Method and device for measuring blood oxygen saturation
A technology of saturation and blood oxygen, which is applied in the field of measuring human blood oxygen saturation, can solve the problems of noise signal, inaccurate measurement of blood oxygen saturation, no instrument to improve anti-motion noise, etc.
Active Publication Date: 2009-02-25
BEIJING M&B ELECTRONIC INSTR CO LTD +1
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Problems solved by technology
However, when the two photocurrent components are obtained, there are often noise signals, such as electromagnetic noise, background light noise and motion noise, etc.
These noisy signals make blood oxygen saturation measurements inaccurate
At present, there are different noise elimination methods for different noise effects, such as using light shielding or changing the light absorption coefficient of the illuminated surface to eliminate background light noise, using electromagnetic shielding to eliminate electromagnetic interference, and improving the mechanical anti-motion performance of the probe to eliminate the measured object. Motion interference with the probe, especially for motion noise, currently there is only a mechanical method similar to the above to eliminate the noise, without improving the ability to resist motion noise from the circuit signal processing of the instrument itself
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[0037] Preferred embodiments of the present invention will be specifically described below in conjunction with the accompanying drawings. Such as figure 1 Shown is a schematic diagram of the structure of the blood oxygen saturation measuring device of the present invention. The device of the present invention includes a central control processing unit 1, a multi-wavelength optical drive unit 2, a light emitting device 3, a photoelectric receiving device 4, a signal amplifier 5, an A / D analog-to-digital conversion unit 6, and a display device 7, wherein the central control processing unit 1 sends a control signal to the multi-wavelength optical drive unit 2, so that the unit sends a drive signal, and drives the light generating device 3 to send out an optical signal. In this embodiment, two light emitting devices are used, one of which emits red light with a wavelength of 660nm, the other emits infrared light with a wavelength of 820-940nm. These two beams of light irradiate t...
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The application discloses a method for measuring oxygen saturation degree of blood, comprising the following steps of (1) direct current filtering and pre-processing the measured digital signals after analog-digital conversion; (2) wave filtering by an aliasing-resistant filter and signals extraction; (3) quick Fourier FFT transformation and elimination of motion interference signals; (4) calculation of oxygen saturation degree of blood. And after the elimination of motion interference signals and before the calculation of oxygen saturation degree of blood, a step can be added in the method, namely, the range of double frequency is more eliminated than that of base frequency; elimination of excursion by a lowpass can be also added in the method before the calculation of oxygen saturation degree of blood. The invention also discloses an instrument for measuring the oxygen saturation degree of blood with the method. The method and the instrument of the invention can quickly and effectively measure the oxygen saturation degree of blood, and an extraction technique is added in the invention, helping largely reduce the space for use and amount in calculation of an EMS memory. Waveshape recognition on the frequency domain helps filter the interference of motion state effectively and improve the accurateness of measurement by the instrument.
Description
technical field [0001] The invention relates to a method and a device for measuring the blood oxygen saturation of a human body, in particular to a method and a device for measuring the blood oxygen saturation in the frequency domain without trauma and using spectral analysis technology. Background technique [0002] Blood oxygen saturation refers to the percentage of oxyhemoglobin molecules in the human arterial blood to the total number of hemoglobin molecules. It is an important physiological parameter reflecting the oxygen supply status of the human body and an important clinical indicator. At present, non-invasive technology is mainly used to measure and monitor blood oxygen saturation, which overcomes the original invasive method of drawing blood samples, increasing patient pain and high infection rate. The basic principle of non-invasive measurement of blood oxygen saturation is to use the spectral analysis method to place two photocells emitting different spectra on ...
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IPC IPC(8): A61B5/1455G06F17/14
Inventor 刘志文刘忠英王群李龠
Owner BEIJING M&B ELECTRONIC INSTR CO LTD