WO2010144309A1 - Interspinous implant and methods of use - Google Patents
Interspinous implant and methods of use Download PDFInfo
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- WO2010144309A1 WO2010144309A1 PCT/US2010/037353 US2010037353W WO2010144309A1 WO 2010144309 A1 WO2010144309 A1 WO 2010144309A1 US 2010037353 W US2010037353 W US 2010037353W WO 2010144309 A1 WO2010144309 A1 WO 2010144309A1
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- WIPO (PCT)
- Prior art keywords
- wing
- implant
- wings
- orientation
- spinous process
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical 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
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7062—Devices acting on, attached to, or simulating the effect of, vertebral processes, vertebral facets or ribs ; Tools for such devices
- A61B17/7065—Devices with changeable shape, e.g. collapsible or having retractable arms to aid implantation; Tools therefor
Definitions
- the invention relates generally to the treatment of spinal conditions, and more particularly, to the treatment of spinal conditions using an implant configured for insertion into an interspinous space.
- the implant is adjustable between a closed orientation with a reduced size to facilitate insertion into the patient and a deployed orientation with an enlarged size to maintain the position within the patient.
- a significant portion of the population will experience back pain at some point in their lives resulting from a spinal condition.
- the pain may range from general discomfort to disabling pain that immobilizes the individual.
- Back pain may result from a trauma to the spine, be caused by the natural aging process, or may be the result of a degenerative disease or condition.
- Procedures to remedy back problems sometimes require correcting the distance between vertebral members by inserting an interspinous device (e.g., spacer) between spinous processes.
- an interspinous device e.g., spacer
- implants are positioned between the spinous processes of the L5 and Sl vertebral members.
- current implants often cannot be used in this space because of the huge variations in the sacral anatomy and the lack of an Sl spinous process in about 70% of the population.
- interspinous implant often requires extensive surgical techniques. These implants often require an open technique to be implanted, and many require destroying important anatomical stabilizers, such as the supraspinous ligament. In particular, some techniques for placing such implants is to cut the interspinous and supraspinous ligaments and slide the device over the adjacent spinous processes.
- the present application is directed to implants for insertion into an interspinous space.
- the implants may be used in the interspinous space formed between the L5 spinous process and a sacrum, and in interspinous spaces formed between spinous processes at various other spinal levels.
- the implant includes a body with a first side that faces towards the first spinous process and a second side that faces towards the second spinous process.
- the body may include a compliant material that contacts against one or both of the spinous processes when the body is positioned in the interspinous space.
- the implant further includes a first wing positioned in proximity to the leading end and away from the trailing end.
- the first wing may be movably connected to the body and selectively positionable from a closed orientation positioned at the first side of the body to a deployed orientation extending outward above the first side of the body.
- the implant may further include a second wing positioned in proximity to the trailing end and away from the leading end. The second wing may extend outward above the first side of the body when the first wing is in the deployed orientation.
- the implant may also include a deploying mechanism operatively connected to at least the first wing, and may also be connected to the second wing.
- the deploying mechanism may move one or both of the wings from the closed orientation to the deployed orientation.
- the deploying mechanism may also move one or both wings to reduce a distance between the wings and into contact with the spinous process.
- Each of the first and second wings may be positioned above a second side of the body when the first wing is in the deployed orientation.
- Figure 1 is a perspective view of an implant in a deployed orientation according to one embodiment.
- Figure 2 is an exploded perspective view of an implant according to one embodiment.
- Figure 3 is a perspective view of an implant in a closed orientation according to one embodiment.
- Figure 4A is a front view of an implant in a closed orientation according to one embodiment.
- Figure 4B is a front view of an implant in a deployed orientation according to one embodiment.
- Figure 5 A is a side view of an implant in a closed orientation inserted within a patient according to one embodiment.
- Figure 5B is a side view of an implant in a partially deployed orientation inserted within a patient according to one embodiment.
- Figure 5 C is a side view of an implant in a deployed orientation inserted within a patient according to one embodiment.
- Figure 6 is a perspective view of an implant in a deployed orientation according to one embodiment.
- Figure 7 is a perspective view of a body of an implant according to one embodiment.
- Figure 8 is a perspective view of an implant in a closed orientation according to one embodiment.
- Figure 9 is a front view of an implant in a closed orientation according to one embodiment.
- Figure 10 is a perspective view of an implant in a deployed orientation according to one embodiment.
- Figure 11 is a side view of an implant in a closed orientation according to one embodiment.
- Figure 12 is a side view of an implant in a deployed orientation according to one embodiment.
- Figure 13 is a cross section of an implant in a closed orientation according to one embodiment.
- Figure 14 is a side view of an implant in a closed orientation according to one embodiment.
- Figure 15 is a side view of an implant in an open orientation according to one embodiment.
- Figure 16 is an exploded perspective view of an implant according to one embodiment.
- Figures 17-19 are side schematic views of an implant being implanted into a patient according to one embodiment.
- Figure 20 is a schematic cross section of a body positioned within an interspinous space according to one embodiment.
- Figure 21 is a perspective view of an implant in a closed orientation according to one embodiment.
- the present application is directed to implants for insertion into the interspinous space formed between first and second vertebral members.
- the implants include a main body and a pair of wings that extend outward from the body.
- the implants are sized and configured for the main body to be positioned along a centerline of the spine with the wings on opposing lateral sides of a spinous process of the first vertebral member.
- the body may contact or may be spaced from the second vertebral member .
- the implants may further be selectively adjustable between a collapsed orientation and an extended orientation.
- the collapsed orientation features one or both wings aligned in proximity with the main body to reduce an overall size of the implant to facilitate insertion into the patient.
- the extended orientation includes the wings extending outward from the body for positioning against the first spinous process.
- the implants may include various configurations of bodies and wings. Figures
- the body 20 includes an elongated shape with a first end 21 and a second end 22.
- the body 20 also includes a first section 25 at the first end 21 that may include a tapered shape that facilitates insertion of the implant 10 into the patient.
- the first section 25 may include various cross-sectional shapes. In one embodiment, the first section 25 is not tapered.
- the first end 21 may be substantially flat, or may include a point.
- the body 20 also includes a second section 26.
- the second section 26 is cylindrical, although it may also include various other cross-sectional shapes, including but not limited to elliptical and oblong
- the first section 25 may be sized to increase in cross-sectional size and provide a smooth transition to the second section 26.
- Recesses 23, 24 are positioned in the body 20 to receive the wings 30.
- the recesses 23, 24 are spaced apart by a gap 27 sized to accommodate the first spinous process.
- the illustrated embodiment includes each of the recesses 23, 24 positioned along the second section 26.
- the first recess 23 is positioned at a first end of the second section 26 and is positioned at the transition with the first section 25, and the second recess
- the recesses 23, 24 extends into the second section 26 from the second end 22.
- the recesses 23, 24 may extend completely through the body 20, or may extend a limited depth inward from the superior surface.
- a slot 28 extends through the body 20 between the recesses 23, 24.
- the slot 28 is positioned within an interior of the body 20 under the exterior surface of the gap 27.
- the wings 30 are sized to fit within the recesses 23, 24.
- the wings 30 include a first end 31 and a second end 32.
- One or both ends 31, 32 may include a rounded shape that corresponds to the rounded exterior surface of the body 20.
- the wings 30 may be substantially identical, or may include different shapes, sizes, and features.
- Wings 30 may also include teeth 33 that extend laterally outward from an inner side.
- the teeth 33 are configured to engage with the spinous process of the first vertebral member and may include various shapes and sizes.
- the embodiments of Figures 1-3 include teeth 33 on each of the wings 30, although teeth 33 may be included on just one of the wings 30.
- the teeth 33 may include various shapes other than those illustrated, including but not limited to ridges and knurled sections.
- the teeth 33 on the first wing 30 are offset from the teeth 33 on the second wing 30.
- the offset positioning prevents the teeth from contacting together when the wings 30 are engaged with the spinous process.
- the deployment mechanism 60 moves the wings 30 between the closed orientation as illustrated in Figure 3 and the deployed orientation as illustrated in Figure 1.
- the deployment mechanism 60 may also laterally move the wings 30 relative to each other for attachment to the spinous process of the superior vertebral member.
- Figure 2 illustrates a deployment mechanism 60 that includes a rod 61 and a fastener 62.
- the rod 61 includes an elongated shape with a threaded section 63.
- the rod 61 is attached to the first wing 30 and includes a length to extend through the slot 28 and at least into the opposing recess 24.
- the rod 61 is sized to fit through an aperture 34 in the second wing 30 with the threaded section 63 at least partially extending outward from the second wing 30.
- the fastener 62 is threaded onto the threaded section 63.
- Fastener 62 may be a nut that attaches to the rod 61.
- the rod 61 may include one or more weakened sections, including a reduced cross-sectional size.
- the weakened sections are positioned along the section that extends outward beyond the fastener 62.
- the surgeon can apply a force to the appropriate section to reduce the length of the rod 61.
- the weakened sections are positioned such that the rod 61 does not extend outward beyond the body 20.
- Figure 4A includes a front view of the implant 10 in the closed orientation with both wings 30 closed into the body 20.
- the first section 25 includes a tapered shape with a maximum diameter greater than or equal to the diameter of the second section 26. Therefore, the second section 26 is not visible in this front view. This reduced size in the closed orientation facilitates insertion into the patient and adjacent to the spinous process.
- Figure 4B illustrates the implant 10 in the deployed orientation with the wings 30 extending outward beyond the envelope of the body 20.
- Figures 5A-5C illustrate positioning and deployment of the implant 10 within the interspinous space 120 formed between the vertebral members 100, 200.
- the first vertebral member 100 is an L5 vertebral member
- the second vertebral member 200 is a sacrum that does not include a spinous process adequate to support and/or position the implant 10.
- the implant 10 is positioned on the sacral roof of the sacrum.
- the implant 10 includes a reduced size in the closed orientation as illustrated in Figure 5 A that facilitates insertion into the patient.
- the implant 10 may be inserted percutaneously with the use of the proper tools.
- the implant 10 may also be inserted through a mini-open incision that requires unilateral tissue retraction as the wings 30 are both deployed from the ipsilateral side as will be explained below.
- This sequence includes the fastener 62 attached to the rod 61 to connect the wings 30 together prior to insertion into the patient.
- the rod 61 is attached to the wings 30 after insertion of the body 20 and wings 30 into the patient.
- Figure 5 A includes the implant 10 positioned within the patient with the body 20 resting against the roof (i.e., superior edge) of the second vertebral member 200 which in this embodiment is the sacrum. In other embodiments, the body 20 does not contact the second vertebral member 200.
- the body 20 may include a height measured between superior and inferior surfaces of the second section 26 for the gap 27 on the first surface to contact the inferior edge of the spinous process of the first vertebral member 100 while the inferior surface contacts against the second vertebral member 200.
- the reduced size of the implant 10 in the closed orientation with the wings 30 positioned within the profile of the body 20 facilitates insertion into the patient.
- the conical first section 25 is shaped to ease the insertion into the space 120.
- the wings 30 are enclosed within the body 20 to allow for smooth dilation and insertion through the interspinous space 120. In some instances, the wings 30 may not completely fit within the recesses 23, 24 resulting in the second ends 32 extending beyond the superior surface of the second section 26.
- Figure 5 A includes the first section 25 including a larger size than the second section 26 (i.e., a larger profile). Thus, even though the second ends 32 extend outward beyond the second section 26, the wings 30 are still positioned within the profile of the first section 25.
- Figure 5B includes the implant 10 in a partially deployed orientation. Deployment occurs with the surgeon applying a force in a superior direction on the fastener 62 which is exposed at the second end 22 of the body 20 through the insertion path. This force causes the fastener 62, rod 61 and attached wings 30 to move upward relative to the body 20 and the rod 61 to move along the slot 28 in the body 20.
- the length of the rod 61 causes the wings 30 to be spaced apart a distance to extend outward from the body 20 along each lateral side of the spinous process 100. This spacing allows for the deploying movement without the wings 30 contacting against the spinous process 100.
- the extent of deployment of the wings 30 from the body 20 may vary depending upon the context of use. Full deployment occurs when the rod 61 contacts against an upper edge of the slot 28 thereby preventing further deployment movement.
- the body 20 and one or both wings 30 include a ratchet structure. This may include a stepped or wedged shape on each of the body 20 and wings 30.
- the wings 30 move outward from the body 20 and along the ratchet structure.
- the wings 30 deploy in a stepped process and may be positioned at the various steps to extend outward from the body 30 the desired amount.
- the fastener 62 is further threaded onto the threaded section 63 of the rod 61.
- the threading causes the fastener 62 to move along the length of the rod 61 and force the wings 30 together. This may include movement of both wings 30 relative to the body 20, or movement of just one wing 30 with the other wing remaining stationary relative to the body 20. In one embodiment, just the proximal wing 30 moves with the distal wing 30 remaining stationary. This movement results in the teeth 33 contacting with the spinous process 100 to attach the implant 10.
- the extent of inward movement of the wings 30 may vary depending upon the context. As illustrated in Figure
- the fastener 62 may move along the rod 61 and beyond the second end 22 of the body 20 and into the recess 24. This portion of the rod 61 may be removed by the surgeon once the implant 10 is properly positioned in the patient.
- the implant 10 may also include one or more pins to maintain the position of the wings 30. Apertures in the wings 30 and body 20 are sized to receive the pins to secure the relative positions. In one embodiment, a wedge is inserted into the slot 28 after the wings 30 are deployed. The wedge prevents the rod 61 from moving within the slot 28 and possibly causing the wings 20 to retract.
- both wings 30 are retracted in to the body 30 with the implant 10 in the closed orientation.
- just the first or leading wing 30 adjacent to the first section 25 retracts into the body 20.
- the second or trailing wing 30 adjacent to the second end 22 may not retract into the body 20 because this second wing 30 does not pass through the interspinous space 120 during the implantation process.
- Figures 6-9 include an implant 10 with the body 20 movable relative to the wings 30.
- the body 20 includes an oval cross-sectional shape with first and second apertures 51, 52 that are each offset from a longitudinal axis C.
- Body 20 may also include other cross-sectional shapes, including but not limited to circular, elliptical, and rectangular.
- the first or leading wing 30 includes a tapered shape that extends between a reduced first end 21 and an enlarged second end 37.
- the second end 37 includes a cross- sectional shape that is larger than or equal to the body 20.
- teeth 33 extend outward from a small area of the second end 37 and face towards the second or trailing wing 30.
- the second wing 30 includes an elongated cross-sectional shape that may be the same as the second end 37. Teeth 33 also extend outward from a small area and face towards the first wing 30. The teeth 33 are aligned on the wings 30 to fit within the aperture 52 of the body 20 when the implant 10 is in the closed orientation.
- the deploying mechanism 60 includes a rod 61 that is connected to the first wing 30 and extends through the body 20 and second wing 30.
- a fastener 62 is threaded onto a threaded section 63 at the end of the rod 61.
- the implant 10 is inserted into the patient in the closed orientation as illustrated in Figure 8.
- the body 20 is aligned with the wings 30 and positioned within the profile of at least the first wing 30. This orientation places the teeth 33 on the wings 30 within the aperture 52, with the rod 61 extending through the aperture 51 of the body 20 and the second wing 30.
- Figure 9 illustrates a front view of the implant 10 in the closed orientation with the body 20 and second wing 30 within the profile of the first wing 30.
- the implant 10 is inserted with the first wing 30 moving through the space 120 and aligning along a first lateral side of the spinous process of the first vertebral member 100, the second wing 30 on a second lateral side of the spinous process, and the body 20 aligning within the space 120.
- the wings 30 are rotated relative to the body 30 with the first wing 30 rotating along a first lateral side of the spinous process 100 and the second wing 30 rotating along a second lateral side.
- This rotation causes the body 20 to move out of the profile of the wings 30.
- the rotation may be caused by the surgeon manipulating the rod 61 and applying the rotational force.
- the fastener 62 is threaded along the rod 61 and moving the wings 30 towards each other.
- the teeth 33 may move into contact with the spinous process of the first vertebral member 100 to maintain the position of the implant 10.
- Figure 21 includes an embodiment with the trailing wing 30 including a greater length than the body 20. This length may extend outward from a single side of the body 20 when the implant 10 is in the closed orientation, or may extend outward on opposing sides of the body 20.
- Figure 21 includes the wing 30 extending outward from both sides.
- the trailing wing 30 is not moved into or through the interspinous space 120 and therefore may be longer than the body 20 and/or first wing 30.
- the increased length of the trailing wing 30 facilitates placement of the implant 10 within the interspinous space 120.
- the one or both of the wings 30 may not include teeth 33.
- Figure 10 includes the body 20 with a pair of recesses 58 sized to receive the teeth 33.
- the recesses 58 extend into the body 20 from an outer edge. In a closed orientation, the body 20 is aligned with the wings 30 (similar to the configuration of Figure 8) with the teeth 33 positioned in the recesses 58. Deployment includes the relative movement between the body 20 and wings 30 about the rod 61 such that the wings 30 extend outward with the teeth 33 exposed to engage with the superior spinous process.
- Figures 11-13 include an implant 10 with a pair of wings 30 that deploy to an open orientation by axial compression of the implant 10.
- the wings 30 are each positioned on the same side of the implant 10 and are configured to engage with opposing sides of the spinous process of the first vertebral member 100 during deployment.
- One or both wings 30 may include teeth 33 on an inner surface to facilitate the engagement with the spinous process.
- the implant 10 includes a distal section 40, intermediate section 41, and a proximal section 42 aligned along a longitudinal axis C.
- the distal section 40 includes a first end 43 and a second end 44
- the proximal section 42 includes a first end 45 and a second end 46.
- the intermediate section 41 is coupled between second end 44 and first end 45.
- the wings 30 are positioned along the superior surface with the distal wing 30 straddling between the distal and intermediate sections 40, 41, and the proximal wing 30 straddling between the proximal and intermediate sections 42, 43.
- the sections 40, 41, 42 are sized to allow relative axial movement.
- the intermediate section 41 is sized to fit within the interior of the distal and proximal sections 40, 42.
- the implant 10 is configured to be deformed under the influence of an axial load that causes relative axial movement between the distal and intermediate sections 40, 41, and between the intermediate and proximal sections 41, 42.
- the deformation causes the wings 30 to deploy outward away from the sections to be positioned on the lateral sides of the spinous process.
- Figure 13 includes a similar embodiment with the implant 10 including an exterior sleeve 39 that fits over an interior member 38.
- the exterior sleeve 39 further includes a pair of wings 30.
- the interior member 38 is connected to a distal section of the exterior sleeve 39.
- the interior member 38 may be forced in a proximal direction with the force causing the distal section of the exterior sleeve 39 to also move in the proximal direction.
- the exterior sleeve 39 may include one or more gaps opposite from the wings 30 to allow the distal section to move and the wings 30 to deploy.
- the implant 10 is positioned in the closed orientation as illustrated in
- the wings 30 may include a slight fold while in the closed orientation to facilitate deployment.
- the implant 10 is inserted into the interspinous space 120 with the distal wing 30 moved past the spinous process of the first vertebral member 100.
- an axial load is applied to the implant 10 causing the wings 30 to deploy away from the longitudinal axis C of the implant 10 as illustrated in Figure 12.
- the axial load deploys the wings 30 and moves the wings 30 along the lateral sides of the spinous process 100.
- the movement of the wings 30 towards each other is caused by the compression of the intermediate section 41.
- the movement of the wings 30 in the embodiment of Figure 13 is caused by the compression of the exterior sleeve 39.
- Implant 10 includes a proximal section 42 and telescoping sections 80-83 positioned along the longitudinal axis C and form the body 20.
- section 81 fits within one or both of sections 80 and 82, and section 83 fits within section 82.
- the first section 80 includes a tapered shape with a pointed first end 21 to facilitate insertion into the patient.
- Wings 30 are positioned on the superior side of the body 20 and each include a pair of links 71, 72 connected together at a pivot 90.
- the links 71, 72 are further pivotally connected to the body 20 with at additional pivots 90.
- the links 71 may further include teeth 33 to engage with the spinous process of the first vertebral member 100.
- the implant 10 is inserted into the patient in the closed orientation as illustrated in Figure 14.
- the shape of the body 20 and the tapered first section 80 facilitates the insertion.
- the implant is inserted an amount with the section 82 approximately aligned in the space 120. In the closed orientation, the links 71, 72 are aligned in a straight line.
- section 81 moves into one or both of sections 80 and 82, and section 83 moves into section 82.
- the sections 80, 82 may move completely into the other sections as illustrated in Figure 15, or move partly into the other sections.
- the wings 30 are attached to different sections to cause deployment.
- the first wing 30 includes the first link 71 connected to section 82 and the second link 72 connected to section 80.
- the second wing 30 includes the first link 71 connected to section 82 and the second link 72 connected to the proximal section 41.
- the wings 30 deploy outward away from the main body 20 as the sections 80-83 telescope together.
- the height the wings 30 extend outward from the superior side of the body 20 depends upon the length of the links 71, 72, and the amount of telescoping of the different sections.
- the links 71, 72 form an acute angle.
- FIGS 16-19 illustrate a deployable implant 10 configured to be positioned in the interspinous space 120.
- implant 10 includes a first section 210 and a second section 250.
- the first section 210 includes a first wing 201 with an extension 202 extending outward in a proximal direction.
- First wing 201 may be tapered to facilitate insertion into the interspinous space, and may include a variety of cross- sectional shapes and sizes.
- the second section 250 includes a body 251 with a second wing 252 extending outward from one side. The shapes and sizes of the body 251 and second wing 252 may vary depending upon the use.
- a slot 254 extends through the second section 250 and includes an elongated shape.
- the first section may be initially inserted into the patient as illustrated in Figure 17.
- the wing 201 is moved through the interspinous space with the extension 202 extending within the interspinous space.
- the second section 250 is inserted into the patient with the extension 202 extending through the slot 254. This positions the body 251 in the interspinous space 120 and between the spinous processes of the first and second vertebral members 100, 200, with the wings 201, 252 on opposing lateral sides of the interspinous space 120.
- Another insertion method may include attaching second section 250 to the first section 210 prior to fully inserting the first section 210.
- the wing 201 may be positioned between the spinous processes, or even on a near side of the spinous processes when the sections 210, 250 are connected together.
- the sections 210, 250 are connected together prior to insertion into the patient.
- the second section 250 may be translated in an inferior-superior plane. This may occur by relative movement of the extension 202 within the slot 254. This movement results in the wing 201 now extending upward beyond the body 251 to extend along a lateral side of the spinous process.
- the fastener 253 is attached to the extension 202 to secure the sections 210, 250 together. Connection of the fastener 253 may also move the sections 210, 250 together and into engagement with the spinous process. This engagement also secures the relative positions of the sections 210, 250. Teeth may be positioned on the inner surface of one or both wings 201, 252 to facilitate the contact. In the event the wings 201, 252 do not secure the relative positions of the sections 210, 250, a plug may be inserted into the slot 254 to prevent the extension 202 from translating in the inferior-superior plane.
- the embodiments of Figures 16-19 include the wing 252 extending outward from one side of the body 251.
- the wing 252 may also extend outward from the opposing side of the body 251. Further, wing 252 may include various lengths to facilitate placement of the implant 10 in the interspinous space 120.
- Figures 16-19 include deployment of the leading wing by moving the extension 202 along the slot 254.
- Another deployment structure includes the extension 202 attached to the wing 201 at a point offset from a longitudinal center line of the wing 201.
- the extension 202 extends through an aperture in the second section 250.
- the aperture may be offset from a longitudinal center line of the second section, is sized for rotation of the extension 202, and may or may not provide for sliding movement.
- Deployment includes rotation of the extension 202 by the surgeon which in turn causes the wing 201 to rotate.
- the offset positioning of the extension 202 results in the wing 201 extending outward beyond the surface of the body 251 to be positioned along a lateral side of the spinous process.
- the first section 210 includes a recess sized to receive the leading end of the body 251. Attachment of the first and second sections 210, 250 includes the leading end of the body 251 being inserted into the recess.
- the body 20 may be wrapped in cushioning outer sleeve or coated with a compliant material.
- the body 20 may also be comprised of materials that are closer in stiffness to the first and second vertebral members 100, 200 to prevent subsidence of the implant 10. This is important in embodiments in which the body 20 contacts the sacrum, and especially for contact with the sacrum lamina which are relatively weak. These materials may have a Modulus of Elasticity (MOE) that is particularly matched with the vertebral members 100, 200.
- MOE Modulus of Elasticity
- the difference of the MOE of the material and the vertebral members 10, 200 is not greater than about 30 GPa. In other embodiments, the difference is less, such as not greater than about 15 GPa, not greater than about 5 GPA, or not greater than about 1 GPa.
- compliant material include but are not limited to silicone, polyaryletheretherketone (PEEK), polyeurathane, and rubber.
- Figure 20 includes a schematic side view of the body 20 positioned within the interspinous space 120 with material 290 on the superior and inferior sides illustrated in cross section. The wing has been removed from the implant 10 in
- the body 20 includes a core 295 with material 290 positioned on the superior and inferior sides. Positioning of the material 290 at these sides facilitates placement of the implant 10 as anterior as possible.
- the core 295 may be solid or hollow.
- the material 290 may be placed on one or both of the inferior and superior sides.
- the implants 10 may be implanted within a living patient for the treatment of various spinal disorders.
- the implant 10 may also be implanted in a non-living situation, such as within a cadaver, model, and the like. The non-living situation may be for one or more of testing, training, and demonstration purposes.
- the implant 10 may be positioned in the patient with the wings 30 extending superiorly outward to contact against the spinous process of the superior vertebral member 100.
- the implant 10 may also be positioned in an opposite orientation (i.e., rotated 180 degrees) with the wings 30 extending inferior Iy outward and contacting against a spinous process of the inferior vertebral member 200.
- teeth may be positioned on the wings to engage with spinous processes.
- the teeth may include various shapes, sizes, and placements. In some embodiments, one or both of the wings do not include teeth.
- the wings 30 contact against a spinous process of a first vertebral member 100, and the body 20 contacts against the second vertebral member.
- the implant 10 may also be positioned in the patient with the body 20 spaced away from the second vertebral member such that there is no contact.
- the implant 10 is inserted into the space 120 and contacts against one or more of the first and second vertebral members 100, 200. This contact may include direct contact with these members, and also indirect contact with the implant 10 directly contacting the surrounding ligaments and tissue. In both instances, the implant 10 includes a similar effectiveness for treating the spinal disorder for which it was implanted.
- the implants 10 may be used in the interspinous space 120 formed between the L5 vertebra and sacrum.
- the implants 10 may also be positioned at other locations along the spine for spacing apart the vertebral members. Applications may also place the implant at other regions of the spine, including the cervical, thoracic, and lumbar regions.
- distal is generally defined as in the direction of the patient, or away from a user of a device. Conversely, “proximal” generally means away from the patient, or toward the user.
- Spatially relative terms such as “under”, “below”, “lower”, “over”, “upper”, and the like, are used for ease of description to explain the positioning of one element relative to a second element. These terms are intended to encompass different orientations of the device in addition to different orientations than those depicted in the figures. Further, terms such as “first”, “second”, and the like, are also used to describe various elements, regions, sections, etc and are also not intended to be limiting. Like terms refer to like elements throughout the description.
Abstract
Description
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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EP10728040.6A EP2440143B1 (en) | 2009-06-12 | 2010-06-04 | Interspinous implant |
AU2010259067A AU2010259067A1 (en) | 2009-06-12 | 2010-06-04 | Interspinous implant and methods of use |
CN201080035842.0A CN102802546B (en) | 2009-06-12 | 2010-06-04 | Interspinous implant and methods of use |
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Application Number | Priority Date | Filing Date | Title |
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US12/483,812 | 2009-06-12 | ||
US12/483,812 US8157842B2 (en) | 2009-06-12 | 2009-06-12 | Interspinous implant and methods of use |
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WO2010144309A1 true WO2010144309A1 (en) | 2010-12-16 |
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PCT/US2010/037353 WO2010144309A1 (en) | 2009-06-12 | 2010-06-04 | Interspinous implant and methods of use |
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US (1) | US8157842B2 (en) |
EP (1) | EP2440143B1 (en) |
CN (1) | CN102802546B (en) |
AU (1) | AU2010259067A1 (en) |
WO (1) | WO2010144309A1 (en) |
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Also Published As
Publication number | Publication date |
---|---|
US20100318127A1 (en) | 2010-12-16 |
EP2440143A1 (en) | 2012-04-18 |
AU2010259067A1 (en) | 2012-01-19 |
CN102802546B (en) | 2015-02-04 |
EP2440143B1 (en) | 2015-05-27 |
US8157842B2 (en) | 2012-04-17 |
CN102802546A (en) | 2012-11-28 |
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