Device for and method of loading stents into delivery tubes
View Patent ↗A stent loading device is configured to perform a method of loading a stent into a delivery tube that comprises loading a stent into an opening of a crimping device. The stent has an initial uncompressed diameter. The method further comprises crimping the stent via the crimping device in a manner reducing the diameter of the stent from the initial diameter. Still further, the method comprises forcing the stent out of the opening of the crimping device and into a passageway of a delivery tube while oscillating the crimping device. The passageway of the delivery tube has a diameter that is less than the initial diameter of the stent and receives the stent in its compressed state.
1. A method of loading a stent into a delivery tube, the method comprising:
loading a stent into an opening of a crimping device of a stent loading device, the stent having an initial diameter, the opening having an adjustable size, the stent loading device comprising a control system and a motor driven threaded member that is functionally connected to the crimping device in a manner such that rotation of the motor driven threaded member controllably adjusts the size of the opening of the crimping device;
crimping the stent via the crimping device in a manner reducing the diameter of the stent from the initial diameter; and
forcing the stent out of the opening of the crimping device and into a passageway of a delivery tube while oscillating the size of the opening of the crimping device, and thereby oscillating the stent, by rapidly changing rotational direction of the motor driven threaded member, the control system limiting the amplitude of the oscillations of the size of the opening of the crimping device by limiting the amount the threaded member rotates during the oscillations, the passageway of the delivery tube having a diameter that is less than the initial diameter of the stent.
2. A method in accordance with claim 1 wherein the control system is a programmable control system that monitors the amount the threaded member rotates during the oscillations.
3. A method in accordance with claim 1 wherein the stent loading device comprises a stent extractor that is controlled by the control system, and the forcing of the stent out of the opening of the crimping device is achieved via the stent extractor.
4. A method in accordance with claim 3 wherein the stent extractor comprises a rod and the forcing of the stent out of the opening of the crimping device is achieved by inserting the rod into the opening of the crimping device in a manner such that the rod pushes the stent out of the crimping device and into the passageway of the delivery tube.
5. A method in accordance with claim 3 wherein the stent extractor moves relative to the opening of the crimping device as the stent is forced out of the opening of the crimping device and into the passageway of the delivery tube, and the rate of the movement of the stent extractor is user adjustable.
6. A method in accordance with claim 1 wherein the stent comprises SMA material and the method further comprises chilling the delivery tube.
7. A method in accordance with claim 1 wherein the size of the opening of the crimping device is oscillated at a rate in the range of 50 Hz to 1,000 Hz.
8. A method in accordance with claim 1 wherein the step of forcing the stent out of the opening of the crimping device occurs in a continuous motion.