| 摘要 |
<p>A flow control device (10) for use in a subcutaneously implanted physiological shunt system includes a relatively rigid base (20) and a resiliently flexible encasement (24) which defines a fluid flow path therethrough from an inlet (12) to an outlet (14). Two valves (26, 28) for controlling the flow of fluid through the device are situated serially within the fluid flow path between the inlet (12) and outlet (14). The fluid flow path includes a first fluid conduit (34) which directs fluid through both valves (26, 28), and a second fluid conduit (36) which bypasses the first valve (26) and directs fluid only through the second valve (28). The first valve (26) is constructed to provide a greater resistance to flow through the device than the second valve (28), and when the second fluid conduit is unobstructed, fluid will tend to flow through the second fluid conduit and bypass the first valve.</p> |
