Endoluminal device and method
An endoluminal device can be configured for precise positioning during deployment within a vessel. The endoluminal device can be a tack, stent, vascular implant or other type of implant. The endoluminal device can have circumferential member with an undulating configuration having multiple inward and outward apexes and struts extending therebetween. Two of the struts can be used to establish a foot for the precise positioning of the device during deployment. A method of placing the endoluminal device can include withdrawing an outer sheath such that a portion of the endoluminal device is expanded prior to the rest of the endoluminal device.
1. An intravascular implant configured to be compressed for delivery and to self-expand when deployed, comprising:
a self-expandable tubular body having a proximal end, a distal end and a central lumen extending therethrough, the body being metal and comprising a plurality of metal struts; the self-expandable tubular body comprising a zig-zag distal-most ring and a zig zag proximal-most ring, the self-expandable tubular body forming only a single cell column which comprises at least one open cell that is formed between internally facing struts of the distal-most and proximal-most rings, at least one bridge comprising a first V bend and a second V bend and a radiopaque marker positioned between the first and second V bends;
wherein the tubular body having a compression force curve being a measure of the amount of radial force required to compress the tubular body throughout a range of outer diameters, and having an expansion force curve being a measure of the amount of radial force exerted by the tubular body when the tubular body radially self-expands throughout a range of outer diameters which range is equal to or greater than 3 mm, the compression force is greater than the expansion force within the range, and the difference in radial force between the compression force curve and the expansion force curve is no more than 2 Newtons (N) at any point in the range of outer diameters.
2. The intravascular implant of claim 1 , wherein the difference in radial force between the compression force curve and the expansion force curve is no more than 1 N at any point in the range of outer diameters.
3. The intravascular implant of claim 1 , wherein the intravascular implant is a 4 French or a 6 French device.
4. The intravascular implant of claim 1 , wherein the range of outer diameters is one of: a top outer diameter of 7.5 mm and a bottom outer diameter of 3 mm; a top outer diameter of 5.5 mm and a bottom outer diameter of 1.5 mm; and a top outer diameter of 6 mm and a bottom outer diameter of 3 mm.
5. The intravascular implant of claim 1 , wherein the range of outer diameters has a top outer diameter of 6.5 mm and a bottom outer diameter of 3 mm and the difference in radial force between the compression force curve and the expansion force curve is no more than 1 N at any point in the range of outer diameters.
6. The intravascular implant of claim 1 , wherein the radial force along the expansion force curve changes no more than 1 N between any two points in the range of outer diameters.
7. The intravascular implant of claim 1 , wherein an initial static outer diameter is greater than 6 mm.
8. The intravascular implant of claim 1 , wherein the radial expansion force at any point within the range of outer diameters is less than or equal to 3 N.
9. The intravascular implant of claim 1 , wherein the range of outer diameters is a working range of the intravascular implant.
10. The intravascular implant of claim 1 , wherein the intravascular implant is no smaller than a 4 French device.
11. The intravascular implant of claim 1 , wherein the intravascular implant is no larger than a 6 French device.
12. The intravascular implant of claim 1 , wherein the radial force along the expansion force curve changes no more than 3 N between any two points in the range of outer diameters.
13. The intravascular implant of claim 12 , wherein the radial force along the expansion force curve changes no more than 2 N between any two points in the range of outer diameters.
14. The intravascular implant of claim 1 , wherein the radial expansion force at any point within the range of outer diameters is less than or equal to 5 N.
15. The intravascular implant of claim 1 , wherein the radial force along the expansion force curve drops from less than 2 N at an outer diameter of 3 to less than 1 N at an outer diameter of 6 mm.
16. The intravascular implant of claim 1 , wherein the radial expansion force is no less than 3 N over the range of outer diameters, wherein the range of outer diameters is from 3 mm to at least 6 mm.
17. The intravascular implant of claim 1 , wherein the at least one bridge comprises at least one anchor pointing in a direction that is transverse to a longitudinal direction of the tubular body.
18. The intravascular implant of claim 1 , wherein the at least one bridge comprises at least one eyelet.
19. The intravascular implant of claim 18 , wherein the radiopaque marker is held by the at least one eyelet.
20. The intravascular implant of claim 1 , having a length of no more than about 15 mm.