Light-proof ventilation equipment

Abstract

The present application relates to a light-proof ventilation device for protecting the balloon segment when the hydrophilic coating of the balloon catheter is UV-cured, comprising a bracket shell and a bracket cover, wherein: the top surface of the bracket shell is provided with a first accommodating hole, the bracket cover comprises a top plate, the bracket cover can move between a first preset position and a second preset position relative to the bracket shell, a first vent and an air intake mechanism are provided on the side of the bracket shell, and in the second preset position, the side plate blocks the first vent and cooperates with the side gap of the bracket shell, so that the gas introduced into the internal space of the bracket shell from the air intake mechanism can flow to the outside from the first vent. The application ensures that the device is light-proof and ventilated by using a gap fit between the bracket shell and the bracket cover to coordinate the first vent on the bracket shell.

Description

Technical Field

[0001] The present specification relates to the technical field of medical devices, and in particular to a light-proof ventilation device. Background Art

[0002] Balloon catheters are a type of medical device commonly used in cardiovascular interventional surgery. In order to increase the pushing performance of balloon catheters and reduce the friction between them and human tissues, a layer of hydrophilic super-fat coating is usually cured by ultraviolet light on the outer surface of balloon catheters. This coating can effectively reduce the surface energy of the catheter and increase the wettability of the catheter surface. When the coating encounters water, it will be activated, making the catheter lubricated.

[0003] Usually, the hydrophilic coating on the balloon catheter needs to be obtained by UV curing. For some balloon catheters used in interventional surgeries, drugs are coated on the balloon, and the drugs are easily decomposed and denatured under ultraviolet radiation, so the balloon part needs to be protected from light. Currently, there is no special equipment for this process. Summary of the invention

[0004] In order to overcome the problems existing in the related art, a special device is provided for protecting the balloon segment when the hydrophilic coating of the balloon catheter is ultraviolet-cured.

[0005] The present application discloses a light-proof ventilation device for protecting a balloon segment when a hydrophilic coating of a balloon catheter is UV-cured, comprising a stent shell and a stent cover, wherein:

[0006] The top surface of the support shell is provided with a first accommodating hole, the first accommodating hole is connected to the outside and the internal space for accommodating the balloon segment;

[0007] The support cover comprises a top plate and a side plate, the support cover can move between a first preset position and a second preset position relative to the support housing, the first receiving hole has a first area for receiving a balloon catheter tube segment at the second preset position and a second area exposed at the first preset position and shielded by the top plate at the second preset position;

[0008] A first air vent and an air intake mechanism are provided on the side of the bracket shell. In the second preset position, the side panel covers the first air vent and cooperates with the side gap of the bracket shell so that the gas introduced into the internal space of the bracket shell from the air intake mechanism can flow to the outside from the first air vent.

[0009] Furthermore, the top plate is also provided with a second accommodating hole for cooperating with the first accommodating hole. In the first preset position, the second accommodating hole is opposite to the first accommodating hole to expose the first area and the second area. In the second preset position, the second accommodating hole is partially offset from the first accommodating hole to expose the first area.

[0010] Furthermore, the side plate is provided with a through hole, the through hole and the second receiving hole are connected to each other on the bracket cover, and the first vent hole and the first receiving hole are connected to each other on the bracket shell;

[0011] At the first preset position, the through hole and the first vent hole have a mutually overlapping channel area, and the area is used for the balloon catheter to be placed in the first receiving hole;

[0012] At the second preset position, the through hole is blocked by the bracket shell.

[0013] Furthermore, a first stopper is provided on the inner surface of the top surface of the bracket shell, and the first stopper is provided with a first through hole, and the first through hole forms the first area and at least a part of the second area.

[0014] Furthermore, a second stopper is provided on the outer surface of the top plate, the second stopper is provided with a second through hole, the second through hole forms at least a part of the second accommodating hole, and at the second preset position, the first through hole separates the first area and the second area through the second through hole.

[0015] Furthermore, the air intake mechanism is arranged on two opposite side surfaces of the bracket shell, and the air intake mechanism includes an air intake hole and an exhaust silencer installed on the air intake hole. The exhaust silencer is located in the internal space of the bracket shell, and the air intake holes on the two side surfaces are symmetrically positioned.

[0016] Furthermore, the air intake mechanism also includes an air intake plate, the air intake hole is arranged on the air intake plate, openings are provided on both sides of the bracket shell, the air intake plate is installed on the outer surface of the opening, and a gas inlet connected to the air intake hole is also provided on the side of the air intake plate, and the gas can enter the internal space from the gas inlet through the air intake hole.

[0017] Furthermore, the first region is adapted to accommodate a catheter section of a balloon catheter.

[0018] Furthermore, it also includes a connecting section, one end of which is connected to the first accommodating hole, and the other end is connected to the first ventilation hole, and the width of the connecting section gradually increases from the one end to the other end. In the first preset position, the connecting section exposes the second accommodating hole, and in the second preset position, the connecting section is blocked by the top plate.

[0019] Furthermore, the bracket shell is provided with a plurality of first communication areas formed by the first accommodating holes and the first ventilation holes, and the bracket cover is provided with second communication areas formed by the second accommodating holes and the through holes, the same number as the first communication areas, and the first communication areas are arranged on opposite sides of the bracket shell. Correspondingly, the second communication areas are correspondingly arranged on opposite sides of the bracket cover, and second ventilation holes are provided on the side surfaces of the bracket shell, and the second ventilation holes are located between adjacent first ventilation holes. At the second preset position, the side panel blocks the second ventilation holes.

[0020] The technical solution provided by the embodiments of the present application may have the following beneficial effects:

[0021] The bracket shell and the bracket cover adopt clearance fit to cooperate with the first vent hole on the bracket shell to provide an outflow channel for gas circulation, which not only ensures that the gas can flow from the inside of the bracket shell to the outside to achieve a cooling effect, but also takes into account the light-shielding requirements of the equipment.

[0022] In addition, the movable cooperation between the bracket shell and the bracket cover not only facilitates the placement and clamping of the balloon catheter, but also provides a high light-shielding effect for the equipment.

[0023] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of a hydrophilic coated balloon catheter;

[0025] Figure 2 It is a structural schematic diagram of the light-proof ventilation device of the present application;

[0026] Figure 3 yes Figure 2 A schematic diagram of the structure of the middle bracket shell;

[0027] Figure 4 yes Figure 3 A partial enlarged view of the middle A;

[0028] Figure 5 yes Figure 2 A schematic diagram of the structure of the bracket cover;

[0029] Figure 6 yes Figure 5 A partial enlarged view of point B in the middle;

[0030] Figure 7 This is an embodiment of the first receiving hole and the second receiving hole of the present application;

[0031] Figure 8 yes Figure 2 A top view of the first stopper and the second stopper at the first preset position and the second preset position at the center C (the bracket housing, bracket cover plate and air intake mechanism are hidden in the figure);

[0032] Fig. 9 yes Figure 2 A schematic diagram of the structure of the light-proof ventilation device in another state;

[0033] Fig.10 yes Fig. 9 A partial enlarged view of point D in the middle;

[0034] Fig.11 are three other embodiments of the first through hole and the second through hole of the present application;

[0035] Fig.12 yes Figure 2 Schematic diagram of the structure of the air intake mechanism.

[0036] Reference numerals:

[0037] 100, bracket shell; 11, first accommodating hole; 111, first area; 112, second area; 12, first ventilation hole; 13, connecting section; 14, second ventilation hole; 15, first connecting area; 200, bracket cover; 21, top plate; 22, side plate; 23, second accommodating hole; 24, through hole; 25, second connecting area; 300, first stopper; 31, first through hole; 400, second stopper; 41, second through hole; 500, air intake mechanism; 51, air intake hole; 52, gas inlet; 53, air intake plate; 600, balloon catheter; 61, balloon section; 62, catheter section. DETAILED DESCRIPTION

[0038] Figure 1 The present invention is a structural diagram of a hydrophilic coating balloon catheter 600 (referred to as: balloon catheter). The balloon catheter includes a balloon segment 61 and a catheter segment 62. When the balloon catheter 600 is subjected to ultraviolet irradiation, the balloon segment 61 of the balloon catheter 600 needs to be protected to avoid drug decomposition of the balloon segment 61 and heat adhesion of the balloon segment 61. To this end, the present application discloses a light-proof ventilation device for protecting the balloon segment when the hydrophilic coating of the balloon catheter is ultraviolet-cured. When the balloon segment 61 of the balloon catheter 600 needs to be protected from light, the balloon segment 61 can be placed in the light-proof ventilation device of the present application, which can effectively block ultraviolet light and cool the balloon segment 61, thereby avoiding the decomposition of the drug on the balloon segment 61 and heat adhesion of the balloon segment 61.

[0039] Figure 2 This is a schematic diagram of the structure of the light-proof ventilation equipment (hereinafter referred to as equipment) of this application. Figure 2As shown, the device includes a bracket housing 100, a bracket cover plate 200 and an air intake mechanism 500. The material of the device can be selected from metal materials, such as stainless steel, etc., to prevent the device from being deformed due to ultraviolet radiation or high temperature. The bracket cover plate 200 is covered on the bracket housing 100 and can move relative to the bracket housing 100. The bracket cover plate 200 has two preset positions relative to the bracket housing 100, namely a first preset position and a second preset position, and moves between the two positions. Preferably, the bracket cover plate 200 can slide back and forth between the first preset position and the second preset position. Figure 2 The bracket cover 200 is shown in the second preset position.

[0040] refer to Figure 3 and Figure 4 ,in Figure 3 yes Figure 2 Schematic diagram of the structure of the middle bracket shell, Figure 4 yes Figure 3 A partial enlarged view of point A in the middle. The support shell 100 is a rectangular parallelepiped having a top surface, a bottom surface and side surfaces. An internal space is formed between the top surface, the bottom surface and the side surfaces of the support shell 100 for accommodating the balloon segment 61 of the balloon catheter 600. A first accommodating hole 11 is provided on the top surface of the support shell 100. The exposed area of ​​the first accommodating hole 11 is different in area at the first preset position and the second preset position. The balloon catheter 600 enters the interior of the support shell 100 at the first preset position. At the second preset position, the first accommodating hole 11 is partially blocked by the support cover 200 to reduce the light transmission area of ​​the device. Preferably, when the first accommodating hole 11 is at the second preset position, the unblocked portion is suitable for accommodating the catheter segment 62 of the balloon catheter 600, that is, the unblocked portion is adapted to the shape of the catheter segment 62.

[0041] refer to Figure 5 and Figure 6 ,in Figure 5 yes Figure 2 Schematic diagram of the structure of the middle bracket cover. Figure 6 for Figure 5 The bracket cover 200 includes a top plate 21 and a side plate 22, wherein the top plate 21 has a second receiving hole 23, and when the bracket cover 200 is in the first preset position, the first receiving hole 11 is exposed from the second receiving hole 23 on the surface of the bracket cover 200. When the bracket cover 200 is in the second preset position, the top plate 21 can partially cover the first receiving hole 11.

[0042] Figure 7This is an embodiment of the first receiving hole and the second receiving hole of the present application, wherein (I) indicates when in the first preset position, and (II) indicates when in the second preset position. When the stent cover 200 is in the first preset position, the first receiving hole 11 is directly opposite to the second receiving hole 23, and the first receiving hole 11 can be exposed from the top plate 21 through the second receiving hole 23. At this time, the balloon catheter 600 can be placed into the internal space of the stent shell 100 from the area where the first receiving hole 11 and the second receiving hole 23 overlap each other. After that, the stent cover 200 is moved to the second preset position, the first receiving hole 11 and the second receiving hole 23 are partially staggered, and the first receiving hole 11 is separated into a first area 111 for accommodating the catheter segment 62 and a second area 112 covered by the top plate 21 through the second receiving hole 23. In this way, at the second preset position, a clamping force can be formed between the first receiving hole 11 and the second receiving hole 23 to clamp the catheter segment 62 in the first area 111, thereby reducing the shaking of the balloon segment 61.

[0043] When the support cover 200 is in the second preset position, the device is in a light-shielded state, and the hydrophilic coating of the balloon catheter 600 fixed on the device can be UV-cured. However, as the UV irradiation time goes by, the internal temperature of the device will gradually increase. To solve this problem, the present application uses gas flow to take away the heat to cool the device. Figure 2 , Figure 3 As shown, a first vent hole 12 and an air intake mechanism 500 are also provided on the side of the bracket housing 100. The first vent hole 12 and the air intake mechanism 500 may be located on the same side of the bracket housing 100, or on different sides, preferably on different sides. When located on the same side, the air intake mechanism 500 may be located at the lower part of the side, and the first vent hole 12 may be located at the upper part of the side.

[0044] Since the air intake mechanism 500 needs to be connected to the air pump pipeline, after being connected to the air pump pipeline, the air pump pipeline can form a light-proof protection for the air intake mechanism 500. Therefore, for the air intake mechanism 500, there is no need to worry about ultraviolet light entering the interior of the device from the air intake mechanism 500. There must be air outlet if there is air intake, but what kind of air outlet structure is most suitable? For this device, light protection is the most important. If it is impossible to effectively avoid light due to cooling, this is undoubtedly putting the cart before the horse. For other devices, the hole outlet method is the simplest, but for this device, since it has higher requirements for light protection, if the hole outlet is used, it is easy to cause ultraviolet light to enter the interior of the device from the air outlet, affecting or damaging the balloon segment 61. Therefore, a structure that can both ensure light protection and achieve air outlet is needed.

[0045] To this end, the present application sets the side of the bracket housing 100 and the side plate 22 of the bracket cover 200 to be clearance-fitted. The clearance-fitting means that the side of the bracket housing 100 and the side plate 22 of the bracket cover 200 are not tightly fitted, but a space is provided for gas to flow out. The clearance-fitting of the side plate 22 and the bracket housing 100 cooperates with the first vent hole 12 provided on the side of the bracket housing 100 to form a gas outflow channel.

[0046] When the bracket cover 200 is in the second preset position, the side panel 22 blocks the first vent hole 12 and forms a gas flow space with the side of the bracket shell 100 provided with the first vent hole 12, so that the gas introduced into the inside of the bracket shell 100 by the air intake mechanism 500 can flow from the first vent hole 12 to the space and then flow to the outside of the device.

[0047] The clearance fit between the support cover plate 200 and the support housing 100 not only ensures light protection and ventilation, but also has the advantages of simple structure and good processing. In addition, the support cover plate 200 also has a certain blocking effect on the outflowing gas, reducing the violent disturbance of the gas at the first vent hole 12.

[0048] according to Figure 7 In the embodiment shown, the balloon segment 61 of the balloon catheter 600 can vertically enter the space inside the stent shell 100 from the overlapping area of ​​the first accommodating hole 11 and the second accommodating hole 23 when the stent cover 200 is in the first preset position. However, placing the balloon segment 61 in this way requires raising the balloon segment 61 to a certain height. In addition, the equipment is usually placed at a certain height. It is difficult for the operator to determine whether the balloon segment 61 is aligned with the overlapping area of ​​the first accommodating hole 11 and the second accommodating hole 23, which makes the placement of the balloon segment 61 more difficult. Improper operation may also easily lead to damage to the balloon segment 61. In order to facilitate the balloon segment 61 of the balloon catheter 600 to enter the internal space of the stent shell 100, refer to Fig. 9 and Fig.10 As shown, Fig. 9 for Figure 2 The structural diagram of the device when it is in the second preset position, Fig.10 yes Fig. 9The partial enlarged view at D in the middle. The present application further connects the first vent hole 12 and the first receiving hole 11 to each other, so that the first receiving hole 11 and the first vent hole 12 form a first connecting area 15 on the bracket shell 100. The first connecting area 15 connects the side and top surface of the bracket shell 100. At the same time, a through hole 24 is provided on the side plate 22 of the bracket cover 200, and the through hole 24 and the second receiving hole 23 are connected to each other on the bracket cover 200 to form a second connecting area 25, and the second connecting area 25 connects the side plate 22 and the top plate 21 of the bracket cover 200. When the bracket cover 200 is in the first preset position, the first connecting area 15 and the second connecting area 25 are connected to each other, so that there is a continuous through area from the side to the top surface of the bracket shell 100 between the first connecting area 15 and the second connecting area 25, and the balloon segment 61 of the balloon catheter 600 can be vertically translated from the side of the bracket shell 100 into the internal space of the bracket shell 100 through the continuous through area. When the support cover 200 is located at the second preset position, Figure 2 The first connecting area 15 is partially staggered with the second connecting area 25 . Specifically, the through hole 24 is blocked by the bracket shell 100 , and the first vent hole 12 is blocked by the bracket cover 200 . Therefore, ultraviolet light cannot enter the internal space of the bracket shell 100 through the first vent hole 12 .

[0049] The through hole 24 provided on the support cover 200 can not only serve as a passage for the balloon catheter 600 to enter the support shell 100, but also effectively reduce airway resistance. When the support cover 200 is in the second preset position, the side plate 22 of the support cover 200 covers the first vent 12. In the absence of the through hole 24, the gas can only flow out from the edge of the support cover 200. However, when the through hole 24 is present, the gas can flow from the first vent 12 to the space reserved between the side of the support shell 100 and the side plate 22 of the support cover 200, and then flow from the space to the through hole 24, and then flow to the external space, avoiding the gas from only flowing from the edge of the support cover 200 to the external space, increasing the gas outlet area, and shortening the length of the gas flow channel.

[0050] Further, refer to Figure 4 and 10 As shown, a connecting section 13 is further provided on the bracket housing 100, one end of the connecting section 13 is connected to the first vent hole 12, and the other end is connected to the first receiving hole 11, and the width of the connecting section 13 gradually decreases from one end of the first vent hole 12 to the other end, so as to guide the balloon catheter 600 into the first receiving hole 11. At the first preset position, the connecting section 13 can be exposed from the second receiving hole 23, and at the second preset position, the connecting section 13 is blocked by the top plate 21.

[0051] In order to facilitate equipment processing and manufacturing, refer to Figure 4 and Figure 6As shown, a first stopper 300 is provided on the inner surface of the bracket housing 100, and the first stopper 300 can be regarded as a part of the bracket housing 100. A first through hole 31 is provided on the first stopper 300, and the first through hole 31 constitutes at least a part of the first receiving hole 11. A second stopper 400 is provided on the outer surface of the bracket cover 200, and the second stopper 400 can also be regarded as a part of the bracket cover 200. A second through hole 41 is provided on the second stopper 400, and the second through hole 41 constitutes at least a part of the second receiving hole 23. The first stopper 300 and the second stopper 400 can be made of polytetrafluoroethylene or other polymer materials that are relatively easy to process.

[0052] refer to Figure 8 As shown, Figure 8 for Figure 2 The top view of the first block and the second block at the first preset position and the second preset position after the bracket cover, bracket housing and air intake mechanism are removed at C, where (I) represents the first preset position and (II) represents the second preset position. In this embodiment, when it is located at the first preset position, the first through hole 31 is exposed; when it is located at the second preset position, the first through hole 31 is only partially exposed, wherein the exposed portion is the first area 111 and the blocked portion is the second area 112.

[0053] Fig.11 Three other embodiments of the first through hole and the second through hole are given, where (I) represents the first preset position and (II) represents the second preset position. For the first embodiment, the first through hole 31 is linear and the second through hole 41 is L-shaped. At the first preset position, the first through hole 31 and a part of the second through hole 41 overlap. For the second embodiment, the first through hole 31 is L-shaped and the second through hole 41 is T-shaped. At the first preset position, the first through hole 31 and a part of the second through hole 41 overlap. For the third embodiment, the first through hole 31 and the second through hole 41 are both linear, the difference being that the first through hole 31 is perpendicular to the movement direction of the bracket cover 200, while the second through hole 41 is parallel to the movement direction of the bracket cover 200. At the second preset position, the second through hole 41 of the three embodiments can separate the first through hole 31 into the first area 111 and the second area 112. Fig.11 Embodiments and Figure 8 In the embodiment, the first through holes 31 have at least one linear through area perpendicular to the movement direction of the support cover 200, and the second through holes 41 have at least one linear through area parallel to the movement direction of the support cover 200. Of course, the linear through areas of the first through holes 31 and / or the second through holes 41 can also be made very short as long as they can include the first area 111.

[0054] refer to Figure 2 and Fig.12 The air intake mechanism 500 includes an air intake hole 51, a gas inlet 52 and an air intake plate 53. The air intake hole 51 and the gas inlet 52 are both arranged on the air intake plate 53. The two sides of the bracket housing 100 are provided with openings, and the air intake plate 53 is fixed to the outer surface of the openings. The air intake hole 51 is located on the side of the air intake plate 53 close to the inside of the bracket housing 100, that is, Fig.12 The air inlet 51 shown is located inside the support shell 100, while the side of the air inlet plate 53 away from the inside of the support shell 100 has no air inlet 51. The gas inlet 52 is arranged on the side of the air inlet plate 53 and is connected with the air inlet 51. The gas can enter the internal space of the support shell 100 from the gas inlet 52 through the air inlet 51. Here, the gas inlet 52 can be connected to multiple air inlets 51, which greatly simplifies the number of air inlet pipes. Since the flow of gas can easily cause the balloon catheter 600 to shake, further, the air inlet holes 51 on both sides of the support shell 100 can be symmetrically arranged front and back, and the shaking of the balloon catheter 600 can be reduced by the mutual offset of the gas. Further, the air intake mechanism 500 can also include an exhaust silencer (not shown in the figure) installed on the air inlet 51. By using the exhaust silencer, the gas entering the device is dispersed more slowly, avoiding the local airflow from being too large, causing the shaking of the balloon segment 61.

[0055] Return to reference Figure 3 and Figure 4 In order to enable the device to process multiple balloon catheters 600 at one time, a plurality of first connecting areas 15 are provided on the bracket shell 100, and the bracket cover 200 is provided with the same number of second connecting areas 25 as the first connecting areas 15, wherein the first connecting areas 15 are arranged on opposite sides of the bracket shell 100, and correspondingly, the second connecting areas 25 are correspondingly arranged on opposite sides of the bracket cover 200.

[0056] A second vent hole 14 is also provided on the side of the bracket housing 100. The second vent hole 14 is located between adjacent first vent holes 12. When in the second preset position, the second vent hole 14 can be covered by the side plate 22 of the bracket cover 200. The design of the second vent hole 14 can not only reduce the counterweight, but also play the same effect as the first vent hole 12 in reducing the gas flow resistance.

Claims

1. A light-proof ventilation device for protecting the balloon segment when the hydrophilic coating of the balloon catheter is UV-cured, characterized in that: It includes a bracket shell and a bracket cover, wherein: The top surface of the support shell is provided with a first accommodating hole, the first accommodating hole is connected to the outside and the internal space for accommodating the balloon segment; The support cover comprises a top plate and a side plate, the support cover can move between a first preset position and a second preset position relative to the support housing, the first receiving hole has a first area for receiving a catheter segment of a balloon catheter at the second preset position and a second area exposed at the first preset position and shielded by the top plate at the second preset position, the shape of the first area being adapted to receive the catheter segment of the balloon catheter; A first air vent and an air intake mechanism are provided on the side of the bracket shell. In the second preset position, the side panel covers the first air vent and cooperates with the side gap of the bracket shell so that the gas introduced into the internal space of the bracket shell from the air intake mechanism can flow to the outside from the first air vent.

2. The light-shielding ventilation device according to claim 1, characterized in that: The top plate is also provided with a second accommodating hole for cooperating with the first accommodating hole. In the first preset position, the second accommodating hole is opposite to the first accommodating hole to expose the first area and the second area. In the second preset position, the second accommodating hole is partially offset from the first accommodating hole to expose the first area.

3. The light-shielding ventilation device according to claim 2, characterized in that: The side plate is provided with a through hole, the through hole and the second receiving hole are connected to each other on the bracket cover, and the first vent hole and the first receiving hole are connected to each other on the bracket shell; At the first preset position, the through hole and the first vent hole have a mutually overlapping channel area, and the area is used for the balloon catheter to be placed in the first receiving hole; At the second preset position, the through hole is blocked by the bracket shell.

4. The light-shielding ventilation device according to claim 3, characterized in that: A first stopper is disposed on the inner surface of the top surface of the bracket shell, and the first stopper is disposed with a first through hole, and the first through hole forms the first area and at least a part of the second area.

5. The light-shielding ventilation device according to claim 4, characterized in that: The outer surface of the top plate is provided with a second stopper, the second stopper is provided with a second through hole, the second through hole forms at least a part of the second accommodating hole, and at the second preset position, the first through hole separates the first area and the second area through the second through hole.

6. The light-proof ventilation device according to any one of claims 1 to 5, characterized in that: The air intake mechanism is arranged on two opposite sides of the bracket shell, and includes an air intake hole and an exhaust silencer installed on the air intake hole. The exhaust silencer is located in the internal space of the bracket shell, and the air intake holes on the two sides are symmetrically positioned.

7. The light-shielding ventilation device according to claim 6, characterized in that: The air intake mechanism also includes an air intake plate, the air intake hole is arranged on the air intake plate, both sides of the bracket shell are provided with openings, the air intake plate is installed on the outer surface of the opening, and the side of the air intake plate is also provided with a gas inlet interconnected with the air intake hole, and the gas can enter the internal space from the gas inlet through the air intake hole.

8. The light-shielding ventilation device according to claim 3, characterized in that: It also includes a connecting section, one end of which is connected to the first accommodating hole, and the other end is connected to the first ventilation hole, and the width of the connecting section gradually increases from the one end to the other end. At the first preset position, the connecting section exposes the second accommodating hole, and at the second preset position, the connecting section is blocked by the top plate.

9. The light-shielding ventilation device according to claim 3, characterized in that: The bracket shell is provided with a plurality of first communication areas formed by the first accommodating holes and the first ventilation holes, and the bracket cover is provided with second communication areas formed by the second accommodating holes and the through holes, the same number as the first communication areas, the first communication areas are arranged on opposite sides of the bracket shell, and correspondingly, the second communication areas are correspondingly arranged on opposite sides of the bracket cover, and second ventilation holes are provided on the side surfaces of the bracket shell, the second ventilation holes are located between adjacent first ventilation holes, and at the second preset position, the side panel blocks the second ventilation holes.

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