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Bioabsorbable polymer scaffold matrix as well as preparation method and application thereof

A technology for absorbing polymers and biology, applied in stents, prostheses, medicines and other directions, can solve the problems of increasing the processing and manufacturing costs of stent bases, complicated preparation process steps, and inability to resist blood flow scouring, and is conducive to large-scale The effect of the production and promotion of the drug, the improvement of the drug load, and the improvement of the supporting force

Active Publication Date: 2012-12-19
LEPU MEDICAL TECH (BEIJING) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main problems of the stent matrix prepared by the above method include: (1) The radial support force is too low to resist the blood flow in the human body, and it is easy to cause poor adherence of the stent or collapse of the stent wire, that is, it is unsafe to use (2) Due to the particularity of interventional therapy, it is difficult to deliver the stent to the narrow lesion, which is not practical
[0005] In addition, the preparation process of the above method is complicated and requires high-precision processing and manufacturing equipment, which in turn increases the processing and manufacturing cost of the bracket base, which does not conform to the principle of economic benefits

Method used

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  • Bioabsorbable polymer scaffold matrix as well as preparation method and application thereof
  • Bioabsorbable polymer scaffold matrix as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0059] (1) Extrude L-polylactic acid with an intrinsic viscosity of 5.0dl / g into a pipe with an outer diameter of 4.0mm and a wall thickness of 0.5mm, and use a laser engraving method to carve the pipe into a stent structure.

[0060] (2) Surface treatment of the engraved stent structure: using a laser etching method to drill holes on the surface of the polymer stent structure. The size of the holes is 20 microns in diameter and 20 microns in depth to obtain a non-surface-activated stent matrix.

Embodiment 2

[0062] (1) Form a polylactic acid-glycolic acid copolymer (polylactic acid: glycolic acid = 85:15) with an intrinsic viscosity of 2.00dl / g into a pipe with an outer diameter of 3.0mm and a wall thickness of 0.3mm with an extruder, and engrave it with a laser The method carves the tubing into a scaffolding structure.

[0063] (2) Carry out surface treatment to the engraved support structure: use chemical corrosion method to place holes on the surface of the polymer support structure, that is, immerse the support structure in a concentrated sulfuric acid solution with a concentration of 98%, and use ultrasonic oscillation with an oscillation frequency of 30kHz. After 10 minutes, holes are placed on the surface of the support structure. The size distribution range of the pores is 1-50 microns in diameter and 1-50 microns in depth, so as to obtain a non-surface-activated support matrix.

Embodiment 3

[0065] (1) Extrude the polylactic acid-caprolactone copolymer (polylactic acid:polycaprolactone=50:50) with an intrinsic viscosity of 2.0dl / g with an extruder to form an outer diameter of 2.0mm and a wall thickness of 0.5mm. Tubing, the tubing is engraved into a stent structure by laser engraving.

[0066] (2) Surface treatment of the engraved support structure: use a pinhole processing method to punch holes on the surface of the polymer support structure, the diameter of the punching pin is 30 microns, and the size of the surface holes obtained is 30 microns in diameter and 30 microns in depth non-surface-activated scaffold matrix.

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Abstract

The invention discloses a bioabsorbable polymer scaffold matrix. The scaffold matrix is formed via a method shown as follows: processing a bioabsorbable polymer tube through laser to form a scaffold structure in a graving manner; forming holes on the surface of the graved scaffold, so as to achieve high-density holes at a micron level on the surface; and then activating the surface through plasma. The scaffold matrix can be used for carrying medicine, thus, the scaffold matrix can be prepared into the bioabsorbable polymer medicine bearing scaffold. Compared with the prior art, the scaffold matrix has higher scaffolding force, and smaller outside diameter, therefore, the conveying performance of the scaffold in the blood vessel of a human body can be improved;, and the scaffold can easily pass through narrow diseased tissue; and the bioabsorbable polymer scaffold matrix has the advantages of safety, efficiency and practicability. The invention also discloses a preparation method of the scaffold matrix. The preparation method has the characteristics of simple technology, and reduced cost.

Description

technical field [0001] The invention relates to a polymer material medical device for percutaneous interventional therapy, in particular to a bioabsorbable polymer bracket matrix, its preparation method and application. Background technique [0002] The field of percutaneous interventional therapy has made remarkable achievements since it was pioneered in the 1970s, from initial balloon expansion interventional therapy to subsequent stent implantation. Among them, the drug-loaded stents used in stent implantation have developed from bare metal stents to drug-eluting stents based on stainless steel, cobalt-chromium alloy, and platinum-chromium alloy, and then gradually appeared carrier-free drug-eluting stents, Degradable drug-carrier-coated drug-eluting stents are the mainstream second-generation drug-eluting stents, and people are moving towards safer and more effective treatments step by step. Until today, the technology of the second generation of drug-eluting stents has...

Claims

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Application Information

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IPC IPC(8): A61F2/82A61M31/00A61L27/18A61L27/54
Inventor 赵昆李畅端木正张艳龙杨映红王洪建张正才蒲忠杰
Owner LEPU MEDICAL TECH (BEIJING) CO LTD
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