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HEARTBEAT TRANSDUCER FOR A MONITORING DEVICE

  • US 3,682,161 A
  • Filed: 02/20/1970
  • Issued: 08/08/1972
  • Est. Priority Date: 02/20/1970
  • Status: Expired due to Term
First Claim
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1. A contact device to be employed with a heartbeat monitorinG system comprising in combination:

  • housing means having a cavity and at least one aperture formed therein;

    pad member means mounted to fill said aperture having an inner surface lying toward said cavity and an outer surface lying away from said cavity;

    inner support means mounted taut across said aperture in abutment with said inner surface of said pad member;

    outer support means mounted taut across said aperture in abutment with said outer surface of said pad member to hold said pad member packed tightly between said inner support means and said outer support means;

    piezoelectric crystal means;

    means for coupling said piezoelectric crystal means to said inner support means whereby said piezoelectric crystal means generate electrical signals in response to heartbeat forces applied to said outer support means; and

    circuitry means mounted in said cavity and connected to said piezoelectric crystal means and adapted for further connection to utility means.

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