Device capable of preparing diameter-variable expanded polytetrafluoroethylene tube membrane

Abstract

The utility model relates to the technical field of artificial blood vessels, in particular to a device capable of preparing a variable-diameter expanded polytetrafluoroethylene tube membrane, which comprises a working table, a guide column is fixedly connected to the top of the working table, a movable plate is slidably connected to the outside of the guide column, a top plate is fixedly connected to the top of the guide column, and heating sleeves are arranged at the bottom of the top plate. The top of the movable plate is connected with a conical column which is matched with the heating sleeve and is used for sleeving an expanded polytetrafluoroethylene tube membrane through a fixing assembly; the bottom of the workbench is connected with a lifting assembly used for driving the movable plate to move up and down. The conical column is installed on the movable plate through the fixing assembly, the conical column can be conveniently replaced according to needs, the heating sleeve is matched with the conical column, the ePTFE pipe film is heated through the heating sleeve so that the ePTFE pipe film can be softened and shaped, the diameter of a final product is determined by the shape of the conical column, and the ePTFE pipe film can be conveniently replaced according to the specific needs of a patient. The artificial blood vessel accurately matched with the required diameter is prepared.

Description

Technical Field

[0001] The utility model relates to the technical field of artificial blood vessels, in particular to a device for preparing an expanded polytetrafluoroethylene tube film with variable diameter. Background Technique

[0002] In modern medicine, as an important biomedical material, artificial blood vessels are widely used in vascular surgery. Especially when treating uremic patients, they are used to construct an artificial blood vessel arteriovenous fistula for hemodialysis. When constructing an artificial blood vessel arteriovenous fistula, in order to improve the matching of the artificial blood vessel with the autologous blood vessel and reduce the risk of steal syndrome, one end of the artificial blood vessel needs to be made into a gradually changing conical structure.

[0003] Polytetrafluoroethylene (PTFE), especially expanded polytetrafluoroethylene (ePTFE), has become one of the ideal choices for artificial blood vessel materials due to its excellent biocompatibility, antithrombotic property and durability. However, at present, the expanded polytetrafluoroethylene tube films used for preparing artificial blood vessels on the market all have a fixed diameter and cannot be processed with variable diameter. Content of the Utility Model

[0004] The purpose of the utility model is to provide a device for preparing an expanded polytetrafluoroethylene tube film with variable diameter, which can flexibly adjust the diameter of the blood vessel during preparation and effectively improve the applicability of the artificial blood vessel, so as to solve the problems put forward in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A device for preparing an expanded polytetrafluoroethylene tube film with variable diameter, including a workbench, a guide post is fixedly connected to the top of the workbench, a movable plate is slidably connected to the outside of the guide post and a top plate is fixedly connected to the top of the guide post, heating sleeves are arranged at the bottom of the top plate, and a conical column for sleeving the expanded polytetrafluoroethylene tube film and matching with the heating sleeves is connected to the top of the movable plate through a fixing component; a lifting component for driving the movable plate to move up and down is connected to the bottom of the workbench.

[0006] Preferably, the fixing component includes a screw rod and a screw hole;

[0007] The screw rod is located outside the conical column, the screw hole is opened on the top of the movable plate, and the conical column is fixed on the movable plate through the screw rod and the screw hole.

[0008] Preferably, the fixing component includes a fixing block, a fixing hole and a positioning member;

[0009] The fixing block is fixed on the top of the movable plate, the fixing hole is opened at the bottom end of the conical column, and the conical column is fixed on the fixing block through the positioning member.

[0010] Preferably, the positioning member includes two groups of strong magnets;

[0011] The two groups of the powerful magnets are respectively fixed inside the fixing holes and on the top of the fixing block, and the tapered column is fixed on the fixing block by the two groups of powerful magnets.

[0012] Preferably, the positioning member includes a positioning screw hole and a positioning screw;

[0013] The positioning screw hole is opened on one side of the fixing hole, and the positioning screw is screwed into the positioning screw hole and abuts against the fixing block.

[0014] Preferably, the cross sections of the fixing block and the fixing hole are both rectangular structures.

[0015] Preferably, the lifting assembly includes a lifter and a lifting frame;

[0016] The base end of the lifter is installed at the bottom of the workbench, and the working end is connected to the lifting frame;

[0017] The end of the lifting frame penetrates through the workbench and is connected to the bottom of the movable plate.

[0018] Preferably, the tapered column includes a cylindrical portion and a tapered portion, and the tapered portion is fixed at the top end of the cylindrical portion.

[0019] Compared with the prior art, the beneficial effects of the present utility model are:

[0020] In this application, the tapered column is installed on the movable plate through the fixing assembly, which is convenient for replacing the tapered column as needed. Through the cooperation of the heating sleeve and the tapered column, the heating sleeve heats the ePTFE tube film to make it soft and plastic. The shape of the tapered column determines the diameter of the final product, and an artificial blood vessel with a diameter precisely matching the required diameter can be prepared according to the specific needs of the patient. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of the device for preparing a variable-diameter expanded polytetrafluoroethylene tube film in the first embodiment of the present utility model;

[0022] Figure 2 It is a schematic structural diagram of the lifting assembly in the first embodiment of the present utility model;

[0023] Figure 3 It is a schematic structural diagram of the tapered column extending into the heating sleeve in the first embodiment of the present utility model;

[0024] Figure 4 It is a schematic structural diagram of the tapered column in the first embodiment of the present utility model;

[0025] Figure 5 It is a schematic structural diagram of the fixing assembly in the second embodiment of the present utility model;

[0026] Figure 6 Schematic diagram of the fixing component structure in the third embodiment of the present utility model;

[0027] Figure 7 Schematic diagram of the fixing component structure in the fourth embodiment of the present utility model.

[0028] In the figure: 1, workbench; 2, guide post; 3, top plate; 4, heating sleeve; 5, tapered column; 51, cylindrical part; 52, tapered part; 6, movable plate; 7, lifting component; 71, lifter; 72, lifting frame; 11, screw; 12, screw hole; 13, fixing block; 14, fixing hole; 15, strong magnet; 16, positioning screw hole; 17, positioning screw. Specific embodiments

[0029] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0030] Embodiment 1

[0031] Please refer to Figures 1 - 4 , in this embodiment, a device for preparing a variable-diameter expanded polytetrafluoroethylene tube film is provided, including a workbench 1. Legs are provided at the bottom of the workbench 1, and two groups of guide posts 2 are fixedly connected to the top of the workbench 1. They are respectively located at both ends of the workbench and are vertically fixed on the workbench to guide the up and down movement of the movable plate 6, ensuring the linearity and stability of its movement.

[0032] The movable plate 6 and the top plate 3 are respectively slidably connected to the outside and the top of the guide post 2. The movable plate 6 is connected to the guide post 2 through a linear bearing. Heating sleeves 4 are arranged at the bottom of the top plate 3 to heat the expanded polytetrafluoroethylene material to a plastic state. The heating sleeves are arranged at the bottom of the top plate and are parallel to the guide posts to uniformly heat the tube film, ensuring uniform expansion and forming quality of the material.

[0033] A tapered column 5 that is matched with the heating sleeve 4 and is used for sleeving the expanded polytetrafluoroethylene tube film is connected to the top of the movable plate 6 through a fixing component; the tapered column is connected to the movable plate through a fixing component, and its shape is designed as a gradually tapered cone for sleeving and forming the expanded polytetrafluoroethylene tube film. The diameter and length of the tapered column can be replaced with different specifications according to processing requirements.

[0034] Among them, the heating sleeve 4 includes a shell and an electric heating wire, and the heating temperature is 260 - 320 degrees Celsius.

[0035] As Figure 4 shown, the tapered column 5 includes a cylindrical portion 51 and a tapered portion 52. The tapered portion 52 is fixed to the top end of the cylindrical portion 51. The expanded polytetrafluoroethylene tube film is sleeved on the tapered portion 52, and then the expanded polytetrafluoroethylene tube film is inserted into the heating sleeve 4 for heat setting.

[0036] It should be noted that multiple groups of the heating sleeve 4 and the tapered column 5 can be set as needed. A lifting assembly 7 for driving the movable plate 6 to move up and down is connected to the bottom of the workbench 1. The lifting assembly 7 includes a lifter 71 and a lifting frame 72;

[0037] The base end of the lifter 71 is installed at the bottom of the workbench 1, and the working end is connected to the lifting frame 72; the end of the lifting frame 72 penetrates through the workbench 1 and is connected to the bottom of the movable plate 6. Driving the tapered column 5 to move up and down by the lifter 71 facilitates inserting or removing the tapered column 5 into or out of the heating sleeve 4. When the polytetrafluoroethylene tube film is placed on the tapered column and enters the heating sleeve area, the heating sleeve heats the tube film to an appropriate temperature, causing it to expand and closely adhere to the surface of the tapered column, forming the required tube film shape.

[0038] In addition, the lifter 71 can be a hydraulic cylinder, an electric push rod, etc.

[0039] Embodiment 2

[0040] As Figure 5 shown, in this embodiment, the above-mentioned fixing assembly includes a screw 11 and a screw hole 12;

[0041] Screw 11: The screw is fixed to the outside of the tapered column 5, usually made of metal, and has sufficient strength to withstand the stress during the heating and forming process. The number and distribution of the screws should ensure the balance and stability of the tapered column on the movable plate.

[0042] Screw hole 12: Screw holes matching the screws are pre-opened at the top of the movable plate 6. The positions and numbers of the screw holes need to correspond to the screws on the tapered column to facilitate the positioning and fixing of the tapered column.

[0043] Operation steps

[0044] Tapered column selection: Select the corresponding specification of the tapered column 5 according to the diameter and length of the expanded polytetrafluoroethylene tube film to be prepared.

[0045] Screw alignment: Align the screw 11 on the tapered column with the screw hole 12 on the movable plate 6 to ensure that their positions are accurate.

[0046] Fixed connection: Insert the screw into the screw hole and tighten it until the tapered column is firmly fixed on the movable plate. In some cases, it may be necessary to use lock washers or other anti-loosening fittings to further ensure the reliability of the connection.

[0047] Inspection and confirmation: After fixation, check whether the tapered column is firm and centered to avoid deviation or instability during the heating and forming processes.

[0048] The advantages are as follows

[0049] Quick replacement: Through the connection method of the screw and the screw hole, the tapered column with different diameters can be quickly replaced, greatly improving the flexibility and production efficiency of the device.

[0050] Firm connection: The threaded connection provides sufficient mechanical strength to ensure the stability of the tapered column during processing and prevent displacement due to vibration or external forces.

[0051] Easy maintenance: Due to the simple structure, the fixing components are easy to maintain and inspect, reducing the complexity and cost of daily maintenance.

[0052] In summary, this fixing component based on the screw and the screw hole not only simplifies the installation and replacement process of the tapered column, but also ensures the stability and precision during the processing, and is a key component for realizing efficient and flexible production of variable-diameter expanded polytetrafluoroethylene tube membranes.

[0053] Embodiment 3

[0054] As Figure 6 shown, in this embodiment, the above-mentioned fixing component includes a fixing block 13, a fixing hole 14 and a positioning member;

[0055] The fixing block 13 is fixed on the top of the movable plate 6, the fixing hole 14 is opened at the bottom end of the tapered column 5, and the tapered column 5 is fixed on the fixing block 13 through the positioning member.

[0056] The positioning member includes two groups of strong magnets 15; the two groups of strong magnets 15 are respectively fixed inside the fixing hole 14 and on the top of the fixing block 13, and the tapered column 5 is fixed on the fixing block 13 through the two groups of strong magnets 15.

[0057] The fixing component proposed in this embodiment uses the magnetic fixing method, which not only simplifies the installation and replacement process of the tapered column, but also enhances the overall stability and production efficiency of the device.

[0058] Fixing block 13: The fixing block is fixed on the top of the movable plate 6, and its design needs to consider the matching with the tapered column 5 and the mechanical strength of the whole device to ensure the stable fixation of the tapered column during the heating and forming processes.

[0059] Fixing hole 14: The fixing hole opened at the bottom end of the tapered column is used to accommodate the strong magnet, and its depth and diameter need to match the size of the magnet to ensure the complete embedding of the magnet and the center of gravity balance of the tapered column.

[0060] Powerful magnets 15: Two sets of powerful magnets are respectively fixed inside the fixing holes and on top of the fixing blocks. When selecting the magnets, their magnetic force intensity should be considered to ensure the stable connection of the tapered column and facilitate manual disassembly and replacement. The polarity layout of the magnets should be designed to attract each other to maximize the connection stability.

[0061] Operation steps

[0062] Magnet pre-installation: Pre-install a set of powerful magnets inside the fixing holes at the bottom end of the tapered column to ensure they are fully embedded and fixed.

[0063] Alignment and positioning: Align the bottom end of the tapered column with the fixing block on the movable plate, paying attention to the polarity direction of the magnets to ensure that the two sets of magnets can attract correctly.

[0064] Magnetic connection: When the tapered column approaches the fixing block, the attraction between the magnets will automatically adsorb the tapered column onto the fixing block to complete the quick installation.

[0065] Check stability: After the installation is completed, gently shake the tapered column to check whether it is stably connected to ensure that it will not be displaced during the subsequent processing.

[0066] Utilizing the characteristics of magnetic connection, the quick installation and disassembly of the tapered column can be realized, significantly improving the production efficiency and the flexibility of the equipment. The strong attraction provided by the powerful magnets ensures the stability of the tapered column during the processing, and it will not be displaced even during the heating and forming processes. Compared with the traditional threaded connection, the magnetic fixation will not leave permanent marks on the material, reducing the costs of equipment maintenance and part replacement. The design of magnetic connection simplifies the operation process, reduces the requirements for the operator's skills, and also reduces the downtime during the production process.

[0067] Through the description of the above specific implementation manners, the fixing component adopting magnetic fixation not only meets the requirements of quick replacement and stable connection, but also improves the overall performance of the device, providing a more efficient and convenient solution for the preparation of the variable-diameter expanded polytetrafluoroethylene tube film.

[0068] Example 4

[0069] As Figure 7 shown, in this embodiment, the above-mentioned fixing component includes a fixing block 13, a fixing hole 14 and a positioning member;

[0070] The fixing block 13 is fixed on the top of the movable plate 6, the fixing hole 14 is opened at the bottom end of the tapered column 5, and the tapered column 5 is fixed on the fixing block 13 through the positioning member.

[0071] The positioning member includes a positioning screw hole 16 and a positioning screw 17; the positioning screw hole 16 is opened on one side of the fixing hole 14, and the positioning screw 17 is tightened in the positioning screw hole 16 and abuts against the fixing block 13. The material and length of the positioning screw should be properly selected to ensure sufficient fixing force without damaging the tapered column or the fixing block.

[0072] Specifically, align the fixing hole at the bottom end of the tapered column with the fixing block on the movable plate to ensure the accurate position between the two. Insert the positioning screw into the positioning screw hole. At this time, the tapered column is preliminarily positioned above the fixing block. Use an appropriate tool (such as a wrench or a screwdriver) to gradually tighten the positioning screw until it completely abuts against the fixing block, ensuring that the tapered column is firmly fixed on the fixing block and will not move due to external forces. Finally, check whether the tapered column is firmly fixed on the fixing block without looseness or inclination to ensure the stability of the tapered column during the heating and forming processes.

[0073] In another embodiment, the cross-sections of the above-mentioned fixing block 13 and fixing hole 14 are both rectangular structures, which is beneficial to fixing the angle of the tapered column 5 and preventing it from rotating randomly. In addition, the cross-sections of the fixing block 13 and fixing hole 14 can be set into other shapes except circular, as long as they can limit the angle of the tapered column 5.

[0074] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for preparing a variable diameter expanded polytetrafluoroethylene tube film, comprising a workbench (1), the top of the workbench (1) is fixedly connected to a guide column (2), the outer portion and the top of the guide column (2) are slidably connected to a movable plate (6) and fixedly connected to a top plate (3), respectively, characterized in that: A heating sleeve (4) is arranged at the bottom of the top plate (3), and a cone column (5) for sleeve-connecting an expanded polytetrafluoroethylene tube membrane and matching the heating sleeve (4) is connected to the top of the movable plate (6) through a fixing component; The bottom of the workbench (1) is connected to a lifting assembly (7) for driving the movable plate (6) to move up and down.

2. The device for preparing a variable diameter expanded polytetrafluoroethylene tube membrane according to claim 1, characterized in that: The fixing assembly comprises a screw rod (11) and a screw hole (12); The screw rod (11) is located outside the conical column (5), the screw hole (12) is opened on the top of the movable plate (6), and the conical column (5) is fixed on the movable plate (6) through the screw rod (11) and the screw hole (12).

3. The device for preparing a variable diameter expanded polytetrafluoroethylene tube membrane according to claim 1, characterized in that: The fixing assembly comprises a fixing block (13), a fixing hole (14) and a positioning member; The fixing block (13) is fixed on the top of the movable plate (6), the fixing hole (14) is opened at the bottom end of the cone column (5), and the cone column (5) is fixed on the fixing block (13) through a positioning piece.

4. The device for preparing a variable diameter expanded polytetrafluoroethylene tube membrane according to claim 3, characterized in that: The positioning member comprises two groups of strong magnets (15); The two groups of strong magnets (15) are respectively fixed inside the fixing hole (14) and on the top of the fixing block (13), and the cone column (5) is fixed on the fixing block (13) via the two groups of strong magnets (15).

5. The device for preparing a variable diameter expanded polytetrafluoroethylene tube membrane according to claim 3, characterized in that: The positioning member comprises a positioning screw hole (16) and a positioning screw rod (17); The positioning screw hole (16) is opened on one side of the fixing hole (14), and the positioning screw rod (17) is screwed into the positioning screw hole (16) and pressed against the fixing block (13).

6. The device for preparing a variable diameter expanded polytetrafluoroethylene tube membrane according to claim 3, characterized in that: The cross sections of the fixing block (13) and the fixing hole (14) are both rectangular structures.

7. The device for preparing a variable diameter expanded polytetrafluoroethylene tube membrane according to claim 1, characterized in that: The lifting assembly (7) comprises a lifter (71) and a lifting frame (72); The base end of the lifter (71) is installed at the bottom of the workbench (1), and the working end is connected to the lift frame (72); The end of the lifting frame (72) passes through the workbench (1) and is connected to the bottom of the movable plate (6).

8. The device for preparing a variable diameter expanded polytetrafluoroethylene tube membrane according to claim 1, characterized in that: The cone column (5) comprises a cylindrical portion (51) and a cone portion (52), and the cone portion (52) is fixed on the top end of the cylindrical portion (51).

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