Flash reflectance oximeter
First Claim
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1. A method of determining the oxygenation of a tissue sample by use of an apparatus having:
- a means for producing light of an intensity capable of penetrating clothing adjacent the tissue sample, such that the light is reflected by the tissue sample back through the clothing; and
a means for responding to the reflected light and for producing an output signal related to the oxygenation of the tissue sample;
the steps comprising;
placing said apparatus adjacent clothing covering the tissue of a patient;
producing light by operation of said means for producing light in a plurality of pulses such that the light penetrates the clothing of the patient and is reflected by the tissue back through the clothing; and
sensing the reflected light by operation of said means for responding and producing an output signal related to the oxygenation of the tissue; and
further comprising the step of determining the oxygenation of the tissue by comparing differences in the output signal corresponding to different pulses of produced light.
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Abstract
A small battery-operated oximeter noninvasively measures tissue oxygenation. This oximeter employs a high intensity, very short duration light pulse that penetrates clothing of a patient. A photodetector assembly of the oximeter is responsive to light reflected through clothing of the patient. The oximeter optically filters the reflected light. A ratio of the intensity of reflected red light to the intensity of reflected infrared light indicates tissue oxygenation of the patient.
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Citations
3 Claims
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1. A method of determining the oxygenation of a tissue sample by use of an apparatus having:
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a means for producing light of an intensity capable of penetrating clothing adjacent the tissue sample, such that the light is reflected by the tissue sample back through the clothing; and a means for responding to the reflected light and for producing an output signal related to the oxygenation of the tissue sample;
the steps comprising;placing said apparatus adjacent clothing covering the tissue of a patient; producing light by operation of said means for producing light in a plurality of pulses such that the light penetrates the clothing of the patient and is reflected by the tissue back through the clothing; and sensing the reflected light by operation of said means for responding and producing an output signal related to the oxygenation of the tissue; and further comprising the step of determining the oxygenation of the tissue by comparing differences in the output signal corresponding to different pulses of produced light. - View Dependent Claims (2, 3)
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Specification