Telemetric ion selective electrodes

H. Lynn Kim; Marc J. Madou; John W. Hines

doi:10.1117/12.188832

4 October 1994 Telemetric ion selective electrodes

H. Lynn Kim, Marc J. Madou, John W. Hines

Proceedings Volume 2270, NASA/SPIE Conference on Spin-Off Technologies from NASA for Commercial Sensors and Scientific Applications; (1994) https://doi.org/10.1117/12.188832
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

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.

Citation Download Citation

H. Lynn Kim, Marc J. Madou, and John W. Hines "Telemetric ion selective electrodes", Proc. SPIE 2270, NASA/SPIE Conference on Spin-Off Technologies from NASA for Commercial Sensors and Scientific Applications, (4 October 1994); https://doi.org/10.1117/12.188832

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