Techniques for percutaneous mitral valve replacement and sealing
View Patent ↗Apparatus and methods are described, including one or more valve support guide members that are delivered to one or more commissures of a native atrioventricular valve of a patient. A prosthetic valve support is advanced toward the native valve along the one or more valve support guide members and placed at the native valve. A prosthetic valve is coupled to the valve support. One or more sealing elements facilitate sealing of an interface between the prosthetic valve support and the native valve. Other applications are also described.
1. A method, comprising:
placing an annular element of a prosthetic valve support against an annulus of a native atrioventricular valve of a patient;
subsequently, delivering a prosthetic valve, having a main frame and one or more snares coupled to the main frame, to the native atrioventricular valve; and
deploying the prosthetic valve at the native valve, the step of deploying comprising:
ensnaring at least one leaflet of the native valve with the one or more snares, and
expanding the prosthetic valve such that an outer surface of the main frame of the prosthetic valve defines a cross-sectional area that is not more than 90% of an area defined by an annulus of the native atrioventricular valve.
2. The method according to claim 1 , further comprising:
determining the area defined by the annulus of the native atrioventricular valve of the patient; and
selecting the prosthetic valve by determining that the outer surface of the main frame of the prosthetic valve defines the cross-sectional area that is not more than 90% of the area defined by the annulus,
the selecting of the prosthetic valve facilitating sealing of the native valve with respect to the prosthetic valve by facilitating closing of leaflets of the native valve around the prosthetic valve, upon deployment of the prosthetic valve.
3. The method according to claim 2 , wherein selecting the prosthetic valve comprises selecting a prosthetic valve having a material disposed on an outer surface thereof.
4. The method according to claim 3 , wherein selecting the prosthetic valve comprises selecting a prosthetic valve having a material that prevents tissue growth disposed on an outer surface thereof.
5. The method according to claim 3 , wherein selecting the prosthetic valve comprises selecting a prosthetic valve having a material that promotes tissue growth disposed on an outer surface thereof.
6. The method according to claim 1 , wherein expanding the prosthetic valve comprises expanding the prosthetic valve such that the outer surface of the main frame of the prosthetic valve defines a cross-sectional area that is less than 80% of the area defined by the annulus.
7. The method according to claim 6 , wherein expanding the prosthetic valve comprises expanding the prosthetic valve such that the outer surface of the main frame of the prosthetic valve defines a cross-sectional area that is less than 60% of the area defined by the annulus.
8. The method according to claim 2 , wherein deploying the prosthetic valve comprises deploying at least a portion of the prosthetic valve within the prosthetic valve support.
9. The method according to claim 8 , wherein deploying the at least the portion of the prosthetic valve within the prosthetic valve support comprises expanding the at least the portion of the prosthetic valve such that the at least the portion of the prosthetic valve applies a radial force to the prosthetic valve support.
10. The method according to claim 1 , wherein the one or more snares are coupled to a downstream portion of the main frame, and wherein delivering the prosthetic valve comprises delivering the prosthetic valve having the one or more snares coupled to the downstream portion of the main frame.
11. The method according to claim 1 , wherein deploying the prosthetic valve comprises expanding at least a portion of the prosthetic valve within the prosthetic valve support.
12. The method according to claim 1 , wherein placing the annular element against the annulus comprises pushing the annular element against the annulus using a percutaneously-advanceable pushing element, and wherein the method further comprises:
after placing the annular element against the annulus, and during the deployment of the prosthetic valve, holding the annular element against the annulus by continuing to push the annular element against the annulus using the pushing element; and
subsequently, removing the pushing element from the annular element.