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Implantable capacitive absolute pressure and temperature sensor

  • US 5,564,434 A
  • Filed: 02/27/1995
  • Issued: 10/15/1996
  • Est. Priority Date: 02/27/1995
  • Status: Expired due to Term
First Claim
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1. An implantable lead having a capacitive pressure sensor module for providing signals representative of the magnitude of body fluid pressure at a selected site and ambient operating conditions, including body temperature, at the site, said lead comprising:

  • an elongated implantable lead body having proximal and distal end sections and having first and second electrical conductors extending from the proximal end section to the distal end section, said proximal end adapted to be coupled to a biasing signal source, and said distal end section adapted to be implanted in a body position for measuring a varying body fluid pressure; and

    a pressure sensor module formed in the distal end section of the lead body and coupled to said first and second electrical conductors, the pressure sensor module of said lead comprising;

    a module housing attached to said lead body adapted to be positioned in a body cavity and enclosing a hermetically sealed chamber;

    pressure deformable pickoff capacitor means for varying in capacitance in response to variations in fluid pressure having a first plate formed of a pressure deformable diaphragm of said module housing and a second plate spaced apart therefrom;

    reference capacitor means having a first plate formed of a relatively non-deformable portion of said diaphragm of said module housing and a second plate spaced apart therefrom;

    a substrate supported within said module housing for supporting said second plates; and

    pressure and temperature signal modulating circuit means supported on said substrate within said hermetically sealed chamber and electrically coupled to said first and second electrical conductors.

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