Burr-hole flow control device

A surgically implantable flow control device for controlling the flow of fluid from one portion of a body to another, the device comprising:

• a base including an inlet port and a valve seat surrounding the inlet port;
• a flow control member secured to the base and including a membrane resiliently biased to contact the valve seat in a manner forming a releasable seal therebetween to provide controlled resistance to proximal-to-distal fluid flow through the device;
• and
• a membrane shield overlying an outlet side of the membrane and including an needle guide aperture therethrough in alignment with the inlet port.

A surgically implantable flow control device for controlling the flow of fluid from one portion of a body to another, the device comprising:

• a base including an inlet port and a valve seat surrounding the inlet port;
• a flow control member secured to the base and including an asymmetric membrane resiliently biased to contact the valve seat in a manner forming a releasable seal therebetween to provide controlled resistance to proximal-to-distal fluid flow through the device, the membrane including a septum portion overlying the inlet port and a relatively thin portion responsive to fluid pressure differentials on inlet and outlet sides thereof;
• and
• a membrane shield overlying an outlet side of the membrane and including a needle guide aperture therethrough over the septum portion.