Stamping die for producing CGM guide needle

Abstract

The utility model relates to the technical field of continuous glucose monitors, in particular to a stamping die for producing a CGM guide needle, which comprises a lower forming die and an upper forming die movably arranged relative to the lower forming die, the upper forming die is provided with a main punch, the lower forming die is provided with a first female die matched with the main punch for use, and the first female die is provided with a second female die matched with the main punch for use. An external metal material strip is located between the first female die and the main punch, and the main punch is used for punching the metal material strip on the first female die to form a needle head body with a needle tip part on the main punch; the first bending die and the second bending die are arranged close to each other or away from each other, the moving direction of the first bending die and the moving direction of the second bending die are perpendicular to or parallel to the moving direction of the upper forming die, and the first bending die and the second bending die are used for abutting against the two sides of the needle head body in the length direction to reciprocate. The two sides of the needle head body in the width direction are bent to form a needle groove used for containing a sensing electrode of an external glucose sensor.

Description

Technical Field

[0001] This utility model relates to the field of continuous glucose monitor technology, and in particular discloses a stamping die for producing CGM guide needles. Background Technology

[0002] Existing manufacturing processes for CGM (Continuous Glucose Monitoring) guide needles typically involve multiple steps and complex mold structures, resulting in low production efficiency and high costs. Particularly in areas such as needle body forming, tip sharpening, chamfering, needle groove formation, and the mounting structure for integration with the delivery device, traditional processes often require multiple stamping and bending operations, making it difficult to guarantee dimensional accuracy and consistency. Furthermore, existing mold structures are prone to needle body deformation during needle groove formation, affecting subsequent puncture performance and patient comfort. Therefore, there is an urgent need for a new type of stamping mold that can simplify the production process, improve production efficiency, and simultaneously ensure product quality. Utility Model Content

[0003] In order to overcome the shortcomings and deficiencies of the existing technology, the purpose of this utility model is to provide a stamping die for producing CGM guide pins.

[0004] To achieve the above objectives, this utility model provides a stamping die for producing CGM guide pins, comprising a lower forming die and an upper forming die movably disposed relative to the lower forming die. The upper forming die is provided with a main punch, and the lower forming die is provided with a first die that cooperates with the main punch. An external metal strip is located between the first die and the main punch. The main punch is used to punch the metal strip on the first die to form a needle body with a needle tip.

[0005] It also includes a first bending die and a second bending die that are positioned relatively close to or far from each other. The moving directions of the first bending die and the second bending die are perpendicular or parallel to the moving direction of the upper forming die. The first bending die and the second bending die are used to reciprocate against the two sides of the needle body in the width direction, so that the two sides in the length direction approach each other to form a needle groove for accommodating the sensing electrode of the external glucose sensor.

[0006] Furthermore, the main punch includes a V-shaped punch, and the first die cavity is provided with a wedge-shaped groove for accommodating the V-shaped punch. External metal strip is punched at one end of the needle body to form a needle tip by the cooperation of the V-shaped punch and the wedge-shaped groove.

[0007] Furthermore, the main punch also includes a chamfering punch. The first die cavity is provided with a chamfering groove for accommodating the chamfering punch. The chamfering punch is used to cut the metal strip on the chamfering groove to form a chamfer at the connection between the needle body and the needle tip.

[0008] Furthermore, the V-shaped punch has a V-shaped cutting edge with an angle of 24-44 degrees.

[0009] Furthermore, the V-shaped cutting edge has an angle of 36 degrees, and the included angle between the extended lines of the inclined edges of the two chamfered portions formed on the needle body by the chamfering punch is also 36 degrees.

[0010] Furthermore, the chamfered groove and the wedge-shaped groove are interconnected.

[0011] Furthermore, the wedge-shaped groove has an included angle between its sidewall and bottom wall that is greater than 90° and less than 150°.

[0012] Furthermore, the upper forming die is also provided with two crease punches, which are symmetrically arranged along the axis of symmetry of the V-shaped punch. The two crease punches are movably arranged relative to the main punch to form pre-creases on both sides of the needle body. The pre-creases are used to cooperate with the first bending die and the second bending die.

[0013] Furthermore, the main punch also includes at least two side punches, which are symmetrically arranged along the axis of symmetry of the main punch. Each of the two side punches has a side forming groove on the side closest to each other. The first die cavity is provided with a side blanking groove corresponding to the side punches. The side forming groove is used to punch a limiting protrusion at the end of the needle body away from the needle head. The limiting protrusion is used to cooperate with the guide needle launching device of the external glucose monitor.

[0014] Furthermore, the number of side forming grooves on each side punch is at least two.

[0015] Furthermore, a pre-cutting punch is movably provided on the main punch. One end of the metal strip is punched by the pre-cutting punch to form a pre-cutting mark that does not penetrate the metal strip. After the first bending die and the second bending die fold the two sides of the needle body to form a needle groove, the pre-cutting punch cuts along the pre-cutting mark, so that the needle body is separated from the metal strip to form a guide needle.

[0016] Furthermore, the side punch is also provided with a beveled guide punch protruding from its side. The beveled guide punch is used to punch and form an installation groove at the end of the needle body away from the needle tip. The installation groove separates the end of the needle body away from the needle tip to form an installation head. The installation head is installed in conjunction with the guide needle launching device of the external glucose monitor.

[0017] Furthermore, the inclined guide punch has a triangular-like structure, with a rounded transition between the right-angled side and the inclined side; the angle between the inclined side of the inclined guide punch and the length direction of the side punch is 25-35°.

[0018] The core of this invention lies in achieving rapid and precise forming of CGM guide needles through an integrated stamping die. The die includes an upper forming die and a lower forming die. The main punch cooperates with the first die cavity to form the needle body with a needle tip in a single punching operation. A V-shaped punch and a wedge-shaped groove cooperate to sharpen the needle tip. A chamfering punch and a chamfering groove cooperate to form a chamfer at the connection between the needle tip and the needle body, reducing puncture resistance.

[0019] Simultaneously, the first and second bending dies reciprocate to bring the two sides of the needle body closer together, forming a needle groove to accommodate the sensor electrode. Furthermore, through the cooperation of the side punch, side forming groove, and beveled guide punch, limiting protrusions and mounting grooves are formed on the needle body, enabling rapid installation with the transmitting device. Finally, the pre-cutting punch separates the formed guide needle from the metal strip. The entire process, through a clever mold structure and stamping sequence, achieves the integral forming of the guide needle.

[0020] The beneficial effects of this utility model are as follows: This utility model patent achieves one-time molding of the CGM guide needle through an integrated stamping die design, greatly simplifying the production process, improving production efficiency, and reducing production costs. The combination of the V-shaped punch and wedge groove ensures the sharpness of the needle tip; the chamfered part effectively reduces puncture resistance, minimizes tissue damage, and improves patient comfort. The pre-crease design makes the bending process more precise and avoids deformation of the needle body.

[0021] The limiting protrusion formed by the side punch and the mounting groove formed by the beveled guide punch make the installation of the guide pin and the launching device more convenient and reliable. Furthermore, the pre-cut punch enables automatic separation of the guide pin, further improving production efficiency. Overall, this utility model patent provides an efficient, precise, and reliable CGM guide pin production solution with significant economic and social benefits. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the stamping die of this utility model;

[0023] Figure 2 This is a structural schematic diagram of the chamfering punch, V-shaped punch, and main punch of this utility model;

[0024] Figure 3 This is a schematic diagram of the side punch of this utility model;

[0025] Figure 4 This is a schematic diagram of the cross-sectional structure of the first bending die, the second bending die, and the needle body after the two sides are bent to form needle grooves according to the present invention.

[0026] Figure 5This is a schematic diagram of the structure of the wedge-shaped groove and the chamfered groove of this utility model;

[0027] Figure 6 This is a schematic diagram of the structure of the needle body of this utility model;

[0028] Figure 7 This is a schematic diagram of the structure of a guide pin made using the novel stamping die.

[0029] The reference numerals in the figures include:

[0030] 1. Lower forming die; 2. Upper forming die; 100. Upper die base; 200. Buffer pad; 300. Punch fixing plate; 400. Stripper plate; 500. Lower die base; 3. First bending die; 4. Second bending die; 6. Guide pin; 60. Pin groove; 61. Pin body; 62. Mounting head; 63. Mounting groove; 64. Limiting protrusion; 65. Pin tip; 66. Chamfered part; 11. First concave die; 111. Wedge groove; 112. Chamfered groove; 20. Main punch; 21. V-shaped punch; 211. V-shaped cutting edge; 22. Chamfered punch; 23. Side punch; 231. Side forming groove; 232. Beveled guide punch; 24. Pre-cut punch. Detailed Implementation

[0031] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention.

[0032] Please see Figures 1 to 7 As shown, the core workflow of this utility model for producing CGM guide pins is as follows: First, a pre-cutting mark is formed on the metal strip (0.1mm thick) using a pre-cutting punch 24 to prepare for subsequent separation; then, the needle tip 65 is sharpened using a V-shaped punch 21 and a wedge groove 111 to form a sharp needle tip 65; finally, the distal end of the needle tip 65 is chamfered using a chamfering punch 22 to facilitate subsequent bending operations and optimize puncture resistance. Yes; subsequently, the needle body 61 is formed by punching with the two side punches 23 of the main punch 20. At the same time, the oblique guide protrusions 232 and the side forming grooves 231 of the side punches 23 form limiting protrusions 64 and mounting grooves 63 on both sides of the needle body 61, facilitating installation with the guide needle 6 launching device of the glucose monitor; finally, the needle groove 60 is formed on the needle body 61 using the folding punch and the first bending die 3 and the second bending die 4 to ensure accurate accommodation of the sensor electrode. The entire process achieves one-time rapid forming of the guide needle 6 through the synergistic action of the various components of the mold, significantly improving production efficiency and product quality.

[0033] Specifically, the upper forming die 2 is installed to the hydraulic output end of the punch press via a rectangular upper die base 100. A stripper plate 400 is provided above the upper forming die 2, and a punch fixing plate 300 is provided above the stripper plate 400. The punch fixing plate 300 is installed to the upper die base 100 via a buffer pad 200. The lower forming die 1 is installed to the base of the punch press via a lower die base 500 made of the same material and shape as the upper die base 100.

[0034] Specifically, the pre-cutting punch 24 is located at the front end of the main punch 20 and is used to form a pre-cutting mark on the metal strip to prepare for subsequent separation, ensuring a smooth and precise separation process between the needle body 61 and the metal strip.

[0035] Specifically, the V-shaped punch 21 is located at the end of the main punch 20 away from the pre-cutting punch 24 and is V-shaped, closely fitting with the wedge groove 111. It is used to sharpen the needle tip 65. The angle between the side wall and the bottom wall of the wedge groove 111 in the first die 11 is 110° (the side wall extends upward from the bottom wall in a roughly trumpet shape). This structural design makes the sharpening of the needle tip more precise, avoiding the accuracy errors and low efficiency caused by multiple grinding processes in traditional processes.

[0036] Specifically, the V-shaped punch 21 has a V-shaped cutting edge 211 with an angle of 36 degrees, and the included angle between the extended lines of the inclined sides of the two chamfered portions 66 formed on the needle body 61 by the chamfering punch 22 is also 36 degrees.

[0037] Specifically, the chamfering punch 22 is located at the front end of the V-shaped punch 21 and is used to form a chamfer at the connection between the needle tip 65 and the needle body 61. The first die 11 is provided with a chamfering groove 112 that precisely matches the chamfering punch 22, with a chamfer width of 0.34 mm and a chamfer length of 0.98 mm.

[0038] The shape and size of the chamfering groove 112 are precisely matched with the chamfering punch 22, forming a cavity to accommodate the chamfering punch 22, ensuring that the chamfering punch 22 can accurately act on the metal strip during the stamping process. When the main punch 20 presses down, the chamfering punch 22 enters the chamfering groove 112 and cuts the metal strip located therein, thereby forming a smooth chamfer 66 at the connection between the needle body 61 and the needle tip 65. Through this precisely matched structure, a high-quality chamfer can be stamped in one step without additional processing steps.

[0039] Specifically, in this stamping die, the wedge-shaped groove 111, which cooperates with the V-shaped punch 21 for sharpening, forms an angle between its sidewall and bottom wall. This angle is not a right angle (90°), but is precisely controlled within a range greater than 90° and less than 150°. In this embodiment, this angle is preferably 110°. The bottom wall of the wedge-shaped groove 111 is a plane, while the sidewall is an inclined plane, and the two intersect to form an obtuse angle. When the V-shaped punch 21 is pressed down, its V-shaped cutting edge 211 cooperates with the sidewall and bottom wall of the wedge-shaped groove 111 to punch the metal strip, thereby forming a needle-tip cutting edge. The angle between the sidewall and bottom wall of the wedge-shaped groove 111 determines the sharpening angle and sharpness of the needle tip.

[0040] Setting the angle between the sidewall and bottom wall of the wedge groove 111 to greater than 90° and less than 150° effectively controls the cutting angle of the needle tip, achieving optimal puncture performance. If the angle is less than 90°, the needle tip will be too sharp, easily bending or breaking during puncture, and also easily causing significant tissue damage. If the angle is greater than 150°, the needle tip will be too blunt, increasing puncture resistance and making it difficult to smoothly enter the subcutaneous tissue. By controlling the angle within the range of greater than 90° and less than 150°, the needle tip can be ensured to have both sufficient sharpness and strength, thereby achieving efficient and safe puncture. The preferred 110° angle makes the cutting edge of the needle tip more reasonable, ensuring smooth puncture while reducing tissue damage and improving patient comfort. This angle design avoids the problem of difficult control of the needle tip cutting angle in traditional processes, ensuring the stability and consistency of product quality.

[0041] Specifically, in this stamping die, two folding punches are provided on the upper forming die 2 to achieve precise bending on both sides of the needle body 61. These two folding punches are not fixed to the main punch 20, but can move relative to the main punch 20. They are symmetrically arranged along the axis of symmetry of the V-shaped punch 21 to ensure the symmetry of the pre-folds. The shape of the folding punches is usually linear or narrow strip-shaped, and their stamping surface matches the surface of the needle body 61, which can stamp shallow grooves, i.e., pre-folds, on both sides of the needle body 61.

[0042] The movement of these two crease punches is coordinated with that of the main punch 20. During the downward pressing of the main punch 20, they contact the needle body 61 before the bending die, stamping pre-creases on both sides of the needle body 61. The depth and width of the pre-creases need to be precisely controlled to ensure the accuracy and consistency of subsequent bending. In a specific embodiment, the stamping surface of the crease punch is a narrow strip with a width of 0.03 mm, and the depth of the pre-crease is 0.01 mm. These pre-creases provide precise bending guidance and positioning for the subsequent first bending die 3 and second bending die 4.

[0043] Specifically, in this stamping die, to form a limiting protrusion 64 on the needle body 61 for cooperation with the glucose monitor transmitter, the main punch 20 integrates at least two side punches 23. These two side punches 23 are symmetrically arranged along the axis of symmetry of the main punch 20, ensuring the symmetry of the limiting protrusions 64 formed on both sides of the needle body 61. Each side punch 23 has a side forming groove 231 on its closest side, the shape of which corresponds to the shape of the limiting protrusion 64. In the first die cavity 11, a side blanking groove corresponding to the side punches 23 is provided to accommodate the punched metal scrap. The specific shape and size of the side forming groove 231 need to be adjusted according to the specific design of the limiting protrusion 64 to ensure that the limiting protrusion 64 can accurately cooperate with the transmitter.

[0044] Preferably, each side punch 23 has at least two side forming grooves 231. This means that each side punch 23 can punch at least two limiting protrusions 64 on the needle body 61. These limiting protrusions 64 can be distributed at different positions on the end of the needle body 61 away from the needle tip 65 to provide more stable installation and positioning. For example, two limiting protrusions 64 can be designed on both sides of the needle body 61, or four limiting protrusions 64 can be designed, two on each side, to form a more robust limiting. The shape of the side forming grooves 231 can be rectangular, semi-circular, trapezoidal, etc., designed according to actual needs.

[0045] Specifically, in this stamping die, a pre-cutting punch 24 is movably provided on the main punch 20 to achieve the separation of the guide pin 6 from the metal strip. This pre-cutting punch 24 is not fixed to the main punch 20, but can move within a limited range relative to the main punch 20 during its movement. The stamping surface of the pre-cutting punch 24 is typically linear or narrow strip-shaped. Its function is to stamp the metal strip, but not to directly cut it; instead, it forms a pre-cutting mark on the metal strip that is not completely penetrated. The depth and width of this pre-cutting mark need to be precisely controlled to ensure smooth subsequent separation.

[0046] During the downward pressing of the main punch 20, the pre-cutting punch 24 acts on the metal strip before other stamping components, forming a pre-cut mark. Subsequently, the V-shaped punch 21, chamfering punch 22, folding punch, side punch 23, and other components sequentially stamp the metal strip, forming structures such as needle tips, chamfers, pre-fold marks, and limiting protrusions 64. After the first bending die 3 and the second bending die 4 fold the two sides of the needle body 61 to form the needle groove 60, the pre-cutting punch 24 presses down again, cutting the metal strip along the previously formed pre-cut mark, ultimately separating the complete guide needle 6 from the metal strip. The mobility of the pre-cutting punch 24 ensures that it can form the pre-cut mark and perform the final separation at the appropriate time and position.

[0047] Specifically, in this stamping die, in order to form a mounting head 62 for cooperating with the glucose monitor transmitter at the end of the needle body 61 away from the needle tip 65, a beveled guide punch 232 protruding from its side is further provided on the side punch 23. This beveled guide punch 232 is not parallel to the cutting surface of the side punch 23, but protrudes at a certain angle. Its function is to punch a mounting groove 63 on the needle body 61, which separates the end of the needle body 61 away from the needle tip 65 to form a mounting head 62.

[0048] The shape and size of the beveled guide punch 232 need to be adjusted according to the specific design of the mounting head 62 to ensure that the mounting head 62 can accurately mate with the launching device. For example, the beveled guide punch 232 can be designed as a V-shape or a U-shape, thereby punching out corresponding V-shaped or U-shaped mounting grooves 63 on the needle body 61 to form two or more mounting heads 62. When the side punch 23 is pressed down, the beveled guide punch 232 will simultaneously punch the metal strip to form the mounting grooves 63 and divide one end of the needle body 61 into mounting heads 62.

[0049] In this stamping die, to optimize the punching effect of the mounting groove 63 and the shape of the mounting head 62, the inclined guide punch 232 is designed as a triangular-like structure. This triangular-like structure is not a triangle in the strict sense, but rather has a rounded transition between its right-angled side and the inclined side. This rounded transition can effectively reduce stress concentration during the punching process and prevent the sharp edges of the punch from causing excessive damage to the metal strip.

[0050] Furthermore, there is an angle between the inclined edge of the beveled guide punch 232 and the length direction of the side punch 23, and this angle is precisely controlled within the range of 25-35°. This angle design determines the shape of the mounting groove 63 and the tilt angle of the mounting head 62, thus affecting the fit between the guide pin 6 and the launching device. Preferably, in this embodiment, the angle is 30°, resulting in a corresponding tilt angle for the mounting groove 63 and mounting head 62, which better matches the structure of the launching device. This inclined edge also facilitates the removal of the sensing electrode from the skin by the launching device after the guide pin 6 has been implanted into the skin.

[0051] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A stamping die for producing CGM guide pins, comprising a lower forming die (1) and an upper forming die (2) movably disposed relative to the lower forming die (1), characterized in that: The upper forming die (2) is provided with a main punch (20), and the lower forming die (1) is provided with a first die (11) that works in conjunction with the main punch (20). An external metal strip is located between the first die (11) and the main punch (20). The main punch (20) is used to punch the metal strip on the first die (11) to form a needle body (61) with a needle tip (65). It also includes a first bending die (3) and a second bending die (4) that are relatively movable. The moving directions of the first bending die (3) and the second bending die (4) are perpendicular or parallel to the moving direction of the upper forming die (2). The first bending die (3) and the second bending die (4) are used to reciprocate against the two sides of the needle body (61) in the length direction, so that the two sides of the needle body (61) in the length direction approach each other to form a needle groove (60) for accommodating the sensing electrode of the external glucose sensor.

2. The stamping die for producing CGM guide pins according to claim 1, characterized in that: The main punch (20) includes a V-shaped punch (21). The first die (11) is provided with a wedge-shaped groove (111) that corresponds to and cooperates with the V-shaped punch (21). The external metal strip is punched and cut at one end of the needle body (61) to form a needle tip (65) through the cooperation of the V-shaped punch (21) and the wedge-shaped groove (111).

3. The stamping die for producing CGM guide pins according to claim 1, characterized in that: The main punch (20) also includes a chamfering punch (22). The first die (11) is provided with a chamfering groove (112) that works with the chamfering punch (22). The chamfering punch (22) is used to punch the metal strip on the chamfering groove (112) to form a chamfer (66) at the connection between the needle body (61) and the needle tip (65).

4. The stamping die for producing CGM guide pins according to claim 2, characterized in that: The wedge-shaped groove (111) has an angle between its sidewall and bottom wall greater than 90° and less than 150°.

5. The stamping die for producing CGM guide pins according to claim 2, characterized in that: The upper forming die (2) is also provided with two crease punches. The two crease punches are symmetrically arranged along the axis of symmetry of the V-shaped punch (21). The two crease punches are movably arranged relative to the main punch (20) to form pre-creases on both sides of the needle body (61). The pre-creases are used in conjunction with the first bending die (3) and the second bending die (4).

6. The stamping die for producing CGM guide pins according to claim 1, characterized in that: The main punch (20) also includes two side punches (23), which are symmetrically arranged along the axis of symmetry of the main punch (20). The two side punches (23) are provided with side forming grooves (231) on the side that is close to each other. The first die (11) is provided with a side blanking groove corresponding to the side punches (23). The side forming grooves (231) are used to punch and form a limiting protrusion (64) at the end of the needle body (61) away from the needle head. The limiting protrusion (64) is used to cooperate with the guide needle (6) launching device of the external glucose monitor.

7. The stamping die for producing CGM guide pins according to claim 6, characterized in that: The number of side forming grooves (231) on each side punch is at least two.

8. The stamping die for producing CGM guide pins according to claim 6, characterized in that: The side punch (23) is also provided with a beveled guide punch (232) protruding from its side. The beveled guide punch (232) is used to punch a mounting groove (63) at the end of the needle body (61) away from the needle tip (65). The mounting groove (63) separates the end of the needle body (61) away from the needle tip (65) to form a mounting head (62). The mounting head (62) is installed in conjunction with the guide needle (6) transmitter of the external glucose monitor.

9. The stamping die for producing CGM guide pins according to claim 8, characterized in that: The inclined guide punch (232) has a triangular structure, and a rounded transition is provided between the right-angled side and the inclined side of the inclined guide punch (232); the angle between the inclined side of the inclined guide punch (232) and the length direction of the side punch (23) is 25-35°.

10. The stamping die for producing CGM guide pins according to claim 1, characterized in that: A pre-cutting punch (24) is movably provided on the main punch (20). One end of the metal strip is punched by the pre-cutting punch (24) to form a pre-cutting mark that does not penetrate the metal strip. After the first bending die (3) and the second bending die (4) fold the two sides of the needle body (61) to form a needle groove (60), the pre-cutting punch (24) cuts along the pre-cutting mark, so that the needle body (61) is separated from the metal strip to form a guide needle (6).

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