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Pressure sensing catheter

  • US 4,924,877 A
  • Filed: 11/25/1988
  • Issued: 05/15/1990
  • Est. Priority Date: 11/25/1988
  • Status: Expired due to Fees
First Claim
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1. A sensor for a pressure sensing catheter, said sensor having a longitudinal axis and a periphery, a first and a second optical fiber segment having light transmitting faces spaced from one another across a gap, a shutter having a shutter segment projecting into said gap between said faces, and also having a cantilever segment anchored to the sensor at one end, with said shutter segment projecting laterally therefrom at its other end and flexibly deflectable to move said shutter segment variably into said gap as a consequence of said deflection;

  • a pressure membrane laid atop the cantilever segment and closing said gap; and

    a circumferential pressure transmitting membrane extending fully around the catheter on both sides of said gap, and enveloping a chamber filled with fluid between said membranes, said circumferential pressure transmitting membrane being normally spaced from said pressure membrane.

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