CA2578947A1 - Dual rod cross connectors and inserter tools - Google Patents

Dual rod cross connectors and inserter tools Download PDF

Info

Publication number
CA2578947A1
CA2578947A1 CA002578947A CA2578947A CA2578947A1 CA 2578947 A1 CA2578947 A1 CA 2578947A1 CA 002578947 A CA002578947 A CA 002578947A CA 2578947 A CA2578947 A CA 2578947A CA 2578947 A1 CA2578947 A1 CA 2578947A1
Authority
CA
Canada
Prior art keywords
rod
cross connector
spinal
locking mechanism
elongate body
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
CA002578947A
Other languages
French (fr)
Other versions
CA2578947C (en
Inventor
Daniel Huan Kim
Michael Carl Michielli
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
DePuy Spine LLC
Original Assignee
Depuy Spine, Inc.
Daniel Huan Kim
Michael Carl Michielli
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 Depuy Spine, Inc., Daniel Huan Kim, Michael Carl Michielli filed Critical Depuy Spine, Inc.
Publication of CA2578947A1 publication Critical patent/CA2578947A1/en
Application granted granted Critical
Publication of CA2578947C publication Critical patent/CA2578947C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7049—Connectors, not bearing on the vertebrae, for linking longitudinal elements together
    • A61B17/705—Connectors, not bearing on the vertebrae, for linking longitudinal elements together for linking adjacent ends of longitudinal elements
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7049—Connectors, not bearing on the vertebrae, for linking longitudinal elements together
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7074—Tools specially adapted for spinal fixation operations other than for bone removal or filler handling
    • A61B17/7083—Tools for guidance or insertion of tethers, rod-to-anchor connectors, rod-to-rod connectors, or longitudinal elements

Abstract

An implantable spinal cross connector is provided for connecting one or more spinal fixation devices, and more preferably for connecting two spinal fixation rods that are implanted within a patient's spinal system. In general, an exemplary cross connector in accordance with the present invention includes an elongate body with at least one rod-receiving recess formed therein, and a locking mechanism that is adapted to couple to the elongate body and that is effective to lock a spinal fixation rod within the rod-receiving recess(es).
The present invention also provides an inserter tool to facilitate implanting a spinal implant or device, such as a spinal cross connector.

Claims (42)

1. An implantable spinal cross connector, comprising:
an elongate body having a central portion and opposed first and second ends;
at least one rod-receiving recess formed adjacent to at least one of the first and second opposed ends of the elongate body;
at least one rod-engaging member slidably disposed within the elongate body;
and a locking mechanism adapted to be received within the central portion of the elongate body and effective to apply a force to the at least one slidable rod-engaging member to cause the at least one rod-engaging member to lock at least one spinal fixation rod within the at least one rod-receiving recess.
2. The implantable spinal cross connector of claim 1, wherein the locking mechanism is adapted to apply a force to the at least one rod-engaging member to cause the at least one rod-engaging member to slide linearly.
3. The implantable spinal cross connector of claim 1, wherein the central portion includes a central bore formed therein and adapted to receive the locking mechanism.
4. The implantable spinal cross connector of claim 3, wherein the locking mechanism includes a proximal portion that is adapted to engage a proximal portion of the central bore in the elongate body, and a distal shaft extending distally from the proximal portion and adapted to apply a force to the at least one rod-engaging member.
5. The implantable spinal cross connector of claim 4, wherein an internal surface of the at least one rod-engaging member that faces the central bore contours a geometry of the shaft of the locking mechanism.
6. The implantable spinal cross connector of claim 4, wherein the distal shaft tapers in a distal direction.
7. The implantable spinal cross connector of claim 6, wherein an internal surface of the at least one rod-engaging member that faces the central bore is substantially concave to seat the tapered shaft of the locking mechanism.
8. The implantable spinal cross connector of claim 4, wherein the distal shaft is spherical.
9. The implantable spinal cross connector of claim 4, wherein the central bore includes threads formed therein for mating with corresponding threads formed on the proximal portion of the locking mechanism.
10. The implantable spinal cross connector of claim 9, wherein the threads in the central bore and the threads on the proximal portion of the locking mechanism are sized to allow minor motion of the locking mechanism within the central bore.
11. The implantable spinal cross connector of claim 1, wherein the elongate body includes first and second slidable rod-engaging member disposed therein and adapted to at least partially extend into first and second rod-receiving recesses to lock a spinal fixation element within each recess.
12. The implantable spinal cross connector of claim 11, wherein the elongate body includes a central bore formed therein for receiving the locking mechanism, and first and second rod-engaging member receiving cavities that extend between the central bore and the first and second rod-receiving recesses for slidably seating the first and second rod-engaging members.
13. The implantable spinal cross connector of claim 12, further comprising first and second pin members extending through the elongate.body and into a groove formed within the first and second rod-engaging members to slidably retain the rod-engaging members within the rod-engaging member receiving cavities.
14. The implantable spinal cross connector of claim 13, wherein the first and second pin members are effective to allow slidable movement of the first and second rod-engaging members between a first retracted position in which the rod-engaging members are substantially positioned toward the central bore, and a second extended position in which the rod-engaging members are substantially positioned toward the rod-receiving recess.
15. The implantable spinal cross connector of claim 11, wherein the rod-engaging members include a top portion that has a width that is less than a width of a bottom portion such that the bottom portion of each rod-engaging member extends further into the rod-receiving recess than the top portion of each rod-engaging member.
16. The implantable spinal cross connector of claim 3, wherein the at least one rod-receiving recess is formed in a bottom surface of the elongate body and the central bore is formed in an opposed top surface of the elongate body.
17. The implantable spinal cross connector of claim 1, wherein the at least one rod-receiving recess has a shape that is adapted to seat a substantially cylindrical spinal fixation rod.
18. The implantable spinal cross connector of claim 1, wherein the elongate body includes a first rod-receiving recess formed substantially adjacent to a first terminal end thereof, and a second rod-receiving recess formed substantially adjacent to a second terminal end thereof.
19. An implantable spinal cross connector, comprising:
an elongate body having a central portion and first and second rod-receiving recesses formed substantially adjacent to opposed terminal ends of the connector member;
first and second rod-engaging members disposed within the elongate body; and a single locking mechanism matable to the central portion of the connector member and effective to linearly move the first and second rod-engaging members to lock first and second spinal fixation elements within the first and second recesses formed in the connector member.
20. The implantable spinal cross connector of claim 19, wherein the elongate body includes a central opening formed therein for receiving the locking mechanism.
21. The implantable spinal cross connector of claim 20, wherein the first rod-engaging member extends between the central opening and the first rod-receiving recess, and the second rod-engaging member extends between the central opening and the second rod-receiving recess, and wherein the locking mechanism is effective to apply a force to the first and second rod-engaging members when the locking mechanism is disposed within the central opening to linearly move the first and second rod-engaging members to lock first and second spinal fixation elements within the first and second rod-receiving recesses.
22. The implantable spinal cross connector of claim 21, wherein the first and second rod-engaging members are slidably disposed within first and second cavities formed within the elongate body and extending between the central opening and the first and second rod-receiving recesses.
23. The implantable spinal cross connector of claim 22, further comprising a first pin member extending through the elongate body and into a groove formed within the first rod-engaging member, and a second pin member extending through the elongate body and into a groove formed within the second rod-engaging member, the first and second pin members being effective to allow controlled slidable movement of the first and second rod-engaging members within the first and second cavities.
24. The implantable spinal cross connector of claim 22, wherein the first and second rod-engaging members are movable between a first retracted position in which the rod-engaging members are substantially disposed within the first and second cavities in the elongate body, and a second extended position in which at least a portion of the rod-engaging members extend into the rod-receiving recesses formed within the elongate body.
25. The implantable spinal cross connector of claim 21, wherein the locking mechanism includes a threaded proximal portion that is adapted to mate to corresponding threads formed within a central opening formed in the central portion of the elongate body, and a shaft extending distally from the threaded proximal portion and adapted to apply a force to the first and second rod-engaging members.
26. The implantable spinal cross connector of claim 25, wherein an internal surface of the first and second rod-engaging members that faces the central bore contours a geometry of the shaft of the locking mechanism.
27. The implantable spinal cross connector of claim 25, wherein the shaft tapers in a distal direction.
28. The implantable spinal cross connector of claim 27, wherein an internal surface of the first and second rod-engaging members that faces the central opening is substantially concave to seat the tapered shaft of the locking mechanism.
29. The implantable spinal cross connector of claim 21, wherein the first and second rod-engaging members include an external surface that faces the rod-receiving recess in the elongate body and that is substantially planar and extends at an angle such that a bottom portion of the first and second rod-engaging members has a width that is greater than a width of a top portion of the first and second rod-engaging members.
30. The implantable spinal cross connector of claim 19, wherein the elongate body has a length extending between the terminal ends that is in the range of about 10 mm to 30 mm.
31.An implantable spinal cross connector, comprising:
an elongate body having first and second rod-receiving recesses formed substantially adjacent to opposed first and second terminal ends therein, a first slidable rod-engaging member that is adapted to extend into the first rod-receiving recess, a second slidable rod-engaging member that is adapted to extend into the second rod-receiving recess; and a locking mechanism that is receivable within the elongate body and that is effective to apply a force to the first and second rod-engaging members to cause the first and second rod-engaging members to slide into the first and second rod-receiving recesses to engage and lock a spinal fixation element disposed therein.
32.The implantable spinal cross connector of claim 31, wherein the elongate body includes a central opening formed therein for receiving the locking mechanism.
33. The implantable spinal cross connector of claim 32, wherein the first and second slidable rod-engaging members are slidably disposed within first and second cavities that extend between the central opening and the first and second rod-receiving recesses.
34. The implantable spinal cross connector of claim 33, wherein the locking mechanism includes a proximal portion having threads formed thereon for mating with corresponding threads formed within the central opening.
35.The implantable spinal cross connector of claim 34, wherein the locking mechanism includes a shaft that extends distally from the proximal portion and that is adapted to extend into the central opening to apply a force to the first and second rod-engaging members to cause the first and second rod-engaging members to engage and lock a spinal fixation element within the first and second rod-receiving recesses.
36. A method for connecting first and second spinal fixation rods, comprising:

coupling first and second spinal fixation rods to one or more vertebrae in a patient's spinal column;
positioning a spinal cross connector relative to the first and second spinal fixation rods such that the first spinal fixation rod is seated within a first rod-receiving recess in the spinal cross connector and the second spinal fixation rod is seated within a second rod-receiving recess in the spinal cross connector; and applying a single locking mechanism to the spinal cross connector to cause first and second rod-engaging members to move linearly to lock each of the first and second spinal fixation rods within the first and second rod-receiving recesses.
37. The method of claim 36, wherein the spinal cross connector includes a central opening formed therein for receiving the locking mechanism.
38. The method of claim 37, wherein the first and second rod-engaging members extend between the central opening and the first and second rod-receiving recesses.
39. The method of claim 36, wherein the step of applying a locking mechanism to the spinal cross connector comprises threading a locking mechanism into a central bore formed in the spinal cross connector.
40. An inserter tool for positioning a cross connector in relation to one or more spinal fixation elements implanted in a patient's spinal column, the inserter tool comprising:
a hollow elongate shaft having a proximal handle end and a distal end including first and second opposed arms that define a cavity therebetween for receiving at least a portion of spinal implant, the first and second arms each including a flexible portion that is adapted to engage a spinal implant positioned between the arms.
41. The inserter tool of claim 40, further comprising at least one window formed in the elongate shaft proximal to the distal end for viewing a spinal implant positioned between the first and second arms.
42. A medical device kit, comprising:
a cross connector that is adapted to couple to at least one spinal fixation device, the cross connector including a locking mechanism that is effective to lock the cross connector in a fixed position with respect to the at least one spinal fixation device; and an inserter tool having a hollow elongate shaft with a distal end that is adapted to seat at least a portion of the cross connector for manipulating the cross connector to position it in relation to at least one spinal fixation device implanted in a patient's spinal column.
CA2578947A 2004-08-27 2005-06-22 Dual rod cross connectors and inserter tools Expired - Fee Related CA2578947C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US10/929,095 2004-08-27
US10/929,095 US7717938B2 (en) 2004-08-27 2004-08-27 Dual rod cross connectors and inserter tools
PCT/US2005/021794 WO2006025919A2 (en) 2004-08-27 2005-06-22 Dual rod cross connectors and inserter tools

Publications (2)

Publication Number Publication Date
CA2578947A1 true CA2578947A1 (en) 2006-03-09
CA2578947C CA2578947C (en) 2010-08-17

Family

ID=36000473

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2578947A Expired - Fee Related CA2578947C (en) 2004-08-27 2005-06-22 Dual rod cross connectors and inserter tools

Country Status (7)

Country Link
US (3) US7717938B2 (en)
EP (1) EP1781194B1 (en)
JP (1) JP4902539B2 (en)
AT (1) ATE538739T1 (en)
AU (1) AU2005280613B2 (en)
CA (1) CA2578947C (en)
WO (1) WO2006025919A2 (en)

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US7717938B2 (en) 2010-05-18
ATE538739T1 (en) 2012-01-15
EP1781194A4 (en) 2009-04-08
WO2006025919A3 (en) 2006-05-11
WO2006025919A2 (en) 2006-03-09
US20130131727A1 (en) 2013-05-23
US20090036928A1 (en) 2009-02-05
EP1781194B1 (en) 2011-12-28
AU2005280613B2 (en) 2011-07-14
US8372119B2 (en) 2013-02-12
EP1781194A2 (en) 2007-05-09
JP4902539B2 (en) 2012-03-21
JP2008511386A (en) 2008-04-17
CA2578947C (en) 2010-08-17
AU2005280613A1 (en) 2006-03-09
US8961572B2 (en) 2015-02-24
US20060058789A1 (en) 2006-03-16

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