Manufacturing method of running-firing ligation clip with built-in memory metal wire

Abstract

The invention discloses a manufacturing method of a continuous ligation clip with a built-in memory metal wire, which comprises the following steps of: grinding one end of an alloy wire into a cone shape, penetrating into a wire drawing die, penetrating the nickel-titanium shape memory alloy wire which is penetrated into the die into a tubular resistance furnace, and carrying out on-line annealing and cold drawing to a specific size. The method comprises the following steps of: performing shaping and punching treatment on a broken material, accurately placing a memory metal wire in a positioning structure of a mold before injection molding, injecting molten plastic into a mold cavity, wrapping the memory metal wire by the plastic in a flowing process, tightly combining the plastic with the memory metal wire, and opening the mold for demolding after the plastic is cooled and solidified after injection molding is finished. And the injection molded part is subjected to inspection and post-treatment, such as flash and burr removal, so that the product quality is ensured. Through the design of the built-in memory metal wire, the problem that the ligation clip cannot be normally opened even if the ligation clip is located in the continuous clip applier for a long time in an operation can be solved.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, in particular to a method for manufacturing a continuous hair ligation clip with built-in memory metal wire. Background Art

[0002] In minimally invasive surgery, ligation clips are often used to clamp tubular tissues of the human body. Ligation clips require special clamping instruments to be used in conjunction. The space of the abdominal wall puncture cannula used in minimally invasive surgery is small, and the structure of the continuous ligation clip is irregular. It is large in size in the natural relaxation state and cannot pass through the puncture cannula. It must pass through the puncture cannula in a compressed state and enter the body cavity before it can ligate and close the tubular tissues of the human body. The continuous ligation clip may be in a closed state for a long time inside the continuous clamp applicator. At this time, the ligation clip may not be opened and closed in time when used, resulting in accidents during surgery.

[0003] Therefore, it becomes a difficult problem how to pre-install the ligation clips in a reusable continuous clip applier to achieve regular arrangement, compress them when passing through the puncture cannula, restore them to a relaxed state when used for closure, and continuously deliver and effectively close them in sequence. Summary of the invention

[0004] The object of the present invention is to provide a method for manufacturing a continuous hair ligation clip with a built-in memory metal wire to solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the present invention adopts the following technical scheme: In order to achieve the above purpose, the present invention adopts the following technical scheme: grinding one end of the memory metal wire into a cone, inserting it into the wire drawing die, passing the memory metal wire through the die through the tubular resistance furnace, and then annealing and cold drawing online, repeating the above two steps until the memory alloy wire is cold drawn to the required size. The final finished product of the memory alloy wire is a circular cross section or a rectangular cross section with a central hole, the memory metal wire after the material is cut is shaped and punched, and the memory metal wire after the processing is cleaned, degreased and other surface treatments are performed to remove oil, impurities and oxides to ensure a good bonding interface, and the memory metal wire is accurately placed in the positioning structure of the mold before injection molding, and the molten plastic is injected into the mold cavity. The plastic wraps the memory metal wire during the flow process and is tightly combined with the memory metal wire. After the injection molding is completed, the plastic is cooled and solidified, and the mold is opened for demolding, and the injection molded parts are inspected and post-processed.

[0006] Furthermore, the deformation of the wire drawing die is 0~40%.

[0007] Furthermore, the temperature of the tubular resistance furnace is set at 600° C. to 800° C. for online annealing, and the cold drawing is performed to a wire arrangement speed of 0.5 to 5.0 m / min.

[0008] Furthermore, the diameter range of the circular cross section is 0.2 mm to 3.0 mm, and the size range of the rectangular cross section is 0.3×0.3 mm to 3.0×3.0 mm.

[0009] Furthermore, after the injection molding is completed, the formed shape includes a first clamp arm (100), a second clamp arm (200), and a connecting portion (300); the first clamp arm (100) and the second clamp arm (200) are connected via the connecting portion (300); a clamp head is provided at one end of the first clamp arm (100) away from the connecting portion (300); a hook is provided at one end of the second clamp arm (200) away from the connecting portion (300); the clamp head and the hook cooperate with each other to be detachably connected. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a perspective diagram of the ligation clip and memory wire.

[0011] Figure 2 Schematic diagram of memory wire.

[0012] Figure 3 This is a schematic diagram of the finished product of the ligation clip.

[0013] Among them, 100 is a first clamping arm, 200 is a second clamping arm, 300 is a connecting part, and 400 is a memory metal wire. DETAILED DESCRIPTION

[0014] The purpose of the present invention is to address the shortcomings of the existing oil depot and provide a method for manufacturing a continuous ligation clip with a built-in memory metal wire, which is specifically achieved by the following technical solutions: 1. Die insertion: Grind one end of the nickel-titanium shape memory wire 400 into a cone and insert it into a wire drawing die with a deformation amount of 0-40%. The initial diameter of the nickel-titanium shape memory wire 400 is 0.6mm-5.0mm. The wire drawing die can be a single die or a group of dies.

[0015] 2. Annealing and cold drawing: The nickel-titanium shape memory wire 400 wire that has been through the mold is passed through a tubular resistance furnace, and the temperature is set at 600℃~800℃ for online annealing and cold drawing to a specific size. The wire arrangement speed is 0.5~5.0m / min.

[0016] 3. Repeating steps: Repeat steps 1 and 2 until the nickel-titanium shape memory wire 400 is cold drawn to the desired size. The final product of the nickel-titanium shape memory wire 400 is a circular cross section or a rectangular cross section with a central hole. The diameter range of the circular cross section is 0.2 mm to 3.0 mm, and the size range of the rectangular cross section is 0.3×0.3 mm to 3.0×3.0 mm.

[0017] During the processing, due to the low plasticity of the nickel-titanium shape memory metal wire 400, it is usually necessary to process it at a high temperature to increase the plasticity, so the memory metal wire 400 after cutting is shaped and punched.

[0018] Finally, the shape memory effect is activated. When the memory metal wire 400 is stimulated, its shape memory effect can be activated. For the memory metal wire 400, the shape memory effect can be activated by temperature change or stress. The memory metal wire 400 of a certain model is cleaned, dried, and set aside.

[0019] After completing the preliminary preparation work for the memory metal wire 400, the casting of the ligation clip begins.

[0020] Reference Figure 1 , Figure 2 , Figure 3 ,First, the memory metal wire is cleaned and degreased to remove oil, impurities and oxides to ensure a good bonding interface.

[0021] Before injection molding, the memory metal wire is accurately placed in the positioning structure of the mold. The mold has a shape corresponding to the first clamp arm 100, the second clamp arm 200, and the connecting part 300, and there are positioning pins required to position the memory metal wire 400. The memory metal wire 400 is fixed from both sides. After the memory metal wire 400 is placed, the mold-related preparations are completed.

[0022] The molten plastic is injected into the mold cavity. The plastic wraps around the memory metal wire 400 during the flow process and is tightly combined with the memory metal wire 400 to form a first clamp arm 100 and a second clamp arm 200 connected by the connecting portion 300. A clamp head is provided at one end of the first clamp arm 100 away from the connecting portion 300, and a hook is provided at one end of the second clamp arm 200 away from the connecting portion 300. The clamp head and the hook cooperate with each other to form a detachable connection shape.

[0023] After the injection molding is completed, the plastic is cooled and solidified, and the mold is opened for demoulding. The injection molded parts are inspected and post-processed, such as removing flash and burrs, to ensure product quality.

[0024] Embodiment 1: In the first step, one end of the nickel-titanium shape memory wire 400 is ground into a cone and inserted into a wire drawing die with a deformation amount of 0-40%. The initial diameter of the nickel-titanium shape memory wire 400 is 0.6mm-5.0mm. According to the purchased nickel-titanium shape memory wire 400 wires of different sizes, wire drawing dies with different deformation amounts are selected. The larger the size, the larger the deformation amount that can be selected. If a wire drawing die with a large deformation amount is selected for a small-sized nickel-titanium shape memory wire 400 wire, there is a risk of breakage. The wire drawing die can be a single die or a group of dies.

[0025] The second step is annealing and cold drawing. The nickel-titanium shape memory wire 400 wire that has been through the mold is passed through a tubular resistance furnace, and the temperature is set at 600℃~800℃ for online annealing and cold drawing to a specific size. The wire arrangement speed is 0.5~5.0m / min. This temperature and wire arrangement speed are also selected according to the required cross-sectional diameter of the nickel-titanium shape memory wire 400 wire product. If the required cross-sectional diameter is smaller, select a high temperature and a higher wire arrangement speed.

[0026] Step 2: Repeat Step 1 and Step 2 until the nickel-titanium shape memory wire 400 is cold drawn to a desired size. The final product of the nickel-titanium shape memory wire 400 is a circular cross section or a rectangular cross section with a central hole, the diameter of the circular cross section ranges from 0.2 mm to 3.0 mm, and the size of the rectangular cross section ranges from 0.3×0.3 mm to 3.0×3.0 mm.

[0027] During the processing, due to the low plasticity of the nickel-titanium shape memory metal wire 400, it is usually necessary to process it at high temperature to increase the plasticity. Therefore, the memory metal wire 400 after cutting is shaped and punched. The larger the diameter of the raw material of the nickel-titanium shape memory metal wire 400, the denser the holes.

[0028] Finally, the shape memory effect is activated. When the memory metal wire 400 is stimulated, its shape memory effect can be activated. For the memory metal wire 400, the shape memory effect can be activated by changing temperature or stress. The memory metal wire 400 of a certain model is cleaned, degreased, and subjected to surface treatments such as removing oil, impurities, and oxides to ensure a good bonding interface.

[0029] Before injection molding, the memory metal wire 400 is accurately placed in the positioning structure of the mold, and the molten plastic is injected into the mold cavity. The plastic wraps around the memory metal wire 400 during the flow process and is tightly combined with the memory metal wire 400. After the injection molding is completed, the plastic is cooled and solidified, the mold is opened for demolding, and the injection molded parts are inspected and post-processed.

[0030] After demoulding, a continuous hair ligation clip with built-in memory metal wire is obtained, comprising a first clamp arm 100, a second clamp arm 200, and a connecting portion 300, wherein the first clamp arm 100 and the second clamp arm 200 are connected through the connecting portion 300, a through U-shaped hole is arranged in the middle of the connecting portion 300, a clamp head is arranged at one end of the first clamp arm 100 away from the connecting portion 300, a hook is arranged at one end of the second clamp arm 200 away from the connecting portion 300, the clamp head 101 and the hook 201 cooperate with each other to be detachably connected, and a plurality of anti-slip edges are arranged on the two surfaces of the first clamp arm 100 and the second clamp arm 200 facing each other. When a memory metal wire 400 with a circular cross-section and a diameter of 0.2 mm is placed in the first clamp arm 100, the second clamp arm 200, and the connecting portion 300, after 1000 continuous hair clipping operations, there are 5 times when the clips fail to open and close successfully, and the failure rate is 5‰.

[0031] Embodiment 2: In the first step, one end of the nickel-titanium shape memory wire 400 is ground into a cone and inserted into a wire drawing die with a deformation amount of 0-40%. The initial diameter of the nickel-titanium shape memory wire 400 is 0.6mm-5.0mm. According to the purchased nickel-titanium shape memory wire 400 wires of different sizes, wire drawing dies with different deformation amounts are selected. The larger the size, the larger the deformation amount that can be selected. If a wire drawing die with a large deformation amount is selected for a small-sized nickel-titanium shape memory wire 400 wire, there is a risk of breakage. The wire drawing die can be a single die or a group of dies.

[0032] The second step is annealing and cold drawing. The nickel-titanium shape memory wire 400 wire that has been through the mold is passed through a tubular resistance furnace, and the temperature is set at 600℃~800℃ for online annealing and cold drawing to a specific size. The wire arrangement speed is 0.5~5.0m / min. This temperature and wire arrangement speed are also selected according to the required cross-sectional diameter of the nickel-titanium shape memory wire 400 wire product. If the required cross-sectional diameter is smaller, select a high temperature and a higher wire arrangement speed.

[0033] Step 2: Repeat Step 1 and Step 2 until the nickel-titanium shape memory wire 400 is cold drawn to a desired size. The final product of the nickel-titanium shape memory wire 400 is a circular cross section or a rectangular cross section with a central hole, the diameter of the circular cross section ranges from 0.2 mm to 3.0 mm, and the size of the rectangular cross section ranges from 0.3×0.3 mm to 3.0×3.0 mm.

[0034] During the processing, due to the low plasticity of the nickel-titanium shape memory metal wire 400, it is usually necessary to process it at high temperature to increase the plasticity. Therefore, the memory metal wire 400 after cutting is shaped and punched. The larger the diameter of the raw material of the nickel-titanium shape memory metal wire 400, the denser the holes.

[0035] Finally, the shape memory effect is activated. When the memory metal wire 400 is stimulated, its shape memory effect can be activated. For the memory metal wire 400, the shape memory effect can be activated by changing temperature or stress. The memory metal wire 400 of a certain model is cleaned, degreased, and subjected to surface treatments such as removing oil, impurities, and oxides to ensure a good bonding interface.

[0036] Before injection molding, the memory metal wire 400 is accurately placed in the positioning structure of the mold, and the molten plastic is injected into the mold cavity. The plastic wraps around the memory metal wire 400 during the flow process and is tightly combined with the memory metal wire 400. After the injection molding is completed, the plastic is cooled and solidified, the mold is opened for demolding, and the injection molded parts are inspected and post-processed.

[0037] After demoulding, a continuous hair ligation clip with built-in memory metal wire is obtained, comprising a first clamp arm 100, a second clamp arm 200, and a connecting portion 300, wherein the first clamp arm 100 and the second clamp arm 200 are connected through the connecting portion 300, a through U-shaped hole is arranged in the middle of the connecting portion 300, a clamp head is arranged at one end of the first clamp arm 100 away from the connecting portion 300, a hook is arranged at one end of the second clamp arm 200 away from the connecting portion 300, the clamp head 101 and the hook 201 cooperate with each other to be detachably connected, and a plurality of anti-slip edges are arranged on the two surfaces of the first clamp arm 100 and the second clamp arm 200 facing each other. When a memory metal wire 400 with a circular cross-section and a diameter of 0.5 mm is placed in the first clamp arm 100, the second clamp arm 200, and the connecting portion 300, after 1000 continuous hair clipping operations, there are 2 times when the clips fail to open and close successfully, and the failure rate is 2‰.

[0038] Embodiment 3: In the first step, one end of the nickel-titanium shape memory wire 400 is ground into a cone and inserted into a wire drawing die with a deformation amount of 0-40%. The initial diameter of the nickel-titanium shape memory wire 400 is 0.6mm-5.0mm. According to the purchased nickel-titanium shape memory wire 400 wires of different sizes, wire drawing dies with different deformation amounts are selected. The larger the size, the larger the deformation amount that can be selected. If a wire drawing die with a large deformation amount is selected for a small-sized nickel-titanium shape memory wire 400 wire, there is a risk of breakage. The wire drawing die can be a single die or a group of dies.

[0039] The second step is annealing and cold drawing. The nickel-titanium shape memory wire 400 wire that has been through the mold is passed through a tubular resistance furnace, and the temperature is set at 600℃~800℃ for online annealing and cold drawing to a specific size. The wire arrangement speed is 0.5~5.0m / min. This temperature and wire arrangement speed are also selected according to the required cross-sectional diameter of the nickel-titanium shape memory wire 400 wire product. If the required cross-sectional diameter is smaller, select a high temperature and a higher wire arrangement speed.

[0040] Step 2: Repeat Step 1 and Step 2 until the nickel-titanium shape memory wire 400 is cold drawn to a desired size. The final product of the nickel-titanium shape memory wire 400 is a circular cross section or a rectangular cross section with a central hole, the diameter of the circular cross section ranges from 0.2 mm to 3.0 mm, and the size of the rectangular cross section ranges from 0.3×0.3 mm to 3.0×3.0 mm.

[0041] During the processing, due to the low plasticity of the nickel-titanium shape memory metal wire 400, it is usually necessary to process it at high temperature to increase the plasticity. Therefore, the memory metal wire 400 after cutting is shaped and punched. The larger the diameter of the raw material of the nickel-titanium shape memory metal wire 400, the denser the holes.

[0042] Finally, the shape memory effect is activated. When the memory metal wire 400 is stimulated, its shape memory effect can be activated. For the memory metal wire 400, the shape memory effect can be activated by changing temperature or stress. The memory metal wire 400 of a certain model is cleaned, degreased, and subjected to surface treatments such as removing oil, impurities, and oxides to ensure a good bonding interface.

[0043] Before injection molding, the memory metal wire 400 is accurately placed in the positioning structure of the mold, and the molten plastic is injected into the mold cavity. The plastic wraps around the memory metal wire 400 during the flow process and is tightly combined with the memory metal wire 400. After the injection molding is completed, the plastic is cooled and solidified, the mold is opened for demolding, and the injection molded parts are inspected and post-processed.

[0044] After demoulding, a continuous hair ligation clip with built-in memory metal wire is obtained, comprising a first clamp arm 100, a second clamp arm 200, and a connecting portion 300, wherein the first clamp arm 100 and the second clamp arm 200 are connected through the connecting portion 300, a through U-shaped hole is arranged in the middle of the connecting portion 300, a clamp head is arranged at one end of the first clamp arm 100 away from the connecting portion 300, a hook is arranged at one end of the second clamp arm 200 away from the connecting portion 300, the clamp head 101 and the hook 201 cooperate with each other to be detachably connected, and a plurality of anti-slip edges are arranged on the two surfaces of the first clamp arm 100 and the second clamp arm 200 facing each other. When a memory metal wire 400 with a circular cross-section and a diameter of 1 mm is placed in the first clamp arm 100, the second clamp arm 200, and the connecting portion 300, after 1000 continuous hair clipping operations, no situation of the clip failing to open and close successfully occurs.

[0045] Embodiment 4: In the first step, one end of the nickel-titanium shape memory wire 400 is ground into a cone and inserted into a wire drawing die with a deformation amount of 0-40%. The initial diameter of the nickel-titanium shape memory wire 400 is 0.6mm-5.0mm. According to the purchased nickel-titanium shape memory wire 400 wires of different sizes, wire drawing dies with different deformation amounts are selected. The larger the size, the larger the deformation amount that can be selected. If a wire drawing die with a large deformation amount is selected for a small-sized nickel-titanium shape memory wire 400 wire, there is a risk of breakage. The wire drawing die can be a single die or a group of dies.

[0046] The second step is annealing and cold drawing. The nickel-titanium shape memory wire 400 wire that has been through the mold is passed through a tubular resistance furnace, and the temperature is set at 600℃~800℃ for online annealing and cold drawing to a specific size. The wire arrangement speed is 0.5~5.0m / min. This temperature and wire arrangement speed are also selected according to the required cross-sectional diameter of the nickel-titanium shape memory wire 400 wire product. If the required cross-sectional diameter is smaller, select a high temperature and a higher wire arrangement speed.

[0047] Step 2: Repeat Step 1 and Step 2 until the nickel-titanium shape memory wire 400 is cold drawn to a desired size. The final product of the nickel-titanium shape memory wire 400 is a circular cross section or a rectangular cross section with a central hole, the diameter of the circular cross section ranges from 0.2 mm to 3.0 mm, and the size of the rectangular cross section ranges from 0.3×0.3 mm to 3.0×3.0 mm.

[0048] During the processing, due to the low plasticity of the nickel-titanium shape memory metal wire 400, it is usually necessary to process it at high temperature to increase the plasticity. Therefore, the memory metal wire 400 after cutting is shaped and punched. The larger the diameter of the raw material of the nickel-titanium shape memory metal wire 400, the denser the holes.

[0049] Finally, the shape memory effect is activated. When the memory metal wire 400 is stimulated, its shape memory effect can be activated. For the memory metal wire 400, the shape memory effect can be activated by changing temperature or stress. The memory metal wire 400 of a certain model is cleaned, degreased, and subjected to surface treatments such as removing oil, impurities, and oxides to ensure a good bonding interface.

[0050] Before injection molding, the memory metal wire 400 is accurately placed in the positioning structure of the mold, and the molten plastic is injected into the mold cavity. The plastic wraps around the memory metal wire 400 during the flow process and is tightly combined with the memory metal wire 400. After the injection molding is completed, the plastic is cooled and solidified, the mold is opened for demolding, and the injection molded parts are inspected and post-processed.

[0051] After demoulding, a continuous hair ligation clip with built-in memory metal wire is obtained, comprising a first clamp arm 100, a second clamp arm 200, and a connecting portion 300, wherein the first clamp arm 100 and the second clamp arm 200 are connected through the connecting portion 300, a through U-shaped hole is arranged in the middle of the connecting portion 300, a clamp head is arranged at one end of the first clamp arm 100 away from the connecting portion 300, a hook is arranged at one end of the second clamp arm 200 away from the connecting portion 300, the clamp head 101 and the hook 201 cooperate with each other to be detachably connected, and a plurality of anti-slip edges are arranged on the two surfaces of the first clamp arm 100 and the second clamp arm 200 facing each other. When a memory metal wire 400 with a circular cross-section and a diameter of 1.5 mm is placed in the first clamp arm 100, the second clamp arm 200, and the connecting portion 300, after 1000 continuous hair clipping operations, no situation of the clip failing to open and close successfully occurs.

[0052] Embodiment 5: In the first step, one end of the nickel-titanium shape memory wire 400 is ground into a cone and inserted into a wire drawing die with a deformation amount of 0-40%. The initial diameter of the nickel-titanium shape memory wire 400 is 0.6mm-5.0mm. According to the purchased nickel-titanium shape memory wire 400 wires of different sizes, wire drawing dies with different deformation amounts are selected. The larger the size, the larger the deformation amount that can be selected. If a wire drawing die with a large deformation amount is selected for a small-sized nickel-titanium shape memory wire 400 wire, there is a risk of breakage. The wire drawing die can be a single die or a group of dies.

[0053] The second step is annealing and cold drawing. The nickel-titanium shape memory wire 400 wire that has been through the mold is passed through a tubular resistance furnace, and the temperature is set at 600℃~800℃ for online annealing and cold drawing to a specific size. The wire arrangement speed is 0.5~5.0m / min. This temperature and wire arrangement speed are also selected according to the required cross-sectional diameter of the nickel-titanium shape memory wire 400 wire product. If the required cross-sectional diameter is smaller, select a high temperature and a higher wire arrangement speed.

[0054] Step 2: Repeat Step 1 and Step 2 until the nickel-titanium shape memory wire 400 is cold drawn to a desired size. The final product of the nickel-titanium shape memory wire 400 is a circular cross section or a rectangular cross section with a central hole, the diameter of the circular cross section ranges from 0.2 mm to 3.0 mm, and the size of the rectangular cross section ranges from 0.3×0.3 mm to 3.0×3.0 mm.

[0055] During the processing, due to the low plasticity of the nickel-titanium shape memory metal wire 400, it is usually necessary to process it at high temperature to increase the plasticity. Therefore, the memory metal wire 400 after cutting is shaped and punched. The larger the diameter of the raw material of the nickel-titanium shape memory metal wire 400, the denser the holes.

[0056] Finally, the shape memory effect is activated. When the memory metal wire 400 is stimulated, its shape memory effect can be activated. For the memory metal wire 400, the shape memory effect can be activated by changing temperature or stress. The memory metal wire 400 of a certain model is cleaned, degreased, and subjected to surface treatments such as removing oil, impurities, and oxides to ensure a good bonding interface.

[0057] Before injection molding, the memory metal wire 400 is accurately placed in the positioning structure of the mold, and the molten plastic is injected into the mold cavity. The plastic wraps around the memory metal wire 400 during the flow process and is tightly combined with the memory metal wire 400. After the injection molding is completed, the plastic is cooled and solidified, the mold is opened for demolding, and the injection molded parts are inspected and post-processed.

[0058] After demoulding, a continuous hair ligation clamp with built-in memory metal wire is obtained, comprising a first clamp arm 100, a second clamp arm 200, and a connecting portion 300, wherein the first clamp arm 100 and the second clamp arm 200 are connected through the connecting portion 300, a through U-shaped hole is arranged in the middle of the connecting portion 300, a clamp head is arranged at one end of the first clamp arm 100 away from the connecting portion 300, a hook is arranged at one end of the second clamp arm 200 away from the connecting portion 300, the clamp head 101 and the hook 201 cooperate with each other and can be detachably connected, and a plurality of anti-slip edges are arranged on two surfaces of the first clamp arm 100 and the second clamp arm 200 facing each other. When a memory wire 400 with a circular cross-section and a diameter of 3 mm is placed in the first clamp arm 100, the second clamp arm 200, and the connecting part 300, after 1000 consecutive clamping operations, there is no situation where the clamp fails to open and close successfully. However, at this time, the defective rate of defective products in the casting of the ligation clamp is greatly increased. Since the memory wire 400 has a large weight and an increased volume, the memory wire 400 cannot be completely wrapped by the outside of the ligation clamp.

[0059] After testing, it was found that there was no significant difference between the use of the rectangular cross-section memory wire 400 and the circular cross-section memory wire 400 in the use of the ligation clip.

Claims

1. A method for manufacturing a continuous hair ligation clip with a built-in memory metal wire, characterized in that: The first step is to grind one end of the memory metal wire into a cone shape and insert it into the wire drawing die. In the second step, the memory metal wire that has been pierced through the mold is passed through a tubular resistance furnace, and then annealed and cold drawn online. Repeat the above two steps until the memory alloy wire is cold drawn to the required size. The final product of the memory alloy wire is a circular cross section or a rectangular cross section with a center hole. The third step is to shape and punch the memory metal wire (400) after cutting. The fourth step is to perform surface treatment such as cleaning and degreasing on the processed memory metal wire (400) to remove oil, impurities and oxides to ensure a good bonding interface. The fifth step is to accurately place the memory metal wire (400) into the positioning structure of the mold before injection molding. In the sixth step, the molten plastic is injected into the mold cavity. The plastic wraps around the memory metal wire (400) during the flow process and is tightly combined with the memory metal wire (400). Step 7. After the injection molding is completed, wait for the plastic to cool and solidify, open the mold for demoulding, and inspect and post-process the injection molded parts.

2. The method for manufacturing a continuous hair ligation clip with a built-in memory metal wire according to claim 1, characterized in that: The deformation of the wire drawing die is 0~40%.

3. The method for manufacturing a continuous hair ligation clip with a built-in memory metal wire according to claim 1, characterized in that: The temperature of the tubular resistance furnace is set at 600℃~800℃ for online annealing, and the wire arrangement speed during cold drawing is 0.5~5.0m / min.

4. The method for manufacturing a continuous hair ligation clip with a built-in memory metal wire according to claim 1, characterized in that: The diameter range of the circular cross section is 0.2mm~3.0mm, and the size range of the rectangular cross section is 0.3×0.3mm~3.0×3.0mm.

5. The method for manufacturing a continuous hair ligation clip with a built-in memory metal wire according to claim 1, characterized in that: After the injection molding is completed, the formed shape includes a first clamp arm (100), a second clamp arm (200), and a connecting portion (300). The first clamp arm (100) and the second clamp arm (200) are connected via a connecting portion (300). A clamping head is provided at one end of the first clamping arm (100) away from the connecting portion (300). A hook is provided at one end of the second clamping arm (200) away from the connecting portion (300). The clamp head and the clamp hook cooperate with each other to be detachably connected.

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