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Device and method for circumferential strengthening of polylactic acid pipe

A strengthening device and polylactic acid technology, applied in the direction of tubular objects, household appliances, and other household appliances, can solve the problems of prone to radial retraction, tube wall thickness cannot be precisely controlled, and prone to axial retraction, etc., to achieve Achieve precise temperature control, precise inner and outer diameters, and good wall thickness uniformity

Active Publication Date: 2020-11-20
SHANGHAI BIO HEART BIOLOGICAL TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, this method belongs to the inflation method, and the wall thickness of the inflation-molded tube cannot be precisely controlled. Since the diameter of the tube expands from a small size, it is prone to radial retraction due to the influence of body temperature after implantation, and the tube is stretched in the axial direction. , after being implanted in the body, it is prone to axial retraction due to the influence of body temperature

Method used

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  • Device and method for circumferential strengthening of polylactic acid pipe
  • Device and method for circumferential strengthening of polylactic acid pipe
  • Device and method for circumferential strengthening of polylactic acid pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] like figure 1 , figure 2 and image 3 As shown, put the polylactic acid pipe 2 to be strengthened into the metal mold 1, the wall thickness of the polylactic acid pipe 2 is 50-100um, heat the metal mold 1 to exceed the vitrification initiation temperature T1 of the polylactic acid pipe, and keep it warm for 5 minutes; then rotate the blade 3. Drive the distal blade along the rotating shaft to rotate along the swing center of the distal blade and turn away from the end connected to the control rod. The speed is controlled between 1-20rpm, and the remote control rod 5 is used to control The end blade 4 is opened at a speed of 0.1° / min, gradually approaching the metal mold 1; when the distal blade 4 is opened more than 2°, the opening of the distal blade 4 is suspended, and the temperature is raised to the end temperature T2 of vitrification of the polylactic acid tube. After reaching the temperature, the rotating speed is controlled at 20-60rpm, and the distal blade 4 ...

Embodiment 2

[0037] like figure 1 , figure 2 and image 3 As shown, put the polylactic acid pipe 2 to be strengthened into the metal mold 1, the wall thickness of the polylactic acid pipe 2 is 150-200um, heat the metal mold 1 to exceed the vitrification initiation temperature T1 of the polylactic acid pipe, and keep it warm for 20 minutes; then rotate the blade 3. Drive the distal blade along the rotating shaft to rotate along the swing center of the distal blade and turn away from the end connected to the control rod. The speed is controlled between 1-20rpm, and the remote control rod 5 is used to control The end blade 4 is opened at a speed of 0.1° / min, gradually approaching the metal mold 1; when the distal blade 4 is opened more than 2°, the opening of the distal blade 4 is suspended, and the temperature is raised to the end temperature T2 of vitrification of the polylactic acid tube. After reaching the temperature, the rotating speed is controlled at 20-60rpm, and the distal blade ...

Embodiment 3

[0039] like figure 1 , figure 2 and image 3As shown, put the polylactic acid pipe 2 to be strengthened into the metal mold 1, the wall thickness of the polylactic acid pipe 2 is 300-500um, heat the metal mold 1 to exceed the vitrification initiation temperature T1 of the polylactic acid pipe, and keep it warm for 30 minutes; then rotate the blade 3. Drive the distal blade along the rotating shaft to rotate along the swing center of the distal blade and turn away from the end connected to the control rod. The speed is controlled between 1-20rpm, and the remote control rod 5 is used to control The end blade 4 is opened at a speed of 0.1° / min, gradually approaching the metal mold 1; when the distal blade 4 is opened more than 2°, the opening of the distal blade 4 is suspended, and the temperature is raised to the end temperature T2 of vitrification of the polylactic acid tube. After reaching the temperature, the rotating speed is controlled at 20-60rpm, and the distal blade 4...

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Abstract

The invention discloses a polylactic acid pipe circumferential strengthening device and method, which relate to the field of medical equipment. The device includes a tubular mold, a rotating blade and a distal blade. One end is articulated with the rotating blade, and the other end is opened and closed by a lever. The strengthening method is to put the polylactic acid tube to be strengthened into the strengthening device and heat it for a period of time; the rotating blade rotates in a constant direction, while the distal blade slowly opens and gradually approaches the tubular mold, after a period of extrusion and scraping After wiping, the distal blades were slowly closed and returned to the original state; after cooling down to room temperature, the strengthened polylactic acid tubing was taken out and the redundant segment was cut off. The pipe strengthened by the strengthening device and method of the present invention has better wall thickness uniformity, more accurate inner and outer diameters, no axial orientation, thus no radial and axial retraction, and no thermal creep in the low temperature range (body temperature, etc.) Change.

Description

technical field [0001] The invention relates to the field of medical equipment, in particular to a circumferential strengthening device and method for a polylactic acid pipe. Background technique [0002] Biodegradable stents have become a possible alternative to traditional metal stents because they will degrade in the human environment and be absorbed and metabolized by the body. However, biological scaffolds have the problems of poor support and toughness. In order to solve this problem, the Chinese patent document CN201711213237.8 discloses a preparation method of polylactic acid and its copolymer scaffold. The original pipe is put into a tubular mold and heated, and high-pressure gas is injected into the original pipe to make the pipe The circumferential direction can achieve a high degree of orientation, and the pipe is also stretched axially along the axial direction of the pipe to achieve simultaneous orientation of the pipe in the circumferential direction and the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C71/02B29C71/00B29L23/00
CPCB29C71/02B29C71/0072B29L2023/00B29K2067/046A61L31/148A61F2/04A61F2/82A61F2240/001A61L31/06C08L67/04B29C2071/027
Inventor 汪立张晨朝蔡涛王君毅
Owner SHANGHAI BIO HEART BIOLOGICAL TECHNOLOGY CO LTD
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