System and method for reducing pulsatile pressure

1. An apparatus for improving compliance of a pulmonary artery, the apparatus comprising:

a subcutaneously implantable reservoir configured to hold a fluid;

a conduit having first and second implantable ends, the first implantable end configured to be coupled to the subcutaneously implantable reservoir to provide fluidic communication between the subcutaneously implantable reservoir and the conduit;

a compliant body configured to be fully implantable, the compliant body coupled to the second implantable end of the conduit to provide fluidic communication between the compliant body and the conduit, the compliant body sized and shaped to be implanted in the pulmonary artery;

a fluid disposed in the subcutaneously implantable reservoir, conduit, and compliant body, the fluid pressurized so that the compliant body transitions between an expanded state, caused by diastolic pressure in the pulmonary artery, and a contracted state, caused by systolic pressure in the pulmonary artery; and

a fully implantable anchoring system configured to anchor the compliant body within the pulmonary artery, the anchoring system comprising wire that engages an inner wall of the pulmonary artery and remains anchored, allowing the complaint body to be periodically removed and replaced.

2. The apparatus of claim 1 , further comprising an injection port coupled to the subcutaneously implantable reservoir, the injection port configured to permit fluid filling and pressure adjustments.

3. The apparatus of claim 2 , wherein the injection port is mounted directly on the subcutaneously implantable reservoir.

4. The apparatus of claim 1 , wherein the anchoring system is configured to be anchored in the pulmonary artery distal to bifurcation of the pulmonary artery.

5. The apparatus of claim 1 , wherein the wire is removably coupled to the compliant body.

6. The apparatus of claim 1 , wherein the wire is configured to be inserted through a lumen in the conduit.

7. The apparatus of claim 1 , wherein the wire comprises at least two members at a distal end of the wire configured to expand outwardly when passed out of a lumen of the conduit distal to the distal end of the compliant body.

8. The apparatus of claim 1 , wherein the conduit is configured to be pulled proximally to remove the compliant body from the pulmonary artery.

9. The apparatus of claim 1 , further comprising a sheath having a sheath lumen therethrough, the compliant body and the conduit configured to be introduced through the sheath lumen.

10. The apparatus of claim 9 , wherein the sheath is configured to be anchored and implanted.

11. The apparatus of claim 10 , wherein the compliant body and the conduit are configured to be removable and replaceable through the sheath lumen.

12. The apparatus of claim 1 , wherein the conduit is configured to be anchored in a right ventricle, proximate a pulmonary valve, in a valve annulus, or in a wall of the pulmonary artery.

13. The apparatus of claim 1 , wherein the conduit comprises two lumens extending between the compliant body and the subcutaneously implantable reservoir, further comprising a one-way valve disposed in one of the two lumens, the one-way valve configured to permit the fluid to flow to the compliant body through one lumen and return from the compliant body through another lumen.

14. The apparatus of claim 1 , wherein the fluid is compressible.

15. The apparatus of claim 1 , wherein the fluid comprises a gas.

16. The apparatus of claim 1 , further comprising a sensor configured to monitor at least one of fluid pressure or volume.

17. The apparatus of claim 16 , wherein the sensor is disposed within the subcutaneously implantable reservoir.

18. The apparatus of claim 1 , wherein the compliant body comprises a material configured to reduce diffusion of the fluid from the compliant body.