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Proceedings Paper

Telemetric ion selective electrodes
Author(s): H. Lynn Kim; Marc J. Madou; John W. Hines
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Paper Abstract

A dual lumen catheter (1.19 mm O.D.) was used as the basis for an in-vivo ion selective electrode with telemetric readout. The two lumens were used respectively as working and reference chambers. The reference chamber has a hole contacting the external medium, and the working electrode chamber has a hole contacting the ion selective membrane. The internal electrolytes for both chambers were gelled, and their compositions were optimized for extended lifetime and stability. The catheter has been interfaced to a 450 kHz amplitude- modulated implantable telemetry transmitter which incorporates a high impedance (> 1012 ohm) preamplifier and allows for nearly continuous measurement of pH and temperature. To avoid both probe contamination and blood clotting, we are currently implementing a self-cleaning membrane system. The results shown will pertain to a pH in-vivo probe.

Paper Details

Date Published: 4 October 1994
PDF: 6 pages
Proc. SPIE 2270, NASA/SPIE Conference on Spin-Off Technologies from NASA for Commercial Sensors and Scientific Applications, (4 October 1994); doi: 10.1117/12.188832
Show Author Affiliations
H. Lynn Kim, NASA Ames Research Ctr. (United States)
Marc J. Madou, Microfabrications (United States)
John W. Hines, NASA Ames Research Ctr. (United States)


Published in SPIE Proceedings Vol. 2270:
NASA/SPIE Conference on Spin-Off Technologies from NASA for Commercial Sensors and Scientific Applications
Nona K. Minnifield, Editor(s)

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