Method and device for improving accuracy of non-invasive blood pressure (NIBP) measurement

Abstract

The invention relates to the technical field of medical care, in particular to a method and a device for improving accuracy of non-invasive blood pressure (NIBP) measurement. The method comprises the following steps: converting original pressure signals to digital pressure signals, respectively carrying out high-pass digital filtering, low-pass digital filtering and storage on the digital pressure signals, analyzing pulse signals obtained by high-pass digital filtering and cuff pressure signals obtained by low-pass digital filtering and judging whether the signals are abnormal or not; if abnormal, extracting the stored corresponding digital pressure signal and judging whether the digital pressure signal is abnormal or normal; if abnormal, outputting abnormal information; if normal, extracting the signal and carrying out comprehensive computation and analysis to obtain data results. In the method and the device provided by the invention, since digital signal filtering is adopted, the introduction of electrical noise is reduce and filtering performance is optimized; and the original digital pressure signals are stored. thereby facilitating backtrack and analysis and ensuring the accuracy and stability of the NIBP measurement.

Description

technical field [0001] The invention relates to the technical field of medical monitoring, in particular to a method and a device for improving the accuracy of non-invasive blood pressure (NIBP) measurement. Background technique [0002] As we all know, the process of non-invasive blood pressure (NIBP) measurement using the principle of oscillation method is as follows: first, inflate and pressurize the cuff wrapped around the subject's arm or other limbs until the arterial vessel is blocked; then control the cuff to gradually deflate in steps , when the pressure in the cuff drops to a certain level, the blood starts to flow in the blood vessel. As the pressure drops, the blood flow increases, and at the same time, the amplitude of pressure pulse fluctuations in the cuff increases until the maximum value; when the pressure drops further, the amplitude of fluctuations begins to decrease. An envelope curve can be obtained according to the variation of the pressure fluctuation...

AI Technical Summary

Problems solved by technology

[0012] 1) The number of digits of the analog-to-digital converter is low, and the input dynamic range is small, and the resolution is poor;

[0013] 2) The circuit is more complex and may introduce large electrical noise;

[0014] 3) The performance of the hardware filter is low, the filtering effect is not good, and it is difficult to upgrade and adjust;

[0015] 4) The two signals of cuff pressure and pulse wave are processed and collected separately in the circuit, and the information and details of the original pressure signal cannot be fully obtained

However, this further increases the complexity of the circuit, and cannot overcome the disadvantages of low performance of hardware filters, separation of cuff pressure and pulse wave signals, and loss of original information.

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