Multi-directional rod reducer instrument and method

• US 8,556,903 B2
• Filed: 03/28/2011
• Issued: 10/15/2013
• Est. Priority Date: 04/11/2006
• Status: Active Grant

• Current Assignee: Warsaw Orthopedic Incorporated (Medtronic Plc)
• Original Assignee: Warsaw Orthopedic Incorporated (Medtronic Plc)
• Inventors: Miller, Keith E., Cline, James L.
• Primary Examiner(s): Robert, Eduardo C
• Assistant Examiner(s): HARVEY, JULIANNA NANCY
• Application Number:
  US13/073,671
• Publication Number:
  US 20110172723A1
• Time in Patent Office: 932 Days
• Field of Search: 606/86.A
• US Class Current: 606/86.A
• CPC Class Codes: A61B 17/7034 characterised by a lateral opening
• CPC Class Codes: A61B 17/7055 connected to sacrum, pelvis or skull
• CPC Class Codes: A61B 17/7088 wherein the rod is moved transverse to the axis of the bone anchor
• CPC Class Codes: A61B 17/86 Pins or screws or threaded wires; nuts therefor A61B17/72 take precedence
• CPC Class Codes: A61B 2017/0042 with special provisions for gripping
• CPC Class Codes: A61B 2017/0046 with a releasable handle; with handle and operating part separable for prosthetic joint-implanting tools A61F2/4603

Abstract

A surgical reducing instrument is used to position an elongated implant element in a desired position relative to one or more of the bone anchors of a spinal implant system. The reducing instrument includes a mounting member that is mounted to the anchor and extends along a first longitudinal axis and an implant reducing member pivotally linked to the mounting member that extends along a second longitudinal axis that is offset from and variably positionable relative to the first longitudinal axis about a pivot axis. The reducing member contacts the implant element and includes a manipulation portion to move the implant element along the second longitudinal axis and can maintain contact to move the implant element toward the bone anchor when the reducing member is pivoted relative to the mounting member about the pivot axis.

Claims

1. A surgical instrument to position an implant element relative to a bone anchor of a spinal implant system, comprising:

an elongated extension with a distal end removably engageable to the bone anchor and extending along a first longitudinal axis from said distal end to a proximal end;

a mounting member removably mountable to said proximal end of said extension along said first longitudinal axis, said mounting member including first and second linking arms;

a reducing member extending along a second longitudinal axis, said reducing member being pivotally linked to said mounting member in side-by-side relation about a pivot axis, said reducing member including at least one leg movable distally along said second longitudinal axis for positioning in contact with the implant element, said first and second linking arms extending from a proximal end of said mounting member to said reducing member, wherein said first and second linking arms are coupled to opposite sides of said reducing member at said pivot axis; and

a lateral displacement member engaged to one of said mounting member and said reducing member and positionable in contact with a proximal portion of the other of said mounting member and said reducing member, said lateral displacement member being operable to move said proximal portion of said reducing member away from said mounting member about said pivot axis to move a distal end of said at least one leg toward said distal end of said extension thereby positioning the implant element in a location more proximate the bone anchor.

2. The instrument of claim 1, wherein said mounting member includes a proximal head portion and a cylindrical extension extending distally from said head portion, said head portion and said extension defining a passage therethrough along said first longitudinal axis.

3. The instrument of claim 2, wherein said head portion includes a bore extending therethrough transversely to said first longitudinal axis, and said lateral displacement member extends through said bore in threaded engagement with said mounting member therein.

4. The instrument of claim 3, wherein said lateral displacement member includes a first end positionable in contact with said reducing member and an opposite end including a handle, said lateral displacement member further including an elongated shaft extending between said first end and said handle.

5. The instrument of claim 1, wherein said reducing member includes:

an elongated housing portion including a body defining a cavity along said second longitudinal axis; and

a manipulation portion extending through said housing portion, said manipulation portion including a handle proximal of said housing and a pair of legs extending distally from said housing portion for contact with the implant element.

6. The instrument of claim 5, further comprising an elongated shaft between said handle and said pair of legs, wherein said pair of legs are joined at proximal ends thereof with a connector and a distal end of said shaft is rotatably engaged to said connector.

7. The instrument of claim 6, wherein said elongated shaft includes an external thread profile and is threadingly engaged to said housing portion, wherein rotation of said elongated shaft with said handle axially and rotationally displaces said shaft along said second longitudinal axis, which in turn axially and linearly displaces said pair of legs along said second longitudinal axis.

8. The instrument of claim 5, wherein said pair of legs each include a distal end with a concavely curved distal end surface for contacting the implant element when the implant element is positioned between the pair of legs.

9. The instrument of claim 5, wherein said housing portion includes a pair of rails extending distally therealong and said pair of legs are slidably received in grooves along facing sides of said pair of rails.

10. The instrument of claim 1, wherein said first and second linking arms are obliquely oriented to said first and second longitudinal axes when said first and second longitudinal axes are positioned in parallel relation to one another.

11. A method for positioning an implant element into a bone anchor, comprising:

providing an instrument as set forth in claim 1;

engaging the bone anchor to a vertebra of a spinal column;

positioning the implant element adjacent the bone anchor;

mounting the mounting member to the bone anchor with the mounting member extending proximally from the bone anchor along the first longitudinal axis;

contacting the implant element with the reducing member;

distally displacing the implant element relative to the bone anchor by moving at least one portion of the reducing member along the second longitudinal axis; and

laterally displacing the implant element toward the bone anchor by pivoting the reducing member about the pivot axis toward the bone anchor while maintaining contact of the reducing member with the implant element.

12. The method of claim 11, further comprising:

positioning the implant element in a passageway of the bone anchor; and

securing the implant element in the passageway with an implant driver positioned through the mounting member along the first longitudinal axis in engagement with the bone anchor.

13. The method of claim 11, wherein contacting the implant element includes positioning the implant element in concavely curved recesses formed in distal ends of a pair of distally extending legs of the reducing member.

14. The method of claim 11, wherein distally displacing the implant element includes distally moving a manipulation portion of the reducing member relative to a housing portion of the reducing member while maintaining an alignment of the first and second longitudinal axes relative to one another.

15. The method of claim 14, wherein the housing portion is pivotally linked to the mounting member and laterally displacing the implant element includes pivoting the housing portion and the manipulation portion together about the pivot axis.

16. The method of claim 15, wherein laterally displacing the implant element includes advancing a lateral displacement member secured to one of the mounting member and the reducing member against a proximal portion of the other of the mounting member and the reducing member proximally of the pivot axis to pivot the housing portion and the manipulation portion about the pivot axis.

17. The method of claim 11, wherein laterally displacing the implant element includes advancing a lateral displacement member secured to one of the mounting member and the reducing member against the other of the mounting member and the reducing member proximally of the pivot axis to pivot the reducing member about the pivot axis.

18. The method of claim 17, wherein the lateral displacement member includes a shaft threadingly engaged to the mounting member and rotation of the shaft advances the lateral displacement member against the reducing member.

19. The method of claim 18, wherein the shaft extends along an axis that is obliquely oriented to a plane including the first and second longitudinal axes.

20. The method of claim 11, wherein mounting the mounting member to the bone anchor includes mounting an extension to the bone anchor extending proximally from the bone anchor along the first longitudinal axis and mounting the mounting member to the extension.

21. The method of claim 11, wherein the mounting member includes a passage extending along the first longitudinal axis in communication with bone anchor.

22. The method of claim 11, wherein laterally displacing the implant element toward the bone anchor includes positioning the implant element into a passageway of the bone anchor, the passageway opening laterally in a direction facing the second longitudinal axis.

23. A surgical instrument to position implants relative to a bone anchor of a spinal implant system, comprising:

an elongated implant element;

a mounting member removably mountable to the bone anchor along a first longitudinal axis, said mounting member including at least one linking arm extending therefrom to a pivot end in an oblique orientation to said first longitudinal axis;

an elongated extension with a distal end removably engageable to the bone anchor and body extending along said first longitudinal axis to a proximal end removably engageable with said mounting member; and

a reducing member extending along a second longitudinal axis adjacent said mounting member, said reducing member including a housing portion and a manipulation portion mounted to and movable relative to said housing portion, said housing portion being pivotally coupled to said pivot end of said linking arm about a pivot axis, and said manipulation portion includes at least one distally extending leg contacting said implant element, wherein said at least one leg is movable distally relative to said housing portion along said second longitudinal axis for moving said implant element along said second longitudinal axis and said reducing member is pivotal relative to said mounting member about said pivot axis to change an orientation of said first and second longitudinal axes relative to one another and move said implant element transversely to said first longitudinal axis,

wherein said at least one linking arm extends from a proximal end of said mounting member to said reducing member.

24. The instrument of claim 23, further comprising a lateral displacement member engaged to said mounting member positionable in contact with said reducing member, said lateral displacement member being operable to move a proximal end of said reducing member away from said mounting member about said pivot axis.

25. The instrument of claim 24, wherein said mounting member includes a bore extending therethrough transversely to said first longitudinal axis, said lateral displacement member extending through said bore and engaging said mounting member therein.

26. The instrument of claim 25, wherein said lateral displacement member includes a first end positionable in contact with said reducing member and an opposite end including a handle, said lateral displacement member further including an elongated shaft extending between said first end and said handle, said shaft including a thread profile threadingly engaging said mounting member in said bore.

27. The instrument of claim 25, wherein said bore extends along a third axis that is obliquely oriented to a plane including said first and second longitudinal axes.

28. The instrument of claim 23, wherein said at least one linking arm includes a pair of linking arms pivotally coupled to opposite sides of said housing portion at said pivot axis.

29. The instrument of claim 23, wherein said at least one leg of said manipulation portion includes a pair of legs extending in side-by-side and spaced relation to one another, each of said pair of legs defining a concavely curved distal end and said implant element is positioned between said pair of legs in said concavely curved distal ends.

30. The instrument of claim 29, wherein said manipulation portion further comprises an elongated shaft between a proximal handle and said pair of legs, wherein said pair of legs are joined at proximal ends thereof with a connector and a distal end of said shaft is rotatably engaged to said connector.

31. The instrument of claim 30, wherein said elongated shaft includes an external thread profile and is threadingly engaged to said housing portion between said proximal handle and said distal end of said shaft, wherein rotation of said elongated shaft with said handle axially and rotationally displaces said shaft along said second longitudinal axis, which in turn axially and linearly displaces said pair of legs along said second longitudinal axis.

32. The instrument of claim 29, wherein said housing portion includes a pair of rails extending distally therealong and said pair of legs are slidably received in grooves along facing sides of said pair of rails.

33. A surgical instrument to position implants relative to a bone anchor of a spinal implant system, comprising:

an elongated implant element;

a mounting member removably mountable to the bone anchor along a first longitudinal axis, said mounting member including at least one linking arm extending therefrom to a pivot end in an oblique orientation to said first longitudinal axis; and

a reducing member extending along a second longitudinal axis adjacent said mounting member, said reducing member including a housing portion and a manipulation portion mounted to and movable relative to said housing portion, said housing portion being pivotally coupled to said pivot end of said linking arm about a pivot axis, and said manipulation portion includes at least one distally extending leg contacting said implant element, wherein said at least one leg is movable distally relative to said housing portion along said second longitudinal axis for moving said implant element along said second longitudinal axis and said reducing member is pivotal relative to said mounting member about said pivot axis to change an orientation of said first and second longitudinal axes relative to one another and move said implant element transversely to said first longitudinal axis,

wherein said at least one linking arm extends from a proximal end of said mounting member to said reducing member,

wherein said at least one linking arm includes a pair of linking arms pivotally coupled to opposite sides of said housing portion at said pivot axis.