-11 Sdgi Holdings, Inc. Multi-angle bone screw assembly using shape-memory technology
US20010023350A1 (en) * 2000-03-15 2001-09-20 Gil-Woon Choi Spine supporting system
US20020010467A1 (en) * 2000-07-22 2002-01-24 Corin Spinal Systems Limited Pedicle attachment assembly
US20020035366A1 (en) * 2000-09-18 2002-03-21 Reto Walder Pedicle screw for intervertebral support elements
US6402749B1 (en) * 1999-04-21 2002-06-11 Sdgi Holdings, Inc. Variable angle connection assembly for a spinal implant system
US6409434B1 (en) * 1999-02-01 2002-06-25 Rensselaer Polytechnic Institute Device for manipulation of objects on a pneumatic surface
US20020151900A1 (en) * 2001-01-12 2002-10-17 Craig Glascott Polyaxial screw with improved locking
US20030028192A1 (en) * 2000-01-13 2003-02-06 Manuel Schar Device for releasably clamping a longitudinal member within a surgical implant
US20030032957A1 (en) * 2001-08-13 2003-02-13 Mckinley Laurence M. Vertebral alignment and fixation assembly
US6540748B2 (en) * 1999-09-27 2003-04-01 Blackstone Medical, Inc. Surgical screw system and method of use
US20030199873A1 (en) * 2002-04-18 2003-10-23 Marc Richelsoph Screw and rod fixation assembly and device
US6709434B1 (en) * 1998-07-30 2004-03-23 Sofamor S.N.C. Spinal osteosynthesis device
US6716214B1 (en) * 2003-06-18 2004-04-06 Roger P. Jackson Polyaxial bone screw with spline capture connection
US6733502B2 (en) * 2002-05-15 2004-05-11 Cross Medical Products, Inc. Variable locking spinal screw having a knurled collar
US20040097933A1 (en) * 2002-11-19 2004-05-20 Rodolphe Lourdel Vertebral anchoring device and its blocking device on a polyaxial screw
US6755830B2 (en) * 2001-07-04 2004-06-29 Sofamor S.N.C. Connector for a spinal fixation member
US20040133203A1 (en) * 2002-10-28 2004-07-08 Young J Stewart Multi-axial, cross-link connector system for spinal implants
US20040158247A1 (en) * 2003-02-07 2004-08-12 Arthit Sitiso Polyaxial pedicle screw system
US20040215190A1 (en) * 2003-04-25 2004-10-28 Nguyen Thanh V. System and method for minimally invasive posterior fixation
US20040236330A1 (en) * 2003-05-22 2004-11-25 Thomas Purcell Variable angle spinal screw assembly
US20040267264A1 (en) * 2003-06-27 2004-12-30 Konieczynski David D. Polyaxial bone screw
US20050038430A1 (en) * 2003-08-11 2005-02-17 Mckinley Laurence M. Low profile vertebral alignment and fixation assembly
US20050049588A1 (en) * 2003-08-28 2005-03-03 Jackson Roger P. Polyaxial bone screw with split retainer ring
US20050055026A1 (en) * 2002-10-02 2005-03-10 Biedermann Motech Gmbh Bone anchoring element
US20050080415A1 (en) * 2003-10-14 2005-04-14 Keyer Thomas R. Polyaxial bone anchor and method of spinal fixation
US20050090821A1 (en) * 2003-10-22 2005-04-28 Gregory Berrevoets Crosslink for securing spinal rods
US20050187548A1 (en) * 2004-01-13 2005-08-25 Butler Michael S. Pedicle screw constructs for spine fixation systems
US20050192573A1 (en) * 2004-02-27 2005-09-01 Custom Spine, Inc. Biased angle polyaxial pedicle screw assembly
US20050192572A1 (en) * 2004-02-27 2005-09-01 Custom Spine, Inc. Medialised rod pedicle screw assembly
US20050192571A1 (en) * 2004-02-27 2005-09-01 Custom Spine, Inc. Polyaxial pedicle screw assembly
US20050261687A1 (en) * 2004-04-20 2005-11-24 Laszlo Garamszegi Pedicle screw assembly
US6974460B2 (en) * 2001-09-14 2005-12-13 Stryker Spine Biased angulation bone fixation assembly
US20060032242A1 (en) * 2003-01-27 2006-02-16 Tegrotenhuis Ward E Methods for fluid separations, and devices capable of separating fluids
US20060036252A1 (en) * 2004-08-12 2006-02-16 Baynham Bret O Polyaxial screw
US20060036244A1 (en) * 2003-10-21 2006-02-16 Innovative Spinal Technologies Implant assembly and method for use in an internal structure stabilization system
US20060036242A1 (en) * 2004-08-10 2006-02-16 Nilsson C M Screw and rod fixation system
US20060058787A1 (en) * 2004-08-24 2006-03-16 Stryker Spine Spinal implant assembly
US20060058880A1 (en) * 2004-08-25 2006-03-16 Steve Wysocki Expandable interbody fusion device
US20060058788A1 (en) * 2004-08-27 2006-03-16 Hammer Michael A Multi-axial connection system
US20060084996A1 (en) * 1992-03-02 2006-04-20 Stryker Trauma Gmbh Apparatus for bracing vertebrae
USRE39089E1 (en) * 1995-04-13 2006-05-02 Fastenetix, Llc Polyaxial pedicle screw having a threaded and tapered compression locking mechanism
US20060100622A1 (en) * 2004-11-10 2006-05-11 Jackson Roger P Polyaxial bone screw with helically wound capture connection
US20060149241A1 (en) * 2002-04-18 2006-07-06 Marc Richelsoph Screw and rod fixation assembly and device
US20060149372A1 (en) * 2004-12-17 2006-07-06 Paxson Robert D Artificial spinal disc
US20060155278A1 (en) * 2004-10-25 2006-07-13 Alphaspine, Inc. Pedicle screw systems and methods of assembling/installing the same
US20060247626A1 (en) * 2005-04-29 2006-11-02 Sdgi Holdings, Inc. Device for interconnecting components in spinal instrumentation
US20070233066A1 (en) * 2006-02-17 2007-10-04 Sdgi Holdings, Inc. Dorsal adjusting spinal connector assembly

Patent Citations (77)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5207678A (en) * 1989-07-20 1993-05-04 Prufer Pedicle screw and receiver member therefore
US5360431A (en) * 1990-04-26 1994-11-01 Cross Medical Products Transpedicular screw system and method of use
US5474555A (en) * 1990-04-26 1995-12-12 Cross Medical Products Spinal implant system
US5624442A (en) * 1990-04-26 1997-04-29 Cross Medical Products, Inc. Transverse link for use with a spinal implant system
US20060084996A1 (en) * 1992-03-02 2006-04-20 Stryker Trauma Gmbh Apparatus for bracing vertebrae
US5312405A (en) * 1992-07-06 1994-05-17 Zimmer, Inc. Spinal rod coupler
US5536268A (en) * 1992-12-23 1996-07-16 Plus Endoprothetik Ag System for osteosynthesis at the vertebral column, connecting element for such a system and tool for its placement and removal
US5466237A (en) * 1993-11-19 1995-11-14 Cross Medical Products, Inc. Variable locking stabilizer anchor seat and screw
US5496321A (en) * 1993-11-19 1996-03-05 Cross Medical Products, Inc. Rod anchor seat having a sliding interlocking rod connector
US5690630A (en) * 1995-04-13 1997-11-25 Fastenetix, Llc Polyaxial pedicle screw
USRE39089E1 (en) * 1995-04-13 2006-05-02 Fastenetix, Llc Polyaxial pedicle screw having a threaded and tapered compression locking mechanism
US5647873A (en) * 1995-04-13 1997-07-15 Fastenetix, L.L.C. Bicentric polyaxial locking screw and coupling element
US5669911A (en) * 1995-04-13 1997-09-23 Fastenetix, L.L.C. Polyaxial pedicle screw
US5733285A (en) * 1995-07-13 1998-03-31 Fastenetix, Llc Polyaxial locking mechanism
US6053917A (en) * 1996-09-24 2000-04-25 Sdgi Holdings, Inc. Multi-axial bone screw assembly
US5797911A (en) * 1996-09-24 1998-08-25 Sdgi Holdings, Inc. Multi-axial bone screw assembly
US5879350A (en) * 1996-09-24 1999-03-09 Sdgi Holdings, Inc. Multi-axial bone screw assembly
US5885286A (en) * 1996-09-24 1999-03-23 Sdgi Holdings, Inc. Multi-axial bone screw assembly
US5964760A (en) * 1996-10-18 1999-10-12 Spinal Innovations Spinal implant fixation assembly
US6287311B1 (en) * 1996-11-07 2001-09-11 Sdgi Holdings, Inc. Multi-angle bone screw assembly using shape-memory technology
US6565567B1 (en) * 1996-12-20 2003-05-20 Thomas T. Haider Pedicle screw for osteosynthesis
US5782833A (en) * 1996-12-20 1998-07-21 Haider; Thomas T. Pedicle screw system for osteosynthesis
US6485494B1 (en) * 1996-12-20 2002-11-26 Thomas T. Haider Pedicle screw system for osteosynthesis
US5733286A (en) * 1997-02-12 1998-03-31 Third Millennium Engineering, Llc Rod securing polyaxial locking screw and coupling element assembly
US5947967A (en) * 1997-10-22 1999-09-07 Sdgt Holdings, Inc. Variable angle connector
US6083226A (en) * 1998-04-22 2000-07-04 Fiz; Daniel Bone fixation device and transverse linking bridge
US6113601A (en) * 1998-06-12 2000-09-05 Bones Consulting, Llc Polyaxial pedicle screw having a loosely coupled locking cap
US6709434B1 (en) * 1998-07-30 2004-03-23 Sofamor S.N.C. Spinal osteosynthesis device
US5910142A (en) * 1998-10-19 1999-06-08 Bones Consulting, Llc Polyaxial pedicle screw having a rod clamping split ferrule coupling element
US6409434B1 (en) * 1999-02-01 2002-06-25 Rensselaer Polytechnic Institute Device for manipulation of objects on a pneumatic surface
US6402749B1 (en) * 1999-04-21 2002-06-11 Sdgi Holdings, Inc. Variable angle connection assembly for a spinal implant system
US6540748B2 (en) * 1999-09-27 2003-04-01 Blackstone Medical, Inc. Surgical screw system and method of use
US20030028192A1 (en) * 2000-01-13 2003-02-06 Manuel Schar Device for releasably clamping a longitudinal member within a surgical implant
US20010023350A1 (en) * 2000-03-15 2001-09-20 Gil-Woon Choi Spine supporting system
US20020010467A1 (en) * 2000-07-22 2002-01-24 Corin Spinal Systems Limited Pedicle attachment assembly
US6626908B2 (en) * 2000-07-22 2003-09-30 Corin Spinal Systems Limited Pedicle attachment assembly
US20020035366A1 (en) * 2000-09-18 2002-03-21 Reto Walder Pedicle screw for intervertebral support elements
US6869433B2 (en) * 2001-01-12 2005-03-22 Depuy Acromed, Inc. Polyaxial screw with improved locking
US20040249380A1 (en) * 2001-01-12 2004-12-09 Craig Glascott Polyaxial screw with improved locking
US20020151900A1 (en) * 2001-01-12 2002-10-17 Craig Glascott Polyaxial screw with improved locking
US6755830B2 (en) * 2001-07-04 2004-06-29 Sofamor S.N.C. Connector for a spinal fixation member
US20030032957A1 (en) * 2001-08-13 2003-02-13 Mckinley Laurence M. Vertebral alignment and fixation assembly
US6974460B2 (en) * 2001-09-14 2005-12-13 Stryker Spine Biased angulation bone fixation assembly
US6740086B2 (en) * 2002-04-18 2004-05-25 Spinal Innovations, Llc Screw and rod fixation assembly and device
US20060149241A1 (en) * 2002-04-18 2006-07-06 Marc Richelsoph Screw and rod fixation assembly and device
US20030199873A1 (en) * 2002-04-18 2003-10-23 Marc Richelsoph Screw and rod fixation assembly and device
US20040193160A1 (en) * 2002-04-18 2004-09-30 Marc Richelsoph Screw and rod fixation asembly and device
US6733502B2 (en) * 2002-05-15 2004-05-11 Cross Medical Products, Inc. Variable locking spinal screw having a knurled collar
US20050055026A1 (en) * 2002-10-02 2005-03-10 Biedermann Motech Gmbh Bone anchoring element
US20040133203A1 (en) * 2002-10-28 2004-07-08 Young J Stewart Multi-axial, cross-link connector system for spinal implants
US20040097933A1 (en) * 2002-11-19 2004-05-20 Rodolphe Lourdel Vertebral anchoring device and its blocking device on a polyaxial screw
US20060032242A1 (en) * 2003-01-27 2006-02-16 Tegrotenhuis Ward E Methods for fluid separations, and devices capable of separating fluids
US20040158247A1 (en) * 2003-02-07 2004-08-12 Arthit Sitiso Polyaxial pedicle screw system
US20040215190A1 (en) * 2003-04-25 2004-10-28 Nguyen Thanh V. System and method for minimally invasive posterior fixation
US20040236330A1 (en) * 2003-05-22 2004-11-25 Thomas Purcell Variable angle spinal screw assembly
US6716214B1 (en) * 2003-06-18 2004-04-06 Roger P. Jackson Polyaxial bone screw with spline capture connection
US20040267264A1 (en) * 2003-06-27 2004-12-30 Konieczynski David D. Polyaxial bone screw
US20050038430A1 (en) * 2003-08-11 2005-02-17 Mckinley Laurence M. Low profile vertebral alignment and fixation assembly
US20050049588A1 (en) * 2003-08-28 2005-03-03 Jackson Roger P. Polyaxial bone screw with split retainer ring
US20050080415A1 (en) * 2003-10-14 2005-04-14 Keyer Thomas R. Polyaxial bone anchor and method of spinal fixation
US20060036244A1 (en) * 2003-10-21 2006-02-16 Innovative Spinal Technologies Implant assembly and method for use in an internal structure stabilization system
US20050090821A1 (en) * 2003-10-22 2005-04-28 Gregory Berrevoets Crosslink for securing spinal rods
US20050187548A1 (en) * 2004-01-13 2005-08-25 Butler Michael S. Pedicle screw constructs for spine fixation systems
US20050192573A1 (en) * 2004-02-27 2005-09-01 Custom Spine, Inc. Biased angle polyaxial pedicle screw assembly
US20050192571A1 (en) * 2004-02-27 2005-09-01 Custom Spine, Inc. Polyaxial pedicle screw assembly
US20050192572A1 (en) * 2004-02-27 2005-09-01 Custom Spine, Inc. Medialised rod pedicle screw assembly
US20050261687A1 (en) * 2004-04-20 2005-11-24 Laszlo Garamszegi Pedicle screw assembly
US20060036242A1 (en) * 2004-08-10 2006-02-16 Nilsson C M Screw and rod fixation system
US20060036252A1 (en) * 2004-08-12 2006-02-16 Baynham Bret O Polyaxial screw
US20060058787A1 (en) * 2004-08-24 2006-03-16 Stryker Spine Spinal implant assembly
US20060058880A1 (en) * 2004-08-25 2006-03-16 Steve Wysocki Expandable interbody fusion device
US20060058788A1 (en) * 2004-08-27 2006-03-16 Hammer Michael A Multi-axial connection system
US20060155278A1 (en) * 2004-10-25 2006-07-13 Alphaspine, Inc. Pedicle screw systems and methods of assembling/installing the same
US20060100622A1 (en) * 2004-11-10 2006-05-11 Jackson Roger P Polyaxial bone screw with helically wound capture connection
US20060149372A1 (en) * 2004-12-17 2006-07-06 Paxson Robert D Artificial spinal disc
US20060247626A1 (en) * 2005-04-29 2006-11-02 Sdgi Holdings, Inc. Device for interconnecting components in spinal instrumentation
US20070233066A1 (en) * 2006-02-17 2007-10-04 Sdgi Holdings, Inc. Dorsal adjusting spinal connector assembly

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9289242B2 (en) 2004-04-20 2016-03-22 James L. Chappuis Internal pedicle insulator apparatus and method of use
US20100094346A1 (en) * 2008-10-09 2010-04-15 Total Connect Spine, Llc Spinal connection assembly
US8951289B2 (en) * 2008-10-09 2015-02-10 Total Connect Spine, Llc Spinal connection assembly
US20110307012A1 (en) * 2009-03-31 2011-12-15 Mir Hamid R Spinous Process Cross-Link
US9095380B2 (en) * 2009-03-31 2015-08-04 Hamid R. Mir Spinous process cross-link
US20130204302A1 (en) * 2012-02-02 2013-08-08 Warsaw Orthopedic, Inc. Spinal implant system and method
US9763703B2 (en) 2015-05-05 2017-09-19 Degen Medical, Inc. Cross connectors, kits, and methods
US20170325849A1 (en) * 2016-05-13 2017-11-16 Spineology Inc. Multiple diameter spinal rod clamping mechanism

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