Infusion device and driving mechanism for same
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United States of America Patent
Stats
-
Feb 14, 2006
Grant Date -
Mar 13, 2003
app pub date -
Dec 27, 2001
filing date -
Sep 7, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A drive mechanism for delivery of infusion medium has a coil and an armature moveable toward a forward position, in response to the electromagnetic field produced by activation of the coil. A piston is moveable axially within a piston 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. In the retracted position of the piston, a piston chamber is formed between the piston and a valve member and is filled with infusion medium. As the piston is moved to its forward position, the piston chamber volume is reduced and pressure within the piston chamber increases to a point where the pressure moves the valve member into an open position through an outlet.
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