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Method of measuring respiration and respiratory effort using plural catheters

  • US 5,810,741 A
  • Filed: 12/21/1995
  • Issued: 09/22/1998
  • Est. Priority Date: 11/05/1992
  • Status: Expired due to Fees
First Claim
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1. A method of determining existence and location of an obstruction in a respiratory track comprising the steps of:

  • introducing a first catheter into the respiratory track so that a first sensing site is positioned distal to the obstruction, by inserting the first catheter into the respiratory track until signals from the first catheter indicative of respiratory effort cease to occur, indicating that the first catheter has been pushed to a distal side of said obstruction;

    using the first catheter to monitor respiratory effort with signals generated at said first sensing site indicative of the respiratory effort;

    positioning a second catheter in the respiratory track so that a second sensing site is near nostrils;

    using the second catheter to monitor actual respiration with signals from the second catheter generated at said second sensing site indicative of the actual respiration; and

    verifying existence of the obstruction by observing respiratory effort signals without corresponding actual respiration signals.

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