Low profile non-symmetrical stent
A stent for use in a medical procedure having opposing sets of curved apices, where the curved section of one set of apices has a radius of curvature that is greater than the curved section of the other set of apices. One or more such stents may be attached to a graft material for use in endovascular treatment of, for example, aneurysm, thoracic dissection, or other body vessel condition.
1. A stent graft comprising:
a tube of graft material having a proximal end and a distal end;
a plurality of stents attached to the tube of graft material between the proximal and the distal ends;
a first stent of the plurality of stents, the first stent comprising a plurality of proximal apices and a plurality of distal apices, where each proximal apex of the first stent comprises a first curved portion and each distal apex of the first stent defines a second curved portion, wherein each of the first curved portions and the second curved portions comprise a radius of curvature, and the radius of curvature of the proximal apices is greater than the radius of curvature of the distal apices;
a second stent of the plurality of stents disposed immediately adjacent and distal of the first stent, the second stent comprising a plurality of distal apices and a plurality of proximal apices, where each distal apex of the second stent comprises a first curved portion and each proximal apex of the second stent defines a second curved portion, wherein each of the first curved portions and the second curved portions comprise a radius of curvature, and the radius of curvature of the distal apices is greater than the radius of curvature of the proximal apices;
wherein each distal apex of the first stent substantially abuts a proximal apex of the second stent to define an area of unstented graft material that has a perimeter defined by a proximal apex and two struts connecting the proximal apex of the first stent and a distal apex and two struts connecting the distal apex of the second stent,
wherein at least one area of unstented graft material comprises an aperture within the area of unstented graft material that is configured to receive a tubular graft therethrough; and
wherein the radius of curvature of the proximal apices of the first stent and the radius of curvature of the distal apices of the second stent is from about 4 mm to about 9 mm.
2. The stent graft of claim 1 , further comprising a layer of graft material attached to an inner surface of the tube of graft material that forms a passage extending from the aperture toward the proximal end of the stent graft.
3. The stent graft of claim 1 , wherein the radius of curvature of the distal apices of the first stent and the radius of curvature of the proximal apices of the second stent is from about 0.5 mm to about 1.5 mm.
4. The stent graft of claim 1 , wherein a ratio of the radius of curvature of the proximal apices of the first stent to the radius of curvature of the distal apices of the first stent is between about 2.6:1 to about 18:1.
5. The stent graft of claim 4 , wherein a ratio of the radius of curvature of the distal apices of the second stent to the radius of curvature of the proximal apices of the second stent is between about 2.6:1 to about 18:1.
6. The stent graft of claim 1 , wherein a ratio of the radius of curvature of the distal apices of the second stent to the radius of curvature of the proximal apices of the second stent is between about 2.6:1 to about 18:1.
7. The stent graft of claim 1 , further comprising a second area of unstented graft material having an aperture in the second area of unstented graft material wherein the aperture of the second area of unstented graft material is configured to receive a second tubular graft therethrough.
8. The stent graft of claim 1 , wherein the proximal apices of the first stent have a rounded inner radius.
9. The stent graft of claim 8 , wherein the aperture is disposed within the rounded inner radius of a proximal apex of the first stent.
10. The stent graft of claim 9 , further comprising a second aperture disposed within a rounded inner radius of a second proximal apex of the first stent, wherein the second aperture is configured to receive a second tubular graft therethrough.
11. The stent graft of claim 1 , wherein the radius of curvature of the distal apices of the first stent and the radius of curvature of the proximal apices of the second stent is 1 mm, and wherein the radius of curvature of the proximal apices of the first stent and the radius of curvature of the distal apices of the second stent is 6 mm.
12. A stent graft comprising:
a tube of graft material having a proximal end and a distal end;
a plurality of stents attached to the tube of graft material between the proximal and the distal ends;
a first stent of the plurality of stents, the first stent comprising a plurality of proximal apices and a plurality of distal apices, where each proximal apex comprises a first curved portion and each distal apex defines a second curved portion, wherein each of the first curved portions and the second curved portions comprises a radius of curvature, and the radius of curvature of the proximal apices is greater than the radius of curvature of the distal apices, and a ratio of the radius of curvature of the proximal apices to the radius of curvature of the distal apices is 6:1;
a second stent of the plurality of stents disposed immediately adjacent and distal of the first stent, the second stent comprising a plurality of distal apices and a plurality of proximal apices, where each distal apex of the second stent comprises a first curved portion and each proximal apex of the second stent defines a second curved portion, wherein each of the first curved portions and the second curved portions comprise a radius of curvature, and the radius of curvature of the distal apices of the second stent is greater than the radius of curvature of the proximal apices of the second stent, and a ratio of the radius of curvature of the distal apices of the second stent to the radius of curvature of the proximal apices of the second stent is 6:1;
wherein each distal apex of the first stent substantially abuts a proximal apex of the second stent to define an area of unstented graft material that has a perimeter defined by a proximal apex and two struts connecting the proximal apex of the first stent and a distal apex and two struts connecting the distal apex of the second stent,
wherein at least one area of unstented graft material comprises an aperture within the area of unstented graft material that is configured to receive a tubular graft therethrough; and
wherein the radius of curvature of the proximal apices of the first stent and the radius of curvature of the distal apices of the second stent is from about 4 mm to about 9 mm.
13. The stent graft of claim 12 , further comprising a second area of unstented graft material having an aperture in the second area of unstented graft material wherein the aperture of the second area of unstented graft material is configured to receive a second tubular graft therethrough.
14. The stent graft of claim 12 , wherein the proximal apices of the first stent have a rounded inner radius.
15. The stent graft of claim 14 , wherein the aperture is disposed within the rounded inner radius of a proximal apex of the first stent.