The present invention provides improved medical introducer devices which incorporate a single or multi-layer PTFE peelable sheath. The cover member is inserted into the container body atop the garment, followed by the cap. Wall thickness of the nozzle can be selectively varied in each section drawn down or pulled. At least one parameter of the operating recipe is determined based on the comparison. The second connector is provided with a detector for detecting secure connection thereof to the anchorage of the vehicle seat.