Switch valve for an extracorporeal blood circuit and circuit including such a switch valve
First Claim
1. A switch valve for use in an extracorporeal blood flow circuit comprising:
- a valve housing having a chamber, four openings communicating with the chamber; and
a valve member located in the valve chamber and movable therein to change the direction of blood flow among the openings, wherein the width of the valve member is smaller than a peripheral dimension of the openings.
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Accused Products
Abstract
A switch valve for use in an extracorporeal blood flow circuit comprises a valve housing having a chamber, four openings communicating with the chamber, and a valve member located in the valve chamber. A first opening is to be connected to a patient via an arterial cannula, a second opening is to be connected to a patient via an venous cannula, a third opening is to be connected to a first inlet/oulet of a blood treatment device, and a fourth opening is to be connected to a second inlet/outlet of a blood treatment device. The valve member is movable within the valve housing to fluidly connect the first opening to either the third or the fourth opening and to fluidly connect the second opening to either the third or the fourth opening. The width of the valve member is smaller than a peripheral dimension of the openings.
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Citations
28 Claims
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1. A switch valve for use in an extracorporeal blood flow circuit comprising:
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a valve housing having a chamber, four openings communicating with the chamber; and
a valve member located in the valve chamber and movable therein to change the direction of blood flow among the openings, wherein the width of the valve member is smaller than a peripheral dimension of the openings. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 21, 22, 23)
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2. A switch valve for use in an extracorporeal blood flow circuit comprising:
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a valve housing having a chamber, four openings communicating with the chamber; and
a valve member located in the valve chamber and movable therein to change the direction of blood flow among the openings, wherein the valve member is arranged to adopt an idle position in which all four openings are interconnected. - View Dependent Claims (20)
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3. A switch valve for use in an extracorporeal blood flow circuit comprising:
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a valve housing having a chamber, four openings communicating with the chamber; and
a valve member located in the valve chamber and movable therein to change the direction of blood flow among the openings, wherein movement of the valve member does not ever fully block any one of the openings.
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24. A blood treatment equipment comprising:
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a dialyzer having a blood compartment and a dialysis fluid compartment separated by a semi-permeable membrane, an arterial needle for connection to a patient'"'"'s fistula, a venous needle for connection to a patient'"'"'s fistula downstream with respect to the arterial needle connection, a switch valve comprising;
a valve housing having a chamber, four openings communicating with the chamber, a valve member located in the valve chamber and movable therein to change the direction of blood flow among the openings, wherein movement of the valve member does not ever fully block anyone of the openings, and a connector for each respective opening, said connectors including;
a blood inlet connector, a blood outlet connector, a circuit inlet connector connected to an outlet of the dialyzer blood compartment, a circuit outlet connector connected to an inlet of the dialyzer blood compartment, an arterial line connecting the arterial needle to the blood inlet connector, a venous line connecting the venous needle to the blood outlet connector, the switch valve being operable between a normal position, wherein fluid is directed from the blood inlet connector to the circuit outlet connector and from the circuit inlet connector to the blood outlet connector, and a reversed position, wherein fluid is directed from the blood outlet connector to the circuit outlet connector and from the circuit inlet connector to the blood inlet connector.
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- 26. A blood treatment equipment according to claim 26, comprising a blood pump operating on said arterial line.
Specification