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Novel balloon expandable stent conveying system

A delivery system and a new type of technology, applied in the field of medical devices, to achieve the effects of cost saving, simple structure and simple processing

Active Publication Date: 2012-11-28
吕文峰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The technical problem to be solved by the present invention is to provide a novel stent delivery system based on a balloon catheter, which overcomes the defects of the existing balloon catheter

Method used

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  • Novel balloon expandable stent conveying system
  • Novel balloon expandable stent conveying system
  • Novel balloon expandable stent conveying system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Such as image 3 , Figure 4 As shown, the present invention is a novel stent delivery system in which the stent is preloaded on the outer tube at the distal end of the balloon catheter. 5 and hypotubes. The inner tube 3 runs through the lumen of the distal outer tube 4 and the lumen of the bulb 2. The inner diameters of the soft tip 1 and the inner tube 3 are consistent, and the proximal end 11 of the soft tip 1 and the farthest end 32 of the inner tube 3 are butt-welded together. The combination of the soft head 1 and the inner tube 3 is put into the distal neck 22 of the ball 2 and welded together. And the farthest end 42 of the outer tube 4 of the far end is inserted into the proximal neck 21 of the ball 2 and welded together. The far and near ends of the inner tube 3 have heavy metal marks (developing rings) that are well developed by X-rays respectively, which are used to show the positions of the ball and the bracket. The traditional balloon expandable stent...

Embodiment 2

[0061] In this embodiment, a double-layer spherical structure is adopted, the outer layer is ePTFE with a thickness of 20 microns, and the inner layer is Nylon 12 with a thickness of 20 microns. Before use, the maximum outer diameter of the ball is 1.5 mm, and the outer diameter is 8.0 mm when fully filled to 6 atmospheres.

[0062] After use, the ball will be in a cylindrical shape with a maximum outer diameter of 1.9mm after being completely sucked, which is only slightly increased than before use. The measured burst pressure of the ball is 16 atmospheres.

[0063] The traditional single-layer Nylon 12 ball has a similar thickness (30 microns) and the same size material. Before use, the outer diameter of the folded ball is 1.7 mm, and the outer diameter is 8.0 mm when it is fully filled to 6 atmospheres. After use, the bulb becomes a flat flake-like structure after being completely vacuumed, with a maximum width of 7.5 mm, which is more than 4 times larger than the diameter...

Embodiment 3

[0067] In this embodiment, a double-layer spherical structure is adopted, the outer layer is ePTFE with a thickness of 20 microns, and the inner layer is PU with a thickness of 20 microns. Before use, the outer diameter of the ball is 1.6 mm, and when fully filled to 6 atmospheres, the outer diameter is 10.0 mm.

[0068] After use, the outer diameter of the ball is 2.0 mm, which is only slightly increased than before use.

[0069] The measured burst pressure of the ball is 12 atmospheres.

[0070] The traditional single-layer PU ball has the same total thickness (40 microns) and the same size material. Before use, the outer diameter of the folded ball is 1.7 mm, and the outer diameter is 10.0 mm when it is fully filled to 6 atmospheres. After use, the bulbs become flat flakes after being completely vacuumed, with an outer diameter of 4.8 mm, which is about 3 times larger than the diameter of the bulbs before use.

[0071] The measured burst pressure of the single-layer PU ma...

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Abstract

The invention discloses a novel balloon expandable stent conveying system which comprises a balloon, an inner tube, a far-end outer tube, a corrugated tube, a soft head and a stent pushing tube. The inner tube runs through an inner cavity of the far-end outer tube and an inner cavity of the balloon; a combination body of the soft head and the inner tube is placed and connected into the neck part of the far end of the balloon; the farthest end of the far-end outer tube is placed into the neck part of the near end of the balloon and is connected with the neck part of the near end of the balloon; the balloon is of a one-layer or multilayer structure; and at least one layer of the balloon is made of a material with a micropore structure. The stent conveying system disclosed by the invention has a simple structure, also has the functions of pre-expanding a narrow tube cavity and conveying a stent, has good operation and control performance and strong passing performance, is rapid and convenient to operate and is cost-saving. When adopting the ePTFE (expanded polytetrafluoroethylene) material with the micropore structure, the balloon does not need to be folded and is simple to process; and time of sucking liquid in the balloon is short, the blood supply of far-end blood vessels is high in recovery speed, the balloon is changed into a cylinder shape with a small diameter after the liquid is pumped out, and the blood vessels cannot be damaged or the stent shifting cannot be caused in the retracting process. The balloon with the double-layer structure has higher pressure resistance capacity.

Description

technical field [0001] The invention relates to a novel stent delivery system based on a spherical catheter, which belongs to the technical field of medical devices. Background technique [0002] There are two types of stents commonly used in cardiovascular and cerebrovascular interventions: balloon-expandable stents and self-expanding stents. In view of the fact that the expansion method of the ball can accurately locate and release the stent, most of the stents used in clinical practice are expanded stents. Every year, about 2 million sets of balloon expandable stents are used to treat various cardiovascular and cerebrovascular diseases. The balloon expansion stent is pre-pressed on a folded balloon with a specific diameter. In clinical use, the doctor pushes the balloon catheter carrying the stent to the narrow section of the blood vessel, and then injects liquid into the balloon lumen. Once fully inflated, the stent can be expanded to the desired diameter. After the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61F2/84A61L31/04A61L31/06A61L31/14
Inventor 吕文峰张翠欣魏诗荣
Owner 吕文峰
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