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Catheter

  • US 4,456,013 A
  • Filed: 09/08/1981
  • Issued: 06/26/1984
  • Est. Priority Date: 09/08/1981
  • Status: Expired due to Fees
First Claim
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1. A catheter for measuring pressure fluctuations within the body, comprisinga tube having one end suitable for insertion into a body organ,a transducer located at said end, said transducer comprisinga flexible piezoelectric polymeric membrane having an interior surface facing the interior of said tube and an exterior surface facing the exterior of said tube,a pair of surface electrodes mounted on said membrane,said tube end having a cavity,said membrane being supported above said cavity at the periphery of the membrane so that said membrane is unsupported in the region where it overlies said cavity, andsaid cavity being sufficiently large to permit unobstructed inward flexing of said membrane in response to pressure fluctuations in said organ, andmeans for transmitting from said electrodes to external circuitry electrical signals produced by said flexing.

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