Measurement device and method for pulse wave velocity physiological parameters based on photoelectric plethysmography

Abstract

The invention provides a measurement device and a measurement method for pulse wave velocity physiological parameters based on photoelectric plethysmography. The measurement device comprises a first pulse wave collecting channel and a second pulse wave collecting channel which are connected with a pulse wave analog processing device; the pulse wave analog processing device is also connected with a single chip microcomputer through a signal; the single chip microcomputer is electrically connected with a power module and is connected with a handheld terminal through a wireless module by utilizing the signal; the single chip microcomputer is also connected with a pulse wave velocity measurement module in a communication way; the single chip microcomputer is a central control processing unit and internally comprises a clock circuit, a storage, a timer, an A / D (Analog / Digital) converter and an I / O (Input / Output) interface which are controlled to connect through a single chip microcomputer processor; and the delay error can be effectively reduced by adopting the measurement device together with the measurement method.

Description

technical field [0001] The invention belongs to the technical field of measuring pulse wave velocity physiological parameters, and in particular relates to a measuring device and method for pulse wave velocity physiological parameters based on photoelectric volume. Background technique [0002] At present, the pulse wave velocity is a physiological parameter. As the information or processing information of the intermediate results obtained from the human body, it is a very important parameter in the corresponding research field, because the conduction velocity of the pulse wave has a positive correlation with blood pressure. , used in ambulatory blood pressure monitoring can replace the monitoring of blood pressure by measuring the pulse wave. Theoretical research and experimental verification show that the pulse wave velocity (PWV) is related to the elasticity of the blood vessel wall, but the most common electronic sphygmomanometer cannot measure the physiological paramete...

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Problems solved by technology

[0008] 1. Use tangent line intersection to measure pulse wave delay: tangent line method will increase calculation error and reduce measurement accuracy

[0009] 2. Use the lowest point method to measure: Use the cuff to measure PWV. Every time the position of the cuff is different and the tightness of the cuff is different, the measured waveform will be different, resulting in errors in the measurement results.

[0010] 3. Using the peak method to measure: use the photoelectric sensor to collect the pulse wave signal on the index finger of the human body, so that the measurement work is completed on one arm, but the two signals of the collected signal pressure pulse wave and volume pulse wave, due to the principle of data acquisition Different, so the peak point is selected as the reference point, but the peak is easily affected by the reflected wave, resulting in a certain gap between the measured value and the actual value

[0011] 4. Use the point with the maximum slope: take the point with the maximum slope of the pulse wave as the measurement mark point, use the method of differential threshold to find the point with the maximum slope, and use the point with the maximum slope in the rising branch of the pulse wave front as the mark point. The starting point of the foot is easily affected by the diastole of the previous cycle, and it is not easy to extract

[0012] The results measured by the above method, the delay error is too large and very unreliable

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