WO2002045627A1 - Anterior variable expandable fusion cage - Google Patents
Anterior variable expandable fusion cage Download PDFInfo
- Publication number
- WO2002045627A1 WO2002045627A1 PCT/US2001/041799 US0141799W WO0245627A1 WO 2002045627 A1 WO2002045627 A1 WO 2002045627A1 US 0141799 W US0141799 W US 0141799W WO 0245627 A1 WO0245627 A1 WO 0245627A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- expansion member
- anterior
- expansion
- lower walls
- wedge
- Prior art date
Links
Classifications
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- A61F2/4455—Joints for the spine, e.g. vertebrae, spinal discs for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages
- A61F2/447—Joints for the spine, e.g. vertebrae, spinal discs for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages substantially parallelepipedal, e.g. having a rectangular or trapezoidal cross-section
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
- A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
- A61F2002/30772—Apertures or holes, e.g. of circular cross section
- A61F2002/3079—Stepped or enlarged apertures, e.g. having discrete diameter changes
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
- A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
- A61F2002/30904—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves serrated profile, i.e. saw-toothed
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/44—Joints for the spine, e.g. vertebrae, spinal discs
- A61F2002/448—Joints for the spine, e.g. vertebrae, spinal discs comprising multiple adjacent spinal implants within the same intervertebral space or within the same vertebra, e.g. comprising two adjacent spinal implants
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- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
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- A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
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- A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
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- A61F2230/0017—Angular shapes
- A61F2230/0019—Angular shapes rectangular
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- A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2230/0063—Three-dimensional shapes
- A61F2230/0082—Three-dimensional shapes parallelepipedal
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- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2250/0004—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof adjustable
- A61F2250/0006—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof adjustable for adjusting angular orientation
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2250/0004—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof adjustable
- A61F2250/0009—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof adjustable for adjusting thickness
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
- A61F2310/00005—The prosthesis being constructed from a particular material
- A61F2310/00011—Metals or alloys
- A61F2310/00017—Iron- or Fe-based alloys, e.g. stainless steel
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
- A61F2310/00005—The prosthesis being constructed from a particular material
- A61F2310/00011—Metals or alloys
- A61F2310/00023—Titanium or titanium-based alloys, e.g. Ti-Ni alloys
Definitions
- the present application is directed to an expandable fusion cage which is anteriorly intervertebrally inserted in the spine of a patient and is also anteriorly expandable .
- Fusion cages as well as related interbody devices, are frequently utilized in spinal surgery between vertebrae of a patient.
- one or a pair of interbody devices are placed between the vertebrae to provide support and promote fusion between vertebrae ⁇ where such is necessary due to disease, injury, general deterioration or a congenital problem.
- the anterior sides or fronts of the vertebrae also require additional spacing in comparison to posterior sides. Therefore, it is often desirable to use an anteriority expandable interbody device so that the vertebrae are spread or spaced more on the anterior sides thereof than on the posterior sides thereof.
- Interbody devices which provide for anterior greater expansion are generally referred to as interbody expansion devices or expansion cages. These cages are specifically expandable on the anterior end thereof, so that the fronts of the adjacent vertebrae between which the cages are located are more greatly spaced than the rears. It is noted that interbody devices, such as fusion cages, may be inserted into the intervertebral space anteriorly or posteriorly. The present application is directed to the types of devices that are inserted anteriorly or from the front of the patient and are generally referred to as anterior interbody devices or anterior fusion cages. Interbody devices typically must be very strong along the entire length of the top and bottom walls of the device that engage the vertebrae.
- interbody devices in the prior art have provided for anterior expansion, but have not well supported the anterior end of the upper and lower walls.
- Such prior art devices have sometimes provided some kind of a wedge or rod that is urged axially along a ramp of the device in such a way as to expand the anterior portion subsequent to the cage being placed between the vertebrae .
- interbody devices such as fusion cages
- a surgeon may also find that it is necessary to have more anterior expansion than was initially anticipated. Consequently, it is often desirable to have a variable expansion cage be able to increase the expansion in increments that allow the surgeon to determine if expansion is sufficient with each advance in expansion and thereafter go to a greater expansion, if necessary.
- interbody devices such as fusion cages
- interbody devices are quite expensive to produce in general. This is because the body of the devices must be made to very high tolerances in order to provide reproducible results and to provide the strength necessary to support the spine of the person.
- the interbody device includes a body which may be of different types, including bodies rectangular in shape, in which case the device is slid or driven between the vertebrae, or generally cylindrical in shape and threaded, in which case the device is screwed between the vertebrae.
- the body has an upper wall and a lower wall that are connected by a rear or posterior wall.
- the body is hinged about the rear wall by utilization of a material of construction that is flexible or resilient such as stainless steel or titanium, so that the upper and lower walls are able to pivot relative to each other at the rear, when a spreading force is applied to the walls, so that anterior ends of the walls rotate from an initial non-expanded configuration anteriorly to an expanded configuration anteriorly. Unless a spreading force is applied, the upper and lower walls are urged to remain generally parallel to each other.
- the upper and lower walls also have legs on either side of the anterior end thereof that face toward similarly positioned legs on the other wall and which abut against each other when the device is in the unexpanded configuration thereof.
- An aperture is formed between the legs and preferably extends through the body in such a manner so as to form an interior chamber suitable for receiving bone chips or other growth promoting media.
- the body also preferably has upper and lower windows which communicate with the chamber and open onto the surface of the bones, when in use, so as to promote growth of the bone through the interbody device.
- the rear wall of the body includes a threaded bore.
- An expansion member preferably having a shape similar to a large headed bolt, is utilized to apply spreading force to the upper and lower walls so as to expand the body anterior end. The point or region of engagement between the expansion member and cage walls preferably remains the same throughout the expansion process by use of a wedge surface on the expansion member and is located near the anterior end of the cage.
- the expansion member includes an elongate shaft threaded on one end so as to be operably and threadably received in the rear wall bore and having a head at an opposite end.
- the shank includes a stop, preferably a section of the shank of enlarged diameter compared to and adjacent to the threaded end, which insures that the expansion member is properly positioned during use.
- the expansion member head includes a first wedge surface that slopes radially outward and frontwardly relative to the remainder of the shank near an anterior end of the shank.
- the wedge surface preferably has the shape of a truncated cone.
- the wedge surface is sized, and shaped in position so as to engage a wedge mating edge or surface located on each of the lower and upper walls.
- the wedge surface first engages the mating surfaces on the walls at the posterior end of the wedge surface and then the mating surface slides along the wedge surface as the expansion member is screwed into the rear wall bore. In this manner the anterior end of the body is forced to spread or space vertically until a forward or anterior end of the edge of the wedge surface is reached.
- the wedge surface is adjacent to a generally cylindrical shaped support surface and transfers the support of the upper and lower walls to the cylindrical shaped surface as the expansion member is further rotated clockwise and advanced into the rear wall bore.
- the cylindrical support surface is preferably coaxial with an axis of rotation of the expansion member such that continued advancement of the expansion member to the stop causes the support surface to pass between the anterior ends of the upper and lower walls and to thereafter provide support to the upper and lower walls and keep the walls in a selected spaced relationship relative to each other.
- a pair of side by side cages may be integrally joined or joined together by fasteners in order to form a single operative unit which preferably requires a pair of expansion members, but which may also use a single expansion member.
- the devices when used in side by side pairings, are frequently joined by a connector so as to further assure the stability of the devices.
- each interbody device is normally provided with a set of expansion members wherein each member of the set provides a different degree of spacing of the anterior end of the interbody device.
- a surgeon can utilize the interbody device without an expansion member or can alternatively select from a number of different sized expansion members to provide appropriate expansion of the anterior end of the interbody device. Normally, the surgeon would start with no or minimal expansion and then increase incrementally toward greater expansions by removal of less expanding devices and replacement by greater expanding devices until the surgeon is satisfied with the expansion provided.
- the objects of the present invention are: to provide an interbody device or fusion cage for use between a pair of vertebrae that is expandable; to provide such an interbody device that has a body and at least one expansion member wherein the expansion member or body has a wedge surface that engages an anterior portion of upper and lower walls of the body so as to spread the body from near the anterior end thereof; to provide such a device wherein a single body may be utilized either without an expansion member or in conjunction with any of an alternative group of modular expansion members each producing a different degree of expansion contained in a kit of expansion members; to provide such a device wherein an expansion member providing one degree of expansion can be removed and an expansion member providing a greater degree of expansion can be subsequently inserted; to provide such a device wherein the expansion members include an anterior or frontward cylindrical surface upon which anterior, portions of the upper and lower body walls rest subsequent to full insertion of the expansion member; to provide such a device wherein the device expands vertically and not horizontally or side to side; to provide such a device wherein a pair
- Figure 1 is a perspective and exploded view of an expandable, anterior interbody fusion device, illustrating a body of the device in a non-expanded configuration and an expansion member.
- Figure 2 is a side elevational and exploded view of the body in a non-expanded configuration and the expansion member.
- Figure 3 is a side elevational view of the body and expansion member joined together with portions removed to show interior detail thereof.
- Figure 4 is a front elevational view of the body with the expansion member inserted therein and in an expanded configuration thereof.
- Figure 5 is a top plan view of the body with the expansion member inserted therein.
- Figure 6 is a side elevational view of a first expansion member.
- Figure 6a is a side elevational view of the body with the first expansion member inserted therein.
- Figure 7 is a side elevational view of a second expansion member.
- Figure 7a is a side elevational view of the body with the second expansion member inserted therein.
- Figure 8 is a side elevational view of a third expansion member which is the expansion member shown in Figs. 1 through 5.
- Figure 8a is a side elevational view of the body with the third expansion member received therein.
- Figure 9 is an enlarged and fragmentary cross- sectional view of the third expansion member, taken along line 9-9 of Fig. 8.
- Figure 10 is a perspective and partly exploded view of a pair of interbody devices of the type shown in Fig.
- FIG. 11 is a perspective view of the interbody devices and vertebrae similar to the view of Fig. 10 except both expansion members have been fully inserted in the bodies and the bodies have been anteriorly expanded.
- Figure 12 is a side elevational view of the interbody devices and vertebrae in the configuration seen in Fig. 11 with an expansion member fully inserted in a body and with the body expanded to anteriorly space vertebrae associated therewith.
- Figure 13 is a side elevational and partly exploded view of one of the interbody devices between the vertebrae with the body thereof expanded by an expansion member and showing a frontward connecting plate being joined thereto by a set screw.
- Figure 14 is a perspective view of the interbody devices positioned between the vertebrae- with the connecting plate joined thereto.
- Figure 15 is a perspective and partly exploded view of a first modified interbody device having the overall length equivalent to a pair of the devices of the type shown in Fig. 1 and utilizing a pair of expansion members .
- Figure 16 is a perspective view of the modified interbody device showing a pair of expansion members fully positioned therein and with an anterior end of the device in an expanded configuration.
- Figure 17 is a side elevational view of the modified interbody device with the expansion members therein and expanded so as to space anterior ends of the vertebrae more than the posterior ends thereof .
- Figure 18 is a side elevational and partly exploded view similar to Fig. 17 except with a support plate being shown joined to the modified device and with a set screw in a position to connect the plate to the modified device.
- Figure 19 is a perspective view of the modified device between a pair of vertebrae with the connecting plate joined thereto.
- the reference numeral 1 generally designates an interbody device or fusion cage in accordance with the present invention seen in Figs. 1 to 14.
- the device 1 includes a body 5 and a set of expansion members including expansion members 7, 8 and 9.
- the expansion member 9 is the largest of the set and is seen in Figs. 1 through 5 as well in Figs. 8 and 8a.
- the expansion member 7 is the smallest of the group and is seen in Figs. 6 and 6a. Although only three expansion members are shown in the present embodiment and together with the body 5 form a kit for use in spinal surgery, it is foreseen that a much larger group of expansion members, each having a different head diameter or expansion capability, could be included in the kit with small degrees of separation between the size thereof. In some situations the kit may include only two expansion members .
- the body 5 includes a top or upper wall 15, a bottom or lower wall 16 and a posterior or rear wall 17.
- the upper wall 15 and lower wall 16 are joined near the posterior ends thereof to the rear wall 17.
- posterior and anterior pertain to configurations in the human body and posterior would be to the left in Fig. 2, while anterior would be to the right in Fig.
- the upper wall 15 and lower wall 16 are initially in generally parallel relationship to one another and are urged to that position by the springy or resilient nature of materials of construction thereof that try to maintain the non-expanded shape thereof unless force is applied to change that shape.
- the body 5 is constructed of a bio-compatible metal or the like such as stainless steel or titanium and the rear wall acts as a spring to try to maintain the upper wall and lower wall 15 and 16 in parallel relationship, while also functioning as a hinge, when the two walls 15 and 16 are forced apart opposite the rear wall 17 by application of spreading force to the walls 15 and 16.
- the upper and lower walls 15 and 16 have bone engaging outer surfaces 20 and 21 which are serrated in such a manner as to bite into the bone of vertebrae 24 and 25 respectively, after being placed therebetween.
- the upper and lower walls 15 and 16 also have fenestration or a window 28 and 29 respectively. Although the present embodiment is shown with single windows 28 and 29, it is foreseen in some circumstances that no windows would be provided and in other circumstances multiple windows may be provided along the walls 15 and 16.
- Near the anterior end 30 and 31 of each of the walls 15 and 16 and located on either side thereof are a pair of legs 32 and 33 respectively.
- the legs 32 and 33 of each of the walls 15 and 16 extend toward one another and respective pair of legs 32 and legs 33 abut when the body 5 is in a non-expanded configuration thereof, such as is shown in Fig. 1. In this manner the front or anterior ends 30 and 31 of the walls 15 and 16 are supported by the legs 32 and 33 in the non-expanded configuration.
- Vertical slots 36 and 37 are medially formed in the walls' anterior ends 30 and 31.
- An aperture 40 is located between the sets of legs 32 and 33 and is a somewhat elongate oval shaped slot which alternatively receives the expansion members 7, 8 or 9, as is noted below.
- Located along and between the walls 15 and 16 are a pair of side windows 45 and 46.
- the rear wall 17 includes a centrally located threaded bore 50.
- a bone chip receiving cavity 51 is located between the walls 15, 16 and 17.
- Each of the expansion members 7, 8 and 9 include an elongate shank 60 having a threaded posterior portion 61 that is sized and shaped to be received in the rear wall threaded bore 50.
- Each shank 60 also has a stop 64 that is a region of increased diameter located at the forward end of the posterior threaded portion 61 thereof.
- Each of the expansion members 7, 8 and 9 also include a head generally identified as the number 66.
- the expansion member 7 has a head 66a
- the expansion member 8 has a head 66b
- the expansion member 9 has a head 66c.
- the heads 66a, 66b, and 66c each include a rearward wedge shaped surface and a support surface which in each case is identified by the reference numerals 69 and 70 respectively along with the letter identifying the particular head associated therewith.
- the wedge shaped surfaces 69 are generally in the shape of a truncated cone.
- the support surfaces 70 are generally in the shape of a cylindrical surface.
- the surfaces 69 and 70 are coaxial with an axis of rotation A associated with each of the expansion members 7, 8 and 9.
- the associated wedge shaped surface 69 engages a wedge mating receiver that is a surface or edge 73. While the present embodiment illustrates the edge 73 as being linear, it is foreseen that an angled planar surface could function for this purpose also.
- the support surfaces 70 in turn engage and support facing surfaces 74 of wall 15 and surface 75 of wall 16. Preferably the surfaces 74 and 75 extend approximately the width of the head support surface 70.
- the heads 66a, b and c of each of the expansion members 7, 8 and 9 increase progressively in diameter.
- a connecting and supporting plate 80 is preferably utilized to join a pair of devices 1 together in the manner shown in Fig. 14.
- the plate 80 includes a pair of panels 83 connected by a rod 84.
- the panels 83 have a centrally located and countersunk aperture 86 which receives a set screw 87 which is in turn seated in threaded bores 77 in the expansion members 7, 8 or 9.
- Each of the panels 83 also includes a pair of lugs 90 that mate with the body slots 36 and 37.
- the purpose of the connecting plate 80 is both to provide greater stability to the devices 1 and to provide upper and lower surfaces 93 and 94 that operably engage anterior comparatively hard bony surfaces 96 and 97 of the vertebrae 24 and 25 in order to resist subsidence of the vertebrae 24 and 25 relative to the devices 1.
- the pad or disc located between a pair of vertebrae 24 and 25 is removed and a pair of the bodies 5 are inserted in the manner shown in Fig. 10.
- the bodies 5 are not positioned exactly parallel to one another, but rather at slight angles relative to one another to better resist against the bodies 5 being inadvertently removed during usage. Once the bodies 5 have been positioned between the vertebrae 24 and 25, the surgeon checks to determine whether anterior expansion is desirable.
- expansion member having the smallest diameter in this case expansion member 7
- the wedge shaped surface 69a engages and biases against the mating surface or edge 73 of the upper and lower walls 15 and 16 so as to space the anterior ends 30 and 31 of the upper wall and lower walls 15 and 16 respectively.
- the surgeon determines whether or not additional anterior expansion is required. If so, the first expansion member 7 is removed from each of the bodies 5 and a second expansion member of somewhat larger diameter, such as expansion member 8 is installed. This process is continued until the surgeon is satisfied that the proper expansion has been achieved.
- FIG. 15 through 19 Illustrated in Figs. 15 through 19 is a second modified embodiment of an interbody device in accordance with the present invention, generally identified by the reference numeral 100.
- the device 100 includes a unitary body 105 and at least a pair of expansion members 107.
- the device 100 is similar in many ways to the device 1 and consequently, the similarities will not be discussed in great detail.
- the major difference between the device 100 and the device 1 is that the device 100 is essentially a pair of the devices 1 that have been joined together in side by side relationship with unnecessary structure removed.
- Each of the devices 100 include an upper wall 115, a lower wall 116 and a rear wall 117.
- the rear wall 117 functions as both a spring hinge to urge the walls 115 and 116 into parallel relationship with one another and to also allow anterior ends 130 and 131 of the walls 115 and 116 respectively to expand when the expansion members 107 are inserted therein.
- Fig. 16 illustrates the device 100 located between a pair of vertebrae 124 and 125 with the expansion members 107 fully positioned within the body 105 and within anterior ends 130 and 131 expanded as compared to a non- expanded configuration, as is shown in Fig. 15.
- a solid support and connecting plate 180 is joined to the device 100 by a pair of set screws 187, as is seen in Fig. 19.
- the device 100 is used in a similar manner to the device 1, except that only a single device 100 is utilized between a pair of vertebrae 124 and 125.
- expansion members having a size other than the illustrated expansion member 107 may be utilized in order to provide different degrees of expansion of the device 100, so that the device 100 has a plurality of expanded configurations available thereto, as well as the unexpanded configuration shown in Fig. 15.
- the expansion members may be of varying types under the invention.
- the heads of the expansion members may have opposed sectors removed so as to mate with an insertion tool replacing such sectors. In this way the tool may be used to insert the expansion members and then removed with the remaining sectors used to support the opposed walls of the cage body.
- a rod can also be used with such cages that is inset in a channel in the front of the expansion member to prevent them from turning after insertion is complete and can be elongate to two of the bodies for greater stability.
- Such rods are held in the expansion members by set screws in bores intersecting with the rod channels.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2001289152A AU2001289152A1 (en) | 2000-12-05 | 2001-08-20 | Anterior variable expandable fusion cage |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/729,758 US6773460B2 (en) | 2000-12-05 | 2000-12-05 | Anterior variable expandable fusion cage |
US09/729,758 | 2000-12-05 |
Publications (1)
Publication Number | Publication Date |
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WO2002045627A1 true WO2002045627A1 (en) | 2002-06-13 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2001/041799 WO2002045627A1 (en) | 2000-12-05 | 2001-08-20 | Anterior variable expandable fusion cage |
Country Status (3)
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US (1) | US6773460B2 (en) |
AU (1) | AU2001289152A1 (en) |
WO (1) | WO2002045627A1 (en) |
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- 2001-08-20 AU AU2001289152A patent/AU2001289152A1/en not_active Abandoned
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Also Published As
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US20020068977A1 (en) | 2002-06-06 |
US6773460B2 (en) | 2004-08-10 |
AU2001289152A1 (en) | 2002-06-18 |
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