Disclosed is a device (1) for biologically decontaminating percutaneous access points or the stomata of patients, by means of a plasma generator (4) for generating a decontaminating plasma adjacently to a treatment surface (3) of the plasma generator (4). In order to at least partially surround a percutaneous access point or stomata, the treatment surface (3) is curved to be adaptable and can be laid against the percutaneous access point or stomata.