A stent with varying porosity is described. The stent can be comprised of multiple stents attached together. A braided stent may have selected regions of increased thickness. The stent may be comprised of wires that are welded together at their ends in order to minimize vessel trauma. The stent may comprise a helically wound radiopaque wire wound through the stent.
1. A stent comprising:
a first region that has a first porosity and an adjacent second region that has a second porosity that is higher than said first porosity;
wherein said first region and said second region are both formed from a single first wire that is woven together with itself, forming a single, simultaneously-woven, tubular shape woven on a single stent mandrel;
wherein said first region further comprises a plurality of mechanical ties, each of which connect a first stent wire portion and a second stent wire portion overlapping said first stent wire;
wherein each of said plurality of mechanical ties further comprises a first coil having a first inner diameter and that is disposed around only said first stent wire portion; and,
wherein each of said plurality of mechanical ties further comprises a second coil having a second inner diameter that is larger than said first inner diameter; said second coil being connected to said first coil.
2. The stent of claim 1 , wherein said first region is woven with a first braid pattern and said second region is woven with a second braid pattern.
3. The stent of claim 1 , wherein said single first wire has a larger diameter within said first region than in said second region.
4. The stent of claim 1 , wherein said second coil is disposed around said first stent wire portion and said second stent wire portion.
5. The stent of claim 1 , wherein said second coil is disposed around only said first stent wire portion.
6. The stent of claim 1 , wherein each of said plurality of mechanical ties further comprise a third coil having a third inner diameter equal to said first inner diameter; said third coil being disposed around only said first stent wire portion.
7. The stent of claim 1 , wherein each of said plurality of mechanical ties further comprise a third coil having a third inner diameter equal to said first inner diameter; said third coil being disposed around only said second stent wire portion.
8. A stent comprising:
a first wire braided on a single mandrel and solely forming both a tubular first braided region having a first porosity, and forming a tubular second braided region having a second porosity that is higher than said first porosity;
wherein said tubular first region further comprises a plurality of mechanical ties, each of which is connect a first portion of said first wire and to a second portion of said first wire overlapping said first portion of said at least one wire;
wherein each of said plurality of mechanical ties further comprises a first coil having a first inner diameter and that is disposed around only said first portion of said first wire; and,
wherein each of said plurality of mechanical ties further comprises a second coil having a second inner diameter that is larger than said first inner diameter; said second coil being connected to said first coil.
9. The stent of claim 8 , wherein said tubular first region is woven with a first braid pattern and said tubular second region is woven with a second braid pattern.
10. The stent of claim 8 , wherein said first wire has a larger diameter within said tubular first region than in said tubular second region.