Dosing device for the controlled delivery of a liquid
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United States of America Patent
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-
Jun 7, 1994
Grant Date -
N/A
app pub date -
Apr 30, 1993
filing date -
May 12, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a dosing device of the type suitable for human implantation for delivering a liquid medicament, a piston of a pump is accelerated against a detent by energization of an electromagnetic actuation system, with the electromagnetic actuation system being controlled so that it is de-energized slightly before the piston reaches the detent, with the inertia of the piston carrying the piston against the detent to complete the piston stroke. By shortening the amount of time during which the electromagnetic actuation system is energized, energy is saved. Control of the electromagnetic actuation system is undertaken by identifying a nominal stroke time for the piston by detecting the impact of the piston against the detent, and calculating an on time for the electromagnetic actuation system which is so short that the impact of the piston against the detent can still be just barely detected.
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