Shape memory micro-mechanisms for medical ap

This paper describes the design of micro-mechanisms actuated by shape memory alloys to be used for different medical applications. They are all illustrations oj'a very simple microactuation technology conceived around a wire-like shape memory element. In the same time they show how a hybrid microsystem can be conceived and what ore the specific problems when applying shape memory micro-actuation. Four different systems are described. The firsi one is a very simple microvalve to be used in drug delivery systems. The three other examples are situated in the minimal invasive surgery area: a mirror actuation system, a zooming system, and a bending actuator for colonoscopy.

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