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Shape memory alloy wire driven positive displacement micropump with pulsatile output

  • US 7,226,278 B2
  • Filed: 09/19/2005
  • Issued: 06/05/2007
  • Est. Priority Date: 04/22/2002
  • Status: Expired due to Term
First Claim
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1. An apparatus, comprising:

  • a gear engagement member comprising a shape memory wire, the wire capable attaining at least two different material conditions, a first material condition below a transformation temperature and a second material condition above a transformation temperature, wherein the wire attains a memorized configuration such that the wire can produce a work stroke as a consequence of a transition between the first and second material conditions;

    a gear adapted to engage the gear engagement member, wherein the gear engagement member is in direct contact with teeth on the gear;

    a fluid pump coupled to the gear such that when the gear is engaged with the gear engagement member and actuated, the fluid pump generates a fluid flow from the work stroke produced by the wire; and

    a fluid conduit adapted to couple the fluid pump to a fluid medication reservoir.

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