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CN-224220292-U - Double-layer bracket and artificial vein valve

CN224220292UCN 224220292 UCN224220292 UCN 224220292UCN-224220292-U

Abstract

The application provides a double-layer bracket and a prosthetic venous valve, and relates to the technical field of prosthetic venous valves. The double-layer support comprises an outer support, an inner support arranged in the outer support and used for arranging valve leaflets, and one or more support connecting rods for connecting the outer support and the inner support, wherein a gap is reserved between the outer support and the inner support, and the minimum distance between the outer support and the inner support is larger than zero.

Inventors

  • CHEN JINGYU

Assignees

  • 苏州科易医疗科技有限公司

Dates

Publication Date
20260512
Application Date
20250116

Claims (15)

  1. 1. A double-layered stent for use in a prosthetic venous valve, comprising: The valve comprises an outer bracket, an inner bracket arranged in the outer bracket and used for arranging valve blades, and one or more bracket connecting rods for connecting the outer bracket and the inner bracket; And a gap is formed between the outer bracket and the inner bracket, and the minimum distance between the outer bracket and the inner bracket is larger than zero.
  2. 2. The dual layer stent of claim 1, wherein the inner stent comprises one or more leaflet fixation assemblies comprising two curved bars connected by a connection point; a gap is formed between the two curved rods and the outer bracket; The support connecting rod is connected with the connecting point of the curved rod, an external connecting point far away from the connecting point on the curved rod and/or the middle part of the curved rod.
  3. 3. The dual layer stent of claim 2, wherein the inner stent comprises two or more of the leaflet fixation assemblies; The inner bracket also comprises an auxiliary fixing component, wherein two ends of the auxiliary fixing component are respectively connected with curved bars of different valve leaf fixing components; The support connecting rod is connected with the auxiliary fixing assembly.
  4. 4. The double-layered stent according to claim 1, wherein a guide assembly for guiding the extension direction of the proliferation tissue is provided between the outer stent and the inner stent.
  5. 5. The double-layered stent according to claim 4, wherein the guiding member is provided with a coating for inhibiting tissue proliferation and/or inhibiting thrombosis.
  6. 6. The double-layered stent of claim 4, wherein the guide assembly is in the shape of a bar, the guide assembly comprising a first side and a second side, the first side being connected to an inner edge of the outer stent, the second side being connected to an outer edge of the inner stent; The guide component extends along the outer edge of the inner bracket and has a shape matched with the shape of the outer edge of the inner bracket; The outer support is externally connected to the first curved surface, and the first side edge of the guide assembly is located on the first curved surface.
  7. 7. The double-layered stent of claim 1, wherein the outer stent comprises a proximal support frame, a distal support frame, and a plurality of support rods connecting the proximal support frame and the distal support frame, wherein one or more of the support rods comprises a pocket-type support rod; The inner part of the proximal support frame, the inner part of the distal support frame and/or the plurality of support rods form a containing space for containing the inner support.
  8. 8. The double-layered stent of claim 3, wherein the outer stent comprises a proximal support frame, a distal support frame, and a plurality of support rods connecting the proximal support frame and the distal support frame, wherein one or more of the support rods comprises a pocket-type support rod; An accommodating space for accommodating the inner bracket is formed inside the proximal end support frame, inside the distal end support frame and/or among the plurality of support rods; The support connecting rods comprise a first support connecting rod connected with one ends of the distal end support frame and the curved rod, a second support connecting rod connected with the distal end support frame and the auxiliary fixing assembly, and/or a third support connecting rod connected with the proximal end support frame and the other end of the curved rod.
  9. 9. The double-layer bracket according to claim 3, wherein the outer bracket comprises an arc-shaped supporting frame and a release mechanism arranged at one end of the arc-shaped supporting frame; The inner part of the arc-shaped supporting frame forms an accommodating space for accommodating the inner bracket; The support connecting rod is connected with one end of the bent rod and the arc-shaped supporting frame, and/or the support connecting rod is connected with the middle part of the bent rod and the arc-shaped supporting frame.
  10. 10. The dual-layer stent of claim 9, wherein the stent connecting rod extends from the curved rod in a distal direction and is bent to form an arcuate foot structure, the arcuate foot structure further extending in a proximal direction and being connected to the arcuate support frame.
  11. 11. The double-layered stent of claim 1, wherein the stent connecting rod extends in a radial direction of the outer stent or an angle is formed between the stent connecting rod and a corresponding radial direction of the outer stent.
  12. 12. The double-layered support according to claim 1, wherein the outer support is circumscribed by a first curved surface, the inner support is inscribed by a second curved surface, and a gap is provided between the first curved surface and the second curved surface.
  13. 13. The double-layered stent of claim 1, wherein the outer stent comprises a plurality of outer stent bars connected to each other in a lattice shape; The cross-sectional area of the outer stent rod member of the outer stent is smaller than the cross-sectional area of the inner stent rod member of the inner stent.
  14. 14. The double-layered stent according to claim 1, wherein a coating film is provided on the inner side of the outer stent, and a coating film for inhibiting tissue proliferation and/or inhibiting thrombosis is provided on the coating film.
  15. 15. A prosthetic venous valve comprising the dual-layer stent of any one of claims 1 to 14, further comprising leaflets disposed on the inner stent.

Description

Double-layer bracket and artificial vein valve Technical Field The present disclosure relates to the field of prosthetic venous valves, and in particular, to a double-layered stent and a prosthetic venous valve. Background Prosthetic venous valves are used for lower limb venous disease and are generally composed of a stent and leaflets, the leaflets being secured to the stent. Because the stent of the artificial vein valve is attached to the inner wall of the vein, and a supporting force is applied to the inner wall of the vein to fix the valve, endothelial hyperplasia is easily caused. After the endothelium is thickened, the proliferation tissue climbs to the valve leaflet to thicken and rigidify the edge of the valve leaflet, and meanwhile, the proliferation tissue climbs to the valve leaflet is continuous with the vein endothelium, so that the movement of the valve leaflet is restrained, the closure of the valve leaflet is influenced, and the artificial vein valve is partially or completely failed. Disclosure of utility model One or more embodiments of the present disclosure provide a double-layered stent, which is applied to a prosthetic venous valve, can be applied to a lower limb prosthetic venous valve, can be applied to an environment with a valve size of less than 20mmm, can be applied to an environment with a valve size of 13mm-15mm, wherein the double-layered stent comprises an outer stent, an inner stent arranged inside the outer stent and used for arranging valve leaflets, and one or more stent connecting rods connecting the outer stent and the inner stent, wherein a gap is formed between the outer stent and the inner stent, and the minimum distance between the outer stent and the inner stent is greater than zero. In some embodiments, the inner stent comprises one or more leaflet retainer assemblies comprising two curved bars connected by a connection point, a gap between the two curved bars and the outer stent, the stent connection rod being connected to the connection point of the curved bars, an external end point on the curved bars remote from the connection point, and/or a middle portion of the curved bars. In some embodiments, the inner support comprises two or more than two leaflet fixing components, the inner support further comprises auxiliary fixing components, two ends of each auxiliary fixing component are respectively connected with curved rods of different leaflet fixing components, and the support connecting rod is connected with each auxiliary fixing component. In some embodiments, a guide assembly is disposed between the outer stent and the inner stent, the guide assembly for guiding the direction of extension of the proliferating tissue. In some embodiments, the guide assembly is provided with a suppression coating for inhibiting tissue proliferation and/or inhibiting thrombosis. In some embodiments, the guiding component is strip-shaped, the guiding component comprises a first side edge and a second side edge, the first side edge is connected with the inner edge of the outer support, the second side edge is connected with the outer edge of the inner support, the guiding component extends along the outer edge of the inner support and is matched with the outer edge of the inner support in shape, the outer support is externally connected with a first curved surface, and the first side edge of the guiding component is located on the first curved surface. In some embodiments, the outer support comprises a proximal support frame, a distal support frame and a plurality of support rods connecting the proximal support frame and the distal support frame, wherein one or more pocket-type support rods are arranged in the plurality of support rods, and a containing space for containing the inner support is formed in the proximal support frame, in the distal support frame and/or among the plurality of support rods. In some embodiments, the stent connecting rods include a first stent connecting rod connecting the distal support frame and one end of the curved rod, a second stent connecting rod connecting the distal support frame and the auxiliary fixation assembly, and/or a third stent connecting rod connecting the proximal support frame and the other end of the curved rod. In some embodiments, the outer bracket comprises an arc-shaped supporting frame and a release mechanism arranged at one end of the arc-shaped supporting frame, wherein a containing space for containing the inner bracket is formed inside the arc-shaped supporting frame, the bracket connecting rod is connected with one end of the curved rod and the arc-shaped supporting frame, and/or the bracket connecting rod is connected with the middle part of the curved rod and the arc-shaped supporting frame. In some embodiments, the bracket connecting rod extends from the curved rod towards the distal end and is bent to form an arc-shaped foot structure, and the arc-shaped foot structure further extends towards the proximal end and is