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Browse Prior Art Database

Femoral Bow Yoke

IP.com Disclosure Number: IPCOM000109275D
Publication Date: 2005-Mar-23
Document File: 1 page(s) / 131K

Publishing Venue

The IP.com Prior Art Database

Abstract

A step during computer-assisted knee surgery registers the bow of the femur, this is normally done by placing a plane finder on the anterior face of the femur. Using a minimally invasive approach significantly reduces the access to the anterior surface of the femur, and so makes the use of a plane finder here impractical. Therefore, a new system of assessing the bow of the femur is required.

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Relevant prior art & Discussion of technical problem

A step during computer-assisted knee surgery registers the bow of the femur, this is normally done by placing a plane finder on the anterior face of the femur. Using a minimally invasive approach significantly reduces the access to the anterior surface of the femur, and so makes the use of a plane finder here impractical.  Therefore, a new system of assessing the bow of the femur is required.

Discussion of solution

The plane finder does not necessarily need to be placed actually on the femur itself, as long as the plane generated is parallel to that of the femoral bow.  The design shown below replicates the bow of the femur, outside of the wound, by referencing the anterior face and offering a capture to insert in the plane finder, which is parallel to the bow:

       
   

Replicates plane of femoral bow

 
 
 

Seats on anterior femur

 
 

The geometry that enters the wound is anatomically sympathetic, and is contoured so as not to cause injury. 

Variations on features used in the solution

The instrument doesn’t necessarily need to be in the exact shape above, the capture for the plane finder could be in a number of positions – increased offset, M/L offset, double back over the femur, as long as the planes are parallel.

Due to the inherent limited access in MI procedures this yoke could be used to verify any resection plane, and isn’t necessarily restricted to just the femoral bow.

 


Document headers and footers

1 23/03/05