Blood parameter measurement
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United States of America Patent
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Sep 17, 1991
Grant Date -
N/A
app pub date -
Mar 3, 1989
filing date -
Mar 3, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for measuring the oxygen saturation level and hematocrit of human blood in real time. A catheter having a notch in its tip is inserted into a blood vessel and guided to a desired location in the body of a patient. Bursts of light at each of three wavelengths are transmitted through the blood in the notch. The intensities of the bursts of light after transmission are utilized along with a set of molecular exinction coefficients and optical scattering coefficients to calculate the oxygen level and hermatocrit. The light is provided by a set of LEDs in a housing connected to the catheter and the intensity of the transmitted light is measured by a photocell in the same housing. Optical fibers transmit the light through the catheter between the housing and the notch. Characterization resistors in the housing are encoded with characteristics such as the wavelengths of the LEDs and the width of the notch. In an alternate embodiment blood circulating through a loop out of the patient's body is passed through a chamber and is exposed to the light.
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