HANDLE ASSEMBLIES FOR STENT GRAFT DELIVERY SYSTEMS AND ASSOCIATED SYSTEMS AND METHODS
Handle assemblies for stent graft delivery systems and associated methods are disclosed herein. In several embodiments, a handle assembly for a stent graft delivery system includes a movable pushing component configured to deliver a distal portion of the stent graft to an arterial target site. The assembly further includes a moveable pulling component configured to interface with the pushing component and provide a compression force to the distal portion of the stent graft. The stent graft comprises a helix angle and the pulling component is configured to move relative to the pushing component at a ratio corresponding to the helix angle.
1 - 14 . (canceled)
15 . A stent delivery system for deploying a stent, comprising:
a handle for advancing and unsheathing a stent, wherein the handle comprises a dual-threaded internal lead screw configured to engage with a first lead screw and a second lead screw,
wherein the first lead screw is coupled to a tubular enclosure covering the stent and the second lead screw is selectively coupleable to the stent via a dilator,
wherein the first lead screw and second lead screw are of opposing handedness such that rotation of the internal lead screw causes longitudinal translation of the tubular enclosure and stent in opposite directions, and
wherein the first lead screw and second lead screw have respective pitches that enable synchronized, opposing longitudinal translation of the tubular enclosure and stent at a predetermined payout ratio to deploy the stent.
16 . The stent delivery system of claim 15 wherein the predetermined payout ratio is equal to a helix angle of the stent.
17 . The stent delivery system of claim 15 wherein the predetermined payout ratio is configured to reduce the movement of the stent during unsheathing of the stent.
18 . The stent delivery system of claim 17 wherein the predetermined payout ratio of first lead screw to second lead screw is between about 1:1 and 2:1.
19 . The stent delivery system of claim 18 wherein the predetermined payout ratio of first lead screw to second lead screw is about 1.5:1.
20 . The stent delivery system of claim 15 wherein the handle further comprises a slider mechanism configured to provide incremental stent deployment and reshaping.
21 . The stent delivery system of claim 15 wherein the handle further comprises a tip-release slider.
22 . The stent delivery system of claim 15 wherein the handle further comprises a cuff mechanism configured to provide incremental stent deployment.
23 . The stent delivery system of claim 15 wherein the handle defines one or more lockable positions configured to control incremental stent deployment.
24 . The stent delivery system of claim 23 wherein the handle further comprises audio feedback upon placement of the cuff mechanism into the one or more lockable positions.
25 . The stent delivery system of claim 15 further comprising a lumen extending axially through the handle and configured to carry contrast or other fluid.
26 . The stent delivery system of claim 15 further comprising a seal configured to block fluid from traveling into the handle.
27 . The stent delivery system of claim 15 wherein the second lead screw is configured to be in mechanical communication with the stent via a dilator.
28 . The stent delivery system of claim 27 wherein, upon rotation of the housing around a longitudinal axis, the first lead screw pulls the tubular enclosure in a proximal direction and the second lead screw pushes a proximal end of the stent in a distal direction to provide simultaneous advancement of the stent and retraction of the tubular enclosure.
29 . The stent delivery system of claim 15 wherein the first and second lead screws have semi-circular cross-sections.
30 . The stent delivery system of claim 15 wherein the handle comprises at least one keyway spline that engages an axial groove in the first lead screw or second lead screw.
31 . The stent delivery system of claim 30 wherein the handle assembly comprises ergonomic contours.
32 . A handle assembly for a stent graft delivery system, the handle assembly comprising:
a movable pushing component configured to deliver a distal portion of the stent graft to an arterial target site; and
a moveable pulling component configured to interface with the pushing component and provide a compression force to the distal portion of the stent graft,
wherein the stent graft comprises a helix angle, and
the pulling component is configured to move relative to the pushing component at a ratio corresponding to the helix angle.
33 . The handle assembly of claim 32 wherein:
the pushing component comprises a first lead screw coupled to a rotatable shaft and having a first thread pitch; and
the pulling component comprises a second lead screw coupled to the shaft and having a second thread pitch different from the first thread pitch.
34 . The handle assembly of claim 32 further comprising a lumen extending axially through the handle assembly and configured to carry contrast or other fluid.
35 . A handle assembly for housing, advancing, and unsheathing a stent graft, the housing assembly comprising:
a first travel lead screw configured to be mechanically coupled to a sheath covering the stent graft;
a second travel lead screw configured to be mechanically coupled to the stent graft via a dilator; and
an internal lead screw engaged with the first and second travel lead screws,
wherein the first and second travel lead screws have opposing pitch angles such that rotation of the internal lead screw causes longitudinal translation of the sheath and stent graft in opposing directions, and
wherein the first and second travel lead screws have pitch frequencies that enable opposing longitudinal translation of the sheath and stent graft at a predetermined payout ratio.