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A Subcubic Millimeter Wireless Implantable Intraocular Pressure Monitor Microsystem.
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- Author(s): Bhamra H; Tsai JW; Huang YW; Yuan Q; Shah JV; Irazoqui P
- Source:
IEEE transactions on biomedical circuits and systems [IEEE Trans Biomed Circuits Syst] 2017 Dec; Vol. 11 (6), pp. 1204-1215.
- Publication Type:
Journal Article; Research Support, Non-U.S. Gov't
- Language:
English
- Additional Information
- Source:
Publisher: IEEE Country of Publication: United States NLM ID: 101312520 Publication Model: Print Cited Medium: Internet ISSN: 1940-9990 (Electronic) Linking ISSN: 19324545 NLM ISO Abbreviation: IEEE Trans Biomed Circuits Syst Subsets: MEDLINE
- Publication Information:
Original Publication: New York, NY : IEEE, c2007-
- Subject Terms:
- Abstract:
We present a sub-mm 3 , fully wireless, implantable intraocular pressure monitor microsystem (IMM) that comprises a powering coil, an antenna, a piezoresistive micro-electro-mechanical system pressure sensor, and a pressure sensing IC. The system provides a 24-h intraocular pressure monitoring, which is not possible with currently used tonometric measurements. The IMM volume is limited to 0.38 mm 3 (4 × smaller than previous state-of-the-art) for the studies on laboratory rodents prior to human use. A cavity resonator magnetic coupling delivers the wireless power to the chip with 4.89% efficiency. The chip senses a change in a differential sensor resistance by providing a low-power differential resistance to frequency conversion with the measured standard deviation in differential resistance sensing of . The data packets are wirelessly transmitted by an ultralow power 2.4-GHz ISM band OOK transmitter. The IMM is integrated on a 5-μm-thick biocompatible Parylene C substrate. Implemented in a 0.18-μm CMOS process, the system achieves 0.67-mmHg pressure sensitivity with differential resistance sensing and dissipates only 6.3 nW with 30 min of measurement intervals. We verify the IMM functionality in the in vivo biological experiment.
- Publication Date:
Date Created: 20180103 Date Completed: 20181119 Latest Revision: 20181119
- Publication Date:
20231215
- Accession Number:
10.1109/TBCAS.2017.2755596
- Accession Number:
29293418
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