Annuloplasty procedures, related devices and methods
Devices and methods are disclosed for the treatment or repair of regurgitant cardiac valves, such as a mitral valve. An illustrative annuloplasty device can be placed in the coronary sinus to reshape the mitral valve and reduce mitral valve regurgitation. The disclosure also provides improved techniques for cardiac pacing.
1. A snare catheter, comprising: a) an elongate core member having a proximal end and a distal end; b) an elongate intermediate tubular member having a proximal end, a distal end and defining an elongate lumen therethrough for slidably receiving the elongate core member therein; c) a collapsible tubular perforated body formed from a plurality of elongate filaments attached at a proximal end thereof to the distal end of the elongate intermediate tubular member, and at a distal end thereof to the distal end of the elongate core member, wherein relative axial displacement of the distal end of the elongate intermediate tubular member toward the distal end of the elongate core member causes the collapsible tubular perforated body to expand radially outwardly and for the elongate filaments to mutually separate, and relative axial displacement of the distal end of the elongate intermediate tubular member away from the distal end of the elongate core member causes the collapsible tubular perforated body to collapse radially inwardly and for the elongate filaments members to collapse together; d) a target wire disposed within the collapsible tubular perforated body that extends along the elongate core member and has a proximal end attached to the elongate intermediate tubular member and a distal end attached to the elongate core member, wherein the target wire is configured to assume a first generally straight configuration when the collapsible tubular perforated body is collapsed radially inwardly, and a second substantially nonlinear configuration when the collapsible tubular perforated body is expanded radially outwardly; and e) an elongate tubular longitudinally displaceable sheath having a proximal end, a distal end and defining an elongate lumen therethrough for slidably receiving the elongate core member, elongate intermediate tubular member, collapsible tubular perforated body, and target wire therein when the collapsible tubular perforated body is in a generally radially collapsed state.
2. The snare catheter of claim 1 , wherein the elongate core member is a tubular member defining a guidewire lumen therethrough.
3. The snare catheter of claim 1 , further comprising an atraumatic distal tip formed from compliant material that is attached to the distal end of the elongate core member to facilitate passage through tortuous anatomy.
4. The snare catheter of claim 1 , further comprising radiopaque marker bands disposed near the distal end of the catheter and the distal end of the elongate intermediate tubular member.
5. The snare catheter of claim 1 , further comprising a plurality of radiopaque marker bands formed on the target wire.
6. The snare catheter of claim 1 , wherein the target wire is formed at least in part from radiopaque material.
7. The snare catheter of claim 1 , wherein the collapsible tubular perforated body is formed at least in part from radiopaque material.
8. The snare catheter of claim 1 , wherein the target wire includes at least one loop formed therein when it is longitudinally contracted.
9. The snare catheter of claim 1 , wherein the target wire includes a plurality of loops formed therein when it is longitudinally contracted.
10. The snare catheter of claim 8 , wherein the target wire and loop substantially lay in a single plane parallel to a longitudinal axis of the catheter when the target wire is longitudinally contracted.
11. The snare catheter of claim 8 , wherein the target wire and loop define a three dimensional geometry when the target wire is longitudinally contracted.
12. The snare catheter of claim 1 , further comprising a second target wire, wherein the target wire each define at least one loop therein when the target wires are longitudinally contracted.
13. The snare catheter of claim 1 , wherein the target wire includes at least one undulation formed therein when it is longitudinally contracted.
14. The snare catheter of claim 13 , wherein the target wire substantially lays in a single plane parallel to a longitudinal axis of the catheter when the target wire is longitudinally contracted.
15. The snare catheter of claim 13 , wherein the target wire substantially defines a three dimensional geometry when the target wire is longitudinally contracted.
16. The snare catheter of claim 1 , wherein the target wire includes composite wire.
17. The snare catheter of claim 1 , wherein the target wire includes a core portion made from a first material, and a cladding portion made from a second material different from the first material.