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.
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 interthread space has a length of from about 2 mm to about 20 mm.
7 . The stent of claim 1 , 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 0.5 mm to about 5 mm, from about 1 mm to about 4 mm, or from about 2 mm to about 3 mm.
8 . The stent of claim 1 , wherein the helical thread has a cross-sectional profile shape selected from a circle, an ellipse, or a triangle.
9 . The stent of claim 8 , wherein the cross-sectional profile shape is an isosceles triangle.
10 . The stent of claim 9 8 , wherein a face of the isosceles triangle is oriented at an angle of from about 10 degrees to about 35 degrees from perpendicular to the longitudinal axis.
11 . The stent of claim 1 , wherein the helical thread extends onto at least one of the first end and second end.
12 . 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.
13 . The stent of claim 12 , further comprising one to three additional flanges situated between the end and the midbody.
14 . The stent of claim 1 , further comprising a textured surface disposed over the entirety of the tubular body or a designated portion thereof.
15 . The stent of claim 14 , wherein the textured surface is a micropatterned surface.
16 . The stent of claim 14 , wherein the designated portion thereof is selected from the helical thread and the interthread space.
17 . A stent assembly, comprising:
a stent comprising a midbody extending between a first end and a second end, and
a tubular sleeve surrounding a length of the midbody and comprising a helical thread circumferentially arranged on an outer surface of the sleeve.
18 . The stent assembly of claim 17 , wherein the sleeve is configured to allow movement of the stent relative to the sleeve.
19 . The stent assembly of claim 17 , wherein the sleeve is fixedly secured to the stent.
20 . The stent assembly of claim 17 , wherein the stent includes a cover and at least a portion of the sleeve does not include a cover.