A non-invasive monitoring device and method for beat-by-beat arterial blood pressure

Abstract

The invention provides a non-invasive monitoring device and method for beat-to-beat arterial blood pressure. The device comprises a cuff, a gas charging and discharging control module, a static pressure control module, a gas discharging control module, a pressure sensor and a signal processing module. The static pressure control module is used for controlling the cuff to be charged with gas to a set value, then constant gas charging is kept without discharging, and the signal processing module is used for processing collected pressure pulse wave signals to determine monitored blood pressure signals. According to the monitoring method, the average mean arterial pressure (MAP) and pulse pressure (PP) of a monitored person are obtained by the signal processing module according to the collected pressure pulse wave signals in the gas discharging process of the gas charging and discharging control module. Filtering and base line removing are performed on the pressure pulse wave signals which are collected under the condition that the static pressure control module performs constant gas charging, then linear amplification is performed on the pressure pulse wave signals through the PP, and base line correction is performed on the pressure pulse wave signals through the MAP. Changes of the beat-to-beat blood pressure can be reflected, and the real pulse waveform characteristics can be reflected.

Description

technical field [0001] The invention relates to a device and method for monitoring blood pressure, which are applied in the technical field of medical vital sign monitoring. Background technique [0002] The current non-invasive and continuous blood pressure monitoring technologies mainly include the cuff pressure wave-based oscillation method and the method of linearly estimating blood pressure using pulse wave velocity (PWTV) (or pulse wave transit time (PWTT)). [0003] When monitoring blood pressure, the oscillation method based on cuff pressure wave first inflates the cuff to a fixed value above the systolic blood pressure to completely block the blood flow in the arm, then gradually releases the cuff pressure to restore the blood flow in the arm, and the pulse wave begins Appear. The electronic sensor collects the data during the inflation and deflation process in real time, that is, the amplitude of the pulse wave at the point where the pulsation of blood flow in the...

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Problems solved by technology

However, the regression coefficient that this method relies on has individual differences, and the regression coefficient of the same individual is only constant in a short period of time; and the measured point of the distal end of the limb needs to be measured by changing the body position to complete the PWTT measurement. The measurement accuracy of body position changes also depends on

[0007] There are the following three problems in the two non-invasive and continuous blood pressure monitoring technologies described above: (1) they cannot meet the requirements of combining the two important physiological signals of pulse wave and blood pressure to carry out cardiovascular function research; (2) the measurement results It is highly dependent on factors such as experimental conditions and body position changes, which affects the accuracy of quantitative monitoring of blood pressure; (3) The pulse waveform obtained by the pulse wave velocity monitoring method cannot reflect the most realistic pulse waveform

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