Medication infusion device using negatively biased ambient pressure medication chamber
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United States of America Patent
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Dec 6, 2011
Grant Date -
Apr 27, 2006
app pub date -
Dec 6, 2005
filing date -
Jun 25, 2003
priority date (Note) -
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Abstract
A method and apparatus for infusing medication into a patient's body using a medication chamber referenced to ambient pressure. The apparatus includes a medication chamber enclosed by a peripheral wall which includes a movable portion configured to transfer exterior ambient pressure into the chamber. Means are provided for exerting a negative bias force acting on the movable portion in a direction opposed to the ambient pressure force. Thus, the resultant pressure in the chamber will be negative with respect to ambient pressure, reducing the risk that the chamber can be overpressurized and produce an unintended medication discharge.
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