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Wireless Implantable Intraocular Pressure Sensor with Parylene-Oil-Encapsulation and Forward-Angled RF Coil

Shapero, Aubrey and Agarwal, Abhinav and Martinez, Juan Carlos and Emami, Azita and Humayun, Mark S. and Tai, Yu-Chong (2019) Wireless Implantable Intraocular Pressure Sensor with Parylene-Oil-Encapsulation and Forward-Angled RF Coil. In: 2019 IEEE 32nd International Conference on Micro Electro Mechanical Systems (MEMS). IEEE , Piscataway, NJ, pp. 21-24. ISBN 9781728116105. https://resolver.caltech.edu/CaltechAUTHORS:20191025-124827181

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Abstract

This paper presents a wireless and implantable intraocular pressure (IOP) sensor with parylene-oil-encapsulation packaging using a novel folded PCB architecture accomplishing practical RF coupling for power and data in a rabbit. The sensor is operated with an air gap of 5 mm between the primary coil and the animal, coupling to an on-chip coil at an input power of 32 dBm at 915 MHz, and can also be operated when the eyelid covers the sensor. Additionally, two novel results for parylene-on-oil deposition in general are presented. First, we show that the thickness of the porous layer of parylene-C (PA-C) and parylene-HT (PA-HT) deposited on silicone oils have a logarithmic decrease in porous layer thickness (PLT) versus silicone oil molecular weight (MW) over a range of 2–139 kDa. Second, we directly verify that parylene-oil-encapsulated pressure sensors retain sensitivity despite material buildup for the first time.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1109/memsys.2019.8870787DOIArticle
ORCID:
AuthorORCID
Emami, Azita0000-0003-2608-9691
Humayun, Mark S.0000-0002-5830-5208
Tai, Yu-Chong0000-0001-8529-106X
Additional Information:© 2019 IEEE. The authors thank Trevor Roper for maintaining the Caltech Micromachining Laboratory, Maya Ordoñez for help with parylene thickness measurements, and Shane Shahrestani for assistance during the rabbit experiment. We thank the Rosen Bioengineering Center, the Heritage Medical Research Institute, and the L. K. Whittier Foundation for financial support.
Group:Heritage Medical Research Institute, Rosen Bioengineering Center
Funders:
Funding AgencyGrant Number
Donna and Benjamin M. Rosen Bioengineering CenterUNSPECIFIED
Heritage Medical Research InstituteUNSPECIFIED
L. K. Whittier FoundationUNSPECIFIED
Subject Keywords:Packaging, Parylene, Parylene-oil-encapsulation, Parylene-on-oil, Implantable intraocular pressure sensor, RF backscattering, On-chip coil
Record Number:CaltechAUTHORS:20191025-124827181
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20191025-124827181
Official Citation:A. Shapero, A. Agarwal, J. C. Martinez, A. Emami, M. S. Humayun and Y. Tai, "Wireless Implantable Intraocular Pressure Sensor with Parylene-Oil-Encapsulation and Forward-Angled RF Coil," 2019 IEEE 32nd International Conference on Micro Electro Mechanical Systems (MEMS), Seoul, Korea (South), 2019, pp. 21-24. doi: 10.1109/MEMSYS.2019.8870787
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:99452
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:25 Oct 2019 20:20
Last Modified:25 Oct 2019 20:20

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