Method for deploying an endoluminal prosthesis at a surgical site
A system for implanting a prosthesis includes a control lumen and a nose cone affixed at a distal end of the control lumen. At least one supporting wire is affixed at one end, is substantially parallel to a major axis of the control lumen and is free at an opposite end, wherein the free end of at least one of the supporting wires is arcuate. Alternatively, a system for implanting a prosthesis includes at least one suture extending from a nose cone affixed to a distal end of a control lumen. The suture extends from the nose cone to a proximal end to a stent graft extending about the control lumen and from the stent graft to a fixed location on the control lumen. The suture is releasable from the stent graft by remote activation, whereby the suture separates from the nose cone to thereby deploy the stent graft.
1 . A method for implanting a prosthesis, comprising the steps of:
a) delivering a stent graft through an artery to an aneurysm site of a patient, the stent graft being radially constrained by an inner sheath, with an apex clasp fixed to a distal end of a control tube and slideable along the control lumen, the stent graft further being longitudinally constrained by a plurality of supporting wires extending from a buttress, from the control lumen or from the control tube extending about and slideable along the control lumen, the plurality of supporting wires clustered at and extending from an inferior side of the stent graft and wherein the free end of at least one of the supporting wires is arcuate, and extends through a loop within a proximal end of the stent graft;
b) partially retracting the inner sheath from the stent graft, whereby the supporting wire at least partially restricts longitudinal movement of the proximal end of the stent graft until the proximal end of the stent graft is secure within the artery to thereby prevent rotation of a portion of the proximal end of the stent graft at an inferior portion of the artery;
c) retracting the inner sheath; and
d) retracting the supporting wire, thereby removing the supporting wire from the loop and deploying the stent graft within the artery at the aneurysm site in the patient, and e) retracting the apex clasp along the control lumen.
2 . The method of claim 1 , wherein the control lumen and the supporting wire are retracted jointly.
3 . The method of claim 2 , wherein the inner sheath and supporting wire are retracted jointly.
4 . The method of claim 1 , wherein the supporting wire has at least one stop, the stop limiting movement of the loop along the supporting wire.
5 . The method of claim 1 , wherein the stent graft and the inner sheath each include a radiopaque marker longitudinally aligned along a path of relative movement of the inner sheath and stent graft, but spaced apart from each other during deployment of the stent graft, whereby the partial retraction of the inner sheath will cause overlap of the radiopaque markers.
6 . The method of claim 5 , wherein the radiopaque markers are on superior portions of the inner sheath and the stent graft.
7 . The method of claim 6 , wherein the radiopaque marker in the inner sheath is asymmetric.
8 . The method of claim 6 , wherein the radiopaque marker of the stent graft is elongate and substantially aligned with a major longitudinal axis of the inner sheath.
9 . The method of claim 1 , wherein the inner sheath is releasably secured at a distal end within a cavity defined by a proximal end of the nose cone, and further including the steps of:
a) partially retracting the inner sheath to release said distal end of the inner sheath from the nose cone and thereby cause partial deployment of the stent graft;
b) at least partially retracting the nose cone to within the stent graft;
c) advancing the stent graft to a final position within the artery; and
d) jointly retracting the inner sheath, the nose cone and the supporting wires to fully deploy the stent graft within the artery at the aneurysm site in the patient.
10 . The method of claim 9 , wherein the inner sheath defines at least one through hole at a proximal end of the inner sheath.
11 . The method of claim 1 , wherein the stent graft is further constrained at one end by the apex clasp, and further including the step of releasing the apex clasp prior to retraction of the supporting wire from the loop in the graft stent.
12 . The method of claim 1 , wherein the stent graft further includes at least one radiopaque marker.
13 . The method of claim 12 , wherein the radiopaque marker is located on the stent graft facing away from a concavity of a curve defined by the control lumen.
14 . The method of claim 13 , wherein the inner sheath further includes at least one radiopaque marker.
15 . The method of claim 14 , wherein the radiopaque marker of the inner sheath is located on the inner sheath facing away from the concavity of the curve defined by the control lumen and the radiopaque marker of the inner sheath overlaps at least one radiopaque marker of the stent graft when the stent graft is partially deployed.
16 . The method of claim 1 , wherein the stent graft is further constrained by a pusher support tube distal or proximal to the fixed end of the supporting wire.
17 . The method of claim 1 , wherein the aneurysm site is an abdominal aorta.
18 . The method of claim 1 , wherein the aneurysm site is in an ascending aorta.
19 . The method of claim 1 , wherein the aneurysm site is a thoracic aorta.
20 . The method of claim 1 , wherein at least one supporting wire includes a stop, along the cantilever section of the support wire and prior to the arcuate free end, having a diameter greater than that of the wire.