An endoluminal delivery system , wherein the system comprises: an introducer sheath having a proximal end , a distal end , a lumen extending between the proximal end and the distal end, and a proximal opening at the proximal end providing access to the lumen; a delivery catheter configured to be passed through the proximal opening into the lumen of the introducer sheath; an endoluminal device releasably maintained along the delivery catheter at a delivery profile that is configured for the endoluminal device to be passed through the proximal opening into the lumen of the introducer sheath while the endoluminal device is maintained in the delivery profile, the endoluminal device having an inner lumen , a first opening providing access to the inner lumen , and a second opening providing access to the inner lumen; a guidewire tube removably received by the endoluminal device such that the guidewire tube is removable from the endoluminal device when the endoluminal device is in the delivery profile, the guidewire tube passing through the first opening of the endoluminal device into the inner lumen of the endoluminal device , and out of the second opening of the endoluminal device , the guidewire tube having a first end , a second end , and a lumen configured to receive a guidewire, the guidewire tube including an enlarged feature located at any point, other than the first end and the second end of the guidewire tube , between the first end and the second end of the guidewire tube and configured to selectively prevent insertion of the guidewire tube through the proximal opening of the introducer sheath into the lumen of the introducer sheath and the first end and the second end are open to provide access to the lumen and receive the guidewire therethrough. an introducer sheath having a proximal end , a distal end , a lumen extending between the proximal end and the distal end, and a proximal opening at the proximal end providing access to the lumen; a delivery catheter configured to be passed through the proximal opening into the lumen of the introducer sheath; an endoluminal device releasably maintained along the delivery catheter at a delivery profile that is configured for the endoluminal device to be passed through the proximal opening into the lumen of the introducer sheath while the endoluminal device is maintained in the delivery profile, the endoluminal device having an inner lumen , a first opening providing access to the inner lumen , and a second opening providing access to the inner lumen; a guidewire tube removably received by the endoluminal device such that the guidewire tube is removable from the endoluminal device when the endoluminal device is in the delivery profile, the guidewire tube passing through the first opening of the endoluminal device into the inner lumen of the endoluminal device , and out of the second opening of the endoluminal device , the guidewire tube having a first end , a second end , and a lumen configured to receive a guidewire, the guidewire tube including an enlarged feature located at any point, other than the first end and the second end of the guidewire tube , between the first end and the second end of the guidewire tube and configured to selectively prevent insertion of the guidewire tube through the proximal opening of the introducer sheath into the lumen of the introducer sheath and the first end and the second end are open to provide access to the lumen and receive the guidewire therethrough. <EOS>