Fluid pump without dead volume
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United States of America Patent
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-
May 5, 1998
Grant Date -
N/A
app pub date -
Sep 27, 1995
filing date -
Oct 3, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pump for delivering a fluid contained in an elastic phial includes a pump body and a movable piston fitted inside the pump body. The front end of the pump body is located on a fluid-outlet side, and the front end includes an outlet orifice (11) sealed off by an elastic membrane (24). The outlet orifice is connected to a pump duct (18) inside the pump body, and the pump duct 18 is in turn connected to a fluid-inlet orifice (15). An end (2) of the movable piston is hermetically fitted within the pump duct (18) with slight friction, and the displacement of the end (2) of the piston relative to the portion of the pump body between the inlet orifice (15) and the a stop position (16) near the outlet orifice (11) determines the quantity of fluid expelled from the pump body. The inlet orifice allows a predetermined quantity of fluid to be trapped at the end of the pump duct (18) before being expelled through the outlet orifice (11). With the exception of the front end of the pump body, the pump body and the movable piston are totally enveloped by the elastic phial.
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