CN113385899A - Processing method of magnesium alloy thin-wall pipe for heart stent - Google Patents
Processing method of magnesium alloy thin-wall pipe for heart stent Download PDFInfo
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- CN113385899A CN113385899A CN202110725508.8A CN202110725508A CN113385899A CN 113385899 A CN113385899 A CN 113385899A CN 202110725508 A CN202110725508 A CN 202110725508A CN 113385899 A CN113385899 A CN 113385899A
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- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 28
- 238000003672 processing method Methods 0.000 title claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 26
- 238000010438 heat treatment Methods 0.000 claims abstract description 24
- 238000000137 annealing Methods 0.000 claims abstract description 16
- 230000008569 process Effects 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 238000003723 Smelting Methods 0.000 claims abstract description 7
- 238000005266 casting Methods 0.000 claims abstract description 6
- 238000004140 cleaning Methods 0.000 claims abstract description 6
- 238000005520 cutting process Methods 0.000 claims abstract description 6
- 238000001192 hot extrusion Methods 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 238000005498 polishing Methods 0.000 claims abstract description 6
- 239000002344 surface layer Substances 0.000 claims abstract description 6
- 238000002844 melting Methods 0.000 claims abstract description 5
- 230000008018 melting Effects 0.000 claims abstract description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 16
- 239000000956 alloy Substances 0.000 claims description 9
- 239000011575 calcium Substances 0.000 claims description 9
- 239000011777 magnesium Substances 0.000 claims description 9
- 239000011701 zinc Substances 0.000 claims description 9
- 229910052786 argon Inorganic materials 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 8
- 239000004519 grease Substances 0.000 claims description 8
- 229910052749 magnesium Inorganic materials 0.000 claims description 8
- 239000011572 manganese Substances 0.000 claims description 8
- 230000001681 protective effect Effects 0.000 claims description 8
- 229910045601 alloy Inorganic materials 0.000 claims description 7
- 229910052791 calcium Inorganic materials 0.000 claims description 6
- 229910052725 zinc Inorganic materials 0.000 claims description 6
- 229910052726 zirconium Inorganic materials 0.000 claims description 6
- 229910052787 antimony Inorganic materials 0.000 claims description 5
- 230000001050 lubricating effect Effects 0.000 claims description 5
- 229910052748 manganese Inorganic materials 0.000 claims description 5
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 4
- 238000010791 quenching Methods 0.000 claims description 4
- 230000000171 quenching effect Effects 0.000 claims description 4
- 238000011282 treatment Methods 0.000 claims description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 2
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 2
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 claims description 2
- 238000001125 extrusion Methods 0.000 claims description 2
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 2
- 150000002910 rare earth metals Chemical class 0.000 claims description 2
- 229910052727 yttrium Inorganic materials 0.000 claims description 2
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 claims description 2
- 230000000747 cardiac effect Effects 0.000 claims 1
- 238000002560 therapeutic procedure Methods 0.000 description 4
- 239000010775 animal oil Substances 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 235000015112 vegetable and seed oil Nutrition 0.000 description 3
- 239000008158 vegetable oil Substances 0.000 description 3
- 208000024172 Cardiovascular disease Diseases 0.000 description 2
- 208000007536 Thrombosis Diseases 0.000 description 2
- 201000010099 disease Diseases 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 230000002792 vascular Effects 0.000 description 2
- 206010048554 Endothelial dysfunction Diseases 0.000 description 1
- 208000031481 Pathologic Constriction Diseases 0.000 description 1
- 238000013176 antiplatelet therapy Methods 0.000 description 1
- 239000012620 biological material Substances 0.000 description 1
- 210000004204 blood vessel Anatomy 0.000 description 1
- 208000037976 chronic inflammation Diseases 0.000 description 1
- 230000006020 chronic inflammation Effects 0.000 description 1
- 238000007887 coronary angioplasty Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 235000005911 diet Nutrition 0.000 description 1
- 230000037213 diet Effects 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008694 endothelial dysfunction Effects 0.000 description 1
- 206010020718 hyperplasia Diseases 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229910001000 nickel titanium Inorganic materials 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 208000037803 restenosis Diseases 0.000 description 1
- 230000000250 revascularization Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 230000036262 stenosis Effects 0.000 description 1
- 208000037804 stenosis Diseases 0.000 description 1
- 238000001356 surgical procedure Methods 0.000 description 1
- 238000011277 treatment modality Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
Abstract
The invention discloses a processing method of a magnesium alloy thin-wall pipe for a heart stent, which comprises the following steps: performing melting, smelting and casting on the magnesium alloy to obtain a cast ingot, removing a surface layer containing impurities, performing hot extrusion to obtain a bar blank, and cutting and processing the bar blank in a segmented manner to obtain a pipe blank; extruding the pipe blank to obtain a seamless extruded pipe blank, and then performing stress relief annealing; polishing the inner wall and the outer wall of the pipe obtained in the step two, then cleaning the inner wall and the outer wall of the pipe, then carrying out heat treatment on the pipe to remove stress, and cooling after the heat treatment is finished; the magnesium alloy thin-wall pipe is formed by adopting gas protection smelting, mechanical processing, drawing and heat treatment. The process has the advantages of low cost, uniform wall thickness of the formed pipe, uniform structure and good mechanical property, and improves the quality and yield of the pipe.
Description
Technical Field
The invention relates to the field of processing of biological materials, in particular to a processing method of a magnesium alloy thin-wall tube for a heart stent.
Background
In recent years, with the improvement of living standard, the fat content of national diet is continuously increased, so that patients with cardiovascular diseases are more and more common. According to the statistical data prediction of the world health organization, the number of people with life risks caused by cardiovascular diseases in China can reach 400 ten thousand every year in 2020, and the threat of the disease to the health of people is large. For such diseases, the most effective treatment modality is percutaneous transluminal coronary angioplasty. The interventional therapy technology starts in the last 70 th century, and has been developed into the most common treatment mode due to the characteristics of small wound, quick response, low mortality and the like.
In the interventional therapy process, the implanted stent is the core of the whole technology, and the quality of the stent directly determines the effect of the interventional therapy. . At present, the blood vessel stent applied clinically takes stainless steel and NiTi alloy as main preparation materials. These vascular stents have intimal hyperplasia during treatment, with more than about 20% of the occurrences of vascular restenosis and thrombosis; chronic inflammation and antiplatelet therapy are long, and long-term medication is needed; the surgery revascularization operation (secondary operation) can not be carried out when an accident occurs; long-term endothelial dysfunction; the subsequent monitoring is difficult, and MRI cannot be used. In view of the existing defects, researchers find that magnesium alloy is considered as the best candidate material of a novel degradable and absorbable stent, and has important significance for solving the risks of secondary stenosis and long-term thrombosis generated by stent interventional therapy. But the magnesium alloy has lower plastic deformation capability and is easy to generate microcracks, the processing difficulty of the material pipe is increased, and the quality and the yield of the pipe are influenced.
Disclosure of Invention
In view of this, the embodiment of the invention provides a method for processing a magnesium alloy thin-wall tube for a heart stent, which solves the problems of high processing difficulty, low tube quality and yield and the like of the tube in the prior art.
The embodiment of the invention discloses a processing method of a magnesium alloy thin-wall pipe for a heart stent, which comprises the following steps:
the method comprises the following steps: performing melting, smelting and casting on the magnesium alloy to obtain a cast ingot, removing a surface layer containing impurities, performing hot extrusion to obtain a bar blank, and cutting and processing the bar blank in a segmented manner to obtain a pipe blank;
step two: extruding the pipe blank to obtain a seamless extruded pipe blank, and then performing stress relief annealing;
step three: polishing the inner wall and the outer wall of the pipe obtained in the step two, then cleaning the inner wall and the outer wall of the pipe, then carrying out heat treatment on the pipe to remove stress, and cooling after the heat treatment is finished;
step four: the method comprises the steps of processing the pipe by using a hydraulic pipe drawing machine, heating the pipe to 400-500 ℃ before drawing, lubricating the pipe by using grease in each drawing process, drawing in multiple passes, and drawing in multiple passes by using argon as protective gas during annealing to finally form the thin-walled pipe.
Further, in the second step, the tube blank is heated to 380-450 ℃ before the extrusion.
Further, the heat treatment adopts a pre-cooling quenching mode, and compressed air is used for cooling after quenching.
Further, seven alloy elements of yttrium Y, mixed rare earth RE, calcium Ca, manganese Mn, antimony Sb, zinc Zn and zirconium Zr are added into magnesium, and the mass percentage of each alloy element in the magnesium alloy material is as follows: y1-4%, RE 0.1-1%, Ca 0.01-1%, Zn 0.1-1%, Mn 0.1-1.7%, Sb 0.1-1%, Zr 0.1-1%, Mg 89.3-98.2%; after adding alloy elements into pure magnesium, the magnesium alloy is smelted.
Further, the pipes are subjected to stress relief treatment in a vacuum atmosphere.
Further, in the fourth step, when the diameter of the pipe is greater than or equal to 3.5mm, the drawing deformation rate is 3-5 mm/s, and when the diameter of the pipe is less than 3.5mm, the drawing deformation rate is 2-3 mm/s.
Further, in the fourth step, when the diameter of the pipe is greater than or equal to 3.5mm, the deformation of each pass is 10-12%, when the diameter of the pipe is less than 3.5mm, the deformation of each pass is 6-9%, and the annealing times after drawing are less than the times of the passes.
The invention overcomes the limitation of the existing forming process of magnesium alloy, and adopts a series of processes of gas-shielded melting, machining, drawing and heat treatment to form the magnesium alloy thin-wall pipe for the heart stent. The process has the advantages of low cost, uniform wall thickness of the formed pipe, uniform structure and good mechanical property, and improves the quality and yield of the pipe.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The embodiment of the invention discloses a processing method of a magnesium alloy thin-wall pipe for a heart stent, which comprises the following steps:
the method comprises the following steps: the weight percentages are as follows: the method comprises the following steps of mixing raw materials of Y1%, RE 0.5%, Ca 0.3%, Zn 0.5%, Mn1.1%, Sb 0.8%, Zr 0.6% and Mg 95.2%, performing melt smelting and casting to obtain a cast ingot, removing a surface layer containing impurities, performing hot extrusion to obtain a bar blank, and cutting and processing the bar blank in a segmented manner to obtain a pipe rough blank;
step two: heating the pipe to 420 ℃, extruding the rough pipe blank to obtain a seamless extruded pipe blank, and then performing stress relief annealing in a vacuum atmosphere in an environment with argon as a protective gas;
step three: polishing the inner wall and the outer wall of the pipe obtained in the step two, then cleaning the inner wall and the outer wall of the pipe, then carrying out heat treatment on the pipe to remove stress, and cooling after the heat treatment is finished;
step four: the method comprises the steps of processing the pipe by using a hydraulic pipe drawing machine, heating the pipe to 420 ℃ before drawing, lubricating the pipe by using grease in each drawing process, wherein the grease can be vegetable oil or animal oil, drawing is carried out in multiple passes, argon is used as protective gas during annealing, and the thin-walled pipe is finally formed through the multiple-pass drawing.
When the diameter of the pipe is larger than or equal to 3.5mm, the drawing deformation rate is 3-5 mm/s, and when the diameter of the pipe is smaller than 3.5mm, the drawing deformation rate is 2-3 mm/s. When the diameter of the pipe is larger than or equal to 3.5mm, the deformation of each pass is 10-12%, when the diameter of the pipe is smaller than 3.5mm, the deformation of each pass is 6-9%, and the annealing times after drawing are less than the times of the passes.
Example 2
The embodiment of the invention discloses a processing method of a magnesium alloy thin-wall pipe for a heart stent, which comprises the following steps:
the method comprises the following steps: the weight percentages are as follows: the method comprises the following steps of mixing raw materials of Y2%, RE 0.1%, Ca 0.01%, Zn 0.09%, Mn 1%, Sb 0.5%, Zr 0.1% and Mg 96.2%, performing melt smelting and casting to obtain a cast ingot, removing a surface layer containing impurities, performing hot extrusion to obtain a bar blank, and cutting and processing the bar blank in a segmented manner to obtain a pipe rough blank;
step two: heating the pipe to 390 ℃, extruding the rough pipe blank of the pipe to obtain a seamless extruded pipe blank, and then performing stress relief annealing in a vacuum atmosphere in an environment with argon as protective gas;
step three: polishing the inner wall and the outer wall of the pipe obtained in the step two, then cleaning the inner wall and the outer wall of the pipe, then carrying out heat treatment on the pipe to remove stress, and cooling after the heat treatment is finished;
step four: the method comprises the steps of processing the pipe by using a hydraulic pipe drawing machine, heating the pipe to 420 ℃ before drawing, lubricating the pipe by using grease in each drawing process, wherein the grease can be vegetable oil or animal oil, drawing is carried out in multiple passes, argon is used as protective gas during annealing, and the thin-walled pipe is finally formed through the multiple-pass drawing.
When the diameter of the pipe is larger than or equal to 3.5mm, the drawing deformation rate is 3-5 mm/s, and when the diameter of the pipe is smaller than 3.5mm, the drawing deformation rate is 2-3 mm/s. When the diameter of the pipe is larger than or equal to 3.5mm, the deformation of each pass is 10-12%, when the diameter of the pipe is smaller than 3.5mm, the deformation of each pass is 6-9%, and the annealing times after drawing are less than the times of the passes.
Example 3
The embodiment of the invention discloses a processing method of a magnesium alloy thin-wall pipe for a heart stent, which comprises the following steps:
the method comprises the following steps: the weight percentages are as follows: the method comprises the following steps of mixing raw materials of Y4%, RE 1%, Ca 1%, Zn 1%, Mn 1.7%, Sb 1%, Zr 1% and Mg 89.3%, carrying out melting, smelting and casting to obtain a cast ingot, removing a surface layer containing impurities, carrying out hot extrusion to obtain a bar blank, and cutting and processing the bar blank in a segmented manner to obtain a pipe blank;
step two: heating the pipe to 390 ℃, extruding the rough pipe blank of the pipe to obtain a seamless extruded pipe blank, and then performing stress relief annealing in a vacuum atmosphere in an environment with argon as protective gas;
step three: polishing the inner wall and the outer wall of the pipe obtained in the step two, then cleaning the inner wall and the outer wall of the pipe, then carrying out heat treatment on the pipe to remove stress, and cooling after the heat treatment is finished;
step four: the method comprises the steps of processing the pipe by using a hydraulic pipe drawing machine, heating the pipe to 420 ℃ before drawing, lubricating the pipe by using grease in each drawing process, wherein the grease can be vegetable oil or animal oil, drawing is carried out in multiple passes, argon is used as protective gas during annealing, and the thin-walled pipe is finally formed through the multiple-pass drawing.
When the diameter of the pipe is larger than or equal to 3.5mm, the drawing deformation rate is 3-5 mm/s, and when the diameter of the pipe is smaller than 3.5mm, the drawing deformation rate is 2-3 mm/s. When the diameter of the pipe is larger than or equal to 3.5mm, the deformation of each pass is 10-12%, when the diameter of the pipe is smaller than 3.5mm, the deformation of each pass is 6-9%, and the annealing times after drawing are less than the times of the passes.
The above description is only a preferred embodiment of the present invention, but other driving mechanisms including, but not limited to, motor driving and other driving sources are not intended to limit the present invention, and any modifications, equivalents and the like within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A processing method of a magnesium alloy thin-wall pipe for a heart stent is characterized by comprising the following steps:
the method comprises the following steps: performing melting, smelting and casting on the magnesium alloy to obtain a cast ingot, removing a surface layer containing impurities, performing hot extrusion to obtain a bar blank, and cutting and processing the bar blank in a segmented manner to obtain a pipe blank;
step two: extruding the pipe blank to obtain a seamless extruded pipe blank, and then performing stress relief annealing;
step three: polishing the inner wall and the outer wall of the pipe obtained in the step two, then cleaning the inner wall and the outer wall of the pipe, then carrying out heat treatment on the pipe to remove stress, and cooling after the heat treatment is finished;
step four: the method comprises the steps of processing the pipe by using a hydraulic pipe drawing machine, heating the pipe to 400-500 ℃ before drawing, lubricating the pipe by using grease in each drawing process, drawing in multiple passes, and drawing in multiple passes by using argon as protective gas during annealing to finally form the thin-walled pipe.
2. The method for processing the magnesium alloy thin-wall tube for the heart stent as set forth in claim 1, wherein in the second step, the tube blank is heated to 380-450 ℃ before the extrusion.
3. The processing method of the magnesium alloy thin-wall tube for the heart stent as recited in claim 1, wherein the heat treatment is performed by precooling and quenching, and the tube is cooled by compressed air after quenching.
4. The processing method of the magnesium alloy thin-wall tube for the heart stent according to claim 1, wherein seven alloy elements of yttrium Y, mixed rare earth RE, calcium Ca, manganese Mn, antimony Sb, zinc Zn and zirconium Zr are added into magnesium, and the mass percentages of the alloy elements in the magnesium alloy material are as follows: 1-4% of Y, 0.1-1% of RE, 0.01-1% of Ca, 0.1-1% of Zn, 0.1-1.7% of Mn, 0.1-1% of Sb, 0.1-1% of Zr and 89.3-98.2% of Mg; after adding alloy elements into pure magnesium, the magnesium alloy is smelted.
5. The method for processing the magnesium alloy thin-wall pipe for the heart stent according to claim 1, wherein the pipe is subjected to stress relief treatment in a vacuum atmosphere.
6. The processing method of the magnesium alloy thin-wall tube for the heart stent of claim 1, wherein in the fourth step, when the diameter of the tube is greater than or equal to 3.5mm, the drawing deformation rate is 3-5 mm/s, and when the diameter of the tube is less than 3.5mm, the drawing deformation rate is 2-3 mm/s.
7. The processing method of the magnesium alloy thin-wall tube for the cardiac stent according to claim 1, wherein in the fourth step, when the diameter of the tube is greater than or equal to 3.5mm, the deformation per pass is 10-12%, when the diameter of the tube is less than 3.5mm, the deformation per pass is 6-9%, and the annealing times after drawing are less than the times of the passes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110725508.8A CN113385899A (en) | 2021-06-29 | 2021-06-29 | Processing method of magnesium alloy thin-wall pipe for heart stent |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110725508.8A CN113385899A (en) | 2021-06-29 | 2021-06-29 | Processing method of magnesium alloy thin-wall pipe for heart stent |
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| CN113385899A true CN113385899A (en) | 2021-09-14 |
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| CN202110725508.8A Pending CN113385899A (en) | 2021-06-29 | 2021-06-29 | Processing method of magnesium alloy thin-wall pipe for heart stent |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101085377A (en) * | 2007-06-11 | 2007-12-12 | 沈阳工业大学 | Process for forming magnesium alloy ultra-fine thin-wall tube used for degradable blood vessel bracket |
| CN108262368A (en) * | 2017-08-21 | 2018-07-10 | 广东省材料与加工研究所 | A kind of preparation method of high-performance medical magnesium alloy thin-wall pipes |
| CN108145380B (en) * | 2017-12-07 | 2019-09-06 | 北京大学深圳研究院 | A kind of degradable processing method for absorbing bracket Mg alloy thin wall pipe |
-
2021
- 2021-06-29 CN CN202110725508.8A patent/CN113385899A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101085377A (en) * | 2007-06-11 | 2007-12-12 | 沈阳工业大学 | Process for forming magnesium alloy ultra-fine thin-wall tube used for degradable blood vessel bracket |
| CN108262368A (en) * | 2017-08-21 | 2018-07-10 | 广东省材料与加工研究所 | A kind of preparation method of high-performance medical magnesium alloy thin-wall pipes |
| CN108145380B (en) * | 2017-12-07 | 2019-09-06 | 北京大学深圳研究院 | A kind of degradable processing method for absorbing bracket Mg alloy thin wall pipe |
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