Stent
An illustrative stent may comprise an elongated tubular member having a first end and a second end and an intermediate region disposed therebetween. The elongated tubular member configured to move between a collapsed configuration and an expanded configuration. The elongated tubular member may comprise at least one twisted filament, such as a knitted filament having a plurality of twisted knit stitches with intermediate rung portions extending between adjacent twisted knit stitches, or a plurality of helical filaments twisted with a plurality of longitudinal filaments.
1. A stent, the stent comprising:
an elongated tubular member comprising a single knitted filament having a plurality of twisted knit stitches with intermediate rung portions extending between adjacent twisted knit stitches, the elongated tubular member configured to move between a collapsed configuration and an expanded configuration;
wherein the plurality of twisted knit stitches each include a loop portion and an overlapping base region;
wherein in the collapsed configuration the intermediate rung portions have a first length and in the expanded configuration the intermediate rung portions have a second length greater than the first length.
2. The stent of claim 1 , wherein at least some of the plurality of twisted knit stitches are each suspended from a twisted knit stitch in a preceding row.
3. The stent of claim 1 , wherein at least some of the plurality of twisted knit stitches are each suspended from an intermediate rung portion of a preceding row.
4. The stent of claim 1 , wherein the elongated tubular member includes a first portion having a first knit pattern and a second portion having a second knit pattern different from the first knit pattern.
5. The stent of claim 4 , wherein the second portion is formed of one or more rows of the knitted filament having the plurality of twisted knit stitches.
6. The stent of claim 5 , wherein the first portion is formed of one or more rows of the knitted filament having a stockinette stitch pattern.
7. A stent, the stent comprising:
an elongated tubular member comprising a knitted filament, the elongated tubular member configured to move between a collapsed configuration and an expanded configuration;
wherein the elongated tubular member includes a first portion having a first knit pattern and a second portion having a second knit pattern different from the first knit pattern;
wherein the second portion is formed of one or more rows of the knitted filament having a plurality of twisted knit stitches with intermediate rung portions extending between adjacent twisted knit stitches, wherein the plurality of twisted knit stitches each include a loop portion and an overlapping base region;
wherein in the collapsed configuration the plurality of twisted knit stitches have a first profile and in the expanded configuration the plurality of twisted knit stitches have a second profile different from the first profile.
8. The stent of claim 7 , wherein the second portion has a lower radial force in the expanded configuration than the first portion.
9. The stent of claim 7 , wherein a length of the intermediate rung portions in the collapsed configuration is less than a length of the intermediate rung portions in the expanded configuration.
10. The stent of claim 7 , wherein at least some of the plurality of twisted knit stitches are each suspended from a twisted knit stitch in a preceding row.
11. The stent of claim 7 , wherein the first portion is formed of one or more rows of the knitted filament having a stockinette stitch pattern.
12. The stent of claim 7 , wherein the elongate tubular member is formed from a single filament interwoven with itself.
13. A stent, the stent comprising:
an elongated tubular member comprising a knitted filament, the elongated tubular member configured to move between a collapsed configuration and an expanded configuration;
wherein the elongated tubular member includes a first portion having a first knit pattern and a second portion having a second knit pattern different from the first knit pattern;
wherein the first portion is formed of one or more rows of the knitted filament having a plurality of open loops with intermediate rung portions extending between adjacent open loops;
wherein the second portion is formed of one or more rows of the knitted filament having a plurality of twisted knit stitches with intermediate rung portions extending between adjacent twisted knit stitches;
wherein a length of the intermediate rung portions of the second portion in the collapsed configuration is less than a length of the intermediate rung portions of the second portion in the expanded configuration.
14. The stent of claim 13 , wherein at least some of the plurality of twisted knit stitches are each suspended from a twisted knit stitch in a preceding row.
15. The stent of claim 13 , wherein the plurality of twisted knit stitches each include a loop portion and an overlapping base region.