Magnesium wire and method for producing the same, and anastomosis nail

Abstract

The application provides a magnesium wire and a preparation method thereof and an anastomosis nail, and belongs to the technical field of medical metal materials. The preparation method comprises the following steps: extruding a magnesium metal ingot to obtain a magnesium metal rod; drawing the magnesium metal rod to obtain a drawn wire with a preset diameter; and winding the drawn wire and applying at least one shearing force to the drawn wire during the winding process, so that the drawn wire is subjected to unilateral asymmetric deformation treatment to obtain the magnesium wire. The preparation process is simple, unilateral asymmetric deformation treatment is used to make the upper and lower sides of the magnesium wire bear different forces, different prestresses are introduced, the risk of broken nails caused by different forces during the forming of the anastomosis nail is reduced, and in addition, the strong texture generated in the drawing process of the wire can be weakened, and the subsequent deformation or forming capacity of the magnesium wire is improved.

Description

Technical Field

[0001] This invention belongs to the field of medical metal materials technology, specifically relating to a magnesium metal wire and its preparation method. Background Technology

[0002] Anastomosing devices are commonly used medical instruments in clinical practice to replace manual suturing of tissues or organs, especially in suturing surgeries following partial gastrointestinal resections. Anastomosing staples are an important component of these devices and come in various models. Currently, the most commonly used staples are made of titanium alloy wire, which is chemically stable and has excellent mechanical properties. Therefore, it is non-degradable and permanently remains in the body after surgery. This may affect medical imaging or some medical tests, and there is even a risk of them detaching and scratching the gastrointestinal tract, or causing local rupture due to long-term friction, and it is also prone to causing inflammation and bacterial infection.

[0003] In actual postoperative recovery after anastomosis surgery, the staples only need to provide mechanical support for 1-2 weeks and do not need to be retained for a long period. Therefore, it has been proposed to use magnesium staples instead of titanium staples. Magnesium, as an essential macro-element for the human body, has good biocompatibility and can be gradually degraded in the human body environment, making it suitable for the use of staples.

[0004] However, magnesium has a close-packed hexagonal structure, resulting in weak deformation capacity. Besides the difficulty in fabricating magnesium wire, rapid bending during the fabrication and use of anastomotic staples easily leads to wire breakage, affecting the staple's shape and performance. Current main technical solutions involve fabricating small-diameter magnesium wires, but staples formed from these wires still experience breakage. Furthermore, during staple production and clinical use, the magnesium wire undergoes two bending processes to achieve the desired staple shape. The outer surface of the bent section experiences tensile stress, while the inner surface experiences compressive stress. This means that the inner and outer surfaces are subjected to different stresses during bending, increasing the risk of breakage. Simultaneously, the preferred orientation of the grains during the drawing deformation process of the magnesium wire tends to form a strong basal texture, which is also detrimental to bending deformation. Therefore, preventing staple breakage due to magnesium wire bending is a pressing issue that needs to be addressed. Summary of the Invention

[0005] The present invention aims to at least solve one of the technical problems existing in the prior art, and to provide a magnesium metal wire and its preparation method, as well as a staple.

[0006] In one aspect, the present invention provides a method for preparing magnesium metal wire, wherein the preparation method is described in part.

[0007] Preparation methods include:

[0008] Magnesium metal ingots are extruded to obtain magnesium metal rods;

[0009] The magnesium metal rod is drawn to obtain a drawn wire of a preset diameter;

[0010] The drawn wire is wound up, and at least one shear force is applied to the drawn wire during the winding process to cause it to undergo unilateral asymmetric deformation treatment to obtain magnesium metal wire.

[0011] Optionally, during the wire winding process of the drawn wire, at least one shear force is applied to cause it to undergo unilateral asymmetric deformation to obtain magnesium metal wire, including:

[0012] The drawn wire is wrapped around at least one shearing angle member for providing shear force and fixed to the take-up wheel;

[0013] Move the shearing angle member so that the drawn wire is taut and closely attached to the vertex of the shearing angle member and the first and second surfaces on both sides of the vertex;

[0014] The take-up wheel rotates at a constant speed to take in the wire, so that the drawn wire is deformed under unilateral force to form a magnesium metal wire.

[0015] Optionally, the included angle between the first and second surfaces of the shear angle member is 90-120°.

[0016] Optionally, the vertex and the first and second surfaces are provided with arcuate grooves along the moving direction of the drawn wire, and the drawn wire is attached to the surface of the arcuate groove.

[0017] Optionally, the radius of the arcuate groove matches the radius of the drawn wire; and / or,

[0018] The central angle corresponding to the arc groove is 60°.

[0019] Optionally, the number of shearing corner members is 1 to 5.

[0020] Optionally, the linear velocity of the take-up wheel rotating at a constant speed ranges from 0.5 to 5 m / min.

[0021] Optionally, the preset diameter of the drawn wire is 0.2 to 0.5 mm.

[0022] In another aspect of the present invention, a magnesium metal wire is provided, which is prepared by the method described above.

[0023] In another aspect, the present invention provides an anastomotic staple formed by bending the magnesium wire described above, wherein...

[0024] The stapler includes a first support wall and a second and a third support wall that bend from the first support wall to both sides;

[0025] A first bend is formed between the first support wall and the second support wall, and a second bend is formed between the first support wall and the third support wall;

[0026] The outer surfaces of the first bend and the second bend are the sides of the magnesium wire subjected to shear force.

[0027] This invention proposes a magnesium metal wire, its preparation method, and a staple. The preparation method includes: extruding a magnesium metal ingot to obtain a magnesium metal rod; drawing the magnesium metal rod to obtain a drawn wire of a predetermined diameter; winding the drawn wire and applying at least one shear force to the drawn wire during the winding process, causing it to undergo unilateral asymmetric deformation to obtain the magnesium metal wire. The preparation process of this invention is simple. Based on the unilateral asymmetric deformation process, the upper and lower sides of the magnesium metal wire are subjected to different forces, introducing different prestresses, reducing the risk of staple breakage caused by different forces during staple forming. At the same time, it can also weaken the strong texture generated in the wire during the drawing process, improving the subsequent deformation or forming ability of the magnesium metal wire. Attached Figure Description

[0028] Figure 1 This is a flowchart illustrating a method for preparing magnesium metal wire according to an embodiment of the present invention.

[0029] Figure 2 This is a schematic diagram of the deformation process of a magnesium wire under unilateral stress according to another embodiment of the present invention;

[0030] Figure 3 This is a side view of a shear angle member according to another embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of the structure of the anastomosis staple according to another embodiment of the present invention. Detailed Implementation

[0032] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0033] like Figure 1 As shown, one aspect of the present invention provides a method S100 for preparing magnesium metal wire, specifically including the following steps S110 to S130:

[0034] S110. Extruding magnesium metal ingots to obtain magnesium metal rods.

[0035] In some preferred embodiments, the magnesium metal ingot is a pure magnesium ingot.

[0036] In some other preferred embodiments, the magnesium metal ingot is a magnesium alloy ingot, such as a magnesium-zinc alloy ingot or a magnesium-zinc-calcium alloy ingot, which improves the corrosion resistance of the wire and slows down the degradation rate.

[0037] S120. The magnesium metal rod is drawn to obtain a drawn wire of a preset diameter.

[0038] In some preferred embodiments, the pre-set diameter of the drawn wire is 0.2-0.5 mm, which is suitable for the preparation of staples.

[0039] S130. Take in the drawn wire and apply at least one shear force to the drawn wire during the take-in process to make it undergo unilateral asymmetric deformation treatment to obtain magnesium metal wire.

[0040] Specifically, when the drawn wire is drawn to a preset diameter, a shearing angle member is placed in front of the take-up wheel. The drawn wire is wrapped around at least one shearing angle member to provide shearing force and fixed to the take-up wheel. At least one shearing angle member is moved so that the drawn wire is taut and pressed against the vertex of at least one shearing angle member and the first and second surfaces located on both sides of the vertex. The take-up wheel rotates at a constant speed to take in the wire, so that the drawn wire is deformed by force on one side to form a magnesium metal wire with a diameter of 0.2-0.5 mm.

[0041] It should be noted that, in this embodiment, the shearing angle member is a structure used to provide shear force to the drawn wire. Its cross-section is triangular, and the drawn wire is attached to the vertex and the first and second surfaces adjacent to both sides. The vertex serves as the point of application of the shear force. Thus, when passing through the vertex, the drawn wire is subjected to shear force.

[0042] It should be further noted that this embodiment does not specifically limit the fixing method of the shearing angle member, as long as it can act on the drawn wire and satisfy the force on the drawn wire.

[0043] For example, such as Figure 2 As shown, two shearing angle members 220 are placed in front of the take-up wheel 230, so that the drawn wire 210 is attached to the two shearing angle members 220 and taken up by the take-up wheel 230. Positioning wheels 240 are provided on both sides of each shearing angle member 220, and the drawn wire 210 is located below the positioning wheels 240. The positioning wheels 240 ensure that the drawn wire 210 adheres to the surface of the shearing angle member 220, while also ensuring that the drawn wire 210 is in a straight line. Figure 2 In the diagram, A represents the non-unilateral deformation surface of the magnesium wire under stress. Figure 2 B in the figure represents the deformation surface of the magnesium wire under stress on one side.

[0044] In this embodiment, the magnesium wire is subjected to unilateral asymmetric deformation by shearing corner members, so that the upper and lower sides of the magnesium wire are subjected to different forces, introducing different prestresses, reducing the risk of nail breakage caused by different forces during the forming of the staples; in addition, for magnesium wire, this method can weaken the strong texture generated by the wire during the drawing process, and improve the subsequent deformation or forming ability of the magnesium wire.

[0045] Furthermore, in this embodiment, such as Figure 2 As shown, the included angle θ between the first and second surfaces on the shearing angle member 220 is 90-120°, that is, the angle corresponding to the vertex of the shearing angle member around which the drawn wire is wound is 90-120°. When the drawn wire passes through this vertex, the vertex applies a shearing force to the drawn wire, so that the forces on both sides are different.

[0046] It should be noted that the angle of the aforementioned shearing angle member needs to match the diameter of the wire; that is, the angle can be adjusted according to the required diameter of the wire. In other words, within the aforementioned angle range, the shearing force provided by the shearing angle member to the drawn wire is appropriate, resulting in good asymmetric deformation treatment and meeting the diameter requirements of the magnesium wire. If the angle is too large, the shearing force on the wire decreases, leading to insufficient asymmetric deformation treatment; if the angle is too small, the shearing force on the wire increases, potentially causing breakage during the asymmetric deformation process.

[0047] It should be further noted that in this embodiment, the number of shearing corner members is not specifically limited and can be adjusted according to the diameter of the wire. For example, in some preferred embodiments, the number of shearing corner members is 1 to 5. By increasing or decreasing the number of shearing corner members, the degree of deformation and strengthening effect of the magnesium wire can be adjusted. For example, increasing the number of shearing corner members can increase the unilateral deformation effect of the wire.

[0048] It should be noted that the number of shearing corner components is also related to the angle of the shearing corner components. When the angle of the shearing corner components is large, the deformation effect is low. In this case, the number of shearing corner components can be increased to obtain wire with a higher unilateral deformation effect.

[0049] Furthermore, to ensure the drawn wire fits more closely to the surface of the shear angle member and prevents the drawn wire from slipping, such as... Figure 2 and Figure 3 As shown, the vertex of the shearing angle member 220 and the first and second surfaces are provided with arc grooves 221 along the moving direction (winding direction) of the drawn wire 210. In this way, during the winding process, the drawn wire 210 fits against the surface of the arc groove 221. The arc groove is equivalent to a channel for the drawn wire, allowing it to move along the channel.

[0050] It should be noted that the radius of the arc groove is consistent with the radius of the drawn wire, so that the drawn wire fits snugly within the groove. For example, when the diameter of the drawn wire is 0.2-0.5 mm, the radius of the arc groove is 0.1 mm to 0.25 mm. Furthermore, the central angle corresponding to the arc groove is 60°, so that one-sixth of the area of ​​the drawn wire is stressed, which is close to the main stress-bearing area when magnesium wire is bent.

[0051] Furthermore, the linear speed range of the uniform rotation of the take-up wheel is 0.5-5 m / min. By combining the angle of the shearing angle component with the take-up speed, the deformation of the magnesium wire can be achieved, while avoiding excessive force that could cause the wire to break, so that the drawn wire enters the take-up wheel at a uniform speed.

[0052] In this embodiment, asymmetric deformation of the magnesium wire can be achieved through ingot extrusion, bar drawing, and unilateral wire deformation. This reduces the risk of breakage caused by uneven stress during stud forming and weakens the strong texture of the wire, thereby improving the subsequent deformation or forming capacity of the magnesium wire. Furthermore, the preparation process of this embodiment is simple and easily adjustable, and can be implemented by modifying traditional wire drawing equipment, resulting in low cost.

[0053] In another aspect, the present invention provides a magnesium metal wire, which is prepared by the method described above. For the specific preparation process, please refer to the description above, and it will not be repeated here.

[0054] like Figure 4 As shown, in another aspect of the present invention, an anastomosis staple is provided, which is formed by bending magnesium wire. The anastomosis staple 300 includes a first support wall 310 and a second support wall 320 and a third support wall 330 bent from the first support wall 310 to both sides. The second support wall 320 is bent between the first support wall 310 to form a first bending portion 340, and the third support wall 330 is bent between the first support wall 310 to form a second bending portion 350.

[0055] For further information, please continue to refer to [link / reference]. Figure 4 The side of the magnesium wire subjected to shear force serves as the outer surface of the bend in the staple, while the inner surfaces of the first bend 340 and the second bend 350 are non-unilateral deformation surfaces of the magnesium wire. Figure 2 On side A, the outer surfaces of the first bend 340 and the second bend 350 are unilateral stress-deformation surfaces of the magnesium wire, such as... Figure 2 Side B in this embodiment. In other words, the magnesium wire in this embodiment is easy to bend and deform, and is not easy to break during the bending process. The shear force surface of the magnesium wire is bent outward to form a staple, that is, the shear force surface is the outer surface of the staple bending point, so that the staple is not easy to break.

[0056] The preparation method of magnesium metal wire will be further illustrated below with reference to several specific embodiments:

[0057] Example 1

[0058] The method for preparing magnesium metal wire in this embodiment includes the following steps:

[0059] S1. Extrude magnesium-zinc alloy ingots with a zinc content of 2wt% to obtain magnesium-zinc alloy bars.

[0060] S2. The magnesium-zinc alloy bar obtained in step S1 is drawn. When it is drawn to a diameter of 0.3 mm, it is formed into a drawn wire.

[0061] S3. Place a shearing angle member in front of the take-up wheel, pass the drawn wire around the shearing angle member, and then fix it to the take-up wheel;

[0062] S4. Move the shearing angle member to make the drawn wire taut and close to the vertex of the shearing angle member and the first and second surfaces located on both sides of the vertex.

[0063] S5. The take-up wheel rotates at a constant speed to take in the wire, which undergoes deformation under unilateral stress to obtain magnesium-zinc alloy wire. Please refer to [reference needed] for the specific stress process. Figure 2 .

[0064] Furthermore, in this embodiment 1, the included angle θ between the first surface and the second surface of the shearing corner member is 90°. The vertex, the first surface, and the second surface of the shearing corner member are provided with arc grooves with an arc radius of 0.15mm and an angle of 60°. A total of 2 shearing corner members are provided, and the linear speed of the take-up wheel rotating at a uniform speed is 3m / min.

[0065] The magnesium-zinc alloy wire prepared in Example 1 is bent into shape to form a magnesium-zinc staple. The shear force surface of the magnesium-zinc alloy wire is bent outwards, meaning the shear force surface serves as the outer surface of the staple's bend.

[0066] Example 2

[0067] The method for preparing magnesium metal wire in this embodiment includes the following steps:

[0068] S1. Take pure magnesium ingots and extrude them to obtain pure magnesium rods;

[0069] S2. The pure magnesium rod obtained in step S1 is drawn. When it is drawn to a diameter of 0.5 mm, it forms a drawn wire.

[0070] S3. Place a shearing angle member in front of the take-up wheel, pass the drawn wire around the shearing angle member, and then fix it to the take-up wheel;

[0071] S4. Move the shearing angle member to make the drawn wire taut and close to the vertex of the shearing angle member and the first and second surfaces located on both sides of the vertex.

[0072] S5. The take-up wheel rotates at a constant speed to take in the wire. After deformation under unilateral stress, pure magnesium wire is obtained. Please refer to [reference needed] for the specific stress process. Figure 2 .

[0073] Furthermore, in this embodiment 2, the included angle θ between the first surface and the second surface of the shearing corner member is 120°. The vertex, the first surface, and the second surface of the shearing corner member are provided with arc grooves with an arc radius of 0.25mm and an angle of 60°. A total of 5 shearing corner members are provided, and the linear speed of the take-up wheel rotating at a uniform speed is 0.5m / min.

[0074] The pure magnesium wire prepared in Example 2 was bent into shape to form a pure magnesium staple. The shear force surface of the pure magnesium wire was bent outwards, meaning the shear force surface served as the outer surface of the staple's bend.

[0075] Example 3

[0076] The method for preparing magnesium metal wire in this embodiment includes the following steps:

[0077] S1. Extrude magnesium-zinc-calcium alloy ingots with a zinc content of 2wt% and a calcium content of 0.5wt% to obtain magnesium-zinc alloy bars.

[0078] S2. The magnesium-zinc-calcium alloy rod obtained in step S1 is drawn. When the diameter is drawn to 0.2 mm, a drawn wire is formed.

[0079] S3. Place a shearing angle member in front of the take-up wheel, pass the drawn wire around the shearing angle member, and then fix it to the take-up wheel;

[0080] S4. Move the shearing angle member to make the drawn wire taut and close to the vertex of the shearing angle member and the first and second surfaces located on both sides of the vertex.

[0081] S5. The take-up wheel rotates at a constant speed to take in the wire, which undergoes deformation under unilateral stress to obtain magnesium-zinc-calcium alloy wire. Please refer to [reference needed] for the specific stress process. Figure 2 .

[0082] Furthermore, in this embodiment 3, the included angle θ between the first surface and the second surface of the shearing angle member is 100°. The vertex, the first surface, and the second surface of the shearing angle member are provided with arc grooves with an arc radius of 0.1mm and an angle of 60°. A total of one shearing angle member is provided, and the linear speed of the take-up wheel rotating at a uniform speed is 5m / min.

[0083] The magnesium-zinc-calcium alloy wire prepared in Example 3 is bent into shape to form a magnesium-zinc-calcium staple. The shear force surface of the magnesium-zinc-calcium alloy wire is bent outwards, meaning the shear force surface serves as the outer surface of the staple's bend.

[0084] This invention proposes a magnesium metal wire and its preparation method, as well as a staple, which has the following beneficial effects:

[0085] First, the preparation process of the present invention is simple and easy to adjust, and can be modified on traditional wire drawing equipment to prepare magnesium metal wire, thereby reducing the preparation cost.

[0086] Secondly, this invention utilizes shearing angle components to perform unilateral asymmetric deformation treatment on magnesium wire, so that the upper and lower sides of the magnesium wire are subjected to different forces, introducing different prestresses, and reducing the risk of nail breakage caused by different forces during the forming of the staples.

[0087] Third, based on asymmetric deformation processing, this invention can weaken the strong texture generated in magnesium wire during the drawing process and improve the subsequent deformation or forming ability of magnesium wire.

[0088] Fourth, the angle of the shearing angle component of the present invention, combined with the wire winding speed, can achieve deformation treatment of magnesium wire without causing excessive stress that could lead to wire breakage. Furthermore, the degree of deformation and strengthening effect of magnesium wire can be improved by adjusting the number of shearing angle components.

[0089] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A method for preparing magnesium metal wire, characterized in that, The preparation method includes: Magnesium metal ingots are extruded to obtain magnesium metal rods; The magnesium metal rod is drawn to obtain a drawn wire of a preset diameter; The drawn wire is wound up, and at least one shear force is applied to the drawn wire during the winding process to subject it to unilateral asymmetric deformation, including: The drawn wire is wrapped around at least one shearing angle member for providing shear force and fixed to the take-up wheel; The shearing angle member is moved so that the drawn wire is taut and closely adheres to the vertex of the shearing angle member and the first and second surfaces on both sides of the vertex; the vertex and the first and second surfaces are provided with arc grooves along the moving direction of the drawn wire, the drawn wire is attached to the surface of the arc groove, the radius of the arc groove matches the radius of the drawn wire, and the central angle corresponding to the arc groove is 60°, so that the force-bearing area of ​​the drawn wire is close to the main force-bearing area when the magnesium wire is bent; The take-up wheel rotates at a constant speed to take up the wire, so that the drawn wire is deformed under unilateral force. The upper and lower sides of the magnesium wire are subjected to different forces, resulting in magnesium wires with different prestresses. The side of the magnesium wire subjected to shear force serves as the outer surface of the joint bend.

2. The preparation method according to claim 1, characterized in that, The included angle between the first and second surfaces of the shear angle member is 90-120°.

3. The preparation method according to claim 1, characterized in that, The number of shearing corner components is 1 to 5.

4. The preparation method according to claim 1, characterized in that, The linear velocity of the take-up wheel is in the range of 0.5 to 5 m / min.

5. The preparation method according to any one of claims 1 to 4, characterized in that, The preset diameter of the drawn wire is 0.2 to 0.5 mm.

6. A magnesium metal wire, characterized in that, It is prepared by the method described in any one of claims 1 to 5.

7. A stapler, characterized in that, The anastomotic staple is formed by bending the magnesium metal wire as described in claim 6; wherein... The stapler includes a first support wall and a second and a third support wall that bend from the first support wall to both sides; A first bend is formed between the first support wall and the second support wall, and a second bend is formed between the first support wall and the third support wall; The outer surfaces of the first bend and the second bend are the sides of the magnesium wire subjected to shear force.

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