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Passive biotelemetry

  • US 6,692,446 B2
  • Filed: 03/20/2001
  • Issued: 02/17/2004
  • Est. Priority Date: 03/21/2000
  • Status: Expired due to Term
First Claim
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1. A biotelemetry system for measuring a physiological variable within a living body, including a radio frequency transmitter to be disposed outside of the body, a radio frequency energy receiver to be disposed outside of the body, and a transponder unit including a sensor sensitive to the physiological variable, wherein the transponder unit is characterised by a modulator unit for controlling radio frequency energy absorption of the transponder unit according to a time-sequence representing said physiological variable, the transponder unit being disposed on a guide wire.

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