Implants having high fatigue resistance, implant delivery systems, and methods of use
According to one aspect of the preset invention, a fatigue resistant stent includes a flexible tubular structure having an inside diameter, an outside diameter, and a sidewall therebetween and having apertures extending through the sidewall. According to other aspects of the invention, processes for making a fatigue resistant stent are disclosed. According to further aspects of the invention, delivery systems for a fatigue resistant stent and methods of use are provided.
1. A stent, which comprises:
a stent structure including a sidewall defining a central longitudinal axis, said sidewall includes a plurality of struts arranged to define a plurality of closed cells, each closed cell including proximal and distal circumferential row patterns of undulating struts connected at first and second opposed circumferential locations by respective first and second connectors, each of the proximal and distal row patterns having a plurality of struts extending in a general longitudinal direction with circumferentially adjacent struts being connected at respective apices, each of the proximal and distal row patterns including struts of a first strut type having a first strut width and struts of a second strut type having a second strut width greater than the first strut width, the struts of the first strut type of the proximal row pattern of each closed cell being disposed adjacent the first connector at the first circumferential location and the struts of the first strut type of the distal row pattern of each closed cell being disposed adjacent the second connector at the second opposed circumferential location.
2. The stent of claim 1 wherein the struts of the first strut type define strut lengths, at least some of which are greater than strut lengths defined by the second strut type.
3. The stent of claim 2 wherein each of the proximal and distal row patterns has at least three struts of the first strut type and at least five struts of the second strut type.
4. The stent of claim 3 wherein at least some of the struts of the first strut type have different strut lengths and wherein at least some of the struts of the second strut type have different strut lengths.
5. The stent of claim 3 wherein each closed cell includes a strut of the first type within the proximal row pattern being connected to the first connector and a strut of the second type within the distal row pattern being connected to the first connector.
6. The stent of claim 5 wherein each closed cell includes a strut of the second type within the proximal row pattern being connected to the second connector and a strut of the first type within the distal row pattern being connected to the second connector.