Asymmetric expanded polytetrafluoroethylene tube membrane preparation device

Abstract

The utility model relates to the technical field of artificial blood vessels, in particular to an asymmetric expanded polytetrafluoroethylene tube membrane preparation device, which is characterized in that an opening is formed in the side surface of a drying oven, matched inner and outer rails are arranged, and a net rack is connected with a sliding block in a sliding manner through the inner and outer rails, so that an operator can operate the device under the condition that the drying oven is not completely opened; the net rack loaded with the pipe film is easily pushed in or pulled out, the storing and taking process is greatly simplified, the working efficiency is improved, the influence of external air on the heating environment can be effectively reduced and the temperature is kept stable because operation is carried out only through the opening and the opening is quickly closed by the baffle, so that the heating effect is ensured, and the working efficiency is improved. The problems that the asymmetric expanded polytetrafluoroethylene tube film is inconvenient to store and fetch and is heated unevenly in the heating process are solved, the production efficiency is improved, and the quality and performance of an artificial blood vessel material are further guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of artificial blood vessels, in particular to a device for preparing an asymmetric expanded polytetrafluoroethylene tube membrane. Background Art

[0002] In the field of biomedical engineering, especially in the treatment of cardiovascular diseases, the development and application of artificial blood vessels are of great significance. For patients whose blood vessels are narrowed or blocked due to arteriosclerosis, trauma or congenital defects, artificial blood vessels provide an effective alternative to restore normal blood circulation.

[0003] At present, artificial blood vessels on the market are mainly made of expanded polytetrafluoroethylene (ePTFE) tubular membranes. In order to further improve the strength of the ePTFE tubular membrane and adjust the pore size of the inner and outer surfaces, ePTFE flat membranes with different pore sizes can be coated on the outer surface of the ePTFE tubular membrane by heating, thereby preparing an asymmetric expanded polytetrafluoroethylene tubular membrane.

[0004] As described in the expanded polytetrafluoroethylene artificial blood vessel with an integrated support ring and its preparation method (publication (announcement) number: CN118304469B): A preparation method of an expanded polytetrafluoroethylene artificial blood vessel with an integrated support ring includes the steps of wrapping a strip film around the outer surface of the tubular membrane, and then heating and shaping at 350°C-450°C to obtain an expanded polytetrafluoroethylene artificial blood vessel with an annular support structure. During the preparation process, the ePTFE tubular membrane needs to be placed under high temperature conditions for heat treatment and the heating time is short (within 6 minutes). However, in mass production, due to frequent placement or removal of products in the heating device, the internal heat loss of the heating device is serious and the temperature fluctuates greatly, thereby affecting product quality and production efficiency. Utility Model Content

[0005] The purpose of the utility model is to provide an asymmetric expanded polytetrafluoroethylene tube film preparation device, which is convenient for putting in or taking out the tube film by arranging an inner track and an outer track on the oven; and after putting in or taking out the tube film, the oven opening can be quickly closed with a baffle to prevent heat loss, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an asymmetric expanded polytetrafluoroethylene tube film preparation device, comprising: an oven; an opening is provided on the side of the oven, and an inner track and an outer track are respectively installed on the inner and outer sides of the opening; a group of grids for placing the asymmetric expanded polytetrafluoroethylene tube film are slidably connected to the inner and outer tracks through sliders; a baffle for closing the opening is installed on the side of the oven.

[0007] Preferably, the grid comprises:

[0008] a frame fixed to the top of the slide;

[0009] A steel pipe fixed to the inner side of the frame;

[0010] A limit block is connected to the top of the steel pipe and is used to limit the position of the asymmetric expanded polytetrafluoroethylene tube membrane.

[0011] Preferably, a V-shaped groove is formed on the top of the limit block, and a clamp for fixing on a steel pipe is connected to the bottom of the limit block.

[0012] Preferably, the clamping member comprises two groups of V-shaped spring pieces, and the two groups of V-shaped spring pieces are respectively fixed on two sides of the bottom of the limiting block.

[0013] Preferably, slide grooves are fixed on both sides of the opening, and the baffle is movably connected in the slide grooves.

[0014] Preferably, a locking bolt for locking the baffle is connected to the upper end of the slide groove.

[0015] Preferably, the inner track and the outer track both include a base and a track rod, the track rod is fixed to the top of the base, and the end of the base is fixed to the side wall of the oven.

[0016] Preferably, the butt ends of the two groups of track rods are both configured as arc-shaped chamfered structures.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] The utility model provides an opening on the side of the oven, and provides matching inner and outer tracks, and a grid frame slidably connected by the inner and outer tracks and a slider. The operator can easily push in or pull out the grid frame carrying the tube membrane without fully opening the oven, which greatly simplifies the access process and improves work efficiency. Since the operation only needs to be performed through the opening, it is not necessary to fully open the oven, and the opening can be quickly closed by the baffle, which can effectively reduce the influence of outside air on the heating environment, maintain the stability of temperature and humidity, thereby ensuring the heating effect, and solves the problems of inconvenient access and unstable heating temperature of asymmetric expanded polytetrafluoroethylene tube membrane during heating, which not only improves production efficiency, but also further guarantees the quality and performance of artificial blood vessel materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of the baffle of the utility model in the open state;

[0020] Figure 2 This is a schematic diagram of the structure of the baffle of the utility model in a closed state;

[0021] Figure 3It is a schematic diagram of the structure of the inner track and the outer track of the utility model;

[0022] Figure 4 It is a structural schematic diagram of the utility model grid;

[0023] Figure 5 This is a schematic diagram of the main structure of the limit block of the utility model;

[0024] Figure 6 It is a three-dimensional structural schematic diagram of the limit block of the utility model;

[0025] Figure 7 It is a structural schematic diagram of the chute of the utility model.

[0026] In the figure: 1, oven; 2, opening; 21, slide; 22, locking bolt; 3, inner track; 4, outer track; 5, grid; 51, frame; 52, steel pipe; 53, limit block; 54, V-shaped groove; 55, clamp; 56, V-shaped spring; 6, baffle; 7, slider; 8, base; 9, track rod. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] The utility model provides an asymmetric expanded polytetrafluoroethylene tube film preparation device, such as Figure 1-Figure 7 As shown, it includes: oven 1, inner track 3, outer track 4, grid 5, baffle 6, etc., which are mainly for facilitating the storage and access of tube film and reducing the loss of heat inside the oven during the storage and access process. The details are as follows:

[0029] In this embodiment, an opening 2 is provided on the side of the oven 1, and an inner track 3 and an outer track 4 are installed on the inner and outer sides of the opening 2 respectively; a group of grids 5 for placing asymmetric expanded polytetrafluoroethylene tube membranes are slidably connected to the inner track 3 and the outer track 4 through a slider 7, and the grid 5 is used to place the tube membrane, and the grid structure realizes uniform heating of the asymmetric expanded polytetrafluoroethylene tube membrane.

[0030] Furthermore, a baffle 6 for closing the opening 2 is installed on the side of the oven 1, and a slide groove 21 is fixed on both sides of the opening 2, and the baffle 6 is movably connected in the slide groove 21. The upper end of the slide groove 21 is connected with a locking bolt 22 for locking the baffle 6.

[0031] The main function of the baffle 6 is to seal the opening 2; after the grid 5 is moved into or out of the oven 1, the baffle 6 can quickly close the opening 2 to reduce the heat loss inside the oven.

[0032] Oven 1: As the core of the whole device, the oven is responsible for providing a constant temperature heating environment. The box is made of thermal insulation material to ensure that heat is not easily lost. There are heating elements and ventilation systems inside to maintain appropriate temperature and air circulation.

[0033] Opening 2: There is an opening on the side of the oven, and its position and size are carefully designed to facilitate the entry and exit of the grid while minimizing heat loss.

[0034] Inner track 3 and outer track 4: located inside and outside the opening, connected to the oven through the slide. These two tracks are used to carry the slider, ensuring the stability and guidance of the rack during movement, so that the operator can easily push or pull the rack out of the oven without fully opening the oven door, reducing the waste of heat energy.

[0035] Slider 7: connected between the grid and the inner and outer tracks, so that the grid can slide smoothly on the tracks. The design of the slider takes into account the friction and load-bearing capacity to ensure that the grid or the tube film will not be damaged during the movement.

[0036] Grid 5: Made of high temperature resistant material, its grid design can not only carry the ePTFE tube membrane, but also ensure the circulation of air, which is conducive to the hot air evenly covering the surface of the tube membrane and accelerating the drying process.

[0037] Baffle 6: Installed in the slide grooves 21 on both sides of the opening and fixed by locking bolts 22. The function of the baffle is to close the opening in the non-operating state to prevent heat loss and maintain the stability of the internal environment.

[0038] Furthermore, the grid 5 includes: a frame 51 fixed on the top of the slider 7; a steel pipe 52 fixed on the inner side of the frame 51; and a limit block 53 connected to the top of the steel pipe 52 for limiting the position of the asymmetric expanded polytetrafluoroethylene tube membrane. A V-shaped groove 54 is provided on the top of the limit block 53, and a clamp 55 for fixing on the steel pipe 52 is connected to the bottom of the limit block 53. The clamp 55 includes two groups of V-shaped spring pieces 56, and the two groups of V-shaped spring pieces 56 are respectively fixed on both sides of the bottom of the limit block 53.

[0039] Specifically,

[0040] Frame 51: The frame constitutes the basic structure of the grid, and its material is selected from high-strength light metal, such as aluminum alloy, to withstand high temperatures and maintain structural stability. The frame is fixed to the top of the slider 7 by welding or bolting to ensure the overall firmness of the grid.

[0041] Steel pipe 52: fixed on the inner side of frame 51, used as the support shaft of the asymmetric expanded polytetrafluoroethylene tube membrane. The diameter and length of the steel pipe are customized according to the size of the tube membrane to provide sufficient support force and ensure the balance of the tube membrane when rotating or stationary.

[0042] Limit block 53: connected to the top of steel tube 52, its design purpose is to limit the position of the tube film to prevent it from moving unnecessarily due to thermal expansion and contraction or air flow during the drying process. The shape and size of the limit block are optimized to accommodate tube films of different specifications.

[0043] V-shaped groove 54: opened on the top of the stopper 53, its V-shaped design can better fit the outer diameter of the tube membrane, provide a stable clamping force, and reduce the wear on the surface of the tube membrane. The angle and depth of the V-shaped groove need to be finely adjusted according to the characteristics of the tube membrane.

[0044] Clamp 55: used to fix the position of the limit block 53 on the steel pipe 52 to ensure its stability during the drying process. The clamp is designed to be adjustable to accommodate tube membranes of different diameters.

[0045] V-shaped springs 56: The main components of the clamp 55 are divided into two groups, which are respectively fixed on both sides of the bottom of the limit block 53. The V-shaped springs can be tightly fastened to the steel pipe by using their elastic characteristics, and can maintain good clamping force even under temperature changes during the drying process.

[0046] When using the device, the operator first places the asymmetric expanded polytetrafluoroethylene tube film on the steel pipe, and then performs preliminary positioning through the V-groove of the limit block. Then, by adjusting the V-shaped springs on the clamps, it fits tightly against the steel pipe to ensure that the tube film is fixed in position during the drying process. This design not only simplifies the operation process and improves production efficiency, but also effectively prevents the deformation and positional displacement of the tube film at high temperatures, ensuring the uniformity of drying and the quality of the tube film.

[0047] In one embodiment, the inner rail 3 and the outer rail 4 both include a base 8 and a rail rod 9, the rail rod 9 is fixed to the top of the base 8, the end of the base 8 is fixed to the side wall of the oven 1, and the butt ends of the two sets of rail rods 9 are both set to an arc chamfered structure.

[0048] Base 8: As the basic support of the track, the base is made of high-strength material, such as cast iron or steel, to ensure the stability and durability of the entire track system. The ends of the base are fixed to the side wall of the oven 1 by welding or bolts to ensure a firm connection between the track system and the oven.

[0049] Track rod 9: fixed on the top of the base 8, the material of the track rod should have good wear resistance and sliding performance, generally stainless steel or special alloy. The cross section of the track rod is designed to be circular or rectangular to meet the sliding requirements of the slider 7 and ensure the stability of the grid during movement.

[0050] Arc chamfer at the butt end: The butt end of the two sets of track rods 9, that is, the part where the inner track and the outer track meet, is designed as an arc chamfer structure. The purpose of this special design is to reduce the friction resistance of the slider during track conversion, ensure the smooth transition of the grid from the outside of the oven to the inside, and the smoothness of the reverse operation.

[0051] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An asymmetric expanded polytetrafluoroethylene tube film preparation device, characterized in that: include: Oven (1); An opening (2) is provided on the side of the oven (1), and an inner rail (3) and an outer rail (4) are respectively installed on the inner and outer sides of the opening (2); A group of grids (5) for placing asymmetric expanded polytetrafluoroethylene tube membranes are slidably connected on the inner track (3) and the outer track (4) via sliders (7); A baffle (6) for closing the opening (2) is installed on the side of the oven (1); The grid (5) comprises: A frame (51), wherein the frame (51) is fixed on the top of the slider (7); A steel pipe (52), wherein the steel pipe (52) is fixed on the inner side of the frame (51); A limit block (53), the limit block (53) being connected to the top of the steel tube (52) and used for limiting the position of the asymmetric expanded polytetrafluoroethylene tube membrane; The top of the limit block (53) is provided with a V-shaped groove (54), and the bottom of the limit block (53) is connected with a clamping piece (55) for fixing on the steel pipe (52).

2. The asymmetric expanded polytetrafluoroethylene tube film preparation device according to claim 1, characterized in that: The clamping member (55) comprises two groups of V-shaped spring sheets (56), and the two groups of V-shaped spring sheets (56) are respectively fixed on two sides of the bottom of the limiting block (53).

3. The asymmetric expanded polytetrafluoroethylene tube film preparation device according to claim 1, characterized in that: Slide grooves (21) are fixed on both sides of the opening (2), and the baffle (6) is movably connected in the slide grooves (21).

4. The device for preparing an asymmetric expanded polytetrafluoroethylene tube membrane according to claim 3, characterized in that: The upper end of the slide groove (21) is connected to a locking bolt (22) for locking the baffle (6).

5. The device for preparing an asymmetric expanded polytetrafluoroethylene tube membrane according to claim 1, characterized in that: The inner track (3) and the outer track (4) both comprise a base (8) and a track rod (9), wherein the track rod (9) is fixed to the top of the base (8), and the end of the base (8) is fixed to the side wall of the oven (1).

6. The device for preparing an asymmetric expanded polytetrafluoroethylene tube membrane according to claim 5, characterized in that: The butt ends of the two groups of track rods (9) are both arranged as arc-shaped chamfered structures.

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