METHOD FOR MEASURING BLOOD OXYGEN CONTENT UNDER LOW PERFUSION
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Abstract
A method for measuring blood oxygen content under low perfusion, which is used in a device for measuring blood oxygen content, includes the steps of: initializing the device that is applied with power, collecting and processing data with a driving circuit of light emitting device, a bias circuit, a gain circuit and an A/D sampling circuit, which are controlled under a cone control module; calculating blood oxygen saturation based on the collected data with a data processing module which integrates the collected data in a period of time with an area integration method; and outputting from a communication functional module results of the blood oxygen saturation or pulse rate calculated with the data processing module. The method further includes a decision step of deciding the two results acquired from the data processing module with the waveform method and the integration method respectively based on the intensity of the measured signal and generating the final measured result, performed by a decision unit included in the device. By adopting the above method, the disturbance to effective signal by noise can be eliminated. As a result, the measuring accuracy of blood oxygen content under low perfusion can be improved without increasing the production cost for the measuring device.
11 Citations
41 Claims
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1-17. -17. (canceled)
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18. A method for measuring blood oxygen content under low perfusion, the method comprising:
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collecting, in a patient monitoring device, data representative of an intensity of light of two different wavelengths attenuated by body tissue, wherein the collected data is cyclical to indicate blood pulsing through the body tissue; integrating the collected data over a period of time that includes more than one cycle; and determining, based at least in part on the integration of the collected data, a first value of blood oxygen saturation. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A patient monitoring device for measuring blood oxygen content under low perfusion, the device comprising:
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a sensor to collect data representative of an intensity of light of two different wavelengths attenuated by body tissue, wherein the collected data is cyclical to indicate blood pulsing through the body tissue; and a data processing circuit to; integrate the collected data over a period of time that includes more than one cycle; and determine, based at least in part on the integration of the collected data, a value of blood oxygen saturation. - View Dependent Claims (29, 30, 31, 32, 33, 34)
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35. A system for measuring blood oxygen content under low perfusion, the system comprising:
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means for collecting data representative of an intensity of light of two different wavelengths attenuated by body tissue, wherein the collected data is cyclical to indicate blood pulsing through the body tissue; means for integrating the collected data over a period of time that includes more than one cycle; and means for determining, based at least in part on the integration of the collected data, a first value of blood oxygen saturation. - View Dependent Claims (36, 37, 38, 39, 40, 41)
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Specification