Integrated chip for detecting human body oxyhemoglobin saturation

Abstract

The invention provides an integrated chip for detecting human body oxyhemoglobin saturation. The integrated chip comprises a red light diode driving circuit, a red light photoelectric transducer, a first current-voltage conversion circuit, an infrared light diode driving circuit, an infrared light photoelectric transducer, a second current-voltage conversion circuit, an analog-digital conversion circuit and a digital signal processing circuit. The red light diode driving circuit is connected with a red light diode. The output end of the red light photoelectric transducer is connected with the first current-voltage conversion circuit. The output end of the first current-voltage conversion circuit is connected with the analog-digital conversion circuit. The infrared light diode driving circuit is connected with an infrared light diode. The output end of the infrared light photoelectric transducer is connected with the second current-voltage conversion circuit. The integrated chip has the advantages that an application circuit is simplified, the equipment for measuring human body oxyhemoglobin saturation is greatly miniaturized, and the cost is reduced.

Description

technical field [0001] The invention relates to a detection device, in particular to an integrated chip for detecting blood oxygen saturation of a human body. Background technique [0002] Mobile health and personal portable medical monitoring are one of the important components of my country's future medical and health system. Being able to continuously monitor individuals for a long time, and to be able to detect sudden illnesses or abnormal physiological conditions of the wards in a timely manner will be one of the important requirements for the development of medical and health services in the future. The real-time and universality of this application requires that this new monitoring system should have the characteristics of portability, miniaturization, integration and low power consumption. [0003] At present, the equipment for detecting blood oxygen saturation mostly adopts a separate circuit board-level circuit, and the light change received through transmission o...

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Problems solved by technology

[0003] At present, the equipment for detecting blood oxygen saturation mostly adopts a separate circuit board-level circuit, and the light change received through transmission or reflection is converted into an electrical pulse signal, which is processed by a current-voltage conversion circuit, an amplification circuit, and a low-pass filter circuit to obtain a volume pulse. Wave signal, the blood oxygen saturation value is obtained by algorithmic processing of two volume pulse waves; this method has complex analog circuits, large board-level occupation area, and is not convenient for miniaturization and integration of equipment

There is also a digital blood oxygen saturation measurement method, using the light-frequency conversion method, using the light-frequency converter to convert the received light signal into an electrical pulse signal whose frequency is proportional to the light intensity, and performing frequency technology on the pulse signal. Carry out digital signal processing to obtain the blood oxygen saturation value of the human body; however, the frequency range of the currently available optical-frequency converter is below 1MHz. To make the frequency technology achieve the required resolution, it is necessary to automatically adjust the driving current of the light-emitting tube, so that For any thickness of human tissue, the output pulse of the light-to-frequency converter has sufficient pulse width to maintain the accuracy of the period measurement, but to do this, the driving current and the light pulse intensity will be adjusted to a very high level when the tissue thickness is thin. Small, will lead to a serious decrease in signal-to-noise ratio

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