Fluid handling – Line condition change responsive valves – Direct response valves
Patent
1997-01-27
1998-03-10
Ferensic, Denise L.
Fluid handling
Line condition change responsive valves
Direct response valves
137529, F16K 1500
Patent
active
057250170
ABSTRACT:
A pressure control valve, fabricated using micromachining techniques, comprises, in one embodiment a substrate having a central orifice therein and having a sealed chamber formed therein, one wall of which being defined by a flexible membrane. An inlet control element is supported by the membrane such that it is disposed over the central orifice, such that normally a gap is defined between the inlet control element and the central orifice and hence the valve is open. When the pressure differential, between external pressure and pressure in the chamber, exceeds a predetermined threshold, the membrane deforms, drawing the inlet control element toward the substrate such that the inlet control element seats over the central orifice, closing the valve. In another embodiment a flexible membrane cooperates with a valve substrate to form a closed chamber, and a valve lid, coupled to the membrane, extends over one or more holes in the substrate, forming a gap between the valve lid and the substrate. When a predetermined level of pressure is applied to the valve lid, the gap closes, preventing fluid from flowing through the hole(s). Valves in accordance with the present invention may be micromachined from such materials as glass or metal, and may be incorporated in-line in the filling conduit for the reservoir of an implantable drug delivery system.
REFERENCES:
patent: 2097585 (1937-11-01), Carson
patent: 3032060 (1962-05-01), Huffman
patent: 3474783 (1969-10-01), Ulmann
patent: 3608574 (1971-09-01), Beaussant
patent: 4846215 (1989-07-01), Barree
patent: 4852605 (1989-08-01), Gouhier
patent: 5097865 (1992-03-01), Riley
patent: 5232012 (1993-08-01), Toraason
patent: 5265645 (1993-11-01), Goodwin
Comben Richard H.
Elsberry Dennis D.
Ferensic Denise L.
Kim Joanne Y.
Kinghorn Curtis D.
Medtronic Inc.
Patton Harold R.
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