Tools for use in seating spinal rods in open ended implants

• US 5,720,751 A
• Filed: 11/27/1996
• Issued: 02/24/1998
• Est. Priority Date: 11/27/1996
• Status: Expired due to Term

• Current Assignee: SDGI Holdings Incorporated (Medtronic Plc)
• Original Assignee: Roger P. Jackson
• Inventors: Jackson, Roger P.
• Primary Examiner(s): Buiz, Michael
• Assistant Examiner(s): REIP, DAVID OWEN
• Application Number:
  US08/757,483
• Time in Patent Office: 454 Days
• Field of Search: 606/61, 606/104, 606/60, 606/99, 606/86
• US Class Current: 606/86.00R
• CPC Class Codes: A61B 17/7032 Screws or hooks with U-shaped head or back through which longitudinal rods pass
• CPC Class Codes: A61B 17/7086 Rod reducers, i.e. devices providing a mechanical advantage to allow a user to force a rod into or onto an anchor head other than by means of a rod-to-bone anchor locking element; rod removers
• CPC Class Codes: A61B 17/7091 for applying, tightening or removing longitudinal element-to-bone anchor locking elements, e.g. caps, set screws, nuts or wedges
• CPC Class Codes: Y10S 606/914 Toolkit for installing or removing spinal positioner or stabilizer

Abstract

A set of tools for use in seating a spinal rod in a rod receiving channel in a head of an open ended spinal surgery implant such as a bone screw, hook or transverse connector wherein each of the tools comprises an implant holder for grasping, holding or engaging an implant, and a pusher assembly including a pusher bar advanceable relative to the implant holder to drive, push or force a spinal rod into the rod receiving channel of an implant held by the implant holder. The implant holders are of various configurations to facilitate holding or grasping of different types of implants or to accommodate different situations relating to the location of the implant. The pusher assembly is adapted for interchangeable use with each of the various implant holders. The pusher assembly is threadingly secureable to each of the implant holders and includes a pusher bar having an elongate slot extending therethrough. The slot in the pusher bar and a channel or slot in the implant holder provides access to the head of the open ended implant in which the spinal rod is seated to permit the installation of a cap thereon.

Claims

1. An apparatus for seating a spinal rod in a rod receiving channel in a head of an open ended spinal surgery implant;

said apparatus comprising;

a. an implant holder having a handle portion and an implant engaging portion;

said implant engaging portion including opposed implant engaging members for securing one of the implants therebetween;

b. a receptacle secured to said handle portion and having a threaded bore extending therethrough;

c. a pusher assembly having a threaded stem rotatably connected to a rod engaging member;

said threaded stem being threadingly securable within said threaded bore in said receptacle such that said rod engaging member is advanceable toward and away from an implant secured between said opposed implant engaging members through rotation of said threaded stem;

d. said implant holder further includes a web having a lower edge which extends transverse to the axis of the rod receiving channel of said implant when said implant is secured between said implant engaging members; and

e. an opening extends between said lower edge of said web and said head of said implant secured between said implant engaging members.

2. The apparatus as in claim 1 wherein:

a. said pusher assembly is removably securable to said implant holder.

3. The apparatus as in claim 1 wherein:

a. said receptacle includes an access slot extending therethrough in communication with said threaded bore; and

b. a portion of said threaded stem of said pusher assembly is sized for insertion through said access slot.

4. The apparatus as in claim 1 wherein:

a. said implant holder further includes a pair of guides defining a pair of opposed guide channels through which at least portions of said rod engaging member may be extended for guiding said rod engaging member relative to said implant holder during advancement of said rod engaging member relative to said implant holder.

5. The apparatus as in claim 1 wherein:

a. a lower surface of said rod engaging member includes a semi-circular rod receiving indent therein adapted to conform to a portion of an outer surface of a spinal rod.

6. The apparatus as in claim 1 wherein:

a. said implant holder comprises a first arm and a second arm pivotally secured together such that said handle portion comprises an upper portion of said first and second arms and said implant engaging portion comprises a lower portion of said first and second arms.

7. An apparatus for seating a spinal rod in a rod receiving channel in a head of an open ended spinal surgery implant and which permits installation of an implant cap on said head of said open ended spinal surgery implant while maintaining the spinal rod in a seated alignment;

said apparatus comprising;

a. an implant holder having a handle portion and an implant engaging portion;

said implant engaging portion including opposed implant engaging members for securing said implant therebetween;

b. a pusher assembly including a rod engaging member securable relative to said implant holder such that said rod engaging member is advanceable axially relative to said implant holder toward and away from the implant engaged thereby;

said rod engaging member including at least one leg and an abutment member extending perpendicular to said leg at a lower end thereof for engaging a spinal rod and such that an opening extends from above said abutment member toward an upper end of said leg for providing access to an implant secured between said implant engaging members to facilitate installation of a cap thereon;

c. said implant holder further includes a web having a lower edge which extends transverse to the axis of the rod receiving channel of said implant when said implant is secured between said implant engaging members; and

d. an opening extends between said lower edge of said web and said head of said implant secured between said implant engaging members.

8. The apparatus as in claim 7 wherein:

a. said implant holder comprises a first arm and a second arm pivotally secured together such that said handle portion comprises an upper portion of said first and second arms and said implant engaging portion comprises a lower portion of said first and second arms.

9. The apparatus as in claim 7 wherein:

a. a receptacle having a threaded bore extending therethrough is mounted on said handle portion of said implant holder; and

b. said pusher assembly further comprises a threaded stem rotatably connected to said rod engaging member at an upper end thereof;

said threaded stem being threadingly securable within said threaded bore in said receptacle.

10. The apparatus as in claim 9 wherein:

a. said receptacle includes an access slot extending therethrough in communication with said threaded bore; and

b. a portion of said threaded stem of said pusher assembly is sized for insertion through said access slot.

11. The apparatus as in claim 7 wherein:

a. said leg of said rod engaging member comprises one of two opposed legs spaced apart by said abutment member at a lower end thereof and defining a slot extending therebetween;

said slot sized for insertion of a cap therethrough for installation on an implant secured between said implant engaging members.

12. The apparatus as in claim 11 wherein:

a. said implant holder further includes a pair of guides defining guide channels through which at least portions of said opposed legs of said rod engaging member may be extended.

13. An apparatus for seating a spinal rod in a rod receiving channel in a head of an open ended spinal surgery implant and which permits installation of an implant cap on said head of said open ended spinal surgery implant while maintaining the spinal rod in a seated alignment;

said apparatus comprising;

a. an implant holder having a handle portion and an implant engaging portion;

said implant engaging portion including opposed engaging members for securing one of the implants therebetween;

b. a receptacle secured to said handle portion and having a threaded bore extending therethrough;

c. a pusher assembly having a threaded stem rotatably connected to a rod engaging member;

said threaded stem being threadingly securable within said threaded bore in said receptacle such that said rod engaging member is advanceable toward and away from an implant secured between said implant engaging members through rotation of said threaded stem;

said rod engaging member including a pair of opposed legs defining a slot extending therebetween and a cross member extending between said opposed legs at a lower end thereof;

said slot being sized for insertion of an implant cap therethrough;

d. a pair of guides secured to said implant holder and defining a pair of rod engaging member receiving channels through which at least portions of said opposed legs of said rod engaging member may be extended; and

e. a web having a lower edge extending transverse to the axis of the rod receiving channel of an implant secured between said implant engaging members;

an opening extends between said lower edge of said web and said head of said implant secured between said implant engaging members.

14. The apparatus as in claim 13 wherein:

a. said receptacle includes an access slot extending therethrough in communication with said threaded bore; and

b. a portion of said threaded stem of said pusher assembly is sized for insertion through said access slot.

15. The apparatus as in claim 13 wherein:

a. said implant holder comprises a first arm and a second arm pivotally secured together such that said handle portion comprises an upper portion of said first and second arms and said implant engaging portion comprises a lower portion of said first and second arms.

16. An apparatus for seating a spinal rod in a rod receiving channel in a head of an open ended spinal surgery implant and which permits installation of an implant cap on said head of said open ended spinal surgery implant while maintaining the spinal rod in a seated alignment;

said apparatus comprising;

a. an implant holder comprising a first arm and a second arm pivotally secured together, an upper portion of each of said first and second arms comprising a handle portion and a lower portion of each of said first and second arms comprising an implant engaging member;

said implant engaging members pivotally advanceable between an open alignment and a closed alignment for securing one of the implants therebetween;

b. a receptacle secured to said handle portion of one of said first and second arms and having a threaded bore extending therethrough;

c. a pusher assembly having a threaded stem rotatably connected to a rod engaging member;

said threaded stem being threadingly securable within said threaded bore in said receptacle such that said rod engaging member is advanceable toward and away from an implant secured between said implant engaging members through rotation of said threaded stem;

said rod engaging member including a pair of opposed legs defining a slot extending therebetween and an abutment member extending between said opposed legs at a lower end thereof;

said slot being sized for insertion of an implant cap therethrough;

d. a pair of guides secured to said implant holder and defining a pair of guide channels through which at least portions of said opposed legs of said rod engaging member may be extended; and

e. a web having a lower edge extending transverse to the axis of the rod receiving channel of an implant secured between said implant engaging members;

an opening extends between said lower edge of said web and said head of said implant secured between said implant engaging members.

17. The apparatus as in claim 16 wherein:

a. said receptacle includes an access slot extending therethrough in communication with said threaded bore; and

b. a portion of said threaded stem of said pusher assembly is sized for insertion through said access slot.

18. An apparatus for seating a spinal rod in a rod receiving channel in a head of an open ended spinal surgery implant;

said apparatus comprising;

a. an implant holder having a handle portion and an implant engaging portion;

said implant engaging portion including opposed implant engaging members for securing one of the implants therebetween; and

b. a pusher assembly having a rod engaging member and securable to said implant holder such that said rod engaging member is selectively advanceable toward and away from an implant secured between said opposed implant engaging members for seating a spinal rod in the rod receiving channel in the head of the implant secured between said implant engaging members;

said rod engaging member including a pair of opposed legs defining a slot extending therebetween and a cross member extending between said opposed legs at a lower end thereof;

said slot sized and positioned to permit access to an open end of an implant secured between said opposed implant engaging members.

19. The apparatus as in claim 18 wherein:

a. said implant holder further includes a pair of guides defining guide channels through which at least portions of said opposed legs of said rod engaging member may be extended.

20. An apparatus for seating a spinal rod in a rod receiving channel in a head of an open ended spinal surgery implant;

said apparatus comprising;

a. an implant holder having a handle portion and an implant engaging portion;

said implant engaging portion including opposed implant engaging members for securing one of the implants therebetween;

b. a pusher assembly having a rod engaging member and securable to said implant holder such that said rod engaging member is selectively advanceable toward and away from an implant secured between said opposed implant engaging members;

c. said implant holder further includes a web having a lower edge which extends transverse to the axis of the rod receiving channel of said implant when said implant is secured between said implant engaging members; and

d. an opening extends between said lower edge of said web and said head of said implant secured between said implant engaging members.