雙模式藍牙無線數位聽診儀之介面設計

Interface Design of Dual-mode Bluetooth Wireless Digital Stethoscope

徐慶豐(Ching-Feng Hsu)

指導教授 ： 譚旦旭 ； 黃文增

國立臺北科技大學/電資學院/電資碩士在職專班研究所/碩士(2013年)

摘要

傳統類比聽診儀是醫生診斷病徵的基本必備配備之一。因為診斷病徵方便使用與效率的需求，它被數位化、無線化、與病人資料儲存化是改善傳統類比聽診儀的要項。在本研究中，我們實作兩種數位聽診儀，有線與無線數位聽診儀。於有線數位聽診儀模式中，基於傳統類比聽診儀設計架構、我們應用電容式麥克風電路將所偵測的心音訊號傳送到電腦端作數位化儲存。因此，本裝置不但擁有傳統類比聽診儀的特色外，而且改善數位聽診器的聲音尖銳與失真之缺點。本研究的有線聽診儀所量測到的心音訊號和文獻的誤差值只有0.08 mV。於無線數位聽診儀中包含三軸加速器與無線藍牙裝置。我們應用三軸加速器擷取心臟舒張和收縮所發生的心臟震動訊號(Seismocardiography, SCG)，轉換成為心音訊號。其訊號經過放大和濾波電路處理，並搭配低功率微處理器做類比數位轉換後，應用無線藍牙裝置再將心音訊號傳送電腦端。本無線聽診儀系統可應用到遠距監控使用者用作長期監控使用，可自行量測數位化心音訊號。更進一步，本聽診儀系統也可以作預防與監控突發性的心音或心律異常發生裝置使用。本研究的無線聽診系統和文獻量測到的SCG訊號誤差值約4.9 mV(約13%)，因此，從我們實驗結果得知本設計可用性極高。

關鍵字

數位聽診器 ； 心音 ； 心律 ； 心臟震動訊號(SCG) ； 三軸加速器 ； 藍牙

並列摘要

The traditional stethoscope is one of essential equipments for the doctor to diagnose patient's symptoms. For the convenient use and performance reasons to diagnose symptoms, to digitize, getting wireless, and patient's information to be stored are to improve criteria of the traditional stethoscope. Wired and wireless digital stethoscopes are implemented in this study. Based on the structure of the traditional stethoscope design, the condenser microphone circuit is employed here to detect the heart sound signal and then transmit to PC for digitized store reason in the wired digital stethoscopes mode. Therefore, our wired stethoscope not only owns the characteristics of the traditional stethoscope but also improves the disadvantages of the sharpness and distortion of the heart sound. There is about 0.08 mV error of the heart sound between our design and the literal. Our wireless digital stethoscope design includes the 3D accelerator and Bluetooth device. The 3D accelerator is applied here to fetch the seismocardiography (SCG) of the heart diazotization and shrink, and then convert it to the heart sound. This heart sound will be amplified and filtered by their corresponding circuits. After processing by the analogy to digital converter of the lower power consumption processor, the heart sound is transmitted to PC by the wireless Bluetooth device. Our wireless stethoscope system can be applied to long time tele-care users for monitoring oneself heart sound. Moreover, our stethoscope system can also be as one device for preventing and monitoring the heart sound and heart rhythm in the sudden cases. Since the error of the heart sound between our wireless design and the literal is about 4.9 mV (within 13%), usability of our design is extremely high form our experiment results.

並列關鍵字

Digital stethoscope ； Heart sound ； Heart rate ； Seismocardiography(SCG) ； 3D accelerometer ； Bluetooth

參考文獻

[10] 鄧乃睿，心音訊號有效區間之擷取及其於數位聽診系統之應用，碩士論文，國立台北科技大學，台北，2012。

[14] 劉子誠，可攜式智慧型心音聽診系統，碩士論文，國立臺灣大學，台北，2008。

[3] L. A. Geddes, “Birth of the stethoscope,” IEEE Engineering in Medicine and Biology Magazine, Vol. 24, Issue 1, 2005, pp. 84-86.

[4] H. Pasterkamp et al, “Respiratory Sound-Advance Beyond the Stethoscope,” Am. J. Respir. Crit. Care Med., Vol. 156. 1997, pp. 974-987.

[7] L. Grajales and I. Nicolaescu, “Wearable multisensor heart rate monitor,” International Workshop in Wearable and Implantable Body Sensor Networks(BSN 2006), April 2006, pp. 15-157.