Methods and apparatus for loading a prosthesis onto a delivery system
A device for loading a prosthesis onto a delivery system includes a first housing having a central bore, One or more actuators on the first housing may be actuated radially inward to selectively compress a discrete portion of the prosthesis disposed in the central bore.
1. A method for loading a prosthesis onto a delivery system, the method comprising:
passing a prosthetic valve into a housing to compress a first end of the prosthetic valve to from a first diameter to a second diameter smaller than the first diameter;
compressing a plurality of commissure posts of the prosthetic valve from the second diameter to a third diameter smaller than the second diameter while other portions of the prosthetic valve on the first end remain at the second diameter; and
loading the plurality of commissure posts of the prosthetic valve onto a delivery device.
2. The method of claim 1 , wherein passing the prosthesis into the housing comprises passing the prosthetic valve through a constant diameter portion of a central channel in the first housing.
3. The method of claim 1 , wherein compressing the plurality of commissure posts of the prosthetic valve from the second diameter to the third diameter comprises actuating one or more actuators on the housing, the one or more actuators selectively engaging the plurality of commissure posts.
4. The method of claim 3 , wherein actuating the one or more actuators comprises depressing one or more pins or fingers radially inward to engage the plurality of commissure posts, the plurality of commissure moving radially inward from the second diameter to the third diameter, the one or more pins or fingers passing through a wall of the housing.
5. The method of claim 4 , wherein depressing comprises simultaneously depressing the one or more pins or fingers.
6. The method of claim 1 , wherein passing the prosthetic valve into the housing to compress the first end of the prosthetic valve from the first diameter to the second diameter comprises passing the prosthetic valve through a tapered central channel in the housing.
7. The method of claim 6 , wherein passing the prosthetic valve through the tapered central channel comprises pushing or pulling the prosthetic valve therethrough.
8. The method of claim 6 , wherein passing the prosthetic valve through the tapered central channel comprises shaping the prosthetic valve to have a circular cross-section.
9. The method of claim 1 , wherein the delivery device comprises an inner shaft and an outer shaft slidably disposed thereover, and wherein loading the plurality of commissure posts of the prosthetic valve onto the delivery device comprises disposing the plurality of commissure posts between the inner shaft and outer shafts.
10. The method of claim 1 , wherein loading the plurality of commissure posts of the prosthetic valve onto a delivery device comprises releasably engaging the commissure posts with the delivery device.
11. The method of claim 1 , wherein the prosthetic valve is fabricated from a nickel titanium alloy, and the method further comprises cooling the prosthetic valve to a temperature less than or equal to the austenitic finish temperature of the prosthetic valve.
12. The method of claim 11 , wherein cooling the prosthetic valve comprises cooling the prosthetic valve in chilled saline.
13. The method of claim 1 , wherein the diameter of the prosthetic valve is compressed from the first diameter to the second diameter in a first housing, and wherein the diameter of the prosthetic valve is compressed from the second diameter to the third diameter in a second housing, and wherein the method further comprises coupling the first housing with the second housing.
14. The method of claim 13 , further comprising uncoupling the first, housing from the second housing after the diameter has been compressed from the first diameter to the second diameter.
15. The method of claim 1 , further comprising supporting an inner surface of the prosthetic valve with a support element.