A kind of CGM guide needle assembly secondary injection molding production manufacturing process

Abstract

The application discloses a CGM guide needle assembly secondary injection molding production and manufacturing process, comprising the following steps: stamping processing a metal material plate to form a needle body with a preset structure; then, performing composite injection coating molding on the needle body to form a plastic body in a preset area of the needle body; the plastic body comprises a first glue block and a second glue block, the second glue block is at least partially coated on the first glue block, the second glue block and the first glue block form an integrated structure, and the Shore hardness of the second glue block is not equal to that of the first glue block; finally, cooling the glue blocks to obtain the guide needle assembly, which can provide buffering and damping and sealing effects through the softer glue block, and can provide structural support and anti-deformation effects through the harder glue block, so that the structural reliability of the guide needle assembly is effectively improved, and the puncture stability and use safety are improved.

Description

Technical Field

[0001] This invention relates to the field of medical device manufacturing technology, and in particular to a secondary injection molding manufacturing process for CGM guide needle assemblies. Background Technology

[0002] With the development of technology, a continuous glucose meter (CGM) is a device that can continuously monitor the glucose concentration in subcutaneous interstitial fluid. It measures blood glucose levels through a tiny sensor, usually placed in the abdomen or upper arm, and wirelessly transmits the data to a receiver or smartphone application. When the sensor is implanted in the abdomen or upper arm, an implantation device is required, which involves the application of a guide needle.

[0003] Currently, the plastic parts of the guide needle assembly are mostly made of a single-hardness material and bonded to the needle body through a one-time injection molding process. However, materials with a single hardness have inherent drawbacks: if the material is too hard, although it can provide good structural support and resistance to deformation, the cushioning and shock absorption effect during puncture is poor, resulting in significant pain for the patient, and the seal at the skin contact point is not good; if the material is too soft, although it can improve comfort and sealing effect, the structural strength is insufficient, making it prone to deformation during use, affecting puncture accuracy and operational stability. Existing technologies also employ a modular assembly of plastic blocks with different hardnesses, but this increases the number of parts and assembly steps, not only increasing manufacturing costs but also affecting the overall reliability and consistency of the assembly due to issues such as assembly gaps.

[0004] Therefore, how to ensure that the plastic part of the guide needle assembly has both good cushioning and sealing performance and structural support performance, and ensures a stable connection with the needle body, is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, the present invention provides a secondary injection molding manufacturing process for CGM guide pin assemblies.

[0006] The technical solution adopted by this invention to solve its technical problem is: This invention provides a secondary injection molding manufacturing process for CGM guide pin assemblies, comprising the following steps: S1, stamping the metal sheet to form a needle with a preset structure; S2, perform composite injection molding to form a plastic body in a predetermined area of ​​the needle body; The plastic body includes a first plastic block and a second plastic block, the second plastic block at least partially covers the first plastic block, the second plastic block and the first plastic block form an integral structure, and the Shore hardness of the second plastic block and the first plastic block are not equal; S3, after the glue block cools, the guide pin assembly is obtained.

[0007] Preferably, the needle body includes a base and a bent portion formed by bending and extending from the upper end of the base in the width direction. One end of the base in the length direction is provided with a needle tip. The needle body is provided with a first groove and a protrusion. The first groove and the protrusion are located on the needle body at the end away from the needle tip, and the protrusion is disposed adjacent to the first groove. In S2, the plastic body is located at the end of the needle body away from the needle tip. The first groove and the protrusion are concentrated at the tail end away from the needle tip, and the plastic body is directly injection molded to cover this tail end area. The groove and the protrusion form a high and low locking structure on the surface of the needle body. After the molten plastic enters the groove and covers the protrusion and solidifies, even if it is repeatedly pushed, pulled or twisted, the plastic body is difficult to loosen or rotate from the needle body, thus improving the connection stability.

[0008] Preferably, the first rubber block is formed on the needle body by a first injection molding to form a rigid support structure; the second rubber block is formed on the first rubber block by a second injection molding to form a soft contact structure; the second rubber block and the first rubber block are fused together by a second injection molding to form an integral connection structure. The two injection molding processes are performed in two stages. First, a rigid first rubber block is made as a force-bearing skeleton connected to the needle body, and then a soft second rubber block is made to cover the skeleton. Moreover, during the second injection molding, the soft rubber is fused to the already shaped rigid rubber surface at a high temperature, and there is no physical gap between the two layers of rubber, which effectively avoids the situation of delamination and peeling in the later stage.

[0009] Preferably, the first and second plastic blocks are formed onto the needle body via a composite injection molding process. The first plastic block uses a hard plastic material to form a support structure, while the second plastic block uses a soft plastic material to form a cushioning contact structure. The first and second plastic blocks are melted together during the composite injection molding process to form an integral structure. The hard and soft plastics are directly made into an inseparable whole using composite injection molding. The hard plastic is responsible for ensuring that the entire plastic head does not easily deform, while the soft plastic is responsible for providing flexible cushioning when in contact with the skin or other instruments. The two layers of material are heat-fused during molding and completely fused together after cooling. Even with long-term use, there will be no problem of separation between the hard and soft plastics.

[0010] Preferably, the stamping step in S1 includes: S11, punching an external metal plate to form a needle body outline plate, and forming a first groove and a protrusion on the needle body outline plate. The first groove penetrates the needle body outline plate along the thickness direction, and the protrusion is formed in the needle body area on the side of the first groove. S12, the needle body contour plate is pressed to form a needle body, the needle body including a base and a bent portion that extends from the width direction of the base; The first groove has a preset shape and extends from the base to the bending part. The first groove and the protrusion are processed in one go during the stage of punching out the needle body outline plate. Moreover, the groove penetrates the material plate and spans from the base to the bending part. After pressing, this through groove spans multiple different planes of the needle body. During subsequent injection molding, the rubber material can flow into the through groove to connect the inner and outer sides of the bending rubber into one, which is equivalent to using a rubber connecting bridge to firmly lock the two sides of the bending area of ​​the needle body together, while preventing gas from flowing directly through the linear base or bending part.

[0011] Preferably, the stamping step in S1 further includes: S13, After punching to form the needle body contour plate, the needle body contour plate is polished. The polishing operation is completed before the needle body contour plate is pressed. S14, the formed needle body is processed to form a deformable structure on the protrusion and / or bending part to change the spatial shape of the needle body. Before forming, grinding is performed to remove burrs and micro-notches on the punched surface, making the injection-molded area on the needle body surface smoother and cleaner, reducing the risk of breakage caused by stress concentration. After forming, another local forming process is performed on the protrusion or bending part to create a deformable structure in the spatial shape, which can further enhance the plastic body's resistance to push-pull and torsional forces.

[0012] Preferably, the stamping step in S1 further includes: S111, punching the outer material plate to form a belt body, and forming ears on the belt body, the needle body outline plate is provided on the belt body, and at least two ears are provided, the ears are provided on the inner wall in the length direction of the belt body and / or the inner wall in the width direction of the belt body. S121, the two ears are bent and formed on opposite sides in the thickness direction of the strip body, the strip body connecting the needle body contour plate is punched out on the material plate at the same time, and at least two ears are made on the inner wall of the strip body. Then they are bent in opposite directions in the thickness direction of the strip body. In this way, in subsequent processing and handling, the folded ears can provide support and preset gap for the entire strip body on the injection mold or conveyor track.

[0013] Preferably, the belt body is provided with a first ear group and a second ear group, which are respectively located at both ends in the length direction of the belt body; The first ear group and the second ear group each include two ears, and the two ears in the same ear group are bent into shape on opposite sides in the thickness direction of the belt; Among them, the two ears in the first ear group extend along the length direction of the belt body, and the two ears in the second ear group are located at both ends of the width direction of the belt body and extend along the width direction of the belt body. The two ears in the second ear group are located at one end of the belt body along its length to connect to the needle body. A set of ears that fold back to both sides is arranged at each end of the belt body. The front ear is arranged along the length of the belt body and the rear ear is arranged along the width of the belt body. In particular, the ear near the needle body is made into a horizontally folded structure, which is equivalent to setting two additional three-dimensional support legs at the "root" of the needle body. During conveying and injection molding, these two support legs can withstand greater clamping force and injection pressure. The needle body will not lift or deviate due to force on one side, further ensuring the positional accuracy of injection molding.

[0014] Preferably, the manufacturing process also includes punching the needle body to form the needle tip. The punching step is performed in S14 after the needle body contour plate has formed the deformed structure, or after the plastic body has been injected into the needle body. By arranging the punching of the needle tip after all forming processes and injection molding are completed, the needle tip can be prevented from being damaged by impacts during the multiple punching, forming, grinding and high-temperature injection molding processes in the early stage. This ensures that the final needle tip maintains its initial sharpness, making the puncture entry easier and the tearing of the skin or tissue relatively smaller. At the same time, since there is no needle tip during injection molding, the operation safety of workers and molds is also higher.

[0015] Preferably, the needle body includes a base and a bent portion extending from the width direction of the base. One end of the base in the length direction is provided with a needle tip, and the end of the base away from the needle tip is provided with a connecting portion. The width dimension of the connecting portion near the end of the base is smaller than the width dimension of the connecting portion away from the base. A second groove is provided on the connecting portion, and the second groove penetrates the connecting portion along the thickness direction. A connecting portion with a narrow root and a wide end is provided between the tail end of the needle body and the belt body, and a through second groove is opened on it. The narrow root structure can effectively prevent airflow from penetrating the plastic body along the needle body, while the wide end ensures sufficient connection strength with the belt body, so as not to break accidentally in the previous multiple processes. The through second groove further weakens the movement of airflow along the straight path.

[0016] The beneficial effects of this invention are: The needle body with a pre-defined structure is formed by stamping a metal sheet, and then composite injection molding is performed to form a plastic body in the pre-defined area of ​​the needle body, consisting of a first plastic block and a second plastic block with different Shore hardness and an integral structure. Finally, the guide needle assembly is obtained by cooling. This process realizes the integrated composite coating of two plastics with different hardnesses. While the plastic body is firmly bonded to the needle body, it can provide cushioning, shock absorption and sealing through the softer plastic block, and structural support and deformation resistance through the harder plastic block. This effectively improves the structural reliability of the guide needle assembly, as well as the puncture stability and safety of use. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. The accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is one of the structural schematic diagrams of the CGM guide pin assembly of the present invention disposed on the belt body; Figure 2 This is the second schematic diagram of the structure of the CGM guide pin assembly of the present invention disposed on the belt body; Figure 3 This is a schematic diagram of the cross-sectional structure of the CGM guide pin assembly of the present invention disposed on the belt body; Figure 4 This is an exploded view of the CGM guide pin assembly and the tape body of the present invention; Figure 5 This is a schematic diagram of the planar structure of the needle body of the present invention before it is pressed and formed; Figure 6 This is a schematic diagram of the structure of the needle body after compression molding according to the present invention; Figure 7 This is a schematic diagram of the production process of the CGM guide pin assembly of the present invention; Figure 8 This is a schematic diagram of the structure of the first plastic block of the present invention; Figure 9 This is a schematic diagram of the structure of the second plastic block of the present invention.

[0020] The reference numerals in the figures include: 1. Needle body; 2. Belt body; 3. Plastic body; 101. Base; 102. Bending part; 1020. Arc-shaped segment; 103. Needle tip; 11. First groove; 12. Protrusion; 13. Connecting part; 14. Second groove; 21. Ear; 22. Connecting part; 31. First plastic block; 311. Block; 3111. Third groove; 3112. Disc; 312. Fourth groove; 313. Fifth groove; 314. Sixth groove; 32. Second plastic block; 321. Ring; 322. Protrusion. Detailed Implementation

[0021] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0022] In the description of this application, terms such as "first" and "second" are used only to distinguish different objects, not to describe a specific order. Furthermore, unless otherwise stated, " / " means "or," for example, A / B can mean A or B. "And / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone. Additionally, "at least one" refers to one or more, and "multiple" refers to two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or multiple items. For example, at least one of a, b, or c can represent: a, b, c; a and b; a and c; b and c; or a and b and c. Where a, b, and c can be single or multiple.

[0023] The terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0024] In this application, the words "exemplary" or "for example" are used to indicate that something is an example, illustration, or illustration. Any embodiment or design described as "exemplary," "for example," or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or designs. Rather, the use of the words "exemplary," "for example," or "for example" is intended to present the relevant concepts in a specific manner.

[0025] It is understood that in this application, "when," "if," and "if" all refer to the device making a corresponding action under certain objective circumstances, and are not time-limited, nor do they require the device to make a judgment action when it is implemented, nor do they imply any other limitations.

[0026] In this application, the use of singular designations for elements is intended to represent "one or more" rather than "one and only one," unless otherwise specified.

[0027] It is understood that in the embodiments of this application, "B corresponding to A" means that there is a correspondence between A and B, and B can be determined based on A. Determining B based on A does not mean that B can be determined solely based on A; B can also be determined based on A and / or other information.

[0028] The following is a brief introduction to some relevant content, terms, or nouns involved in this application.

[0029] Example 1 Reference Figures 1 to 9 A secondary injection molding manufacturing process for CGM guide pin assemblies includes the following steps: S1, The metal sheet is stamped to form a needle 1 with a preset structure; S2, perform composite injection molding to encapsulate the needle body 1 to form a plastic body 3 in a predetermined area of ​​the needle body 1; The plastic body 3 includes a first plastic block 31 and a second plastic block 32. The second plastic block 32 at least partially covers the first plastic block 31. The second plastic block 32 and the first plastic block 31 form an integral structure, and the Shore hardness of the second plastic block 32 and the first plastic block 31 are not equal. S3, after the glue block cools, the guide pin assembly is obtained.

[0030] The unequal Shore hardness specifically means that the Shore hardness of the second adhesive block 32 is less than that of the first adhesive block 31, and the adhesive blocks are cooled after both the first adhesive block 31 and the second adhesive block 32 have cooled and solidified.

[0031] With the above-described structural design, during use, a needle body 1 with a preset structure is formed by stamping a metal plate, and then composite injection molding is performed to form a plastic body 3 in a preset area of ​​the needle body 1, consisting of a first plastic block 31 and a second plastic block 32 with different Shore hardness and an integral structure. Finally, the guide needle assembly is obtained by cooling. This achieves integrated composite coating using two plastics with different hardnesses, so that the plastic body 3 is firmly bonded to the needle body 1, while providing cushioning, shock absorption and sealing through the softer plastic block, and structural support and anti-deformation through the harder plastic block. This effectively improves the structural reliability of the guide needle assembly, as well as the puncture stability and safety of use.

[0032] The metal sheet is a single strip made of medical-grade 304, 316, or 316L stainless steel.

[0033] Specifically, the needle body 1 includes a base 101 and a bent portion 102 formed by bending and extending from the upper end of the base 101 in the width direction. One end of the base 101 in the length direction is provided with a needle tip 103. The needle body 1 is provided with a first groove 11 and a protrusion 12. The first groove 11 and the protrusion 12 are located on the needle body 1 at the end away from the needle tip 103, and the protrusion 12 is disposed adjacent to the first groove 11. In S2, the plastic body 3 is located on the end of the needle body 1 away from the needle tip 103. The first groove 11 and the protrusion 12 are concentrated at the tail end away from the needle tip 103, and the plastic body 3 is directly injection molded to cover this tail end area. The groove and the protrusion form a high and low locking structure on the surface of the needle body. After the molten rubber enters the groove and covers the protrusion and solidifies, even if it is repeatedly pushed, pulled or twisted, the plastic body 3 is difficult to loosen or rotate from the needle body 1, thus improving the connection stability.

[0034] The bent portion 102 and the protrusion 12 are also provided with an arc-shaped segment 1020, which is located close to the first groove 11. Figure 6 As shown, the arc segment 1020 is an arc-shaped bend or a strip groove formed in the bend 102. Preferably, the length direction of the bend or the strip groove is not perpendicular to the length direction of the base 101. The strip groove is only used in other embodiments.

[0035] Specifically, the first rubber block 31 is formed on the needle body 1 by a first injection molding process to form a rigid support structure; the second rubber block 32 is formed on the first rubber block 31 by a second injection molding process to form a soft contact structure; the second rubber block 32 and the first rubber block 31 are fused together by a second injection molding process to form an integral connection structure. The process is carried out in two injection molding processes. First, the rigid first rubber block 31 is made as a force-bearing skeleton connected to the needle body 1, and then the soft second rubber block 32 is made to cover the skeleton. Moreover, during the second injection molding, the soft rubber is fused to the already shaped rigid rubber surface at a high temperature. There are no physical gaps between the two layers of rubber, which effectively avoids the situation of delamination and peeling in the later stage.

[0036] The second adhesive block 32 is made of TPU or TPE or similar materials.

[0037] Specifically, the first plastic block 31 and the second plastic block 32 are formed on the needle body 1 through a composite injection molding process. The first plastic block 31 uses a hard plastic material to form a support structure, and the second plastic block 32 uses a soft plastic material to form a buffer contact structure. The first plastic block 31 and the second plastic block 32 are melted to form an integral structure during the composite injection molding process. The hard plastic and the soft plastic are directly made into an inseparable whole by composite injection molding. The hard plastic is responsible for ensuring that the entire plastic head does not easily deform, and the soft plastic is responsible for providing flexible buffering when in contact with the skin or other instruments. The two layers of materials are heat-fused during molding and completely fused together after cooling. Even with long-term use, there will be no problem of separation between the hard and soft plastics.

[0038] Specifically, the stamping steps in S1 include: S11, punching the external metal plate to form the outline plate of the needle body 1, and forming a first groove 11 and a protrusion 12 on the outline plate of the needle body 1. The first groove 11 penetrates the outline plate of the needle body 1 along the thickness direction, and the protrusion 12 is formed in the area of ​​the needle body 1 on the side of the first groove 11. S12, the outline plate of the needle body 1 is pressed to form the needle body 1. The needle body 1 includes a base 101 and a bent portion 102 that extends from the width direction of the base 101. The first groove 11 has a preset shape and extends from the base 101 to the bending portion 102. The first groove 11 and the protrusion 12 are processed in one go during the stage of punching out the outline plate of the needle body 1. Moreover, the groove penetrates the material plate and spans from the base 101 to the bending portion 102. After pressing, this through groove spans multiple different planes of the needle body 1. During subsequent injection molding, the rubber material can flow into the through groove to connect the inner and outer sides of the bending rubber into one, which is equivalent to using a rubber connecting bridge to firmly lock the two sides of the plastic material in the bending area of ​​the needle body together, while preventing gas from flowing directly through the linear base 101 or bending portion 102.

[0039] The outline plate of the needle body 1 is the plate structure of the needle body 1 before it is pressed.

[0040] Specifically, the stamping step in S1 also includes: S13, After punching to form the outline plate of the needle body 1, the outline plate of the needle body 1 is polished. The polishing operation is completed before the outline plate of the needle body 1 is pressed. S14, the pressed needle body 1 is processed to form a deformable structure on the protrusion 12 and / or the bending part 102 to change the spatial shape of the needle body. Before pressing, grinding is performed to remove burrs and micro-notches from the punched surface, making the injection-molded area on the surface of the needle body 1 smoother and cleaner, reducing the risk of breakage caused by stress concentration. After pressing, another local forming process is performed on the protrusion 12 or the bending part 102 to create a deformable structure in spatial shape, which can further enhance the resistance of the plastic body 3 to push-pull and torsional forces.

[0041] Specifically, the stamping step in S1 also includes: S111, punching the outer material plate to form a belt body 2, and forming an ear 21 on the belt body 2. The outline plate of the needle body 1 is provided on the belt body 2. At least two ears 21 are provided. The ears 21 are provided on the inner wall of the belt body 2 in the length direction and / or on the inner wall of the belt body 2 in the width direction. S121, the two ears 21 are bent and formed on opposite sides in the thickness direction of the strip body 2. The strip body 2 connecting the needle body contour plate is punched out on the material plate at the same time, and at least two ears 21 are made on the inner wall of the strip body 2. Then they are bent in opposite directions in the thickness direction of the strip body. In this way, in subsequent processing and handling, the folded ears can provide support and preset gap for the entire strip on the injection mold or conveyor track.

[0042] The ear portion 21 is referred to in the industry as a protective angle. The technical solution is to change a set of protective angles from being set along the length of a single strip body 2 to being set along the width of a single strip body 2. This is because setting the protective angle along the length of a single strip body 2 will affect the mechanical strength of the connection between the strip body 2 and the needle body 1 (when the protective angle set at the connection between the strip body 2 and the needle body 1 is set along the length of a single strip body 2, the width pin distance of the strip body 2 will be increased. At the same time, in order to avoid the protective angle affecting the outline plate of the needle body 1, the distance in the length direction of the strip body 2 also needs to be increased). In addition, it will generate more waste material, which is not conducive to reducing production costs. The main function of the protective angle is to support the distance between the strips when the entire strip body 2 (composed of several strip bodies 2 arranged in a strip array) is wound.

[0043] Specifically, the belt body 2 is provided with a first ear group and a second ear group, which are respectively located at both ends of the belt body 2 in the length direction; The first ear group and the second ear group each include two ears 21, and the two ears 21 in the same ear group are bent into shape on opposite sides in the thickness direction of the belt body 2. Among them, the two ears 21 in the first ear group extend along the length direction of the belt body 2, and the two ears 21 in the second ear group are located at both ends of the width direction of the belt body 2 and extend along the width direction of the belt body 2. The two ears 21 in the second ear group are located at one end of the belt body 2 along its length to connect to the needle body 1. A set of ears that fold back to both sides are arranged at each end of the belt body 2. The front ear is arranged along the length of the belt body and the rear ear is arranged along the width of the belt body. In particular, the ear near the needle body 1 is made into a horizontally folded structure, which is equivalent to setting two additional three-dimensional support legs at the "root" of the needle body 1. During transmission and injection molding, these two support legs can withstand greater clamping force and injection pressure. The needle body will not lift or deviate due to unilateral force, further ensuring the positional accuracy of injection molding.

[0044] Specifically, the manufacturing process also includes punching the needle body 1 to form the needle tip 103. The punching step of the needle body 1 is located in S14 after the deformation structure of the needle body 1 contour plate is formed, or after the injection molding of plastic body 3 onto the needle body 1. Arranging the punching of the needle tip after all forming processes and injection molding is completed can avoid the needle tip being damaged by bumps during the early multiple punching, forming, grinding and high-temperature injection molding processes, so that the final needle tip maintains its initial sharpness, making the entry point easier during puncture and the tearing of the skin or tissue is relatively smaller. At the same time, without the needle tip during injection molding, the operation safety of workers and molds is also higher.

[0045] Specifically, the needle body 1 includes a base 101 and a bent portion 102 extending from the width of the base 101. One end of the base 101 in the length direction is provided with a needle tip 103, and the end of the base 101 away from the needle tip 103 is provided with a connecting portion 13. The width dimension of the connecting portion 13 near the end of the base 101 is smaller than the width dimension of the connecting portion 13 away from the base 101. A second groove 14 is provided on the connecting portion 13. The second groove 14 penetrates the connecting portion 13 along the thickness direction. A connecting portion 13 with a narrow root and a wide end is provided between the tail end of the needle body 1 and the belt body 2, and a through second groove 14 is opened on it. The narrow root structure can effectively prevent airflow from penetrating the plastic body 3 along the needle body 1, while the wide end ensures sufficient connection strength with the belt body 2, so as not to break accidentally in the previous multiple processes. The through second groove 14 further weakens the movement of airflow along the straight path.

[0046] The first adhesive block 31 has a block 311 at one end near the needle tip 103, and the block 311 has a columnar structure. The end of the block 311 away from the first adhesive block 31 has a third groove 3111 recessed therein, and the third groove 3111 extends circumferentially along the block 311. The third groove 3111 is non-linearly distributed relative to the axis of the block 311, so that different groove segments of the third groove 3111 are located at different positions in the axial direction of the block 311. The third groove 3111 is at least partially arc-shaped and extends around the central axis of the block 311.

[0047] The first adhesive block 31 has a disc 3112 at one end near the needle tip 103. A fourth groove 312 is formed between the disc 3112 and the first adhesive block 31. The second adhesive block 32 has a ring 321 for receiving the fourth groove 312. The ring 321 is used to limit the second adhesive block 32 and the first adhesive block in the length direction of the central axis of the block 311.

[0048] The first rubber block 31 is also provided with a fifth groove 313 and a sixth groove 314. The fifth groove 313 is connected to the fourth groove 312. The second rubber block 32 is provided with a protrusion 322 for receiving the fifth groove 313. The fifth groove 313 is used to limit the rotation of the second rubber block 32 and the first rubber block in the circumferential direction of the block 311.

[0049] Two first grooves 11 are provided, and the second groove 14 is arranged collinearly with the two first grooves 11.

[0050] Example 2 Embodiment 2 of this application can be implemented alone or in combination with Embodiment 1 described above, and this application does not impose any restrictions.

[0051] A secondary injection molding manufacturing process for CGM guide pin assemblies includes the following steps: S1, The metal sheet is stamped to form a needle 1 with a preset structure; S2, perform composite injection molding to encapsulate the needle body 1 to form a plastic body 3 in a predetermined area of ​​the needle body 1; The plastic body 3 includes a first plastic block 31 and a second plastic block 32. The second plastic block 32 at least partially covers the first plastic block 31. The second plastic block 32 and the first plastic block 31 form an integral structure, and the Shore hardness of the second plastic block 32 and the first plastic block 31 are not equal. S3, cooling yields the guide pin assembly.

[0052] The first adhesive block 31 has a block 311 at one end near the needle tip 103, and the block 311 has a columnar structure. The end of the block 311 away from the first adhesive block 31 has a third groove 3111 recessed therein, and the third groove 3111 extends circumferentially along the block 311. The third groove 3111 is non-linearly distributed relative to the axis of the block 311, so that different groove segments of the third groove 3111 are located at different positions in the axial direction of the block 311. The third groove 3111 is at least partially arc-shaped and extends around the central axis of the block 311.

[0053] The first adhesive block 31 has a disc 3112 at one end near the needle tip 103. A fourth groove 312 is formed between the disc 3112 and the first adhesive block 31. The second adhesive block 32 has a ring 321 for receiving the fourth groove 312. The ring 321 is used to limit the second adhesive block 32 and the first adhesive block in the length direction of the central axis of the block 311.

[0054] The first rubber block 31 is also provided with a fifth groove 313 and a sixth groove 314. The fifth groove 313 is connected to the fourth groove 312. The second rubber block 32 is provided with a protrusion 322 for receiving the fifth groove 313. The fifth groove 313 is used to limit the rotation of the second rubber block 32 and the first rubber block in the circumferential direction of the block 311.

[0055] The first rubber block 31 is also provided with a cutting groove, which is located at the sixth groove 314 and connected to the sixth groove 314. The fifth groove 313 is connected to the cutting groove and the fourth groove 312 via the sixth groove 314, so that the second rubber block 32 can seal the gap in the cutting groove while providing buffering, shock absorption and sealing.

[0056] A secondary injection molding manufacturing process for a CGM guide pin assembly also includes: S20, after the first plastic block 31 is injection molded, the connecting structure of the needle body 1 and the belt body 2 located in the cutting groove is separated by the cutting mechanism, and then the second plastic block 32 is injection molded. The second plastic block 32 is also provided with a disc-shaped protrusion on the side near the needle tip 103, and the protrusion and the second plastic block 32 are smoothly transitioned.

[0057] Both ends of the needle body 1 along its length are connected to the belt body 2 before being punched. After the second plastic block 32 is injected, the needle tip 103 of the needle body 1 can be cut and formed and then polished.

[0058] Example 3 This application’s third embodiment is used in conjunction with the foregoing first and / or second embodiments, and this application does not impose any limitations.

[0059] The first adhesive block 31 forms the main support structure, and the first adhesive block 31 is recessed with a receiving groove on the skin-contact side; The second adhesive block 32 is embedded in the receiving groove, and at least part of the second adhesive block 32 protrudes from the receiving groove to form an elastic contact part. The receiving groove is T-shaped. The second adhesive block 32 is at least partially surrounded by the first adhesive block 31 to limit the deformation of the second adhesive block 32 in directions other than the skin-contact side.

[0060] The first adhesive block 31 has a radial groove that is connected to the receiving groove. The radial groove serves as an adhesive injection port and also restricts the second adhesive block 32 from moving in the radial and circumferential directions.

[0061] In addition to the radial groove serving as the colloid injection port, there can be multiple arc-shaped radial grooves, with the arc-shaped radial grooves having opposite bending directions or unequal curvatures.

[0062] The above descriptions provide one or more embodiments in conjunction with specific details, but do not imply that the specific implementation of the present invention is limited to these descriptions. Any methods or structures that are similar to or identical to those of the present invention, or any technical deductions or substitutions made based on the concept of the present invention, should be considered within the scope of protection of the present invention.

Claims

1. A secondary injection molding manufacturing process for a CGM guide pin assembly, characterized in that, Includes the following steps: S1, the metal sheet is stamped to form a needle with a preset structure (1). S2, perform composite injection molding on the needle body (1) to form a plastic body (3) in a preset area of ​​the needle body (1). The plastic body (3) includes a first plastic block (31) and a second plastic block (32). The second plastic block (32) is at least partially covered by the first plastic block (31). The second plastic block (32) and the first plastic block (31) form an integral structure. The Shore hardness of the second plastic block (32) and the first plastic block (31) are not equal. S3, after the glue block cools, the guide pin assembly is obtained.

2. The secondary injection molding manufacturing process for a CGM guide pin assembly according to claim 1, characterized in that: The needle body (1) includes a base (101) and a bent portion (102) formed by bending and extending from the upper end of the base (101) in the width direction. One end of the base (101) in the length direction is provided with a needle tip (103). The needle body (1) is provided with a first groove (11) and a protrusion (12). The first groove (11) and the protrusion (12) are located on the needle body (1) away from the needle tip (103), and the protrusion (12) is provided adjacent to the first groove (11). In S2, the plastic body (3) is located on the needle body (1) at one end away from the needle tip (103).

3. The secondary injection molding manufacturing process for a CGM guide pin assembly according to claim 1 or 2, characterized in that: The first rubber block (31) is coated onto the needle body (1) by the first injection molding to form a rigid support structure; the second rubber block (32) is coated onto the first rubber block (31) by the second injection molding to form a soft contact structure; the second rubber block (32) and the first rubber block (31) are welded together by the second injection molding to form an integral connection structure.

4. The secondary injection molding manufacturing process for a CGM guide pin assembly according to claim 1 or 2, characterized in that: The first rubber block (31) and the second rubber block (32) are formed on the needle body (1) by a composite injection molding process; the first rubber block (31) is made of hard rubber material to form a support structure, and the second rubber block (32) is made of soft rubber material to form a buffer contact structure; the first rubber block (31) and the second rubber block (32) are melted to form an integral structure during the composite injection molding process.

5. The secondary injection molding manufacturing process for a CGM guide pin assembly according to claim 1, characterized in that, The stamping steps in S1 include: S11, punching the external metal plate to form the outline plate of the needle body (1), and forming a first groove (11) and a protrusion (12) on the outline plate of the needle body (1). The first groove (11) penetrates the outline plate of the needle body (1) along the thickness direction, and the protrusion (12) is formed in the area of ​​the needle body (1) on the side of the first groove (11). S12, the outline plate of the needle body (1) is pressed to form the needle body (1), the needle body (1) includes a base (101) and a bent portion (102) that extends from the width direction of the base (101). The first groove (11) has a preset shape and extends from the base (101) to the bend (102).

6. The secondary injection molding manufacturing process for a CGM guide pin assembly according to claim 5, characterized in that, The stamping process in S1 also includes: S13, after punching to form the outline plate of the needle body (1), the outline plate of the needle body (1) is polished. The polishing operation is completed before the outline plate of the needle body (1) is pressed. S14, the formed needle body (1) is processed to form a deformable structure on the protrusion (12) and / or the bending part (102) to change the spatial shape of the needle body.

7. The secondary injection molding manufacturing process for a CGM guide pin assembly according to claim 5, characterized in that, The stamping process in S1 also includes: S111, punching the outer material plate to form a belt (2), and forming an ear (21) on the belt (2), the outline plate of the needle body (1) is provided on the belt (2), and at least two ears (21) are provided, and the ears (21) are provided on the inner wall in the length direction of the belt (2) and / or on the inner wall in the width direction of the belt (2); S121, the two ears (21) are bent and shaped on opposite sides in the thickness direction of the belt body (2).

8. The secondary injection molding manufacturing process for a CGM guide pin assembly according to claim 7, characterized in that: The belt body (2) is provided with a first ear group and a second ear group, which are respectively located at both ends of the belt body (2) in the length direction; The first ear group and the second ear group each include two ears (21), and the two ears (21) in the same ear group are bent into shape on opposite sides in the thickness direction of the belt body (2); Among them, the two ears (21) in the first ear group extend along the length direction of the belt (2), and the two ears (21) in the second ear group are located at both ends of the width direction of the belt (2) and extend along the width direction of the belt (2). The two ears (21) in the second ear group are located at one end of the belt body (2) along its length for connecting the needle body (1).

9. The secondary injection molding manufacturing process for a CGM guide pin assembly according to claim 6, characterized in that: The manufacturing process also includes punching the needle body (1) to form the needle tip (103). The punching step of the needle body (1) is located in S14 after the deformation structure is formed on the outline plate of the needle body (1), or after the injection molding of plastic (3) onto the needle body (1).

10. The secondary injection molding manufacturing process for a CGM guide pin assembly according to claim 1, characterized in that: The needle body (1) includes a base (101) and a bent portion (102) that extends from the width of the base (101). One end of the base (101) in the length direction is provided with a needle tip (103). The end of the base (101) away from the needle tip (103) is provided with a connecting portion (13). The width dimension of the connecting portion (13) near the end of the base (101) is smaller than the width dimension of the connecting portion (13) away from the end of the base (101). A second groove (14) is provided on the connecting portion (13). The second groove (14) penetrates the connecting portion (13) along the thickness direction of the connecting portion (13).

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