Covered stent and medical instrument assembly

By designing an inner and outer layer coating structure with different elongation, the inner diameter of the coating stent is adjusted, the impact of the coating stent on the liver when adjusting the diameter is solved, and the outer diameter changes are reduced when the inner diameter changes, protect the liver, and adapt to changes in blood flow.

CN120458773APending Publication Date: 2025-08-12ANHUI PROVINCIAL HOSPITAL
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Patent Information

Application Number
CN202510905458.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-01
Publication Date
2025-08-12

AI Technical Summary

Technical Problem

When the existing coated stent adjusts the diameter, both the inner diameter and the outer diameter change, resulting in the impact on the liver parenchyma. How to reduce the change in the outer diameter during the inner diameter change to reduce the impact on the liver.

Method used

A coating bracket is designed, and the elongation of the inner layer coating is greater than that of the outer layer coating. By injecting or extracting the medium into the adjustment cavity between the inner layer and the outer layer, the inner layer coating can be adjusted. The inner layer coating moves under the pressure of the medium while the outer layer coating is basically unchanged, protecting the liver parenchyma.

Benefits of technology

By adjusting the inner diameter, reducing damage to the liver, protecting the liver parenchyma, reducing the occurrence of complications, and adapting to different blood flow conditions.

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Abstract

The invention discloses a covered stent and a medical instrument assembly. The covered stent comprises a stent body, an outer-layer covering film and an inner-layer covering film. The stent is of a hollow structure and comprises a covered section and a bare section which are communicated with each other. The outer layer covering film is arranged in the circumferential direction of the outer side of the covering film section and extends in the axial direction of the covering film section. The inner-layer covering film is arranged in the circumferential direction of the inner side of the covering film section and extends in the axial direction of the covering film section; the end, close to the bare section, of the inner-layer covering film is connected with the end, close to the bare section, of the outer-layer covering film in a sealed mode, and an adjusting cavity with an opening is formed between the inner-layer covering film and the outer-layer covering film. And the ductility of the outer-layer covering film is smaller than that of the inner-layer covering film. By injecting and extracting a medium into and from the adjusting cavity, the inner-layer covering film can move under the influence of the pressure of the medium, and deformation of the outer-layer covering film is reduced. When the covered stent is applied to connection of portal veins and hepatic veins of the liver, in the deformation process of the inner-layer covering film, the outer-layer covering film can be basically unchanged, so that liver parenchyma can be protected to the maximum extent, and damage to the liver parenchyma is reduced.
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