PCT No. PCT/EP97/00669 Sec. 371 Date Jul. 22, 1998 Sec. 102(e) Date Jul. 22, 1998 PCT Filed Feb. 13, 1997 PCT Pub. No. WO97/29681 PCT Pub. Date Aug. 21, 1997A measuring device for determining the oxygen partial pressure in human brain tissue has a probe (5) with a tube (7) of tissue-compatible plastic material in a measuring region surrounding an electrolyte-filled volume (8). Immersed in the electrolyte, which contains acetate, is a polaragraphic cathode (11) with a limited exposed surface and an anode (13). The tube is oxygen permeable in the measuring region. The electrodes are electrically connected to a measuring apparatus which applies a DC voltage at a first polarity to the electrodes (11, 13) and determines a measuring current using a measuring amplifier. A regenerating device causes the electrodes to be supplied with a regenerating voltage reversed from the first polarity for times and at current magnitudes based on the measurement current and duration.
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