Patent ID: 8083718

Claim:
A device for pumping a predetermined volume of fluid, comprising: a displacement cavity for holding the fluid; a fluid inlet conduit and a fluid outlet conduit in communication with the cavity; a plunger engaging the cavity the cavity having a first projection and a second projection to limit the travel of the plunger in the cavity; a biasing element linked to the plunger moving the plunger to a first position compressing the fluid in the cavity; a shape memory actuator, having a high temperature phase with a remembered configuration and a low temperature phase with a malleable configuration, connected to the plunger; a programmable pulse generating circuit providing pulsed currents to the shape memory actuator, wherein a current on state heat transforms the shape memory actuator to the high temperature phase and moves the plunger against the biasing element to a second position, and a current off state allows the shape memory actuator to cool to the low temperature phase so that the biasing element moves the plunger to the first position, the heating and cooling defining a single actuation cycle; and wherein each pulsed cycle delivers the predetermined volume of fluid through the fluid outlet.