PATIENT INTERFACE DEVICE HAVING TIGHTENING INDICATOR

摘要

The present invention relates to patient interface, comprising a patient interface (12; 112) for delivering a gas to a user arranged to be tightened towards the user's face, and at least one tightening indicator (48; 148) for indicating an optimum tightening position of the patient interface (12; 112), wherein the at least one tightening indicator (48; 148) is arranged at the patient interface (12; 112) and configured to indicate the optimum 5 tightening position at a predetermined position of the patient interface with respect to the user's face.