A kind of biodegradable intravascular stent and its manufacturing method
A manufacturing method and technology for an inner stent, applied in directions such as stents, can solve the problems of fracture and slippage of the bending point, low radial support force of the stent in the blood vessel, achieve a small axial shortening rate, solve the problem of brittle fracture, The effect of structural stabilization
Inactive Publication Date: 2015-12-30
DONGHUA UNIV
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Problems solved by technology
However, compared with metal monofilaments of the same fineness, the radial support force of biodegradable intravascular stents is low, and the monofilaments are hard and brittle, which is prone to breakage and slippage at bending points during the stent preparation process.
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[0029] like figure 2 Shown is a schematic diagram of the structure of the biodegradable intravascular stent, image 3 In its expanded view, the biodegradable intravascular stent includes an annular network structure composed of biodegradable fiber braided wires. The annular network structure is composed of multiple rows of wavy structures, and each row of wavy structures It consists of 6 V-shaped structural units, two adjacent rows of wavy structures are arranged symmetrically, and the middle end point of each V-shaped structural unit (the first V-shaped structural unit 1) is symmetrical to the V-shaped structure in the adjacent row The terminal points in the middle of the unit (the second V-shaped structural unit 2 ) are connected once every two non-joint points 4 to form a joint point 3 . like Figure 4 As shown, the connection mode of the joint point 3 is braided wire cross connection, and at the joint point 3, the braided wire in one row is arranged in the gap of the br...
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The invention provides a biodegradable intravascular stent and a production method thereof. The biodegradable intravascular stent is characterized in that the biodegradable intravascular stent comprises an annular net structure made of biodegradable fiber braided threads; the annular net structure is composed of a plurality of rows of wavy structures; each row of wavy structure is composed of a plurality of V-shaped structure units; every two rows of wavy structures are parallel to each other; the endpoint in the middle of each V-shaped structure unit is connected with the endpoint in the middle of the symmetrical V-shaped structure unit in the adjacent row once every other two non-joint points to form a joint point. The biodegradable intravascular stent low in axial shortening rate can radially deform greatly due to the annular net structure, and the V-shaped structure units of two adjacent rows are connected once every other two non-joint points, so that the length of the stent is not changed greatly under the condition of great change of radial diameter of the stent, and the intravascular stent can be implanted conveniently by means of a conveyor.
Description
technical field [0001] The invention belongs to the field of intravascular stents and preparation thereof, in particular to a biodegradable intravascular stent and a manufacturing method thereof. Background technique [0002] At present, intravascular metal stents have been widely used in the treatment of various vascular stenotic lesions, and great improvements have been made in the selection of metal materials, types of stents, and manufacturing techniques. However, the histocompatibility and hemocompatibility of the bare metal stent are poor, and the placement of the stent will cause late thrombus, resulting in restenosis, and the residual metal ions will cause harm to the human body, etc., and the long-term therapeutic effect is not optimistic. [0003] The biodegradable intravascular stent has good biocompatibility and can avoid late intimal proliferation. After completing the mechanical support in the human body, it will be completely degraded into small molecular subs...
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IPC IPC(8): A61F2/90
Inventor张佩华王聪儿杨庆朱蕾郯志清吕志前姜晓彤王巧依
OwnerDONGHUA UNIV