Tissue shaping device
An anchor anchors a therapeutic device having an elongated body within a body lumen. The anchor includes a fixation member carried on the device which is adjustable from a first configuration that permits placement of the device in the body lumen to a second configuration that anchors the device within the body lumen. The anchor further includes a lock that locks the fixation member in the second configuration. The fixation member may be locked in any one of a plurality of intermediate points between the first configuration and a maximum second configuration.
1. A method of performing mitral valve annuloplasty on a patient's heart comprising:
percutaneously delivering a mitral valve device to a coronary sinus in a collapsed delivery configuration within a catheter, the mitral valve device comprising a first expandable anchor, a second expandable anchor, and an elongate body extending therebetween, the elongate body defining a longitudinal axis of the mitral valve device;
deploying the first expandable anchor from the catheter;
expanding the first expandable anchor in the coronary sinus;
anchoring the first expandable anchor in an anchored configuration in the coronary sinus, wherein in the anchored configuration the first expandable anchor comprises a flexible elongate member and a securing member for securing a first and second end of the flexible elongate member therein at a distal end of the securing member, the securing member generally aligned with the elongate body along the longitudinal axis, a first segment of the flexible elongate member extending from a distal end of the first expandable anchor to a proximal end of the first expandable anchor to engage the elongate body proximal a distal end of the elongate body, and a second segment of the flexible elongate member extending from where the first segment engages the elongate body to the distal end of the first expandable anchor, the first segment crossing the second segment between the distal and proximal ends of the first expandable anchor; and
anchoring the second expandable anchor in the coronary sinus.
2. The method of claim 1 , wherein expanding the first expandable anchor comprises allowing the first expandable anchor to self-expand, and wherein deploying the first expandable anchor from the catheter causes the first expandable anchor to self-expand.
3. The method of claim 2 , wherein anchoring the first expandable anchor in the anchored configuration comprises locking the first expandable anchor in the anchored configuration.
4. The method of claim 1 , wherein anchoring the first expandable anchor in the anchored configuration comprises locking the first expandable anchor in the anchored configuration.
5. The method of claim 4 , wherein engagement of the first and second segments of the flexible elongate member to the elongate body comprises a loop in the flexible elongate member around the elongate body, and wherein locking the first expandable anchor in the anchored configuration comprises moving the loop from a first side of a lock element to a second side of the lock element.
6. The method of claim 5 , wherein locking the first expandable anchor in the anchored configuration comprises moving the loop from a proximal side of the lock element to a distal side of the lock element.
7. The method of claim 6 , wherein moving the loop comprises applying a distally directed force on the first expandable anchor with the catheter.
8. The method of claim 5 , wherein expanding the first expandable anchor comprises causing the first expandable anchor to self-expand by deploying the first expandable anchor from the catheter, wherein self-expansion of the first expandable anchor causes the loop to move distally.
9. The method of claim 1 , wherein in the collapsed delivery configuration, a location where the first segment crosses the second segment is at a first axial position along the longitudinal axis relative to the securing member, and the location is at a second axial position when the first expandable anchor is in the anchored configuration.
10. The method of claim 9 , wherein deploying the first expandable anchor causes the first expandable anchor to self-expand from the catheter, and wherein causing the first expandable anchor to self-expand causes the location to move away from the first axial position.
11. The method of claim 10 , wherein causing the first expandable anchor to self-expand causes the location to move distally from the first axial position.
12. The method of claim 11 , wherein causing the first expandable anchor to self-expand further causes the location to move radially outward relative to the securing member.
13. The method of claim 9 , wherein the first axial position is proximal to the second axial position.
14. The method of claim 1 , further comprising recapturing an anchor.
15. The method of claim 14 , wherein recapturing an anchor comprises recapturing the first expandable anchor subsequent to expanding the first expandable anchor.
16. The method of claim 15 , wherein recapturing the first expandable anchor comprises applying a distally directed force with the catheter on proximal portions of the first and second segments of the flexible elongate member to collapse the proximal portions radially inward toward the securing member and recapture the first expandable anchor within the catheter.
17. The method of claim 15 , wherein recapturing the first expandable anchor can occur after locking the first expandable anchor in the anchored configuration.
18. The method of claim 14 , wherein recapturing an anchor comprises recapturing the second expandable anchor.