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MEMS-BASED METHOD AND SYSTEM FOR TRACKING A FEMORAL FRAME OF REFERENCE

  • US 20110218458A1
  • Filed: 07/26/2010
  • Published: 09/08/2011
  • Est. Priority Date: 03/02/2010
  • Status: Active Grant
First Claim
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1. A system for tracking a femoral frame of reference in computer-assisted surgery, comprising:

  • a sensor unit adapted to be secured to the femur, the sensor unit comprising an accelerometer sensor and a gyroscope sensor both producing orientation data;

    a processing unit receiving gyroscope data and accelerometer data and comprising;

    a gyroscope-data calculator for providing calculated acceleration data from at least the gyroscope data resulting from movements of the femur;

    an accelerometer-data calculator for calculating measured acceleration data from the accelerometer data resulting from movements of the femur; and

    an acceleration comparator for relating an orientation of the sensor unit to the femur to define a femoral frame of reference, from the comparison between the calculated acceleration data and the measured acceleration data;

    a sensor orientation interface for providing orientation data for the femur from a tracking of the femoral frame of reference.

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