High-positioning-precision plastic embedding forming mold for thin-walled tubular cutter for minimally invasive surgery

Abstract

The utility model discloses a minimally invasive surgery thin-walled tubular cutter plastic embedding forming die with high positioning precision, which comprises an upper die plate, a lower die plate, an upper cavity seat, a lower cavity seat, an upper positioning column, a lower positioning column, an axial positioning needle and a positioning needle mounting piece, and the upper positioning column comprises a first upper positioning column and a second upper positioning column; the lower positioning columns comprise the first lower positioning column and the second lower positioning column, the first upper positioning column is installed in the vertical through hole of the upper cavity base, the first lower positioning column is installed in the vertical through hole of the lower cavity base and located under the first upper positioning column, and the second upper positioning column is installed in the vertical through hole of the upper die plate and located under the second upper positioning column. The second lower positioning column is installed in the vertical through hole of the lower die plate and located under the second upper positioning column. According to the utility model, the two radial positioning points are used for radially positioning the metal cutter body in the axial direction of the metal cutter body, so that the radial positioning of the metal cutter body is firmer and more reliable, and the plastic embedding forming quality is improved.

Description

Technical Field

[0001] This utility model relates to a molding die for embedding tubular cutting tools, and more particularly to a molding die for embedding thin-walled tubular cutting tools for minimally invasive surgery with high positioning accuracy. Background Technology

[0002] like Figure 1 As shown, the minimally invasive surgical thin-walled tubular blade is assembled from a thin-walled, circular tubular metal blade body 3 and a plastic drive handle 1 through an embedded molding process. The molding process involves first placing the metal blade body 3 into the cavity of the embedded molding mold, positioning it using the mold, and then injecting molten plastic into the cavity to form a structurally stable blade. The blade body through-hole 4 of the metal blade body 3 and the drive handle through-hole 2 of the plastic drive handle 1 are interconnected. During surgical operations, the plastic drive handle 1 is generally connected to the minimally invasive surgical instrument, and the biological tissue debris cut by the blade tip of the metal blade body 3 is discharged through the blade body through-hole 4 and the drive handle through-hole 2.

[0003] Traditional molds for molding thin-walled tubular surgical instruments in minimally invasive surgery use an upper positioning post within an upper mold and a lower positioning post within a lower mold to radially position the metal blade body 3, and a lateral positioning post to axially position it before injection molding. This traditional positioning structure has the following drawbacks: because the metal blade body 3 is long and thin, radial positioning with only one upper and one lower positioning post is not secure. The metal blade body 3 is prone to movement during injection molding, leading to deviations in the overall length of the part and affecting the reliability of its function; the positioning pin insertion... The length of the through hole 4 in the metal cutter body 3 is relatively short, and there is a gap between the end of the positioning pin and the corresponding positions of the upper and lower positioning pins. This results in the positioning of the end of the metal cutter body 3 located in the plastic transmission handle 1 being inaccurate and unstable, making it difficult to ensure the coaxiality between the metal cutter body 3 and the plastic transmission handle 1, thus reducing the quality of the embedded molding. The lower end face of the upper positioning pin and the upper end face of the lower positioning pin are both semi-circular grooves. This structure requires high machining accuracy for the semi-circular grooves. If there is a slight error, it will cause a large risk of crushing to the metal cutter body 3, resulting in a decrease in the product qualification rate. Utility Model Content

[0004] The purpose of this invention is to provide a high-precision positioning mold for embedding and molding thin-walled tubular cutting tools for minimally invasive surgery in order to solve the above problems.

[0005] This utility model achieves the above objectives through the following technical solutions:

[0006] A high-precision positioning mold for embedding a thin-walled tubular cutting tool in minimally invasive surgery includes an upper template, a lower template, an upper cavity seat, a lower cavity seat, an upper positioning post, a lower positioning post, an axial positioning pin, and a positioning pin mounting component. The upper template is mounted above the lower template, the upper cavity seat is mounted inside the upper template, and the lower cavity seat is mounted inside the lower template. The axial positioning pin has a reduced outer diameter section near its first end, forming a small-diameter section. The second end of the axial positioning pin is mounted on the positioning pin mounting component. The positioning pin mounting component is mounted inside the upper and lower templates and located near its first end. An injection cavity is formed between the lower surface of the upper cavity seat and the upper surface of the lower cavity seat, and the small-diameter section of the positioning pin is located within this injection cavity. The upper positioning post includes a first upper positioning post and a second upper positioning post. The lower positioning post includes a first lower positioning post and a second lower positioning post. The upper cavity seat has a vertical through hole at a position away from the second end of the axial positioning pin, and the first upper positioning post is installed in the vertical through hole. The lower cavity seat has a vertical through hole at a position directly below the first upper positioning post, and the first lower positioning post is installed in the vertical through hole. The upper template has a vertical through hole at a position near the second end of its two ends, and the second upper positioning post is installed in the vertical through hole. The lower template has a vertical through hole at a position directly below the second upper positioning post, and the second lower positioning post is installed in the vertical through hole. The small diameter section of the positioning pin passes between the lower end of the first upper positioning post and the upper end of the first lower positioning post. The center position between the lower end of the second upper positioning post and the upper end of the second lower positioning post is located on the center line of the axial positioning pin.

[0007] Preferably, in order to accurately radially position the metal tool body, reduce pressure damage to the metal tool body, and facilitate lower machining accuracy, the lower end face of the first upper positioning post, the upper end face of the first lower positioning post, the lower end face of the second upper positioning post, and the upper end face of the second lower positioning post are respectively provided with concave semi-elliptical grooves.

[0008] Preferably, in order to achieve the positioning and installation of the axial positioning pin and facilitate processing and assembly, the positioning pin mounting component includes a positioning pin mounting plate, a sliding seat, and a locking seat. The second end of the axial positioning pin is installed in the positioning pin mounting plate and cannot move axially. The positioning pin mounting plate and the sliding seat are connected by screws and are located together in the transverse through hole between the upper template and the lower template, and can move axially in the axial direction of the axial positioning pin. The end face of the sliding seat away from the positioning pin mounting plate is a sliding seat inclined surface. The upper template has a vertical through hole near the sliding seat inclined surface, and the locking seat is located in the vertical through hole. The lower end of the locking seat has a locking seat inclined surface near the sliding seat inclined surface. The sliding seat inclined surface and the locking seat inclined surface can fit tightly together.

[0009] Preferably, to facilitate the easy removal of the axial positioning pin after injection molding, the positioning pin mounting component further includes a toggle rod. The upper template has an oblique through hole located above the sliding seat, the sliding seat has an oblique through hole, and the lower template has an operating through hole located below the sliding seat and the locking seat. The lower end of the toggle rod passes obliquely through the oblique through hole of the upper template and the oblique through hole of the sliding seat from top to bottom and is located in the operating through hole. The upper end of the toggle rod has a rod cap with a larger outer diameter.

[0010] The beneficial effects of this utility model are as follows:

[0011] This invention achieves radial positioning of the metal blade of a minimally invasive surgical thin-walled tubular tool by installing two upper positioning pins and two lower positioning pins within the upper and lower templates, respectively. This results in more secure and reliable radial positioning of the metal blade, preventing movement during injection molding and ensuring a more precise overall length for the tool. Furthermore, by passing the small-diameter section of the positioning pin between the lower end of the first upper positioning pin and the upper end of the first lower positioning pin, the positioning of the end of the metal blade within the plastic drive handle of the tool becomes more precise and stable, better guaranteeing the coaxiality between the metal blade and the plastic drive handle and improving the quality of the embedded molding. Finally, by changing the groove on the end face of each positioning pin from a semi-circular groove to a semi-elliptical groove, the contact between the groove bottom and the metal blade changes from surface contact to line contact, achieving more precise radial positioning of the metal blade, reducing pressure damage, and facilitating lower groove machining precision, thus reducing processing efficiency and costs. Attached Figure Description

[0012] Figure 1 This is a front sectional view of a thin-walled tubular surgical instrument used in minimally invasive surgery.

[0013] Figure 2 This is a top view of the high-precision minimally invasive surgical thin-walled tubular blade embedding mold described in this utility model;

[0014] Figure 3 yes Figure 2 AA section view in the middle;

[0015] Figure 4 yes Figure 2 BB section view in the middle. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings:

[0017] like Figures 2-4 As shown, the high-precision minimally invasive surgical thin-walled tubular blade embedding mold of this utility model includes an upper template 7, a lower template 13, an upper cavity seat 10, a lower cavity seat 17, an upper positioning post, a lower positioning post, an axial positioning pin 16, and a positioning pin mounting component. The upper template 7 is installed above the lower template 13, the upper cavity seat 10 is installed inside the upper template 7, and the lower cavity seat 17 is installed inside the lower template 13. The outer diameter of a section of the axial positioning pin 16 near the first end of both ends is reduced to form a small diameter section 18. The second end of the axial positioning pin 16 is installed on the positioning pin mounting component. The positioning pin mounting component is installed inside the upper template 7 and the lower template 13 and is located near the first end of both ends (the first ends of the upper template 7 and the lower template 13 are at the same end). An injection cavity is formed between the lower part of the upper cavity seat 10 and the upper part of the lower cavity seat 17, and the small diameter section 18 of the positioning pin is located in this injection cavity. The upper positioning post includes a first upper positioning post 11 and a second upper positioning post 12. The positioning post 12 includes a first lower positioning post 19 and a second lower positioning post 20. The upper cavity seat 10 has a vertical through hole at a position away from the second end of the axial positioning pin 16, and the first upper positioning post 11 is installed in the vertical through hole. The lower cavity seat 17 has a vertical through hole at a position directly below the first upper positioning post 11, and the first lower positioning post 19 is installed in the vertical through hole. The upper template 7 has a vertical through hole at a position near the second end of its two ends (the second ends of the upper template 7 and the lower template 13 are at the same end), and the second upper positioning post 12 is installed in the vertical through hole. The lower template 13 has a vertical through hole at a position directly below the second upper positioning post 12, and the second lower positioning post 20 is installed in the vertical through hole. The small diameter section 18 of the positioning pin passes between the lower end of the first upper positioning post 11 and the upper end of the first lower positioning post 19. The center position between the lower end of the second upper positioning post 12 and the upper end of the second lower positioning post 20 is located on the center line of the axial positioning pin 16.

[0018] like Figures 1-4 As shown, this utility model also discloses the following more optimized specific structures:

[0019] In order to accurately radially position the metal cutter body 3, reduce the pressure damage to the metal cutter body 3, and facilitate the reduction of machining accuracy, the lower end face of the first upper positioning post 11, the upper end face of the first lower positioning post 19, the lower end face of the second upper positioning post 12, and the upper end face of the second lower positioning post 20 are respectively provided with concave semi-elliptical grooves (not visible in the figure, but easy to understand).

[0020] To facilitate the positioning and installation of the axial positioning pin 16 and for ease of processing and assembly, the positioning pin mounting component includes a positioning pin mounting plate 15, a sliding seat 14, and a locking seat 8. The second end of the axial positioning pin 16 is installed in the groove of the positioning pin mounting plate 15 and is blocked by the sliding seat 14, preventing axial movement. The positioning pin mounting plate 15 and the sliding seat 14 are connected by screws and are located together in the transverse through hole between the upper template 7 and the lower template 13, allowing axial movement of the axial positioning pin 16. The end face of the sliding seat 14 away from the positioning pin mounting plate 15 is a sliding seat inclined surface (not marked in the figure). The upper template 7 has a vertical through hole near the sliding seat inclined surface, and the locking seat 8 is located in the vertical through hole. The lower end of the locking seat 8 has a locking seat inclined surface (not marked in the figure) near the sliding seat inclined surface. The sliding seat inclined surface and the locking seat inclined surface can fit tightly together.

[0021] To facilitate the easy removal of the axial positioning pin 16 after injection molding, the positioning pin mounting component also includes a toggle rod 9. The upper template 7 is provided with an oblique through hole (not marked in the figure) above the sliding seat 14. The sliding seat 14 is provided with an oblique through hole (not marked in the figure). The lower template 13 is provided with an operation through hole (not marked in the figure) below the sliding seat 14 and the locking seat 8. The lower end of the toggle rod 9 passes obliquely through the oblique through hole of the upper template and the oblique through hole of the sliding seat from top to bottom and is located in the operation through hole. The upper end of the toggle rod 9 is provided with a rod cap with a larger outer diameter.

[0022] Figure 2 The image also shows four guide holes 5 on the upper template 7 and four guide posts 6 on the lower template 13. The four guide posts 6 pass through the four guide holes 5 from bottom to top, which is a conventional structure.

[0023] like Figures 1-4As shown, in use, first assemble the lower template 13 and the components installed within it. Then assemble the positioning pin mounting plate, sliding seat, and axial positioning pin 16 and place them in the corresponding positions on the lower template 13. Insert the small diameter section 18 of the axial positioning pin 16 into the tail end of the metal blade 3. Then place the upper template 7 above the lower template 13, so that the metal blade 3 is simultaneously located in the corresponding semi-elliptical grooves of the first lower positioning pin 19 and the second lower positioning pin 20. Then place the first upper positioning pin 11 and the second upper positioning pin 12 into the corresponding vertical through holes. Finally, place the locking seat 8 and the actuating rod 9 into the corresponding through holes. Inside the hole, the assembly of the entire mold and metal blade 3 is completed. The upper template 7 is connected to the upper mounting plate of the injection molding machine (not shown in the figure), and the lower template 13 is connected to the lower mounting plate of the injection molding machine to obtain a power source. Then, liquid plastic can be injected into the injection cavity formed between the lower part of the upper cavity seat 10 and the upper part of the lower cavity seat 17 through the injection holes (not marked in the figure) on the injection molding machine and the upper template 7 or the lower template 13. After it solidifies, the mold is disassembled, and the blade formed by embedding the metal blade 3 and the plastic transmission handle 1 is taken out. Then, it is polished according to requirements to obtain the finished product of the thin-walled tubular blade for minimally invasive surgery. Since the metal blade 3 is radially positioned in two positions by the first upper positioning post 11, the second upper positioning post 12, the first lower positioning post 19 and the second lower positioning post 20, and axially positioned by the axial positioning pin 16, the positioning of the metal blade 3 is stable and reliable, so it will not move during the injection molding process, and the embedding molding effect is good.

[0024] The above embodiments are merely preferred embodiments of this utility model and are not intended to limit the technical solutions of this utility model. Any technical solution that can be implemented based on the above embodiments without creative effort should be considered to fall within the scope of protection of this utility model patent.

Claims

1. A high-precision positioning mold for embedding a thin-walled tubular cutting tool in minimally invasive surgery, comprising an upper template, a lower template, an upper cavity seat, a lower cavity seat, an upper positioning post, a lower positioning post, an axial positioning pin, and a positioning pin mounting component. The upper template is mounted above the lower template, the upper cavity seat is mounted inside the upper template, the lower cavity seat is mounted inside the lower template, a section of the axial positioning pin with a reduced outer diameter near the first end of both ends forms a small-diameter section, the second end of the axial positioning pin is mounted on the positioning pin mounting component, the positioning pin mounting component is mounted inside the upper and lower templates and located near the first end of both ends, an injection molding cavity is formed between the lower surface of the upper cavity seat and the upper surface of the lower cavity seat, and the small-diameter section of the positioning pin is located within this injection molding cavity, characterized in that: The upper positioning post includes a first upper positioning post and a second upper positioning post, and the lower positioning post includes a first lower positioning post and a second lower positioning post. A vertical through hole is provided on the upper cavity seat at a position away from the second end of the axial positioning pin, and the first upper positioning post is installed in this vertical through hole. A vertical through hole is provided on the lower cavity seat directly below the first upper positioning post, and the first lower positioning post is installed in this vertical through hole. A vertical through hole is provided on the upper template near the second end of its two ends, and the second upper positioning post is installed in this vertical through hole. A vertical through hole is provided on the lower template directly below the second upper positioning post, and the second lower positioning post is installed in this vertical through hole. The small-diameter section of the positioning pin passes between the lower end of the first upper positioning post and the upper end of the first lower positioning post. The center position between the lower end of the second upper positioning post and the upper end of the second lower positioning post is located on the centerline of the axial positioning pin.

2. The high-precision positioning mold for the thin-walled tubular cutting tool used in minimally invasive surgery, as described in claim 1, is characterized in that: The lower end face of the first upper positioning post, the upper end face of the first lower positioning post, the lower end face of the second upper positioning post, and the upper end face of the second lower positioning post are each provided with a concave semi-elliptical groove.

3. The high-precision positioning minimally invasive surgical thin-walled tubular instrument embedding mold according to claim 1 or 2, characterized in that: The positioning pin mounting component includes a positioning pin mounting plate, a sliding seat, and a locking seat. The second end of the axial positioning pin is mounted in the positioning pin mounting plate and cannot move axially. The positioning pin mounting plate and the sliding seat are connected by screws and are located together in the transverse through hole between the upper template and the lower template, and can move axially with the axial positioning pin. The end face of the sliding seat away from the positioning pin mounting plate is a sliding seat inclined surface. The upper template has a vertical through hole near the sliding seat inclined surface, and the locking seat is located in the vertical through hole. The lower end of the locking seat has a locking seat inclined surface near the sliding seat inclined surface. The sliding seat inclined surface and the locking seat inclined surface can fit tightly together.

4. The high-precision positioning mold for the thin-walled tubular cutting tool in minimally invasive surgery as described in claim 3, characterized in that: The positioning pin mounting component also includes a toggle lever. The upper template has an oblique through hole located above the sliding seat, the sliding seat has an oblique through hole, and the lower template has an operation through hole located below the sliding seat and the locking seat. The lower end of the toggle lever passes obliquely through the oblique through hole of the upper template and the oblique through hole of the sliding seat from top to bottom and is located in the operation through hole. The upper end of the toggle lever has a lever cap with a larger outer diameter.

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