PARTIAL-PRESSURE MEASURING DEVICE FOR GAS DISSOLVED IN FLUID

The means comprises a catheter (1) which can be inserted in the fluid (B) and contains a carrier fluid (3). The gases released in the fluid (B) can be diffused through the catheter wall into the carrier fluid (3). To ensure that this occurs, the catheter is designed as a double-cavity coaxial catheter (1), whose outer tube (5) is permeable for the gases. By means of a pump device (8), a continuous circulating flow of the carrier fluid (3) is maintained through the inner tube (4), the intermediate space between the outer and the inner tube (4, 5), a measurement device (6) for the partial pressure of the gases to be measured in the carrier fluid (3) and a material exchange unit (7), in which the enriched carrier fluid (3) has the gases removed from it, back into the inner tube (4). The flow path can also run in reverse. The means allows a continuous determination of the partial pressure of the gases and gas mixtures without a sample of the fluid (B) having to be removed. This is particularly important in the medical field.