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Disposable pressure transducer and disposable pressure transducer apparatus

  • US 5,097,841 A
  • Filed: 09/18/1989
  • Issued: 03/24/1992
  • Est. Priority Date: 09/22/1988
  • Status: Expired due to Term
First Claim
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1. A disposable pressure transducer for measuring fluid pressure, connectable to external display means for displaying said measured fluid pressure, comprising:

  • a housing including a fluid chamber having;

    at least one inner wall surface;

    an inlet having a given cross-sectional area;

    an outlet having a cross-sectional area smaller than said cross-sectional area of said inlet;

    a sensor accommodating chamber;

    an aperture between said fluid chamber and said sensor accommodating chamber; and

    said at least one inner wall surface of said fluid chamber being hydrophilic;

    said fluid chamber and said sensor accommodating chamber being formed integrally with each other;

    a sensor assembly mounted in said sensor accommodating chamber having;

    an insulating board;

    a semiconductor sensor chip mounted on said insulating board for converting pressure into a sensor output signal;

    integrated circuit means mounted on said insulating board for processing said sensor output signal into a pressure signal;

    a cylindrical coupling lid having an interior and a mouth leading into said interior, said coupling lid being mounted in said aperture and on said insulating board to surround said semiconductor sensor chip;

    said mouth of said coupling lid having a selected cross-sectional area;

    a pressure transmitting medium in said interior of said coupling lid to provide electrical insulation between said fluid chamber and said semiconductor sensor chip;

    electrical connector means for electrically connecting said insulating board to said external display means;

    said semiconductor sensor chip including a diaphragm portion having a preselected cross-sectional area; and

    the ratio of said selected cross-sectional area of said mouth of said lid to said predetermined cross-sectional area of said diaphragm being at least 5;

    1.

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