Pressure reservoir filling process for an implantable medication

Details Pressure reservoir filling process for an implantable medication Pressure reservoir filling process for an implantable medication

1990-11-29

1993-03-30

Williams, Hezron E.

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

604141, G01F 2500, A61M 3700

Patent

active

051973227

ABSTRACT:
An improved process and related apparatus are provided for filling a pressure reservoir of an implantable medication infusion pump with a selected pressure fluid, wherein the pressure reservoir is separated by a movable wall from an adjacent medication chamber. The improved filling process includes vacuum-draw filling of the pressure reservoir with relatively purified pressure fluid in liquid state. The specific quantity of pressure fluid within the pressure reservoir is thereafter calibrated by filling the adjacent medication chamber with a calibration fluid at a predetermined positive pressure, thereby expelling excess pressure fluid from the pressure reservoir. The pressure reservoir is then sealed and the performance characteristics thereof are tested under simulated implantation conditions to confirm the capability of the pressure reservoir to maintain medication within the medication chamber under substantially constant pressure conditions.

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