Patent ID: 6413238
Filing Date: 2002-07-02
Classification: A61M

Abstract:
A fluid dispensing device comprising:a housing having an internal fluid reservoir divided by a movable fluid-tight partition into first and second chambers on opposite sides of said partition; electrically operated gas generation/extraction module for moving a gas into or out of said first chamber, said gas therein exerting or reducing pressure on said partition; controllable source of electric current for operation of said module, said source connected to a controller for controlling said source to vary the amount or polarity or both of said electrical current to said module and thereby operate said module to change its rate of gas generation or extraction, said controller being responsive to a measurable parameter associated with said device; fluid outlet from said second chamber for dispensing of fluid contained in said second chamber exteriorly of said device in response to said pressure on said partition; and sensor means for detection and measurement of said parameter over time and generation of a signal to said controller indicating quantity and direction of any change in said parameter, said controller in response to said signal indicating said change in said parameter varying said electric current to said module to effect said change in rate of gas generation or extraction; whereby said change in said rate of gas generation or extraction effects a change in gas pressure in said first chamber and resultant change in said pressure on said partition, said pressure change being in a direction and amount sufficient to keep said fluid flow from said second chamber at any time from exceeding predetermined minimum and maximum values of said parameter.