Patent ID: 6851260
Filing Date: 2005-02-08
Classification: A61M,F03G

Abstract:
1. A shape memory alloy actuator comprising: a body having an activating member such that said activating member is moved between a first and a second position when said body is moved between a third and a fourth position, holding means for holding said body in said third position, said holding means comprising a pawl mechanism, at least one first wire and at least one second wire made of a shape memory alloy, said first wire being connected to said body such that shortening of the length of said first wire exerts a force on said body for moving same from said fourth to said third position, and a biasing means, selected from the group consisting of at least one of a compression spring, a tension spring, and a piston and cylinder mechanism attached to said body for biasing said body for moving same from said third to said fourth position, said second wire being arranged such relative to said holding means so that shortening of the length of said second wire releases said body from said holding means such that said biasing means may move said body from said third position to said fourth position.