Abstract: A device (100A) for treating skin (S) comprises a skin treatment member, a skin contacting surface (10), a mounting member (104) for mounting the skin treatment member (110) and the skin contacting surface (107), and friction controlling means (124, 126, 134) configured and arranged to control friction between the skin contacting surface (107) and the skin (S) to be treated, in at least one controlled friction area (122) of the skin contacting surface (107), during use when the skin contacting surface (107) is moved over the skin (S). In particular, the friction controlling means (124, 126, 134) are adapted to introduce a slip motion of the controlled friction area (122) relative to the mounting member (104) in a direction corresponding to a local direction of extension of the skin contacting surface (107).

Abstract: The present invention relates to a member (14, 24, 26) of a patient interface (10) for providing a flow of breathable gas to a self-ventilating patient (12). The member (14, 24, 26) comprises a wear-out indicator (32) for indicating a wear-out of the member (14, 24, 26) to the patient (12). The wear-out indicator (32) comprises an elastic structure (34) that appears in a first colour in an unstressed condition and is configured to reversibly change its apparent colour when being stretched and returned to its unstressed condition again. The elastic structure (34) is configured to indicate a wear-out of the member (14, 24, 26) by appearing in a second colour in its unstressed condition when the structure (34) has lost at least a part of its elasticity, wherein the second colour is different from the first colour.

Abstract: The present invention relates to a wear-out assessment system (10) comprising a patient interface (12) for delivering a flow of breathable gas to an airway of a patient, wherein the patient interface (12) comprises a first wireless communication unit (18), a communication device (14) comprising a second wireless communication unit (19) configured to wirelessly communicate with the first wireless communication unit (18) and a wear-out assessment unit (16) for determining wear-out data relating to a wear-out of the patient interface (12). The first and second wireless communication unit (18, 19) are configured to exchange at least parts of the wear-out data.

Abstract: Patient interface (50) optically indicating a user that a member (22) of the patient interface (50) needs to be replaced due to wear. In particular, it relates to a member (22) for patient interface (50) which comprises at least one functional material (32, 34) having a predefined functionality and at least one indicator (28, 30) wherein the concentration of said at least one indicator (28, 30) in said member (22) correlates with the predefined functionality of said at least one functional material (32, 34).

Abstract: Patient interface devices (8) structured to deliver a flow of breathing gas to an airway of a patient include a member (16) structured to contact and adhere to a face of the patient responsive to the patient interface being donned by the patient, the member having a contact surface and an adhesive layer (34) provided on the contact surface.