WO1996040016A2 - Intervertebral disk stabilizer and instrument for reduction of spondylolisthesis - Google Patents
Intervertebral disk stabilizer and instrument for reduction of spondylolisthesis Download PDFInfo
- Publication number
- WO1996040016A2 WO1996040016A2 PCT/US1996/009114 US9609114W WO9640016A2 WO 1996040016 A2 WO1996040016 A2 WO 1996040016A2 US 9609114 W US9609114 W US 9609114W WO 9640016 A2 WO9640016 A2 WO 9640016A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- implant
- adjacent vertebrae
- vertebrae
- disk space
- members
- Prior art date
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Definitions
- the present invention relates to an intervertebral implant and a method of stabilizing adjacent vertebrae. More specifically, the present invention relates to rectangularly-shaped disk implants which are expanded in the middle portion used for spinal fusion. If necessary in treating the patient, the present invention also contemplates reduction of spondylolisthesis, e.g., alignment of the vertebrae comprising the spinal column. In this second aspect, the present invention relates to apparatus which is inserted into the space between adjacent, misaligned vertebrae, engages the bodies of the adjacent vertebrae, and pulls the vertebrae back into alignment.
- the classical treatment for a ruptured disk is diskectomy, i.e., removal of the disk from between the vertebrae. In this process, all or a portion of the intervertebral disk is removed, leaving a defect which bothers the patient throughout the rest of their life.
- An additional procedure is to replace the disk space with a bone graft, usually bone chips cut from the patient's iliac crest, bringing about fusion of the vertebrae above and below the disk and eliminating the space between the vertebrae.
- diskectomy with fusion is not ideal because the replaced bone does not have the function of the cartilaginous tissue of the disk, i.e. no cushioning effect, and has several complications.
- conventional bone plugs used to pack the disk space do not conform to the space of the disk because the disk space is wider in the middle and narrower at its anterior and posterior ends. For this reason, currently available bone plugs have only four contact points, i.e. at the front and back of the disk space.
- a vertebral disk stabilizer comprising an elongate implant having first, second, third and fourth sides providing the implant with a substantially rectangular cross-sectional shape of minimal height defined by the first and second sides and maximal width defined by the third and fourth sides, the third and fourth sides being arched from one end of the implant to the other to provide the portion intermediate the ends with a width larger than the width of the implant at the ends thereof.
- a lock having a bearing surface formed thereon is detachably mounted to one end of the implant to prevent rotation of the lock relative to the implant with the bearing surface oriented at approximately 90° to the height of the implant.
- Also provided is a method of stabilizing two adjacent vertebrae after removing a portion of the intervertebral disk from therebetween to form a disk space comprising the steps of inserting a substantially rectangularly-shaped, elongate implant having a width greater than its height into the disk space with the implant oriented so that the top and bottom thereof engage the bodies of the adjacent vertebrae, rotating the implant approximately 90° in the disk space to contact the bodies of the adjacent vertebrae with the sides of the implant, and thereafter preventing rotation of the implant relative to the vertebrae.
- an apparatus for aligning adjacent vertebrae comprising an elongate handle having a longitudinal bore therethrough, an implant comprised of first and second side-by-side members, the first member being integrally mounted to the handle, and means formed on the implant for selectively engaging adjacent vertebrae to prevent relative movement between the respective first and second members and the adjacent vertebrae.
- a mandrel is positioned in the bore in the handle and is connected to the second member for moving the second member relative to the first member in the direction of the longitudinal axis of the handle.
- the mandrel is preferably threaded and the bore in the handle is provided with a matching set of threads such that rotation of the mandrel causes movement of the second member along the longitudinal axis of the handle.
- Also provided is a method of aligning adjacent vertebrae after removing a portion of the intervertebral disk from therebetween to form a disk space comprising the steps of inserting an elongate implant comprised of first and second side-by-side members having means formed thereon for selectively engaging the vertebrae adjacent the disk space into the disk space and moving the second member relative to the first member until the first and second members are approximately aligned with the adjacent vertebrae.
- the implant is rotated by approximately 90° to cause the vertebrae engaging means to engage the vertebrae and the second member is then moved relative to the first member to align the vertebrae to which it is engaged with the vertebrae to which the first member is engaged.
- Figure 1 is a lateral view of a portion of a human spinal column having the vertebral disk stabilizer of the present invention inserted therein and having a portion of the bodies of the vertebrae adjacent the implant shown cut away and/or in shadow lines to show the engagement of the vertebral bodies by the vertebral disk stabilizer.
- Figure 2 is an exploded, perspective view of the vertebral disk stabilizer of
- Figure 3 is a top plan view of the implant of Fig. 1 having a handle mounted thereto in place of the lock shown in Fig. 2.
- Figure 4 is an exploded, perspective view of a second preferred embodiment of the vertebral disk stabilizer of the present invention.
- Figure 5 is a longitudinal, partial sectional view of a preferred embodiment of an apparatus for correcting misalignment of two adjacent vertebrae constructed in acoordance with the present invention.
- Figure 6 is an end view of the apparatus of Fig. 5.
- Figure 7 is a view similar to that of Fig. 5 but with the mandrel removed therefrom.
- Figure 8 is an end view of the apparatus of Fig. 5.
- Figure 9 is a side, elevational view of the mandrel of the mandrel after removal from the apparatus of Fig. 5.
- Figure 10 is an end view of the mandrel of Fig. 5.
- Figure 1 1 is a partially schematic, lateral view of a portion of the lumbar spine showing the use of the apparatus of Fig. 5 to align the fourth and fifth lumbar vertebrae.
- Figure 12 is a top, plan view of an alternative embodiment of the apparatus of Fig. 5 showing the two halves of the body in their first, side-by-side position.
- Figure 13 is a top, plan view of the apparatus of Fig. 12 showing the two halves of the body in the second position.
- a disk stabilizer constructed in accordance with the teachings of the present invention is shown implanted in a human spinal column in Fig. 1.
- the vertebral disk stabilizer indicated generally at reference numeral 10, is implanted between the bodies 12 and 14 of two adjacent vertebrae 16 and 18, respectively, in the disk space (not numbered) from which a portion of the intervertebral disk 20 is removed, i.e. by simple diskectomy and small laminotomy.
- the vertebral disk stabilizer 10 is comprised of an elongate implant 22. lock 24, and means for detachably mounting the lock 24 to one end 25 of the implant 22.
- the mounting means takes the form of a bolt 26 passing through a bore 28 in lock 24, the threads of bolt 26 engaging complementary threads in the walls of the bore 30 in the end 25 of implant 22.
- implant 22 is comprised of first and second sides 32 and third and fourth sides 34 defining a substantially rectangularly-shaped cross-section.
- the height H of the rectangularly shaped cross-section is defined by first and second sides 32 and the width W is defined by the third and fourth sides 34 and, as is apparent by comparison of H and W, the height of H of implant 22 is less than the width W.
- H is minimized to facilitate insertion of the second end 36 into, and positioning of implant 22 in, the disk space from which a portion of the intervertebral disk 20 was removed and W is maximized to provide the desired stabilization to adjacent vertebrae 16 and 18.
- Third and fourth sides 34 are arched from one end of implant 22 to the other to provide the portion of implant 22 intermediate the ends 25 and 36 with a width W which is larger than the width W" at the ends 25 and 36. Because the sides 32 of implant 22 are substantially flat and the sides 34 are arched from one end 25 to the other end 36, implant 22 is described as being a biplanar, bi-convex implant.
- the bi-convex sides 34 of implant 22 are provided with a plurality of teeth 38 for biting into the adjacent vertebrae 16 and 18 as will be explained in more detail below.
- the end 36 of implant 22 is formed in a blunt, or rounded shape to reduce the likelihood of injury to the nerves of the spinal cord during insertion into the disk space.
- lock 24 is substantially square when viewed from the end 40 along the axis of the bore 28 therethrough and U-shaped when viewed from the side.
- the inside surfaces 42 of the arms 44 of the U-shaped lock 24 are flat for contacting the first and second sides 32 of implant 22 to prevent rotation of lock 24 relative to implant 22 when lock 24 is mounted to implant 22 and secured thereto by bolt 26.
- the surfaces 42 are provided with a slot 46 for receiving a complementary-shaped key 48 to facilitate assembly of lock 24 to implant 22.
- the slot 46 may also be located on the implant 22 and the key 48 may be located on the lock 24 without any difference in the function of those component parts.
- the bore 28 in lock 24 is aligned with the bore 30 in implant 22.
- the sides of the square end 40 of lock 24 provide surfaces 50 for bearing against the bodies 12 and 14 of adjacent vertebrae 16 and 18 as also explained in more detail below. It will be recognized by those skilled in the art who have the benefit of this disclosure that the bearing surfaces 50 need not be flat and that the end 40 of lock 24 need not be square. Other shapes and configurations may be utilized as needed to insure that movement of lock 24 is limited by the bodies of the adjacent vertebrae 16 and 18.
- the purpose of the bi -planar, middle expanded, bi-convex implant 22 is to enable insertion of the implant 22 into the disk space and turning by approximately 90° to increase the disk height and stabilize the disk space.
- lock 24 is to lock implant 22 against instability when in the vertical position so as to maintain the disk height thereafter.
- an applicator 52 mounted to the end 25 of implant 22.
- applicator 52 is mounted to implant 22 by screwing the threaded end 54 thereof into the threaded bore 30 in implant 22.
- implant 22 is inserted into the disk space and rotated therein using applicator 52 as explained below.
- Applicator 52 is detached from implant 22 by rotating in the opposite direction while rotation of implant 22 is restrained.
- Fig. 1 The use of the stabilizer 10 of the present invention in, for instance, a method of lumbar intervertebral disk stabilization, or "LIDS," is illustrated in Fig. 1.
- Surgery is performed as in a simple diskectomy and the intervertebral disk 20 is exposed through a small laminotomy.
- the disk material is removed and any nerve root compression is corrected.
- the posterior longitudinal ligament (not shown) and disk cartilage are removed until the surface of the bodies 12 and 14 of adjacent vertebrae 16 and 18. respectively, are exposed above and below the disk space.
- the vertebrae 16 and 18 are distracted to open the disk space, and once the desired "spread" is achieved, the middle portion of the disk space is packed with cancellous bone chips (not shown). Because the posterior longitudinal ligament is left intact to the opposite side and to the center of the disk space, the bone chips are held in place in the disk space.
- An implant 22 having a height H and width W selected to fit the disk space is then mounted on applicator 52 by screwing on to the threaded end 54.
- the appropriately-sized implant 22 is then inserted into the disk space using the applicator 52 with the implant 22 oriented so that the top and bottom thereof, i.e., the first and second sides 32. engage the bodies 12 and 14 of adjacent vertebrae 16 and 18. respectively.
- implant 22 is then moved further into (or back out of) the disk space in an anterior-posterior direction so as to enable the implant 22 to be positioned in the disk space at a position in which the expanded, middle portion and the smaller width ends 25 and 36 of the third and fourth sides 34 of implant 22 contact the respective lower and upper surfaces of the bodies 12 and 14 of the adjacent vertebrae 16 and 18 when rotated by approximately 90° using the applicator 52.
- the corners of the implant 22 between the first and second surfaces 32 and the third and fourth surfaces 34 are rounded as shown at 35, the rounded corners 35 effectively acting as planes, or ramps, to lever the adjacent vertebrae 16 and 18 apart during rotation.
- the respective lower and upper surfaces of the vertebral bodies 12 and 14 are slightly concave such that the larger width middle portion W" of implant 22 allows the implant 22 to engage substantially more of the respective surfaces of the vertebral bodies 12 and 14 than conventional prosthetic devices, thereby providing increased stability to the fusion once further rotation of implant 22 in the disk space is prevented as described below.
- the applicator 52 is detached by unscrewing and backed out of the incision in the patient.
- Lock 24 is then inserted through that same incision and, using the slot 46 and key 48, the bore 28 in lock 24 and bore 30 in implant 22 are aligned and the bolt 26 is inserted and tightened to secure lock 24 to the implant 22. Securing the lock 24 to implant 22 in this manner prevents relative rotation between lock 24 and implant 22 and the bearing surfaces 50 of lock 24 bear against the bodies 12 and 14 of the adjacent vertebrae 16 and 18 to prevent rotation of the lock 24 relative to the adjacent vertebrae 16 and 18 against which the bearing surfaces 50 bear.
- the bearing surfaces 50 bear against the cortical end plates of the respective vertebral bodies 12 and 14, which are comprised of non-cancellous bone, and which provide a hard, relatively smooth surface.
- the end 40 of lock 24 is preferably supplied in a plurality of different sizes and shapes other than the square shaped end 40 shown in the figures so as to allow the surgeon to select an appropriately sized and shaped lock which provides a close fit with the space between vertebral bodies.
- a small amount of a physiologically compatible adhesive of a type known in the art is applied over the cancellous bone chips just medial to the implant to close off the remaining portion of the opening into the disk space.
- the patient should be able to ambulate soon after the LIDS procedure because of the stability imparted to the spinal column by the implant of the present invention. Before narrowing of the disk space occurs, the cancellous bone chips will have started the fusion process.
- the stabilizer 10 is also used to advantage to perform, for instance, a posterior lateral intertransverse fusion.
- the implant 22 is inserted into the region of the disk space from which a portion of the disk has been removed as described above with the lock 24 and the posterior lateral fusion performed. Because the implant 22 provides stability to the spine until the posterior lateral fusion is solid, the patient is generally able to ambulate soon after surgery. This procedure also prevents the narrowing of the disk space, which is a common problem with posterior lateral fusion.
- Implant 22 Removal of the implant 22 is accomplished with relative ease compared to conventional implants.
- the bolt 26 is screwed back out of implant 22 and lock 24 is pulled out of the disk space.
- Applicator 52 is re-inserted and screwed into the bore 30 in implant 22 and used to rotate implant 22 by approximately 90°, causing the first and second sides, having minimal height, to contact the bodies 12 and 14 of adjacent ⁇ crtebrae 16 and 18 so as to allow posteriorly-directed movement of the implant 22 out of the disk space.
- FIG. 4 An alternative embodiment of the implant of the present invention is shown in Fig. 4 in which the first and second sides 32' of implant 22' are substantially flat but not parallel along their longitudinal axes.
- the resulting wedge shape of the implant 22' facilitates insertion into the disk space, the rounded end 36 reducing the likelihood of injury to the nerves of the spinal cord during insertion into the disk space.
- comparison of the widths W, W", and W" of implant 22' will show that the width W of implant 22' at the end 36' is less than the width W" at the end 25'. Both widths are less than the width W" in the middle, expanded portion of implant 22'.
- the teeth 38 located closest to the end 25 of implant 22 are slanted toward the end 25 and the teeth 38 closest to the end 36 of implant 22 are slanted toward the end 36.
- the teeth in the middle portion of implant 22, e.g., between the two sets of slanted teeth, are oriented vertically.
- the apparatus is comprised of an elongate handle 1 1 1 and an elongate body 112.
- the body 112 is comprised of first and second side-by-side members 113 and 114, respectively, the first member 113 being integrally mounted to handle 111 and the second member 114 being movable relative to the first member 113 in the direction of the longitudinal axis of the shaft 1 15 of handle 1 1 1.
- Means, in the form of the teeth 138, is provided on body 112 for selectively engaging the adjacent vertebrae 133, 137 when the body 112 is inserted therebetween to prevent relative movement between the respective first and second members 1 13 and 114 and the adjacent vertebrae 137 and 133 to which the first and second members 113 and 1 14 are engaged.
- the shaft 115 of handle 1 1 1 is provided with a longitudinal bore 1 16 therethrough having a mandrel 117 positioned therein, the second member 114 being mounted to mandrel 117.
- the shaft 115 is prov ided with a tubular barrel 118 having a collar 119 positioned therein.
- Collar 119 is also provided with a longitudinal bore 116', the longitudinal axis of which is aligned with the longitudinal axis of the bore 1 16 in mandrel 1 17 which is provided with a set of threads 120 for receiving the threaded end 121 of mandrel 117.
- Collar 1 19 is retained within barrel 1 18 by the keeper 122 which is retained on the end of barrel 1 18 by screws 123.
- An adjustment knob 124 is integrally mounted to collar 1 18 by screws 126.
- the second member 1 14 moves relative to first member 1 13 from a first position in which the members 113 and 114 are in side-by-side, parallel relationship to each other to a second position along the longitudinal axis of the shaft 1 15 of handle 111 in which the two members remain parallel to each other but are no longer side-by-side as shown in Fig. 1 1.
- first member 113 is formed in the shape of a half round hollow 127 for receiving the round mandrel 117 for retaining the two members 113 and 1 14 in tight, parallel, side-by-side relationship when second member 114 is moved from the first position to the second position.
- the two members 113 and 1 14 When the first and second members 113 and 14 are in the first side-by-side position shown in Figs. 5 and 6. e.g., when the mandrel 117 is rotated to draw the end 1 6 of second member 1 14 against the end 154 of handle 11 1, the two members 113 and 1 14 form an elongate body 112 having a shape which is similar to the shape of the monolithic implant 22 shown in Figs. 1-4. Referring, however, to the body 112 lor the time being, when side-by-side, the two members 113 and 1 14 form a body 112 that is comprised of first and second sides 132 and third and fourth sides 134 providing a substantially rectangularly-shaped cross-section.
- the height H 6 of the rectangularly-shaped cross-section is defined by first and second sides 132 and the width W is defined by the third and fourth sides 134 and. as is apparent by comparison of H 6 and W 6 , the height H 6 of body 112 is less than the width W 6 .
- H 6 is minimized to facilitate insertion of the second end 136 into, and positioning of body 112 in, the disk space from which a portion of the intervertebral disk 130 was removed and W 6 is maximized to provide the desired stabilization to adjacent vertebrae 133 and 137.
- Third and fourth sides 134 are arched from one end of body 112 to the other to provide the portion of body 112 intermediate the ends 125 and 136 with a width W' 6 which is larger than the width W" ft at the ends 125 and 136. Because the sides 132 of body 112 are substantially flat and the sides 134 are arched from one end 125 to the other end 136, body 112 is described as being a biplanar, bi-convex body.
- the convex, or arched, sides 134 of body 1 12 are provided with a plurality of teeth 138 for biting into the adjacent vertebrae 133 and 137 as will be explained in more detail below.
- the end 136 of body 1 12 is formed in a blunt, or rounded shape to reduce the likelihood of injury to the nerves of the spinal cord during insertion into the disk space.
- FIG. 11 the use of the apparatus 110 for reduction of spondylolisthesis is shown.
- the fourth lumbar vertebrae (L4) 133 is shown as having shifted anteriorally, leaving that vertebrae out of alignment with the fifth lumbar vertebrae (L5) 137 and the vertebrae comprising the sacrum 135.
- surgery is performed as in a simple diskectomy and the intervertebral disk (not shown) is exposed through a small laminotomy. Disk material is removed and any nerve root compression is corrected.
- the posterior longitudinal ligament (not shown) and disk cartilage are removed until the surface of the bodies 129 and 131 of the adjacent vertebrae (L4 and L5) 133 and 137, respectively, are exposed above and below the disk space.
- the adjacent vertebrae 133 and 137 are distracted to open the disk space.
- the body 112 of apparatus 110 having the first and second members 113 and 1 14 initially in the above-described side-by-side relationship, is then inserted into the disk space with the top and bottom thereof, i.e., the first and second substantially planar sides 132. engaging the adjacent vertebrae 133 and 137 so that the teeth 138 formed on the third and fourth sides 134 of body 112 extend into the disk space without engaging the adjacent vertebrae 133 and 137.
- the implant is oriented in the disk space so that, when rotated as described below, the first member 113 is the portion of the body 112 which contacts the body 131 of L5 137 and the second member contacts the body 129 of L4 133.
- body 112 is oriented so that first member 113 is positioned in close proximity to the body 131 of the vertebrae 137 which is aligned with the axis, or centerline CL, of the spinal column and second member 1 14 is positioned in close proximity to the axis of the body 129 of the vertebrae 133 which is out of alignment.
- the body 1 12 of apparatus 110 is inserted until the middle portion of first member 113 is positioned adjacent the concavity in the upper surface of the body 131 of the L5 137.
- mandrel 117 is then rotated to advance the second member 114, e.g., the portion having the wider width W" 6 , anteriorally until the middle portion, e.g., the portion having the wider width W" 6 , of second member 114 is positioned adjacent the concavity of the lower surface of the body 129 of L4 133.
- the wider middle portion W" 6 of each of the members 113 and 114 comprising the body 112 of apparatus 1 10 provides maximal engagement of the concave shaped surface of the body of the vertebrae when the body 112 is rotated by approximately 90° as described below.
- the body 112 may also be advantageous to "pre-adjust" the body 112 by advancing the second member 1 14 to the second position by the amount of the misalignment before inserting the body 112 of apparatus 1 10 into the disk space.
- the amount of slippage of L4 133 relative to L5 137 is calculated using known methods and/or estimated from X-ray films or other images.
- first and second members 113 and 114 are approximately aligned with each of the adjacent vertebrae 133 and 137 by positioning the wide, middle portion of each member in the respective concavities of the vertebrae, using the barrel 1 18 of handle 1 1 1, the body 112 of apparatus 110 is rotated by approximately 90° to cause the teeth 138 formed on the surfaces 134 of first and second members 1 13 and 1 14 to engage the bodies 129 and 131 of the respective adjacent vertebrae 133 and 137 as shown in Fig. 11.
- mandrel 117 is then rotated in the opposite direction to draw second member 114 back into the first, side-by-side, parallel relationship with first member 113, pulling the vertebrae to which it is engaged, i.e., L4 133, back into alignment with L5 137.
- the diskectomy and laminotomy are preferably performed bilaterally.
- the above-described surgical procedure is performed to the side of the center line of the adjacent vertebrae such that the portion of the intervertebral disk which is removed is "off center' " relative to the bodies 129 and 131 of the respective adjacent vertebrae 133 and 137.
- An identical surgery is performed on the other, or second, side of the center line of the adjacent vertebrae and the body 112 of a second apparatus 1 10 (not shown in the figures for purposes of clarity) is inserted into the disk space after that second procedure.
- the adjacent vertebrae 133 and 137 are then aligned by rotation of the respective adjustment knobs 124 of both apparatus 110 until the vertebrae are aligned. In this fashion, the body 1 12 of one of the two apparatus 1 10 retains the adjacent vertebrae in alignment even after removal of the other implant.
- Removal of the body 1 12 is accomplished by rotation by approximately 90° (preferably in the direction opposite the direction of rotation which was utilized to cause the teeth 138 to engage the respective adjacent vertebrae 133 and 137) so as to disengage the teeth 138 from L4fl33 and L5 137. While the body of the second apparatus remains in the disk space on the second side of the center line, an implant such as the implant 22 (see Figs.
- the applicator 52 is detached from the implant 22 by unscrewing and backed out of the incision.
- Lock 24 is then inserted through that same incision and, using the slot 46 and key 48, the bore 28 in lock 24 and bore 30 in implant 22 are aligned and the bolt 26 is inserted and tightened to secure lock 24 to the implant 22 all as previously described.
- the disk space is then packed with cancellous bone chips through this second side and a second monolithic implant 22 (also not shown) is inserted, positioned, rotated, and locked in its place in the same manner as described above. If necessary, a small amount of a siologically compatible adhesive of a type known in the art is applied over the cancellous bone chips just medial to the implants to close off the remaining portion of the openings into the disk space.
- FIG. 12 and 13 there is shown an alternative embodiment of the spondylolisthesis reduction apparatus, indicated generally at reference numeral 1 10a, of the present invention.
- the component parts of apparatus 1 10a are labelled with the reference numeral (and the "a" designation) of the corresponding parts of the apparatus 110.
- Apparatus 110a is comprised of a handle I l ia and body 112a, the body 112a being comprised of first (fixed) and second (movable) members 113a and 114a, respectively.
- the second member 114a is mounted to a mandrel 117a positioned in a longitudinal bore 116a in the shaft 115a b ⁇ a swivel joint 140a and moves relative to first member 113a by action of the threads 121a formed on the outside surface of mandrel 117a on the threads 120a formed on the shaft 115a of handle I l ia.
- the body 112a of apparatus 110a is shaped in the same substantially rectangular cross-sectional shape as the body 112 of apparatus 1 10 and the component parts of apparatus 110a function in the same manner as the parts of apparatus 110.
- Apparatus 110a also includes a plurality of fine serrations 142a formed on the opposed surfaces 144a and 146a of first and second members 113a and 114a, respectively.
- the serrations 142a act to resist longitudinal movement of second member 1 14a relative to first member 113a.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP50151497A JP3761196B2 (en) | 1994-03-18 | 1996-06-06 | Intervertebral disk stabilizer and spondylolisthesis reduction device |
DE69623616T DE69623616T2 (en) | 1994-03-18 | 1996-06-06 | LUMBAR STABILISATOR |
EP96918186A EP0830116B1 (en) | 1994-03-18 | 1996-06-06 | Intervertebral disk stabilizer |
AU60900/96A AU6090096A (en) | 1994-03-18 | 1996-06-06 | Intervertebral disk stabilizer and instrument for reduction of spondylolisthesis |
CA002222025A CA2222025C (en) | 1994-03-18 | 1996-06-06 | Intervertebral disk stabilizer and instrument for reduction of spondylolisthesis |
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/210,229 US6093207A (en) | 1994-03-18 | 1994-03-18 | Middle expanded, removable intervertebral disk stabilizer disk |
US08/475,211 | 1995-06-07 | ||
US08/475,211 US5658336A (en) | 1994-03-18 | 1995-06-07 | Rotating, locking, middle-expanded intervertebral disk stabilizer |
US08/482,974 | 1995-06-07 | ||
US08/482,974 US5697977A (en) | 1994-03-18 | 1995-06-07 | Method and apparatus for spondylolisthesis reduction |
Publications (2)
Publication Number | Publication Date |
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WO1996040016A2 true WO1996040016A2 (en) | 1996-12-19 |
WO1996040016A3 WO1996040016A3 (en) | 1997-02-13 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/US1996/009114 WO1996040016A2 (en) | 1994-03-18 | 1996-06-06 | Intervertebral disk stabilizer and instrument for reduction of spondylolisthesis |
Country Status (9)
Country | Link |
---|---|
US (1) | US5653762A (en) |
EP (1) | EP0830116B1 (en) |
JP (1) | JP3761196B2 (en) |
CN (1) | CN1134243C (en) |
AU (1) | AU6090096A (en) |
CA (1) | CA2222025C (en) |
DE (1) | DE69623616T2 (en) |
ES (1) | ES2182985T3 (en) |
WO (1) | WO1996040016A2 (en) |
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Also Published As
Publication number | Publication date |
---|---|
MX9709599A (en) | 1998-10-31 |
AU6090096A (en) | 1996-12-30 |
CN1134243C (en) | 2004-01-14 |
CN1192669A (en) | 1998-09-09 |
WO1996040016A3 (en) | 1997-02-13 |
CA2222025C (en) | 2007-11-27 |
US5653762A (en) | 1997-08-05 |
DE69623616T2 (en) | 2003-05-15 |
JPH11510405A (en) | 1999-09-14 |
EP0830116A2 (en) | 1998-03-25 |
DE69623616D1 (en) | 2002-10-17 |
JP3761196B2 (en) | 2006-03-29 |
EP0830116B1 (en) | 2002-09-11 |
CA2222025A1 (en) | 1996-12-19 |
ES2182985T3 (en) | 2003-03-16 |
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