Tension member routing elements in transcatheter stented prosthesis tensioning system
The disclosure relates to transcatheter stented prosthesis delivery devices including transition elements that route, constrain, support and reduce damage to tension member wear as tension in the tension members is varied to adjust the compression of a stented prosthesis loaded onto the delivery device. Various disclosed tension elements include inserts, edge treatments and guides proximate a distal portion of the delivery device upon which the stented prosthesis is loaded. In some embodiments, the transition feature is positioned proximate a location where at least one tension member transitions from a first orientation that is not parallel to the distal portion to a second orientation that is generally parallel to the distal portion. Further embodiments disclose configurations and methods of selectively locking and unlocking a longitudinal and/or rotational position of the stent frame with respect to the distal portion of the delivery device.
1. A delivery device for delivering a stented prosthesis to a target site; the delivery device comprising:
an elongate tension member that can compressively retain the stented prosthesis to the delivery device; and
a shaft assembly having a distal portion configured to retain the stented prosthesis; the shaft assembly further having six transition elements secured to the distal portion, the six transition elements provided in pairs and each transition element at least partially defining a lumen; wherein the elongate tension member extends in a first direction distally along a length of the distal portion, the elongate tension member is then routed through at least one lumen and then extends in a second direction that is different than the first direction; wherein the transition element provides a rounded edge over which the tension member contacts as the tension member extends from the first direction to the second direction.
2. The delivery device of claim 1 , wherein a plurality of elongate tension members are provided.
3. The delivery device of claim 1 , wherein the transition elements are spaced along a length of the distal portion.
4. The delivery device of claim 1 , further comprising the stented prosthesis, wherein the second direction is around the stented prosthesis.
5. The delivery device of claim 1 , wherein one transition element has a surface finish less than 20 micro inch RMS.
6. The delivery device of claim 1 , wherein one transition element includes a straight portion connected to a curved portion; wherein the curved portion at least partially defines the respective lumen.
7. The delivery device of claim 6 , wherein the curved portion includes an end that is secured to the distal portion.
8. The delivery device of claim 1 , wherein the two transition elements of each pair are offset with respect to one another.
9. The delivery device of claim 1 , wherein the two transition elements of each pair are parallel with respect to one another.
10. The delivery device of claim 1 , wherein at least one lumen is defined by the one transition element and the distal portion.
11. The delivery device of claim 1 , wherein one transition element extends around less than an entirety of a circumference of the distal portion.
12. The delivery device of claim 1 , wherein the distal portion defines a plurality of apertures for receiving one transition element.
13. The delivery device of claim 1 , including two transition elements that are identically shaped.
14. The delivery device of claim 1 , wherein one lumen defines a plane that is perpendicular to the distal portion.
15. The delivery device of claim 1 , wherein one transition element extends radially from the distal portion.
16. A delivery device for delivering a stented prosthesis to a target site; the delivery device comprising:
an elongate tension member that can compressively retain the stented prosthesis to the delivery device; and
a shaft assembly having a distal portion configured to retain the stented prosthesis; the shaft assembly further having a transition element secured to the distal portion, the transition element at least partially defining a lumen; wherein the elongate tension member extends in a first direction distally along a length of the distal portion, the elongate tension member is then routed through the lumen and then extends in a second direction that is different than the first direction; wherein the transition element provides a rounded edge over which the tension member contacts as the tension member extends from the first direction to the second direction;
wherein the distal portion includes a hub having a plurality of apertures through which the tension member is routed.
17. The delivery device of claim 16 , wherein the apertures are circumferentially spaced.
18. The delivery device of claim 16 , wherein the tension member extends through two apertures of the hub.