| 摘要 |
A peristaltic actuating element ( 30 ) is arranged against a body ( 20 ). The peristaltic actuating element ( 30 ) comprises volumes ( 34 A-G) of electromechanical material and is arranged for selectively causing a dimension change in a main motion direction ( 90 ) of the peristaltic actuating element ( 30 ) within a limited peristaltic section ( 40 ). By changing voltage signals activating the volumes ( 34 A-G), the peristaltic section ( 40 ) is caused to move along the peristaltic actuating element ( 30 ). The body ( 20 ) interacting with the peristaltic actuating element is thereby displaced relative to the peristaltic actuating element ( 30 ). Preferably, the length of the peristaltic section ( 40 ) is less than half the length of the entire peristaltic actuating element ( 30 ), more preferably much less. It is also preferred, if the peristaltic actuating element ( 30 ) is arranged so that the surface ( 32 ) interacting with the body ( 20 ) is removed therefrom within the peristaltic section ( 40 ).
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