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Radial strengthening device and method for polylactic acid pipe

A strengthening device, polylactic acid technology, applied to tubular objects, other household appliances, household appliances, etc., can solve the problems of easy axial retraction, easy radial retraction, and inability to accurately control the wall thickness of the pipe, and achieve Accurate inner and outer diameters and good wall thickness uniformity

Active Publication Date: 2020-08-21
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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  • Radial strengthening device and method for polylactic acid pipe
  • Radial strengthening device and method for polylactic acid pipe
  • Radial strengthening device and method for polylactic acid pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 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

[0031] 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

[0033] 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 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 ...

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Abstract

The invention discloses a radial strengthening device and method for a polylactic acid pipe, and relates to the field of medical equipment. The device comprises a tubular mold, rotating blades and distal blades; rotating shafts of the rotating blades are arranged in the axis position of the tubular mold; and ends of the distal blades are movably connected with the rotating blades, and the other ends are controlled by control rods to be opened and closed. The strengthening method comprises the following steps of putting the polylactic acid pipe to be strengthened into the strengthening device and heating for a period of time; rotating the rotating blades in a constant direction, while slowing opening the distal blades slowly and gradually approaching the tubular mold, after a period of squeezing and scraping, slowly closing the distal blades to return to the initial state; and cooling to the room temperature, taking out the strengthened polylactic acid pipe and cutting off excess sections. The pipes strengthened by the strengthening device and method has better wall thickness uniformity, more precise inner and outer diameter dimensions, and no axial orientation, so that no radial and axial shrinkage is caused, and no thermal creep in the low temperature range (body temperature, etc.) is generated.

Description

technical field [0001] The invention relates to the field of medical equipment, in particular to a radial strengthening device and method for polylactic acid pipes. 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 radial 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 radial direction and the axial direction, so that the...

Claims

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Application Information

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Patent Type & Authority Applications(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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