Medical negative pressure instrument

Abstract

The utility model provides a medical negative pressure instrument. The medical negative pressure instrument comprises a main body; the dissolving bin is detachably mounted on the main body, and a liquid inlet and an air extraction opening are formed in the dissolving bin; the negative pressure generation assembly is arranged on the main body and is communicated with the air extraction opening; at least part of the liquid level alarm assembly is arranged in the dissolving bin, and the liquid level alarm assembly is in signal connection with the negative pressure generation assembly; and the prompting assembly is arranged on the main body and is in signal connection with the liquid level alarm assembly. Compared with the prior art, according to the medical negative pressure instrument, the liquid level of the dissolving bin is judged through the liquid level alarm assembly, a user can be prompted to clean after the dissolving bin reaches the specified liquid level, use is convenient, the overall structural design is ingenious, the dissolving bin is convenient to disassemble and assemble, and user experience is good.

Description

Technical Field

[0001] This utility model relates to the field of medical technology, specifically to a medical negative pressure device. Background Technology

[0002] Currently, in wound treatment, preventing infection and promoting blood circulation to the wound site to accelerate healing are the primary goals for medical staff. However, some wounds that are too large, caused by chronic diseases, or severely infected are difficult to heal quickly through traditional debridement treatments. In these types of wounds, local blood circulation is obstructed, resulting in insufficient blood flow to the wound site. This leads to a lack of oxygen and nutrients in the surrounding tissues, and insufficient immune capacity to resist wound infection caused by microorganisms. This can easily lead to sepsis, damage to the immune system, or prolonged wound healing. These phenomena have become things that must be avoided as much as possible in clinical wound care.

[0003] Clinical studies in the United States over the past decade have shown that negative pressure wound therapy (NPWT) devices have excellent healing effects on various acute and chronic wounds. NPWT devices are used to suction out tissue exudate from the wound, thereby eliminating local obstruction, ensuring local blood circulation, and guaranteeing the delivery of oxygen and nutrients to the wound site. This can accelerate wound healing and improve the body's immunity against infection.

[0004] Negative pressure wound therapy devices include the device itself, a wound dressing kit, and a container for collecting exudate from the wound. Currently, the containers for collecting exudate in these devices tend to overflow when full, causing contamination of the surrounding environment. Therefore, users need to constantly monitor the container's level, making it somewhat inconvenient to use. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and provide a medical negative pressure device.

[0006] One embodiment of this utility model provides a medical negative pressure device, comprising:

[0007] main body;

[0008] A dissolving chamber is detachably mounted on the main body, and the dissolving chamber is provided with a liquid inlet and an air extraction port;

[0009] A negative pressure generating component is disposed on the main body and communicates with the air extraction port;

[0010] A liquid level alarm component, at least a portion of which is disposed within the melting chamber, is signal-connected to the negative pressure generating component;

[0011] A prompting component is disposed on the main body and is signal-connected to the liquid level alarm component. Compared with the prior art, the medical negative pressure device of this utility model uses the liquid level alarm component to determine the liquid level of the dissolution chamber. When the dissolution chamber reaches the specified liquid level, it can prompt the user to clean it. It is convenient to use, has an ingenious overall structural design, and the dissolution chamber is also easy to disassemble and assemble, resulting in a better user experience.

[0012] In some optional embodiments, the liquid level alarm component includes an electrical contact and two conductive elements. The electrical contact is disposed on the main body and is signal-connected to the negative pressure generating component and the indication component. The two conductive elements are disposed on the melting chamber, with portions of the conductive elements extending into the melting chamber. When the melting chamber is installed on the main body, the electrical contact is electrically connected to the conductive elements.

[0013] In some optional embodiments, the melting chamber is provided with a first chamber and a second chamber, which are interconnected by an overflow port. The liquid inlet is located in the first chamber, and the air extraction port and the liquid level alarm component are located in the second chamber. The bottom horizontal height of the air extraction port and the bottom horizontal height of the liquid level alarm component are not lower than the bottom horizontal height of the overflow port.

[0014] In some alternative embodiments, the second cavity is provided with a blocking portion arranged around the air extraction port and the liquid level alarm component, wherein the bottom of the blocking portion is not higher than the bottom of the overflow port.

[0015] In some optional embodiments, a baffle plate is provided in the second cavity, the blocking part is arranged around the baffle plate, the baffle plate is located below the air extraction port and the liquid level alarm component, and the baffle plate is provided with a through hole;

[0016] In the projection direction from top to bottom, the through hole does not overlap with the air extraction port and the liquid level alarm component.

[0017] In some optional embodiments, the melting chamber is provided with a first limiting groove and a second limiting groove, the first limiting groove and the second limiting groove being located on different sides of the melting chamber, and the main body is provided with a fixed fastener and a movable fastener, the fixed fastener being limited and engaged with the first limiting groove, and the movable fastener being limited and engaged with the second limiting groove.

[0018] In some alternative embodiments, a sliding groove is provided on the outer side of the main body, the movable fastener is movably disposed within the main body, the movable fastener is provided with a sliding operating part, the sliding operating part extends into the sliding groove and slides in cooperation with the sliding groove.

[0019] In some alternative embodiments, the main body is provided with a plurality of protruding curved support portions, the curved support portions extending along the guide direction of the slide groove, and the curved support portions abutting against the side of the movable fastener away from the slide groove.

[0020] In some optional embodiments, the melting chamber is provided with a positioning boss, the first limiting groove and the second limiting groove are provided on different sides of the positioning boss, the main body is provided with a positioning groove, the fixed fastener and the movable fastener are arranged in the positioning groove, and the positioning boss and the positioning groove are positioned and engaged.

[0021] In some optional embodiments, the movable fastener is provided with a protruding positioning part, and the second limiting groove is provided with a positioning recess. When the movable fastener is limited and engaged with the second limiting groove, the positioning part and the positioning recess are positioned and engaged.

[0022] Compared with existing technologies, the medical negative pressure device of this invention uses a liquid level alarm component to determine the liquid level of the dissolution chamber. When the dissolution chamber reaches the specified liquid level, it can prompt the user to clean it. It is easy to use, has an ingenious overall structural design, and the dissolution chamber is also easy to disassemble and assemble, resulting in a better user experience.

[0023] To provide a clearer understanding of this invention, the specific embodiments of this invention will be described below in conjunction with the accompanying drawings. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of a medical negative pressure device and catheter according to one embodiment of the present invention;

[0025] Figure 2 This is a cross-sectional view of a medical negative pressure device and catheter according to an embodiment of the present invention;

[0026] Figure 3 for Figure 2 The enlarged view at point A is shown below;

[0027] Figure 4 This is a cross-sectional view of a medical negative pressure device and catheter according to an embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the main body of one embodiment of the present utility model;

[0029] Figure 6 This is a schematic diagram of the structure of the melting chamber according to an embodiment of the present invention;

[0030] Figure 7 This is an exploded view of the main body of one embodiment of the present invention.

[0031] Explanation of reference numerals in the attached figures:

[0032] 10. Main body; 12. Fixed fastener; 13. Movable fastener; 131. Sliding operating part; 132. Positioning part; 14. Slide groove; 15. Curved surface support part; 16. Positioning groove; 17. Clearance hole; 20. Dissolving chamber; 21. Liquid inlet; 22. Air extraction port; 23. First chamber; 24. Second chamber; 241. Overflow port; 242. Blocking part; 243. Liquid baffle; 244. Through hole; 25. First limiting groove; 26. Second limiting groove; 261. Positioning recess; 27. Positioning boss; 28. Dissolving chamber cover; 29. ​​Dissolving chamber shell; 30. Negative pressure generating component; 40. Liquid level alarm component; 41. Electrical connection component; 42. Conductive component; 50. Indication component; 60. Conduit. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model. In the description of the present utility model, unless otherwise stated, "a plurality of" means two or more, and "a number" means one or more. In addition, unless otherwise stated, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features.

[0034] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this utility model.

[0035] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0036] In the description of this utility model, references to terms such as "one embodiment," "some alternative implementations," or "some optional embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0037] Please see Figure 1 and Figure 2 One embodiment of this utility model provides a medical negative pressure device, including: a main body 10, a dissolving chamber 20, a negative pressure generating component 30, a liquid level alarm component 40, and a prompting component 50;

[0038] The dissolution chamber 20 is detachably installed on the main body 10. The dissolution chamber 20 is provided with a liquid inlet 21 and an air extraction port 22. The dissolution chamber 20 can contain wound exudate or other liquids. In this embodiment, wound exudate is used as an example for explanation.

[0039] The negative pressure generating component 30 is installed on the main body 10 and is connected to the air extraction port 22. The negative pressure generating component 30 extracts the gas in the melting chamber 20, thereby creating a negative pressure environment in the melting chamber 20.

[0040] At least a portion of the liquid level alarm component 40 is disposed within the melting chamber 20, and the liquid level alarm component 40 is signal-connected to the negative pressure generating component 30;

[0041] The indicator component 50 is disposed on the main body 10 and is signal-connected to the liquid level alarm component 40.

[0042] In use, the conduit 60 is connected to the inlet 21, and the conduit 60 is connected to the wound. Then, the negative pressure generating component 30 generates negative pressure, causing the dissolution chamber 20 and the wound to form a negative pressure environment. As the exudate from the wound continuously enters the dissolution chamber 20, when the exudate reaches a suitable level and triggers the level alarm component 40, the level alarm component 40 issues an alarm signal. The prompt component 50 issues a prompt signal after receiving the alarm signal. The prompt signal can be a light signal and / or a sound signal and / or a vibration signal. The negative pressure generating component 30 stops operating after receiving the alarm signal.

[0043] In this embodiment, the indicator component 50 is an indicator light component, which is exposed from one side of the main body 10, thereby emitting indicator light from one side of the main body 10.

[0044] It should be noted that as the liquid inside the dissolution chamber 20 increases and the sealing of the dissolution chamber 20 is compromised, the negative pressure inside the dissolution chamber 20 will change continuously. The negative pressure environment at the wound site changes with the internal negative pressure of the dissolution chamber 20. Therefore, the negative pressure environment of the dissolution chamber 20 can be adjusted in real time by the negative pressure generating component 30, so that the pressure values ​​at the wound site and inside the dissolution chamber 20 are maintained at an appropriate level.

[0045] The specific structure of the negative pressure generating component 30 can be selected according to actual needs. For example, the negative pressure generating component 30 can be an air pump, etc., and this example is not limited.

[0046] Please see Figure 3 and Figure 4 In some optional embodiments, the liquid level alarm component 40 includes a contact 41 and two conductive elements 42. The contact 41 is disposed on the main body 10 and is signal-connected to the negative pressure generating component 30 and the indication component 50. The two conductive elements 42 are disposed on the dissolution chamber 20, with portions of the conductive elements 42 extending into the dissolution chamber 20. When the dissolution chamber 20 is installed on the main body 10, the contact 41 and the conductive elements 42 are electrically connected. When the liquid level in the dissolution chamber 20 reaches a specified height, the wound exudate comes into contact with the two conductive elements 42, causing the two conductive elements 42 to conduct. The contact 41 can be a connector, while the conductive elements 42 adopt a connection structure corresponding to the connector, enabling the conductive elements 42 and the connector to achieve electrical connection. In this embodiment, the power receiving component 41 is provided with two power receiving parts, and the main body 10 is also provided with a circuit board. The circuit board is electrically connected to the two power receiving parts. When the circuit board continuously sends the above-mentioned electrical signal to one of the power receiving parts, when the circuit board receives the above-mentioned electrical signal, it indicates that the wound exudate has come into contact with the two conductive parts 42, indicating that the liquid level has reached the specified height. Then the circuit board can send an alarm signal to the negative pressure generating component 30 and the prompting component 50. Of course, the circuit board can also be electrically connected to one of the power receiving parts and then continuously send an alarm signal to the cover power receiving part, while the other power receiving part is signal connected to the prompting component 50 and the negative pressure generating component 30. When the wound exudate comes into contact with the two conductive parts 42, the alarm signal can be transmitted sequentially through one power receiving part, one conductive part 42, wound exudate, another conductive part 42 and another power receiving part, and then transmitted to the prompting component and the negative pressure generating component 30. This example is not limited to this one.

[0047] The conductive component 42 can be a flexible electrical terminal. When the flexible electrical terminal comes into contact with the electrical component 41, it undergoes elastic deformation. The elastic force of the flexible electrical terminal makes the flexible electrical terminal stably contact the electrical component 41, thereby improving the electrical connection stability.

[0048] Because the negative pressure near the suction port 22 is relatively high, wound exudate can easily be drawn into the suction port 22. Therefore, in some optional embodiments, the dissolution chamber 20 is provided with a first chamber 23 and a second chamber 24, which are interconnected by an overflow port 241. The liquid inlet 21 is located in the first chamber 23, and the suction port 22 and the liquid level alarm component 40 are located in the second chamber 24. The bottom level of both the suction port 22 and the liquid level alarm component 40 is not lower than the bottom level of the overflow port 241. When the dissolution chamber 20 begins to collect wound exudate, the wound exudate first enters the first chamber 23 and does not enter the second chamber 24, allowing the wound exudate to accumulate in the first chamber 23. The second chamber 24 serves as a transition and pressure equalization mechanism. This helps to prevent the wound exudate from rapidly approaching the suction port 22 and being drawn into the negative pressure generating component 30, which could cause blockage of the negative pressure generating component 30. After the wound exudate in the first chamber 23 reaches the overflow port 241, the wound exudate will flow from the overflow port 241 to the bottom of the first chamber 23. Then, during the rise of the liquid level in the first chamber 23, the second chamber 24 can still be connected to the first chamber 23 through the overflow port 241. Therefore, the second chamber 24 can still play the role of transition and pressure equalization. The wound exudate still enters the first chamber 23 first and then slowly falls from the overflow port 241, effectively avoiding the splashing of wound exudate in the first chamber 23 and the second chamber 24.

[0049] In some optional embodiments, the second chamber 24 is provided with a blocking part 242 arranged around the air extraction port 22 and the liquid level alarm component 40. The bottom of the blocking part 242 is not higher than the bottom of the overflow port 241, so the wound exudate flowing down from the overflow port 241 is not easily drawn quickly to the air extraction port 22. Moreover, when the liquid level in the second chamber 24 is higher than the blocking part 242, the wound exudate seals the bottom of the blocking part 242, preventing the air extraction port 22 from communicating with the space outside the blocking part 242 in the second chamber 24. This causes the wound exudate in the blocking part 242 to rise relatively quickly and reach the designated height corresponding to the liquid level alarm component 40, thereby causing the negative pressure generating component 30 to stop drawing negative pressure and avoiding the situation where the liquid level in the first chamber 23 and the second chamber 24 is too high.

[0050] In some optional embodiments, a baffle plate 243 is provided in the second cavity 24, and a blocking part 242 is arranged around the baffle plate 243. The baffle plate 243 is located below the air extraction port 22 and the liquid level alarm component 40, and a through hole 244 is provided on the baffle plate 243. In the projection direction from top to bottom, the through hole 244 does not overlap with the air extraction port 22 and the liquid level alarm component 40. The baffle plate 243 can prevent wound exudate from splashing and falling directly onto the air extraction port 22 and the liquid level alarm component 40, so that some wound exudate mixed with gas when the negative pressure generating component 30 is evacuating will fall onto the baffle plate 243 first when it approaches the air extraction port 22.

[0051] Please see Figure 5 and Figure 6 The detachable connection between the melting chamber 20 and the main body 10 can be designed according to actual needs. For example, the melting chamber 20 can be detachably connected to the main body 10 through a snap-fit ​​structure, a threaded structure, a pin structure, an adhesive structure, etc. In this embodiment, the melting chamber 20 is provided with a first limiting groove 25 and a second limiting groove 26, which are located on different sides of the melting chamber 20. The main body 10 is provided with a fixed fastener 12 and a movable fastener 13. The fixed fastener 12 is engaged with the first limiting groove 25, and the movable fastener 13 is engaged with the second limiting groove 26. During installation, first, the fixed fastener 12 is engaged with the first limiting groove 25. Then, the melting chamber 20 is moved to a suitable installation position. Next, the movable fastener 13 is moved so that it engages with the second limiting groove 26, thereby locking the melting chamber 20 onto the main body 10. This operation is convenient and the melting chamber 20 can be fixed stably. During disassembly, the movable fastener 13 is disengaged from the second limiting groove 26, and then the melting chamber 20 is moved so that the first limiting groove 25 is separated from the fixed fastener 12, thus achieving the disassembly of the melting chamber 20.

[0052] In some optional embodiments, a sliding groove 14 is provided on the outer side of the main body 10, and a movable fastener 13 is movably disposed within the main body 10. A sliding operating part 131 is provided on the movable fastener 13, which extends into the sliding groove 14 and slides in cooperation with the sliding groove 14. The user can push the sliding operating part 131 to make the movable fastener 13 achieve a limiting cooperation with the second limiting groove 26, or push the sliding operating part 131 to drive the movable fastener 13 away from the second limiting groove 26, thereby releasing the limiting cooperation between the movable fastener 13 and the second limiting groove 26. The operation is convenient and makes the appearance of the main body 10 more beautiful and simple.

[0053] Please see Figure 7Users typically press on the sliding operation part 131 and then push it. In order to reduce the friction between the sliding operation part 131 and the main body 10, in some optional embodiments, the main body 10 is provided with a plurality of protruding curved support parts 15. The curved support parts 15 extend along the guide direction of the slide groove 14 and abut against the side of the movable fastener 13 away from the slide groove 14. When the user presses the movable fastener 13 against the curved support part 15, since the contact between the curved surface of the curved support part 15 and the movable fastener 13 is a line contact, it is beneficial to reduce the contact area between the curved support part 15 and the movable fastener 13, thereby reducing the friction of the movable fastener 13 sliding.

[0054] To improve the installation stability of the melting chamber 20, in some optional embodiments, the melting chamber 20 is provided with a positioning boss 27, a first limiting groove 25 and a second limiting groove 26 are provided on different sides of the positioning boss 27, and the main body 10 is provided with a positioning groove 16. A fixed fastener 12 and a movable fastener 13 are arranged in the positioning groove 16. The positioning boss 27 extends into the positioning groove 16 and then engages with it. The fixed fastener 12 and the movable fastener restrict the positioning boss 27 within the positioning groove 16, thereby stably fixing the melting chamber 20 to the main body 10. In this embodiment, the positioning groove 16 is provided with a clearance hole 17 for the conductive component 42 to pass through. The conductive component 42 is provided on the positioning boss 27. After the positioning boss 27 extends into the positioning groove 16, the conductive component 42 passes through the clearance hole 17 and extends into the main body 10, abutting against the contact component 41 provided within the main body 10.

[0055] In some optional embodiments, the movable fastener 13 is provided with a protruding positioning part 132, and the second limiting groove 26 is provided with a positioning recess 261. When the movable fastener 13 is engaged with the second limiting groove 26, the positioning part 132 and the positioning recess 261 are engaged, so that the movable fastener 13 is positioned in the second limiting groove 26 and is not easily displaced, thus preventing the movable fastener 13 from coming loose from the second limiting groove 26 and enabling the movable fastener 13 to stably engage with the second limiting groove 26. Of course, in other embodiments, the movable fastener 13 can also be interference-fitted with the second limiting groove 26, so that the movable fastener 13 is not easily released from the second limiting groove 26, and this is not a limitation.

[0056] To facilitate the cleaning of the liquid in the dissolving chamber 20, in some optional embodiments, the dissolving chamber 20 includes a dissolving chamber cover 28 and a dissolving chamber shell 29 that are detachably connected to each other. The dissolving chamber cover 28 is used to close the dissolving chamber shell 29. An air extraction port 22 and a liquid level alarm component 40 are provided on the dissolving chamber cover 28, and a liquid inlet 21 is provided on the dissolving chamber shell 29. A first cavity 23 and a second cavity 24 are formed between the dissolving chamber cover 28 and the dissolving chamber shell 29.

[0057] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A medical negative pressure apparatus, characterized by, include: main body; A dissolving chamber is detachably mounted on the main body, and the dissolving chamber is provided with a liquid inlet and an air extraction port; A negative pressure generating component is disposed on the main body and communicates with the air extraction port; A liquid level alarm component, at least a portion of which is disposed within the melting chamber, is signal-connected to the negative pressure generating component; A prompting component is disposed on the main body and is signal-connected to the liquid level alarm component.

2. The medical negative pressure device of claim 1, wherein: The liquid level alarm component includes an electrical contact and two conductive components. The electrical contact is disposed on the main body and is signal-connected to the negative pressure generating component and the prompting component. The two conductive components are disposed on the melting chamber, with portions of the conductive components extending into the melting chamber. When the melting chamber is installed on the main body, the electrical contact is electrically connected to the conductive components.

3. The medical negative pressure device of claim 1, wherein: The melting chamber is provided with a first chamber and a second chamber, which are connected to each other through an overflow port. The liquid inlet is located in the first chamber, and the air extraction port and the liquid level alarm component are located in the second chamber. The bottom horizontal height of the air extraction port and the bottom horizontal height of the liquid level alarm component are not lower than the bottom horizontal height of the overflow port.

4. The medical negative pressure device of claim 3, wherein: The second cavity is provided with a blocking part arranged around the air extraction port and the liquid level alarm component, and the bottom of the blocking part is not higher than the bottom of the overflow port.

5. The medical negative pressure device of claim 4, wherein: A liquid baffle is provided in the second cavity, and the blocking part is arranged around the liquid baffle. The liquid baffle is located below the air extraction port and the liquid level alarm component. The liquid baffle is provided with a through hole. In the projection direction from top to bottom, the through hole does not overlap with the air extraction port and the liquid level alarm component.

6. The medical negative pressure device of any one of claims 1 to 5, wherein: The melting chamber is provided with a first limiting groove and a second limiting groove, which are located on different sides of the melting chamber. The main body is provided with a fixed fastener and a movable fastener, which are limited by the first limiting groove and the movable fastener are limited by the second limiting groove.

7. The medical negative pressure device of claim 6, wherein: A sliding groove is provided on the outer side of the main body, and the movable fastener is movably disposed within the main body. The movable fastener is provided with a sliding operating part, which extends into the sliding groove and slides in cooperation with the sliding groove.

8. The medical negative pressure device of claim 7, wherein: The main body is provided with several protruding curved support parts, which extend along the guide direction of the slide groove and abut against the side of the movable fastener away from the slide groove.

9. The medical negative pressure device of claim 6, wherein: The melting chamber is provided with a positioning boss, the first limiting groove and the second limiting groove are provided on different sides of the positioning boss, the main body is provided with a positioning groove, the fixed fastener and the movable fastener are arranged in the positioning groove, and the positioning boss and the positioning groove are positioned and engaged.

10. The medical negative pressure device of claim 6, wherein: The movable fastener is provided with a protruding positioning part, and the second limiting groove is provided with a positioning recess. When the movable fastener is limited and engaged with the second limiting groove, the positioning part and the positioning recess are positioned and engaged.

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