G - Physics – 01 – N
Patent
G - Physics
01
N
324/23
G01N 27/30 (2006.01) G01N 27/40 (2006.01) G01N 27/49 (2006.01) G01N 33/487 (2006.01)
Patent
CA 1202367
ABSTRACT An electro-chemical cell for determining a particular property or component of a fluid obtains the necessary electro- lyte for activating the cell from the fluid itself. The elec- trodes are covered with a layer of a hydrophylic polymer which allows the electrolyte to pass, but prevents larger molecules such as proteins to reach the cathode. The hydrophylic polymer layer is covered by a selectively permeable membrane which is permeable for the component of the fluid which has to be measured, for instance oxygen or carbon dioxide. It is impermeable for the electrolyte. For allowing the electrolyte to enter the hydrophy- lic polymer layer holes are provided in said membrane and are located apart from the cathode in such a way that the amount of oxygen or carbon dioxide directly entering the hydrophylic poly- mer layer through said holes is negligible compared with the amount of oxygen or carbon dioxide reaching the cathode by dif- fusion through the membrane and the hydrophylic polymer layer.
435951
Honeywell Medical Electronics B.v.
Smart & Biggar
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