摘要:
An introducer assembly for introducing a stent-graft (70) or other device into a vessel of a patient includes a pre-shaped curved cannula (60) made preferably of a shape memory material. The curved cannula can pull the proximal end (74) of the stent-graft (70) against the inner side wall of the vessel thereby to ensure a good leak free connection at this point. The assembly is particularly useful in deploying stent-grafts into the aortic arch.
摘要:
A fitting device (104) for fitting a stent-graft (100) into a lumen of a patient includes a catheter (110), a cannula (112) reciprocably carried in the catheter (110) and a pair of gripper claws (106) in the cannula (112). The gripper claws (106) grip onto a stent (102) at the proximal end (128) of the stent-graft (100) which a suture loop (108) is tied to a stent (102) at an intermediate position along the stent graft (100). The stent-graft (100) can be curved by pulling the end-most stent (102) backwards, that is by retracting the cannula (112) into the catheter (110) while the gripper claws (106) grip onto the stent (102). The proximal end of the stent-graft (100) can also be adjusted position-wise by moving the cannula (112) into and out of the catheter (110). Thus, precise positioning and curving of the stent-graft (100) can be achieved.
摘要:
An introducer for an expandable endovascular prosthesis (20) having a self a self-expanding stent (2 1) includes a proximal prosthesis positioning mechanism (3) that has a retention device (10) to retain the self-expanding stent and a control member (22, 24, 66) to selectively release the retention device from the prosthesis. The retention device includes an opening forming a tapered cavity. The control member includes a plurality of loops (66) coupled to the prosthesis and a trigger wire (22). The trigger wire passes through a first aperture (62) of the retention device, through the plurality of loops, and through and a second aperture (64) of the retention device to retain the loops.
摘要:
A stent-graft (100) is provided with a tightenable loop element (104) having a first end terminated in a slip knot or self-tightening knot (112) and a second end which is received in and can slide in the knot (112). The knot (112) is tied by a suture to the stent-graft (100) so as to be fixed thereto. The loop (104) is fitted to the stent-graft (100) in a manner as to pass between the inside to the outside of the graft material and in such a manner that controlled curvature of the stent-graft (100) is possible, in particular control of the overlapping of adjacent stents held within the zone of the loop (104). An introducer assembly is also disclosed which includes a control cannula (120) able to the fixed to the stent-graft (100) during the deployment procedure, as well as a mechanism of suture loops (150, 152) at the proximal end of the stent-graft (100) for retaining this in a constricted form during the process of curving the latter during the deployment process.
摘要:
A stent graft (18) for deployment in a curved lumen such as the aortic or thoracic arch (130) comprises a constraining mechanism at its proximal end. A stent (4′) provided at the proximal end of the stent graft (18) includes loops of material (11) that co-operate with restraining wires (42) that extend between a central guide wire carrier (24) and a restraining wire cannula (8). The constraining mechanism acts to maintain the proximal stent (4′) constrained at three points around its circumference at both the proximal and distal ends of the proximal stent (4′). The proximal stent (4′) is thus allowed to expand after expansion of the remainder of the stent graft (18) during deployment. In an embodiment, the constraining mechanism acts to constrain two adjacent struts of the proximal stent (4′) at three points radially therearound, at the proximal end of the stent (4′) and at the distal end of the stent (4′). The proximal stent (4′) may then overlap with the interior of an adjacent stent at an inner part (31) of a curved vessel.
摘要:
An introducer assembly for introducing a stent-graft (70) or other device into a vessel of a patient includes a pre-shaped curved cannula (60) made preferably of a shape memory material. The curved cannula can pull the proximal end (74) of the stent-graft (70) against the inner side wall of the vessel thereby to ensure a good leak free connection at this point. The assembly is particularly useful in deploying stent-grafts into the aortic arch.
摘要:
There is disclosed a locking unit (100) for locking a pusher (128) to a sheath assembly (164). The locking unit (100) includes a longitudinal locking portion (102) and a radial locking portion (104). The longitudinal locking portion (102) includes a plurality of cantilevered fingers (110) provided with longitudinally extending teeth (112) on internal surfaces thereof. A nut (108) can be tightened in order to bias the cantilevered arms (110) towards a pusher (128) such that the teeth (112) indent the outer surface of the pusher (128) to produce a strong and stable locking connection thereto. The radial locking section (104) latches onto the assembly integral with the sheath (164) so as to provide a radial locking action as well as a longitudinal locking action. The locking unit (100) provides a strong and reliable locking action between the pusher (128) and the sheath assembly (164) and can be easily removed by a clinician or surgeon during the deployment process.
摘要:
An introducer for an expandable endovascular prosthesis (20) having a self a self-expanding stent (2 1) includes a proximal prosthesis positioning mechanism (3) that has a retention device (10) to retain the self-expanding stent and a control member (22, 24, 66) to selectively release the retention device from the prosthesis. The retention device includes an opening forming a tapered cavity. The control member includes a plurality of loops (66) coupled to the prosthesis and a trigger wire (22). The trigger wire passes through a first aperture (62) of the retention device, through the plurality of loops, and through and a second aperture (64) of the retention device to retain the loops.