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ORTHOPEDIC METHOD AND SYSTEM FOR MAPPING AN ANATOMICAL PIVOT POINT

  • US 20110032184A1
  • Filed: 10/08/2010
  • Published: 02/10/2011
  • Est. Priority Date: 12/01/2005
  • Status: Active Grant
First Claim
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1. A method for determining a geometric center corresponding to an anatomical pivot point, the method comprising the steps of:

  • transmitting ultrasonic signals from an ultrasonic wand to an ultrasonic receiver;

    determining paired transmit-receive ranges between the ultrasonic wand and the ultrasonic receiver from time of flight and phase differential measurements;

    tracking the ultrasonic wand by way of, and relative to, the ultrasonic receiver during constrained rotational and translational movement determined to be within to a hemispherical banded boundary from the paired transmit-receive ranges;

    calculating a three-dimensional displacement and orientation time trajectory of the ultrasonic wand relative to the ultrasonic receiver from the tracking of the ultrasonic wand within the hemispherical banded boundary;

    generating a hemispherical surface representation of the constrained movement from the three-dimensional displacement and orientation time trajectory; and

    calculating a geometric center of the hemispherical surface representation relative to the ultrasonic receiver and applying a coordinate system transformation between the wand and receiver to map it to an anatomical pivot point.

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