| Summary: | 碩士 === 中原大學 === 生物醫學工程研究所 === 101 === In clinical, invasive blood pressure measurement is a highly accurate method, but it can’t be used in home-care. The non-invasive blood pressure measurement can be used in home-care and routine examination. However, the measurement device is too large to be easily carry around because of the air pump and the cuff. Additionally, user is uncomfortable during measurement due to the high air pressure generated by the air pump. For these reasons, this study purposes to upgrade the previously constructed cuff-less blood pressure measurement device to improve its accuracy, and design a watchstrap type cuff-less blood pressure measurement device. The proposed system uses a micro-controller, C8051F321, to process signal, calculate parameters and control peripheral devices. The system includes blood pressure measurement hardware and peripheral display devices. In signal processing, the blood pressure signal is acquired by three continuous measurements. The characteristic values are obtained searched from the signal and then sorted. Then, the systolic and diastolic pressures are calculated using polynomial fitting.
In this study, blood pressure readings were obtained from 11 young volunteers using the proposed system, using Matlab and using electric sphygmomanometer (WatchBP office AFIB, microlife). The t-test results indicate that systolic and diastolic pressures obtain from the proposed system and from electric sphygmomanometer were significant difference (P<0.05). There is no significant difference (P>0.05) between the propose system and the Matlab in systolic pressures. However, there is significant difference (P<0.05) in diastolic pressures.
This study purposes to construct a watchstrap type of the cuff-less blood pressure measurement device that it’s easy carry and it doesn’t cause uncomfortable during measurement. It’s found that we can increase the accuracy by obtaining the characteristic values more accurately and then we provide a reliable blood pressure measurement in practical application.
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