Stopcock valve
First Claim
1. A stopcock control valve comprising:
- a first rigid member having a first surface, the first rigid member defining a first fluid-path portion with a first terminus at the first surface;
a second rigid member having a second surface, the second rigid member defining a second fluid-path portion with a second terminus at the second surface,wherein the first terminus includes a groove defined on the first surface, the groove tapering from a large cross-sectional area to a small cross-sectional area,wherein the first and second rigid members are rotatable mounted with respect to each other so as to provide alternately (i) a fully open position (ii) a partially open position and (iii) a closed position, andwherein the first and second surfaces define a space therebetween;
a resilient sealing member disposed in the space between the first and second surfaces and extending from the second surface to the first surface,the sealing member defining an aperture positioned to provide in the fully open position fluid communication between the first and second fluid-path portions,the sealing member being sealingly mounted to the second surface so that in the closed position the sealing member provides a seal preventing flow between the first and second fluid-path portions,the sealing member being located with respect to the groove to provide in the partially open position fluid communication between the first and second fluid-path portions through the groove as well as the sealing member'"'"'s aperture; and
seal means disposed with respect to the space defined by the first and second surfaces for preventing flow of fluid out of the space except through the first fluid-path portion.
2 Assignments
0 Petitions
Accused Products
Abstract
A cassette for controlling the flow of IV fluid from a patient to a source. The cassette preferably includes, along the fluid passage through the cassette, first and second membrane-based valves on either side of a pressure-conduction chamber, and a stopcock-type valve. The stopcock valve is preferably located downstream of the second membrane-based valve, which is preferably located downstream of the pressure-conduction chamber. The stopcock control valve preferably has two rigid cylindrical members with complementary surfaces, wherein one member includes a tapered groove defined on its complementary surface. The two complementary surfaces define a space therebetween, instead of having an interference fit, and a resilient sealing member is disposed in this space. When the first and second rigid members are in an open position with respect to each other, the sealing member defines an aperture through which fluid communication is provided between the fluid-path portions defined respectively by the two rigid members. When the first and second rigid members are in the closed position with respect to each other, the sealing member provides a seal preventing flow between the fluid-path portions. The membrane defining the valving chamber of the second membrane-based valve is preferably large and resilient, so that the valving chamber may provide a supply of pressurized intravenous fluid to the patient, when the valve is closed and the stopcock valve provides a restriction downstream of the valve. The pressure-conduction chamber preferably has a membrane that is stable in the empty-chamber position but relatively unstable in the filled-chamber position.
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Citations
14 Claims
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1. A stopcock control valve comprising:
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a first rigid member having a first surface, the first rigid member defining a first fluid-path portion with a first terminus at the first surface; a second rigid member having a second surface, the second rigid member defining a second fluid-path portion with a second terminus at the second surface, wherein the first terminus includes a groove defined on the first surface, the groove tapering from a large cross-sectional area to a small cross-sectional area, wherein the first and second rigid members are rotatable mounted with respect to each other so as to provide alternately (i) a fully open position (ii) a partially open position and (iii) a closed position, and wherein the first and second surfaces define a space therebetween; a resilient sealing member disposed in the space between the first and second surfaces and extending from the second surface to the first surface, the sealing member defining an aperture positioned to provide in the fully open position fluid communication between the first and second fluid-path portions, the sealing member being sealingly mounted to the second surface so that in the closed position the sealing member provides a seal preventing flow between the first and second fluid-path portions, the sealing member being located with respect to the groove to provide in the partially open position fluid communication between the first and second fluid-path portions through the groove as well as the sealing member'"'"'s aperture; and seal means disposed with respect to the space defined by the first and second surfaces for preventing flow of fluid out of the space except through the first fluid-path portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A stopcock control valve comprising:
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an inner rigid member having an outer circumferential surface, the member defining an inner fluid-path portion with an outer terminus at the outer circumferential surface, an outer rigid member, which is hollow so as to receive the inner member, the outer member having an inner circumferential surface, the outer member defining an outer fluid-path portion with an inner terminus at the inner circumferential surface, wherein the inner and outer members are rotatable mounted with respect to each other so as to provide alternately (i) an open position and (ii) a closed position, and wherein at least one of the inner and outer termini includes a groove defined on the surface of the corresponding circumferential surface, the groove tapering from a large cross-sectional area to a small cross-sectional area; and a resilient sealing member, disposed between the inner and outer circumferential surfaces, for preventing flow between the inner and outer fluid-path portions in the closed position, the resilient sealing member defining an aperture for permitting flow between the inner and outer fluid-path portions in the open position.
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10. A stopcock control valve comprising:
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an inner rigid member having an outer circumferential surface; an inner fluid-path portion defined by the inner rigid member, the inner fluid-path portion having first terminus at the outer circumferential surface; an outer rigid member having an inner circumferential surface, wherein the inner and outer rigid members are rotatably mounted with respect to each other and define a space therebetween; an outer fluid-path portion defined by the outer rigid member, the outer fluid-path portion having a second terminus at the inner circumferential surface; a groove defined on a first of the inner and outer circumferential surfaces and extending from the corresponding terminus, the groove tapering from a large cross-sectional area at the corresponding terminus to a small cross-sectional area; a resilient sealing member disposed in the space between the inner and outer rigid members, the sealing member being sealingly mounted to a second of the inner and outer circumferential surfaces for preventing flow between the inner and out fluid-path portions in a closed position; an aperture defined by the sealing member, the aperture being located to provide fluid communication between the inner and outer fluid-path portions in an open position, the aperture being located with respect to the groove to provide flow through the groove in a partially open position; and seal means disposed with respect to the space defined by the inner and outer rigid members for preventing flow of fluid out of the space except through the inner and outer fluid-path portions. - View Dependent Claims (11, 12)
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13. A stopcock control valve comprising:
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an inner rigid member having an outer circumferential surface; first means for providing flow through the inner rigid member to a first terminus at the outer circumferential surface; an outer rigid member having an inner circumferential surface, wherein the inner and outer rigid members are rotatably mounted with respect to each other and define a space therebetween; second means for providing flow through the outer rigid member to a second terminus at the inner circumferential surface; third means, defined on the outer circumferential surface and extending from the first terminus, for providing a flow path of varying resistance; fourth means, located on the inner circumferential surface, for permitting flow between the first and second means in an open position and for permitting flow through the third means in a partially open position; fifth means, disposed in the space between the inner and outer rigid members, for providing a seal about the fourth means and for preventing flow between the first and second means in an closed position; and sixth means disposed with respect to the space defined by the inner and outer rigid members for preventing flow of fluid out of the space except through one of the first and second means. - View Dependent Claims (14)
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Specification