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Method for measuring oxygen metabolism in internal organ or tissue

  • US 4,513,751 A
  • Filed: 03/11/1983
  • Issued: 04/30/1985
  • Est. Priority Date: 03/07/1979
  • Status: Expired due to Fees
First Claim
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1. A method for measuring the metabolic rate for oxygen in an internal organ or in a tissue, comprising the steps of:

  • (a) interrupting the oxygen supply to a portion of said organ or tissue to be diagnosed by applying pressure at a predetermined point;

    (b) directing light onto said portion;

    (c) sensing a first spectral characteristic of light reflected from said portion at at least one first wavelength, said first spectral characteristic varying in absorbance rapidly to a constant value following said step of interrupting said oxygen supply, and sensing a second spectral characteristic at at least one second wavelength of said reflected light, said second spectral characteristic continuing to change in absorbance after said first characteristic at said first wavelength has reached said absorbance constant value; and

    (d) determining a rate of change of said second characteristic relative to said first characteristic after said first characteristic has reached said constant absorbance level said rate of change being indicative of the metabolic rate.

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