Engineered surface for providing low friction and improved comfort on devices that contact the skin or other external tissue of the user

摘要

An apparatus structured to contact external tissue such as skin of a user includes an elastomeric contacting portion that is structured to directly engage the external tissue. The contacting portion has an engineered surface (64A 64B) that includes a plurality of non random predesigned surface features (70 74B 76B 78B) designed to reduce friction and improve user comfort. In one implementation the pitch (P) between each immediately adjacent pair of the surface features (70 76B) is less than or equal to a predetermined maximum pitch value and the height (H) of each of the surface features (70 76B) is less than or equal to a predetermined maximum height value.