Characterization of Implantable, Wireless Capacitive Type Intraocular Pressure Sensor
- Characterization of Implantable, Wireless Capacitive Type Intraocular Pressure Sensor
- 장철인; 신경식; 이미림; 박창근; 윤광석; 강지윤; 이수현
- 안압센서; 무선측정; 캐패시터; 인체삽입; IOP sensor; Capacitive sensor; Implantable
- Issue Date
- 16th The Korean MEMS Conference
- We had presented an inductive type intraocular pressure sensor (i-IOP) in previous work. The distance between a micro coil and a ferrite on the membrane was modulated by pressure, and as a result the inductance and resonance frequency was changed. However, it has some obstacles in increasing the sensitivity in sensor performance and in reducing the size to improve biocompatibility. Therefore, this study suggests a capacitive type IOP (c-IOP). The sensitivity of a c-IOP was 24 kHz/mmHg under 60 mmHg pressure. It is larger than 14 kHz/mmHg of an i-IOP, although the size of c-IOP is smaller than that of i-IOP by at least 47 % without significantly degradation of phase-dip in received signal from external coil. The performance of both sensors will be tested with in-vivo test with rabbits as real time pressure sensors.
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