Dual-Layer Lumen Stent
A double-layer lumen stent ( 100 ) includes a main body lumen stent ( 10 ) and an outer-layer skirt stent ( 20 ) surrounding an outer wall of the main body lumen stent ( 10 ); the outer-layer skirt stent ( 20 ) includes a support structure ( 21 ) and a cover layer ( 22 ) arranged on the support structure ( 21 ); one end of the outer-layer skirt stent ( 20 ) is connected to the outer wall of the main body lumen stent ( 10 ); the other end of the outer-layer skirt stent ( 20 ) is an opening structure ( 24 ) composed of the support structure ( 21 ); and the cover layer ( 22 ) is formed into an oblique cut shape at an edge of the opening structure ( 24 ). In the double-layer lumen stent ( 100 ), when a clinician releases the double-layer lumen stent ( 100 ) at a human tissue such as a vessel through a delivery device, constraint from the cover layer ( 22 ) to the opening structure ( 24 ) of the outer-layer skirt stent ( 20 ) can be reduced, and the adhesion between the cover layer ( 22 ) at the opening structure ( 24 ) on the outer-layer skirt stent ( 20 ) and the main body lumen stent ( 10 ) is reduced, thereby reducing release resistance to the outer-layer skirt stent ( 20 ) during the release process of the double-layer lumen stent ( 100 ).
1 . A double-layer lumen stent, comprising a main body lumen stent and an outer-layer skirt stent surrounding an outer wall of the main body lumen stent, the outer-layer skirt stent comprising a support structure and a cover layer arranged on the support structure, characterized in that one end of the outer-layer skirt stent is connected to the outer wall of the main body lumen stent; the other end of the outer-layer skirt stent is an opening structure composed of the support structure; and the cover layer is formed into an oblique cut shape at an edge of the opening structure.
2 . The double-layer lumen stent according to claim 1 , characterized in that the support structure comprises corrugated metal bars distributed in a circumferential direction, and the plurality of corrugated metal bars are distributed in an axial direction to form a barrel-shaped structure.
3 . The double-layer lumen stent according to claim 2 , characterized in that the corrugated metal bar at the edge of the opening structure has a plurality of waveform structures distributed in a circumferential direction, and a plurality of axial sizes of the plurality of waveform structures gradually increase in the circumferential direction; and the plurality of waveform structures are formed into oblique cut shapes at the edge of the opening structure.
4 . The double-layer lumen stent according to claim 2 , characterized in that the corrugated metal bar at the edge of the opening structure has a plurality of waveform structures distributed in a circumferential direction, and a plurality of axial sizes of the plurality of waveform structures are the same; the cover layer is covered on the plurality of waveform structures; and a plurality of axial sizes of the cover layer on the plurality of waveform structures gradually decrease in the circumferential direction.
5 . The double-layer lumen stent according to claim 2 , characterized in that the corrugated metal bar at the edge of the opening structure has a plurality of waveform structures distributed in a circumferential direction, and no cover layer is arranged in a gap between every two adjacent waveforms in the plurality of waveform structures.
6 . The double-layer lumen stent according to claim 5 , characterized in that the number of wave crests of the corrugated metal bar is 2n+5, where n is a natural number.
7 . The double-layer lumen stent according to claim 2 , characterized in that the corrugated metal bar at the edge of the opening structure has a plurality of waveform structures distributed in a circumferential direction, and at least part of the plurality of waveform structures close to the edge of the opening structure is not provided with the cover layer.
8 . The double-layer lumen stent according to claim 2 , characterized in that the cover layer comprises a first inclined strip-type cover film arranged at the edge of the opening structure, and a plurality of first inclined strip-type cover films are distributed at intervals along the edge of the opening structure in the circumferential direction.
9 . The double-layer lumen stent according to claim 8 , characterized in that the cover layer comprises a second inclined strip-type cover film arranged at the edge of the opening structure, and a plurality of second inclined strip-type cover films are distributed at the edge of the opening structure at intervals in the circumferential direction; and the plurality of second inclined strip-type cover films and the plurality of first inclined strip-type cover films cross each other.
10 . The double-layer lumen stent according to claim 9 , characterized in that the corrugated metal bar at the edge of the opening structure has a plurality of waveform structures distributed in a circumferential direction, and two sides of each waveform structure are respectively provided with the first inclined strip-type cover film and the second inclined strip-type cover film.