1. A device (1) for biologically decontaminating percutaneous access points or stomata of patients, including a plasma generator (4) for generating a decontaminating plasma adjacent to a treatment surface (3) of the plasma generator (4), wherein the treatment surface (3) is adaptably curved to at least partially enclosing a percutaneous access point or stoma and is placeable so as to rest at the access point or the stoma, wherein the treatment surface (3) has a flexible support (5) with at least one high voltage electrode (6) encompassed by the flexible support (5) and with at least one ground electrode (7) at the outer surface of the flexible support (5), characterized in that the ground electrode (7) is a wire winding wound around the flexible support (5).