Apparatus for the electrochemical determination of the partial oxygen pressure in a liquid measuring medium
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United States of America Patent
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Jul 6, 1993
Grant Date -
N/A
app pub date -
Jul 10, 1991
filing date -
Jul 11, 1990
priority date (Note) -
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Abstract
An apparatus for electrochemically determining the partial oxygen pressure pO.sub.2 in a liquid measuring medium includes a measuring sensor having a working electrode and a counter-electrode. The electrodes are manufactured in thin-film technology and are arranged on a substrate in a measuring channel, to which the measuring medium and a rinse medium can be supplied in alternation. The measuring channel connects a device which controls the flow rate of the measuring medium to a lumen of a double lumen catheter. The rinse medium is suppliable to a second lumen of the double lumen catheter with reversible flow direction. Both lumens have a common orifice which can be introduced into the measuring medium. So-called poisoning of the electrodes in this arrangement is suppressed because the electrodes are flooded in alternation by the measuring medium in a measuring phase and by the rinse medium in a regeneration phase.
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