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CN-122003218-A - Stent with struts defining circumferentially offset apices

CN122003218ACN 122003218 ACN122003218 ACN 122003218ACN-122003218-A

Abstract

A stent includes a plurality of cell grids. Within each cell grid, a first set of struts defines a first plurality of vertices and a second set of struts defines a second plurality of vertices, wherein a first strut and a second strut in the first set of struts define a first vertex having a first vertex angle and a second strut and a third strut in the first set of struts define a second vertex having a different second vertex angle. Within each cell grid, a fourth strut and a fifth strut in the second set of struts define a third vertex having a first vertex angle, and the fifth strut and the sixth strut define a fourth vertex having a second vertex angle. Each vertex of the first plurality of vertices is circumferentially offset from another vertex of the second plurality of vertices.

Inventors

  • LIU ZIANG
  • R. Marey
  • A.R. Nagswaran
  • WANG YIHAN
  • GUO XIAOJING
  • ZENG CHAO
  • LIU FENGYANG
  • E.Y.Wang

Assignees

  • 柯惠有限合伙公司

Dates

Publication Date
20260508
Application Date
20231026

Claims (15)

  1. 1. A stent, the stent comprising: A plurality of rows of struts extending along a longitudinal axis, each row of struts of the plurality of rows of struts extending about the longitudinal axis, and A plurality of rows of connectors, each of the plurality of connectors extending between longitudinally adjacent rows of struts, Wherein the rows of struts and the rows of connectors define a plurality of cell grids, Wherein each cell grid is defined by: a first set of struts in a first row of the plurality of rows of struts, A second set of struts in a second row of the plurality of rows of struts, and Two circumferentially adjacent connectors of one of the plurality of rows, the one row of connectors being located along the longitudinal axis between the first row of struts and the second row of struts, Wherein within each cell grid, the first set of struts defines a first plurality of vertices and the second set of struts defines a second plurality of vertices, Wherein within each cell grid, a first strut and a second strut of the first set of struts define a first vertex having a first vertex angle, and the second strut and a third strut of the first set of struts define a second vertex having a second vertex angle, the second vertex angle being less than the first vertex angle, and Wherein within each cell grid, a fourth strut and a fifth strut of the second set of struts define a third vertex having the first vertex angle, and the fifth strut and a sixth strut define a fourth vertex having the second vertex angle.
  2. 2. The stent of claim 1, wherein the stent is configured to be compressed along the longitudinal axis, wherein a longitudinal distance between longitudinally adjacent rows of struts is reduced when the stent is in a compressed configuration, and wherein the second apex angle is less than the first apex angle to reduce contact between the first plurality of apices and the second plurality of apices when the stent is in the compressed configuration.
  3. 3. The stent according to any one of claim 1 and 2, Wherein each cell grid extends around the longitudinal axis from a first end to a second end, Wherein a first connector of the two circumferentially adjacent connectors defines the first end, Wherein a second connector of the two circumferentially adjacent connectors defines the second end, Wherein the first stay is connected to the first connector, and Wherein the fourth stay is connected to the second connector.
  4. 4. A rack as claimed in any one of claims 1 to 3, wherein each connector of the rows of connectors extends parallel to the longitudinal axis.
  5. 5. The stent according to any one of claim 1 to 4, Wherein for each cell grid, the first plurality of vertices includes a first plurality of peaks extending toward a distal end of the stent and a first plurality of valleys extending toward a proximal end of the stent, Wherein for each cell grid, the second plurality of vertices includes a second plurality of peaks extending toward the distal end of the stent and a second plurality of valleys extending toward the proximal end of the stent, an Wherein for each cell grid, the second vertex angle is less than the first vertex angle to circumferentially offset each peak of the first plurality of peaks from each valley of the second plurality of valleys and to circumferentially offset each valley of the first plurality of valleys from each peak of the second plurality of peaks.
  6. 6. A stent according to claim 5, Wherein each peak of the first plurality of peaks is defined by a peak angle, wherein each valley of the first plurality of valleys is defined by a valley angle, Wherein a peak angle of at least one peak of the first plurality of peaks is equal to the first apex angle, Wherein the peak angle of the remaining number of the first plurality of peaks is equal to the second apex angle, Wherein a valley angle of at least one valley of the first plurality of valleys is equal to the first top angle, and Wherein a valley angle of a remaining number of the first plurality of valleys is equal to the second top angle.
  7. 7. The bracket of any one of claims 1 to 6, wherein the first apex angle is less than or equal to 90 degrees.
  8. 8. The bracket of any one of claims 1 to 7, wherein a difference between the first apex angle and the second apex angle is less than or equal to 20 degrees.
  9. 9. The stent of any one of claims 1-8, wherein each row of struts in the plurality of rows of struts is centrosymmetric about the longitudinal axis.
  10. 10. The bracket of claim 9, wherein each of the rows of connectors is centrally symmetric about the longitudinal axis.
  11. 11. The stent of any one of claims 1 to 10, wherein the stent is formed via laser cutting.
  12. 12. The stent of any one of claims 1-11, wherein the rows of struts define a helical pattern along the longitudinal axis from a distal end of the stent to a proximal end of the stent.
  13. 13. The stent of any one of claims 1 to 12, wherein one or more of the rows of struts each define a helical pattern extending along and about the longitudinal axis.
  14. 14. The stent of any one of claims 12 and 13, wherein within one or more of the rows of struts, the struts within the one or more rows define a varying longitudinal length along a longitudinal axis.
  15. 15. The stent of any one of claims 1-14, wherein each vertex of the first plurality of vertices is longitudinally offset and circumferentially offset from each vertex of the second plurality of vertices.

Description

Stent with struts defining circumferentially offset apices Technical Field The present disclosure relates to a medical stent. Background Stents are widely used in many medical applications where the stent is placed in a body lumen of a patient and expanded. Stents may be used in the coronary arteries or other vasculature of a patient, as well as other body lumens. Typically, the stent is a cylindrical member. The stent expands from a reduced diameter to an enlarged diameter. The stent may be self-expandable or balloon-expandable. At a target location within a body lumen of a patient, the stent is expanded to substantially maintain or expand the diameter of the body lumen at the target location. The stent may be both strong and flexible when placed in certain parts of the body. For example, a stent may be bent or held in a bent configuration when placed within the vasculature of a patient at or near the joint of the patient or at some curvature within a body lumen. Disclosure of Invention The stent may be formed from rows of struts. Adjacent rows of struts may be connected by rows of connectors. When the stent is radially expanded, the struts are juxtaposed with the surface of the body lumen, for example, to maintain or expand the diameter of the body lumen. Each row of struts may define a plurality of apices. The apices may facilitate the collapsing and expanding of the rows of struts as the stent transitions between collapsed and expanded configurations. The apex may be defined as a peak extending toward the distal end of the stent and a valley extending toward the proximal end of the stent. When the stent is placed in a body lumen of a patient with a curvature and/or is bent (e.g., in response to movement of the patient), a portion of the stent is compressed and another portion of the stent is expanded. When the stent is compressed, the peaks and valleys of the struts of adjacent rows may contact each other. For example, the peaks of a first row of struts may contact the valleys of a second row of struts when the stent is compressed. Contact between the peaks and valleys may cause the struts to protrude into the body lumen and/or interference between the peaks and valleys. The protrusions and interference may reduce the amount of apposition between the surfaces of the body lumen, which may affect fluid flow through the body lumen (e.g., due to the development of thrombosis within the body lumen). The present disclosure describes example devices, systems, and methods for increasing apposition of struts of a stent with a surface of a body lumen. Example stents described herein may include multiple rows of struts having circumferentially offset peaks and valleys. When the stent is compressed, the circumferential offset between the peaks and valleys reduces interference between struts of the stent in response to compression, for example, by extending the struts beyond each other rather than into each other. In some examples, the connectors of adjacent rows of struts and stents define a cell grid. Within each cell grid, the struts may define vertices having different vertices. The different vertex angles cause the peak sum Gu Zhouxiang within each cell grid to shift, e.g., without changing the boundaries of the cell grid. In some examples, multiple rows of struts may define a helical pattern along the longitudinal length of the stent, which may cause peaks and valleys of adjacent rows of struts to become circumferentially offset. The example devices, systems, and methods described in this disclosure may provide several advantages over other medical stents. Stents having the example strut patterns described herein may increase apposition of the stent with a patient's body lumen without compromising the flexibility and/or strength of the stent. The stents described herein may also increase apposition of the stent with the body lumen without causing the stent to experience increased torque during stent expansion, thereby simplifying the stent deployment process. In some examples, the present disclosure describes a stent comprising a plurality of rows of struts extending along a longitudinal axis, each of the plurality of rows of struts extending about the longitudinal axis, and a plurality of rows of connectors, each of the plurality of connectors extending between longitudinally adjacent rows of struts, wherein the plurality of rows of struts and the plurality of rows of connectors define a plurality of cell grids, wherein each cell grid is defined by a first set of struts of a first row of struts, a second set of struts of a second row of struts, and two circumferentially adjacent connectors of the plurality of rows of connectors, the first row of connectors being located along the longitudinal axis between the first row of struts and the second row of struts, wherein within each cell grid the first set of struts define a first plurality of apices and the second set of struts define a second plurality of apices