Wireless Pulse Wave Detection System Based On PVDF Film

Human pulse wave can reflect rich human physiological and pathological information, which has been paid attention by Chinese and foreign medical workers since ancient times. Pulse wave is generated from the periodic pulsation of heart, propagate along the path of the blood flow. The pulse wave is affected by the environment of the vascular and blood system, so we can extract the cardiovascular system of the physiological parameter information from the pulse wave waveform, and assess the health of the human body.With the progress of science and technology, the method of obtaining pulse wave has been improved a lot, which means that not only the achievement of the quantitative acquisition of pulse wave, but also the reduction of errors appeared in artificially diagnosis. In all kind of pulse wave sensors, the pulse wave sensors which is made of polyvinylidene difluoride(PVDF) have a good performance in flexibility and sensitivity, which is important in detecting the pulse wave non-invasively.Nowadays, the most of pulse wave sensors and pulse wave detection systems that have been put into use are using rigid materials and wired connection, which adversely affect the user's experience both in static and motion state. In order to resolve the problems, this paper design a wireless pulse wave detection system based on PVDF, which is composed of the signal processing circuit, MCU module and Bluetooth module. The system can precisely detect the arterial pulse wave and send it to computer wirelessly. The computer display interface is programmed in Labview to communicate with MCU and display the waveform. In addition, the paper discusses the impaction on pulse wave in different stress put on sensors, and the results are in agreement with the model predictions. Furthermore, the paper investigates the influences of different filtering methods on the arterial pulse wave, and find that the wavelet filtering gets the best effect. Finally, we design the experiment to record the human arterial pulse wave in motion state, and analyze the results.