PATIENT INTERFACE DESIGN FOR ACOUSTIC DETECTION

Respiratory patient interface (e.g., mask) structures may be modified to include acoustical feature(s) (AF) to provide differences in structure that can produce, when acoustically sensed, a unique acoustic signature for identification of a particular model mask and thereby differentiate it from other model masks. The added AF may be generally similar across different models of patient interface but have detectable differences between the models. However, the added AF of a particular model are typically substantially the same for all masks of that particular model. Such AF may, for example, be a change in material composition of a section or part of a flow path of the patient interface, a change in a dimension, such as a length, of a section or part of a flow path of the patient interface, and/or an expansion and/or contraction of a section (e.g., diameter) or part of a flow path of patient interface.