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Digital signal process method for light- frequency conversion type pulse blood oxygen instrument

A digital signal processing, pulse oximeter technology, applied in medical science, sensors, diagnostic recording/measurement, etc., can solve problems such as power consumption and dynamic range adjustment, measurement technical difficulties, etc., to achieve low cost and power consumption, improve Signal-to-noise ratio, small size effect

Active Publication Date: 2008-08-06
XI AN JIAOTONG UNIV
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Problems solved by technology

[0011] Aiming at the measurement technical difficulties caused by the limitation of the conversion frequency range of the existing LFC, the present invention proposes a digital signal processing method based on a fixed number pulse train cumulative timing, which can effectively solve the aforementioned problems in measuring the output pulse frequency and period of the LFC. The problems encountered in speed, power consumption and dynamic range adjustment can meet the requirements of professional-grade pulse oximeter anti-interference characteristics and measurement accuracy under weak perfusion conditions at a very low cost

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  • Digital signal process method for light- frequency conversion type pulse blood oxygen instrument
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Embodiment Construction

[0029] Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail:

[0030] Such as figure 1 As shown, a light-frequency conversion digital pulse oximeter includes a red light-emitting tube 3, an infrared light-emitting tube 4, and a liquid crystal display 6. The two outputs of the LED are electrically connected, and the input of the light-emitting tube driver 2 is connected to the signal of the microprocessor 1. The microprocessor 1 is a microprocessor containing a capture logic interface, a general serial interface and a liquid crystal display drive circuit. The microprocessor The capture logic interface of the device 1 is connected to the optical frequency converter 5, the liquid crystal display drive output port of the microprocessor 1 is connected to the display drive input port of the liquid crystal display 6, and the general serial interface of the microprocessor 1 can be connected to the central processing system ...

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Abstract

A method for processing the digital signals of a light-frequency conversion type pulse oxyhemograph includes such steps as using a light-frequency converter to directly convert the light signals received by human tissue to the electric pulse signals, using microprocessor to count the electric pulse signals and time, and calculation to digital signals to obtain the blood oxygen saturation degree and cardiac rhythm value.

Description

technical field [0001] The invention relates to a digital signal processing method of a digital pulse oximeter, in particular to a digital signal processing method of an optical-frequency conversion pulse oximeter. Background technique [0002] Pulse oximeter is a non-invasive medical instrument that continuously monitors the oxygen saturation of human arterial blood. It has become a routine equipment for anesthesia monitoring and intensive care in hospitals, and is also widely used in various mobile monitoring and sleep monitoring outside hospitals. . The development of home and community health care systems has put forward new requirements for the design and manufacture of pulse oximeters, that is, it is hoped that low-cost, high-performance wearable pulse oximeters can be widely used in home and community medical networks. [0003] The pulse oximeter works on the basis of oxygenated hemoglobin (HbO 2 ) and reduced hemoglobin (Hb) have different absorption spectrum chara...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B5/1455
Inventor 孙卫新金捷郭萍杨新平孔澍
Owner XI AN JIAOTONG UNIV
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