Infusion device and driving mechanism for same
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United States of America Patent
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-
Oct 19, 2004
Grant Date -
Jul 10, 2003
app pub date -
Feb 20, 2003
filing date -
Sep 7, 2001
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A drive mechanism for delivery of infusion medium. A coil surrounds a piston channel. An armature is located adjacent the coil. The armature is moveable toward a forward position in response to the electromagnetic field produced by activation of the coil. A piston located within the piston channel is moveable within the channel to a forward position in response to movement of the armature. The armature and piston are moved toward a retracted position when the coil is not energized. In the retracted position, a piston chamber formed between the piston and a valve member is filled with infusion medium. As the piston is moved to its forward position, piston chamber volume is reduced and pressure within the piston chamber increases and moves the valve member into an open position. Medium from the piston chamber is then discharged into an outlet chamber.
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