A handle shell forming die for a nodule positioning needle

Abstract

The utility model relates to medical instrument production technical field discloses a kind of handle shell forming mould for nodule positioning needle, including movable mould, fixed mould, first sliding assembly and second sliding assembly, and movable mould is equipped with movable mould kernel on movable mould, and fixed mould is equipped with fixed mould kernel on fixed mould, movable mould kernel and fixed mould kernel butt joint form forming chamber, first sliding assembly has first arbor that the tubular die cavity is formed with the wall surface of forming chamber by being inserted into forming chamber on first sliding assembly, second sliding assembly has second arbor that the variable-diameter die cavity is formed with the wall surface of forming chamber by being inserted into forming chamber on second sliding assembly, annular runner is equipped on the communication path that first arbor is inserted into outside tubular die cavity, and the outside of annular runner is connected with the injection runner of mould, and the inside of annular runner is connected with tubular die cavity by multiple gate runner, and each gate runner is distributed along circumferential direction interval;The utility model makes injection fluid even pressure into forming chamber, guarantee its stress distribution uniformity in forming chamber, improve the qualified rate of injection.

Description

Technical Field

[0001] This utility model relates to the field of medical device manufacturing technology, and in particular to a mold for forming the handle shell of a nodule positioning needle. Background Technology

[0002] Nodule localization needles are typically used for preoperative marking of pulmonary nodules, thereby assisting surgeons in locating and finding pulmonary nodules during surgery. When in use, the external needle tube is first inserted into the body, and medical staff use a guide wire pushing mechanism to push the guide wire out of the external needle tube and place it in the lung tissue to complete the localization.

[0003] The nodule positioning pin includes a handle housing, an outer needle tube, a guide wire, and a guide wire pushing mechanism. The handle housing has a variable-diameter boss at one end for connecting to the outer needle tube, and a tubular cavity at the other end connected to the variable-diameter boss. A strip-shaped pushing hole is also provided on the outer side of the handle housing for the guide wire to enter and exit the outer needle tube with the assistance of the guide wire pushing mechanism. Currently, manufacturers often use core-pulling molding to injection mold the handle housing. The injection runner in the mold is connected to the molding cavity for molding the handle housing via a sprue chamber. However, the sprue chamber is usually a single conical chamber located at the end of the molding cavity and perpendicular to it. The plasticized granular fluid enters the molding cavity through this conical chamber, making it difficult to ensure uniform stress distribution within the molding cavity. Since the handle housing has a certain length, after mold opening, the released stress in the injection molded part can cause uneven stress distribution, leading to deformation of the handle housing and even bending along its length, affecting the injection molding yield of the handle housing. Utility Model Content

[0004] To address the shortcomings of the existing technology, this utility model provides a mold for the handle housing of a nodule positioning needle, which allows the fluid to be uniformly pressed into the molding cavity, ensuring the uniform stress distribution within the molding cavity and improving the injection molding pass rate.

[0005] The technical solution of this utility model is as follows: a mold for forming a handle housing of a nodule positioning pin, comprising a moving mold, a fixed mold, and a first sliding component and a second sliding component that are relatively slidably disposed on the fixed mold. The moving mold is provided with a moving mold core, and the fixed mold is provided with a fixed mold core. The moving mold core and the fixed mold core are joined to form a molding cavity. The first sliding component has a first mandrel that extends into the molding cavity and forms a tubular mold cavity with the wall of the molding cavity. The second sliding component has a second mandrel that extends into the molding cavity and forms a variable diameter mold cavity with the wall of the molding cavity. An annular flow channel is provided on the connecting path on the outside of the tubular mold cavity for the first mandrel to extend into. The outside of the annular flow channel is connected to the injection flow channel of the mold. The inside of the annular flow channel is connected to the tubular mold cavity through multiple gate flow channels. Each gate flow channel is distributed circumferentially. By setting an annular runner at one end near the tubular mold cavity, the plasticized granular fluid enters the annular runner through the injection runner, and then enters the tubular mold cavity through the spaced-apart gate runner. Compared with the traditional single gate feeding, the annular runner makes the granular fluid evenly distributed on the outside of the tubular mold cavity and feeds into the molding cavity through multiple gates, thereby ensuring the stress uniformity of the granular fluid in the molding cavity, avoiding the deformation of the injection molded parts caused by uneven stress, and thus effectively improving the injection molding qualification rate.

[0006] The first sliding assembly includes a cylinder unit and a mandrel fixing block. A fixing seat is provided extending outward from one side of the fixed mold. An embedding groove communicating with the molding chamber is opened in the fixing seat. The mandrel fixing block is slidably disposed in the embedding groove. The first mandrel is fixed inside the mandrel fixing block. The cylinder unit is fixed outside the fixing seat, and the telescopic rod of the cylinder unit is fixedly connected to the mandrel fixing block via a push block.

[0007] The second sliding component includes a sliding block and an inclined guide post. The fixed mold has an embedding groove 2 that communicates with the molding cavity. The sliding block is slidably disposed in the embedding groove 2. The second mandrel is fixed inside the sliding block. One end of the inclined guide post is fixed on the moving mold, and the other end is inclined away from the molding cavity. The sliding block has a guide hole that cooperates with the inclined guide post.

[0008] The moving mold core has an upper groove and upper through grooves 1 and 2 located on both sides of the upper groove. The fixed mold core has a lower groove that connects with the upper groove to form a molding cavity, a lower through groove 1 that connects with the upper through groove 1 to form a connecting path for the first mandrel to extend into, and a lower through groove 2 that connects with the upper through groove 2 to form a connecting path for the second mandrel to extend into. The upper through groove 1 has an upper outer ring groove, and the lower through groove 1 has a lower outer ring groove. The upper outer ring groove and the lower outer ring groove connect to form the annular flow channel. The gating flow channel includes an upper gating groove and a lower gating groove. The upper gating groove is located on the upper through groove 1 between the upper outer ring groove and the upper groove and gradually narrows towards the upper groove. The lower gating groove is located on the lower through groove 2 between the lower outer ring groove and the lower groove and gradually narrows towards the lower groove.

[0009] There are two upper and two lower grooves, symmetrically arranged on both sides of the injection runner. The fixed mold has a center injection hole located in the center, offset towards the first sliding component. The moving mold core has a guide hole corresponding to the center injection hole, which is connected to the injection runner. The double upper and lower grooves allow the mold to achieve two-stage molding in a single process, improving the yield of injection molded parts. The offset of the center injection hole towards the first sliding component reduces the amount of waste material used.

[0010] The bottom of the fixed mold is provided with a base plate, which is fixedly connected to the fixed mold via two side plates. A push plate is provided between the two side plates. Multiple guide pillars are provided between the push plate and the fixed mold. One end of the guide pillar is fixedly connected to the fixed mold, and the other end passes through the push plate downwards. A return spring is sleeved on the outside of the guide pillar. A demolding rod is fixed at the top of the push plate. The demolding rod passes upwards through the fixed mold and the mold core and is connected to the injection flow channel inside the mold core.

[0011] There are two upper gate slots, symmetrically arranged on both sides of the central axis of the upper through slot one; or, there are two lower gate slots, symmetrically arranged on both sides of the central axis of the lower through slot one.

[0012] The total arc length projected onto the inner wall of the first mandrel by the small-sized end of each of the upper gate slots is equal to the total arc length projected onto the inner wall of the first mandrel by the small-sized end of each of the lower gate slots.

[0013] In summary, the present invention has the following main advantages: This invention features an annular flow channel at one end near the tubular mold cavity. The plasticized granular fluid enters the annular flow channel through the injection channel, and then enters the tubular mold cavity through spaced-apart gate channels. Compared to traditional single-gate feeding, the annular flow channel ensures that the granular fluid is evenly distributed on the outside of the tubular mold cavity and fed into the molding cavity through multiple gates. This guarantees the uniformity of stress in the molding cavity and avoids deformation of the injection molded parts caused by uneven stress, thereby effectively improving the injection molding pass rate. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional schematic diagram of the present invention; Figure 3 This is a schematic diagram of the fixed mold structure in this utility model; Figure 4 This is a schematic diagram of the moving mold in this utility model; Figure 5 This is a schematic diagram of the structure of the fixed mold core in this utility model; Figure 6 This is a schematic diagram of the structure of the moving mold core in this utility model; Figure 7 This is a partial schematic diagram showing the connection between the upper sprue groove, the upper through groove, and the upper outer ring groove inside the moving mold core in this utility model; Figure 8 This is a schematic diagram of the injection molded part structure of this utility model.

[0015] Reference numerals: 1. Fixed mold; 101. Fixed base; 102. Embedded groove one; 103. Embedded groove two; 2. Moving mold; 201. Locking groove; 202. Butt groove; 203. Injection center hole; 3. Fixed mold core; 301. Lower groove; 302. Lower through groove one; 303. Lower through groove two; 304. Lower outer ring groove; 305. Lower gate groove; 306. Positioning slot; 4. Moving mold core; 401. Upper groove; 402. Upper through groove one; 403. Upper through groove two; 404. Upper outer ring groove; 405. Upper gate groove; 406. Positioning groove; 407. Guide hole; 5. 501. First sliding assembly; 502. First mandrel; 503. Mandrel fixing block; 504. Cylinder unit; 505. Push block; 6. Second sliding assembly; 601. Second mandrel; 602. Sliding block; 603. Inclined guide post; 604. Guide hole; 7. Base plate; 8. Push plate; 801. Guide post; 802. Return spring; 803. Demolding rod; 9. Side plate; 10. Injection runner; 11. Wing plate; 100. Tubular cavity; 200. Variable diameter boss; 300. Strip push hole; 400. Runner tail material; 500. Annular tail material; 600. Gate tail material. Detailed Implementation

[0016] The technical solutions of the present utility model will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0017] In the following description, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0018] Furthermore, in this utility model, directional terms such as "upper," "lower," "left," and "right" may be defined relative to the orientation of the components shown in the accompanying drawings. It should be understood that these directional terms can be relative concepts, used for relative description and clarification, and can change accordingly based on the orientation of the components in the accompanying drawings.

[0019] like Figures 1-3 As shown, this utility model provides a mold for forming the handle housing of a nodule positioning needle, including a moving mold 2, a fixed mold 1, and a first sliding component 5 and a second sliding component 6 that are slidably disposed on the fixed mold 1. A moving mold core 4 is fixed on the moving mold 2, and a fixed mold core 3 is fixed on the fixed mold 1. The moving mold core 4 and the fixed mold core 3 are joined to form a molding cavity. The first sliding component 5 has a first mandrel 501 that extends into the molding cavity and forms a tubular mold cavity with the wall of the molding cavity. The second sliding component 6 has a second mandrel 601 that extends into the molding cavity and forms a variable diameter mold cavity with the wall of the molding cavity. Specifically, the surface of the moving mold core 4 is provided with an upper groove 401 and a mandrel 601 located in the upper groove 401. The upper through groove 402 and the upper through groove 403 on both sides of the fixed mold core 3 are provided with a lower groove 301 and lower through groove 302 and the lower through groove 303 on both sides of the lower groove 301; the upper groove 401 and the lower groove 301 are joined to form a molding cavity, the upper through groove 402 and the lower through groove 302 are joined to form a connecting path for the first mandrel 501 to extend into, and the upper through groove 403 and the lower through groove 303 are joined to form a connecting path for the second mandrel 601 to extend into. Similar to the prior art, a protrusion for matching the strip-shaped push hole 300 of the handle housing is formed in the upper groove 401. After the ends of the first mandrel 501 and the second mandrel 601 are joined, and the moving mold core 4 and the fixed mold core 3 are joined, as shown in the figure. Figure 8As shown, a tubular cavity 100 with a handle housing is formed in a tubular mold cavity surrounded by an upper groove 401, a lower groove 301 and a first mandrel 501, and a variable diameter boss 200 with a handle housing is formed in a variable diameter mold cavity surrounded by an upper groove 401, a lower groove 301 and a second mandrel 601.

[0020] More preferably, an annular flow channel is provided on the connecting path on the outer side of the tubular mold cavity into which the first mandrel 501 extends. The outer side of the annular flow channel is connected to the injection runner 10 of the mold, and the inner side of the annular flow channel is connected to the tubular mold cavity via multiple gate runners. Each of the gate runners is distributed circumferentially at intervals. Specifically, for example... Figure 5 and Figure 6 As shown, the upper through groove 402 is provided with an upper outer annular groove 404, and the lower through groove 302 is provided with a lower outer annular groove 304. The upper outer annular groove 404 and the lower outer annular groove 304 are joined to form the aforementioned annular flow channel, and the gate flow channel includes an upper gate groove 405 and a lower gate groove 305, as shown. Figure 5 As shown, the upper gate groove 405 is located in the upper through groove 402 between the upper outer ring groove 404 and the upper recess 401. The upper gate groove 405 is tapered towards the upper recess 401, as shown in the figure. Figure 6 As shown, the lower gate groove 305 is located in the lower through groove 303 between the lower outer ring groove 304 and the lower groove 301, and the lower gate groove 305 is gradually tapered toward the lower groove 301.

[0021] By setting an annular runner at one end near the tubular mold cavity, the plasticized granular fluid enters the annular runner through the injection runner 10 and fills the annular runner. Then, it enters the tubular mold cavity through the spaced-out gate runners. Compared with the traditional single gate feeding, the annular runner makes the granular fluid evenly distributed on the outside of the tubular mold cavity and feeds into the molding cavity through multiple gates. This ensures the uniformity of stress of the granular fluid in the molding cavity and avoids the deformation of the injection molded parts caused by uneven stress, thereby effectively improving the injection molding qualification rate.

[0022] Further preferred, such as Figure 5 and Figure 7 As shown, there are two upper gate slots 405, symmetrically arranged on both sides of the central axis of the upper through slot 402, or there are two lower gate slots 305, symmetrically arranged on both sides of the central axis of the lower through slot 302; the arrangement of double upper gate slots 405 or double lower gate slots can increase the number of inlets for granular fluid to enter the molding cavity as much as possible, further improving the uniformity of feeding.

[0023] Further preferred, such as Figure 7As shown, the total arc length L1 of the small-sized end of each upper gate groove 405 projected onto the inner wall of the first mandrel 501 is equal to the total arc length (not shown) of the small-sized end of each lower gate groove 305 projected onto the inner wall of the first mandrel 501. This ensures that the inlet area from the upper gate groove 405 into the upper groove 401 is approximately the same as the inlet area from the lower gate groove 305 into the lower groove 301. This ensures that the injection speed in the upper and lower grooves 301 is the same, further ensuring the uniformity of injection and maximizing the offsetting of stress deviation.

[0024] like Figure 3 As shown, the first sliding assembly 5 includes a cylinder unit 503 and a mandrel fixing block 502. A fixing seat 101 extends outward from the left side of the fixed mold 1. The fixing seat 101 has an embedding groove 102 that communicates with the molding chamber. The mandrel fixing block 502 is slidably disposed in the embedding groove 102. The first mandrel 501 is fixed inside the mandrel fixing block 502. The cylinder unit 503 is fixed outside the fixing seat 101, and the telescopic rod of the cylinder unit 503 is connected to the molding chamber via a push block 504. The mandrel fixing block 502 is fixedly connected. Specifically, in this solution, the bottom two sides of the mandrel fixing block 502 are machined with sliding plates, and the two sides of the embedding groove 102 are fixed with wing plates 11. The two wing plates 11 and the bottom of the embedding groove 102 form a slide rail that slides in cooperation with the sliding plates of the mandrel fixing block 502. Driven by the cylinder unit 503, the mandrel fixing block 502 moves laterally along the slide rail, driving the inner first mandrel 501 to enter and exit the connecting path formed by the upper through groove 402 and the lower through groove 302; as Figure 3 and Figure 4As shown, the second sliding assembly 6 includes a sliding block 602 and an inclined guide post 603. An embedding groove 103 communicating with the molding chamber is formed on the fixed mold 1 to the right of the fixed mold core 3. The sliding block 602 is slidably disposed within the embedding groove 103. Similar to the first sliding assembly 5, the bottom sides of the sliding block 602 are also machined with sliding plates. Wing plates 11 are fixed to both sides of the embedding groove 103, forming a sliding track 2 between the two wing plates 11 and the bottom of the embedding groove 103, which cooperates with the sliding plate portion of the sliding block 602. The second mandrel 601 is fixed inside the sliding block 602, and the inclined guide post 603... One end is fixed to the moving mold 2, and the other end is inclined away from the molding chamber. The sliding block 602 is provided with a guide hole 604 that cooperates with the inclined guide post 603. During the docking process of the moving mold core 4 and the fixed mold core 3, the inclined guide post 603 cooperates with the guide hole 604 to push the sliding block 602 inward. The second mandrel 601 on the inner side of the sliding block 602 docks with the end of the first mandrel 501 along the connecting path formed by the upper through groove 403 and the lower through groove 303. When the moving mold core 4 and the fixed mold core 3 separate, the inclined guide post 603 pushes the sliding block 602 outward, and the second mandrel 601 moves out of the molding chamber.

[0025] Of course, in order to ensure the successful joining of the moving mold 2 and the fixed mold 1, a docking groove 202 corresponding to the first embedding groove 102 is provided on the moving mold 2. The docking groove 202 and the first embedding groove 102 dock together to form a moving space for the pushing block 504 and the mandrel fixing block 502 to move laterally together. A locking groove 201 corresponding to the second embedding groove 103 is provided on the moving mold core 4. The side of the locking groove 201 away from the moving mold core 4 is provided with a locking inclined surface with the same inclination angle as the inclined guide post 603. The outer side of the sliding block 602 is provided with an outer inclined surface that cooperates with the locking inclined surface.

[0026] To ensure the positioning and docking between the moving mold core 4 and the fixed mold core 3, positioning grooves 406 are provided on the four corners of the moving mold core 4, and positioning slots 306 that cooperate with the positioning grooves 406 are provided on the four corners of the fixed mold core 3.

[0027] To improve the yield of injection molded handle housing parts, there are two upper grooves 401 and two lower grooves 301, symmetrically arranged on both sides of the injection runner 10, thus achieving the effect of producing two sets of products from one mold; an injection center hole 203 is provided in the middle of the fixed mold 1, biased towards the first sliding component 5, and a guide hole 407 corresponding to the position of the injection center hole 203 is provided on the moving mold core 4. The guide hole 407 is connected to the injection runner 10, specifically, as shown in... Figure 5 and Figure 6As shown, the injection runner 10 is a cross-shaped runner. The horizontal section of the cross-shaped runner is connected to an annular runner at both ends. One end of the vertical section of the cross-shaped runner is connected to the guide hole. The part formed by the injection runner 10 is the tail part. The setting of the injection center hole 203 biased towards the first sliding component 5 can reduce the amount of tail material used.

[0028] like Figure 1 and Figure 2 As shown, the bottom of the fixed mold 1 is provided with a base plate 7. The base plate 7 is fixedly connected to the fixed mold 1 via two side plates 9. A push plate 8 is provided between the two side plates 9. Multiple guide pillars 801 are provided between the push plate 8 and the fixed mold 1. One end of the guide pillar 801 is fixedly connected to the fixed mold 1, and the other end passes downward through the push plate 8. A return spring 802 is sleeved on the outside of the guide pillar 801. A demolding rod 803 is fixed at the top of the push plate 8. The demolding rod 803 passes upward through the fixed mold 1 and the fixed mold core 3 and is connected to the injection runner 10 in the fixed mold core 3. After the external driving component (lifting cylinder) passes through the base plate 7, it pushes the push plate 8 to move upward, thereby driving the demolding rod 803 to pass through the injection runner 10, pushing the tail material in the injection runner 10 and the connected handle housing injection molded part out of the mold, completing the demolding process. The push plate 8 is reset under the action of the return spring 802.

[0029] When implementing the above technical solution, the components are assembled and injection molded. The granular fluid enters the injection runner 10 through the injection center hole 203, flows along both sides, and fills the annular runner. Under injection pressure, the granular fluid enters the cavity formed by the docking of the upper groove 401, lower groove 301, first mandrel 501, and second mandrel 601 along each gate runner. Compared to the single conical cavity injection method in existing technologies, the molding stress distribution of the granular fluid within the cavity is more uniform. After mold opening, the handle housing shows no deformation. Figure 8 As shown, the molded injection part includes tail material (runner tail material 400, annular tail material 500 and gate tail material 600) and handle housing. After removing the injection part, the operator can break it along the connection between the gate tail material 600 and the handle housing to separate the product from the tail material rod.

[0030] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A mold for forming a handle housing of a nodule positioning needle, comprising a movable mold, a fixed mold, and a first sliding assembly and a second sliding assembly slidably disposed on the fixed mold, wherein the movable mold has a movable mold core, the fixed mold has a fixed mold core, the movable mold core and the fixed mold core are joined to form a molding cavity, the first sliding assembly has a first mandrel extending into the molding cavity and forming a tubular mold cavity with the wall of the molding cavity, and the second sliding assembly has a second mandrel extending into the molding cavity and forming a variable diameter mold cavity with the wall of the molding cavity, characterized in that, An annular flow channel is provided on the connecting path on the outside of the tubular mold cavity into which the first mandrel extends. The outside of the annular flow channel is connected to the injection flow channel of the mold. The inside of the annular flow channel is connected to the tubular mold cavity through multiple gate flow channels, and each gate flow channel is distributed circumferentially.

2. The mold for forming the handle housing of a nodule positioning needle according to claim 1, characterized in that, The first sliding assembly includes a cylinder unit and a mandrel fixing block. A fixing seat is provided extending outward from one side of the fixed mold. An embedding groove communicating with the molding chamber is opened in the fixing seat. The mandrel fixing block is slidably disposed in the embedding groove. The first mandrel is fixed inside the mandrel fixing block. The cylinder unit is fixed outside the fixing seat, and the telescopic rod of the cylinder unit is fixedly connected to the mandrel fixing block via a push block.

3. The mold for forming the handle housing of a nodule positioning needle according to claim 1, characterized in that, The second sliding component includes a sliding block and an inclined guide post. The fixed mold has an embedding groove 2 that communicates with the molding cavity. The sliding block is slidably disposed in the embedding groove 2. The second mandrel is fixed inside the sliding block. One end of the inclined guide post is fixed on the moving mold, and the other end is inclined away from the molding cavity. The sliding block has a guide hole that cooperates with the inclined guide post.

4. A mold for forming the handle housing of a nodule positioning pin according to any one of claims 1-3, characterized in that, The moving mold core has an upper groove and upper through grooves 1 and 2 located on both sides of the upper groove. The fixed mold core has a lower groove that connects with the upper groove to form a molding cavity, a lower through groove 1 that connects with the upper through groove 1 to form a connecting path for the first mandrel to extend into, and a lower through groove 2 that connects with the upper through groove 2 to form a connecting path for the second mandrel to extend into. The upper through groove 1 has an upper outer ring groove, and the lower through groove 1 has a lower outer ring groove. The upper outer ring groove and the lower outer ring groove connect to form the annular flow channel. The gating flow channel includes an upper gating groove and a lower gating groove. The upper gating groove is located on the upper through groove 1 between the upper outer ring groove and the upper groove and gradually narrows towards the upper groove. The lower gating groove is located on the lower through groove 2 between the lower outer ring groove and the lower groove and gradually narrows towards the lower groove.

5. The mold for forming the handle housing of a nodule positioning needle according to claim 4, characterized in that, There are two upper grooves and two lower grooves, symmetrically arranged on both sides of the injection runner. The fixed mold has an injection center hole at the center of the fixed mold, which is biased towards the first sliding component. The moving mold core has a guide hole corresponding to the position of the injection center hole. The guide hole is connected to the injection runner.

6. A mold for forming the handle housing of a nodule positioning pin according to any one of claims 1-3, characterized in that, The bottom of the fixed mold is provided with a base plate, which is fixedly connected to the fixed mold via two side plates. A push plate is provided between the two side plates. Multiple guide pillars are provided between the push plate and the fixed mold. One end of the guide pillar is fixedly connected to the fixed mold, and the other end passes through the push plate downwards. A return spring is sleeved on the outside of the guide pillar. A demolding rod is fixed at the top of the push plate. The demolding rod passes upwards through the fixed mold and the mold core and is connected to the injection flow channel inside the mold core.

7. A mold for forming the handle housing of a nodule positioning needle according to claim 4, characterized in that, There are two upper gate slots, symmetrically arranged on both sides of the central axis of the upper through slot one; or, there are two lower gate slots, symmetrically arranged on both sides of the central axis of the lower through slot one.

8. The mold for forming the handle housing of a nodule positioning needle according to claim 7, characterized in that, The total arc length projected onto the inner wall of the first mandrel by the small-sized end of each of the upper gate slots is equal to the total arc length projected onto the inner wall of the first mandrel by the small-sized end of each of the lower gate slots.

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