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Heat-activated drug delivery system and thermal actuators therefor

  • US 5,263,323 A
  • Filed: 04/02/1992
  • Issued: 11/23/1993
  • Est. Priority Date: 01/10/1989
  • Status: Expired due to Fees
First Claim
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1. An infusion system for dispensing a fluid, said system comprising:

  • a) an enclosure defining an interior chamber and having an outlet formed at one end;

    b) a syringe piston mounted for movement within said chamber, the portion of said interior chamber between said syringe piston and said outlet defining a variable volume compartment for containing a fluid; and

    c) motive means for causing said syringe piston to move toward said outlet, forcing said fluid out of said variable volume compartment, said motive means including;

    i) a thermally responsive expansion material for creating hydraulic pressure in response to a temperature increase, andii) actuator means for converting said hydraulic pressure into linear motion.

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