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Non-imaging, computer assisted navigation system for hip replacement surgery

  • US 6,711,431 B2
  • Filed: 02/13/2002
  • Issued: 03/23/2004
  • Est. Priority Date: 02/13/2002
  • Status: Expired due to Term
First Claim
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1. A method of verifying reliability of a computer assisted, optically tracked surgical navigation system, comprising the steps of:

  • fixing an optically trackable marker to a bone at a point of attachment;

    placing a mark on said bone at a location removed from said point of attachment;

    inputting an initial position of said mark into an optical tracking system by touching said mark with an optically trackable probe, while simultaneously tracking said optically trackable marker;

    calculating an initial vector locating said mark in the reference frame of said optically trackable marker;

    at a later time, inputting a later position of said mark into the optical tracking system by touching said mark again with the optically trackable probe, while simultaneously tracking said optically trackable marker;

    calculating a second vector locating the later position of said mark in the later reference frame of the optically trackable marker; and

    comparing said initial and said later vectors to verify that said optically trackable marker has remained fixed relative to said mark.

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