pH electrode
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United States of America Patent
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Oct 11, 1994
Grant Date -
N/A
app pub date -
Oct 13, 1992
filing date -
Jan 10, 1991
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A pH electrode suitable for in vivo use is provided in a cannula 10, and comprises a reference electrode 14 consisting of a chloridized silver wire surrounded by a solid unbuffered internal reference material 16 comprising potassium chloride, silver chloride, citric acid and sorbitol as a hygroscopic agent. The material 16 is surrounded by a PVC sleeve 12. The tip of the cannula 10 has a pH sensitive polymer-based membrane 20 across its end. The reference material has a pH when hydrated of about 2 which is below the range of pH response of the membrane 20.
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