One way valve that uses fluid pressure to open and close the...

Details One way valve that uses fluid pressure to open and close the... One way valve that uses fluid pressure to open and close the...

2011-07-12

2011-07-12

Hepperle, Stephen M (Department: 3753)

Fluid handling

Line condition change responsive valves

Direct response valves

C251S149100, C251S149600

Reexamination Certificate

active

07975722

ABSTRACT:
A positive pressure one way medical valve contains an inlet (10), outlet (11), an internal flow path between the inlet and the outlet and a plunger (12) movable between a retraced sealing position, where backflow is reduced or prevented and an extended open position, where fluid can flow from the inlet to the outlet. The plunger is moved from the retraced to the extended position by insertion of a tip onto the inlet (10). A variable volume chamber (23) is defined partially by an elastomeric member (14) that is stretched, when plunger is in the extended position and reduced, when the plunger is in the retraced position so to increase or decrease the volume of the chamber respectively. A valve (50), which is movable between open and closed positions by the presence or absence of fluid passing through the inlet, immediately seals the flow pathway before the plunger is retraced.

REFERENCES:
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patent: 5431185 (1995-07-01), Shannon et al.
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patent: 5771935 (1998-06-01), Myers
patent: 6062436 (2000-05-01), Fuchs
patent: 6068617 (2000-05-01), Richmond
patent: 6089272 (2000-07-01), Brand et al.
patent: 6537258 (2003-03-01), Guala
patent: WO 03/018104 (2003-03-01), None
patent: WO 03/018105 (2003-03-01), None

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