Abstract: device for administering liquids comprises an administering part (10) and an adhesive plaster (11). The administering part (10) is connected with a cannula stud (30) and an administering line (14) and carries a liquid. For fastening the administering part (10) to the surface of a patient's skin or the surface of an object the adhesive plaster (11) is stuck on the surface. The adhesive plaster (11) is provided with a plug-in pin (38) which is adapted to be inserted into an insertion opening (43) of the filter (10). By placing the filter (10) onto the plug-in pin (38) the administering part (10) is detachably connected with the adhesive plaster (11). If the administering part (10) is a filter with transparent housing the filter membrane is well visible since the latter is not covered by adhesive strips when the filter is fastened to the patient's body.

Abstract: A filter for medical fluids comprises a hydrophilic membrane (18) dividing the filter into an inlet chamber (20) and an outlet chamber (22). This prevents air from penetrating the outlet chamber (22). The air retained in the inlet chamber (20) is discharged through vent holes (30, 32). Each vent hole (30, 32) is covered with a hydrophobic membrane (34, 36). According to the invention one of the vent holes (30) is provided in a front wall (38) opposite the hydrophilic membrane (18). The other vent hole (32) is provided in a rear wall (46) located opposite the front wall (38) so that the two vent holes (30, 32) point in opposite directions. Owing to this arrangement of the two vent holes (30, 32) one vent hole (30, 32) points upwards irrespective of the filter position. This improves venting of the inlet chamber (20).