Method and apparatus for eliminating interference in pulse oxygen measurement
First Claim
1. A method for eliminating interference in oxygen content measurement, comprising:
- collecting a first wavelength light and a second wavelength light transmitting through an object to be measured, and converting collected signals into electric signals to form a plethysmogram;
normalizing the plethysmogram and decomposing the normalized plethysmogram into a combination of an ideal plethysmogram and a noise component and to expand the ideal plethysmogram by using functions that make up an orthonormal system;
eliminating the noise component in the plethysmogram by performing at least one differentiation operation upon the plethysmogram, in which the noise component comprises a first noise component caused by motion or movement of the object during the oxygen content measurement, and a constant corresponding to the first noise component is generated by performing the at least one differentiation operation;
and restoring the plethysmogram without the noise component through an integration operation.
1 Assignment
0 Petitions
Accused Products
Abstract
The present invention discloses a method and apparatus for eliminating interference in pulse oxygen measurement. The method comprises the steps of: collecting a first wavelength light and a second wavelength light transmitting through the object to be measured and converting collected optic signals into electric signals to form a plethysmogram; processing the plethysmogram so as to normalize it, in order to decompose the normalized plethysmogram into a combination of an ideal plethysmogram and noise, and expand the ideal plethysmogram by using functions that can make up a complete orthonormal system; eliminating the noise in the plethysmogram through differential operation; and restoring the plethysmogram free of noise through integral operation for calculating oxygen saturation. The apparatus comprises a collecting module, a processing module, a noise eliminating module, and a restoring module. The method and apparatus suitable for the measurement of oxygen saturation under weak perfusion and movement conditions.
-
Citations
20 Claims
-
1. A method for eliminating interference in oxygen content measurement, comprising:
-
collecting a first wavelength light and a second wavelength light transmitting through an object to be measured, and converting collected signals into electric signals to form a plethysmogram; normalizing the plethysmogram and decomposing the normalized plethysmogram into a combination of an ideal plethysmogram and a noise component and to expand the ideal plethysmogram by using functions that make up an orthonormal system; eliminating the noise component in the plethysmogram by performing at least one differentiation operation upon the plethysmogram, in which the noise component comprises a first noise component caused by motion or movement of the object during the oxygen content measurement, and a constant corresponding to the first noise component is generated by performing the at least one differentiation operation; and restoring the plethysmogram without the noise component through an integration operation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. An apparatus for eliminating interference in pulse oxygen measurement, comprising:
-
a collecting module including a luminotron and a corresponding phototube that is adapted to collect a first wavelength light and a second wavelength light transmitting through an object to be measured and is adapted to convert collected signals into electric signals to form a plethysmogram; a processing module that is adapted to normalize the plethysmogram and decompose the plethysmogram into a combination of an ideal plethysmogram and a noise component and is adapted to expand the ideal plethysmogram by using at least functions that make up an orthonormal system; a noise eliminating module that is adapted to eliminate the noise component in the plethysmogram through at least a differentiation operation including a differential operator, in which the noise component comprises a first noise component caused by motion or movement of the object during the oxygen content measurement, and a constant corresponding to the first noise component is generated by performing the at least one differentiation operation; and a restoring module that is adapted to restore the plethysmogram without the noise component through an integral operation. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
-
Specification