Methods and apparatus for cardiac valve repair
The methods, devices, and systems are provided for performing endovascular repair of atrioventricular and other cardiac valves in the heart. Regurgitation of an atrioventricular valve, particularly a mitral valve, can be repaired by modifying a tissue structure selected from the valve leaflets, the valve annulus, the valve chordae, and the papillary muscles. These structures may be modified by suturing, stapling, snaring, or shortening, using interventional tools which are introduced to a heart chamber. Preferably, the tissue structures will be temporarily modified prior to permanent modification. For example, opposed valve leaflets may be temporarily grasped and held into position prior to permanent attachment.
1. A method of repairing a valve in a patient's body, the valve having a plurality of movable leaflets, the leaflets having a superior surface on a first side and an inferior surface on an opposing side, the method comprising:
positioning an interventional catheter having a coapting device near a distal end of the interventional catheter near the valve;
piercing through the valve leaflets with a needle containing the coapting device;
allowing the coapting device to self-expand from an unexpanded state to an expanded state;
coapting the leaflets so that at least a portion of the superior surface of one leaflet is coapted with at least a portion of the superior surface of a second leaflet; and
detaching the coapting device from the interventional catheter, the coapting device remaining coupled to the valve leaflets after the interventional catheter has been removed from the patient's body.
2. The method of claim 1 , wherein penetrating the valve leaflets comprises penetrating the leaflets with the needle disposed near the distal end of the interventional catheter, the needle carrying the coapting device.
3. The method of claim 1 , wherein coapting the leaflets comprises fixing a length of suture to the leaflets.
4. The method of claim 1 , wherein detaching the coapting device from the interventional catheter comprises releasing an anchor therefrom.
5. The method of claim 1 , wherein positioning the interventional device comprises advancing the coapting device into a heart, and wherein the valve comprises a valve of the heart.
6. The method of claim 5 , wherein the valve comprises a mitral valve.
7. The method of claim 1 , wherein penetrating the valve leaflets comprises passing the coapting device disposed near the distal end of the interventional catheter therethrough.
8. The method of claim 7 , wherein coapting device includes an anchor coupled with a length of suture.
9. The method of claim 1 , wherein the coapting device comprises an anchor near the distal end of the interventional catheter and adapted to be advanced through the leaflets.
10. The method of claim 9 , wherein the anchor has a constrained profile and an expanded profile, and wherein the expanded profile is larger than the constrained profile.
11. The method of claim 10 , wherein the anchor is substantially flat after self-expanding.
12. The method of claim 10 , wherein the anchor is coiled when constrained.
13. The method of claim 12 , wherein the anchor is uncoiled after self-expanding.