It’s a recognised problem that people who have to wear a surgical cast for a long period develop circulatory problems, leading to eg a certain amount of muscle wastage.
Today’s invention attempts to lessen the severity of such symptoms. It consists of a process in which two or three cheap old mobile phones are strapped onto the limb in question before being encased in plaster (or hard shell bandage).
These can be called periodically and caused to vibrate, thus promoting local circulation and helping to preserve tissue health.