Medical installation tool

• US 20020116009A1
• Filed: 12/07/2001
• Published: 08/22/2002
• Est. Priority Date: 05/08/2000
• Status: Active Grant

• Current Assignee: Depuy Synthes Products Incorporated (Johnson & Johnson)
• Original Assignee: Depuy Spine Incorporated (Johnson & Johnson)
• Inventors: Malone, Daniel, Grinberg, Alexander, Boomer, Mark, Moore, Bradley, Fraser, Robert D., OʼNeil, Michael J.
• Granted Patent: US 6,755,841 B2
• Time in Patent Office: Days
• US Class Current: 606/99
• CPC Class Codes: A61B 17/025 Joint distractors
• CPC Class Codes: A61B 2017/0256 for the spine
• CPC Class Codes: A61F 2/442 Intervertebral or spinal discs, e.g. resilient non-disc-shaped intervertebral inflatable pockets A61F2/441; non-disc-shaped intervertebral fusion implants A61F2/4455
• CPC Class Codes: A61F 2/446 having a circular or elliptical cross-section substantially parallel to the axis of the spine, e.g. cylinders or frustocones
• CPC Class Codes: A61F 2/4465 having a circular or kidney shaped cross-section substantially perpendicular to the axis of the spine
• CPC Class Codes: A61F 2/4603 for insertion or extraction of endoprosthetic joints or of accessories thereof
• CPC Class Codes: A61F 2/4611 of spinal prostheses
• CPC Class Codes: A61F 2002/30187 D-shaped or half-disc-shaped
• CPC Class Codes: A61F 2002/30235 tubular, e.g. sleeves
• CPC Class Codes: A61F 2002/30593 hollow
• CPC Class Codes: A61F 2002/30769 madreporic
• CPC Class Codes: A61F 2002/30787 inclined obliquely with respect to each other
• CPC Class Codes: A61F 2002/30845 with cutting edges
• CPC Class Codes: A61F 2002/30912 made of expanded metal, e.g. diamond mesh or metal nets having lozenge-shaped apertures
• CPC Class Codes: A61F 2002/443 having two transversal endplates and at least one intermediate component
• CPC Class Codes: A61F 2002/4622 having the shape of a forceps or a clamp
• CPC Class Codes: A61F 2002/4627 with linear motion along or rotating motion about the instrument axis or the implantation direction, e.g. telescopic, along a guiding rod, screwing inside the instrument
• CPC Class Codes: A61F 2002/4628 with linear motion along or rotating motion about an axis transverse to the instrument axis or to the implantation direction, e.g. clamping
• CPC Class Codes: A61F 2002/4629 connected to the endoprosthesis or implant via a threaded connection
• CPC Class Codes: A61F 2002/4681 by applying mechanical shocks, e.g. by hammering
• CPC Class Codes: A61F 2002/4687 : Mechanical guides for implantation instruments
• CPC Class Codes: A61F 2230/0034 : D-shaped
• CPC Class Codes: A61F 2230/0069 : cylindrical

Abstract

An installation tool that is useful for the efficient and effective placement of an article, such as an artificial disc, between adjacent vertebral bodies is provided. The installation tool can be provided as a kit having modular components which allow the surgeon to select from among a variety of components to assemble an installation tool that is optimized for its intended use. The installation tool of the invention generally includes a pair of opposed levers, each of which has a proximal handle portion and a distal portion. A fulcrum is disposed between the two levers to enable proper operation of the tool. The tool further includes a pusher block that is positioned between the two levers and is selectively movable between an initial location distal of the fulcrum and a final location adjacent the distal end of the levers. The pusher block includes a proximal end, a distal end, and a bore extending at least partially therethrough. A pusher rod, which facilitates movement of a pusher block, has a distal end extending into the bore in the pusher block and a proximal, handle end.

Claims

1. A medical device installation tool, comprising:

a pair of opposed levers, each having a proximal, handle portion and a distal portion;

a fulcrum disposed between the two levers and including an opening extending therethrough;

a pusher block having a proximal end, a distal end, and a bore extending at least partially therethrough, the pusher block being positioned between the two levers and slidably moveable between an initial location distal of the fulcrum and a final location adjacent a distal end of the levers; and

a pusher rod having proximal, handle end, and a distal end, the pusher rod being slidably disposed through the fulcrum and the distal end of the pusher rod extending into the bore in the pusher block.

2. The medical device installation tool of claim 1, wherein the bore is a blind bore and the distal end of the pusher rod mates with the blind bore in the pusher block.

3. The medical device installation tool of claim 1, wherein each lever includes a surface feature disposed between the proximal and distal ends thereof, the surface feature being effective to slidably mate to a complementary surface feature formed in a prosthesis.

4. The medical device installation tool of claim 1, wherein the bore extends entirely through the pusher block and the distal end of the pusher rod has a distal tip that is adapted to extend through the bore in the pusher block and that is effective to mate to a prosthesis.

5. The medical device installation tool of claim 4, wherein the pusher block has a height effective to separate the levers from a prosthesis such that, when the pusher rod is mated to a prosthesis, the levers are spaced apart from the prosthesis.

6. The medical device installation tool of claim 4, wherein the rod includes an externally threaded first distal portion and an externally threaded second distal portion, the second distal portion having a diameter greater than a diameter of the first distal portion and being positioned proximal to the first distal portion.

7. The medical device installation tool of claim 6, wherein:

the bore of the pusher block includes a threaded proximal opening that is threadingly matable with the second distal portion of the rod;

a distal opening of the pusher block having a diameter less than the diameter of the second distal portion of the rod; and

a chamber disposed between the first and second openings, the chamber having a diameter greater than the diameter of the second distal portion of the rod.

8. The medical device installation tool of claim 7, wherein the rod is freely rotatable when the second distal portion is disposed within the chamber of the pusher block.

9. The medical device installation tool of claim 7, wherein the threaded first distal portion of the rod is threaded in a direction opposite to the direction of the threads of the threaded second distal portion.

10. The medical device installation tool of claim 1, wherein the bore extends entirely through the pusher block and a distal tip of the pusher rod is adapted to extend through the bore in the pusher block, the distal tip of the pusher rod being further adapted to mate to a grasping element effective to releasably engage a prosthesis.

11. The medical installation tool of claim 1, wherein the bore extends entirely through the pusher block and a distal tip of the pusher rod is adapted to extend through the bore in the pusher block, the distal tip of the pusher rod being further adapted to positively engage a prosthesis.

12. The medical device installation tool of claim 10, wherein the grasping element has an elongate proximal portion with a bore formed therein and a distal portion that is effective to releasably engage a prosthesis, the proximal portion having an outer diameter that is adapted to fit within the bore of the distal end of the pusher block.

13. The medical device installation tool of claim 12, wherein the distal portion of the grasper includes opposed first and second components that are movable between a first, open position, and a second, closed position that is effective to engage a prosthesis.

14. The medical device installation tool of claim 13, wherein the distal end of the rod threadingly engages the bore of the grasping element, and wherein rotation of the rod in a first direction is effective to cause the elongate proximal portion of the grasping element to move proximally within the bore of the pusher block and move the first and second components to the second, closed position while rotation of the rod in a second direction is effective to cause the elongate proximal portion of the grasping element to move distally out of the bore of the pusher block and move the first and second components to the first, open position.

15. The medical device installation tool of claim 14, wherein the first and second components each include at least one surface feature effective to engage a prosthesis.

16. The medical device installation tool of claim 1, wherein the pusher block has upper and lower recesses, each adapted to seat one of the levers, each of the upper and lower recesses including opposed, substantially vertical walls separated by a substantially horizontal base wall, the vertical walls each including a rail extending between the proximal and distal ends of the pusher block and effective to retain the levers.

17. The medical device installation tool of claim 1, wherein the handle portion of each lever is substantially T-shaped.

18. The medical device installation tool of claim 1, wherein the pusher rod includes a stop member effective to limit advancement of the pusher rod through the opening in the fulcrum.

19. The medical device installation tool of claim 1, wherein the distal portion of each lever includes a curved tip.

20. A medical device installation kit, comprising:

a pair of opposed levers, each lever having a proximal handle portion and a distal portion;

a fulcrum disposed between the opposed levers for allowing pivotal movement of the levers with respect to each other;

a plurality of prosthesis installation assemblies adapted to be slidably disposed between the levers and movable between a first, proximal position and a second, distal position, each assembly including a handle portion effective to move the prosthesis installation assembly between the first and second positions, and a distal prosthesis effecting element adapted to place a prosthesis between adjacent bone structures.

21. The medical device installation kit of claim 20, wherein one of the prosthesis installation assemblies comprises:

a pusher block having a proximal end, a distal end, and a bore extending therethrough;

pusher rod slidably disposed between the levers and extending through the bore in the pusher block; and

a grasping element effective to releasably engage a prosthesis.

22. The medical device installation kit of claim 21, wherein the grasping element has an elongate proximal portion adapted to fit within the bore of the distal end of the pusher block, and a distal portion having opposed first and second components which are movable between a first, open position, and a second, closed position that is effective to engage a prosthesis.

23. The medical device installation kit of claim 22, wherein a distal end of the rod threadingly engages the bore of the grasping element, and wherein rotation of the rod in a first direction is effective to cause the elongate proximal portion of the grasping element to move proximally within the bore of the pusher block and move the first and second components to the second, closed position while rotation of the rod in a second direction is effective to cause the elongate proximal portion of the grasping element to move distally out of the bore of the pusher block and move the first and second components to the first, open position.

24. The medical device installation kit of claim 20, wherein one of the prosthesis installation assemblies comprises a pusher rod having a proximal handle portion, and distal portion having a distal tip adapted to positively engage a prosthesis.

25. The medical device installation kit of claim 24, wherein the prosthesis installation assembly further includes a pusher block having a proximal end, a distal end, and a bore extending therethrough, the distal portion of the pusher rod extending through the bore in the pusher block.

26. The medical device installation kit of claim 20, wherein one of the prosthesis installation assemblies comprises:

a pusher rod having an externally threaded first distal portion and an externally threaded second distal portion, the second distal portion having a diameter greater than a diameter of the first distal portion and being positioned proximal to the first distal portion;

a pusher block having a bore extending entirely therethrough having a threaded proximal opening that is threadingly matable with the second distal portion of the rod, and a distal opening having a diameter less than the diameter of the second distal portion of the rod; and

a chamber disposed between the first and second openings and having a diameter greater than the diameter of the second distal portion of the rod.

27. The medical device installation kit of claim 26, wherein the rod is freely rotatable when the second distal portion is disposed within the chamber of the pusher block.

28. The medical device installation kit of claim 27, wherein the first distal portion of the rod is adapted to positively engage a prosthesis.

29. The medical device installation kit of claim 21, wherein one of the prosthesis installation assemblies comprises:

a pusher block having a proximal end, a distal end, and a bore extending therethrough, the pusher block being slidably disposed between the levers;

a pusher rod having a proximal, handle portion and a distal portion extending through the bore in the pusher block; and

a plurality of connector elements having a proximal portion adapted to mate to a distal tip of the pusher rod and a distal portion adapted to mate to a prosthesis.