Adaptive threshold waveform peak valley identification method and device

A technology of self-adaptive threshold and identification method, applied in catheters, cardiac catheters, etc., can solve the problems of easy false detection and missed detection peaks and valleys, continuous wave peaks, poor anti-interference ability, etc., and achieves increased clinical constraints and high waveform recognition rate. , The effect of strong anti-interference ability

Active Publication Date: 2009-02-11
SHENZHEN MINDRAY BIO MEDICAL ELECTRONICS CO LTD
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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 i

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  • Adaptive threshold waveform peak valley identification method and device
  • Adaptive threshold waveform peak valley identification method and device
  • Adaptive threshold waveform peak valley identification method and device

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Embodiment Construction

[0044] The features and advantages of the present invention will be described in detail with reference to the accompanying drawings.

[0045] The core content of the present invention is: first identify the possible peaks and valleys in the waveform (such as invasive pressure and blood pressure waveform) through multi-level amplitude thresholds, which are called threshold peaks and valleys, and then combine the identified peaks and valleys historical data from Comprehensively judge the peaks and valleys to be selected in terms of amplitude and period, and select the effective peaks and valleys. The specific steps are as follows: figure 1 Shown:

[0046] The first step is multi-level amplitude threshold detection. Different people or the same person have different pulse wave amplitudes in different states. When the waveform amplitude is high, the small wave peak may be an interference signal, and there is a possibility of false detection; when the waveform amplitude is small, ...

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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 increased clinical 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 ...

Claims

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Application Information

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IPC IPC(8): A61B5/0215
Inventor 邓云张利张四兵
Owner SHENZHEN MINDRAY BIO MEDICAL ELECTRONICS CO LTD
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