Die for enhancing clamping stability of suture needle and needle clamping machine composed of die

Abstract

The utility model provides a mold for enhancing clamping stability of a suture needle and a needle clamping machine composed of the mold, and belongs to the technical field of medical instrument machining devices.The mold comprises an upper mold, a lower mold, a first pressing groove and a second pressing groove, and a first protruding point with the arc-shaped top face is arranged in the middle of the first pressing groove; a first protruding point with an arc-shaped top face is arranged in the middle of the first pressing groove, a second protruding point with an arc-shaped top face is arranged in the middle of the second pressing groove, the height of the first protruding point and the height of the second protruding point do not exceed the diameter of the suture needle, and the width of the first protruding point and the width of the second protruding point do not exceed the diameter of a needle hole of the suture needle. The first press-fit groove and the second press-fit groove form a circular press-fit hole, a gap is formed between the first protruding point and the second protruding point, it is guaranteed that in the sewing process of a surgical suture, the needle thread cannot loosen or fall off, and the safety and effectiveness of an operation are improved; meanwhile, the preparation process is simplified, and the production cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of medical device processing equipment technology, specifically to a mold for enhancing the stability of suture needle clamping and a needle clamping machine composed thereof. Background Technology

[0002] Sutures are indispensable instruments in modern surgery. Surgical sutures are composed of suture needles and thread, and the bonding strength of this connection is crucial for surgical outcomes and patient safety. Currently, most suture needle-thread connections rely on mold pressing. However, when using a needle clamping machine, adjustments to the clamping force and mold size are necessary. If the mold and needle size are not properly matched—for example, a mold that is too large will result in insufficient pressure between the needle and suture, making them prone to detachment; a mold that is too small will result in a rougher, less smooth clamped area. Therefore, insufficient or excessive pressure from the needle clamping machine can lead to needle-thread separation or suture deformation.

[0003] Chinese patent CN104939879A discloses a method for connecting a non-destructive suture needle and suture. This method achieves a strong connection through two stamping processes, aiming to overcome the shortcomings of traditional methods. In the first stamping, after the suture is inserted into the blind hole of the suture needle, a special mold is used to stamp it, forming an elliptical cross-section of the blind hole, initially fixing the suture. The second horizontal stamping, while keeping the mold closed, moves and stamps again, restoring the cross-section of the blind hole to a circular shape, while simultaneously causing the suture end to naturally form a protrusion, further enhancing the connection stability. However, although this method improves connection strength and production efficiency, its long-term reliability, cost-effectiveness, and applicability to different materials still need to be evaluated, especially given its complex manufacturing process, which increases production costs. Summary of the Invention

[0004] Purpose of the invention: The purpose of this invention is to address the shortcomings of existing technologies, such as easy separation of needles and sutures or excessively high production costs, by providing a mold and a needle clamping machine that enhances the stability of suture needle clamping. This solves the problems of easy suture detachment and easy deformation of suture needles and sutures in existing connection methods, ensuring that surgical sutures do not loosen or fall off during the suturing process, thereby improving the safety and effectiveness of surgery. At the same time, it simplifies the manufacturing process and reduces production costs.

[0005] Technical Solution: The present invention discloses a mold for enhancing the clamping stability of suture needles and a needle clamping machine thereof, comprising an upper mold and a lower mold. A first pressing groove is provided at the center of the bottom surface of the upper mold, and a second pressing groove is provided at the center of the top surface of the lower mold. A first protruding point with an arc-shaped top surface is provided at the center of the first pressing groove, and a second protruding point with an arc-shaped top surface is provided at the center of the second pressing groove. The height of both the first and second protruding points does not exceed the diameter of the suture needle, and the width of both the first and second protruding points does not exceed the diameter of the needle hole of the suture needle. When the first and second pressing grooves are pressed together, they form a circular pressing hole, and there is a gap between the first and second protruding points.

[0006] In this invention, the arc-shaped protrusions of the upper and lower molds form a three-dimensional clamping structure during pressing. When the suture needle and thread are placed in the groove, the first protrusion (upper mold) and the second protrusion (lower mold) apply radial pressure to the needle hole wall in a symmetrical manner. Since the height of the protrusions is strictly controlled within the diameter range of the suture needle (usually 0.2-0.5 mm), it can be ensured that the pressure gradient distribution conforms to the law of metal plastic deformation. During the pressing process, local pressure is generated when the mold closes, causing the suture (usually a polymer material) to undergo thermoplastic deformation. The arc-shaped design of the top of the protrusion guides the material flow direction, forming a micro-concave structure on the inner wall of the needle hole.

[0007] Furthermore, the height range of the first and second protrusions is 20% to 25% of the diameter of the suture needle, not exceeding 0.3 mm.

[0008] Furthermore, the height of the first and second protrusions is 20% of the diameter of the suture needle. Since the suture needle needs to maintain hardness (e.g., stainless steel needle body hardness ≥ 500 HV) and resistance to deformation, experiments show that when the protrusion height exceeds 0.3 mm, the local stress during compression will exceed the yield strength of stainless steel (approximately 600 MPa), leading to plastic deformation or even cracking of the pinhole wall. The material mechanics formula calculates the local stress (σ = F / A). As the protrusion height increases, the contact area (A) decreases, and the local stress increases significantly. Therefore, it is necessary to balance the engagement depth and material stability by limiting the height. Experiments show that when the protrusion height exceeds 0.3 mm, the local stress during compression will exceed the yield strength of stainless steel (approximately 600 MPa), leading to plastic deformation or even cracking of the pinhole wall.

[0009] Furthermore, the width of the first and second protrusions ranges from 40% to 60% of the needle hole diameter of the suture needle.

[0010] Furthermore, the width of the first and second protrusions is 40% of the diameter of the suture needle hole. When the contact area covers the main stress area of ​​the needle hole (40%-60% from the center to the edge), the breaking strength is increased by 20%-40%, and the risk of slippage due to insufficient width (<40%) is avoided. The frictional force (F = μN) is positively correlated with the contact area. Covering 40%-60% of the hole diameter can maximize the effective friction area while preserving the structural strength of the needle hole edge.

[0011] Furthermore, the upper and lower molds are made of tungsten steel, which has extremely high hardness and can withstand high-intensity pressure without deformation, ensuring that the shape is maintained precisely during the pressing process.

[0012] A needle clamping machine comprising the aforementioned mold for enhancing the clamping stability of suture needles.

[0013] Furthermore, it also includes the main body of the needle clamping machine, on which a needle clamping machine head is fixed. A mold fixing block is detachably mounted on the needle clamping machine head. An upper mold and a lower mold are fixed on the mold fixing block. An upper micrometer is mounted above the upper mold, and a lower micrometer is mounted below the lower mold. The detachable mold fixing block design allows for quick installation and replacement of the upper and lower molds. Using standardized interfaces (such as snap-fits or positioning pins), mold switching can be completed within 30 seconds, adapting to the production needs of different specifications of suture needles. The upper micrometer (resolution 0.001mm) and lower micrometer are symmetrically arranged, forming a bidirectional pressure feedback system. By adjusting the advance and retreat of the micrometer (step accuracy ±0.005mm), the mold closing gap is dynamically controlled, ensuring that the deformation of the suture needle during the pressing process is precisely controlled within ±5μm.

[0014] Beneficial effects: Compared with the prior art, the advantages of the present invention are as follows:

[0015] (1) The present invention has raised points in the grooves of the upper and lower molds. During the pressing process, the raised points apply local high pressure to the pin hole wall, so that the suture is pressed into the pin hole wall to form a concave interlocking structure, which increases the mechanical locking effect. At the same time, the contact area is optimized. The raised points force the suture to be distributed in a wave shape in the pin hole, and the contact area is increased by 30%-50% compared with the traditional flat mold pressing. In addition, since the detachable installation method is adopted, the corresponding upper and lower molds can be prepared according to different suture needle diameters.

[0016] (2) The needle clamping machine designed in this invention combines modular mold design with a high-precision micrometer control system, and further realizes precision, flexibility and automation production while retaining the original mold to enhance clamping ability. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention;

[0018] Figure 2 This is a side view of the present invention;

[0019] Figure 3 This is a structural schematic diagram of Example 2;

[0020] Figure 4 This is a schematic diagram of the preparation method in Example 2. Detailed Implementation

[0021] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the embodiments described.

[0022] Example 1

[0023] like Figure 1 The mold shown is for enhancing the stability of suture needle clamping. It includes an upper mold 1 and a lower mold 2. The upper mold 1 has a first pressing groove 11 at the center of its bottom surface and a second pressing groove 21 at the center of its top surface. The first pressing groove 11 has a first protrusion 12 with an arc-shaped top surface at its center and the second pressing groove 21 has a second protrusion 22 with an arc-shaped top surface at its center. The height of the first protrusion 12 and the second protrusion 22 does not exceed the diameter of the suture needle, and the width of the first protrusion 12 and the second protrusion 22 does not exceed the diameter of the needle hole of the suture needle. When the first pressing groove 11 and the second pressing groove 21 are pressed together, they form a circular pressing hole. There is a gap between the first protrusion 12 and the second protrusion 22.

[0024] In this embodiment, the height of the first protrusion 12 and the second protrusion 22 is 20% of the diameter of the suture needle; the width of the first protrusion 12 and the second protrusion 22 is 40% of the diameter of the needle hole of the suture needle; the upper mold 1 and the lower mold 2 are made of tungsten steel.

[0025] Example 2

[0026] like Figure 3 The needle clamping machine shown includes a main body 6, on which a needle clamping head is fixed. A mold fixing block 5 is mounted on the needle clamping head via bolts and nuts. An upper mold 1 and a lower mold 2 are fixed to the mold fixing block 5. An upper micrometer 3 is mounted above the upper mold 1, and a lower micrometer 4 is mounted below the lower mold 2. When the suture needle model changes, the mold fixing block can be quickly replaced with an upper and lower mold that matches the current suture needle model. When the upper and lower molds are closed, the overall mold diameter is 90% of the current suture needle diameter.

[0027] like Figure 4As shown, the method for preparing the suture needle-thread connection is as follows:

[0028] Step 1: Prepare materials: Select suture needles 7 and sutures 8 that meet medical device standards to ensure their quality and safety.

[0029] Step 2, Mold Preparation: Based on the model of suture 8, prepare corresponding upper and lower molds with raised points. For example, for FJ-2229 reverse angle needle 1 / 2 arc · 98×17-26, the needle diameter of this suture is 0.98mm, and the diameter of the corresponding upper and lower mold positions for placing the needle is 0.88mm. Ensure that the size and position of the raised points meet the design requirements. Adjust the spacing between the upper and lower molds. Mold spacing standard: After starting the pressing operation, the upper and lower molds should be in a seamless, tightly closed state. After closing the molds, the upper and lower molds should naturally open. This is the spacing between the upper and lower molds. If there is a gap between the upper and lower molds after starting the pressing operation, the spacing between the upper and lower molds needs to be reduced so that the suture needle can be placed on the lower mold without pressure.

[0030] Step 3, threading: Place the end of the suture needle 7 with the hole in the same direction as the end of the mold notch on the lower mold, so that the suture thread 8 can pass through the mold notch into the suture needle when threading. The worker holds the suture thread 8 and aligns it with the needle hole of the suture needle, and inserts it into the needle hole to prepare for the subsequent pressing operation.

[0031] Step 4, Pressing Operation: Start the mold to press with a pressure of 20-30MPa for 2-3 seconds. The raised point will accurately act on the connection between the suture needle 7 and the suture 8, thereby increasing the contact area and local pressure.

[0032] Step 5, Quality Inspection: Perform quality inspection on the pressed surgical suture assembly to check whether the connection stability of the suture 8 and the shape of the suture needle 7 meet the requirements.

[0033] As described above, although the invention has been shown and described with reference to specific preferred embodiments, it should not be construed as limiting the invention itself. Various changes in form and detail may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A mold for enhancing the stability of a suture needle grip, characterized by: The upper die (1) and the lower die (2) are provided with a first pressing groove (11) in the middle of the bottom surface of the upper die (1) and a second pressing groove (21) in the middle of the top surface of the lower die (2), the middle of the first pressing groove (11) is provided with a first protruding point (12) with an arc-shaped top surface, the middle of the second pressing groove (21) is provided with a second protruding point (22) with an arc-shaped top surface, the height of the first protruding point (12) and the second protruding point (22) is not more than the diameter of the suture needle, the width of the first protruding point (12) and the second protruding point (22) is not more than the needle hole diameter of the suture needle, when the first pressing groove (11) and the second pressing groove (21) are pressed together, the first pressing groove (11) and the second pressing groove (21) form a circular pressing hole, and the first protruding point (12) and the second protruding point (22) have a gap therebetween.

2. The mold for enhancing the stability of a suture needle according to claim 1, wherein: The height of the first protruding point (12) and the second protruding point (22) ranges from 20% to 25% of the diameter of the suture needle, and is not more than 0.3 mm.

3. The mold for enhancing the stability of a suture needle according to claim 2, wherein: The height of the first protruding point (12) and the second protruding point (22) is 20% of the diameter of the suture needle.

4. The mold for enhancing the stability of a suture needle according to claim 1, wherein: The width of the first protruding point (12) and the second protruding point (22) ranges from 40% to 60% of the needle hole diameter of the suture needle.

5. The mold for enhancing the stability of a suture needle according to claim 4, wherein: The width of the first protruding point (12) and the second protruding point (22) is 40% of the needle hole diameter of the suture needle.

6. The mold for enhancing the stability of a suture needle according to claim 1, wherein: The materials of the upper die (1) and the lower die (2) are made of tungsten steel.

7. A pinching machine characterized by: The mold for enhancing the stability of the suture needle as claimed in any one of claims 1-6.

8. A pin chucking machine according to claim 7, characterized in that: The needle clamping machine body is further provided with a needle clamping machine head, a mold fixing block (5) is detachably installed on the needle clamping machine head, the upper die (1) and the lower die (2) are respectively fixed on the mold fixing block (5), an upper end micrometer (3) is installed above the upper die (1), and a lower end micrometer (4) is installed below the lower die (2).

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