Photoplethysmography based noninvasive continuous blood pressure measurement method

Abstract

The invention relates to the technical field of blood pressure measurement, in particular to a photoplethysmography based noninvasive continuous blood pressure measurement method. The method comprises the following steps that 1, a volume pulse wave of a measuring object is collected, and a digital volume pulse wave is obtained; 2, the maximum amplitude Hp, minimum amplitude Ht and cardiac cycle T of the digital volume pulse wave are extracted, and then the pulse waveform area Aarea and pulse wave average amplitude Have of the digital volume pulse wave in one cardiac cycle T are obtained; 3, a second-order differential volume pulse wave is obtained, a first rise fulcrum P1 and a second rise fulcrum P2 in one cardiac cycle T of the second-order differential volume pulse wave are extracted, and then pulse wave translation time PWTT is obtained, wherein the pulse wave translation time is a time difference of the first rise fulcrum P1 and the second rise fulcrum P2; 4, a pulse-pressure difference DP is obtained; 5, systolic blood pressure SBP is obtained; 6, diastolic blood pressure is obtained. Accordingly, the measurement precision is high, and measurement is easy and convenient.

Description

technical field [0001] The invention relates to the technical field of blood pressure measurement, in particular to a noninvasive continuous blood pressure measurement method based on photoplethysmography. Background technique [0002] Blood pressure (Blood Pressure, BP) is an important physiological health indicator of the human body, which can provide important parameter basis for the diagnosis and treatment of cardiovascular diseases. [0003] Existing blood pressure measurement can be divided into two categories: invasive blood pressure measurement and non-invasive blood pressure measurement. In invasive blood pressure measurement, the catheter of the pressure sensor needs to be inserted into the aorta or heart of the measurement object to detect the blood pressure signal. The measurement result is accurate, but preparation Long time, high requirements on the subjects and easy to cause complications; non-invasive blood pressure measurement generally obtains blood pressur...

AI Technical Summary

Problems solved by technology

These two methods can be collectively classified as a two-point measurement method. The measurement process involves multiple parts of the human body, the measurement operation is complicated, and it is easy to be affected by the measurement position and cause errors.

In addition, the pulse wave transit time has a linear relationship with the systolic blood pressure of the human body, and the linear correlation with the diastolic blood pressure of the human body is not good, so the diastolic blood pressure of the human body cannot be measured well by the pulse wave transit time

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