A Piezoelectric Heart Sound Sensor for Wearable Healthcare Monitoring Devices
Heart disease is the leading cause of death all around the world. And heart sound monitoring is a commonly used diagnostic method. This method can obtain vital physiological and pathological evidence about health. Many existing techniques are not suitable for long-term dynamic heart sound monitoring since their large size, high-cost and uncomfortable to wear. This paper proposes a small, low-cost and wearable piezoelectric heart sound sensor, which is suitable for long-term dynamic monitoring and provides technical support for preliminary diagnosis of heart disease. First, the theoretical analysis and finite element method (FEM) simulation have been carried out to determine the optimum structure size of piezoelectric sensor. Subsequently, the sensor is embedded into the fabric-based chest strap to verify the detection performance in wearable scenarios. An existing piezoelectric sensor (TSD108) is used as reference. The designed sensor can acquire complete heart sound signals, and its signal-to-noise ratio is 2 dB higher than that of TSD108.
KeywordsWearable Heart sound sensor Finite element method Signal-to-noise ratio
This work is supported by National Key Research & Development Plan of China (NO. 2016YFB1001401) and National Natural Science Foundation of China (NO. 61572110).
- 2.Haoran, R., Hailong, J., Chen, C., et al.: A novel cardiac auscultation monitoring system based on wireless sensing for healthcare. IEEE J. Trans. Eng. Health Med. 6, 1 (2018)Google Scholar
- 3.Hu, Y., Xu, Y.: An ultra-sensitive wearable accelerometer for continuous heart and lung sound monitoring. In: 2012 Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). IEEE (2012)Google Scholar
- 4.Chen, T., Xing, S., Guo, P., et al.: The design of a new digital collecting system of heart sound signals based on XH-6 sensor. In: International Conference on Measuring Technology & Mechatronics Automation. IEEE Computer Society (2010)Google Scholar
- 5.Ou, D., Ouyang, L., Tan, Z., et al.: An electronic stethoscope for heart diseases based on micro-electro-mechanical-system microphone. In: IEEE International Conference on Industrial Informatics. IEEE (2017)Google Scholar
- 7.Malik, B., Eya, N., Migdadi, H., et al.: Design and development of an electronic stethoscope. In: Internet Technologies & Applications. IEEE (2017)Google Scholar
- 8.Grundlehner, B., Buxi, D.: Methods to characterize sensors for capturing body sounds. In: International Conference on Body Sensor Networks. IEEE Computer Society (2011)Google Scholar
- 9.Popov, B., Sierra, G., Telfort, V., et al.: Estimation of respiratory rate and heart rate during treadmill tests using acoustic sensor. In: International Conference of the Engineering in Medicine & Biology Society. IEEE (2005)Google Scholar
- 10.Surtel, W., Maciejewski, M., Maciejewska, B.: Processing of simultaneous biomedical signal data in circulatory system conditions diagnosis using mobile sensors during patient activity (2014)Google Scholar
- 13.Jiang, D.-Y., Zheng, Z.-Y., Li, L.: The analyses of the vibration model of piezoelectric ceramic piece based on ANSYS. J. Trans. Technol. 12(4), 9–16 (2003)Google Scholar
- 14.Fan, X., Ma, S., Zhang, X., et al.: Simulation analysis of piezoelectric ceramic chip PZT based on ANSYS. Piezoelectrics Acoustooptics 36(3), 416–420 (2014)Google Scholar
- 15.Xu, P., Tao, X., Wang, S.: Measurement of wearable electrode and skin mechanical interaction using displacement and pressure sensors (2011)Google Scholar
- 17.BIOPAC. https://www.biopac.com/product/contact-microphone/. Accessed 5 May 2019