Polarographic-amperometric three-electrode sensor
First Claim
1. A potentistatically operable, polarographic-amperometric three-electrode sensor for biomedical use comprising a working electrode and a reference electrode covered with a hydrophilic layer impregnated for electrolyte reception, a hydrophobic membrane covering said hydrophilic layer, a gas permeable membrane covering the hydrophobic membrane, said gas permeable membrane being permeable to electrolyte but impermeable to proteins, a plurality of holes provided through the said hydrophobic membrane, said holes communicating with said hydrophilic layer to thereby provide passage for activating electrolyte from the surface of the sensor to the hydrophilic layer and an external counter electrode at least partially surrounding the sensor.
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Abstract
For a potentiostatically operable, polarographic-amperometric sensor, in particular for biomedical use, wherein a working electrode (5) and a reference electrode (4) are covered by an electrolyte layer (9) which is separated from the medium to be measured by a semipermeable membrane (8), the invention proposes to provide the counter electrode (6) in the form of an external electrode which--for example--can be an outer metal coating surrounding the sensor chip (2) in a three electrode system fabricated as micro-sensor with the integrated technique, and which can be made--for example--of a stainless steel material or of a conductive plastics material.
524 Citations
8 Claims
- 1. A potentistatically operable, polarographic-amperometric three-electrode sensor for biomedical use comprising a working electrode and a reference electrode covered with a hydrophilic layer impregnated for electrolyte reception, a hydrophobic membrane covering said hydrophilic layer, a gas permeable membrane covering the hydrophobic membrane, said gas permeable membrane being permeable to electrolyte but impermeable to proteins, a plurality of holes provided through the said hydrophobic membrane, said holes communicating with said hydrophilic layer to thereby provide passage for activating electrolyte from the surface of the sensor to the hydrophilic layer and an external counter electrode at least partially surrounding the sensor.
Specification