CN219397308U - Medical device - Google Patents

Abstract

The utility model relates to medical equipment, which comprises a shell, an air inlet shielding structure and an air outlet shielding structure, wherein the shell is provided with a hollow cavity, and an air inlet and an air outlet are formed in the shell; the air inlet shielding structure is arranged at the air inlet and used for shielding rays at the air inlet, and an air channel which is used for communicating the air inlet with the outside is arranged between the air inlet shielding structure and the shell; the air outlet shielding structure is arranged at the air outlet and is used for shielding rays at the air outlet, and the air outlet shielding structure is communicated with the air outlet and the outside; the air duct, the air inlet, the cavity, the air outlet and the air outlet shielding structure are sequentially communicated, so that a heat dissipation channel is provided for air circulation. Through set up shielding structure in order to shield the ray of air intake and air outlet department in air intake and air outlet department, realize the heat transfer of the inside cavity of casing through the circulation of the interior air of heat dissipation passageway to with the spare part to in the cavity dispels the heat.

Description

Medical device

Technical Field

The utility model relates to the technical field of medical equipment, in particular to medical equipment.

Background

As a non-destructive imaging technique, a computed tomography (CT, computed Tomography) technique, by means of X-ray microscopy and X-ray tomographic reconstruction techniques, can provide an image of the internal structure of a scanned object without trauma, and its application in clinical medicine has been one of important markers of medical technological progress since the 20 th century. In the use process of the CT, a great amount of heat is generated in the operation process of each part, so that a ventilation air duct for air flow circulation is required to be arranged in the shell for air flow exchange inside and outside the shell, and heat dissipation of each part in the CT is realized.

The air inlet and the air outlet which are communicated with the ventilation air duct on the shell of the CT machine in the related art are not shielded for rays, so that the rays are easy to leak, and the risk of harming operators is caused.

Disclosure of Invention

Based on this, it is necessary to provide a medical device for solving the technical problem of poor shielding performance of the medical device in the prior art.

A medical device, the medical device comprising:

the shell is provided with a hollow cavity, and an air inlet and an air outlet are formed in the shell;

the air inlet shielding structure is arranged at the air inlet and used for shielding rays at the air inlet, and an air channel which is communicated with the air inlet and the outside is arranged between the air inlet shielding structure and the shell;

the air outlet shielding structure is arranged at the air outlet and is used for shielding rays at the air outlet, and the air outlet shielding structure is communicated with the air outlet and the outside;

the air duct, the air inlet, the cavity, the air outlet and the air outlet shielding structure are sequentially communicated, so that a heat dissipation channel is provided for air circulation.

In one embodiment, the air inlet shielding structure includes:

the cover body is arranged opposite to the shell and can shield the air inlet, and a gap is formed between the cover body and the shell;

one end of the connecting sleeve is connected with the edge of the shell corresponding to the air inlet, the other end of the connecting sleeve is connected with the cover body, a plurality of vent holes are formed in the connecting sleeve, and the gaps, the vent holes and the inner holes of the connecting sleeve are communicated and define the air duct.

In one embodiment, the cover body is provided with a concave space with one open end, the mouth part of the concave space faces the shell, the connecting sleeve is connected with the bottom wall of the concave space, the outer wall surface of the connecting sleeve is spaced from the side wall of the concave space, a gap is reserved between the end surface corresponding to the periphery of the cover body and the shell, and the vent hole is formed in the end part of one end of the connecting sleeve, facing the bottom wall of the concave space.

In one embodiment, the air outlet shielding structure is provided with a negative pressure cavity communicated with the outside, and the air outlet shielding structure is connected to the air outlet so that the negative pressure cavity is communicated with the heat dissipation channel.

In one embodiment, the air outlet shielding structure includes:

a housing having a hollow interior to construct the negative pressure chamber;

the air inlet grille is connected to the shell, the air inlet grille is connected to an air outlet on the shell, a first ventilation gap on the air inlet grille is communicated with an inner cavity of the shell and the heat dissipation channel, and the extending direction of the first ventilation gap is inclined to the extending direction of the particle rays.

In one embodiment, the air inlet grille comprises:

the grid body is provided with a containing cavity with two open ends and is used for being connected with the shell and the shell;

the grid plates are arranged in the accommodating cavity and are spaced, the grid plates are connected to the grid body, the first ventilation gap is defined between every two adjacent grid plates, and the extending direction of the grid plates is inclined to the axis of the grid body.

In one embodiment, the grid plate comprises:

the first partition plate is inclined with the axis of the grid body;

and the second partition plate is also inclined with the axis of the grid body, and the second partition plate and the first partition plate are connected with each other and are opposite in inclination direction.

In one embodiment, at least one side of the housing is provided with an air outlet grille, a second air vent gap on the air outlet grille is communicated with the inner cavity of the housing, and the extending direction of the second air vent gap is inclined with the extending direction of the particle beam.

In one embodiment, the air outlet shielding structure further comprises a fan, wherein the fan is arranged in the shell, and the fan is used for enabling the inner cavity of the shell to generate negative pressure so as to form the negative pressure cavity.

In one embodiment, the shell comprises a protective layer and a shielding layer which are connected with each other, the protective layer is arranged outside the shielding layer in a surrounding mode, and the shielding layer is used for absorbing radiation of particle rays.

The utility model has the beneficial effects that:

the utility model provides medical equipment, wherein a cavity of a shell in the medical equipment is used for accommodating parts of the medical equipment, an air inlet shielding structure is connected to an air inlet of the shell, so that rays at the air inlet are shielded through the air inlet shielding structure, and particle rays are prevented from leaking from the air inlet; the air outlet shielding structure is arranged at the air outlet to shield rays at the air outlet so as to prevent particle rays from leaking from the air outlet. And through set up the wind channel with air intake and external intercommunication between air intake shielding structure and casing, through set up the form that all communicates with air outlet and external with air outlet shielding structure to make wind channel, air intake, cavity, air outlet and air outlet shielding structure communicate in proper order, in order to form the heat dissipation passageway that supplies the circulation of air, realize the heat transfer of the cavity inside of casing through the circulation of air in the heat dissipation passageway, thereby dispel the heat with the spare part in the cavity. Through the structure, the heat dissipation is realized, and meanwhile, the leakage of particle rays can be reduced, so that the heat dissipation performance of medical equipment can be improved, and the use safety performance can be improved.

Drawings

FIG. 1 is a schematic diagram of the external structure of a small animal CT machine according to an embodiment of the present utility model;

fig. 2 is a schematic diagram of an internal structure of a medical device according to an embodiment of the present utility model;

fig. 3 is a schematic structural diagram of an air outlet shielding structure in a medical device according to an embodiment of the present utility model;

fig. 4 is a schematic structural diagram of an air inlet grille in a medical device according to an embodiment of the present utility model;

fig. 5 is a schematic cross-sectional view of an air inlet grille in a medical device according to an embodiment of the present utility model.

A housing 10; a side case 101; a cover plate 102; an air inlet 103; an air outlet 104;

an air inlet shielding structure 20; a cover body 201; a connecting sleeve 202;

an air outlet shielding structure 30; a negative pressure chamber 301; a housing 302; an air inlet grill 303; a grill body 3031; grid plate 3032; a first diaphragm 3032a; a second diaphragm 3032b; a first ventilation gap 3033; an outlet grille 304; a blower 305; a tuyere 306;

a frame 40.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

The embodiment of the utility model provides medical equipment, which comprises the following structural form of medical equipment. The medical device provided by the utility model can be any device which works by using particle rays, wherein the particle rays can be any one of X rays, alpha rays, beta rays and gamma rays. Such medical devices may be, for example, CT devices, RT devices, DR devices, MR devices, PET devices, IGRT devices, etc. As shown in fig. 1, the medical device may also be a small animal CT machine, which includes a gantry 40 and a medical device in a form of a structure that is connected to the gantry 40. The housing 40 is used to support the entire medical device. The following describes the specific structure of a medical device for use in a small animal CT machine.

Referring to fig. 2 to 5, the medical device further provided by the present utility model includes a housing 10, an air inlet shielding structure 20 and an air outlet shielding structure 30, where the housing 10 has a hollow cavity, and an air inlet 103 and an air outlet 104 are formed on the housing 10; the air inlet shielding structure 20 is arranged at the air inlet 103, the air inlet shielding structure 20 is used for shielding rays at the air inlet 103, and an air channel which is used for communicating the air inlet 103 with the outside is arranged between the air inlet shielding structure 20 and the shell 10; the air outlet shielding structure 30 is arranged at the air outlet 104, the air outlet shielding structure 30 is used for shielding rays at the air outlet 104, and the air outlet shielding structure 30 is communicated with the air outlet 104 and the outside; the air duct, the air inlet 103, the cavity, the air outlet 104 and the air outlet shielding structure are sequentially connected to provide a heat dissipation channel for air circulation (as shown by arrows in fig. 2).

The cavity of the housing 10 in the medical device of the present technical solution is used for accommodating components of the medical device, and the air inlet 103 of the housing 10 is connected with the air inlet shielding structure 20, so as to shield rays at the air inlet 103 through the air inlet shielding structure 20, so as to prevent particle rays from leaking from the air inlet 103; the radiation at the air outlet 104 is shielded by providing the air outlet shielding structure 30 at the air outlet 104 to prevent the particle radiation from leaking from the air outlet 104. And through set up the wind channel with air intake 103 and external intercommunication between air intake shielding structure 20 and casing 10 to make wind channel, air intake 103, cavity, air outlet 104 and air outlet shielding 30 be linked together in proper order, in order to form the heat dissipation passageway that supplies the circulation of air, realize the heat transfer of the inside cavity of casing 10 through the circulation of air in the heat dissipation passageway, thereby with the spare part to dispel the heat in the cavity. Through the structure, the particle beam leakage can be reduced while the heat dissipation is realized, so that the heat dissipation performance of the medical equipment is improved, and the use safety performance is improved.

It should be noted that, the housing 10 in this embodiment may be used as the housing 302 of the CT apparatus for small animals, and the shape of the housing 302 may be set according to the specific requirements of the CT apparatus. For example, the case may be provided to include a side case 101 in which the inside of the side case 101 is hollow, both ends have openings, the openings of both ends communicate with the inner cavities of the side case, and two cover plates 102 provided at both ends of the side case 101, respectively. The side case 101 may be cylindrical or may have a polygonal external shape in cross section in the lateral direction. In this embodiment, the air inlet 103 is disposed on a side wall of the housing 10, and the air outlet 104 is disposed on the cover 102 of the housing 10, and both the air inlet 103 and the air outlet 104 penetrate through the housing wall of the housing 10, so that both the air inlet 103 and the air outlet 104 are communicated with the cavity of the housing 10.

The housing 10 comprises an interconnected shielding layer and a shielding layer (not shown in the figures), the shielding layer surrounding the shielding layer, the shielding layer being intended to absorb radiation of the particle beam. Wherein, the protective layer can be made of metal materials such as stainless steel, or polymer materials; the shielding layer is made of a material capable of absorbing radiation of the particle rays, such as a lead-containing material. The shielding layer is used for protecting the shielding layer and internal parts, and the shielding layer is used for attenuating internally reflected and scattered particle rays so as to protect a user.

As shown in fig. 2, the structural form of the air inlet shielding structure 20 is not limited, as long as a gap for air circulation can be formed between the air inlet shielding structure 20 and the housing 10 while the air inlet 103 of the housing 10 is shielded, so that a necessary condition can be provided for air circulation while preventing radiation from leaking from the air inlet 103. In general, the particle beam may extend along a straight line, and the air may be circulated through the space. Therefore, shielding of rays can be achieved by shielding one air inlet shielding structure 20 at the air inlet 103, ventilation and replacement of air can be achieved, and heat dissipation can be further conducted on the structure in the shell 10.

Specifically, as shown in fig. 2, the air inlet shielding structure 20 includes a cover body 201 and a connecting sleeve 202, where the cover body 201 is disposed opposite to the housing 10 and can shield the air inlet 103, and a gap is provided therebetween; one end of the connecting sleeve 202 is connected with the edge corresponding to the air inlet on the shell 10, the other end of the connecting sleeve 202 is connected with the cover body 201, a plurality of vent holes are arranged on the connecting sleeve 202, and the gaps, the vent holes and the inner holes of the connecting sleeve 202 are communicated and define an air flue. The connecting sleeve 202 is used for connecting the cover body 201 with the housing 10, and the cover body 201 is used for shielding the air inlet 103. A gap is arranged between the cover body 201 and the shell 10, and a vent hole is arranged on the connecting sleeve 202, so that the gap is connected with an inner hole of the connecting sleeve 202 through the vent hole on the connecting sleeve 202, and an air channel communicated with the air inlet 103 on the shell 10 is formed, thereby providing an air channel for air circulation. It should be noted that, since the connecting sleeve 202 is connected to the housing 10 and the cover body 201, and the cover body 201 is disposed opposite to the housing 10, then the axial direction of the connecting sleeve 202 should be consistent with the opening direction of the air inlet 103, then the side wall of the connecting sleeve 202 is provided with the vent hole, and the extending direction of the vent hole is at least not parallel to the inner hole of the connecting sleeve 202, so that the radiation in the housing 10 is blocked by the connecting sleeve 202 and the cover body 201, thereby preventing the radiation leakage, but the air for radiating the internal structure of the housing 10 can enter the housing 10 from the vent hole. The arrangement not only shields rays, but also can realize ventilation of air, thereby realizing heat dissipation of the internal structure of the shell 10, and improving the use safety of the whole CT machine.

Further, as shown in fig. 2, the cover body 201 has a concave space with one open end, the mouth of the concave space faces the housing 10, the connecting sleeve 202 is connected with the bottom wall of the concave space, a gap is formed between the end face corresponding to the periphery of the cover body 201 and the housing 10, and the vent hole is formed at the end of the connecting sleeve 202 facing the bottom wall of the concave space. Through the structure, a labyrinth type air duct is formed between the cover body 201 and the connecting sleeve 202, so that the ray leakage prevention effect can be further improved, and the ventilation of air can be satisfied.

In one embodiment, as shown in fig. 1 and 3, the air outlet shielding structure 30 has a negative pressure cavity 301 in communication with the outside, and the air outlet shielding structure 30 is connected to the air outlet 104, so that the negative pressure cavity 301 is in communication with the heat dissipation channel. By arranging the air outlet shielding structure 30 with the negative pressure cavity 301 at the air outlet 104 and communicating the negative pressure cavity 301 with the heat dissipation channel, air flows into the negative pressure cavity 301 from the heat dissipation channel through the pressure difference between the air outlet shielding structure 30 and the heat dissipation channel, and then flows out of the negative pressure cavity 301, and heat of each part in the shell 10 is taken away through air circulation, so that heat dissipation of the structure in the shell 10 is realized. By providing the air outlet shielding structure 30 as described above, the air circulation rate in the heat dissipation passage can be increased, thereby improving the heat dissipation effect of the entire housing 10.

Specifically, as shown in fig. 4 and 5, the air outlet shielding structure 30 includes a housing 302 and an air inlet grill 303, and the interior of the housing 302 is hollow to construct a negative pressure cavity 301; the air inlet grille 303 is connected to the shell 302, the air inlet grille 303 is connected to the air outlet 104 on the shell 10, the first ventilation gap 3033 on the air inlet grille 303 is communicated with the inner cavity of the shell 302 and the heat dissipation channel, and the extending direction of the first ventilation gap 3033 is inclined to the extending direction of the particle rays. The air inlet grill 303 is connected to the housing 302, and the first ventilation gap 3033 of the air inlet grill 303 communicates with the inner cavity of the housing 302 and the heat radiation passage, so that the air discharged from the heat radiation passage flows into the negative pressure chamber 301 through the first ventilation gap 3033 and then flows out of the negative pressure chamber 301. The air inlet grille 303 is arranged on the housing 302 of the air outlet shielding structure 30, so that on one hand, the contact area between the air flowing out of the heat dissipation channel and the structure on the air outlet shielding structure 30 can be increased, and on the other hand, the heat dissipation purpose is accelerated, and on the other hand, the opening area of the air outlet 104 can be reduced, so that the air flow rate is improved, and the heat dissipation efficiency of the whole medical equipment is further improved. In this embodiment, the extending direction of the first ventilation gap 3033 is set to be inclined to the extending direction of the particle beam, so that the grid can shield the particle beam, thereby preventing the particle beam from leaking, and improving the shielding performance of the whole medical apparatus.

The extending direction of the first ventilation gap 3033 is not limited, and may be linear, curved, or folded, as long as it can block the particle beam by the grid.

In this embodiment, as shown in fig. 4 and 5, the air inlet grille 303 includes a grille body 3031 and a plurality of grille plates 3032 disposed in the accommodating cavity at intervals, the grille body 3031 having an accommodating cavity with two open ends, the grille body 3031 being used for connecting with the housing 302 and the casing 10; the grating plates 3032 are connected to the grating body 3031, and a first ventilation gap 3033 is defined between each two adjacent grating plates 3032, and the extending direction of the grating plates 3032 is inclined to the axis of the grating body 3031. Wherein the grill body 3031 is used to connect the housing 302 and the case 10, and a plurality of grill plates 3032 are spaced apart to form a first ventilation gap 3033. By setting the extending direction of the grating plate 3032 to be inclined to the axis of the grating body 3031, rays can be blocked by the grating plate 3032, thereby preventing leakage of rays.

Further, as shown in fig. 5, the grid plate 3032 includes a first separator 3032a and a second separator 3032b, the first separator 3032a being inclined to the axis of the grid body 3031; the second diaphragm 3032b is also inclined to the axis of the grill body 3031, and the second diaphragm 3032b and the first diaphragm 3032a are connected to each other with the inclination directions thereof being opposite to each other. Through the above structural style, a certain angle is formed between the first diaphragm 3032a and the second diaphragm 3032b, so that the extending direction of the first ventilation gap 3033 is a one-fold line type, and the effect of preventing the radiation leakage is further improved.

In one embodiment, as shown in fig. 3, at least one side of the housing 302 is provided with an air outlet grille 304, and a second air-through gap on the air outlet grille 304 is communicated with the inner cavity of the housing 302, and the extending direction of the second air-through gap is inclined to the extending direction of the particle beam. The air outlet grille 304 is used for exhausting air in the negative pressure cavity 301, and the extending direction of the second air outlet gap is set to be inclined to the extending direction of the particle rays, so that the leakage of the rays entering the air outlet shielding structure 30 can be prevented, and the effect of the medical equipment on shielding the particle rays is improved. It should be noted that, regarding the structural form of the air outlet grille 304, the extending direction of the second air outlet gap may be a straight line type inclined to the ray, or may be a fold line type.

In this application, the housing 302, the air inlet grille 303 and the air outlet grille 304 are made of radiation-proof shielding materials to attenuate the particle rays reflected and scattered from the interior, so as to protect the user.

In one embodiment, as shown in fig. 3, the air outlet shielding structure 30 further includes a blower 305, the blower 305 is disposed in the housing 302, and the blower 305 is configured to generate negative pressure in the inner cavity of the housing 302, so as to form a negative pressure cavity 301. By providing blower 305 within housing 302, blower 305 is energized to create a negative pressure within housing 302. So that the hot air flowing out of the heat dissipation channel passes through the air inlet grille 303 and the fan 305 and is discharged from the air outlet grille 304. It should be noted that, in this embodiment, a horn-shaped air nozzle 306 is further disposed between the blower 305 and the air inlet grille 303, one end of the air nozzle 306 is connected to the inner wall of the housing 302 and is communicated with the air inlet grille 303, the other end of the air nozzle 306 is communicated with the air suction opening of the blower 305, and a gap is formed between the air nozzle 306 and the blower 305 for air to flow out. The horn mouth-shaped tuyere 306 is provided to guide the circulation of air, thereby improving the fluidity of air to improve the heat dissipation effect.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (10)

1. A medical device, the medical device comprising:

the shell (10) is provided with a hollow cavity, and an air inlet (103) and an air outlet (104) are formed in the shell (10);

the air inlet shielding structure (20) is arranged at the air inlet (103), the air inlet shielding structure (20) is used for shielding rays at the air inlet (103), and an air channel for communicating the air inlet (103) with the outside is arranged between the air inlet shielding structure (20) and the shell (10);

the air outlet shielding structure (30) is arranged at the air outlet (104), the air outlet shielding structure (30) is used for shielding rays at the air outlet (104), and the air outlet shielding structure (30) is communicated with the air outlet (104) and the outside;

the air duct, the air inlet (103), the cavity, the air outlet (104) and the air outlet shielding structure are sequentially communicated, so that a heat dissipation channel is provided for air circulation.

2. The medical device according to claim 1, wherein the air inlet shielding structure (20) comprises:

the cover body (201) is arranged opposite to the shell (10) and can shield the air inlet (103), and a gap is formed between the cover body and the shell;

one end of the connecting sleeve (202) is connected with the edge of the shell (10) corresponding to the air inlet, the other end of the connecting sleeve is connected with the cover body (201), a plurality of vent holes are formed in the connecting sleeve (202), and the gaps, the vent holes and the inner holes of the connecting sleeve (202) are communicated and define the air duct.

3. The medical device according to claim 2, wherein the cover body (201) is provided with a concave space with one open end, the mouth of the concave space faces the shell (10), the connecting sleeve (202) is connected with the bottom wall of the concave space, the outer wall surface of the connecting sleeve (202) is spaced from the side wall of the concave space, a gap is formed between the end surface corresponding to the periphery of the cover body (201) and the shell (10), and the vent hole is formed in the end part of one end of the connecting sleeve (202) facing the bottom wall of the concave space.

4. A medical device according to any one of claims 1-3, wherein the air outlet shielding structure (30) is provided with a negative pressure cavity (301) in communication with the outside, and the air outlet shielding structure (30) is connected to the air inlet (103) so that the negative pressure cavity (301) is in communication with the heat dissipation channel.

5. The medical device according to claim 4, wherein the air outlet shielding structure (30) comprises:

-a housing (302) hollow inside to construct said negative pressure cavity (301);

the air inlet grille (303) is connected to the shell (302), the air inlet grille (303) is connected to an air inlet (103) on the shell (10), a first ventilation gap (3033) on the air inlet grille (303) is communicated with an inner cavity of the shell (302) and the heat dissipation channel, and the extending direction of the first ventilation gap (3033) is inclined to the extending direction of particle rays.

6. The medical device according to claim 5, wherein the air inlet grille (303) comprises:

a grill body (3031) having a housing cavity with both ends open, the grill body (3031) being for connection with the housing (302) and the case (10);

the grid plates (3032) are arranged in the accommodating cavity at intervals, the grid plates (3032) are connected to the grid body (3031), the first ventilation gaps (3033) are defined between every two adjacent grid plates (3032), and the extending direction of the grid plates (3032) is inclined to the axis of the grid body (3031).

7. The medical device according to claim 6, wherein the grid plate (3032) comprises:

a first diaphragm (3032 a) inclined to the axis of the grill body (3031);

and a second diaphragm (3032 b) which is also inclined to the axis of the grid body (3031), wherein the second diaphragm (3032 b) and the first diaphragm (3032 a) are connected with each other, and the inclination directions of the second diaphragm and the first diaphragm are opposite.

8. The medical device according to claim 5, wherein at least one side of the housing (302) is provided with an air outlet grille (304), a second air-through gap on the air outlet grille (304) is communicated with the inner cavity of the housing (302), and the extending direction of the second air-through gap is inclined to the extending direction of the particle rays.

9. The medical device of claim 5, wherein the air outlet shielding structure (30) further comprises a blower (305), the blower (305) being disposed within the housing (302), the blower (305) being configured to create a negative pressure in an interior cavity of the housing (302) to form the negative pressure cavity (301).

10. A medical device according to any one of claims 1-3, characterized in that the housing (10) comprises an interconnected shielding layer and a shielding layer, the shielding layer surrounding the shielding layer, the shielding layer being adapted to absorb radiation of particle rays.