A secondary injection molding manufacturing process for a tape-based CGM guide pin assembly

Abstract

The application relates to a secondary injection molding production and manufacturing process of a material belt type CGM guide needle assembly, which comprises the following steps: stamping a material plate to form a needle part and a material belt piece; the needle part comprises a needle tip part and a needle body part, and the needle body part is connected with the needle tip part and the material belt piece respectively; first injection is performed on one end of the needle body part close to the material belt piece to form a first glue head part; second injection is further performed to form a second glue head part, the second glue head part wraps one side of the first glue head part close to the needle tip part, and the hardness of the first glue head part is greater than that of the second glue head part; and the needle body part after the secondary injection is separated from the material belt piece to obtain a guide needle. According to the application, the material plate is first stamped to form the material belt piece and the needle part, then the first glue head part and the second glue head part are formed through injection, the hardness of the second glue head part is smaller than that of the first glue head part, the first glue head part is wrapped through the relatively soft second glue head part, the second glue head part can be tightly matched with a protection end of a CGM system, good air tightness is ensured, and the accuracy of a dynamic blood glucose monitoring system is effectively improved.

Description

Technical Field

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

[0002] The CGM guide needle is a key component of a continuous glucose monitoring (CGM) system, primarily used to accurately and quickly implant a sensor subcutaneously for long-term monitoring of glucose levels in interstitial fluid. The CGM guide needle consists of a needle and a rubber tip, with the rubber tip attached to the needle via injection molding. Currently, to ensure the monitoring accuracy of the CGM system, airtightness is crucial during use to avoid significant deviations in monitoring results due to poor airtightness. One existing technology achieves airtightness through interference fit, but this method is costly, inefficient, and time-consuming to assemble. Another existing technology involves adding a waterproof ring to the rubber tip of the guide needle, utilizing the ring's fit with the CGM system's protective end to create good airtightness. However, this method is costly to produce, increases the overall size, and is more susceptible to damage to the needle tip, leading to a high defect rate. Summary of the Invention

[0003] In order to overcome the shortcomings and deficiencies of the existing technology, the purpose of this invention is to provide a secondary injection molding manufacturing process for a strip-type CGM guide pin assembly.

[0004] To achieve the above objectives, the present invention provides a secondary injection molding manufacturing process for a strip-type CGM guide pin assembly, comprising the following steps: The material plate is stamped to form a needle part and a strip of material; wherein, the needle part includes a needle tip part and a needle body part, the needle tip part is connected to one end of the needle body part, and the other end of the needle body part is connected to the strip of material. The first injection molding is performed on the end of the needle body near the material strip, and the first glue head is formed at the end of the needle body away from the needle tip. A second injection molding is performed on the end of the needle body near the material strip, forming a second plastic head at the end of the needle body away from the needle tip. The second plastic head wraps around the side of the first plastic head near the needle tip, and the hardness of the first plastic head is greater than that of the second plastic head. The guide pin is obtained by separating the needle body from the material strip after the second injection molding.

[0005] The beneficial effects of this invention are as follows: The manufacturing process of this invention, a strip-type CGM guide needle assembly, involves first stamping a material plate to form a strip and a needle portion, and then performing two injection molding processes to form a first and a second rubber head. The second rubber head wraps around the side of the first rubber head near the needle tip. The second rubber head is softer than the first rubber head, and this softer head provides better resilience and compressibility, allowing it to match the shape of the first rubber head. The second rubber head can also fit tightly against the protective end of the CGM system. In practical applications, the protective end of the CGM system is primarily a sleeve. The cooperation between the second rubber head and the sleeve creates a sealed space, effectively preventing gas leakage through the gap between the first rubber head and the needle body, ensuring good airtightness. Afterwards, sterilization is performed under vacuum conditions to form a sterile barrier, effectively improving the accuracy of subsequent use of the dynamic blood glucose monitoring system and preventing infection at the implantation site due to gas or microorganisms. Directly injection molding the second glue head can effectively avoid damaging the needle tip and effectively reduce production costs.

[0006] Optionally, stamping the material plate to form the needle and the strip also includes the following steps: The material plate is stamped to form needle-shaped pieces and strip pieces; Polish the needle body to remove burrs; The two sides of the needle body sheet in the width direction are bent to form a bent section. The two bent sections and the bottom of the needle body sheet are combined to form the needle body section. The needle body section is used to accommodate the biological probe from the outside. One end of the needle body is ground and sharpened to form the needle tip; A pre-cut section is formed by stamping at the end of the needle body away from the needle tip. The pre-cut section is used to separate the needle body from the material strip after the secondary injection molding is completed.

[0007] After the needle body is stamped to form the needle sheet, it is polished to remove burrs. Then, it is bent to form the needle body section. Polishing the needle body section makes it smooth, reducing puncture resistance and tissue damage, minimizing pain during puncture, and improving user comfort. It also provides precise positioning points for subsequent grinding and sharpening processes, improving processing accuracy. Furthermore, sharpening the needle body after polishing to form the needle tip ensures its sharpness and facilitates successful puncture. A pre-cut section is formed at the end of the needle body section away from the needle tip, allowing for rapid separation from the connecting sheet after secondary injection molding without complex processes, thus improving processing efficiency.

[0008] Optionally, the process of stamping the material plate to form the needle sheet and the strip sheet further includes the following steps: Multiple protrusions and grooves are formed by stamping both sides of the needle body sheet connecting the strip sheet; Multiple protrusions are arranged along the length of the needle body piece, and multiple grooves are arranged along the length of the needle body piece; the protrusions and grooves are positioned opposite to the first adhesive head, and the multiple grooves and multiple protrusions are used to bend the two sides of the needle body piece in the width direction to form a bent part, which then cooperates with the first adhesive head to seal the needle body part.

[0009] By means of multiple protrusions and grooves arranged along the length direction, after bending the needle body sheet on both sides in the width direction, it can form a tight fit with the first glue head formed after injection molding, which can prevent gas flow and improve air tightness.

[0010] Optionally, bending both sides of the needle body sheet in the width direction to form a bent portion, and the two bent portions and the bottom of the needle body sheet enclosing each other to form a needle body portion, further includes the following steps: The guide slope is formed by processing the side of the two bends near the needle tip, and the thickness of the guide slope gradually increases from the needle tip to the needle body.

[0011] Setting a guide bevel reduces resistance during puncture, lowers frictional resistance when the guide needle enters the skin, and reduces user pain. Furthermore, the guide bevel has a certain angle; during puncture, due to the different frictional forces between the guide bevel and the skin, the needle tip will slightly deflect in the opposite direction to the guide bevel. The direction of the needle tip can be controlled by changing the direction of the guide bevel, thus adjusting the puncture direction.

[0012] Optionally, the bottom of the needle sheet and the connection between the bent portion form an arc surface.

[0013] The bottom of the needle body and the connection point of the bend are formed into an arc surface. The smooth arc surface can reduce the resistance of puncture, further reduce the user's pain, and improve comfort.

[0014] Optionally, stamping the material plate to form the needle and the strip also includes the following steps: The material plate is stamped to form a strip and a connecting part; the connecting part includes a first connecting part and a second connecting part, the two ends of the first connecting part are respectively connected to the strip, one end of the second connecting part is connected to the first connecting part, and the other end of the second connecting part is connected to the strip.

[0015] The connecting part connects the strip, which can improve the strength of the strip and prevent it from breaking during processing.

[0016] Optionally, stamping the material plate to form the needle and the strip further includes the following steps: stamping the material plate to form protective feet, wherein the protective feet are used to protect the needle; the protective feet include a first protective connecting part and a second protective connecting part, the two ends of the first protective connecting part are respectively connected to one end of the strip and the second protective connecting part, the second protective connecting part is arranged parallel to the strip, and multiple protective feet are arranged around the needle.

[0017] Multiple protective feet are provided around the needle. The first protective connecting part is connected to the material strip and the second protective connecting part. The second protective connecting part is arranged parallel to the material strip. The protective feet support to form a protective space. When the material is placed, it can protect the guide needle and avoid collision with other objects or platforms and damage.

[0018] Optionally, the protective feet include a first protective foot, a second protective foot, a third protective foot, and a fourth protective foot. The first and second protective feet are located on the side of the needle tip away from the needle body, and the third and fourth protective feet are located on both sides of the needle body. The first and third protective feet are arranged opposite to each other, and the second and fourth protective feet are arranged opposite to each other. The first and fourth protective feet protrude onto the material strip in a first direction, and the second and third protective feet protrude onto the material strip in a second direction, with the first and second directions being opposite.

[0019] The protective feet include a first protective foot, a second protective foot, a third protective foot, and a fourth protective foot. The first and fourth protective feet protrude in a first direction, while the second and third protective feet protrude in a second direction. The first and second directions are opposite, and the protective feet protrude in two different directions, thus forming a protective space around the guide pin. The guide pin is located in the middle of the protective space, which can effectively prevent other objects from entering the protective space and colliding with the guide pin, thereby preventing damage to the guide pin.

[0020] Optionally, performing a first injection molding on the needle body to form a first adhesive head at the end of the needle body away from the needle tip, and performing a second injection molding on the needle body to form a second adhesive head at the end of the needle body away from the needle tip, further includes the following steps: The first plastic head is formed by injection molding the end of the needle body away from the needle tip using the first mold. The second plastic head is formed by injection molding the end of the needle body away from the needle tip using the second mold; the second plastic head covers the side of the first plastic head near the needle tip.

[0021] Injection molding is performed using two separate molds, a first mold and a second mold, eliminating the need for complex molds and reducing mold and equipment costs. Separate maintenance is also possible; even if one mold fails, only the damaged mold needs to be replaced, reducing overall maintenance costs. Furthermore, performing injection molding with two separate molds allows sufficient time for the first injection to cool and solidify, ensuring the first injection head does not deform during the second injection and guaranteeing a high yield rate for the guide pins.

[0022] Optionally, performing a first injection molding on the needle body to form a first adhesive head at the end of the needle body away from the needle tip, and performing a second injection molding on the needle body to form a second adhesive head at the end of the needle body away from the needle tip, further includes the following steps: The first injection assembly of the double-shot mold is used to perform the first injection molding on the end of the needle body part away from the needle tip in the mold core to form the first glue head. Rotate or move the mold core and use the second injection assembly of the double injection mold to perform a second injection on the side of the needle body away from the needle tip after the first injection to form a second glue head; the second glue head wraps around the side of the first glue head near the needle tip.

[0023] Using a dual-shot mold for secondary injection molding saves time transferring material strips and improves production efficiency. Furthermore, when the first injection head is formed and the second injection head is formed, the first injection head has not yet fully cooled, resulting in a tighter connection and better airtightness between the two heads. It also allows for precise positioning of the two injection points, leading to higher product accuracy for the guide pins. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall process for secondary injection molding manufacturing of a strip-type CGM guide pin assembly according to the present invention. Figure 2 This is a schematic diagram of the steps of stamping a material plate to form a needle and a strip sheet according to the present invention; Figure 3 This is a schematic diagram illustrating the steps of performing a first injection molding of the needle body portion to form a first adhesive head at the end of the needle body portion away from the needle tip portion, and performing a second injection molding of the needle body portion to form a second adhesive head at the end of the needle body portion away from the needle tip portion, according to the present invention. Figure 4 This is a schematic diagram of the secondary injection molding manufacturing process of a strip-type CGM guide pin assembly according to the present invention. Figure 5 This is a schematic diagram of the material strip structure after the first injection molding of the present invention; Figure 6 This is a schematic diagram of the material strip structure after the second injection molding of the present invention; Figure 7 This is a schematic diagram of the material strip and guide pin of the present invention; Figure 8 This is a schematic diagram of the guide pin structure of the present invention; Figure 9 This is a schematic diagram of the material strip of the present invention; Figure 10 This is another structural schematic diagram of the material strip of the present invention; Figure 11 This is a schematic diagram of the needle part of the present invention; Figure 12 This is another schematic diagram of the needle part of the present invention.

[0025] The reference numerals in the figures include: 1. Material plate; 11. Material strip; 12. Needle body; 13. Material pre-cut section; 14. Connecting part; 141. First connecting part; 142. Second connecting part; 15. Protective foot; 151. First protective connecting part; 152. Second protective connecting part; 153. First protective foot; 154. Second protective foot; 155. Third protective foot; 156. Fourth protective foot; 2. Guide needle; 21. Needle part; 211. Needle tip; 212. Needle body part; 213. Bending part; 214. Bevel; 215. Protrusion; 216. Groove; 217. Guide bevel; 218. Arc surface; 22. Glue head; 221. First glue head; 2211. Assembly groove; 2212. Positioning groove; 222. Second glue head. Detailed Implementation

[0026] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0027] Please see Figures 1 to 12 As shown, the present invention provides a secondary injection molding manufacturing process for a strip-type CGM guide pin assembly, comprising the following steps: The material plate 1 is stamped to form a needle part 21 and a material strip 11; wherein, the needle part 21 includes a needle tip part 211 and a needle body part 212, the needle tip part 211 is connected to one end of the needle body part 212, and the other end of the needle body part 212 is connected to the material strip 11. The needle body 212 is first injection molded at the end near the material strip 11, and a first glue head 221 is formed at the end of the needle body 212 away from the needle tip 211. A second injection molding is performed on the end of the needle body 212 near the material strip 11, and a second plastic head 222 is formed at the end of the needle body 212 away from the needle tip 211. The second plastic head 222 wraps around the side of the first plastic head 221 near the needle tip 211. The hardness of the first plastic head 221 is greater than that of the second plastic head 222. The guide pin 2 is obtained by separating the needle body 212, which has been completed by secondary injection molding, from the material strip 11.

[0028] Please see Figure 8The guide needle 2 includes a needle portion 21 and a rubber head 22. The rubber head 22 includes a first rubber head 221 and a second rubber head 222. The needle portion 21 can be made of stainless steel, such as 304 stainless steel or 316 stainless steel, both of which are medical-grade stainless steel. Stainless steel has good mechanical strength, bending resistance, and good corrosion resistance. Furthermore, stainless steel can achieve a good surface finish after processing, reducing tissue damage to the user. The first rubber head 221 is a hard rubber portion, which can be made of PC (polycarbonate) or ABS (acrylonitrile-butadiene-styrene). Using PC as the hard rubber portion provides good transparency, facilitating irradiation sterilization of the guide needle 2. It also has good heat resistance and toughness, ensuring the stability of the needle portion 21 during puncture and preventing breakage. It is also heat-resistant and easy to sterilize. Using ABS as the hard rubber portion facilitates injection molding, has a low shrinkage rate, and possesses good rigidity and impact resistance. The second adhesive head 222 is a soft adhesive portion that wraps around the side of the first adhesive head 221 near the needle tip 211, effectively preventing gases or microorganisms from passing through the gap between the adhesive head 222 and the needle tip 211. The soft adhesive portion can be made of TPU (thermoplastic polyurethane elastomer), TPE (thermoplastic elastomer), or silicone. Through its resilience and compressibility, the soft adhesive portion allows the second adhesive head 222 to fit tightly against the protective end of the CGM system, ensuring good airtightness. Furthermore, all materials are hypoallergenic, effectively preventing allergic reactions from contact.

[0029] The present invention discloses a secondary injection molding manufacturing process for a strip-type CGM guide pin assembly. First, a strip sheet 11 and a needle portion 21 are formed by stamping a material plate 1. Then, a first plastic head 221 and a second plastic head 222 are formed through two injection molding processes. The second plastic head 222 wraps around the side of the first plastic head 221 near the needle tip 211 of the needle portion 211. The hardness of the second plastic head 222 is less than that of the first plastic head 221, meaning the second plastic head 222 is softer. By wrapping the first plastic head 221 with the softer second plastic head 222, the second plastic head 222 exhibits better resilience and compressibility, enabling it to interact with the first... The shape of the first adhesive head 221 is matched, and the second adhesive head 222 can fit tightly with the protective end of the CGM system. In practical applications, the protective end of the CGM system is mainly in the form of a sleeve. The cooperation between the second adhesive head 222 and the sleeve forms a sealed space, which can effectively prevent gas from leaking through the needle body 212 from the gap between the first adhesive head 221 and the needle body 212. The airtightness is good. Afterwards, sterilization is carried out in a vacuum environment to form a sterile barrier, which can effectively improve the accuracy of the subsequent use of the continuous glucose monitoring system and prevent infection of the implantation site due to gas or microorganisms. Directly injection molding the second adhesive head 222 can effectively avoid damage to the needle tip and effectively reduce production costs.

[0030] Please see Figure 2 and Figure 4 The process of stamping the material plate 1 to form the needle part 21 and the material strip 11 also includes the following steps: The material plate 1 is stamped to form a needle body sheet 12 and a material strip sheet 11; Polish the needle body plate 12 to remove burrs from it; The two sides of the needle body sheet 12 in the width direction are bent to form a bent portion 213. The two bent portions 213 and the bottom of the needle body sheet 12 are enclosed to form a needle body portion 212. The needle body portion 212 is used to accommodate the biological probe from the outside. One end of the needle body 12 is ground and sharpened to form the needle tip 211; A material pre-break section 13 is formed by stamping at one end of the needle body 212 away from the needle tip 211. The material pre-break section 13 is used to separate from the material strip 11 after the needle body 212 is injected for secondary injection.

[0031] After the needle body 12 is formed by stamping, the burrs on the needle body 12 are removed by polishing, and then it is bent to form the needle body portion 212. After polishing, the needle body portion 212 becomes smooth, which can reduce puncture resistance and tissue damage, reduce pain during puncture, improve user comfort, and provide a precise positioning point for subsequent grinding and sharpening processes, improving processing accuracy. At the same time, after polishing, the needle body 12 is sharpened to form the needle tip 211, which can ensure the sharpness of the needle tip 211 and ensure smooth puncture. At the end of the needle body portion 212 away from the needle tip 211, a connecting material pre-cutting portion 13 is formed, which can be quickly separated from the connecting material after the second injection molding without complicated processes, improving processing efficiency.

[0032] Please see Figures 4 to 6Specifically, after stamping the sheet metal, a needle body 12 and a strip 11 are formed. The strip 11 is frame-shaped, and the needle body 12 is located in the middle of the frame structure of the strip 11. The needle body 12 is elongated, and one end of the needle body 12 is connected to the inner side of the strip 11. After stamping, the needle body 12 is polished to remove burrs and make it smooth. Then, the needle body 12 is bent along both sides of its length to form a bent portion 213. The bent portion 213 and the bottom of the needle body 12 enclose each other to form a needle body portion 212. A groove for accommodating a biological probe is formed in the middle of the needle body portion 212. After machining the needle tip 211, the end of the needle body 212 away from the connection point between the needle body 212 and the material strip 11 is ground and sharpened to form the needle tip 211. After forming the needle tip 211 and the needle body 212, the needle 21 is obtained. After grinding, the needle tip 211 is sharp, making it easy to pierce the skin. Furthermore, a pre-cut section 13 is formed by stamping. The pre-cut section 13 is a thin and easily broken connection point, ensuring the connection between the needle body 12 and the material strip 11 during machining. This allows multiple needle body pieces 12 and multiple material strip pieces 11 to be stamped from a long material plate 1 during machining, with the multiple material strip pieces 11 forming a material strip (e.g., ...). Figure 5 and Figure 6 As shown, the strip has multiple needle pieces 12 connected by a connecting pre-break section 13. This ensures that the needle 21 does not shift during injection molding, guaranteeing its alignment and improving injection accuracy. It also eliminates the need for repeated positioning, increasing production efficiency. Furthermore, after injection molding, only a slight external force needs to be applied to the connecting pre-break section 13, such as bending, punching, or pulling with a robotic arm, to break the guide needle 2 at the connecting pre-break section, thus separating the guide needle 2 from the strip piece 11. This ensures the fixed connection needle 21 remains stationary during processing, and allows for easy separation of the guide needle 2 after processing.

[0033] For more details, please refer to Figure 12 , Figure 12 This is a schematic diagram of the back structure of the needle part 21. When the needle body plate 12 is ground and sharpened to form the needle tip 211, a bevel 214 can be ground on the back of the needle tip 211. This reduces the contact area between the needle tip 211 and the skin, making it easier to insert into the skin, reducing puncture resistance, and the bevel 214 on the back can prevent slippage during puncture, thus reducing pain and improving user comfort.

[0034] Please see Figure 4 and Figure 11 The process of stamping the material plate 1 to form the needle body sheet 12 and the material strip sheet 11 also includes the following steps: Multiple protrusions 215 and multiple grooves 216 are formed by stamping the two sides of the needle body piece 12 connecting the material strip piece 11; Multiple protrusions 215 are arranged along the length of the needle body piece 12, and multiple grooves 216 are arranged along the length of the needle body piece 12. The protrusions 215 and grooves 216 are positioned opposite to the first adhesive head 221. The multiple grooves 216 and multiple protrusions 215 are used to bend the two sides of the needle body piece 12 in the width direction to form a bent portion 213, which then cooperates with the first adhesive head 221 to seal the needle body portion 212.

[0035] Specifically, while stamping the needle body 12, multiple protrusions 215 are stamped on one side of the connection between the needle body 12 and the strip 11, and through holes are stamped on the bottom of the needle body 12. After polishing, the needle body 12 is bent on both sides in the width direction to form a bent portion 213. After bending, the through holes at the bottom of the needle body 12 form grooves 216 on both sides of the bent portion 213. The multiple protrusions 215 and the multiple grooves 216 extend along the length direction of the needle body 12. The protrusions 215 and the grooves 216 are located on the end of the bent portion 213 away from the needle tip 211, exhibiting a certain degree of curvature and not being straight. The flow of gas in the protrusions 215 and the grooves 216 will be hindered, which can prevent gas from entering to a certain extent. At the same time, through the above design, the first adhesive head 221 can fit more closely, forming a tight fit, which can further hinder the flow of gas and improve air tightness.

[0036] Please see Figure 4 and Figure 11 The process of bending both sides of the needle body piece 12 in the width direction to form a bent portion 213, and having the two bent portions 213 and the bottom of the needle body piece 12 enclose to form the needle body portion 212, further includes the following steps: The two bent portions 213 are machined on the side near the needle tip 211 to form a guide bevel 217, the thickness of which gradually increases from the needle tip 211 to the needle body 212. Specifically, the guide bevel 217 can be ground simultaneously with the needle tip 211. Other machining methods can also be used.

[0037] The guide bevel 217 reduces resistance during puncture, lowers frictional resistance when the guide needle 2 pierces the skin, and reduces user pain. Furthermore, the guide bevel 217 has a certain angle; during puncture, due to the different frictional forces between the guide bevel 217 and the skin, the needle tip 211 will slightly deflect in the opposite direction to the guide bevel 217. The direction of the needle tip 211 can be controlled by changing the direction of the guide bevel 217, thus adjusting the puncture direction.

[0038] Please see Figure 12An arc surface 218 is formed at the connection between the bottom of the needle body 12 and the bending portion 213. Specifically, the arc surface 218 can be formed simultaneously with the bending portions 213 on both sides of the bent needle body 12 along its length by chamfering. The arc surface 218 can also be formed by stamping, CNC lathe machining, or cold rolling. After forming the arc surface 218, it can be polished to reduce burrs formed during machining.

[0039] The bottom of the needle body 12 and the connection between the bent part 213 form an arc surface 218. The smooth arc surface 218 can reduce the resistance of puncture, further reduce the user's pain, and improve comfort.

[0040] Please see Figure 4 and Figure 7 The process of stamping the material plate 1 to form the needle part 21 and the material strip 11 also includes the following steps: The material plate 1 is stamped to form a strip 11 and a connecting part 14. The connecting part 14 includes a first connecting part 141 and a second connecting part 142. The two ends of the first connecting part 141 are respectively connected to the strip 11, one end of the second connecting part 142 is connected to the first connecting part 141, and the other end of the second connecting part 142 is connected to the strip 11.

[0041] Specifically, the connecting portion 14 is formed by stamping. The first connecting portion 141 and the second connecting portion 142 are perpendicular to each other. The first connecting portion 141 is perpendicular to the needle body piece 12. The connecting portion 14 is connected to the strip 11, which can enhance the strength of the strip 11 and prevent the strip 11 from breaking during processing. When it is necessary to produce a guide needle 2 with a longer needle part 21, the connecting portion 14 can be removed during the stamping process. This allows the strength of the strip 11 to be improved under normal production conditions through the connecting portion 14. In special cases where it is necessary to produce a guide needle 2 with a longer length, the connecting portion 14 is not formed during the stamping process to meet the production requirements of the guide needle 2. This makes the secondary injection molding manufacturing process of the strip-type CGM guide needle assembly of the present invention more compatible and able to meet more production needs.

[0042] Please see Figure 9 and Figure 10 The process of stamping the material plate 1 to form the needle part 21 and the material strip 11 also includes the following steps: stamping the material plate 1 to form the protective foot 15, wherein the protective foot 15 is used to protect the needle part 21; the protective foot 15 includes a first protective connecting part 151 and a second protective connecting part 152, the two ends of the first protective connecting part 151 are respectively connected to one end of the material strip 11 and the second protective connecting part 152, the second protective connecting part 152 is arranged parallel to the material strip 11, and a plurality of protective feet 15 are arranged around the needle part 21.

[0043] Multiple protective feet 15 are provided around the needle part 21. The first protective connecting part 151 is connected to the material strip 11 and the second protective connecting part 152. The second protective connecting part 152 is arranged parallel to the material strip 11. The protective feet 15 support to form a protective space. When the material is placed, it can protect the guide needle 2 and avoid collision with other objects or platforms and damage.

[0044] Please see Figure 9 and Figure 10 , Figure 9 This is a schematic diagram of the front structure of strip 11. Figure 10 This is a schematic diagram of the back structure of the material strip 11. Specifically, the protective foot 15 includes a first protective foot 153, a second protective foot 154, a third protective foot 155, and a fourth protective foot 156. The first protective foot 153 and the second protective foot 154 are located on the side of the needle tip 211 away from the needle body 212, and the third protective foot 155 and the fourth protective foot 156 are located on both sides of the needle body 212. The first protective foot 153 and the third protective foot 155 are arranged opposite to each other, and the second protective foot 154 and the fourth protective foot 156 are arranged opposite to each other. The first protective foot 153 and the fourth protective foot 156 protrude on the material strip 11 in a first direction, and the second protective foot 154 and the third protective foot 155 protrude on the material strip 11 in a second direction. The first direction and the second direction are opposite.

[0045] More specifically, the third protective foot 155 and the fourth protective foot 156 are located on both sides of the needle body portion 212, which can reduce the width of the material strip 11, reduce material consumption, and not hinder the injection molding process. In this embodiment, the first protective foot 153, the second protective foot 154, the third protective foot 155, and the fourth protective foot 156 all include a first protective connecting portion 151 and a second protective connecting portion 152. The first protective connecting portion 151 of the first protective foot 153 extends along a first direction, and the second protective connecting portion 152 of the first protective foot 153 is parallel to the material strip 11; the first protective connecting portion 151 of the fourth protective foot 156 extends along the first direction, and the second protective connecting portion 152 of the fourth protective foot 156 is parallel to the material strip 11. The second protective connecting portions 152 of the first protective foot 153 and the second protective connecting portions 152 of the fourth protective foot 156 are perpendicular to each other in the same plane. The first protective connecting portion 151 of the second protective foot 154 extends along the second direction, and the second protective connecting portion 152 of the second protective foot 154 is parallel to the material strip 11; the first protective connecting portion 151 of the third protective foot 155 extends along the second direction, and the second protective connecting portion 152 of the third protective foot 155 is parallel to the material strip 11. The second protective connecting portions 152 of the second protective foot 154 and the second protective connecting portions 152 of the third protective foot 155 are perpendicular to each other in the same plane. The first direction and the second direction are opposite and parallel to the material strip 11. By providing protective feet 15 in the first direction and the second direction, the guide pin 2 can have protective feet 15 in both the first direction and the second direction, forming a protective space, which can effectively prevent the guide pin 2 from being damaged due to improper placement. The second protective connecting portions 152 of the protective feet 15 in the same direction are perpendicular to each other in the same plane, which can make the material strip 11 more stable when placed.

[0046] The protective foot 15 includes a first protective foot 153, a second protective foot 154, a third protective foot 155, and a fourth protective foot 156. The first protective foot 153 and the fourth protective foot 156 protrude in a first direction, while the second protective foot 154 and the third protective foot 155 protrude in a second direction. The first and second directions are opposite, and the protective feet 15 protrude in two different directions, thus forming a protective space around the guide pin 2. The guide pin 2 is located in the middle of the protective space, which can effectively prevent other objects from entering the protective space and colliding with the guide pin 2, thereby preventing damage to the guide pin 2.

[0047] Please see Figures 3 to 6 In this embodiment, the first injection molding of the needle body 212 to form a first adhesive head 221 at the end of the needle body 212 away from the needle tip 211, and the second injection molding of the needle body 212 to form a second adhesive head 222 at the end of the needle body 212 away from the needle tip 211, further includes the following steps: The first plastic head 221 is formed by injection molding the end of the needle body 212 away from the needle tip 211 using the first mold; The second mold is used to injection mold the end of the needle body 212 away from the needle tip 211 to form a second plastic head 222; the second plastic head 222 wraps around the side of the first plastic head 221 near the needle tip 211.

[0048] in Figure 5 This diagram illustrates the process of forming the first injection head 221 during the first injection molding. Figure 6 In order to be in Figure 5 The diagram illustrates the second injection molding process to form the second rubber head 222. Injection molding is performed using two separate molds, the first and second, eliminating the need for complex molds and reducing mold and equipment costs. Separate maintenance is possible; even if one mold fails, only the damaged mold needs replacement, reducing overall maintenance costs. Furthermore, performing injection molding with two separate molds allows sufficient time for the first injection to cool and solidify, ensuring the first rubber head 221 does not deform during the second injection, thus guaranteeing a high yield rate for the guide pin 2.

[0049] In this embodiment, after the first glue head 221 is formed, an assembly groove 2211 and a positioning groove 2212 are formed on the side near the needle body 212. The assembly groove 2211 and the positioning groove 2212 facilitate the positioning of the subsequent second injection molding and can also fix the second glue head 222 to prevent the second glue head 222 from rotating and shifting, which would lead to a decrease in air tightness.

[0050] In another embodiment, performing a first injection molding on the needle body portion 212 to form a first adhesive head 221 at the end of the needle body portion 212 away from the needle tip portion 211, and performing a second injection molding on the needle body portion 212 to form a second adhesive head 222 at the end of the needle body portion 212 away from the needle tip portion 211, further includes the following steps: The first injection assembly of the double-shot mold performs a first injection molding process on the end of the needle body 212 in the mold core that is away from the needle tip 211 to form the first glue head 221; Rotate or move the mold core and use the second injection assembly of the double injection mold to perform a second injection on the side of the needle body 212 away from the needle tip 211 after the first injection to form a second glue head 222; the second glue head 222 wraps around the side of the first glue head 221 near the needle tip 211.

[0051] Using a dual-shot mold for secondary injection molding saves time transferring the material strip 11, improving production efficiency. Furthermore, when the first injection head 221 is formed and the second injection head 222 is formed, the first injection head 221 has not yet fully cooled, resulting in a tighter connection and better airtightness between the two heads. It also allows for precise positioning of the two injection points, leading to higher product accuracy for the guide pin 2.

[0052] Combination Figures 1 to 12 The specific operation process of the secondary injection molding manufacturing process of the strip-type CGM guide pin assembly of the present invention is as follows: A material plate 1 is fed onto a stamping press. The stamping press forms multiple strip pieces 11, pin body pieces 12, protective feet 15, connecting parts 14, protrusions 215, grooves 216, and a connecting material pre-cutting part 13, forming a strip with multiple pin body pieces 12 on it. After forming, the strip is sent to a polishing machine to polish and deburr the pin body pieces 12, and then bent to form the pin body part 212. The arc surface 218 at the bottom connection of part 213 and needle body piece 12 is simultaneously ground and sharpened to form the needle tip 211, the bevel 214, and the guide bevel 217. After the needle part 21 is formed, the material strip piece 11 is sent to the injection molding machine. The first mold and the second mold are used to injection mold the first plastic head 221 and the second plastic head 222 respectively. After cooling, external force is applied to the connecting material pre-break part 13 to separate the injection molded needle part 21 from the material strip piece 11 to obtain the guide needle 2.

[0053] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A secondary injection molding manufacturing process for a strip-type CGM guide pin assembly, characterized in that, Includes the following steps: The material plate (1) is stamped to form a needle part (21) and a material strip (11); wherein, the needle part (21) includes a needle tip part (211) and a needle body part (212), the needle tip part (211) is connected to one end of the needle body part (212), and the other end of the needle body part (212) is connected to the material strip (11); The needle body (212) is first injection molded at the end near the material strip (11), and a first glue head (221) is formed at the end of the needle body (212) away from the needle tip (211). A second injection molding is performed on the end of the needle body (212) near the material strip (11), and a second rubber head (222) is formed at the end of the needle body (212) away from the needle tip (211). The second rubber head (222) wraps around the side of the first rubber head (221) near the needle tip (211), and the hardness of the first rubber head (221) is greater than that of the second rubber head (222). The needle body (212) after secondary injection molding is separated from the material strip (11) to obtain the guide needle (2).

2. The secondary injection molding manufacturing process for the strip-type CGM guide pin assembly according to claim 1, characterized in that, The process of stamping the material plate (1) to form the needle part (21) and the strip (11) also includes the following steps: The material plate (1) is stamped to form a needle body sheet (12) and a strip sheet (11). Polish the needle body (12) to remove burrs from the needle body (12); The two sides of the bent needle body sheet (12) in the width direction form a bent portion (213), and the two bent portions (213) and the bottom of the needle body sheet (12) enclose to form a needle body part (212); the needle body part (212) is used to accommodate the biological probe from the outside. One end of the needle body piece (12) is ground to form a needle tip (211); A pre-cut section (13) is formed by stamping at one end of the needle body (212) away from the needle tip (211). The pre-cut section (13) is used to separate the needle body (212) from the material strip (11) after the second injection molding is completed.

3. The secondary injection molding manufacturing process for the strip-type CGM guide pin assembly according to claim 2, characterized in that, The process of stamping the material plate (1) to form the needle body sheet (12) and the strip sheet (11) also includes the following steps: Multiple protrusions (215) and multiple grooves (216) are formed by stamping the two sides of the needle body piece (12) connecting the strip piece (11). Multiple protrusions (215) are arranged along the length of the needle body piece (12), and multiple grooves (216) are arranged along the length of the needle body piece (12). The protrusions (215) and grooves (216) are opposite to the positions of the first adhesive head (221) and (22). The multiple grooves (216) and multiple protrusions (215) are used to bend the two sides of the needle body piece (12) in the width direction to form a bent part (213) and then cooperate with the first adhesive head (221) to seal the needle body part (212).

4. The secondary injection molding manufacturing process for the strip-type CGM guide pin assembly according to claim 2, characterized in that, The process of bending both sides of the needle body piece (12) in the width direction to form a bent portion (213), and the two bent portions (213) and the bottom of the needle body piece (12) enclosing each other to form a needle body portion (212) also includes the following steps: The two bent portions (213) are processed on the side near the needle tip (211) to form a guide slope (217), and the thickness of the guide slope (217) gradually increases from the needle tip (211) to the needle body (212).

5. The secondary injection molding manufacturing process for the strip-type CGM guide pin assembly according to claim 2, characterized in that, The bottom of the needle body (12) and the connection between the bent part (213) form an arc surface (218).

6. The secondary injection molding manufacturing process for the strip-type CGM guide pin assembly according to claim 1, characterized in that, The process of stamping the material plate (1) to form the needle part (21) and the strip (11) also includes the following steps: The material plate (1) is stamped to form a strip (11) and a connecting part (14); the connecting part (14) includes a first connecting part (141) and a second connecting part (142). The two ends of the first connecting part (141) are connected to the strip (11) respectively, one end of the second connecting part (142) is connected to the first connecting part (141), and the other end of the second connecting part (142) is connected to the strip (11).

7. The secondary injection molding manufacturing process for the strip-type CGM guide pin assembly according to claim 1, characterized in that, The process of stamping the material plate (1) to form the needle part (21) and the strip (11) also includes the following steps: The material plate (1) is stamped to form protective feet (15); wherein, the protective feet (15) are used to protect the needle part (21); the protective feet (15) include a first protective connecting part (151) and a second protective connecting part (152), the two ends of the first protective connecting part (151) are respectively connected to one end of the material strip (11) and the second protective connecting part (152), the second protective connecting part (152) is arranged parallel to the material strip (11), and multiple protective feet (15) are arranged around the needle part (21).

8. The secondary injection molding manufacturing process for the strip-type CGM guide pin assembly according to claim 7, characterized in that, The protective foot (15) includes a first protective foot (153), a second protective foot (154), a third protective foot (155), and a fourth protective foot (156). The first protective foot (153) and the second protective foot (154) are located on the side of the needle tip (211) away from the needle body (212). The third protective foot (155) and the fourth protective foot (156) are located on both sides of the needle body (212). The first protective foot (153) and the third protective foot (155) are arranged opposite to each other. The second protective foot (154) and the fourth protective foot (156) are arranged opposite to each other. The first protective foot (153) and the fourth protective foot (156) protrude on the material strip (11) in a first direction. The second protective foot (154) and the third protective foot (155) protrude on the material strip (11) in a second direction. The first direction and the second direction are opposite.

9. The secondary injection molding manufacturing process for the strip-type CGM guide pin assembly according to claim 1, characterized in that, The process of performing a first injection molding on the needle body (212) to form a first plastic head (221) at the end of the needle body (212) away from the needle tip (211) and performing a second injection molding on the needle body (212) to form a second plastic head (222) at the end of the needle body (212) away from the needle tip (211) further includes the following steps: The first plastic head (221) is formed by injection molding the end of the needle body (212) away from the needle tip (211) using the first mold. The second plastic head (222) is formed by injection molding the end of the needle body (212) away from the needle tip (211) through the second mold; the second plastic head (222) wraps around the side of the first plastic head (221) near the needle tip (211).

10. The secondary injection molding manufacturing process for the strip-type CGM guide pin assembly according to claim 1, characterized in that, The process of performing a first injection molding on the needle body (212) to form a first plastic head (221) at the end of the needle body (212) away from the needle tip (211) and performing a second injection molding on the needle body (212) to form a second plastic head (222) at the end of the needle body (212) away from the needle tip (211) further includes the following steps: The first injection assembly of the double injection mold is used to perform the first injection molding on the end of the needle part (212) in the mold core that is away from the needle tip (211) to form the first glue head (221). Rotate or move the mold core and use the second injection assembly of the double injection mold to perform a second injection on the side of the needle body (212) away from the needle tip (211) after the first injection to form a second rubber head (222); the second rubber head (222) wraps around the side of the first rubber head (221) near the needle tip (211).

Images