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Infusion device and driving mechanism for same

  • US 7,785,293 B2
  • Filed: 06/29/2005
  • Issued: 08/31/2010
  • Est. Priority Date: 09/07/2001
  • Status: Active Grant
First Claim
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1. A drive mechanism for delivery of infusion medium comprising:

  • an inlet for receiving infusion medium;

    an outlet for discharging infusion medium;

    a piston channel through which infusion medium is communicated between the inlet and the outlet;

    a piston located within the piston channel to define a fluid flow path between the inlet and outlet, the piston being moveable axially within the piston channel between a retracted position and a forward position to drive infusion medium toward the outlet, the piston comprising a magnetically permeable material,an armature located on one side of the piston channel and moveable between a retracted position and a forward position;

    a coil located in a position relative to the armature to generate an electromagnetic field upon energization sufficient to cause the armature and piston to move from their retracted positions to their forward positions; and

    a magnet arranged relative to at least one of the armature and the piston to impart a force on the piston sufficient to move the piston from the forward position to the retracted position upon deenergization of the coil;

    wherein the armature is arranged between the magnet and the piston and includes a first section free of magnetically permeable material through which magnetic flux from the magnet passes to the piston in a path that is free of magnetically permeable material from the magnet to the piston.

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