Development of a piezoresistive real-time blood pressure sensor
Date Issued
2016
Date
2016
Author(s)
Chen, Wei-Jie
Abstract
The objective of this thesis is to develop a blood-pressure measuring method for providing a real-time monitoring and early warning of cardiovascular diseases. The major disadvantages of the commonly-used sphygmomanometers found on the market are bulky and heavy for outdoor applications. In this thesis, we develop a wearable, blood-pressure measuring device with a light weight and small volume. In this thesis, the proposed noninvasive measuring technique is based on detecting surface deformations of human skins and then calculating the blood pressures. With the assumption of no external forces on the skin surface, the deformation was primarily caused by the fluctuations of the pressure waves in the deeply-embedded arteries surrounded by human tissues. We proposed a simplified mechanical model to convert the surface-skin deformations measured by the strain gauge into the blood pressures of arteries. For experimental validations, we constructed the artificial human structure composed of the pump and the hollow PDMS tube to analogize the case that a heart pumps out blood pressure waves flowing in arteries. It was demonstrated that the pressure waves in the channel of the PDMS tube could be detected and recorded by the strain gauge attached on the surface of the artificial structure.Then, we developed a prototype for vitro tests with real humans. The experimental results shown that real human blood pressures could be measured with our proposed device with a good accuracy. In the future, the proposed device can be improved by integrating a wireless communication and a microprocessor for portable capabilities.
Subjects
Blood pressure
Skin
Wearable device
Strain gauge
vitro test
SDGs
Type
thesis
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