Passive-aggressive resistance: OS fingerprint evasion

A disinfection indicator mounted on medical equipment which is inserted into a channel for forceps and repeatedly used after thermal sterilization, includes a deformable portion, made of a shape memory alloy having a one-way shape memory effect, which is deformed plastically by an external force, from a shape indicating disinfection of the medical equipment to a predetermined original shape when the medical equipment is in use, and which is modified from the original shape to the shape indicating disinfection of the medical equipment when the medical equipment is heated to a temperature higher than a predetermined temperature.