Die and method for semi-solid extrusion thixotropy of degradable magnesium alloy microtubes

A semi-solid extrusion and thixoforming technology, which is applied in the field of forming medical metal materials, can solve the problems of poor mechanical properties of polymer stents, undeveloped manufacturing process and manufacturing equipment, and high manufacturing difficulty, so as to achieve small thermal deformation , Precise molding, high precision effect

Active Publication Date: 2015-09-09
JINAN UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The metal stents currently used clinically (316L, NiTi alloy, etc.) are permanently implanted, and patients need to take anticoagulant and anti-inflammatory drugs for a long time; while the mechanical properties of polymer stents are poor, and it is easy to generate heat, monomers, small molecules, etc. during degradation substances harmful to the human body
Studies have shown that degradable magnesium alloy stents have good biocompatibility, and magnesium is an essential element in the human body. It can be absorbed after being degraded within a certain period of time in the body, but it is difficult to manufacture, and the material is not widely used at present. , and its manufacturing process and manufacturing equipment are yet to be developed

Method used

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  • Die and method for semi-solid extrusion thixotropy of degradable magnesium alloy microtubes
  • Die and method for semi-solid extrusion thixotropy of degradable magnesium alloy microtubes
  • Die and method for semi-solid extrusion thixotropy of degradable magnesium alloy microtubes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In this embodiment, a semi-solid extrusion thixotropic molding die of a degradable magnesium alloy microtube, such as image 3 As shown, it includes a matching punch 1 and a die 2, the die is fixed on the bottom of the extrusion cylinder 3, and the punch is arranged on the top of the extrusion cylinder, as figure 2 As shown, a core rod 4 and a core rod fixing plate 5 are also provided between the punch and the die, the core rod is embedded in the core rod fixing plate, the bottom of the core rod extends into the die, and the bottom of the punch and the core rod fixing plate The tops are connected, and one side of the core rod fixing plate extends into the space in the middle of the extrusion cylinder, such as image 3 As shown, the core rod fixing plate and the space in the middle of the extrusion barrel form a notched annular space.

[0031] Such as figure 1 As shown, the die includes a left die 2-1 and a right die 2-2, a bottle-shaped space is formed between the le...

Embodiment 2

[0038] In this example, a degradable magnesium alloy microtube with an inner diameter of 1.5 mm and a thickness of 0.1 mm is prepared by the mold described in Example 1, and its forming method includes the following steps:

[0039] (1) The magnesium alloy material of ZK60 (40%)+WE43 (60%) is made into powder by ball milling, and the powder particle size is 0.01~0.1mm, and argon gas as an inert protective gas is added during the ball milling process to prevent the powder from oxidation;

[0040] (2) Evenly coating graphite as a lubricant on the inner surface of the extrusion cylinder, the inner surface of the die, the outer surface of the punch, the side surface of the core rod fixing plate located in the extrusion cylinder and the outer surface of the core rod;

[0041] (3) Put the powder into the extrusion barrel, and adjust the parameters of the pressure equipment, such as the pressure is 80-100KN, the speed is automatic, and the temperature is 580-650°C;

[0042] (4) Heat t...

Embodiment 3

[0047] In this example, a degradable magnesium alloy microtube with an inner diameter of 2.0mm and a thickness of 0.1mm is prepared by the mold described in Example 1, and its forming method includes the following steps:

[0048] (1) The magnesium alloy material of MB1 (40%)+MB15 (60%) is made into powder by ball milling, the powder particle size is 0.01~0.1mm, and argon gas is added as an inert protective gas during the ball milling process to prevent powder oxidation;

[0049] (2) Evenly coating graphite as a lubricant on the inner surface of the extrusion cylinder, the inner surface of the die, the outer surface of the punch, the side surface of the core rod fixing plate located in the extrusion cylinder and the outer surface of the core rod;

[0050] (3) Put the powder into the extrusion cylinder, and adjust the parameters of the pressure equipment, such as the pressure is 100-120KN, the speed is automatic, and the temperature is 500-550°C;

[0051] (4) Heat the mold in a ...

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Abstract

The invention discloses a semisolid extrusion and thixomolding mould and method for a degradable magnesium alloy micro cautery. The semisolid extrusion and thixomolding mould for the degradable magnesium alloy micro cautery is characterized in that a core bar and a core bar fixing plate are arranged between a punch and a matrix, the core bar is inserted into the core bar fixing plate, the bottom of the core bar extends into the matrix, the bottom of the punch is connected with the top of the core bar fixing plate, one side of the core bar fixing plate extends into the space of the middle portion of an extruding container, and the core bar fixing plate and the space of the middle portion of the extruding container form a ring-shaped space with a notch. The semisolid extrusion and thixomolding method for the degradable magnesium alloy micro cautery comprises firstly grinding magnesium alloy raw materials into powders, then placing the powders in the extruding container, heating the mould to enable the magnesium alloy materials to turn into semisolid blanks of solid-liquid coexistence, and pressing the punch downward on the semisolid blanks to enable the semisolid blanks to enter the matrix to being subjected to thixomolding to form the micro cautery. The magnesium alloy micro cautery formed through the semisolid extrusion and thixomolding mould and method for the degradable magnesium alloy micro cautery is accurate in structure and high in forming efficiency and can be well applied to medical permanent implantation stents.

Description

technical field [0001] The invention relates to the technical field of forming medical metal materials, in particular to a semi-solid extrusion thixotropic forming die and method for degradable magnesium alloy microtubes. Background technique [0002] Transcatheter interventional therapy is one of the most commonly used treatments for vascular diseases (stenosis, thrombus, plaque, etc.), especially percutaneous transluminal coronary angioplasty is a very effective treatment for coronary atherosclerotic diseases. The metal stents currently used clinically (316L, NiTi alloy, etc.) are permanently implanted, and patients need to take anticoagulant and anti-inflammatory drugs for a long time; while the mechanical properties of polymer stents are poor, and it is easy to generate heat, monomers, small molecules, etc. during degradation Substances harmful to the human body. Studies have shown that degradable magnesium alloy stents have good biocompatibility, and magnesium is an es...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D17/22B22F3/22B22F3/20
Inventor 滑有录李卫
Owner JINAN UNIVERSITY
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