The present invention discloses a safety device for a bracelet including a system for adjusting the circumferential length of the bracelet. The polymer electrolyte membrane can provide excellent mechanical strength, is not deteriorated by heat even at a temperature higher than 100\xb0C. The apparatus may be used to facilitate placement and insertion of a needle or catheter into a patient. A ram piston of the TEM machine is movable between a load position and a process position.