CN115635082A - Degradable porous metal bone nail and additive manufacturing method thereof - Google Patents
Degradable porous metal bone nail and additive manufacturing method thereof Download PDFInfo
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- CN115635082A CN115635082A CN202211245935.7A CN202211245935A CN115635082A CN 115635082 A CN115635082 A CN 115635082A CN 202211245935 A CN202211245935 A CN 202211245935A CN 115635082 A CN115635082 A CN 115635082A
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- bone nail
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention provides a degradable porous metal bone nail and an additive manufacturing method thereof, and relates to the field of medical instruments. The degradable porous metal bone nail and the additive manufacturing method thereof comprise a hollow screw, wherein a plurality of porous structures are fixedly arranged inside the hollow screw, a screw cap is fixedly arranged at the upper end of the hollow screw, a self-tapping drill bit is fixedly arranged at the lower end of the hollow screw, and a self-tapping groove is formed in one side of the lower end of the self-tapping drill bit. The interior of the bone screw is set to be a tetrahedron structure or a diamond structure or a gyroid tiny curved surface structure or a mixture of a plurality of structures, the structure can be guaranteed to be firm, the design of the porous structure is also beneficial to cell adhesion appreciation, the bonding strength with regeneration tissues is improved, degradable metals are used as raw materials, metal bone screws made of different materials can be manufactured according to different degradation rates of the zinc, magnesium, iron or molybdenum degradable metals in vivo, the metal bone screws are used for different parts, the material increase manufacturing process is adopted in the process, and the complex porous structure bone screws can be accurately manufactured.
Description
Technical Field
The invention relates to the field of medical instruments, in particular to a degradable porous metal bone nail and an additive manufacturing method thereof.
Background
The metal material is the first biomaterial studied, has good tensile strength and toughness, is particularly suitable for repairing the defect of hard tissues of an organism, and commonly used metal materials comprise stainless steel, cobalt-chromium alloy, titanium alloy and magnesium alloy, wherein the stainless steel and the cobalt-chromium alloy are the first biomaterials used in clinical orthopedics department and have better effect.
Present traditional bone nail material adopts titanium alloy more, inert metals such as stainless steel, and elastic modulus is high, produces stress and shields, easily leads to the bone nail not hard up, needs the secondary operation to take out, causes secondary infection to the bone nail is mostly solid material, and is low with regeneration bone tissue bonding strength, but traditional processing means is difficult to process porous bone nail.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a degradable porous metal bone nail and an additive manufacturing method thereof, which solve the problems that the bone nail is easy to loosen, needs to be taken out by a secondary operation, causes secondary infection and is difficult to process by traditional manual operation.
(II) technical scheme
In order to realize the purpose, the invention is realized by the following technical scheme: the degradable porous metal bone nail comprises a hollow screw, a plurality of porous structures are fixedly arranged inside the hollow screw, a nut is fixedly arranged at the upper end of the hollow screw, a self-tapping drill bit is fixedly arranged at the lower end of the hollow screw, and a self-tapping groove is formed in one side of the lower end of the self-tapping drill bit.
Preferably, the additive manufacturing method of the degradable porous metal bone nail specifically comprises the following steps;
s1, selecting materials
Selecting metal powder materials with different degradation speeds according to different parts of the bone nail to be installed;
s2, heating materials
Heating and drying the metal powder in a vacuum drying oven;
s3, selecting a substrate
Selecting an alloy with the same component as the metal powder material as a substrate, and preheating the substrate;
s4, making a model
Manufacturing a three-dimensional model of the porous metal bone nail by three-dimensional drawing software;
s5, setting printing
Importing the three-dimensional model into layered software, adding supports, carrying out slicing processing, setting printing parameters, generating a printing file, transmitting the printing file to a laser powder bed, setting melting printing parameters of the laser powder bed, and printing;
s6, printing is finished
Separating the printed porous metal bone nail from the substrate to obtain a finished porous metal bone nail product;
s7, cleaning and polishing
Polishing the porous metal bone nail by adopting an alcohol solution of hydrochloric acid and nitric acid or phosphoric acid;
s8. Tip polishing
And grinding the tip of the self-tapping drill.
Preferably, the metal powder material can be magnesium, molybdenum, iron or zinc, and the degradation rate is 15-30% for magnesium 1 month, 2-10% for iron 1 month and 5-15% for zinc 1 month.
Preferably, the temperature for heating and drying the metal powder is 60-150 ℃, and the drying time is 3-6 hours.
Preferably, the substrate is preheated at a temperature of 50 to 500 ℃.
Preferably, the porous metal bone nail is a laser powder bed fusion forming part, and the fusion printing parameters of the laser powder bed are as follows: the diameter of a laser spot is 20-100 mu m, the laser power is 50-200W, the laser scanning speed is 100-2000mm/s, the laser filling interval is 50-80% of the width of a molten pool, the powder spreading thickness is 20-70 mu m, and the included angle of the adjacent powder spreading layers in the laser scanning direction is 45-90 degrees.
Preferably, the respective volume concentration ranges of the hydrochloric acid and the nitric acid in the alcohol are 1-5%, and the volume ratio of the hydrochloric acid to the nitric acid is 1.
Preferably, the porous structure is arranged in a tetrahedral or diamond structure or a gyroid minimal curve structure or a mixture of a plurality of structures.
(III) advantageous effects
The invention provides a degradable porous metal bone nail and an additive manufacturing method thereof. The method has the following beneficial effects:
1. compared with the traditional metal bone nail, the metal bone nail is internally provided with a porous structure, so that the structure is firm, the design of the porous structure is favorable for cell adhesion and proliferation, and the bonding strength with regenerated tissues is improved.
2. The invention provides a degradable porous metal bone nail and an additive manufacturing method thereof.
3. The invention provides a degradable porous metal bone nail and an additive manufacturing method thereof.
Drawings
FIG. 1 is a schematic front view of the present invention;
FIG. 2 is a schematic axial view of a porous structure according to the present invention;
FIG. 3 is a schematic diagram of a diamond construction according to the present invention;
FIG. 4 is a schematic view of a gyroid minimum curved surface structure according to the present invention;
FIG. 5 is a graph showing the results of the present invention.
Wherein, 1, porous structure; 2. self-tapping a groove; 3. a self-tapping drill bit; 4. a hollow screw; 5. a nut; 6. a diamond structure; 7. gyroid tiny surface structures.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 (b):
as shown in fig. 1-5, an embodiment of the present invention provides a degradable porous metal bone nail, which includes a hollow screw 4, wherein the porous structure is favorable for cell adhesion and proliferation, and improves the bonding strength with regenerated tissue, the hollow screw 4 is internally and fixedly provided with a plurality of porous structures 1, and the triangular and diamond and gyroid minimum curved surface structures have stability, so that the firmness of the metal bone nail is greatly improved, the contact area is large, and the cell adhesion is favorable, the upper end of the hollow screw 4 is fixedly provided with a nut 5, so that medical personnel can conveniently fix the bone nail, the lower end of the hollow screw 4 is fixedly provided with a self-tapping drill 3, so that the bone nail can be easily installed in a labor-saving manner, and a self-tapping groove 2 is formed in one side of the lower end of the self-tapping drill 3.
A degradable porous metal bone nail additive manufacturing method specifically comprises the following steps;
s1, selecting materials
Selecting metal powder materials with different degradation speeds according to different parts of the bone nail to be installed;
s2, heating materials
Heating and drying the metal powder in a vacuum drying oven to avoid mixing impurities in the printing process;
s3, selecting a substrate
Selecting an alloy with the same components as the metal powder material as a substrate, and preheating the substrate to prevent the substrate from deforming when suddenly contacted with high temperature;
s4, making a model
The three-dimensional model of the porous metal bone nail is manufactured through three-dimensional drawing software, and the drawn three-dimensional model can be automatically printed;
s5, setting printing
Importing the three-dimensional model into layered software, adding supports, carrying out slicing processing, setting printing parameters, generating a printing file, transmitting the printing file to a laser powder bed, setting melting printing parameters of the laser powder bed, and printing;
s6, printing is finished
Separating the printed porous metal bone nail from the substrate to obtain a finished porous metal bone nail product;
s7, cleaning and polishing
Polishing the porous metal bone nail by adopting an alcohol solution of hydrochloric acid and nitric acid or phosphoric acid to eliminate surface impurities;
s8. Tip polishing
The tip of the self-tapping drill 3 is polished to be sharp, so that the self-tapping drill is more convenient to install and fix.
As shown in fig. 5, the metal bone nail is actually printed, and can be upgraded and modified according to fig. 5, not only the structure shown in fig. 1 is modified, the metal powder material can be magnesium, molybdenum, iron or zinc, the degradation rate of magnesium is 15-30% in 1 month, iron is 2-10% in 1 month, zinc is 5-15% in 1 month, and a suitable metal can be selected according to the connection rate and the healing rate, so as to achieve the best treatment effect, the temperature for heating and drying is 60-150 ℃, the drying time is 3-6 hours, so as to ensure that the metal powder can be dried and in the best state to be processed, and the working efficiency can be improved after heating, the temperature for preheating is 50-500 ℃, the slightly higher temperature can make the substrate better maintain the temperature similar to that of the metal powder, the porous metal bone nail is a laser powder bed fusion and forming part, and the fusion printing parameters of the laser powder bed are as follows: the laser spot diameter is 50-100 mu m, the laser power is 50-200W, the laser scanning speed is 100-2000mm/s, the laser filling interval is 50-80% of the laser spot diameter, the powder laying thickness is 20-70 mu m, the included angle between adjacent powder laying layers in the laser scanning direction is 45-90 degrees, the printing efficiency is higher, the printed metal bone nail has better quality, the respective volume concentration range of hydrochloric acid and nitric acid in alcohol is 1-5%, the volume ratio of hydrochloric acid and nitric acid is 1, impurities or burrs on the surface of the metal bone nail can be removed, a porous structure 1 is a tetrahedron or a diamond structure 6 or a gyroid minimum curved surface structure or a mixture of a plurality of structures and the like, and a self-tapping groove penetrates through the whole metal bone nail, can provide a channel for a fixing auxiliary agent, and can enhance the bone nail fixing effect.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides a degradable porous metal bone nail, includes hollow screw (4), its characterized in that: the hollow screw rod is characterized in that a plurality of porous structures (1) are fixedly arranged inside the hollow screw rod (4), a nut (5) is fixedly arranged at the upper end of the hollow screw rod (4), a self-tapping drill bit (3) is fixedly arranged at the lower end of the hollow screw rod (4), and a self-tapping groove (2) is formed inside one side of the lower end of the self-tapping drill bit (3).
2. The additive manufacturing method of the degradable porous metal bone nail is characterized by comprising the following steps;
s1, selecting materials
Selecting metal powder materials with different degradation speeds according to different parts of the bone nail to be installed;
s2, heating materials
Heating and drying the metal powder in a vacuum drying oven;
s3, selecting a substrate
Selecting an alloy with the same component as the metal powder material as a substrate, and preheating the substrate;
s4, making a model
Manufacturing a three-dimensional model of the porous metal bone nail by three-dimensional drawing software;
s5, setting printing
Importing the three-dimensional model into layered software, adding supports, carrying out slicing processing, setting printing parameters, generating a printing file, transmitting the printing file to a laser powder bed, setting melting printing parameters of the laser powder bed, and printing;
s6, printing is finished
Separating the printed porous metal bone nail from the substrate to obtain a finished porous metal bone nail product;
s7, cleaning and polishing
Polishing the porous metal bone nail by adopting an alcohol solution of hydrochloric acid and nitric acid or phosphoric acid
S8. Tip polishing
And grinding the tip of the self-tapping drill (3).
3. The additive manufacturing method of the degradable porous metal bone nail according to claim 2, wherein: the metal powder material can be magnesium, iron or zinc, and the degradation rate is 15-30% for magnesium 1 month, 2-10% for iron 1 month and 5-15% for zinc 1 month.
4. The additive manufacturing method of the degradable porous metal bone nail according to claim 2, wherein the manufacturing method comprises the following steps: the temperature for heating and drying the metal powder is 60-150 ℃, and the drying time is 3-6 hours.
5. The additive manufacturing method of the degradable porous metal bone nail according to claim 2, wherein: the preheating temperature of the substrate is 50-500 ℃.
6. The additive manufacturing method of the degradable porous metal bone nail according to claim 2, wherein: the porous metal bone nail is a laser powder bed melting forming part, and the melting printing parameters of the laser powder bed are as follows: the diameter of a laser spot is 20-100 mu m, the laser power is 50-200W, the laser scanning speed is 100-2000mm/s, the laser filling interval is 50-80% of the width of a molten pool, the powder spreading thickness is 20-70 mu m, and the included angle of the adjacent powder spreading layers in the laser scanning direction is 45-90 degrees.
7. The additive manufacturing method of the degradable porous metal bone nail according to claim 2, wherein the manufacturing method comprises the following steps: the respective volume concentration ranges of the hydrochloric acid and the nitric acid in the alcohol are 1-5%, and the volume ratio of the hydrochloric acid to the nitric acid is 1.
8. The degradable porous metal bone peg of claim 1, wherein: the porous structure (1) is arranged into a tetrahedron or diamond structure (6) or a gyroid tiny curved surface structure (7) or a mixture of a plurality of structures and the like.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211245935.7A CN115635082A (en) | 2022-10-12 | 2022-10-12 | Degradable porous metal bone nail and additive manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211245935.7A CN115635082A (en) | 2022-10-12 | 2022-10-12 | Degradable porous metal bone nail and additive manufacturing method thereof |
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| CN115635082A true CN115635082A (en) | 2023-01-24 |
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| CN202211245935.7A Pending CN115635082A (en) | 2022-10-12 | 2022-10-12 | Degradable porous metal bone nail and additive manufacturing method thereof |
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| CN114082983A (en) * | 2021-11-08 | 2022-02-25 | 李鹏 | Preparation method of 3D printing spine porous fixing nail rod |
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2022
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| CN105147383A (en) * | 2015-10-28 | 2015-12-16 | 赵德伟 | Porous tantalum metal hollow screw and application thereof |
| CN106676356A (en) * | 2016-12-09 | 2017-05-17 | 中北大学 | Magnesium alloy bone fixing implant material preparation method based on laser melting forming technology |
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| CN216317908U (en) * | 2021-09-22 | 2022-04-19 | 创美得医疗器械（天津）有限公司 | Magnesium alloy compression screw |
| CN114082983A (en) * | 2021-11-08 | 2022-02-25 | 李鹏 | Preparation method of 3D printing spine porous fixing nail rod |
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