Electrode device
First Claim
1. An electrode device for determining the partial pressure of CO2 and comprising an electrode housing, a CO2 -permeable membrane, a pH-sensitive measuring electrode arranged behind the membrane and having a measuring area which is in contact with a bicarbonate-containing exterior electrolyte which is present between the measuring area and the membrane and having an interior electrolyte and an interior reference electrode, and an exterior reference electrode in contact with the exterior electrolyte, the interior electrolyte being so adapted to the exterior electrolyte that the potential difference measured over the exterior reference electrode and the interior reference electrode at in vivo CO2 partial pressure is substantially temperature-independent with a temperature dependence corresponding to a temperature dependence for the CO2 partial pressure determination in the range -1%/°
- C.-+1%/°
C.
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Accused Products
Abstract
An electrode device for the determination of the partial pressure of CO2, Pco2, in particular an electrode device for transcutaneous determination of Pco2.
The interior electrolyte of the electrode device is adapted to the exterior electrolyte in such a manner that the potential difference measured over the exterior reference electrode and the interior reference electrode is substantially temperature-independent with a temperature dependence for the CO2 partial pressure determination in the range of -1%/°C.-+1%°C.
The interior electrolyte preferably contains a pH-buffer system based on phenyl phosphonic acid.
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Citations
14 Claims
- 1. An electrode device for determining the partial pressure of CO2 and comprising an electrode housing, a CO2 -permeable membrane, a pH-sensitive measuring electrode arranged behind the membrane and having a measuring area which is in contact with a bicarbonate-containing exterior electrolyte which is present between the measuring area and the membrane and having an interior electrolyte and an interior reference electrode, and an exterior reference electrode in contact with the exterior electrolyte, the interior electrolyte being so adapted to the exterior electrolyte that the potential difference measured over the exterior reference electrode and the interior reference electrode at in vivo CO2 partial pressure is substantially temperature-independent with a temperature dependence corresponding to a temperature dependence for the CO2 partial pressure determination in the range -1%/°
Specification