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A catheter-based annuloplasty system for use in repairing a heart valve having leaflets and a valve annulus, includes a delivery catheter having a proximal end and a distal end, and an expandable stent disposed on the distal end of the catheter. An adjustable annuloplasty ring is disposed on the exp

A catheter-based annuloplasty system for use in repairing a heart valve having leaflets and a valve annulus, includes a delivery catheter having a proximal end and a distal end, and an expandable stent disposed on the distal end of the catheter. An adjustable annuloplasty ring is disposed on the expandable stent and is configured to expand and contract in response to expansion and contraction of the stent.

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1. A catheter-based annuloplasty system for use in repairing a heart valve having leaflets and a valve annulus, comprising: a delivery catheter having a proximal end and a distal end;an expandable stent disposed on the distal end of the catheter; andan adjustable annuloplasty ring disposed on the ex

1. A catheter-based annuloplasty system for use in repairing a heart valve having leaflets and a valve annulus, comprising: a delivery catheter having a proximal end and a distal end;an expandable stent disposed on the distal end of the catheter; andan adjustable annuloplasty ring disposed on the expandable stent configured to expand and contract in response to expansion and contraction of the stent, wherein the adjustable ring includes a plurality of tissue attachment members shaped for penetration into the valve annulus and configured to be triggered from a tensioned state to a relaxed state, and wherein the adjustable ring extends through at least one spring portion of each of the tissue attachment members. 2. The annuloplasty system of claim 1, wherein each tissue attachment member comprises: a first prong portion extending from a first circular spring portion;a second prong portion extending from a second circular spring portion; anda cross-member connecting the first and second circular spring portions. 3. The annuloplasty system of claim 2, wherein the adjustable ring extends through the first and second circular spring portions of each of the tissue attachment members. 4. The annuloplasty system of claim 2, wherein the cross-member includes a feature configured to be connected to hold the adjustable ring adjacent to the expandable stent. 5. The annuloplasty system of claim 1, and further comprising: a plurality of tissue attachment retaining members disposed on the expandable stent and configured to hold the tissue attachment members in the tensioned state. 6. The annuloplasty system of claim 5, wherein the tissue attachment retaining members are configured to release the tissue attachment members from the tensioned state when the adjustable ring is adjacent to the valve annulus, thereby causing the tissue attachment members to transition to the relaxed state and anchor the adjustable ring to the valve annulus. 7. The annuloplasty system of claim 6, wherein the adjustable ring is configured to be adjusted in size after the adjustable ring has been anchored to the valve annulus. 8. The annuloplasty system of claim 5, wherein the tissue attachment retaining members are formed of a shape memory material. 9. The annuloplasty system of claim 1, wherein the adjustable ring comprises a plurality of interconnected cylindrically-shaped ring segments. 10. The annuloplasty system of claim 9, wherein each of the ring segments includes a plurality of tabs that extend away from a body of the segment parallel to a surface of the adjustable ring. 11. The annuloplasty system of claim 10, wherein adjacent ones of the tabs in each ring segment are separated by a gap, and wherein each tab of each segment is positioned within one of the gaps of an adjacent segment. 12. The annuloplasty system of claim 9, wherein axial twisting of the adjustable ring causes a separation between adjacent segments and an increase in an internal diameter of the adjustable ring. 13. The annuloplasty system of claim 9, wherein a first end of the ring is co-axially aligned with and inserted into a second end of the ring. 14. The annuloplasty system of claim 13, wherein contraction of the stent causes the first end of the ring to extend farther into the second end of the ring, thereby reducing an overall diameter of the adjustable ring. 15. The annuloplasty system of claim 14, and further comprising a locking mechanism configured to lock the adjustable ring and thereby prevent further size adjustments to the ring. 16. The annuloplasty system of claim 15, wherein the locking mechanism is configured to lock a surface of the adjustable ring between asymmetrical lumens within the locking mechanism. 17. The annuloplasty system of claim 1, wherein the stent is a self-expanding stent formed of a shape memory material. 18. The annuloplasty system of claim 1, wherein the stent is a self-expanding NITINOL™ framework. 19. The annuloplasty system of claim 1, wherein the system is configured to be used off-pump to repair the heart valve of a beating heart. 20. A method of repairing a heart valve comprising leaflets and a valve annulus, the method comprising: delivering an adjustable ring having tissue attachment members to a location adjacent to the heart valve via a catheter;extending a self-expanding stent outside of the catheter, thereby causing an expansion of the adjustable ring;triggering the tissue attachment members, thereby causing the adjustable ring to be anchored to the valve annulus; andcontracting the self-expanding stent, thereby causing a reduction in size of the adjustable ring and the valve annulus. 21. The method of claim 20, and further comprising: triggering a locking mechanism on the adjustable ring after causing the reduction in size of the adjustable ring to maintain the reduced size of the ring. 22. The method of claim 20, wherein the method is performed off-pump to repair the heart valve of a beating heart. 23. A catheter-based annuloplasty system for use in repairing a heart valve having leaflets and a valve annulus, comprising: a delivery catheter having a proximal end and a distal end;an expandable stent disposed on the distal end of the catheter;an adjustable annuloplasty ring disposed on the expandable stent configured to expand and contract in response to expansion and contraction of the stent, wherein the adjustable ring includes a plurality of tissue attachment members shaped for penetration into the valve annulus and configured to be triggered from a tensioned state to a relaxed state; anda plurality of tissue attachment retaining members disposed on the expandable stent and configured to hold the tissue attachment members in the tensioned state. 24. A catheter-based annuloplasty system for use in repairing a heart valve having leaflets and a valve annulus, comprising: a delivery catheter having a proximal end and a distal end;an expandable stent disposed on the distal end of the catheter; andan adjustable annuloplasty ring disposed on the expandable stent configured to expand and contract in response to expansion and contraction of the stent, wherein the adjustable ring comprises a plurality of interconnected cylindrically-shaped ring segments, and wherein each of the ring segments includes a plurality of tabs that extend away from a body of the segment parallel to a surface of the adjustable ring.