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METHOD AND SYSTEM FOR ASSESSING ORTHOPEDIC ALIGNMENT USING TRACKING SENSORS

  • US 20120232834A1
  • Filed: 07/19/2011
  • Published: 09/13/2012
  • Est. Priority Date: 11/28/2005
  • Status: Active Grant
First Claim
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1. A system for positional measurements, comprising:

  • three or more ultrasonic transmitters on a first device for transmitting at a first location a first sequence of ultrasonic signals through air;

    three or more receivers on a second device for capturing the first sequence of ultrasonic signals and a second sequence of ultrasonic signals transmitted by the ultrasonic transmitters on the first device during movement to a second location;

    a phase detector on the second device operatively coupled to the receiver for identifying a series of phase differences between the first sequence of ultrasonic signals and the second sequence of ultrasonic signals; and

    a processor on the second device operatively coupled to the phase detector and a sensing unit comprising the receiver for updating an expected location of the first device using the series of phase differences, wherein the processor;

    measures a first series of Time of Flights (TOF) between the transmitting of the first sequence of ultrasonic signals and the capturing of the second sequence of ultrasonic signals, and producing therefrom the expected location of the first device at the first location,measures a second series of Time of Flights (TOF) between the transmitting of the first sequence of ultrasonic signals and the capturing of the second sequence of ultrasonic signals, and producing therefrom an estimated location of the first device at the second location,determines a relative displacement of the first device by weighting a difference of the expected location and estimated location with the phase difference, andreports a position of an orthopedic device coupled to the first device in accordance with the relative displacement, wherein the estimated location is determined from the second series of Time of Flight (TOF) measurements, and the relative displacement is evaluated within a minimized error region determined from a series of differential time of flight (dTOF) measurements.

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