Infusion device and driving mechanism and process for same with actuator for multiple infusion uses
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United States of America Patent
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Sep 20, 2005
Issued Date -
N/A
app pub date -
Aug 23, 2004
filing date -
Dec 26, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
A drive mechanism for delivery of infusion medium a coil capable of being electrically activated to provide an electromagnetic field. The coil surrounds a piston channel extending in an axial direction. An armature is located adjacent the coil, on one side of the axial channel. The armature is moveable toward a forward position, in response to the electromagnetic field produced by activation of the coil. A piston is located within the piston channel and is moveable axially within the channel to a forward position, in response to movement of the armature to its forward position. The armature and piston are moved toward a retracted position, when the coil is not energized. The armature may be configured with a reduced diameter by including a coil cup for supporting the coil including a shelf portion defining at least a portion of a pole surface of the coil cup.
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