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4 October 1994 Telemetric ion selective electrodes
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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.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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);

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