Hematocrit measurement by differential optical geometry in a sho

Details Hematocrit measurement by differential optical geometry in a sho Hematocrit measurement by differential optical geometry in a sho

1987-03-23

1988-10-11

Kamm, William E.

Surgery

Truss

Pad

A61B 500

Patent

active

047763400

ABSTRACT:
An optical fiber carries a light beam through a cardiovascular catheter and projects the beam into the patient's bloodstream. Two other fibers, spaced in a very carefully controlled configuration from the first, receive light scattered by corpuscles (and blood-vessel walls) and transmit this reflected light back through the catheter to respective detectors outside the patient's body. If preferred, two input fibers and a single output fiber--or other techniques for providing differential geometry--may be used instead. Electronic instrumentation finds the ratio of the two light fluxes, thus cancelling out unknown variables such as input light intensity and optical--connector attenuation. The known differential geometry between the two light paths permits calibration of the ratio measurement in terms of corpuscular concentration--i.e., hematocrit. Light at only one wavelength suffices for the measurement. Advanced forms of the invention correct for proximity of blood-vessel walls. This system is particularly compatible with optical-fiber measurements of oxygen saturation, as either or both of the light paths already provided may be used for the oxygen reflectometry.

REFERENCES:
patent: 4623248 (1986-11-01), Sperinde
Spectrophotometric Monitoring of Arterial Oxygen Saturation in the Fingertip by Yoshiya, Shimada, Tanaka in Medical & Bio. Eng. & Computing Jan. 1980.

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