Implant insertion tool

• US 20020058950A1
• Filed: 01/15/2002
• Published: 05/16/2002
• Est. Priority Date: 11/07/2000
• Status: Active Grant

• Current Assignee: Osteotech Incorporated (Medtronic Plc)
• Original Assignee: Ostetoech Incorporated
• Inventors: Martz, Erik, Winterbottom, John M.
• Granted Patent: US 6,746,454 B2
• Time in Patent Office: Days
• US Class Current: 606/99
• CPC Class Codes: A61F 2/28 Bones joints A61F2/30
• 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 2/4455 for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages intervertebral discs A61F2/442
• 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 2002/2839 Bone plugs or bone graft dowels
• CPC Class Codes: A61F 2002/30131 horseshoe- or crescent- or C-shaped or U-shaped
• CPC Class Codes: A61F 2002/30158 trapezoidal
• CPC Class Codes: A61F 2002/30324 differing in thickness
• CPC Class Codes: A61F 2002/30904 serrated profile, i.e. saw-toothed
• CPC Class Codes: A61F 2002/4622 having the shape of a forceps or a clamp
• 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 2002/4649 Bone graft or bone dowel harvest sites
• CPC Class Codes: A61F 2230/0013 Horseshoe-shaped, e.g. crescent-shaped, C-shaped, U-shaped
• CPC Class Codes: A61F 2230/0026 trapezoidal
• CPC Class Codes: A61F 2250/0036 differing in thickness
• CPC Class Codes: A61F 2310/00359 Bone or bony tissue

Abstract

A spinal implant tool comprises a steel shaft bifurcated into shaft portions at one end at which a pair of extensions extend from the bifurcated shaft portions. The extensions are flat members which extend from an implant impact element at the end of each of the shaft portions. A spinal bone implant is inserted between the extensions. A shaft portion displacement member has a stud threaded to one of the shaft portions and a knob head for capturing the other shaft portion to the member threaded stud. When the knob is rotated the shaft members are moved apart or closer together. A stop member limits the spread apart distance of the shaft portions.

Claims

1. An implant insertion tool comprising:

an elongated shaft having a longitudinal axis and proximal and distal ends, the shaft having a bifurcated distal end forming first and second shaft portions arranged to flex toward and away from each other in a direction generally normal to the axis;

a handle at the proximal shaft end;

an implant gripping extension extending from each the shaft portion in a distal direction for gripping an implant therebetween;

a displacement member attached to the shaft portions for displacing the first and second portions relative to each other in the generally normal directions toward and away from each other; and

a stop member secured to said portions for limiting the maximum distance said shaft portions and extensions can separate.

2. The tool of claim 1 wherein the displacement member comprises a threaded stud, a smooth surface circular cylindrical shank attached to the stud and a knob attached to the shank distal the stud, the shank for rotatable attachment to the first shaft portion and the stud for threaded engagement with the second shaft portion, the shank, knob and stud being dimensioned to capture the second portion between the stud and the knob.

3. The tool of claim 1 wherein the stop member comprises a shank and a head attached to the shank, the end of the shank distal the head being threaded to one of said shaft first and second portions and the head engaged with the other of said shaft first and second portions, the head being larger than the shank for capturing the other of said shaft first and second portions thereto.

4. The tool of claim 1 wherein the normal quiescent position of the extensions is arranged to receive the implant therebetween such that rotation of the knob closes the spacing between the extensions to grip the implant.

5. The tool of claim 2 wherein the stud has a diameter greater than that of the shank.

6. The tool of claim 1 wherein the displacement member comprises a threaded stud attached to the first shaft portion, a shank attached to and passing through the second shaft portion and a knob attached to the shank, the knob, shank and stud being arranged to capture the second member to the shank.

7. An implant insertion tool comprising:

an elongated shaft having a longitudinal axis and proximal and distal ends, the shaft having a bifurcated distal end forming first and second shaft portions arranged to flex toward and away from each other in a direction generally normal to the axis;

a handle at the proximal shaft end;

an implant gripping extension extending from each said shaft portion in a distal direction for gripping an implant therebetween;

a displacement member comprising a threaded stud attached to the first shaft portion, a shank attached to the second shaft portion and a knob arranged with the stud for capturing the second shaft portion between the stud and knob, the member for displacing the first and second portions apart and together in said generally normal directions toward and away from each other in response to rotation of the knob and stud; and

a stop member secured to said portions capturing one of said first and second portions thereto for limiting the maximum distance said shaft portions and extensions can separate.

8. An implant insertion tool comprising:

an elongated shaft having a longitudinal axis and proximal and distal ends, the shaft having a bifurcated distal end forming first and second shaft portions arranged to flex toward and away from each other in a direction generally normal to the axis;

a handle at the proximal shaft end;

an implant gripping extension extending from each the shaft portion in a distal direction for gripping an implant therebetween; and

a displacement member attached to the shaft portions for displacing the first and second shaft portions relative to each other in the generally normal direction toward and away from each other, the displacement member comprising movable displacement means having first and second positions for forcing the shaft portions apart in the first position for receiving and releasing the implant and for forcing the shaft portions together to an implant gripping state in the second position.

9. The tool of claim 8 wherein the displacement member includes a threaded stud for engagement with one of said shank portions and a second shank portion attached to the stud for movably engaging the other of said shank portions and including a knob for rotating the stud and shank portion to place the stud, shank and knob in the first and second positions.

10. The tool of claim 8 further including a stop member coupled to the shaft portions for limiting the distance the shaft portions can be separated in the first position.