Assembly and method for loading a self-expanding collapsible heart valve
An assembly for collapsing a prosthetic heart valve includes a compression member and a pusher member. The compression member has a first open end with a first diameter, a second open end with a second diameter less than the first diameter, and a tapered wall between the first open end and the second open end. The pusher member has a base adapted to engage an end of the valve. The pusher member and the compression member are movable relative to one another between an initial position in which the base of the pusher member is relatively far from the first open end of the compression member and an operative position in which the base of the pusher member is relatively close to the first open end of the compression member. Movement of the pusher and compression members from the initial position to the operative position radially compresses the valve.
1. A device for collapsing a self-expanding prosthetic heart valve, comprising:
a compression member having a first open end with a first diameter, a second open end with a second diameter less than the first diameter, and a tapered wall decreasing uniformly in diameter between the first open end and the second open end, the tapered wall defining an open space adapted to receive the valve, the compression member having a fixed length between the first open end and the second open end;
a pusher member having a base adapted to engage an end of the valve, the pusher member and the compression member being movable relative to one another between an initial position in which the base of the pusher member is relatively far from the first open end of the compression member and an operative position in which the base of the pusher member is relatively close to the first open end of the compression member and closer to the first open end than to the second open end, wherein movement of the pusher member and the compression member from the initial position to the operative position pushes the valve through the open space such that the valve is radially compressed by the tapered wall of the compression member as the valve advances through the open space;
a first fastener on the pusher member, the first fastener including a plurality of spaced arms each extending in a longitudinal direction from the base of the pusher member to a free end, each of the plurality of arms residing about an exterior of the compression member in the operative position; and
a second fastener adjacent the second open end of the compression member, wherein engagement of the first fastener with the second fastener in the operative position secures the pusher member to the compression member.
2. The device of claim 1 , wherein each of the plurality of arms extends substantially orthogonally from the base.
3. The device of claim 2 , wherein the free end of each of the plurality of arms includes a receiving channel oriented in a direction substantially orthogonal to the longitudinal direction.
4. The device of claim 3 , wherein the second fastener includes a base projecting radially outward from the second open end of the compression member and adapted to be received in the receiving channels in an assembled condition of the pusher member and the compression member.
5. The device of claim 1 , wherein the compression member includes a rim projecting radially outward from the first open end and adapted to be received between the plurality of arms in an assembled condition of the pusher member and the compression member.
6. The device of claim 5 , wherein each of the plurality of arms includes a receiving channel oriented in the longitudinal direction and extending from the free end of the arm toward the base of the pusher member.
7. The device of claim 6 , wherein the compression member includes a plurality of ribs extending in the longitudinal direction between the first open end and the second open end, each rib being adapted to be received in one of the receiving channels during movement of the pusher member and the compression member from the initial position toward the operative position.
8. The device of claim 7 , wherein the rim includes a plurality of recesses, each recess lying between one of the ribs and a remainder of the rim.
9. The device of claim 1 , wherein each of the plurality of arms includes a first receiving channel adjacent the free end and oriented in a direction substantially orthogonal to the longitudinal direction, and a second receiving channel oriented in the longitudinal direction and extending from the free end of the arm toward the base of the pusher member.
10. The device of claim 9 , wherein the first receiving channel intersects with the second receiving channel on each of the plurality of arms.
11. The device of claim 1 , wherein the pusher member includes an annular wall projecting from the base, the annular wall defining a cavity sized and shaped to receive the end of the valve.
12. The device of claim 11 , wherein the annular wall has an axis of revolution and the pusher member further includes an aperture through the base, a center of the aperture being coincident with the axis of revolution of the annular wall.