Patent ID: 7503902
Filing Date: 2009-03-17
Classification: A61M,F16K

Abstract:
1. A blood flow reversal valve for extracorporeal blood lines, the blood flow reversal valve comprising: a first valve portion defining first and second ports extending therethrough; a second valve portion defining first and second ports extending therethrough, the valve portions being rotatably secured to one another, the valve portions being configured to be rotated into a first position in which the first ports are aligned with one another and the second ports are aligned with one another; and a disk-shaped gasket disposed between the first and second valve portions, the disk-shaped gasket being substantially rotationally fixed relative to one of the first and second valve portions such that the first and second ports of the one of the first and second valve portions are maintained in alignment with first and second ports defined by the disk-shaped gasket when the first and second valve portions are rotated relative to one another, wherein the second valve portion comprises a detent mechanism comprising two raised members that are circumferentially spaced from one another, and the first valve portion comprises a projection adapted to fit securely between the raised members when the valve portions are in the first position, wherein an inner surface of one of the first and second valve portions defines first and second annular channels, and the disk-shaped gasket comprises first and second annular raised features extending from a surface of the gasket, the first and second annular raised features arranged concentrically with respect to one another with the first annular raised feature extending along a perimeter region of the disk-shaped gasket and the second annular raised feature extending from a central region of the disk-shaped gasket, the first annular raised feature configured to extend into the first annular channel, and the second annular raised feature configured to extend into the second annular channel, wherein one of the first and second valve portions comprises multiple resilient retaining members that extend inwardly from and are circumferentially spaced around a side wall of the one of the first and second valve portions, the multiple resilient members being configured to cooperate with a surface of the other of the first and second valve portions to secure the first and second valve portions to one another and to provide a first compressive force to the perimeter of the disk-shaped gasket, and one of the first and second valve portions comprises a center pin extending along a rotational axis of the one of the first and second valve portions, the center pin being configured to cooperate with a surface of the other of the first and second valve portions to rotatably secure the first and second valve portions to one another and to provide a second compressive force to the central region of the disk-shaped gasket.