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Piezoelectric apparatus for measuring bodily fluid pressure within a conduit

  • US 4,600,855 A
  • Filed: 05/30/1985
  • Issued: 07/15/1986
  • Est. Priority Date: 09/28/1983
  • Status: Expired due to Fees
First Claim
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1. In a system for measuring bodily fluid pressure, a transducer connectable to a dome containing fluid under pressure, said fluid under pressure being hydraulically coupled to the source of said bodily fluid, said dome having a first diaphragm which flexes in response to variations in fluid pressure, said transducer comprising:

  • a housing connectable to said dome;

    a plate having at least one natural resonant frequency which varies as mechanical stress applied to it varies;

    means for connecting said plate between said housing and said first diaphragm to apply varying stress to said plate as said first diaphragm flexes;

    a pair of piezoelectric sheet transceivers, each in intimate contact with a respective portion of said plate;

    electronic means for energizing one of said piezoelectric transceivers to vibrate said plate at its resonant frequency; and

    said other piezoelectric transducer producing a signal proportional to the frequency of vibrations of said plate, said signal thereby being indicative of said bodily fluid pressure.

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