Osteotome extractor

Patent metadata

Field	Value
Publication number	US-9289218-B2
Application number	US-201213553610-A
Country	US
Kind code	B2
Filing date	Jul 19, 2012
Priority date	Jul 19, 2011
Publication date	Mar 22, 2016
Grant date	Mar 22, 2016

Abstract

A surgical tool, enabling extraction of a prosthesis from a bony implantation site of that prosthesis, defines a proximo-distal axis and includes a distal end head adapted both to cut at least partially the bonding interface between the prosthesis and the bony material of the implantation site and to fix itself to the prosthesis by rotation centered on the proximo-distal axis, according to embodiments of the present invention.

First claim

What is claimed is:

1. A system comprising:
an implant comprising a plurality of apertures; and
a tool for implant extraction, the tool comprising:
a longitudinal axis and a distal head,
wherein the distal head comprises a main body and a plurality of elongate cutting elements projecting from an external periphery of a distal face of the main body, the plurality of elongate cutting elements configured to at least partially cut an interface between the implant and bony material at an implantation site of the implant, each of the plurality of elongate cutting elements configured to extend through a corresponding one of said plurality of apertures of the implant and to couple with the corresponding one of said apertures upon rotation of the tool about the longitudinal axis; and
wherein each of the plurality of cutting elements comprises a proximal portion and a distal end, the proximal portion having a reduced thickness in a circumferential direction compared to the distal end, the reduced thickness of the proximal portion being configured to facilitate coupling of the tool and the implant upon rotation of the tool about the longitudinal axis.

2. The system of claim 1 , wherein the distal head is configured as a bayonet connection adapted to couple the distal head with the implant upon rotation of the distal head about the longitudinal axis.

3. The system of claim 1 , wherein the plurality of cutting elements extend from the distal head substantially parallel to the longitudinal axis, wherein each of the plurality of cutting elements comprises:
a distal edge configured to cut into bone; and
a leading edge that is also configured to cut into bone, the leading edge including a notch configured to engage a slot edge of the implant.

4. The system of claim 3 , wherein each of the plurality of cutting elements includes a proximal end adjacent to the distal head, and wherein the notch is located on the leading edge closer to the proximal end than to the distal edge.

5. The system of claim 4 , wherein the notch is located on the leading edge at the proximal end.

6. The system of claim 3 , wherein each of the plurality of cutting elements extends from the leading edge to a trailing edge along a portion of a virtual tubular wall centered on the longitudinal axis.

7. The system of claim 1 , wherein the plurality of cutting elements are spaced apart by substantially the same circumferential separation.

8. The system of claim 7 , wherein the plurality of cutting elements comprises at least three cutting elements.

9. The system of claim 1 , wherein the tool further comprises a shaft extending along the longitudinal axis, wherein the distal end of the shaft is affixed to the distal head, and wherein a driving handle is affixed to a proximal end of the shaft.

10. The system of claim 9 , wherein the shaft comprises a shoulder located between the driving handle and the distal head, and wherein the shoulder is configured to accept placement of a traction force on the shaft.

11. The system of claim 1 , wherein the implant comprises a flange configured to bear on the implantation site, and wherein the flange is configured to couple with the tool upon rotation of the distal head about the longitudinal axis.

12. The system of claim 1 , wherein the implant comprises a flange, the flange comprising a proximal surface and a distal surface, wherein the distal surface is configured to bear on the implantation site, wherein the flange comprises the plurality of apertures.

13. The system of claim 1 , wherein each of the plurality of cutting elements comprises:
a leading edge extending in a longitudinal direction; and
a trailing edge opposite the leading edge and extending in the longitudinal direction.

14. The system of claim 1 , wherein, in use, the distal end of each of the cutting elements is disposed at a distal-most edge of the cutting tool.

15. A system comprising:
an implant comprising a plurality of apertures; and
a tool for implant extraction, the tool comprising:
a longitudinal axis and a distal head,
wherein the distal head comprises a main body and a plurality of elongate cutting elements projecting longitudinally from a distal face of the main body, the plurality of elongate cutting elements being circumferentially spaced apart about a periphery of the distal face of the main body, the plurality of elongate cutting elements being configured to at least partially cut an interface between the implant and bony material at an implantation site of the implant;
wherein each of the plurality of cutting elements comprises:
a leading edge extending in a longitudinal direction, the leading edge comprising a proximal portion and a distal portion, the distal portion comprising a cutting edge configured to cut into bone, the proximal portion comprising a notch; and
a trailing edge opposite the leading edge and extending in a longitudinal direction;
wherein the notch comprises a circumferential step projecting from the leading edge toward the trailing edge of at least one of the elongate cutting elements, and

wherein, in use, the notch is configured to facilitate coupling of the tool and the implant upon rotation of the tool about the longitudinal axis.

16. The system of claim 15 , wherein the cutting edge of each of the plurality of cutting elements extends from the notch to a distal edge of said cutting element.

17. The system of claim 15 , wherein the cutting edge of each of the plurality of cutting elements is entirely radially inward of an outer periphery of the main body.

18. The system of claim 15 , wherein there are no cutting edges disposed radially inwardly of the plurality of cutting elements disposed at the periphery of the distal face.

Assignees

• Courtney Jr Robert
• Ondrla Jeffrey M
• Tornier Inc

Inventors

• Courtney Jr Robert
• Ondrla Jeffrey M

Classifications

• A61F2002/4619

  for extraction · CPC title

• A61F2002/30426

  Bayonet coupling · CPC title

• A61F2/4607

  of hip femoral endoprostheses · CPC title

• A61F2/4603 Primary

  for insertion or extraction of endoprosthetic joints or of accessories thereof · CPC title

• A61B17/16 Primary

  Instruments for performing osteoclasis; Drills or chisels for bones; Trepans {(arthroscopic bone cutters A61B17/320016)} · CPC title