Cutting/bending tool for polymer implant

Patent metadata

Field	Value
Publication number	US-9364329-B2
Application number	US-201313798322-A
Country	US
Kind code	B2
Filing date	Mar 13, 2013
Priority date	May 14, 2012
Publication date	Jun 14, 2016
Grant date	Jun 14, 2016

Abstract

A first tool is configured to cut a polymer implant, and includes a handle, a cutting portion, and a bending portion. A second tool is configured to cut a polymer implant, and includes a handle, a first cutting portion, and a second cutting portion. The cutting portions contain a cutter that is preferably a blade. In the second tool, the blades are preferably angled with respect to each other between about 45°. The tools can be used to reshape an implant that is to be used to replace a portion of a skull.

First claim

What is claimed:

1. A polymeric implant cutting tool that is configured to cut a polymeric implant, the tool comprising:
a tool body having a length along a first direction and including a handle portion comprising an upper handle portion and a lower handle portion spaced from the upper handle portion along a second direction, substantially perpendicular to the first direction, the upper handle portion having an outer surface and an opposing inner surface and the lower handle portion having an outer surface and an opposing inner surface;
a first cutting portion located at a distal portion of the tool body, the first cutting portion including a first cutting prong and a second cutting prong, the first cutting prong having an end and a first prong inner surface, and the second cutting prong having an end and a second prong inner surface that is spaced from the first prong inner surface along the second direction, the first cutting portion further including a first cutter having a first cutting edge to cut the implant, the first cutting edge being located longitudinally inward from the end of the first prong and the first cutter defining a substantially planar configuration that extends along a plane, wherein the plane is at an angle that is substantially perpendicular to the first direction and substantially parallel to the second direction; and
a second cutting portion located at a proximal portion of the tool body, the second cutting portion including a third cutting prong and a fourth cutting prong, the third cutting prong having an end and a third prong inner surface, and the fourth cutting prong having an end and a fourth prong inner surface that is spaced from the third prong inner surface along the second direction, the second cutting portion further including a second cutter having a second cutting edge to cut the implant, the second cutting edge being located longitudinally inward from the end of the third prong and being positioned at an angle of between 30° and 60° from the first cutting edge,
wherein the handle portion is between the first cutting portion and the second cutting portion.

2. The implant cutting tool according to claim 1 , wherein the first and second cutters are blades.

3. The implant cutting tool according to claim 2 wherein at the location of the cutting edge of the first blade the first prong inner surface and the second prong inner surface are a distance of from 6.25 mm to 8.25 mm in the second direction and the portion of the cutting edge of the first blade that is closest to the end of the first prong is located from about 3 mm to about 20 mm from the end of the first prong.

4. The implant cutting tool according to claim 3 wherein at the location of the cutting edge of the second blade the third prong inner surface and the fourth prong inner surface are a distance of from 6.25 mm to 8.25 mm in the second direction and the portion of the cutting edge of the second blade that is closest to the end of the third prong is located from about 3 mm to about 20 mm from the end of the third prong.

5. The implant cutting tool according to claim 4 wherein the second cutting edge is positioned at an angle of between 40° and 50° from the first cutting edge.

6. The implant cutting tool according to claim 5 wherein the distance along the second direction between the inner surface of the first prong and the inner surface of the second prong is less at a location where the first blade is located than at a location closer to the second blade.

7. The implant cutting tool according to claim 6 wherein the distance along the second direction between the inner surface of the first prong and the inner surface of the second prong is less at a location where the first blade is located than at a location farther from the second blade.

8. The implant cutting tool according to claim 7 wherein the distance along the second direction between the inner surface of the third prong and the inner surface of the fourth prong is less at a location where the second blade is located than at a location closer to the first blade.

9. The implant cutting tool according to claim 8 wherein the distance along the second direction between the inner surface of the third prong and the inner surface of the fourth prong is less at a location where the second blade is located than at a location farther from the first blade.

10. The implant cutting tool of claim 1 , wherein the first and second cutting prongs extend from a first end of the handle in the first direction and the third and fourth cutting prongs extend from a second end of the handle in a direction opposite the first direction.

11. The implant cutting tool of claim 1 , wherein the handle portion comprises at least one handle connection portion that interconnects the upper handle portion and the lower handle portion.

12. The implant cutting tool of claim 1 , wherein the handle portion defines at least first and second open spaces between the upper handle portion and the lower handle portion and between the first cutter and the second cutter, the first open space extends from the first cutter toward the second cutter, and the second open space extends from the second cutter toward the first cutter.

13. The implant cutting tool of claim 1 , wherein the second cutter defines a substantially planar configuration that extends along a plane, and the plane is at an angle with respect to the first direction.

14. The implant cutting tool of claim 13 , wherein the plane is at an angle of about 30-60° with respect to the first direction.

Assignees

• Depuy Synthes Products Inc

Inventors

• Recber Ali Cem
• Kerr Sean H
• Dwyer James
• Shane Christopher

Classifications

• B26B11/00

  Hand knives combined with other implements, e.g. with corkscrew, with scissors, with writing implement (combined table-ware A47G21/06) · CPC title

• B26B29/02

  Guards or sheaths for knives · CPC title

• A61B17/8863 Primary

  Apparatus for shaping or cutting osteosynthesis equipment by medical personnel · CPC title

• B26B17/00

  Hand cutting tools {, i.e. with the cutting action actuated by muscle power} with two jaws which come into abutting contact (nail clippers or cutters A45D29/02; joints therefor B25B7/06) · CPC title

• A61F2/2875 Primary

  Skull or cranium (A61F2/2803 takes precedence; joints for temporo-mandibular [TM] joints [TMJ] A61F2/3099) · CPC title