Needle knife with plastic handle

Abstract

The utility model discloses a needle knife with a plastic handle, and belongs to the field of medical instruments. The needle knife comprises a needle knife body and a plastic tube handle, the head end of the needle knife body is a needle knife edge, one end of the plastic tube handle is provided with a navigation structure, and the structural surface of the navigation structure and the edge surface of the needle knife edge face the same direction; the flat navigation structure can help a doctor determine the direction of the cutting edge of the needle knife, and the fixed end of the needle knife body is fixedly connected with the plastic tube handle through a condensation welding fixing structure or is fixedly connected with the plastic tube handle in a mechanical mode or a dispensing mode. In the high-temperature flattening process of the navigation structure, the contact section of the needle knife body and the high-temperature softened plastic pipe handle can be embedded into the inner wall of the plastic pipe handle, the axial inner hole shrinks to clamp the needle knife body in the inner hole, the needle knife body is fixedly connected with the plastic pipe handle, and continuous assembly automatic production can be achieved. According to the plastic handle needle knife produced in the assembly mode, the technical problems that an existing plastic handle needle knife manufactured in a one-time forming injection molding mode is high in cost, low in production efficiency and the like are solved.

Description

Technical Field

[0001] The utility model relates to the field of medical instruments, in particular to a needle knife with a plastic handle. Background Art

[0002] Acupuncture knife is a therapeutic needle with a flat blade. Currently, acupuncture knives on the market are divided into two categories: metal handle needle knives and plastic handle needle knives. One end of the metal handle needle knives is flattened by stamping equipment to achieve the function of connecting the needle handle and the needle knife body. The plastic handle needle knives are molded by one-time injection molding.

[0003] The above two types of needle knife production have the following technical problems:

[0004] In the processing of metal handle needle knives, stamping metal requires a special stamping die, and it consumes more metal, so the production cost is also higher;

[0005] The plastic handle needle knife produced by one-piece injection molding also requires a special mold for one-piece molding. Due to the small size of the product, the yield rate is not high, the batch production efficiency is low, and the equipment investment cost is high, resulting in high production costs. Utility Model Content

[0006] 1. Technical problems to be solved by the utility model

[0007] In view of the problems of high production cost and low production efficiency of traditional Chinese medicine needle knives with metal handles or plastic handles in the prior art, the utility model provides a plastic handle needle knife, which fully utilizes the navigation structure of the plastic handle needle knife, and fixes the fixed end of the needle knife body to the plastic tube handle through a fixed structure or mechanically or by gluing, so that it can be mass-produced automatically with low cost and high efficiency.

[0008] 2. Technical solution

[0009] In order to achieve the above-mentioned purpose, the technical solution provided by the utility model is:

[0010] A needle knife with a plastic handle comprises a needle knife body and a plastic tube handle, both of which are mass-produced separately; the head end of the needle knife body is a needle knife cutting edge, and a navigation structure is arranged at one end of the plastic tube handle, wherein the structural surface of the navigation structure is in accordance with the surface of the cutting edge of the needle knife; the navigation structure can be formed by mass-flattening one end of the plastic tube handle through a high-temperature mold, and the flat navigation structure can help doctors determine the direction of the needle knife cutting edge; the fixed end of the needle knife body is fixedly connected to the plastic tube handle through a fixed structure, and during the high-temperature flattening process, the navigation structure can embed the contact section of the needle knife body with the high-temperature softened plastic tube handle into the inner wall of the plastic tube handle, and after cooling, a condensation fixed structure is formed, and the needle knife body and the plastic tube handle are mass-fixedly connected, the connection is firm, and the manufacturing cost is reduced.

[0011] For the plastic tube handle (not limited to the plastic tube handle produced by extrusion), the needle knife body and the navigation structure can also be assembled and connected by dispensing UV light-curing glue to achieve a dispensing-type fixed structure. The needle knife body and the needle knife plastic tube handle can also be assembled and connected by a mechanical fixed structure by pressing the fixed end of the needle knife body into a wave bend and then pulling it into the plastic tube handle, clamping the needle knife body at the navigation structure with the wave bend, or clamping the needle knife body at the navigation structure with roughening.

[0012] A further technical solution is that the fixed end of the needle knife body is bent into a bending section, and the tail end point of the bending section, the protruding point and / or the contact point between the needle knife body and the navigation structure are welded at high temperature and cooled to form a condensation fixed structure. A condensation fixed structure with a single, double or even multiple cold-solidification points can be formed to fix the needle knife body to the plastic tube handle. The fixed end of the needle knife body can be partially roughened or frosted to improve the connection strength.

[0013] A further technical solution is that the navigation structure is a vertically symmetrical inclined surface, step surface or flattened surface structure, which has an obvious structure, facilitates the determination of the direction of the cutting edge of the needle knife, and also facilitates acupuncture and saves effort.

[0014] A further technical solution is that a part of the fixed end of the needle knife body is a wavy bend, and the protruding points of the wavy bend and the contact points between the needle knife body and the navigation structure are cooled through high-temperature welding to form a multi-point fixed structure. The wavy bend can be wavy or serrated, further improving the welding strength.

[0015] According to a further technical solution, high temperature welding is high frequency welding, ultrasonic welding, microwave welding or laser welding.

[0016] A method for manufacturing a needle knife with a plastic handle, wherein one end of a plastic tube handle is pressed out to form a navigation structure after a high-temperature upper and lower mold are closed, and a contact point between the needle knife body and the navigation structure is formed after high-temperature cooling, which is suitable for when there is a slight difference between the diameter of the needle knife body and the inner diameter of the plastic tube handle, and the single cold solidification point structure can achieve the purpose of firm welding.

[0017] A further production method further comprises the steps of:

[0018] S1. Insert the needle knife body into the plastic tube handle, and the tail end of the needle knife body extends out of the tube opening of the plastic tube handle;

[0019] S2, bending the portion of the tail end of the needle cutter body extending out of the plastic tube handle into a bent section;

[0020] S3, push the bent section into the plastic pipe handle;

[0021] S4. The fixed ends of the plastic tube handle and the needle knife body are subjected to high-temperature welding. After the tail end point and the convex point of the bending section are cooled by high-temperature welding, the contact points with the plastic tube handle form cold-solidification point three and cold-solidification point two respectively.

[0022] A further preparation method comprises the following steps:

[0023] The fixed end of the needle knife body is partially bent into a wave shape;

[0024] Push the wave bend into the plastic pipe handle close to the navigation structure;

[0025] One end of the plastic tube handle is squeezed out of the navigation structure after the upper and lower molds are closed at high temperature. At the same time, the contact point between the needle knife body and the navigation structure forms a cold solid point after being cooled from high temperature.

[0026] A further production method further comprises the steps of:

[0027] The plastic tube handle and the fixed end of the needle knife body are subjected to high temperature welding. After the convex points of the wave bend are cooled by high temperature welding, a plurality of cold solidification points 2 are formed at the contact points with the plastic tube handle.

[0028] A plastic-handled needle knife with a needle insertion tube comprises a needle insertion tube and the above-mentioned plastic-handled needle knife, the plastic tube handle is fixedly connected to the inner wall of the needle insertion tube, and a spacing is reserved between the needle knife blade and the free end port of the plastic tube handle, that is, the needle knife blade is retracted into the axial inner hole of the plastic tube handle.

[0029] 3. Beneficial effects

[0030] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects:

[0031] (1) The plastic handle needle knife of the utility model makes full use of the relatively easy positioning of the molten plastic material of the plastic tube handle itself and the navigation structure set at one end of the plastic tube handle. During the high-temperature flattening process of the navigation structure, the contact section between the needle knife body and the high-temperature softened plastic tube handle can be embedded in the inner wall of the plastic tube handle. After cooling, a condensation fixing structure is formed to fix the needle knife body and the plastic tube handle. The connection is firm, which reduces the manufacturing cost; the assembly process is simple, and the investment and manufacturing costs are low;

[0032] (2) The plastic handle needle knife of the utility model, the bending section of the fixed end of the needle knife body cooperates with the navigation structure to form a fixed structure with a single, double or even multiple cold fixation points, and the needle knife body is fixedly connected to the plastic tube handle, further improving the connection strength;

[0033] (3) For the plastic-handled needle knife of the utility model, when the fixed end of the needle knife body is partially wavy, the convex points of the wavy bend and the contact points of the bending section of the needle knife body and the navigation structure can form a multi-point fixed structure after high-temperature welding and cooling. The wavy bend can be wavy or zigzag, which can further improve the welding strength;

[0034] (4) The plastic-handled needle knife of the utility model, when pressing the navigation structure, does not require a lot of force during extrusion because the plastic softens under heat, has low requirements on mold materials, does not need to use expensive mold-specific materials, and does not need to use special stamping equipment because of the small force, and can be extruded by using a cylinder to drive the extrusion head;

[0035] (5) In the plastic-handled needle knife of the present invention, the navigation structure can be located at the head end or the tail end of the needle handle, and the position is not limited. The shape of the navigation structure can be a vertically symmetrical inclined surface, a stepped surface, or a flattened surface structure.

[0036] (6) The plastic-handled needle knife with a needle insertion tube of the present invention does not need to be fixed with an insert like the existing metal-handled needle knife and plastic-handled needle knife with a needle insertion tube on the market. The plastic-handled needle knife of the present invention is welded to the needle insertion tube and can be removed by one-hand operation. The operation is simple and convenient and will not cause garbage pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a structural schematic diagram of a plastic-handled needle knife according to a specific embodiment;

[0038] Figure 2 for Figure 1 Side view of

[0039] Figure 3 It is a schematic diagram of the manufacturing process of the plastic-handled needle knife of a specific embodiment;

[0040] Figure 4 It is a schematic diagram of a batch high-frequency welding process of a plastic-handled needle knife according to a specific embodiment;

[0041] Figure 5 It is a structural schematic diagram of a plastic-handled needle knife according to a specific embodiment;

[0042] Figure 6 for Figure 5 Side view of

[0043] Figure 7 It is a schematic diagram of a high temperature extrusion die for processing a navigation structure in a specific embodiment;

[0044] Figure 8 for Figure 7 Schematic diagram of the enlarged E part;

[0045] Fig. 9 A schematic diagram of the structure of a needle knife with a plastic handle according to a specific embodiment;

[0046] Fig.10 for Fig. 9 Side view of

[0047] Fig.11 This is a schematic diagram of a state where an ultrasonic welding device is welding a plastic-handled needle knife according to a specific embodiment;

[0048] Fig.12 for Fig.11 Schematic diagram of the structure after the B part is enlarged;

[0049] Fig.13 This is a schematic diagram of the structure of a needle knife with a needle tube in a specific embodiment;

[0050] Fig.14 It is a schematic diagram of the state of welding a plastic-handled needle knife by a microwave welding device according to a specific embodiment;

[0051] Fig.15 for Fig.14 Schematic diagram of the enlarged C part;

[0052] Fig.16 This is a schematic diagram of a state where a laser welding device is welding a plastic-handled needle knife in a specific embodiment;

[0053] Fig.17 for Fig.16 Schematic diagram of the structure after the F part is enlarged;

[0054] Fig.18 The schematic diagram of the plastic handle needle knife structure with the navigation structure at the tail end;

[0055] Fig.19 for Fig.18 Side view of

[0056] Fig. 20 The schematic diagram of the plastic handle needle knife structure with the navigation structure at the tail end;

[0057] Fig.21 for Fig. 20 Side view of

[0058] Fig. 22 This is a schematic diagram of the structure of a plastic-handled needle knife with a needle tube after ultrasonic welding;

[0059] Fig.23 This is a schematic diagram of the plastic handle needle knife structure with a glue-dispensing fixed structure.

[0060] In the figure: 1-needle knife body; 2-plastic pipe handle; 3-fixing structure; 4-high temperature extrusion mold; 5-high frequency welding device; 6-needle insertion catheter; 7-ultrasonic welding device; 8-microwave welding device; 9-laser welding device; 10-glue dispensing point; 11-needle knife edge; 12-bending section; 13-wave bend; 21-navigation structure; 23-microwave heating section; 31-cold solidification point one; 32-cold solidification point two; 33-cold solidification point three; 41-upper mold; 42-lower mold; 51-conveyor belt; 52-high frequency coil; 61-welding micropore; 62-welding point; 71-welding head tip; 72-ultrasonic welding micropore; 81-microwave magnetron; 82-waveguide tube; 91-laser beam; 100-needle knife with plastic handle to be welded; 200-needle knife with welded plastic handle. DETAILED DESCRIPTION

[0061] In order to further understand the content of the utility model, the utility model is described in detail with reference to the accompanying drawings.

[0062] Example 1

[0063] The plastic handle needle knife of the present embodiment, Figure 1 , 2 As shown, it includes a needle knife body 1 and a plastic tube handle 2. The needle knife body 1 is generally made of medical stainless steel wire. The production of the plastic tube handle 2 can be applied to both injection molding and extrusion molding. The head end of the needle knife body 1 is a needle knife edge 11. One end of the plastic tube handle 2 is provided with a navigation structure 21. The navigation structure 21 can be provided on the plastic tube handle 2 as shown in FIG. Figure 1 , 2 , 5, 6, 9, 10 or as shown in the head end Figure 18-21 The tail end shown in the figure can of course be set at both ends. Generally, only one end is required; the structural surface of the navigation structure 21 is consistent with the orientation of the blade surface of the needle knife edge 11, and the orientation of the relatively large flat structural surface of the navigation structure 21 can help the doctor determine the orientation of the relatively small blade surface of the needle knife edge 11; the structural surface of the navigation structure 21 can be symmetrical up and down as shown in the figure. Figure 1 , 2 The inclined surface shown, such as Figure 5 , 6 As shown in the step surface, or as Fig. 9 , 10 The flattening surface structure shown in the figure; the fixed end of the needle knife body 1 is fixedly connected to the plastic tube handle 2 through the fixing structure 3. During the high-temperature flattening process, the contact section of the needle knife body 1 and the high-temperature softened plastic tube handle 2 can be embedded in the inner wall of the plastic tube handle 2, and a condensation fixing structure is formed after cooling, so that the needle knife body 1 and the plastic tube handle 2 can be fixedly connected in batches, and the connection is firm, which reduces the production cost.

[0064] like Fig.23As shown, the fixed structure 3 can be connected to the needle knife body 1 and the navigation structure 21 by dispensing ultraviolet light-cured glue, and the glue can be used to penetrate and fill the gap at the dispensing point 10 between the navigation structure 21 and the needle knife body 1 by its own weight, and the two are fixedly connected after being cured by ultraviolet light; in order to make full use of the elasticity of the wave bend 13 and the flat shape of the navigation structure 21, the needle knife body 1 and the needle knife plastic tube handle 2 can also be mechanically fixed The structure is tightly assembled and connected by pressing the fixed end of the needle knife body 1 against the wave bend 13 and then pulling it into the plastic tube handle 2, the needle knife body 1 is tightly clamped with the wave bend at the navigation structure 21, or the needle knife body 1 is tightly clamped with roughening at the navigation structure 21.

[0065] The condensation fixing structure, the dispensing fixing structure and the mechanical fixing structure can all realize automated batch assembly production, which greatly reduces the production cost compared with the existing medical metal handle needle knives or integrated plastic handle needle knives. Among the three fixing structures, since there is no way to embed fixation, the connection strength of the mechanical fixing structure assembly connection is lower than that of the condensation fixing structure. The condensation fixing structure can be preferred to reduce costs while having a high fixed connection strength.

[0066] In order to improve the connection strength, the manufacturing method of the plastic handle needle knife of this embodiment is as follows: a section close to the head end or tail end of the plastic tube handle 2 is extruded into the navigation structure 21 through the upper mold 41 and the lower mold 42 of the high-temperature extrusion mold 4, and the contact point between the needle knife body 1 and the navigation structure 21 is formed into an embedded cold solidification point 31 after high-temperature cooling. It is suitable for when the diameter of the needle knife body 1 is slightly different from the inner diameter of the plastic tube handle 2. The single cold solidification point structure can achieve the purpose of firm welding. The mold surfaces of the upper mold 41 and the lower mold 42 are adapted to the structural surface of the navigation structure 21, that is, the mold cavity shape after the upper mold 41 and the lower mold 42 are combined is adapted to the inclined surface, stepped surface or flattened surface of the navigation structure 21;

[0067] In the plastic handle needle knife of this embodiment, the navigation structure 21 can embed the contact section of the needle knife body 1 and the high temperature softened plastic tube handle 2 into the inner wall of the plastic tube handle 2 during the high temperature flattening process of the high temperature extrusion mold 4, and form a cold solid point 31 after cooling, so that the needle knife body 1 and the plastic tube handle 2 are condensed and fixedly connected, and the connection is firm, which reduces the production cost.

[0068] like Figure 7 , 8 As shown, the high temperature extrusion die 4 includes a welding head, and the welding head includes an upper die 41 and a lower die 42 that are arranged in a coordinated manner.

[0069] When a high-temperature extrusion die 4 is used, the welding head upper die 41 and the welding head lower die 42 of the welding tool generate electrical heating. When the welding head upper die 41 and the welding head lower die 42 contact the outer wall of the plastic tube handle 2, the contact welding head upper die 41 and the welding head lower die 42 heat the clamping part of the plastic tube handle 2. After the temperature rises to reach the melting point of the plastic, soft melting occurs. The welding head upper die 41 and the welding head lower die 42 deform the clamping part of the plastic tube handle 2 wall to generate a navigation structure 21. At the same time, the axial inner hole of the plastic tube handle 2 shrinks and clamps the needle knife body 1 in the inner hole, and an embedded cold solid point 31 is formed after cooling.

[0070] Example 2

[0071] The plastic-handled needle knife of this embodiment has the same basic structure as that of embodiment 1, with the difference and improvement being that a part of the needle knife body 1 has a roughened, frosted or flattened surface after being roughened, frosted or flattened. The roughened, frosted or flattened surface is generally arranged at the fixed section with the needle knife body 1 to increase the connection surface and friction with the cold solid point 31, thereby further improving the firmness of the fixed connection.

[0072] Example 3

[0073] The basic structure of the plastic handle needle knife in this embodiment is the same as that in embodiment 2, except that: Figure 1 , 2 As shown, the fixed end of the needle knife body 1 is bent into a bending section 12, and the tail end point of the bending section 12, the protruding point and / or the contact point of the needle knife body 1 and the navigation structure 21 are welded at high temperature and cooled to form a fixed structure 3. The tail end point of the bending section 12, the protruding point and the contact point of the plastic tube handle 2 are welded at high temperature and cooled to form a cold solidification point three 33 and a cold solidification point two 32, respectively, which are combined to form a double condensation fixed structure 3, and the cold solidification point one 31 formed by the contact point of the needle knife body 1 and the navigation structure 21 through high temperature welding and cooling to form a fixed structure as shown in FIG. Figure 1 The three-cold-fixing-point fixing structure 3 shown in the figure; of course, it can also be a single-cold-fixing-point fixing structure 3 with a cold-fixing point 31. The plastic tube handle 2 at the bending section 12 does not need high-temperature welding, and only needs to play an auxiliary blocking role.

[0074] The manufacturing method of the plastic handle needle knife of this embodiment comprises the following specific steps:

[0075] S1, insert the needle knife body 1 into the plastic tube handle 2, the diameter of the plastic tube handle 2 is about 0.5mm, the diameter of the needle knife body 1 is about 0.35mm, and the tail end of the needle knife body 1 extends out of the plastic tube handle 2 by 3 to 8mm;

[0076] S2, such as Figure 3 As shown, the extended H section is folded down by punching at a small angle of about 5° to form a bending section 12; the distance M from the tail end after bending to the axis of the needle body is less than the radius of the plastic tube handle;

[0077] S3, push the bent section 12 into the plastic tube handle 2, and the tail end and the protrusion of the bent section 12 are tightly pressed against the inner wall of the plastic tube handle 2 due to elasticity;

[0078] S4, high-temperature welding is performed on the plastic tube handle 2 and the fixed end of the needle knife body 1. The plastic tube handle 2 is softened by high temperature, and the tail end and the protrusion of the bending section 12 are elastically embedded in the inner wall of the plastic tube handle 2. After cooling and solidification, the plastic tube handle 2 and the fixed end of the needle knife body 1 are welded as a whole; the contact points with the plastic tube handle 2 form a cold solidification point 33 and a cold solidification point 2 32 respectively; the high-temperature welding of this step can be carried out by a high-frequency welding device 5, an ultrasonic welding device 7, a microwave welding device 8 or a laser welding device 9;

[0079] like Figure 4 As shown, when the high-frequency welding device 5 is used, the plastic handle needle knives 100 to be welded processed in the batch S3 step are neatly placed on the conveyor belt 51, and the high-frequency coil 52 is started. As the conveyor belt 51 is conveyed, the high-frequency coil 52 performs high-frequency high-temperature welding on the plastic handle needle knives 100 to be welded near the high-frequency coil 52. The welding principle is: high-frequency electromagnetic sound generates eddy currents in the metal needle knife body 1 through electromagnetic induction, and the eddy currents generate heat in the needle knife body 1 due to the thermal effect of the current. The needle knife body 1 conducts the heat to the contact part between the plastic pipe handle 2 and the needle knife body 1 and melts it, and solidifies it after cooling to form a welding point. Lasers and microwaves can also heat the steel wire through the plastic pipe handle 2 first. In essence, both are alternating electromagnetic fields, but the frequencies are different and the generation principles are different. Although plastics can absorb microwaves, metals have a stronger absorption capacity, so the metal temperature rises first and then transmits it to the plastic. During the welding process, the tail end of the bending section 12 and the protruding point are embedded into the inner wall of the softened plastic pipe handle 2. Under the premise of controlling the transmission speed, a batch of plastic handle needle knives 100 to be welded pass through the high-frequency coil 52 to produce welded plastic handle needle knives 200. The high-frequency welding production process is continuous and uninterrupted, and the production efficiency is high.

[0080] like Fig.14 , 15 As shown, when the microwave welding device 8 is used, the high-frequency coil 52 of the high-frequency welding device 5 is replaced by a microwave magnetron 81 fixed above the conveyor belt 51, and the plastic-handled needle knives 100 to be welded that pass through the bottom of the waveguide tube 82 in batches on the conveyor belt 51 are subjected to microwave welding at high temperature through a waveguide tube 82 connected to the microwave magnetron 81.

[0081] like Fig.11 , 12As shown, when the ultrasonic welding device 7 is used, the high-frequency coil 52 of the high-frequency welding device 5 is replaced with the ultrasonic welding device 7 fixed above the conveyor belt 51, and the welding head tip 71 at the bottom of the ultrasonic welding device 7 is used to insert the plastic handle needle knives 100 to be welded on the conveyor belt 51 in batches through the bottom of the welding head tip 71 to be ultrasonically fixedly connected one by one, and the welding head tip 71 is inserted into the bending part of the bending section 12 in the plastic pipe handle 2 to perform high-temperature welding generated by ultrasonic wave, and the welding head tip 71 is pulled out and cooled to generate a cold solid point;

[0082] like Fig.16 , 17 As shown, when the laser welding device 9 is used, the high-frequency coil 52 of the high-frequency welding device 5 is replaced with the laser welding device 9 fixed above the conveyor belt 51. The laser beam 91 generated at the bottom of the laser welding device 9 is used to perform a transmission laser fixed connection one by one on the conveyor belt 51 through the plastic handle needle knives 100 to be welded that pass through the bottom of the laser beam 91 in batches. The laser beam 91 performs a transmission-generated high-temperature welding on the bending part of the bending section 12 in the plastic pipe handle 2. After the laser beam 91 is turned off, the bending part is cooled to generate a cold solid point.

[0083] S5, the head end of the plastic tube handle 2 is flattened by high temperature extrusion die 4, during which the contact section of the needle knife body 1 and the high temperature softened plastic tube handle 2 is embedded into the inner wall of the plastic tube handle 2, and after cooling, a cold solid point 31 is formed. Extrusion molding does not require a lot of force, has low requirements on mold materials, does not require the use of expensive mold-specific materials, and does not require the use of special stamping equipment due to the small force, and can be extruded by using a cylinder to drive the extrusion head;

[0084] In this way, the first cold fixing point 31, the second cold fixing point 32 and the third cold fixing point 33 form a stable three-cold fixing point connection structure, further improving the firmness of the fixed connection.

[0085] Example 4

[0086] The plastic handle needle knife of this embodiment has the same basic structure as that of embodiment 3, except that: Fig. 9 , 13 As shown in FIGS. 15 and 17 , a portion of the fixed end of the needle knife body 1 is a wave bend 13 .

[0087] The manufacturing method of the plastic handle needle knife of this embodiment comprises the following specific steps:

[0088] S1, partially bending the fixed end of the needle knife body 1 into a wave bend 13;

[0089] S2, push the wave bend 13 into the plastic tube handle 2 near the navigation structure 21, and the wave bend 13 presses against the inner wall of the plastic tube handle 2 due to its elasticity;

[0090] S3. The head end of the plastic tube handle 2 is flattened by a high-temperature extrusion die 4. During the process, the contact section of the needle knife body 1 and the high-temperature softened plastic tube handle 2 is embedded into the inner wall of the plastic tube handle 2. The axial inner hole of the plastic tube handle 2 shrinks and clamps the needle knife body 1 in the inner hole, and a cold solid point 31 is formed after cooling.

[0091] In order to strengthen the connection, the corrugated bend 13 and the inner wall of the plastic pipe handle 2 can be welded at high temperature:

[0092] like Figure 4 As shown, when the high-frequency welding device 5 is used, the batch of plastic-handled needle knives 100 to be welded processed in step S2 are neatly placed on the conveyor belt 51, and the high-frequency coil 52 is started. As the conveyor belt 51 is conveyed, the high-frequency coil 52 performs high-frequency high-temperature welding on the plastic-handled needle knives 100 to be welded near the high-frequency coil 52, and each convex point of the wave bend 13 is embedded into the softened inner wall of the plastic tube handle 2, and multiple bending points form multiple cold solidification points 232. Under the premise of controlling the conveying speed, the batch of plastic-handled needle knives 100 to be welded pass through the high-frequency coil 52, and welded plastic-handled needle knives 200 are produced after cooling; when the wall of the plastic tube handle 2 is softened, the needle knife body 1 can be pulled in and out in a small amount in a wave shape or a zigzag shape, so that each convex point can be fully mixed with the inner wall of the molten softened plastic tube handle 2, and the convex point is cooled, solidified and hardened to make the needle knife body 1 more firmly connected;

[0093] like Fig.14 , 15 As shown, when the microwave welding device 8 is used, the high-frequency coil 52 of the high-frequency welding device 5 is replaced with a microwave magnetron 81 fixed above the conveyor belt 51, and the plastic-handled needle knives 100 to be welded on the conveyor belt 51 that pass through the bottom of the waveguide 82 in batches are heated by microwaves through a waveguide 82 connected to the microwave magnetron 81, forming a microwave heating section 23, and performing microwave welding-type high-temperature welding.

[0094] like Fig.11 , 12 As shown, when the ultrasonic welding device 7 is used, the high-frequency coil 52 of the high-frequency welding device 5 is replaced with the ultrasonic welding device 7 fixed above the conveyor belt 51, and the welding head tip 71 at the bottom of the ultrasonic welding device 7 is used to insert the plastic handle needle knives 100 to be welded on the conveyor belt 51 in batches through the bottom of the welding head tip 71 to be ultrasonically fixedly connected one by one, and the welding head tip 71 is inserted into the bending part of the wave bend 13 in the plastic pipe handle 2 to perform high-temperature welding generated by ultrasonic wave, and the welding head tip 71 is pulled out and cooled to generate a cold solid point;

[0095] like Fig.16 , 17As shown, when the laser welding device 9 is used, the high-frequency coil 52 of the high-frequency welding device 5 is replaced with a laser welding device 9 fixed above the conveyor belt 51. The laser beam 91 generated at the bottom of the laser welding device 9 is used to perform transmission laser fixed connection one by one on the conveyor belt 51 for the plastic handle needle knives 100 to be welded that pass through the bottom of the laser beam 91 in batches. The laser beam 91 is used to perform transmission-generated high-temperature welding on the bending part of the wave bend 13 in the plastic tube handle 2. After the laser beam 91 is turned off, the bending part is cooled to generate a cold solidification point.

[0096] In the plastic-handled needle knife of this embodiment, the wave bend 13 can be wavy or sawtooth-shaped, and each bend can form a cold-fixed point to further improve the welding connection strength.

[0097] Example 5

[0098] The plastic handle needle knife with a needle tube of this embodiment is as follows Fig.13 As shown, it includes a needle insertion catheter 6 and a plastic-handled needle knife of any one of Examples 1-4, the plastic tube handle 2 is fixedly connected to the inner wall of the needle insertion catheter 6, and a reserved distance is left between the needle knife edge 11 and the free end port of the plastic tube handle 2, that is, the needle knife edge 11 is retracted into the axial inner hole of the plastic tube handle 2.

[0099] The manufacturing method of the plastic-handled needle knife with a needle tube of this embodiment comprises the following steps:

[0100] When the high-temperature welding tool used is an ultrasonic welding tool 7, the ultrasonic wave is transmitted to the welding head tip 71, and ultrasonic vibration is generated at the tip. When the tip contacts the outer wall of the needle insertion catheter 6, the temperature rises to the melting point of the plastic and then melts. The welding head tip 71 further pierces the tube wall and contacts the plastic tube handle 2, causing the plastic tube handle 2 to partially melt. Part of the melted material of the needle insertion catheter 6 enters the needle insertion catheter 6 to bond the plastic tube handle 2 and the needle insertion catheter 6. After the welding head tip 71 is pulled out, Fig.13 , 22 As shown, ultrasonic welding micropores 72 are generated on the surface of the needle insertion catheter 6, welding micropores 61 are generated in other welding methods, and welding points 62 are generated on the inner wall. After the welding points 62 are cooled and solidified, the plastic tube handle 2 and the needle insertion catheter 6 are fixedly connected together.

[0101] When the high-temperature welding tool used is a laser welding device 9, there is no need to generate micropores, and the surface of the needle catheter 6 is smooth.

[0102] The plastic-handled needle knife with a needle insertion tube in this embodiment does not need to be fixed with an insert like the existing metal-handled needle knife and plastic-handled needle knife with a needle insertion tube on the market. The plastic-handled needle knife is welded to the needle insertion tube 6 and can be removed by one-handed operation. The operation is simple, convenient and labor-saving, and the needle insertion tube 6 can be recycled and reused without causing garbage pollution, which is environmentally friendly.

[0103] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure and manufacturing steps are not limited thereto. Therefore, if a person skilled in the art is inspired by it and, without departing from the purpose of the invention, designs a structure and an implementation method similar to the technical solution without creativity, they should all fall within the protection scope of the present invention.

Claims

1. A needle knife with a plastic handle, comprising a needle knife body (1) and a plastic tube handle (2), wherein the front end of the needle knife body (1) is a needle knife cutting edge (11), and characterized in that: A navigation structure (21) is provided at one end of the plastic tube handle (2), and the structural surface of the navigation structure (21) is aligned with the surface of the blade of the needle knife edge (11); the fixed end of the needle knife body (1) is fixedly connected to the plastic tube handle (2) via a fixed structure (3).

2. A needle knife with a plastic handle according to claim 1, characterized in that: The fixing structure (3) is a condensation fixing structure, a glue-dispensing fixing structure or a mechanical fixing structure.

3. A needle knife with a plastic handle according to claim 2, characterized in that: The fixed end of the needle knife body (1) is bent to form a bent section (12), and the tail end point of the bent section (12), the protruding point and / or the contact point between the needle knife body (1) and the navigation structure (21) are welded at high temperature and cooled to form a condensed fixed structure.

4. The needle knife with a plastic handle according to claim 3, characterized in that: The navigation structure (21) is a vertically symmetrical inclined surface, stepped surface or flattened surface structure.

5. The needle knife with a plastic handle according to claim 3, characterized in that: The fixed end of the needle knife body (1) is partially a wave bend (13), and the protruding points of the wave bend (13) and the contact points between the needle knife body (1) and the navigation structure (21) are cooled by high-temperature welding to form a multi-point fixed structure (3).

6. A plastic-handled needle knife according to any one of claims 3 to 5, characterized in that: The high temperature welding is high frequency welding, ultrasonic welding, microwave welding or laser welding.

7. A plastic-handled needle knife with a needle tube, characterized in that: It comprises a needle insertion catheter (6) and a plastic-handled needle knife according to any one of claims 1 to 6, wherein the plastic tube handle (2) is fixedly connected to the inner wall of the needle insertion catheter (6), and a distance is reserved between the needle knife edge (11) and the free end port of the plastic tube handle (2).

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