Blood constituent measuring device and method
First Claim
Patent Images
1. A method of detecting the oxygen saturation in the blood of living tissue, comprising:
- (a) sequentially passing light of red frequency through the living tissue;
(b) sequentially passing light of infrared frequency through the living tissue;
(c) detecting the amplitude of light of red frequency transmitted through the tissue and providing electrical signals in response to such amplitude;
(d) detecting the amplitude of light of infrared frequency transmitted through the tissue providing electrical signals in response to such amplitude; and
(e) instantaneously and electronically platting said red light produced electrical signals against said infrared light produced electrical signals to obtain an output signal responsive to a slope of such plotted signals such that said slope is an indication of the oxygen saturation of blood in the tissue.
0 Assignments
0 Petitions
Accused Products
Abstract
A method and device are disclosed for the detection of the relative percentage of at least one light absorber in the blood stream of living tissue. The method and device are based upon the employment of a narrow band width amplifier and pulses of different wavelength light sources wherein the frequency of the pulses of the light sources are selected so that a large component of the signal falls within the frequency of the narrow band amplifier, so that there is reduced likelyhood of interference from extraneous electromagnetic waves.
226 Citations
4 Claims
-
1. A method of detecting the oxygen saturation in the blood of living tissue, comprising:
-
(a) sequentially passing light of red frequency through the living tissue; (b) sequentially passing light of infrared frequency through the living tissue; (c) detecting the amplitude of light of red frequency transmitted through the tissue and providing electrical signals in response to such amplitude; (d) detecting the amplitude of light of infrared frequency transmitted through the tissue providing electrical signals in response to such amplitude; and (e) instantaneously and electronically platting said red light produced electrical signals against said infrared light produced electrical signals to obtain an output signal responsive to a slope of such plotted signals such that said slope is an indication of the oxygen saturation of blood in the tissue. - View Dependent Claims (2, 3, 4)
-
Specification