Three stage valve

Details Three stage valve Three stage valve

A - Human Necessities

61

M

128/127

A61M 1/00 (2006.01) A61M 27/00 (2006.01)

Patent

CA 1236749

THREE STAGE VALVE Abstract of the Disclosure An implantable valve for allowing the passage of cerebrospinal fluid (CSF) from a ventricle of the brain to a suitable drainage location in the body includes a movable diaphragm, one side of which is in pressure communication with the drainage location of the body and the other side of which is in pressure communication with the ventricular spaces of the brain. A valve assembly, actuable by displacement of the diaphragm in response to a pressure differential applied thereto, regulates passage of CSF from the ventricular spaces to the drainage location. When differential pressure is relatively small, the valve is actuated to a constant pressure mode in which a predetermined differential pressure across the valve is maintained. In response to a sudden increase in differential pressure, the valve mechanism is actuated to a constant flow mode in which a desired relatively constant rate of fluid flow is maintained. Above a predetermined pressure differential, the valve is actuated once again to a constant pressure mode in which differential pressure above a predetermined maximum is prevented.

469536

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