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Measuring method and device for measuring systole time parameter

A technology of time parameters and heart contraction, applied in diagnostic recording/measurement, medical science, sensors, etc., can solve the problems of high operation difficulty, high cost, unsatisfactory signal stability and repeatability, etc. The effect of small equipment investment and low equipment cost

Active Publication Date: 2014-10-01
CHENGDU KANGTUOBANG TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the above-mentioned prior art, the invasive measurement needs to be operated by professional medical personnel, which is expensive and will cause severe pain to the person being measured; the non-invasive measurement has complex equipment, high difficulty in operation, signal stability and repeatability. The performance is not ideal, it is not convenient for continuous measurement, and the actual service life is not ideal, etc.

Method used

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  • Measuring method and device for measuring systole time parameter
  • Measuring method and device for measuring systole time parameter
  • Measuring method and device for measuring systole time parameter

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Embodiment 1

[0031] Such as Figure 1 to Figure 4 As shown, the present application provides a measurement method for measuring the systolic time parameter, which is used to measure the time LVET and the parameters derived therefrom when the blood enters the aorta through the open aortic valve when the left ventricle contracts, including the following steps :

[0032] a) using photoplethysmography to collect photoplethysmography signals from peripheral tissues of the human body;

[0033] b) Use the peak search algorithm to automatically detect the characteristic reference points on the photoplethysmography signal in each cardiac cycle obtained in the previous step, including: the first reference point (starting point of the rising edge), the second reference point (systolic period peak point), the third reference point (diastolic peak point);

[0034] c) Search for the fourth reference point (falling edge inflection point) on the first-order derivative curve of the pulse wave;

[0035]d...

Embodiment 2

[0050] The present embodiment is further limited on the basis of embodiment 1, as figure 1 As shown, the implementation step of step c) is: from the moment corresponding to the third reference point, search backward on the first-order derivative curve, before reaching the second reference point, once the curve value is searched at a certain time by positive becomes negative, the search stops, and the corresponding point on the original waveform at this moment is the fourth reference point; In the sub-interval between the reference points, the moment at which the absolute value of the first derivative is the smallest is considered as the moment corresponding to the fourth reference point. The above steps provide a specific method for realizing step c). The fourth reference point obtained according to this method is accurate at all times, and the deviation of all the results obtained within the measurement period is small, that is, the values ​​are repeatable. At the same time, ...

Embodiment 3

[0054] The present embodiment is further limited on the basis of embodiment 1, as Figure 4 As shown, an analog-to-digital converter is also arranged between the signal acquisition unit and the information processing unit, the spectrum acquisition range of the signal acquisition unit is 0.05-35hz, and an There is a wave notch filter, which is used to eliminate the 50hz power frequency interference signal. The set analog-to-digital converter is used for subsequent digital processing of the collected signals; the limitation of the frequency spectrum acquisition range of the signal acquisition unit aims to reduce the data acquisition amount of the signal acquisition unit as much as possible on the basis of ensuring the acquisition of the required signal frequency band, It is beneficial to reduce the data processing cost of the present invention; the set wave notch filter is used to eliminate the interference produced by the power frequency signal on the measurement accuracy of th...

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Abstract

The invention discloses a measuring method and device for measuring a systole time parameter. The measuring method comprises the steps of acquisition of a pulse oximeter signal, automatic extraction of a characteristic point and digital correction of a characteristic parameter. The device is taken as a hardware carrier of the method. More accurate LVET (Left Ventricular Ejection Time) and measuring results of relevant parameters are obtained on the basis of the pulse oximeter signal by means of a simple measure in order to rapidly obtain clinical diagnostic data related to initial screening of heart disease and cardiac function evaluation. Photoplethysmography equipment for realizing the functions comprises a pulse oximeter signal acquisition unit, a signal processing unit and a data output unit. The entire device is easy to wear, is low in manufacturing cost, and contributes to reduction of the cost on cardiovascular function evaluation and disease monitoring.

Description

technical field [0001] The invention relates to a method and a device for measuring clinical heart function parameters, in particular to a method and a device for measuring heart contraction time parameters. Background technique [0002] Left ventricular ejection time (LVET) is defined as the time elapsed during each cardiac cycle when blood enters the aorta through the open aortic valve as the left ventricle contracts. The results of a large number of clinical experiments show that LVET and its derived parameters have important clinical significance in the early screening of heart diseases and the evaluation of heart function. In the prior art, there are two types of measurement methods for LVET: invasive and non-invasive. Invasive measurement inserts a catheter into the root of the aorta to accurately measure LVET, but it needs to be operated by professional medical personnel, the cost is high, and it will cause severe pain to the person being measured. [0003] In t...

Claims

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Application Information

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IPC IPC(8): A61B5/0295
Inventor 段文锋郑定昌潘帆
Owner CHENGDU KANGTUOBANG TECH CO LTD
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