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Method for spectrophotometric blood oxygenation monitoring of organs in the body

  • US 9,364,175 B2
  • Filed: 11/24/2010
  • Issued: 06/14/2016
  • Est. Priority Date: 11/24/2009
  • Status: Active Grant
First Claim
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1. A method for non-invasively determining a blood oxygen saturation level within tissue of an internal organ of a subject, comprising the steps of:

  • applying a near infrared spectrophotometric sensor on an external surface of the internal organ, which sensor includes at least one light source and at least one detector;

    operating the sensor to emit light from the light source at an incident light intensity directly into the tissue of the internal organ at a first tissue location, which emitted light includes a first wavelength, a second wavelength, and a third wavelength, and to sense said emitted light at a second tissue location, separated from the first tissue location, which emitted light has traveled through the tissue between the first tissue location and the second tissue location, and to produce signals representative of the intensity of the sensed emitted light;

    using a processor to execute instructions stored in a memory device, which instructions cause the processor to;

    determine an attenuation of the emitted light for each of the first, second, and signals representative of the intensity of the sensed emitted light for each said wavelength;

    determine a difference in the attenuation of the emitted light between the first wavelength and the second wavelength and between the first wavelength and the third wavelength; and

    determine a blood oxygen saturation level of the organ tissue using the difference in attenuation between the first wavelength and the second wavelength, and the difference in attenuation between the first wavelength and the third wavelength.

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