Vascular repair devices
A stent graft includes a graft sleeve, a bare stent and at least one stent at the proximal end of the graft sleeve distal to the bare stent. The at least one stent includes proximal apices that are nested between adjacent distal apices of the bare stent, and an amplitude defined as a distance extending along the longitudinal length of the stent graft. The at least one stent has a relaxed diameter greater than that of a diameter of the graft sleeve and is secured along its entirety to the graft sleeve. The amplitude of the at least one stent is less than that of the bare stent amplitude. An outward radial force of the at least one stent against the graft sleeve at any given diameter of the stent graft is greater than that of the bare stent. Stent grafts may be used in methods to treat vascular disease.
1. A stent graft, comprising:
a) a graft sleeve having a proximal end, a distal end, a sleeve diameter and a major longitudinal axis;
b) a bare stent having struts defining distal apices and proximal apices, the struts connecting the distal and the proximal apices and having a bare stent amplitude defined as a distance extending along a longitudinal length of the stent graft, the bare stent having a relaxed diameter that is greater than the sleeve diameter, the distal apices of the bare stent being secured at the proximal end of the graft sleeve, and the proximal apices of the bare stent extending beyond the proximal end of the graft sleeve; and
c) at least one stent at the proximal end of the graft sleeve distal to the bare stent, the at least one stent including struts defining distal apices and proximal apices, the proximal apices being nested between adjacent distal apices of the bare stent, the at least one stent having an amplitude defined as a distance extending along the longitudinal length of the stent graft and the at least one stent having a relaxed diameter greater than that of the sleeve diameter and being secured along its entirety to the graft sleeve, wherein the amplitude of the at least one stent is less than that of the bare stent amplitude, whereby an outward radial force of the at least one stent against the graft sleeve at any given diameter of the stent graft is greater than that of the bare stent.
2. The stent graft of claim 1 , further including a distal stent having distal apices, proximal apices and struts connecting distal apices and proximal apices, the proximal and distal apices of the distal stent being greater in number than the proximal and distal apices of the bare stent, the distal stent having a relaxed diameter greater than the sleeve diameter, and the distal apices of the distal stent being adjacent the distal end of the graft sleeve.
3. The stent graft of claim 1 , wherein the bare stent amplitude is about 2.5 cm to 4.0 cm.
4. The stent graft of claim 1 , wherein the amplitude of the at least one stent is about 1.3 cm to 1.5 cm.
5. The stent graft of claim 1 , wherein a radius of curvature of the distal apices of the bare stent is substantially equal to a radius of curvature of the distal and proximal apices of the at least one stent.
6. The stent graft of claim 1 , further including a longitudinal support member positioned asymmetrically about the major longitudinal axis of the graft sleeve.