Adaptive threshold waveform peak valley identification method and device

Abstract

The invention discloses a waveform peak and trough identifying method with self-adapting threshold and a device thereof. The identifying method comprises following steps: A1. multilevel amplitude thresholds are set up, including a smallest amplitude threshold Ymin, a largest amplitude threshold Ymax, a threshold step length S and a threshold level N, N equals to the result of Ymax subtracted by Ymin then divided by S, and finally added by 1, and the nth level amplitude threshold Yn equals to Ymin added by the result of n subtracted by 1 and then multiplied by S; B1. information of local wave peaks and local wave troughs in the waveform is searched; C1. a threshold of vibration amplitude of the local wave peaks or the local wave troughs is determined, and if the vibration amplitude of the local wave peaks or the local wave troughs is more than a certain amplitude threshold, the vibration amplitude is taken as a threshold wave peak or a threshold wave trough of the amplitude threshold in the level; D1. vibration amplitude threshold and time threshold of the threshold wave peaks and the threshold wave troughs are determined, and effective wave peaks and effective wave troughs are determined. The waveform peak and trough identifying method with self-adapting threshold and the device thereof have high wave form identifying rate, improved disturbance resisting capacity and increasedclinical limitation of wave trough identification, and is fit for real clinical situations.

Description

【Technical field】 [0001] The invention relates to a method and device for identifying peaks and valleys of waveforms, in particular to a method and device for identifying peaks and valleys of waveforms with adaptive thresholds. 【Background technique】 [0002] During some cardiac operations and other major operations, it is of great clinical value to monitor blood pressure in real time, which requires the use of invasive blood pressure monitoring technology. The basic principle of invasive pressure measurement is to firstly put the catheter through the puncture and implant it into the blood vessel of the measured part. The extracorporeal port of the catheter is directly connected with the pressure sensor, and physiological saline is injected into the catheter. The pressure will be transmitted to the external pressure sensor through the fluid in the catheter, so that the dynamic waveform of the pressure change in the blood vessel can be obtained in real time, and the systolic ...

AI Technical Summary

Problems solved by technology

[0004] 1. The waveform recognition rate is not high, the anti-interference ability is poor, and it is easy to misdetect and miss detection of peaks and valleys

[0005] 2. Lack of clinical constraints on the judgment of peaks and valleys, resulting in a mismatch in the number of peaks and valleys (that is, the number of systolic blood pressure and diastolic blood pressure does not match), and continuous peaks or continuous troughs occur, which does not conform to the actual clinical situation

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