便携式慢呼吸训练降压仪的设计

Design of portable blood pressure depressor based on slow breathing training

临床研究证实缓慢呼吸具有显著降低血压的疗效。本文基于此原理设计了一种便携式慢呼吸训练降压仪。降压仪采用微型变极距电容传感器采集呼吸信号,以STM32为主控芯片,用WT588D语音芯片实现语音、音乐引导慢呼吸训练,并在3.5寸彩屏上实现呼吸状态指引。针对患者难以适应慢呼吸训练的问题,提出了基于反馈调节的智能引导呼吸算法来训练患者慢呼吸。10名高血压患者使用本仪器进行了累计100次慢呼吸训练,结果表明:随着训练次数增加,患者呼吸率从(15.16±0.92)次/分降低到(9.40±0.29)次/分,同时呼吸率低于8次/分的时间占总治疗时间的比例也从0.079±0.017升高到0.392±0.019。因此,本研究设计的降压仪能有效引导高血压患者进行慢呼吸训练。

Clinical studies had demonstrated that slow breathing could lower blood pressure significantly. Based on this knowledge, a portable blood pressure depressor was designed in this study. The device used a miniature variable distance capacitive sensor to collect respiratory signal, an STM32 as the main control chip, a WT588D voice chip to generate voice and music and guide slow breathing, and a 3.5-inch color screen to display breathing state and provide guidance. For patients with difficulty in adapting themselves to the slow breathing training, an intelligent guiding breathing algorithm based on feedback regulation mechanism was proposed to train patients to breathe slowly. Ten volunteers with hypertension were recruited and then trained to breathe slowly, accumulating up to 100 times using this device. The results showed that breath rate of the volunteers decreased from 15.16＋_0.92 times per minute to 9.40＋_0.29 times per minute, and meanwhile, time length of breath rate less than 8 times per minute in the proportion of total treatment time increased from 0.079±0.017 to 0.392±0.019 as the training times increased. In a conclusion, the proposed blood pressure depressor worked effectively in guiding slow breathing training.