Method of making an electrochemical sensing cell
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United States of America Patent
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-
Aug 13, 1985
Issued Date -
N/A
app pub date -
Mar 9, 1984
filing date -
Mar 10, 1980
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An in vivo electrochemical monitoring device is formed by a catheter-like member which terminates in a closed end having a wall with a fixed opening to admit fluid to be tested, such as blood in an artery. An electrochemical sensor, such as an ISFET device for monitoring the concentration of a particular ion in blood, is mounted inside the tube at a fixed location below the opening preferably a larger sensing chamber. An infusion channel in the tube is arranged to flood the sensor with a fluid of known chemical properties so that the sensor output can be calibrated. Under pressure the calibration fluid expels the test fluid out of the tube or chamber via the fixed opening. A method of constructing a suitable chamber on an ISFET wafer is also disclosed.
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