Apparatus for obtaining an objective determination of the rate of oxygen utilization in peripheral tissue
First Claim
1. A non-invasive, spectrometric measuring apparatus for objective in vivo determination of the rate of oxygen utilization in peripheral tissue, comprising:
- tissue encircling clamping means for isolating a segment of blood in the tissue of the skin to thereby produce a state of occlusion whereby oxygen absorption may be analyzed,means for detecting coefficients of absorption for oxyhemoglobin in said tissue in at least first and second wavelength regions after occlusion and during a time interval, said first and second wavelength regions having different rates of change of absorption coefficient when said tissue is in an occluded state, said means for detecting providing electrical output values indicative of the absorption coefficient in said first and second wavelength regions during the time interval, andmeans coupled to the output of said detection means for determining the rate of change of said absorption coefficient in said first wavelength region relative to the rate of change of said absorption coefficient in said second wavelength region and for producing an output therefrom which is indicative of the rate of oxygen utilization in said tissue.
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Abstract
Apparatus employing a non-invasive method for objectively determining in vivo, the rate of oxygen utilization in peripheral tissue by spectral measuring means, containing a light source, a clamp or tourniquet for occluding a segment of blood in the tissue, means for transmitting the light through the isolated segment of blood to pick up the spectral values of the oxyhemoglobin for two selected wavelengths, wherein the rate of reduction of the oxyhemoglobin of the blood as determined at one wavelength is faster that the rate of reduction of the oxyhemoglobin at the other wavelength, means for converting the spectral values individually for the two selected wavelengths into current flow, and means for determining the time-space relationship between the changing spectral values of the two selected wavelengths, from the moment of occlusion.
26 Citations
10 Claims
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1. A non-invasive, spectrometric measuring apparatus for objective in vivo determination of the rate of oxygen utilization in peripheral tissue, comprising:
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tissue encircling clamping means for isolating a segment of blood in the tissue of the skin to thereby produce a state of occlusion whereby oxygen absorption may be analyzed, means for detecting coefficients of absorption for oxyhemoglobin in said tissue in at least first and second wavelength regions after occlusion and during a time interval, said first and second wavelength regions having different rates of change of absorption coefficient when said tissue is in an occluded state, said means for detecting providing electrical output values indicative of the absorption coefficient in said first and second wavelength regions during the time interval, and means coupled to the output of said detection means for determining the rate of change of said absorption coefficient in said first wavelength region relative to the rate of change of said absorption coefficient in said second wavelength region and for producing an output therefrom which is indicative of the rate of oxygen utilization in said tissue. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification