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Combined flow, pressure and temperature sensor

  • US 6,343,514 B1
  • Filed: 04/06/1999
  • Issued: 02/05/2002
  • Est. Priority Date: 01/30/1996
  • Status: Expired
First Claim
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1. A device for determining pressure, temperature and a flow parameter of a flowing fluid, comprisingi) a sensor support body (13) mounted for insertion into a vessel of a living body and having a diaphragm (15) covering a cavity (14) formed in said support body (13);

  • ii) a pressure sensitive element (41), having a known temperature dependence, mounted on said diaphragm (15), and providing an output indicative of a pressure;

    iii) a temperature sensitive resistor (42) mounted in the vicinity of said pressure sensitive element (41) and having a known temperature dependence, providing an output signal indicative of a temperature, said resistor (42) also functioning as a temperature reference means for said pressure sensitive element (41); and

    iv) an electrical circuit (43, 44, 45, 46), connected to the pressure sensitive element and to the temperature sensitive resistor, for calculation of a flow parameter of said flowing fluid on the basis of the temperature signals.

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