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Implantable parylene-based wireless intraocular pressure sensor

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5 Author(s)
Po-Jui Chen ; California Inst. of Technol., Pasadena ; Rodger, D.C. ; Saati, S. ; Humayun, M.S.
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This paper presents a novel implantable, wireless, passive pressure sensor for ophthalmic applications. Two sensor designs incorporating surface-micromachined variable capacitor and variable capacitor/inductor are implemented to realize the pressure sensitive components. The sensor is monolithically microfabricated using parylene as a biocompatible structural material in a suitable form factor for increased ease of intraocular implantation. Pressure responses of the microsensor are characterized on-chip to demonstrate its high pressure sensitivity (> 7000 ppm/mmHg) with mmHg level resolution. An in vivo animal study verifies the biostability of the sensor implant in the intraocular environment after more than 150 days. This sensor will ultimately be implanted at the pars plana or iris of the eye to fulfill continuous intraocular pressure (IOP) monitoring in glaucoma patients.

Published in:

Micro Electro Mechanical Systems, 2008. MEMS 2008. IEEE 21st International Conference on

Date of Conference:

13-17 Jan. 2008