Patient-Adapted Osteotomy Template for Precise Resection of the Neck of the Femur in a Total Hip Prosthesis Operation

• US 20080234685A1
• Filed: 05/13/2005
• Published: 09/25/2008
• Est. Priority Date: 05/18/2004
• Status: Abandoned Application

• Current Assignee: Scandinavian Customized Prosthesis ASA
• Original Assignee: Scandinavian Customized Prosthesis ASA
• Inventors: Gjerde, Jan Magne
• Application Number:
  US11/568,982
• Publication Number:
  US 20080234685A1
• Time in Patent Office: Days
• US Class Current: 606/89
• CPC Class Codes: A61B 17/00234 for minimally invasive surgery A61B17/0218, A61B17/0469, A61B17/12013, A61B17/1285, A61B17/29, A61B17/320016 take precedence
• CPC Class Codes: A61B 17/15 Guides therefor arrangements for guiding straight saw blades in general B23D51/025
• CPC Class Codes: A61B 2017/0023 disposable

Abstract

A patient-adapted osteotomy template for precise resection of the femur in a total hip prosthesis operation with the use of a reamer comprises an upper abutment surface for abutment with the femur, a connecting surface fixed to the upper abutment surface and a guide surface, a guide slot provided in the connecting surface and an orientation indicator fixed to or provided in the osteotomy template. The guide surface and slot define the desired cutting plane and provide guidance of the resection instrument for the resection operation when the upper abutment surface is in abutment against the femur and when the osteotomy template is rotated about the drilling axis of the reamer so that the orientation indicator is in a specific position.

Claims

1. A patient-adapted osteotomy template for guiding a resection instrument along a desired cutting plane for a femur in a total hip prosthesis operation with the use of a reamer, where the osteotomy template is adapted to be inserted in the reamer, characterised in that it comprises:

an upper abutment surface for abutment with the femur,

a connecting surface fixed to;

the upper abutment surface and

a guide surface,

a guide slot arranged in the connecting surface and

an orientation indicator fixed to or mounted in the osteotomy template, where the guide surface and slot define the desired cutting plane and provide guidance of the resection instrument for the resection when the upper abutment surface is in abutment against the femur and when the osteotomy template is rotated about the drilling axis of the reamer so that the orientation indicator has a specific position, where the osteotomy template is composed of a single piece.

2. A patient-adapted osteotomy template according to claim 1, characterised in that the orientation indicator is an abutment portion adapted for abutment against the femur, the appointed position being achieved when the abutment portion is in abutment against the femur.

3. A patient-adapted osteotomy template according to claim 1, characterised in that the orientation indicator is a marking on the upper abutment surface, the appointed position being achieved when the marking is parallel to the patient'"'"'s knee kondyle plane or to the horizontal plane.

4. A patient-adapted osteotomy template according to claim 1, characterised in that the orientation indicator is composed of a marking or an edge on the osteotomy template, the appointed position being achieved when the marking or the edge forms a given angle with the knee kondyle plane or the horizontal plane.

5. A patient-adapted osteotomy template according to claim 1, characterised in that the abutment surface is adapted for abutment against the trochanter major in a plane substantially perpendicular to the drilling axis of the reamer.

6. A patient-adapted osteotomy template according to claim 1, characterised in that the abutment surface is adapted for abutment against the caput.

7. A patient-adapted osteotomy template according to claim 2, characterised in that the abutment surface is composed of one of the guide surface'"'"'s edges, and that the guide slot is arranged at the transition between the connecting surface and the guide surface.

8. A patient-adapted osteotomy template according to claim 2, characterised in that the abutment surface is adapted for abutment against the calcar.

9. A patient-adapted osteotomy template according to claim 1, characterised in that it comprises an additional surface that is substantially parallel to the upper abutment surface, where the two parallel surfaces have holes disposed along a line parallel to the drilling axis of a reamer.

10. A patient-adapted osteotomy template according to claim 1, characterised in that the osteotomy template is made of a single piece of material.

11. A patient-adapted osteotomy template according to claim 1, characterised in that the osteotomy template is made of a plate that is cut and folded in order to provide the desired shape.

12. A patient-adapted osteotomy template according to claim 1, characterised in that the distance between the upper abutment surface and the abutment portion is determined on the basis of the distance between the trochanter major and the calcar in the individual patient.

13. A method for manufacturing a patient-adapted osteotomy template for guiding a resection instrument along a desired cutting plane for a femur in a total hip prosthesis operation with the use of a reamer, where the osteotomy template is adapted to be inserted in the reamer, characterised in that the method comprises the following steps:

providing images of the femur that has to be resected,

on the basis of the images of the femur;

to determine the position of the optimal cutting plane,

to determine the position of an upper abutment surface adapted for abutment with the upper part of the femur,

to provide the upper abutment surface and a connecting surface connected with the abutment surface and a guide surface with a guide slot, where, based on the images of the femur, the extent of the connecting surface is selected so that the plane defined by the guide surface and the guide slot coincide with the optimal cutting plane,

to provide an orientation indicator for indicating correct rotation of the osteotomy template about the drilling axis of the reamer.

14. A method according to claim 13,

characterised in that the orientation indicator is an abutment portion adapted for abutment against the femur, and that correct rotation is achieved by rotating the osteotomy template so that the abutment portion comes into abutment against the femur.

15. A method according to claim 13,

characterised in that the distance between the upper abutment surface and the abutment portion is determined on the basis of the distance between the trochanter major and the calcar in the individual patient.