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Systems and methods for monitoring wear and/or displacement of artificial joint members, vertebrae, segments of fractured bones and dental implants

  • US 6,583,630 B2
  • Filed: 01/31/2001
  • Issued: 06/24/2003
  • Est. Priority Date: 11/18/1999
  • Status: Expired due to Fees
First Claim
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1. A distance measurement system for monitoring displacements over a joint between two substantially electrically isolated members, the system comprising at a first one of said members at least one resonant circuit;

  • at a second one of said members at least one magnetic element having predetermined magnetic properties;

    and externally to said members;

    (c) a transmitter operable to transmit an electromagnetic pulse;

    (d) a receiver operable to detect oscillations emitted by said resonant circuit in response to said electromagnetic pulse; and

    (e) an analyzer operable to analyze an amplitude envelope property of said oscillations, to thereby determine a distance between said resonant circuit and said magnetic element, therefrom to determine a state of said elements at said joint.

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