Stent delivery system with nitinol trigger wire
AssigneesCook Medical Technologies LLC, William A. Cook Australia Pty. Ltd.
InventorsDavid Ernest Hartley, Darin G. Schaeffer
Life of this patent
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Abstract
A stent graft delivery system (50) has a stent graft (74) retained on it. The stent graft has an exposed proximally extending self expanding stent (76) which is retained in a distally opening capsule (78) at the distal end of a nose cone dilator (58) on the delivery system. A trigger wire (80) extends from a release mechanism (82) the distal end of the delivery system into a first aperture (84) in the capsule, around a proximal bend (86) of the exposed stent and out of the first aperture in the capsule and extending proximally into a second aperture (88). The trigger wire prevents premature release of the exposed stent.
Claims15
A stent graft delivery system in combination with a stent graft retained on the delivery system;
- the stent graft comprising an exposed self expanding stent and the exposed stent comprising at least one bend;
- the delivery system comprising a distal end to remain outside of a patient in use and a proximal end to be introduced into the patient in use, the delivery system comprising a capsule to receive the exposed self expanding stent and to hold the exposed stent in a contracted condition during delivery thereof and a retention system to prevent premature removal of the exposed stent from the capsule;
- the retention system comprising a first aperture and a second aperture in the capsule, the retention system further comprising a trigger wire extending from the distal end of the delivery system into the first aperture in the capsule, the wire engaging the bend of the exposed stent and then extending into the second aperture, wherein the exposed stent cannot be removed from the capsule until the trigger wire has been withdrawn.
A stent graft delivery system in combination with a stent graft retained on the delivery system;
- the stent graft comprising a proximally extending exposed self expanding stent and the exposed stent comprising at least one bend;
- the delivery system comprising a distal end to remain outside of a patient in use and a proximal end to be introduced into the patient in use, the delivery system comprising a distally opening capsule at a distal end of a nose cone dilator, the capsule receiving the exposed proximally extending self expanding stent to hold the exposed stent in a contracted condition during delivery thereof, and a retention system for the exposed stent in the capsule;
- the retention system comprising an first aperture in the capsule and a second aperture proximally of the first aperture, the retention system further comprising a trigger wire extending from the distal end of the delivery system into the first aperture in the capsule, engaging the proximal bend of the exposed stent and out of the first aperture in the capsule and then extending proximally into the second aperture.
The combination as in claim 10 wherein the trigger wire comprises an nickel titanium alloy wire such as Nitinol wire and comprises a diameter of 0.016 to 0.018 inches.
A stent graft delivery system in combination with a stent graft retained on the delivery system;
- the stent graft comprising a proximally extending exposed self expanding stent and the exposed stent comprising at least one bend;
- the delivery system comprising a distal end to remain outside of a patient in use and a proximal end to be introduced into the patient in use, the delivery system comprising a distally opening capsule at a distal end of a nose cone dilator, the capsule comprising a cylindrical wall, at least a portion of which has a selected thickness, a first aperture in the cylindrical wall extending through the thickness of the wall and a second aperture extending longitudinally through the wall, the first and second apertures intersecting,
- the capsule receiving the exposed proximally extending self expanding stent to hold the exposed stent in a contracted condition during delivery thereof, and a retention system for the exposed stent in the capsule, the retention system further comprising a trigger wire extending from the distal end of the delivery system into the second aperture in the capsule, engaging the proximal bend of the exposed stent at the first aperture.
An endovascular delivery device in combination with an endoluminal prosthesis, the delivery device comprising;
- a catheter body;
- a guide wire catheter extending from the catheter body to a nose cone dilator at a proximal end of the delivery device;
- a trigger wire release mechanism disposed at the distal end of the delivery device;
- at least one trigger wire;
- the endoluminal prosthesis comprising a distal end and a proximal end, a lumen and at least one stent and being disposed on the delivery device;
- a proximal retention device disposed along at least part of the length of an outside surface of the guide wire catheter between the catheter body and the nose cone dilator, the proximal retention device comprising:
- a main inner lumen,
- a secondary outer lumen concentric to the main inner lumen, and
- at least one aperture adjacent the proximal end;
- the at least one stent being received in the main inner lumen of the proximal retention device;
- and
- at least one retention loop engaging the at least one stent within the main inner lumen and the trigger wire at the aperture of the retention device;
- where the trigger wire extends from the trigger release mechanism, through the proximal end of the endoluminal prosthesis, into the secondary outer lumen, out the aperture of the secondary outer lumen and through the retention loop and then continuing in the secondary outer lumen;
- where the trigger wire restrains the endovascular prosthesis prior to withdrawal of the trigger wire;
- and
- where the trigger wire retains a substantially straight configuration during retention within the secondary outer lumen and during withdrawal of the trigger wire.
Dependencies are inferred from the claim text.