Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Bone resection method amd tools avoiding undercuts

IP.com Disclosure Number: IPCOM000177385D
Publication Date: 2008-Dec-11
Document File: 3 page(s) / 581K

Publishing Venue

The IP.com Prior Art Database

Abstract

This disclosure covers a method for removing a section of bone during an orthopaedic procedure. It is primarily focused on the preparation of the femoral box cut for a PS Knee implant.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 55% of the total text.

Page 1 of 3

Introduction

This disclosure covers a method for removing a section of bone during an orthopaedic procedure. It is primarily

focused on the preparation of the femoral box cut for a PS Knee.

Prior Art

Box cuts are prepared using a variety of methods and power tools.l • uses a notch guide and onhopaedic saws, either oscillating saws or reciprocating saws. OUf competitors --" .use reamers to

prep the box.

f

~._-

\

The problem with our current box prep is that when an oscillating saw is used to cut the base of the box it can produce undercuts (due to the fan shape the blade moves through and the lack of constraint from the instrumentation). Surgeons have a perception that this weakens the bone and can increase the risk of condylar

fracture. Figure 1 sketches out this issue, the black lines show typical 'overcuts'.

Solution

The solution is to develop a method that does not produce undercuts. A reaming option works in this respect but there is IP existing in this area.

My solution is based on using a circular cutter as shown in the process depicted in figure 2.

f

Tech Problem

[This page contains 1 picture or other non-text object]

Page 2 of 3

Step 1: Ajig is used to guide the saw along 3 straight cuts. The two outer marks define the box width, and a further line is marks the centre ofthe box width. A mechanical jig would be needed to guide the saw at this stage, for the purposes of this...