Leaflet suturing
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 suturing tool for suturing valve leaflets comprising:
an outer shaft having a lumen extending from a proximal end to a distal end;
first and second needle receptacles comprising channels disposed in a sidewall of the outer shaft proximate the distal end thereof;
an inner shaft having a longitudinal axis, a proximal end, a central region and a distal region, the distal region having a circumference, said inner shaft slidably disposed within said lumen;
first and second needles removably coupled to said inner shaft and received within said first and second receptacles, said first and second needles linearly movable relative to the outer shaft in a direction substantially parallel to the longitudinal axis;
suture thread attached to the first and second needles;
first and second leaflet receptacles formed between the needles and an outer wall of the inner shaft, the leaflet receptacles receiving the leaflets; and
first and second needle catches coupled to the outer shaft near the distal end thereof, wherein each of the needle catches comprise a detent mechanism that cooperates with one of the needles so as to capture the needle, and wherein the captured needle is released from the inner shaft when the outer shaft is retracted proximally relative to the inner shaft, thereby drawing each needle and a portion of the suture through the leaflets.
2. The suturing tool of claim 1 , wherein the second needle receptacle is disposed on an opposite side of the suturing tool relative to the first receptacle.
3. The suturing tool of claim 1 , further comprising a fastener coupled with the suture and adapted to secure the suture with the valve leaflets.
4. The suturing tool of claim 3 , wherein the fastener is a knot or a mechanical fastener.
5. The suturing tool of claim 3 , wherein the fastener is a mechanical fastener in the form of a clip frictionally engaged with the suture.
6. The suturing tool of claim 4 , wherein the mechanical fastener is a restrictive collar disposed around the suture.
7. The suturing tool of claim 4 , wherein the mechanical fastener comprises a shape memory or superelastic material.
8. The suturing tool of claim 1 , wherein the first needle and the outer shaft cooperatively define an interlock region for locking the needle to the outer shaft.
9. The suturing tool of claim 1 , wherein said first and second receptacles further comprise means for retaining the first and second needles.
10. The suturing tool of claim 1 , wherein the first and second needle each comprise a notch and the first and second receptacles include a protuberance sized to lock with said notch.
11. The suturing tool of claim 1 , wherein the second leaflet receptacle is disposed on an opposite side of the suturing tool relative to the first leaflet receptacle.
12. The suturing tool of claim 1 , wherein the detent mechanism comprises a protuberance extending laterally from the outer shaft.
13. The suturing tool of claim 12 , wherein each needle comprises a receptacle for receiving the protuberance.
14. The suturing tool of claim 1 , wherein the detent mechanism is disposed in one of the channels.