A movement actuator includes an elongate filament made of a flexible material, and a strip of shape memory alloy disposed on the surface of one side of the filament. The shape memory alloy is responsive to actuation signals, heat or electrical signals, for changing its shape and when its shape changes,...http://www.google.fr/patents/US5747993?utm_source=gb-gplus-shareBrevet US5747993 - Movement actuator/sensor systems
