Esophageal stents with helical thread
Stents as described herein can comprise a tubular body in which a midbody extends to a first end and also extends to an opposing second end, where the midbody includes a thread arranged helically along at least a portion of its length. The thread can exhibit various shapes and dimensions selected to enhance particular aspects of performance when the stent placed in an anatomical structure of a patient.
1. A stent comprising:
a tubular body having a longitudinal axis, a midbody extending between a first end and a second end, and a helical thread circumferentially arranged on an outer surface of the midbody, wherein the helical thread comprises a plurality of turns and an interthread space,
wherein the interthread space defines an interior space of the midbody having a cylindrical profile and having a profile diameter, and wherein the helical thread protrudes radially from the cylindrical profile at a thread height that is from about 2.5% to about 30% of the profile diameter.
2. The stent of claim 1 , wherein the interthread space has a constant length.
3. The stent of claim 1 , wherein the interthread space has a length that varies.
4. The stent of claim 1 , wherein the tubular body comprises a mesh structure.
5. The stent of claim 1 , further comprising a cover coupled to the tubular body.
6. The stent of claim 1 , wherein the thread height is from about 0.5 mm to about 5 mm.
7. The stent of claim 1 , wherein the helical thread has a cross-sectional profile shape selected from a circle, an ellipse, or a triangle.
8. The stent of claim 7 , wherein the cross-sectional profile shape is an isosceles triangle.
9. The stent of claim 7 , wherein the cross-sectional profile shape is a buttress shape comprising:
a thrust face oriented at a first angle from perpendicular to the longitudinal axis, and
a bracing face oriented at a second angle from perpendicular to the longitudinal axis, where the second angle is greater than the first angle.
10. The stent of claim 1 , wherein the helical thread extends onto at least one of the first end and second end.
11. The stent of claim 1 , wherein at least one of the first end and second end is a flange having a diameter greater than a diameter of the midbody.
12. The stent of claim 11 , further comprising one to three additional flanges situated between the end and the midbody.
13. The stent of claim 1 , further comprising a textured surface disposed over the entirety of the tubular body or a designated portion thereof.
14. The stent of claim 13 , wherein the textured surface is a micropatterned surface.
15. The stent of claim 13 , wherein the designated portion thereof is selected from the helical thread or the interthread space.
16. A stent comprising:
a tubular body having a longitudinal axis, a midbody extending between a first end and a second end, and a helical thread circumferentially arranged on an outer surface of the midbody, wherein the helical thread comprises a plurality of turns and an interthread space, and wherein the helical thread has a cross-sectional profile shape comprising a buttress shape comprising:
a thrust face oriented at a first angle from perpendicular to the longitudinal axis, and
a bracing face oriented at a second angle from perpendicular to the longitudinal axis, where the second angle is greater than the first angle.
17. The stent of claim 16 , wherein the interthread space has a constant length.
18. The stent of claim 16 , wherein the interthread space has a length that varies.
19. The stent of claim 16 , wherein the helical thread extends onto at least one of the first end and second end.
20. The stent of claim 16 , wherein at least one of the first end and second end is a flange having a diameter greater than a diameter of the midbody.