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Venous pulse oximetry

  • US 7,263,395 B2
  • Filed: 01/31/2003
  • Issued: 08/28/2007
  • Est. Priority Date: 01/31/2002
  • Status: Expired due to Fees
First Claim
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1. A method of non-invasively measuring venous oxygen saturation, comprisingapplying a pressure transducer at a first site on a body having venous and arterial systems,applying a drive signal to the pressure transducer at a predetermined frequency, to cause a series of pulsations of a predetermined magnitude in the venous blood volume in the vicinity of said first site, the magnitude of the pulsations being adjusted such that the arterial system is minimally disturbed,applying an oximeter device at a second site on the body,measuring output signals received from said oximeter device, said output signals containing a component representative of the modulation of venous blood volume due to said pulsations,deriving a measure of venous oxygen saturation from the frequency response of said output signals.

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