Non-constant pressure infusion pump
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United States of America Patent
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Sep 16, 2003
Grant Date -
Oct 24, 2002
app pub date -
Mar 1, 2001
filing date -
Mar 1, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
The present invention relates to an implantable infusion pump having a refillable infusate reservoir in fluid communication with a delivery site via a flow path. This flow path includes a flow resistance. The infusion pump includes a sensing device(s), positioned relative to the flow path, to provide data regarding a flow rate along the flow path. The infusion pump effects a division of a total flow period into at least a plurality of unit dose periods, each unit dose period effecting delivery of a unit dose of infusate. The cumulative effect of delivering the total number of unit dose periods is the delivery of a desired dose over the total flow period. The present invention permits a reservoir pressure to vary over any portion of total flow period but effects a constant-pressure state over each unit dose cycle.
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