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Measuring instrument for intracardial acquisition of blood oxygen saturation

  • US 4,830,488 A
  • Filed: 05/20/1987
  • Issued: 05/16/1989
  • Est. Priority Date: 06/16/1986
  • Status: Expired due to Term
First Claim
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1. A measuring instrument for intracardial acquisition of the blood oxygen saturation of a patient for use with an evaluation circuit having two leads, said measuring instrument comprising:

  • means for transmitting light;

    means connected across said leads for receiving light from said means for transmitting light reflected by said blood at a level indicative of the oxygen saturation of said blood; and

    a constant current source connected in series with said means for transmitting light across said leads.

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