A self-humidifying fuel cell is made by preparing a porous substrate, coating the substrate with a zeolitic material and filling the pores with a proton-conducting material. This protective layer forming solution is applied to a film surface of a photomask plate photosensitive emulsion layer produced by forming the film surface of the photosensitive emulsion layer on a substrate. Then, determining if the status is in a first state that indicates that all physical ports in the interface card are inaccessible. The second housing is rotatable with respect to the first housing, so that either an included angle is defined between the second housing and the first housing or the second housing and the first housing are folded together. It is possible then to depress the martensite deformation temperature below body temperature such that when the device is used in a body lumen for medical treatment, the nickel-titanium device remains completely in the austenitic phase without appearance of stress-induced martensite even if the device is placed under stress. The spiral structure is implemented by removing part of the metal layer to form a pitch structure.