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A method of flowing blood from a heart chamber to a coronary vessel includes providing a conduit with a first end and second end, providing the conduit within a heart wall such that the first end of the conduit is open towards the heart chamber and the second end is open towards the blood vessel, an

A method of flowing blood from a heart chamber to a coronary vessel includes providing a conduit with a first end and second end, providing the conduit within a heart wall such that the first end of the conduit is open towards the heart chamber and the second end is open towards the blood vessel, and during diastole, restricting a flow of blood from the coronary vessel to the heart chamber via the natural valve.

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1. A method of flowing blood from a heart chamber to a coronary vessel, the method comprising:providing a conduit with a first end and a second end; providing a natural valve; placing the conduit within a heart wall such that the first end of the conduit is open towards the heart chamber and the sec

1. A method of flowing blood from a heart chamber to a coronary vessel, the method comprising:providing a conduit with a first end and a second end; providing a natural valve; placing the conduit within a heart wall such that the first end of the conduit is open towards the heart chamber and the second end is open towards the blood vessel; and during diastole, restricting a flow of blood from the coronary vessel to the heart chamber via the natural valve. 2. The method of claim 1, wherein providing the natural valve includes providing a section of blood vessel containing at least one naturally occurring valve.3. The method of claim 2, wherein the section of blood vessel is a human vein.4. The method of claim 2, wherein the section of blood vessel is an autograft.5. The method of claim 2, wherein the section of blood vessel is an allograft.6. The method of claim 2, wherein the section of blood vessel is a xenograft.7. The method of claim 1, wherein providing the natural valve includes providing the natural valve inside the conduit.8. The method of claim 1, wherein the heart chamber is a left ventricle.9. The method of claim 1, wherein the coronary vessel is a coronary artery.10. A bypass system for implantation in a body of a patient, the system comprising:a tube having a first end and a second end and being configured to be implanted in a heart wall such that the first end is open towards a heart chamber and the second end is open towards a coronary vessel, the tube being further configured to permit blood to flow therethrough from the heart chamber to the coronary vessel; and a natural valve configured to restrict blood flow from the coronary vessel to the heart chamber during diastole. 11. The system of claim 10, wherein the natural valve includes a section of blood vessel containing at least one naturally occurring valve.12. The system of claim 11, wherein the section of blood vessel lines an interior of the tube.13. The system of claim 11, wherein the section of blood vessel is a human vein.14. The system of claim 11, wherein the section of blood vessel is an autograft.15. The system of claim 11, wherein the section of blood vessel is an allograft.16. The system of claim 11, wherein the section of blood vessel is a xenograft.17. The system of claim 10, wherein the natural valve is disposed inside the tube.18. The system of claim 10, wherein the heart chamber is a left ventricle.19. The system of claim 10, wherein the coronary vessel is a coronary artery.