Digital oximeter
First Claim
1. A digital oximeter for noninvasively measuring oxygen saturation of the arterial blood comprising:
- means for measuring light intensity after contact with living tissue to produce at least first and second time-spaced signals representative of the intensity of measured light at a first wavelength and first and second time-spaced signals representative of the intensity of measured light at a second wavelength;
means for correspondingly storing each of said first signals;
means for practicing subtractions between said first and second time-spaced signals of a first wavelength, and between said first and second time-spaced signals of a second wavelength to correspondingly produce at least first and second subtraction outputs, respectively; and
means for processing at least said first signals from the storing means and said first and second subtraction outputs from the subtraction practicing means to indicate the oxygen saturation.
0 Assignments
0 Petitions
Accused Products
Abstract
A digital oximeter for noninvasively measuring oxygen saturation of the arterial blood is provided. Photoelectric transducers measure the light intensity after passing through living tissue to produce at least a pair of output signals of different wavelengths of light. A sample hold circuit is provided for correspondingly storing each of the respective output signals. A microprocessor controlled pulse activates a subsequent subtraction step between a second measurement taken for each of the respective wavelengths to correspondingly produce at least a first and second subtraction output. The circuit can then process at least the first and second stored light outputs and the first and second subtraction outputs to indicate the oxygen saturation.
300 Citations
5 Claims
-
1. A digital oximeter for noninvasively measuring oxygen saturation of the arterial blood comprising:
-
means for measuring light intensity after contact with living tissue to produce at least first and second time-spaced signals representative of the intensity of measured light at a first wavelength and first and second time-spaced signals representative of the intensity of measured light at a second wavelength; means for correspondingly storing each of said first signals; means for practicing subtractions between said first and second time-spaced signals of a first wavelength, and between said first and second time-spaced signals of a second wavelength to correspondingly produce at least first and second subtraction outputs, respectively; and means for processing at least said first signals from the storing means and said first and second subtraction outputs from the subtraction practicing means to indicate the oxygen saturation. - View Dependent Claims (2, 3, 4, 5)
-
Specification