Negative pressure dosing chamber
By employing a central and side air supply design and multi-layer filter plates in the negative pressure drug delivery chamber, the problems of poor ventilation and insufficient cleanliness in existing technologies are solved, achieving uniform air distribution and preventing cross-contamination of drugs, thus improving the safety of the drug delivery chamber.
Patent Information
- Application Number
- CN202423151354.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2034-12-20
AI Technical Summary
The existing negative pressure drug delivery chamber has a concentrated air inlet, resulting in poor ventilation. After long-term use, impurities accumulate on the inner wall of the air supply duct, reducing cleanliness and safety.
The air supply design, which combines a central slot and side slots, ensures that air enters the dosing chamber evenly. The air is filtered through multiple layers of filter plates and activated carbon plates. Combined with the negative pressure components and exhaust port design, a unidirectional airflow is formed to avoid cross-infection.
It improves ventilation and cleanliness, prevents cross-contamination of drugs, and enhances the safety of the drug administration room.
Smart Images
Figure CN223647488U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of negative pressure drug delivery chamber technology, and in particular to a negative pressure drug delivery chamber. Background Technology
[0002] When conducting pharmacokinetic or bioequivalence studies on new inhaled drugs, a certain number of subjects need to be administered the medication. Preventing cross-infection in the administration environment is crucial, especially when handling potentially infectious drugs or treatments, where strict infection control measures must be implemented. Negative pressure dosing rooms, by creating a negative pressure environment, can effectively prevent the leakage of drug-containing aerosols, thereby reducing the risk of cross-infection.
[0003] The working principle of a negative pressure drug administration chamber is mainly based on negative pressure technology. By using devices such as vacuum pumps and negative pressure generators, the air pressure inside the drug administration chamber is reduced, creating a negative pressure environment. At the same time, through air purification, temperature and humidity control, drug administration is carried out in a negative pressure environment, which can effectively prevent drug-containing aerosols from escaping outside the drug administration chamber, avoid cross-contamination to the next subject, and ensure the cleanliness and safety of the drug administration process.
[0004] In related technologies, the air inlets of negative pressure drug delivery chambers are concentrated in one place, resulting in poor ventilation effect and efficiency. Moreover, although the air supply system filters the outside air before sending it into the drug delivery chamber, some impurities adhere to the inner wall of the air supply duct after long-term use. Directly passing through the filter screen at the air inlet into the drug delivery chamber will reduce the cleanliness and safety of the drug delivery chamber. Utility Model Content
[0005] One objective of this invention is to provide a negative pressure drug delivery chamber that allows air to enter the chamber evenly and flow in one direction, thereby improving ventilation while preventing cross-infection of the subjects and enhancing the cleanliness and safety of the delivery chamber.
[0006] The negative pressure drug delivery chamber provided in this application adopts the following technical solution:
[0007] The negative pressure drug delivery chamber of this embodiment includes:
[0008] The administration room is equipped with an operating bed for the subject to rest and a nebulizer for administering the drug, with the nebulizer located next to the operating bed.
[0009] A negative pressure assembly includes a negative pressure generator and an exhaust pipe. An exhaust port is provided at the bottom of the side wall of the drug delivery chamber, and a filter plate is provided at the exhaust port. The filter plate is fixed to the side wall of the drug delivery chamber by a fixing assembly. An exhaust channel communicating with the exhaust port is provided inside the side wall of the drug delivery chamber. One end of the exhaust pipe is connected to the exhaust channel, and the other end of the exhaust pipe is connected to the air inlet of the negative pressure generator. The air outlet of the negative pressure generator is connected to the outside atmosphere through an air outlet pipe.
[0010] An air supply assembly includes an air pump and an air supply pipe. An air inlet is provided on the top wall of the drug delivery chamber. The air inlet includes a central slot and side slots surrounding the central slot. A second filter plate is installed at the central slot, and a third filter plate is installed at each of the side slots. Activated carbon plates are installed inside both the second and third filter plates. The second and third filter plates are fixed to the top wall of the drug delivery chamber by a fixing component. An air intake channel communicating with the air inlet is provided inside the top wall of the drug delivery chamber. One end of the air supply pipe is connected to the air intake channel, and the other end of the air supply pipe is connected to the air outlet of the air pump via an air filter. The air inlet of the air pump is connected to the outside atmosphere via an air intake pipe.
[0011] Preferably, an observation room is provided next to the drug administration room. A door slot and an observation window are provided on the wall between the observation room and the drug administration room. A door body is rotatably provided at the door slot. A door slot is provided on the side of the observation room near the corridor. A door body is rotatably provided at the door slot. An exhaust grille is provided at the bottom of the door body. The negative pressure machine, air pump, and air filter are all provided in the observation room.
[0012] Preferably, the fixing component one includes a fixing edge and fixing bolts. The fixing edge is integrally formed in the circumference of the filter plate one. A fixing ring groove is provided at the exhaust port for the fixing edge to be engaged. The fixing bolts are located at the four corners of the fixing edge. The fixing bolts pass through the fixing edge and are threadedly connected to the fixing ring grooves.
[0013] Preferably, the fixing component two includes a fixing plate one and a fixing bolt two. The fixing plate one is slidably disposed at both ends of the filter plate two along its length. Each end of the filter plate two along its length corresponds to two fixing plates one. The two fixing plates one at each end of the filter plate two along its width slide toward each other or toward each other. The side wall of the filter plate two is provided with a receiving groove one for the fixing plate one to slide. The bottom surface of the fixing plate one is connected to an operating rod one. The bottom surface of the filter plate two is provided with a sliding groove one for the operating rod one to slide. The inner side wall of the middle groove is provided with a fixing groove one for the fixing plate one to pass through. When the fixing plate one passes through the fixing groove one, the fixing bolt two passes through the top wall of the drug delivery chamber and the fixing plate one and is threadedly connected to the top wall of the drug delivery chamber.
[0014] Preferably, the fixing component three includes a fixing plate two and a fixing bolt three. The fixing plate two is slidably disposed at both ends of the filter plate three along its length. The side wall of the filter plate three is provided with a receiving groove two for the fixing plate two to slide. The bottom surface of the fixing plate two is connected to an operating rod two. The bottom surface of the filter plate three is provided with a sliding groove two for the operating rod two to slide. The inner side wall of the side groove is provided with a fixing groove two for the fixing plate two to pass through. When the fixing plate two passes through the fixing groove two, the fixing bolt three passes through the top wall of the drug delivery chamber and the fixing plate two and is threadedly connected to the top wall of the drug delivery chamber.
[0015] Preferably, the exhaust pipe includes a branch pipe, a converging pipe, and a gas supply pipe. Multiple branch pipes are provided and spaced apart along the length of the exhaust channel. The converging pipe is connected to multiple branch pipes simultaneously. One end of the gas supply pipe is connected to the middle of the converging pipe along its length, and the other end of the gas supply pipe extends into the observation chamber and is connected to the negative pressure pump.
[0016] Preferably, the air supply duct includes branch pipes, a manifold, and an air supply pipe. The branch pipes are distributed at the four corners and the middle of the air intake channel. The manifold connects all the branch pipes and the air supply pipe. The other end of the air supply pipe extends into the observation chamber and connects to the air filter.
[0017] Preferably, a lighting lamp is installed on the inner ceiling wall of the drug administration chamber, and a lighting lamp is installed on the inner ceiling wall of the observation chamber.
[0018] Preferably, the drug administration room is equipped with an air purifier.
[0019] Preferably, the observation room is equipped with hooks, on which a recording sheet is hung, and the recording sheet is used to record various indicators of the subject.
[0020] In summary, this application includes the following beneficial technical effects:
[0021] According to the negative pressure drug delivery chamber of this utility model embodiment, the air enters the drug delivery chamber evenly through the cooperation of the middle slot and the side slot, improving the ventilation effect and efficiency. Since there is only one exhaust port, the airflow in the drug delivery chamber flows from top to bottom in one direction, which improves the ventilation effect while avoiding cross-infection of drugs to the subjects. The activated carbon plates in filter plate one and filter plate two further adsorb and filter the gas entering the drug delivery chamber, improving the cleanliness and safety of the drug delivery chamber.
[0022] Other features and advantages of the present invention will become clear from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. Attached Figure Description
[0023] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present invention and, together with their description, serve to explain the principles of the present invention.
[0024] Figure 1 This is a schematic diagram of the overall structure of a negative pressure drug delivery chamber in an embodiment of this application.
[0025] Figure 2 This is a structural schematic diagram used in the embodiments of this application to illustrate the negative pressure component and the air supply component.
[0026] Figure 3 This is a cross-sectional structural diagram of the negative pressure drug delivery chamber used in the embodiments of this application.
[0027] Figure 4 This is a structural schematic diagram used to illustrate fixing component one and fixing component two in the embodiments of this application.
[0028] Figure label:
[0029] 1. Drug administration room; 11. Operating bed; 12. Nebulizer; 13. Lighting lamp 1; 14. Air purifier; 15. Observation window 2; 2. Observation room; 21. Door 1; 22. Observation window 1; 24. Door 2; 241. Exhaust grille; 25. Lighting lamp 2; 26. Hook; 27. Record sheet; 28. Control panel; 29. Air filter; 3. Negative pressure assembly; 31. Negative pressure unit; 32. Exhaust pipe; 321. Diverter pipe; 322. Merging pipe; 323. Gas supply pipe; 4. Air supply assembly; 41. Air pump; 42. Air supply pipe; 421. Branch pipe; 422. Manifold; 423. Gas supply pipe; 5. Exhaust port; 5 1. Filter plate one; 52. Exhaust channel; 53. Air outlet pipe; 6. Fixing component one; 61. Fixing edge; 62. Fixing bolt; 63. Fixing ring groove; 7. Air inlet; 71. Middle groove; 71. Filter plate two; 72. Side groove; 72. Filter plate three; 73. Air inlet channel; 74. Air inlet pipe; 8. Fixing component two; 81. Fixing plate one; 82. Fixing bolt two; 83. Receiving groove one; 84. Operating lever one; 85. Slide groove one; 86. Fixing groove one; 9. Fixing component three; 91. Fixing plate two; 92. Fixing bolt three; 93. Receiving groove two; 94. Operating lever two; 95. Slide groove two; 96. Fixing groove two. Detailed Implementation
[0030] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values of the components and steps set forth in these embodiments do not limit the scope of the present invention.
[0031] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.
[0032] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.
[0033] In all the examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.
[0034] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.
[0035] In the specification and claims of this utility model, the terms "first" and "second" may explicitly or implicitly include one or more of those features. In the description of this utility model, unless otherwise stated, "multiple" means two or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.
[0036] In the description of this 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" and other terms indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0037] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0038] The negative pressure drug delivery chamber according to an embodiment of the present invention will now be described in detail with reference to the accompanying drawings.
[0039] Reference Figure 1-4 The negative pressure drug delivery room includes a drug delivery room 1, an observation room 2, a negative pressure component 3, and an air supply component 4.
[0040] The administration room 1 is equipped with an operating bed 11 for the subject to rest and two nebulizers 12 for administering medication. If one nebulizer 12 fails, the other can be used. The nebulizers 12 are located next to the operating bed 11. A lighting lamp 13 is installed on the inner ceiling wall of the administration room 1. An air purifier 14 is also installed in the administration room 1.
[0041] Observation room 2 is located next to administration room 1. A door slot 1 and an observation window 22 are provided on the wall between observation room 2 and administration room 1. A door body 21 is rotatably mounted on the door slot 1. A second door slot 2 is provided on the side of observation room 2 closest to the corridor. A second door body 24 is rotatably mounted on the second door slot 2. An exhaust grille 241 is provided at the bottom of the second door body 24. A second lighting lamp 25 is installed on the inner ceiling wall of observation room 2. An observation window 15 is provided on the wall of administration room 1 closest to the corridor. Both observation windows 22 and 15 are transparent.
[0042] The observation room 2 is equipped with a hook 26, on which a record sheet 27 is hung. The record sheet 27 is used to record various indicators of the subjects.
[0043] A control panel 28 is installed on the wall between the observation room 2 and the drug administration room 1. The control panel 28 can control the opening and closing of the nebulizer 12, the first lighting lamp 13, the second lighting lamp 25, and the air purifier 14.
[0044] The negative pressure assembly 3 includes a negative pressure unit 31 and an exhaust pipe 32. An exhaust port 5 is provided at the bottom of the side wall of the drug administration chamber 1. A filter plate 51 is provided at the exhaust port 5. An exhaust channel 52 communicating with the exhaust port 5 is provided inside the side wall of the drug administration chamber 1. One end of the exhaust pipe 32 is connected to the exhaust channel 52, and the other end of the exhaust pipe 32 is connected to the air inlet of the negative pressure unit 31. The air outlet of the negative pressure unit 31 is connected to the outside atmosphere through an air outlet pipe 53.
[0045] The exhaust pipe 32 includes a branch pipe 321, a converging pipe 322, and a gas supply pipe 323. Multiple branch pipes 321 are provided and spaced apart along the length of the exhaust channel 52. The converging pipe 322 is connected to multiple branch pipes 321. One end of the gas supply pipe 323 is connected to the middle of the converging pipe 322 along its length, and the other end of the gas supply pipe 323 extends into the observation chamber 2 and is connected to the negative pressure pump. Exhaust is carried out simultaneously through multiple branch pipes 321 to improve exhaust efficiency.
[0046] The filter plate 51 is detachably fixed to the side wall of the drug delivery chamber 1 by the fixing assembly 6. The fixing assembly 6 includes a fixing edge 61 and fixing bolts 62. The fixing edge 61 is integrally formed in the circumference of the filter plate 51. A fixing ring groove 63 is provided at the exhaust port 5 for the fixing edge 61 to be engaged. The fixing bolts 62 are located at the four corners of the fixing edge 61. After passing through the fixing edge 61, the fixing bolts 62 are threadedly connected to the fixing ring grooves 63.
[0047] The air supply assembly 4 includes an air pump 41 and an air supply pipe 42. An air inlet 7 is provided on the top wall of the drug administration chamber 1. The air inlet 7 includes a central slot 71 and side slots 72 surrounding the central slot 71. A second filter plate 711 is provided at the central slot 71, and a third filter plate 721 is provided at the side slots 72. Activated carbon plates are provided in both the second filter plate 711 and the third filter plate 721 to further adsorb and filter the gas entering the drug administration chamber 1, thereby improving the cleanliness and safety of the drug administration chamber 1.
[0048] An air inlet channel 73 connected to the air inlet 7 is provided in the top wall of the drug delivery chamber 1. One end of the air supply pipe 42 is connected to the air inlet channel 73, and the other end of the air supply pipe 42 is connected to the air outlet of the air pump 41 through the air filter 16. The air inlet of the air pump 41 is connected to the outside atmosphere through the air inlet pipe 74.
[0049] The negative pressure unit 31, air pump 41, and air filter 16 are all located in the observation room 2. The control panel 28 can also control the opening and closing of the negative pressure unit 31, air pump 41, and air filter 16.
[0050] The air supply duct 42 includes branch pipes 421, a manifold 422, and an air supply pipe 423. The branch pipes 421 are distributed at the four corners and the middle of the air intake channel 73. The manifold 422 connects all the branch pipes 421 and the air supply pipe 423. The other end of the air supply pipe 423 extends into the observation chamber 2 and connects to the air filter 16. Simultaneous air intake through multiple branch pipes 421 improves the efficiency and uniformity of air intake.
[0051] The combination of the central slot 71 and the side slot 72 allows air to enter the drug administration chamber 1 evenly, improving the ventilation effect and efficiency. Since there is only one exhaust port 5, the airflow in the drug administration chamber 1 flows from top to bottom in one direction, which improves the ventilation effect while avoiding cross-infection of drugs in the subjects.
[0052] The filter plate 711 is fixed to the top wall of the drug delivery chamber 1 by the fixing component 8. The fixing component 2 8 includes a fixing plate 1 81 and a fixing bolt 2 62. The fixing plate 1 81 is slidably disposed at both ends of the filter plate 2 711 along its length. Each end of the filter plate 2 711 corresponds to two fixing plates 1 81. The two fixing plates 1 81 at each end of the filter plate 2 711 slide towards each other or away from each other along the width direction of the filter plate 2 711. The side wall of the filter plate 2 711 is provided with a receiving groove 1 83 for the fixing plate 1 81 to slide. The bottom surface of the fixing plate 1 81 is connected to an operating rod 1 84. The bottom surface of the filter plate 2 711 is provided with a sliding groove 1 85 for the operating rod 1 84 to slide. The inner side wall of the middle groove 71 is provided with a fixing groove 1 86 for the fixing plate 1 81 to pass through. When the fixing plate 1 81 passes through the fixing groove 1 86, the fixing bolt 2 62 passes through the top wall of the drug administration chamber 1 and the fixing plate 1 81 and is threadedly connected to the top wall of the drug administration chamber 1.
[0053] The filter plate 721 is fixed to the top wall of the drug administration chamber 1 by the fixing component 9. The fixing component 9 includes a fixing plate 91 and fixing bolts 62. The fixing plate 91 is slidably disposed at both ends of the filter plate 721 along its length. The side wall of the filter plate 721 has a receiving groove 93 for the fixing plate 91 to slide. The bottom surface of the fixing plate 91 is connected to an operating rod 94. The bottom surface of the filter plate 721 has a sliding groove 95 for the operating rod 94 to slide. The inner side wall of the side groove 72 has a fixing groove 96 for the fixing plate 91 to pass through. When the fixing plate 91 is inserted into the fixing groove 96, the fixing bolts 62 penetrate the top wall of the drug administration chamber 1 and the fixing plate 91 and are threadedly connected to the top wall of the drug administration chamber 1.
[0054] After a period of time, filter plate 1 (51), filter plate 2 (711), and filter plate 3 (721) are disassembled and replaced to ensure the cleanliness of the drug administration chamber 1.
[0055] The implementation principle of a negative pressure drug delivery chamber in this application embodiment is as follows:
[0056] First, the air pump 41 and the negative pressure pump work together to ventilate the inside of the administration chamber 1. Then, the subject sits / lies on the operating bed 11. Then, the negative pressure pump is turned on by the control panel 28 to create a negative pressure state in the administration chamber 1. Then, the nebulizer 12 administers the drug. During this period, the air purifier is kept on. Medical staff can observe the subject's condition in the observation room 2 and record it on the record sheet 27.
[0057] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A negative pressure drug delivery chamber, characterized in that, include: The administration room (1) is equipped with an operating bed (11) for the subject to rest and a nebulizer (12) for administering the drug. The nebulizer (12) is located next to the operating bed (11). The negative pressure assembly (3) includes a negative pressure machine (31) and an exhaust pipe (32). An exhaust port (5) is provided at the bottom of the side wall of the drug administration chamber (1). A filter plate (51) is provided at the exhaust port (5). The filter plate (51) is fixed to the side wall of the drug administration chamber (1) by a fixing assembly (6). An exhaust channel (52) communicating with the exhaust port (5) is provided in the side wall of the drug administration chamber (1). One end of the exhaust pipe (32) is connected to the exhaust channel (52). The other end of the exhaust pipe (32) is connected to the air inlet of the negative pressure machine (31). The air outlet of the negative pressure machine (31) is connected to the outside atmosphere through an air outlet pipe (53). An air supply assembly (4) is provided, comprising an air pump (41) and an air supply pipe (42). An air inlet (7) is provided on the top wall of the drug delivery chamber (1). The air inlet (7) comprises a central slot (71) and side slots (72) surrounding the central slot (71). A filter plate two (711) is provided at the central slot (71), and a filter plate three (721) is provided at the side slots (72). Activated carbon plates are provided inside both the filter plate two (711) and the filter plate three (721). The filter plate (721) is fixed to the top wall of the administration chamber (1) by fixing component 2 (8), and the filter plate (721) is fixed to the top wall of the administration chamber (1) by fixing component 3 (9); the top wall of the administration chamber (1) is provided with an air inlet channel (73) that communicates with the air inlet (7), one end of the air supply pipe (42) is connected to the air inlet channel (73), the other end of the air supply pipe (42) is connected to the air outlet of the air pump (41) through the air filter (29), and the air inlet of the air pump (41) is connected to the outside atmosphere through the air inlet pipe (74).
2. The negative pressure drug delivery chamber according to claim 1, characterized in that: An observation room (2) is provided next to the administration room (1). A door slot and an observation window (22) are provided on the wall between the observation room (2) and the administration room (1). A door body (21) is rotatably provided at the door slot. A door slot (2) is provided on the side of the observation room (2) near the corridor. A door body (24) is rotatably provided at the door slot. An exhaust grille (241) is provided at the bottom of the door body (24). The negative pressure machine (31), the air pump (41), and the air filter (29) are all located in the observation room (2).
3. The negative pressure drug delivery chamber according to claim 1, characterized in that: The fixing component 1 (6) includes a fixing edge (61) and a fixing bolt (62). The fixing edge (61) is integrally formed on the circumference of the filter plate 1 (51). A fixing ring groove (63) is provided at the exhaust port (5) for the fixing edge (61) to be engaged. The fixing bolt (62) is located at the four corners of the fixing edge (61). The fixing bolt (62) passes through the fixing edge (61) and is threadedly connected to the fixing ring groove (63).
4. The negative pressure drug delivery chamber according to claim 1, characterized in that: The fixing component two (8) includes a fixing plate one (81) and two fixing bolts (62). The fixing plate one (81) is slidably disposed at both ends of the filter plate two (711) along its length. Each end of the filter plate two (711) along its length corresponds to two fixing plates one (81). The two fixing plates one (81) at each end of the filter plate two (711) along its width slide toward each other or toward each other. The side wall of the filter plate two (711) is provided with a sliding surface for the fixing plates one (81). The receiving groove (83) is connected to the bottom surface of the fixing plate (81), and the bottom surface of the filter plate (711) is provided with a sliding groove (85) for the operating rod (84) to slide. The inner side wall of the middle groove (71) is provided with a fixing groove (86) for the fixing plate (81) to pass through. When the fixing plate (81) is inserted into the fixing groove (86), the fixing bolt (62) 2 is inserted into the top wall of the drug delivery chamber (1) and the fixing plate (81) and is threadedly connected to the top wall of the drug delivery chamber (1).
5. The negative pressure drug delivery chamber according to claim 1, characterized in that: The fixing component three (9) includes a fixing plate two (91) and a fixing bolt three (62). The fixing plate two (91) is slidably disposed at both ends of the filter plate three (721) along its length. The side wall of the filter plate three (721) is provided with a receiving groove two (93) for the fixing plate two (91) to slide. The bottom surface of the fixing plate two (91) is connected to an operating rod two (94). The bottom surface of the filter plate three (721) is provided with a sliding groove two (95) for the operating rod two (94) to slide. The inner side wall of the side groove (72) is provided with a fixing groove two (96) for the fixing plate two (91) to pass through. When the fixing plate two (91) is inserted into the fixing groove two (96), the fixing bolt three (62) passes through the top wall of the drug delivery chamber (1) and the fixing plate two (91) and is threadedly connected to the top wall of the drug delivery chamber (1).
6. The negative pressure drug delivery chamber according to claim 2, characterized in that: The exhaust pipe (32) includes a branch pipe (321), a converging pipe (322), and a gas supply pipe (323). Multiple branch pipes (321) are provided and are spaced apart along the length of the exhaust channel (52). The converging pipe (322) is connected to multiple branch pipes (321) at the same time. One end of the gas supply pipe (323) is connected to the middle part of the converging pipe (322) along its length, and the other end of the gas supply pipe (323) extends into the observation chamber (2) and is connected to the negative pressure pump.
7. The negative pressure drug delivery chamber according to claim 2, characterized in that: The air supply pipe (42) includes branch pipes (421), a manifold (422), and an air supply pipe (423). The branch pipes (421) are distributed at the four corners and the middle of the air intake channel (73). The manifold (422) connects all the branch pipes (421) and the air supply pipe (423). The other end of the air supply pipe (423) extends into the observation room (2) and connects to the air filter (29).
8. The negative pressure drug delivery chamber according to claim 2, characterized in that: The inner top wall of the drug administration chamber (1) is equipped with a lighting lamp (13), and the inner top wall of the observation chamber (2) is equipped with a lighting lamp (25).
9. The negative pressure drug delivery chamber according to claim 1, characterized in that: An air purifier (14) is installed in the drug administration room (1).
10. The negative pressure drug delivery chamber according to claim 2, characterized in that: The observation room (2) is equipped with a hook (26), on which a record sheet (27) is hung. The record sheet (27) is used to record various indicators of the subjects.