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WO1997031580A1 - Dispositif pour relier des tiges adjacentes dans des systemes d'implants de la colonne vertebrale - Google Patents

Dispositif pour relier des tiges adjacentes dans des systemes d'implants de la colonne vertebrale Download PDF

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Publication number
WO1997031580A1
WO1997031580A1 PCT/US1997/003312 US9703312W WO9731580A1 WO 1997031580 A1 WO1997031580 A1 WO 1997031580A1 US 9703312 W US9703312 W US 9703312W WO 9731580 A1 WO9731580 A1 WO 9731580A1
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WO
WIPO (PCT)
Prior art keywords
members
connector
engaging
longitudinal
thru
Prior art date
Application number
PCT/US1997/003312
Other languages
English (en)
Inventor
Troy Drewry
Michael C. Sherman
James E. Van Hoeck
Denis S. Drummond
David L. Brumfield
M. Neil Anderson
Original Assignee
Sdgi Holdings, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sdgi Holdings, Inc. filed Critical Sdgi Holdings, Inc.
Priority to AU20646/97A priority Critical patent/AU2064697A/en
Publication of WO1997031580A1 publication Critical patent/WO1997031580A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • 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 or setting implements
    • 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, e.g. stabilisers comprising fluid filler in an implant
    • A61B17/7049—Connectors, not bearing on the vertebrae, for linking longitudinal elements together
    • A61B17/7052—Connectors, not bearing on the vertebrae, for linking longitudinal elements together of variable angle or length

Definitions

  • the present invention broadly concerns devices for use in spinal implant systems, particularly those using spinal rods contoured for connection at various locations along the length of the spinal column. More specifically, the invention concerns an apparatus for linking adjacent spinal rods in a top-loading and top-tightening fashion. This invention is particularly useful with methods and devices for posterior fixation of the spine.
  • a pair of bendable rods are longitudinally disposed adjacent the vertebral column and are fixed to various vertebrae along the length of the spine by way of a number of fixation elements, such as hooks and screws.
  • TSRH® CROSSLINK® of Danek Medical, Inc.
  • the TSRH® CROSSLINK® utilizes a three point shear clamp mechanism which restricts motion between the rods in all directions, and particularly resists axial forces between rods and torsional moments about the axis of the rods.
  • a quadrilateral construct is formed by laterally connecting the rods across the sagittal plane with rigid plates. The lateral connection reduces the loss of correction that can occur over time.
  • Rigid transverse connections between spinal rods are beneficial because they restrict rod migration and increase construct stiffness. In many cases involving multi-level fusion of the spine, these features are essential while solid bone fusion is accomplished. In the post-operative period before fusion occurs, a significant amount of motion can occur between the rods, wires and hooks, which can, for example, allow a scoliotic correction to decrease or the pelvis to de-rotate toward its previous, deformed position. By providing a rigid transverse connection between two spinal rods, the loss of correction can be reduced and a stiffer construct can be created which may enhance the promotion of a solid fusion.
  • a connector for linking adjacent longitudinal members, such as spinal rods, engaged to a spine.
  • the apparatus includes a bridge member sized to span at least a portion of the distance between the spinal rods.
  • a pair of engaging members are connected to the bridge member, each including a receptacle configured to receive a longitudinal member when the connector is disposed over the adjacent rods.
  • the engaging members also include a fixation surface adjacent to the receptacle and configured for engaging a longitudinal member, and a thru-hole defined in the engaging member adjacent to the receptacle for receiving a wedge member.
  • the thru-hole intersects the receptacle and is aligned at an angle such that as the wedge member is advanced through the thru-hole, the wedge member will bear against a rod initially disposed in the receptacle and push the rod against the fixation surface to engage the connector to the rod.
  • the engaging members include an elongated connecting portion which is received by a bore in the bridge member.
  • the bridge member also includes a pair of engaging surfaces adjacent to and contiguous with a respective one of the bores for engaging a connecting portion.
  • a second thru-hole defined in the bridge member intersects each one of the bores and is aligned at an angle such that as a wedge member is advanced through the second thru-hole, the wedge member will bear against the connecting portions and push each one against a corresponding one of the engaging surfaces.
  • the bridge member defines a slot for receiving one of the connecting portions and a first fastener bore which intersects the slot.
  • the connecting portion also defines a second fastener bore which is alignable with the first fastener bore of the bridge member when the connecting portion is inserted into the slot.
  • the fixation surface includes a circular concavity which has a smaller radius than the radius of the longitudinal member. This provides three points of contact on each of the longitudinal members which restricts motion between the rods in all directions.
  • One advantage of a preferred embodiment of this invention is that it provides fixation assemblies that can be top loaded, or implanted over spinal rods after the spinal rods have been engaged to the spinal column. A further benefit is achieved by top-tightening aspects of the invention.
  • Another benefit of this invention is that a preferred embodiment provides three points of contact on the spinal rod which restricts rod migration and increases overall construct rigidity.
  • FIG. 1 is a top elevational view of a spinal fixation system engaged to a spine according to one aspect of this invention.
  • FIG. 2 is a top elevational view of a transverse connector engaged to spinal rods wherein the engaging members are disposed medially and the thru-holes are disposed laterally on the connector.
  • FIG. 3 is a cross-section of the transverse connector of FIG. 2.
  • FIG. 4 is a cross-sectional view of the transverse connector of FIG. 2 which is top loaded over two spinal rods .
  • FIG. 5 is a cross-sectional view of the transverse connector of FIG. 2 engaged to two spinal rods.
  • FIG. 6 is a side elevational view of a set screw.
  • FIG. 7 is a top elevational view of a set screw.
  • FIG. 8 is a top elevational view of a transverse connector similar to FIG. 1 except that the engaging members are disposed laterally and the thru-holes are disposed medially on the connector.
  • FIG. 9 is a side elevational view of the transverse connector of FIG. 8.
  • FIG. 10 is a side elevational view of an alternative embodiment of a transverse connector.
  • FIG. 11 is a top elevational view of a closed transverse connector embodiment.
  • FIG. 12 is a side elevational view of the transverse connector of FIG. 11.
  • FIG. 13 is a top elevational view of an adjustable transverse connector.
  • FIG. 14 is a side elevational view of the transverse connector of FIG. 13.
  • FIG. 15 is a cross-sectional view of the connector of FIG. 13 taken along lines 15-15.
  • FIG. 16 is a top elevational view of another adjustable transverse connector.
  • FIG. 17 is a side elevational view of the bridge member of the transverse connector shown in FIG. 16.
  • FIG. 18 is a side elevational view of an alternative embodiment of the transverse connector having shortened connecting portions.
  • FIG. 19 is a perspective view of still another adjustable transverse connector according to this invention.
  • FIG. 20 is a side elevational view of the transverse connector shown in FIG. 19.
  • FIG. 21 is an exploded side view of the transverse connector of FIG. 19.
  • FIG. 22 is a perspective view of still another transverse connector of this invention.
  • FIG. 23A is a perspective view of another adjustable connector according to this invention in an extended configuration.
  • FIG. 23B is a perspective view of the adjustable connector of FIG. 23A in a closed configuration.
  • FIG. 24A is a side elevational view of the connector shown in FIG. 23A.
  • FIG. 24B is a side elevational view of the connector shown in FIG. 23B.
  • FIG. 25 is an exploded perspective view of the connector shown in FIGS. 23 and 24.
  • FIG. 26 is an exploded side elevational view of the connector shown in FIGS. 23 and 24.
  • FIG. 27 is a bottom elevational view of the first engaging member and bridge member of the connector shown in FIGS. 23-26.
  • FIG. 28 is a bottom elevational view of the second engaging member of the connector shown in FIGS. 23-26.
  • FIG. 29 is a top elevation view of the second engaging member according to one aspect of this invention.
  • FIG. 30 is a front elevational view of the second engaging member shown in FIG. 29. DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • the present invention is useful for posterior internal fixation of the spine which is indicated for correcting and stabilizing spinal curvatures and for facilitating spinal fusion in the case of spinal disorders or degenerative conditions.
  • This invention provides a top-loaded, top-tightening, low profile posterior fixation system which requires minimal instrumentation yet provides a stable, rigid quadrilateral construct that restricts rod migration and increases overall construct rigidity.
  • FIGS. 1-3 A spinal fixation system 10 in accordance with one preferred embodiment of the present invention is depicted in FIGS. 1-3.
  • the system 10 includes a pair of longitudinal members, preferably spinal rods, 11,12 means for engaging the longitudinal members to the vertebral column, 13, 14, a pair of wedge members 16 and a connector 20 configured to span a distance between the rods 11, 12 when the rods 11, 12 are engaged to the spine.
  • the connector 20 includes a pair of engaging members 25, 26 each defining a fixation surface 33 at a corresponding first end 28 thereof.
  • the connector 20 also includes a connecting surface 30 at a second end 29 of each engaging member 25, 26.
  • a bridge member 21 includes a first end 22 and a second end 23 which are attached to the connecting surfaces 30 of each of the rod engaging members 25, 26.
  • the bridge member 21 preferably includes a reduced width and depth portion 24 to avoid the laminae and spinous process remnant during the surgical procedure.
  • the reduced portion 24 also provides means for contouring or bending the connector 20 as needed to conform to the spinal anatomy of the patient.
  • Each of the engaging members 25, 26 further defines a receptable 36 for receiving a spinal rod therein and a first thru-hole 35 for receiving a wedge member 16.
  • the thru-holes 35 intersect the corresponding receptacles 36 and are aligned so that when a wedge member 16 is advanced through the thru-hole 35, the wedge member 16 bears on a corresponding rod 11, 12 within a receptacle 36 to force the rod 11, 12 into contact with an opposite fixation surface 33 to engage the rod to the connector.
  • the engaging members 25, 26 are integrally attached to the bridge member 21.
  • the thru-holes 35 are threaded.
  • One advantage of this invention is that it provides connectors that can be top loaded, or implanted over spinal rods after the spinal rods have been engaged to the vertebrae. Top-loading is advantageous because it reduces the required size of the surgical opening and resulting trauma to the patient, and because it greatly simplifies the surgical implantation. Top-loading also provides a mechanical advantage during implantation of the system in that the connector 20 can be easily placed over adjacent rods 11, 12 and then the rods 11, 12 can be locked laterally relative to each other by tightening the wedge members 16. Referring to FIGS. 3, 4 and 5, the connector 20 can be disposed or loaded over longitudinal members or rods 11, 12 which have been previously engaged to the spine such that the rods 11, 12 are received into the receptacle 36 of the connector 20.
  • the fixation surface 33 is a circular concavity which has a smaller radius than the radius of the rod 11, 12.
  • This configuration provides three points of contact a, b, c on the longitudinal members 11, 12 as shown in FIG. 5. Two points of contact a and b are provided by the fixation surface 33, and the third point of contact c is provided by bearing surface 38 on the wedge member 16.
  • the wedge member 16 is preferably a set screw 37 which has a bearing surface 38 and an internal hex 39 to accept a conventional driving tool.
  • the head 34 of the wedge member 16 or set screw 37 is configured to rest entirely within the thru-hole 35.
  • the set screw 37 can be situated so that it does not extend above the upper surface 31 of the connector 20 when the set screw 37 is fully advanced in the thru-hole 35 and bearing against a rod 12 as shown in FIG. 5.
  • the thru-holes 35 carry corresponding female threads.
  • bearing surface 38 is shaped to conform to an outer surface 17 of a rod 11, 12.
  • the outer surface 17 of the rod 11, 12 is typically circular, but can be of any suitable shape.
  • the bearing surface 38 is preferably a tapered tip 42.
  • the bridge members defines an axis B between the first end 22 and the second end 23 of the bridge member 21.
  • the thru-holes 35 are preferably oriented at an angle A of less than 90° relative to the axis B of the bridge member 21. Any angle which allows the wedge member 16 to bear against a rod 11, 12 in the receptacle 36 and push the rod 11, 12 against the fixation surface 33 so that the adjacent rods 11, 12 are retained in a desired special relationship are contemplated. Such angles include but are not limited to angles of about 40°, 45° and 60°. Preferably the angle is established to preserve the top-tightening aspect of the invention, which can help reduce the size of the surgical site for implantation.
  • the connector 20 includes thru-holes 35 which are disposed laterally on the connector, i.e., laterally outboard from the axis B. In this configuration the thru-holes 35, and therefore the wedge members 16, act toward the axis B.
  • the first thru-holes 44 may be disposed medially on the connector 40, as shown in FIGS. 8 and 9. This embodiment is desirable when the span between the longitudinal members 11, 12 is sufficient to accommodate both wedge members 41.
  • a transverse connector 20 which utilizes laterally disposed wedge members 16 such as depicted in FIGS. 1-5, can be used when the span between the longitudinal members 11 and 12 is smaller than about 1 1/8" (28mm) .
  • the medial connector embodiment 40 is desirable because it permits a smaller surgical site and allows easier access to the wedge members 41 with tools (not shown) for engaging the wedge member 41 during the surgical procedure.
  • this invention also contemplates a C-clamp shaped connector 60.
  • the C-clamp connector 60 also includes a bridge member 62 which spans between a pair of engaging members 67, 68.
  • the bridge member 62 is connected to each of the engaging members 67, 68 at a first end 63 and a second end 64 of the bridge member 62.
  • a pair of receptacles 70 on the connector 60 are configured to receive longitudinal members or rods 11, 12.
  • a first thru-hole 75 is defined in each of the engaging members 67, 68.
  • the thru-holes 75 intersect the corresponding receptacles 70 and are aligned at an angle such that as a wedge member 76 is advanced through the thru-hole 75, the wedge member 76 will bear against the longitudinal member 11, 12 and push the longitudinal member 11, 12 against a fixation surface 71 adjacent to the corresponding receptacles 70 to engage the connector 60 to a longitudinal member 11, 12.
  • the connector 60 can be loaded over a pair of spinal rods 11, 12, with the rods 11, 12 initially in contact with only the receptacles 70 or the underside of the connector 60. The connector can be manually shifted until the rods contact the fixation surfaces 72. Final engagement is accomplished by tightening the wedge members 76 against the rods.
  • Closed connector embodiments are also contemplated by this invention as shown in FIGS. 11 and 12.
  • the closed connector 80 must be preloaded on the longitudinal members 11, 12 before the longitudinal members 11, 12 are engaged to a spinal column.
  • the closed connector 80 includes a bridge member 81 attached to a pair of engaging members 82, 83.
  • a pair of rod receptacles 87 are configured to receive a longitudinal member 11, 12.
  • a first thru-hole 85 is defined in each engaging member 82, 83 for receiving a wedge member 16.
  • the fixation surface 88 is a circular concavity which has a smaller radius than the radius of the longitudinal member 11, 12, thus providing three points of contact as described above.
  • FIGS. 13 and 14 show an adjustable transverse connector 90.
  • the connector 90 includes a bridge member 91 having a first end 92, a second end 93 and engaging members 94, 95.
  • the engaging members 94, 95 each include an engaging portion 96 which define thru-holes 99 and which are engageable to the longitudinal members 11, 12 as described above.
  • Each engaging member 94, 95 also includes elongated connecting portions 97, 98 sized to span at least a portion of the distance between the adjacent longitudinal members or rods 11, 12.
  • the bridge member 91 defines a pair of bores 101, each for receiving a corresponding one of the elongated connecting portions 97, 98.
  • the bridge member also includes a pair of engaging surfaces 102 which are adjacent to and contiguous with a respective one of the bores 101 for engaging the corresponding connecting portions 97,98, as shown in FIG. 15.
  • a pair of second thru-holes 105 are defined in the bridge member 91 for receiving wedge members 106.
  • a second thru-hole 105 intersects each of the bores 101 and is aligned at an angle such that as the wedge member 106 is advanced through the second thru-hole 105, the wedge member 106 will bear against the corresponding connecting portion 97, 98 and push each of the connecting portions 97, 98 against a corresponding one of the engaging surfaces 102.
  • the engaging surfaces 102 include a circular concavity which has a smaller radius than a radius of the bore 101 and of the circular connecting portions 97, 98.
  • FIGS. 16 and 17 One preferred embodiment of an adjustable transverse connector 120 which is similar to the embodiment shown in FIGS. 13-15 is shown in FIGS. 16 and 17.
  • a single second thru-hole 135 defined in the bridge member 123 intersects both of the bores 130, 140 so that a single wedge member 129 engages both of the connecting portions 126, 127 as shown in FIGS. 16 and 17.
  • a single wedge member 129 forces the connecting portions 126 and 127 laterally into the respective engaging surfaces 131, 141.
  • Each engaging surface 131, 141 includes a concavity 142, 132 which has a centroid 138, 148. As shown in FIG.
  • connectors of various sizes are contemplated.
  • the connector 110 shown in FIG. 18 provides shortened connecting portions 112 connected to a bridge member 111.
  • a telescoping adjustable transverse connector 150 includes a bridge member 152 connected to a first engaging member 155 and a second engaging member 162, each having a respective first end 156, 163 and second end 158, 165.
  • the engaging members 155, 162 each include fixation portions 157, 164 at the first end 156, 163.
  • the fixation portions 5 157, 164 each include receptacles 168, 169 and fixation surfaces 170, 171.
  • the receptacles 168, 169 are each intersected with a first thru-hole 175 for receiving a wedge member 241.
  • the thru-holes 175 are aligned so that when a corresponding wedge member is advanced through the thru-hole 0 175, the bearing surface 242 of the wedge member 241 bears on a corresponding longitudinal member within the receptable 168, 169 to force the longitudinal member into contact with the corresponding fixation surface 170, 171.
  • the thru-holes 175 are threaded.
  • the fixation portions 157, 164 of the connector 150 are engageable to longitudinal members in a top loaded fashion in the manner described above.
  • the device defines an axis B' between the first ends 156 and 163.
  • the thru-holes 175 are preferably oriented at an angle o A' of less than 90° relative to the axis B' .
  • any angle is contemplated which allows a wedge member to bear against a longitudinal member in one of the receptacles 168 or 169 and push the longitudinal member against the corresponding fixation surface 170 or 171, respectively, so 5 that the longitudinal member is retained in a desired special relationship.
  • Such angles include but are not limited to angles of about 40°, 45° and 60°.
  • the angle is established to preserve the top-tightening aspect of the invention, which can help reduce the size of the 0 surgical site for implantation.
  • the connector 150 includes thru-holes 175 which are disposed laterally on the connector, i.e., laterally outboard from the axis B'. In this configuration the thru-holes 175, and therefore the wedge members, act toward the axis B' .
  • the thru-holes may be disposed medially on a connector 200, such as thru holes 225 as shown in FIGS. 23A through 30. This embodiment is desirable when the span between the longitudinal members is sufficient to accommodate both wedge members 241.
  • a transverse connector 150 which defines laterally disposed thru-holes 175 such as depicted in FIGS. 19-22, can be used when the span between the longitudinal members need to be smaller than about 1
  • a medial connector embodiment 200 is desirable because it permits a smaller surgical site and allows easier access to the wedge members 241 with tools (not shown) for engaging the wedge members 241 during the surgical procedure.
  • the first engaging member 155, 205 of the connectors 150, 200 shown in FIGS. 19-30 include a first connecting portion 159, 209 at the second end 158, 208.
  • the second engaging members 162, 212 of these connectors 150, 200 similarly include a second connecting portion 166, 216 at the second ends 165, 215.
  • the bridge member 152, 202 of the connectors 150, 200 each define a slot 153, 203 for receiving a second connecting portion 166, 216.
  • the first connecting portion 159, 209 of the first engaging member 155, 205 is preferably integrally attached to the bridge member 152, 202.
  • the bridge member 152, 202 also preferably defines a first fastener bore 177, 227. (FIG. 25)
  • the axis D of the first fastener bore 177 intersects the slot 153 for receiving a fastener 180 to connect the second connecting portion 166 to the bridge member 152.
  • the second connecting portion 166 defines a second fastener bore 178.
  • the second fastener bore 178 is alignable with the first fastener bore 177 when the second connecting portion 166 is inserted in the slot 153.
  • a fastener 180 is extendable through each of the first and second fastener bores 177, 178 to clamp the second connecting portion 166 to the bridge member 152.
  • Any suitable fastener is contemplated, including but not limited to a hex head screw 180 with an integral washer 181.
  • the fastener may also include a locking screw 228 having a circular head 229 with an internal hex recess 230 to receive a driving tool, as shown in FIG. 25.
  • the first fastener bore 177, 227 of the bridge member 152, 202 includes a recess 179, 229 defined in an upper surface 154, 204 of the connector 150, 200 as shown in FIGS. 22 and 23A.
  • the head 182, 232 of the fastener 180 can be sized to be received within the recess 179, 229 without extending substantially above the upper surface 154 of the bridge member 152.
  • This embodiment provides a low profile system.
  • a fastener having a circular head 232 and an internal hex 230 such as the locking screw 228 depicted in FIG. 25 is preferred for this configuration.
  • the bridge member in one embodiment shown in FIG. 19, the bridge member
  • the second connecting portion 166 is slidable within the slot
  • the second connecting portion 166 includes an area of reduced width 167 for bending and contouring the connector 150.
  • the fastener is a locking screw 230 having a flat bearing surface 234.
  • the second connecting portion 216 preferably has a circular cross-section interrupted by a flat upper surface 233 as shown in FIGS. 25 and 29-30. The action of the flat bearing surface 234 of the locking screw 230 on the flat upper surface 233 of the second connecting member 216 locks the first and second engaging members 205 and 212 together and thereby links the adjacent longitudinal member in a desired spatial relationship.
  • the connectors are provided with provisional connecting means for maintaining the first engaging member 205 and the second engaging member 212 in slidable engagement.
  • the provisional connecting means allows the connector 200 to range from a fully extended length EL as shown in FIGS. 23A, 24A to a fully closed length EL as shown in FIGS. 23B, 24B.
  • This provisional means keeps the first and second engaging members 205, 212 in sliding engagement until the surgeon has top loaded the connector 200 over the longitudinal members and fixed the distance between the first and second engaging members 205, 212 with a fastener, such as lock screw 230.
  • This provisional means reduces fiddle factor because the surgeon is able to adjust the distance between the receptacles 218 and 219 to accommodate the distance between longitudinal members implanted on the spine without having to assemble the connector 200 during the surgery.
  • the provisional means includes a pin and groove arrangement.
  • a groove 251 is defined in the lower surface 250 of the bridge member 202 as shown in FIGS. 26 and 27.
  • the groove 251 is of sufficient width that a pin 255 attached to the lower surface 217 of the second connecting portion 216 will slide within the groove 251.
  • the pin 255 operates to keep the two members 205 and 212 connected as the connector 200 is manipulated to seat on the spinal rods.
  • the pin 255 is engageable or connected to the second connecting portion 216 of the second engaging member 212 in any suitable manner.
  • the pin 255 is connected to the second connecting portion 216 by insertion of the pin 255 into a pin hole 258 defined in the lower surface 217 second connecting portion 216 as depicted in FIGS. 25 and 26. Most preferably, the pin 255 is press fit through the groove 251 and into the pin hole during the manufacture of the connector 200 shown in FIG. 28.
  • the provisional means could be assembled by the surgeon or a technician just prior or during the surgery.
  • the total expanded length EL (FIG. 23A) of the connector is 2.7" (68mm) and the closed length CL (FIG. 23B) is 2.2" (56mm).
  • the distance between the longitudinal members in the expanded configuration is 2.15" (55 mm) and 1.75" (44.5 mm) in the closed configuration.
  • the connectors and systems of this invention are preferably formed of medical grade stainless steel or similar high strength material. Other biocompatible materials are contemplated provided the material is strong enough to endure the high loads transmitted through the components. Specifically, the systems could be manufactured in 6A14V titanium or 316LVM stainless steel.
  • the connectors can be provided in several different sizes as necessary to accommodate the spinal anatomy at the cervical, thoracic and lumbar segments of the spine.
  • the second connecting portion 166, 216 of the connectors 150, 200 shown in FIGS. 19-30 will be shaped and sized to be accommodated by the slot 153, 203 of the bridge member 152, 202.
  • the second connecting portion may have a cross-section which is rectangular as shown in FIG. 19, circular or circular interrupted by a flat surface as shown in FIG. 25. Therefore, it is understood that only the preferred embodiments have been shown and described and that all changes and modifications that come within the spirit of the invention are desired to be protected.

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  • Orthopedic Medicine & Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Neurology (AREA)
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  • Heart & Thoracic Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
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  • Molecular Biology (AREA)
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Abstract

Cette invention se rapporte à un système de fixation de la colonne vertébrale, qui, dans l'un de ses modes de réalisation, comprend une paire d'éléments longitudinaux (11, 12) pouvant se placer à proximité adjacente de la colonne vertébrale, des moyens pour engager les élément longitudinaux à coopérer avec la colonne vertébrale (13, 14), une paire d'éléments en coin (241) comportant chacun une surface d'appui (242) configurée pour venir en appui sur un élément longitudinal (11, 12), et un élément de liaison (200) configuré de façon à occuper la distance comprise entre les éléments longitudinaux (11, 12). L'élément de liaison (200) comprend une paire d'élément d'engagement (205, 212), comportant chacun une partie de fixation (207, 214) et une partie de liaison (209, 216), ainsi que des éléments en pont (202) pouvant être fixés aux parties de liaison (209, 216). Les éléments d'engagement (205, 212) définissent chacun un trou traversant (225) destiné à recevoir l'un des éléments en coin (241). Les trous traversants (225) sont alignés pour que, lorsque l'un des éléments en coin (241) est amené à avancer à travers le trou traversant (225), la surface d'appui (242) vienne en appui sur un élément longitudinal correspondant (11, 12), afin de forcer l'élément longitudinal (11, 12) à entrer en contact avec la surface de fixation (220, 221) et à engager l'élément longitudinal (11, 12) dans l'élément de liaison (200).
PCT/US1997/003312 1996-02-29 1997-02-26 Dispositif pour relier des tiges adjacentes dans des systemes d'implants de la colonne vertebrale WO1997031580A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU20646/97A AU2064697A (en) 1996-02-29 1997-02-26 Device for linking adjacent rods in spinal instrumentation

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US60873396A 1996-02-29 1996-02-29
US08/608,733 1996-02-29

Publications (1)

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WO1997031580A1 true WO1997031580A1 (fr) 1997-09-04

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000015126A1 (fr) * 1998-09-15 2000-03-23 Advanced Spine Fixation Systems, Inc. Connecteur transversal pour systemes de fixation de la colonne vertebrale
JP3091440B2 (ja) 1998-03-03 2000-09-25 株式会社ロバート・リード商会 骨固定装置
WO2002022030A3 (fr) * 2000-09-15 2002-09-06 Sdgi Holdings Inc Systeme de fixation posterieur
US7628799B2 (en) 2005-08-23 2009-12-08 Aesculap Ag & Co. Kg Rod to rod connector
US8348952B2 (en) 2006-01-26 2013-01-08 Depuy International Ltd. System and method for cooling a spinal correction device comprising a shape memory material for corrective spinal surgery

Citations (6)

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FR2645427A1 (fr) * 1989-04-11 1990-10-12 Cotrel Yves Barre de fixation transverse pour dispositif d'osteosynthese rachidienne
US5005562A (en) * 1988-06-24 1991-04-09 Societe De Fabrication De Material Orthopedique Implant for spinal osteosynthesis device, in particular in traumatology
DE4330837A1 (de) * 1993-09-11 1995-03-16 Michael Hahn Pedikelschraube und Fixateur interne
WO1995013754A1 (fr) * 1993-11-19 1995-05-26 Cross Medical Products, Inc. Liaison transversale pour systeme d'implant vertebral
FR2714590A1 (fr) * 1994-01-05 1995-07-07 Lenfant Jean Pierre Dispositif dénommé fixateur transverse permettant de solidariser les tiges dans les opérations du rachis.
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JP3091440B2 (ja) 1998-03-03 2000-09-25 株式会社ロバート・リード商会 骨固定装置
WO2000015126A1 (fr) * 1998-09-15 2000-03-23 Advanced Spine Fixation Systems, Inc. Connecteur transversal pour systemes de fixation de la colonne vertebrale
US6110173A (en) * 1998-09-15 2000-08-29 Advanced Spine Fixation Systems, Inc. Transverse connector for spinal fixation systems
WO2002022030A3 (fr) * 2000-09-15 2002-09-06 Sdgi Holdings Inc Systeme de fixation posterieur
US7628799B2 (en) 2005-08-23 2009-12-08 Aesculap Ag & Co. Kg Rod to rod connector
US8348952B2 (en) 2006-01-26 2013-01-08 Depuy International Ltd. System and method for cooling a spinal correction device comprising a shape memory material for corrective spinal surgery

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