Design of a non-invasive blood pressure simulator based on oscillographic method

Abstract

In this article, a non-invasive blood pressure simulation system based on the oscillographic method is proposed, and a piston-connecting rod-type variable air chamber is designed and installed in the system as the pulse waveform generation mechanism. It uses PWM constant current control and ultra-small subdivision technology to control the linear stepping motor to achieve stable and accurate displacement and to reproduce the pulse wave according to the blood pressure envelope, to simulate ambulatory blood pressure. In this article, a hardware circuit design scheme is also put forward, including a power supply circuit, pressure acquisition feedback circuit, stepping motor drive circuit, and so on. The experimental results show that the simulator can meet the requirements of JJF 1626-2017 Calibration Specification for NIBP Simulators and can be used as a calibration standard with efficiency and accuracy.