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Photoplethysmograph signal-to-noise line enhancement

  • US 20020169381A1
  • Filed: 06/11/2002
  • Published: 11/14/2002
  • Est. Priority Date: 04/18/2000
  • Status: Active Grant
First Claim
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1. In a photoplethysmograph for characterizing blood volume of the type having a light source and a detector disposed about a region of body tissue containing a specified blood vessel, an improvement comprising a pressure member for selectively pressurizing the specified blood vessel.

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