Valve system and method with multi-directional pumping

1. An implantable valve system comprising:

a housing with a single dome-shaped resilient membrane defining a reservoir in fluid communication with at least two ports and having a longitudinal axis;

at least a first set of opposing sealing features disposed on upper and lower surfaces within the housing, the opposing sealing features being disposed in the center region of the reservoir;

the single dome-shaped membrane capable of being depressed by a human finger to bring the sealing features together to substantially restrict fluid from passing through at least one of one of the ports and to divide the reservoir into a first pumping chamber and a second pumping chamber;

the single dome-shaped membrane further capable of being depressed additionally by a rolling motion of the finger to drive fluid through the other of the ports; and

wherein one of the sealing features includes a detent and the other of the sealing features includes a recess to matingly receive the detent.

2. The system of claim 1 wherein the first set of opposing sealing features is disposed transverse to the longitudinal axis of the housing.

3. The system of claim 1 wherein the first set of opposing sealing features extends substantially perpendicularly across the reservoir to establish first and second pumping chambers when the sealing features are brought together.

4. The system of claim 1 in which the housing further includes a floor portion which defines one of the sealing features.

5. A method for clearing an obstruction in a catheter implanted in a patient, comprising:

locating a valve system implanted sub-dermally in the patient, the valve system having a housing with a single dome-shaped resilient membrane defining a reservoir in fluid communication with at least two ports and having at least a first set of opposing sealing features disposed on upper and lower surfaces within the housing, the opposing sealing features being disposed in the center region of the reservoir;

depressing the single dome-shaped membrane with one finger to bring the sealing features together to substantially restrict fluid from passing through at least one of one of the ports and to divide the reservoir into a first pumping chamber and a second pumping chamber; and

moving the finger in a rolling motion to additionally depress the single dome-shaped membrane to drive fluid through the other of the ports to clear the obstruction.

6. A method for clearing obstructions in at least two implanted catheters, comprising:

locating a valve system implanted sub-dermally in the patient, the valve system having a housing with a single dome-shaped resilient membrane defining a reservoir in fluid communication with at least two ports and having at least a first set of opposing sealing features disposed on upper and lower surfaces within the housing, the opposing sealing features being disposed in the center region of the reservoir;

depressing the single dome-shaped membrane with one finger to bring the first set of sealing features together to substantially restrict fluid from passing through at least one of one of the ports and to divide the reservoir into a first pumping chamber and a second pumping chamber;

moving the finger in a first rolling motion in a first direction to additionally depress the single dome-shaped membrane to drive fluid in the first direction through the other of the ports to clear a first obstruction; and

moving the finger in a second rolling motion in a second direction to additionally depress the single dome-shaped membrane to drive fluid in the second direction through the one of the ports to clear a second obstruction.