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 capable of being rotated with respect to each other from a fully open position continuously through partially open positions to a closed position, and wherein the first and second surfaces define a space therebetween;
an aperture in the second rigid member through which fluid communication is provided between the first and second fluid-path portions when the first and second rigid members are in the fully open position or in one of the partially open positions with respect to each other, wherein fluid flowing between the first and second fluid-path portions flows through the groove as well as the aperture; and
a sealing means disposed between the first and second surfaces to provide a seal between the first and second rigid members for preventing fluid from leaking out of the space.
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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
20 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 capable of being rotated with respect to each other from a fully open position continuously through partially open positions to a closed position, and wherein the first and second surfaces define a space therebetween;
an aperture in the second rigid member through which fluid communication is provided between the first and second fluid-path portions when the first and second rigid members are in the fully open position or in one of the partially open positions with respect to each other, wherein fluid flowing between the first and second fluid-path portions flows through the groove as well as the aperture; and
a sealing means disposed between the first and second surfaces to provide a seal between the first and second rigid members for preventing fluid from leaking out of the space. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. 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 capable of being rotated with respect to each other from a fully open position continuously through partially open positions to a closed position, and wherein the first and second surfaces define a space therebetween;
an aperture in the second rigid member through which fluid communication is provided between the first and second fluid-path portions when the first and second rigid members are in the fully open position or in one of the partially open positions with respect to each other, wherein fluid flowing between the first and second fluid-path portions flows through the groove as well as the aperture; and
a seal disposed between the first and second surfaces for preventing fluid from leaking out of the space between the first and second rigid members. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A stopcock control valve comprising:
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a valve seat member defining a hollow area, said valve seat member having an aperture;
a rigid member having an outer circumferential surface, wherein said outer circumferential surface having a groove defined thereon, said groove tapering from a large volume to a small volume, wherein said rigid member rotatably fits within said hollow area of said valve seat member; and
two o-rings on said valve seat member. - View Dependent Claims (20)
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Specification