무선충전이 가능한 인체삽입형 센서 개발: 전자회로부
Development of an implant sensor capable of wireless charging: Electric circuit part
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4차산업혁명이 가속화되고, 의료혜택 취약환경인 원양어선이나 도서지역에서 생활하는 사람들의 원격의료에대한 수요가 높아짐에 따라 인체삽입형 장치에 대한 연구가 관심을 끌고 있다. 본 논문은 인체의 피하지방에 삽입하여 심전계 (Electrocardiogram; ECG) 신호를 모니터링하기 위한 인체삽입형 장치 (Implatnable Medical Device; IMD)의개발방안 및 성능평가를 전자회로 측면에서 살펴보도록 한다. ECG 시뮬레이터를 이용하여 ECG 센서의 정상동작 여부를 확인하고, ECG 센서를 비롯한 SoB (System-on-a-board)는 활성모드에서 18.82 mW의 저전력을 소모한다. 인체삽입형 장치를 돼지고기나 인체모사물질인 팬텀에 넣은 경우 베이스스테이션과 2.4 ~ 2.5 m의 최대 통신도달 거리를기록하였다. 본 개발에서는 인체삽입형 장치에 전원을 공급하기 위하여 리드선이나 1차전지가 아닌 무선으로 전력을공급하여 2차전지를 충전시키는 구조를 적용하였다. 이러한 무선전력전송 효율은 정류기 효율까지 고려하여 약 30% 로 측정되었다.
Abstract
With the arrival of the 4th Industrial Revolution, demands for telemedicine for people living in remote health-care service areas (e.g., an island or an ocean-going vessel) are increasing. Consequently, research on implantable medical devices has gained attention. This paper discusses the development and performance evaluation of implantable medical devices (IMD) in terms of their electronic circuits. An IMD is inserted into the subcutaneous fat of a human body to monitor electrocardiogram (ECG) signals. We checked the normal operation of an ECG sensor using a simulator, confirming that the system-on-a-board, including the ECG sensor, consumes 18.82 mW (low power) in active mode. When the IMD is placed in pork or a phantom, its communication with the base-station is recorded at a maximum distance of 2.5 m. To supply power to the IMD, we adopt a secondary cell, capable of being charged via a non-wired and non-battery wireless power. The efficiency of wireless power transmission is about 30 %, including the rectifier.
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