標題: A capacitor-based sensor and a contact lens sensing system for intraocular pressure monitoring
作者: Chiou, Jin-Chern
Huang, Yu-Chieh
Yeh, Guan-Ting
電機資訊學士班
電控工程研究所
Undergraduate Honors Program of Electrical Engineering and Computer Science
Institute of Electrical and Control Engineering
關鍵字: intraocular pressure (IOP);IOP sensor;capacitor-based;contact lens;microelectromechanical system (MEMS)
公開日期: 1-一月-2016
摘要: This study proposes a capacitor-based sensor on a soft contact lens for the measurement of intraocular pressure (IOP). The sensor was designed and fabricated via microelectromechanical system fabrication technologies. The soft contact lens is designed to be worn on a cornea such that the curvature of the contact lens corresponds substantially to that of the cornea. In addition, the contact lens was fabricated via a cast-molding method using poly-2-hydroxyethyl methacrylate to achieve a lens with high oxygen permeability, which can be worn comfortably for a long time. An IOP sensor prototype was implemented, which exhibited 1.2239 pF mmHg(-1) (13,171 ppm mmHg(-1)) sensitivity during measurements of an artificial anterior chamber at pressures between 18 and 30 mmHg. The results indicate that the developed capacitor-based IOP sensor exhibited high stability and reproducibility in a series of measurements performed under various pressures. The capacitance of the proposed IOP sensor can successfully be converted into a digital value via a capacitor-to-digital converter and be transmitted via a commercial wireless telemetry system in this study.
URI: http://dx.doi.org/10.1088/0960-1317/26/1/015001
http://hdl.handle.net/11536/129518
ISSN: 0960-1317
DOI: 10.1088/0960-1317/26/1/015001
期刊: JOURNAL OF MICROMECHANICS AND MICROENGINEERING
Volume: 26
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