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Pressure sensor element and method to measure contact stress

  • US 5,125,408 A
  • Filed: 09/19/1991
  • Issued: 06/30/1992
  • Est. Priority Date: 10/24/1988
  • Status: Expired due to Term
First Claim
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1. A method of measuring in vivo contact stress applied to an implanted pressure sensor element which comprises:

  • (a) implanting a pressure sensor element into a situs of a subject, said pressure sensor element having an NMR spectrum which changes in response to pressures applied to said pressure sensor element;

    (b) non-invasively subjecting the subject situs to a nuclear magnetic resonance source to obtain an NMR spectrum of said pressure sensor element; and

    (c) determining in vivo contact stress applied to said pressure sensor element from said NMR spectrum obtained in step (b).

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