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Strain monitoring system and apparatus

  • US 8,529,474 B2
  • Filed: 11/29/2011
  • Issued: 09/10/2013
  • Est. Priority Date: 07/08/2004
  • Status: Active Grant
First Claim
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1. An apparatus for sensing strain, comprising:

  • a sensor;

    said sensor comprising an inter-digitated area variation capacitor;

    wherein said sensor comprises a plurality of free-standing inter-digitated fingers; and

    wherein lateral movement of the inter-digitated fingers produces a change in capacitance detected by said sensor;

    a transmitter;

    said transmitter coupled to said sensor; and

    an antenna;

    said antenna coupled to said transmitter;

    wherein said sensor, said transmitter, and said antenna are adapted for implantation in a biological host;

    wherein the sensor is configured to be coupled to an internal body member of the host;

    wherein said sensor, said transmitter, and said antenna are adapted for monitoring said change in capacitance to measure a characteristic of loading on said body member.

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