Negative pressure drainage device

Abstract

The utility model relates to a negative pressure drainage device, including a sponge dressing, a drainage tube and a flushing tube; the sponge dressing includes at least two mutually connected dressing units, and two adjacent dressing units are intermittently connected so that the two adjacent dressing units can be separated from each other when subjected to a target tearing force, and one end of the dressing unit is designed as an arc structure; each dressing unit is equipped with a drainage tube and a flushing tube, and the drainage tube and the flushing tube both have a target length and are located inside the dressing unit, the drainage tube is used to draw out the liquid in the dressing unit, and the flushing tube is used to provide flushing liquid for the dressing unit. The utility model pre-sets a discontinuity line for the sponge dressing, which can be separated by gently pulling when in use, which can reduce sponge contamination, shorten the operation time, and improve the treatment effect; the arc-shaped structure design of the sponge dressing avoids secondary physical damage to body tissues.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a negative pressure drainage device. Background Art

[0002] Negative pressure wound therapy mainly utilizes the principle of negative pressure suction. A sponge is placed in the wound area of ​​the patient, and a surgical film is used to seal the open wound. A certain negative pressure is generated by connecting to a negative pressure source, and the drainage tube and sponge act on the wound after debridement, thereby realizing negative pressure drainage therapy. Existing sponge devices are mostly block-shaped and integrated. When in use, clinicians need to temporarily cut the sponge dressing with scissors according to the size of the wound, which can easily cause the sponge to be contaminated, the cutting surface to be uneven, and there will be debris after cutting, which affects the treatment effect, and will also cause cost waste, prolonged operation time and other problems. In addition, the right-angled edges of the block-shaped and integrated sponge may cause the tension to be concentrated at the edge, which in turn leads to local traction and damage of the tissue, increases the tension of the wound, is not conducive to healing, and is likely to cause secondary physical damage to the body tissue. Utility Model Content

[0003] The technical problem to be solved by the utility model is that the sponge dressing in the prior art needs to be temporarily cut, which causes sponge pollution, uneven cutting surface, debris after cutting that affects the treatment effect, wastes costs, prolongs the operation time, and the right-angle edges of the existing sponge dressing are prone to cause secondary physical damage to the body.

[0004] In order to solve the problems existing in the prior art, a negative pressure drainage device is disclosed, the device comprising:

[0005] Sponge dressing, drainage tube and flushing tube; the sponge dressing comprises at least two mutually connected dressing units, two adjacent dressing units are intermittently connected so that the two adjacent dressing units can be separated from each other when subjected to a target tearing force, and one end of the dressing unit is designed as an arc structure; each dressing unit is configured with a drainage tube and a flushing tube, and the drainage tube and the flushing tube both have a target length and are located inside the dressing unit, the drainage tube is used to drain the liquid in the dressing unit, and the flushing tube is used to provide flushing liquid for the dressing unit.

[0006] In an implementable scheme, the sponge dressing is in a block shape, wherein the drainage tube and the flushing tube are inserted into the interior of the dressing unit from one side of the dressing unit, and the side of the dressing unit away from the drainage tube and the flushing tube is designed as an arc structure, and the arc structure is an intermittent arc.

[0007] In one practicable embodiment, the target length of the flushing tube in the dressing unit is located in the drainage tube.

[0008] In another feasible solution, a portion of the length of the flushing tube and the drainage tube is in the dressing unit, and the flushing tube and the drainage tube are arranged in parallel in the dressing unit.

[0009] In one feasible solution, the discontinuous line of discontinuous connection between two adjacent dressing units is arranged along the drainage direction of the drainage tube.

[0010] Furthermore, the flushing tube is at least partially sleeved in the drainage tube, and another portion of the flushing tube protrudes from the outside of the drainage tube.

[0011] In an implementable solution, the flushing tube includes two parts, a first tube body and a second tube body. The first tube body is arranged outside the drainage tube and outside the sponge dressing, and the second tube body is arranged inside the drainage tube. One end of the first tube body is connected to a flushing tube joint, and the flushing liquid introduced by the flushing tube joint can flow through the first tube body and enter the second tube body.

[0012] In another feasible scheme, the flushing tube includes three parts: a first tube body, a second tube body and a third tube body. The first tube body and the third tube body are arranged outside the drainage tube, the second tube body is arranged inside the drainage tube, one end of the first tube body is connected to the flushing tube joint, the second tube body is located between the first tube bodies, and the third tube body is located in the sponge dressing.

[0013] In another feasible scheme, the flushing tube includes four parts, namely a first tube body, a second tube body, a third tube body and a fourth tube body, which are connected in sequence. The first tube body and the third tube body are both located in the drainage tube, the second tube body and the fourth tube body both protrude from the outside of the drainage tube, the first tube body and the second tube body are located in the sponge dressing, the second tube body is a straight tube, and the third tube body is a curved structure.

[0014] Furthermore, the drainage tube is provided with a drainage hole on its tube body in the dressing unit, and the flushing tube is provided with a flushing hole on its tube body in the dressing unit.

[0015] Furthermore, a flushing pipe cap is provided on the flushing pipe joint.

[0016] The negative pressure drainage device of this scheme includes a sponge dressing, a drainage tube and a flushing tube; the sponge dressing includes at least two dressing units connected to each other, and two adjacent dressing units are intermittently connected so that the two adjacent dressing units can be separated from each other when subjected to a target tearing force, and one end of the sponge unit is designed as an arc structure; each dressing unit is equipped with a drainage tube and an flushing tube, and the drainage tube and the flushing tube both have a target length and are located inside the dressing unit, the drainage tube is used to draw out the liquid in the dressing unit, and the flushing tube is used to provide flushing liquid for the dressing unit. The utility model pre-sets discontinuity lines on the sponge dressing, which can be separated by gently pulling when in use, solving the problems of uneven cut surface, a lot of cutting debris and easy contamination of the sponge dressing caused by cutting during surgery in the prior art. The technical scheme can reduce sponge contamination, shorten the operation time and improve the treatment effect; the arc-shaped structure design of the sponge dressing avoids secondary physical damage to the body tissue. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0018] Figure 1 This is a three-dimensional structural diagram of the negative pressure drainage device described in the utility model.

[0019] Figure 2 yes Figure 1 A schematic plan view of the negative pressure drainage device at an angle;

[0020] Figure 3 yes Figure 2 Sectional view along line A-A;

[0021] Figure 4 yes Figure 1 A schematic plan view of the negative pressure drainage device from another angle;

[0022] Figure 5 yes Figure 4 Sectional view along line BB;

[0023] Figure 6 yes Figure 1 A plan view of the negative pressure drainage device from another angle;

[0024] Figure 7 It is another three-dimensional structural schematic diagram of the negative pressure drainage device described in the utility model;

[0025] Figure 8 yes Figure 7 A schematic plan view of the negative pressure drainage device at an angle;

[0026] Fig. 9 yes Figure 8 Sectional view along line CC;

[0027] Fig.10 yes Figure 7 A plan view of the negative pressure drainage device from another angle;

[0028] Fig.11 It is a schematic diagram of the relationship between the drainage tube and the flushing tube described in the utility model;

[0029] Fig.12 This is another schematic diagram of the relationship between the drainage tube and the flushing tube described in the utility model;

[0030] Fig.13 This is another schematic diagram of the relationship between the drainage tube and the flushing tube described in the utility model;

[0031] Fig.14 This is another schematic diagram of the relationship between the drainage tube and the flushing tube described in the utility model;

[0032] In the figure: 1-sponge dressing, 11-dressing unit, 2-drainage tube, 3-flushing tube, 4-flushing tube joint, 31-first tube body, 32-second tube body, 33-third tube body, 34-fourth tube body, 41-flushing tube cap, 5-interrupted line, 6-arc structure. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0034] The term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "inner", "lower", etc. is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more at least two of the features. Moreover, the terms "first", "second", etc. are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here.

[0035] In order to solve the problems existing in the prior art, the present application provides a negative pressure drainage device. Specifically, Figures 1 to 10 As shown, the negative pressure drainage device includes a sponge dressing 1, a drainage tube 2 and a flushing tube 3; the sponge dressing 1 includes at least two dressing units 11 connected to each other, and two adjacent dressing units 11 are intermittently connected so that the two adjacent dressing units 11 are separated from each other when subjected to a target tearing force, and each dressing unit 11 is equipped with a drainage tube 2 and a flushing tube 3, and the drainage tube 2 and the flushing tube 3 both have a target length located inside the dressing unit 11, and the drainage tube 2 is used to drain the liquid in the dressing unit 11, and the flushing tube 3 is used to provide flushing liquid for the dressing unit 11. Among them, the target length can refer to the length of the drainage tube 2 and / or the flushing tube 3 inserted into the dressing unit 11 at 2 / 3 or 3 / 4, etc. The specific length can be set based on actual needs and is not specifically limited here.

[0036] Specifically, the target tearing force refers to the target force that can tear two adjacent dressing units 11 apart. In actual applications, the target tearing force is relatively small, and medical staff can completely separate the two dressing units 11 by tearing them apart by hand.

[0037] By cutting the sponge dressing 1 in advance, a discontinuity line 5 is formed between two adjacent dressing units 11. When the doctor uses it, there is no need to cut it, but only to pull it lightly to separate it. No debris is generated after tearing it apart, which shortens the operation time and reduces sponge contamination. In addition, the doctor can choose whether to use it as a whole or separately based on the wound area, which reduces costs and improves treatment effects.

[0038] In an practicable solution, the sponge dressing 1 is in a block shape, wherein the drainage tube 2 and the flushing tube 3 are both inserted into the interior of the dressing unit from one side of the dressing unit 11, and the side of the dressing unit 11 away from the drainage tube 2 and the flushing tube 3 is designed as an arc structure 6, and the arc structure (6) is an intermittent arc. By designing the sponge dressing 1 with an arc structure, the pressure concentration of the sponge dressing 1 on the tissue can be reduced, the stimulation and traction on the wound surface can be reduced, which helps to improve the drainage effect and promote wound healing, and can prevent the body tissue from being subjected to secondary physical damage. Furthermore, by designing the arc structure as an intermittent arc, the dressing unit 11 can be easily torn off and used separately.

[0039] In an practicable solution, the discontinuous line 5 connecting two adjacent dressing units 11 is arranged along the drainage direction of the drainage tube. It can be understood that the drainage direction of the drainage tube refers to the direction of drainage from the dressing unit 11 to the outside. Figure 1 , Figure 3 as well as Figure 4 Further, in another feasible solution, the discontinuity line 5 can also be arranged along the vertical direction of the drainage direction.

[0040] It is understandable that the above two directions are only a preferred embodiment. In practical applications, as long as the intermittent connection between two adjacent dressing units 11 can be achieved, there is no specific limitation on the direction of the discontinuity line 5. Figure 3 As shown, the flushing tube 3 includes three parts: a first tube body 31, a second tube body 32 and a third tube body 33. The first tube body 31 and the third tube body 33 are arranged outside the drainage tube 2, and the second tube body 32 is inside the drainage tube 2. The first tube body 31 is located outside the sponge dressing 1, one end of the first tube body 31 is connected to the flushing tube joint 4, the second tube body 32 is located between the first tube body 31 and the third tube body 33, and the third tube body 33 is located in the sponge dressing 1; in essence, the first tube body 31, the second tube body 32 and the third tube body 33 can be an integrally formed through tube, which are only distinguished in different positional relationships.

[0041] Further, in an practicable solution, the flushing tube 3 is sleeved inside the drainage tube 2, and a portion of the flushing tube 3 located in the dressing unit 11 is also located in the drainage tube 2. Fig. 9As shown, the flushing tube 3 includes two parts, a first tube body 31 and a second tube body 32. The first tube body 31 is arranged outside the drainage tube 2 and outside 1 of the sponge dressing, and the second tube body 32 is arranged inside the drainage tube 2. One end of the first tube body 31 is connected to the flushing tube joint 4. A portion of the length of the second tube body 32 is arranged inside the drainage tube 2. The flushing liquid introduced by the flushing tube joint 4 can flow through the first tube body 31 and enter the second tube body 32. It can be understood that shrinking a portion of the length of the flushing tube 3 located in the dressing unit 11 into the drainage tube 2 can enable the flushing tube 3 to flush the end of the drainage tube 2, thereby improving the flushing effect of the drainage tube 2; in fact, the first tube body 31 and the second tube body 32 can be an integrally formed through tube, which is only distinguished in different positional relationships.

[0042] Specifically, the sponge dressing 1 may be used as a whole, or only one auxiliary material unit may be used, depending on the wound area.

[0043] In one feasible approach, when a patient needs to use Figures 7 to 10 The larger single sponge dressing 1 shown in the figure is used clinically. First, the wound surface of the patient is thoroughly cleaned, and the negative pressure drainage device is directly selected for overall use. The sponge dressing 1 is placed on the clean wound surface, covered with a biological transparent adhesive film, and one end of the drainage tube 2 is connected to the corresponding interface on the drainage bag or drainage tank of the hospital's negative pressure drainage device. The negative pressure drainage device is turned on for drainage. During the drainage process, when the wound surface needs to be flushed and cleaned, the negative pressure drainage device is closed, the flushing tube cap 41 is opened, and the flushing liquid is injected with a syringe. The flushing liquid enters the sponge dressing 1 through the flushing tube 3 to achieve the flushing effect. It can be understood that the flushing liquid here can be physiological saline, antibacterial solution or other medical liquids. After flushing, the flushing tube cap 41 is closed, and the negative pressure drainage device switch is turned on again to perform drainage treatment. Furthermore, the drainage tube 2 is provided with a drainage hole on its tube body in the dressing unit 11, and the flushing tube 3 is provided with a flushing hole on its tube body in the dressing unit 11. The liquid accumulated in the dressing unit 11 can flow into the drainage tube 2 through the drainage hole, and then be sucked away by the connected drainage bag or drainage tank, and the flushing liquid enters the dressing unit 11 through the flushing hole on the flushing tube 3. By providing the drainage hole, the collection area of ​​the liquid to be drained can be increased and the collection speed can be improved. By providing the flushing hole, the synchronous flushing of the drainage tube 2 can be achieved.

[0044] Further, in one embodiment, Figures 1 to 6There are two dressing units 11 and two drainage tubes 2, which can provide a larger drainage area around the wound, thereby increasing the efficiency of liquid drainage. It can be understood that the number of dressing units 11 is not limited to the two in the above example. In actual applications, the number of dressing units 11 used can be determined based on the wound area to achieve overall coverage of the wound area.

[0045] Furthermore, the flushing pipe cap 41 plays a sealing role when the flushing function is not used, and can effectively prevent external bacteria, dust, dirt and other substances from entering the flushing pipe interface.

[0046] In another feasible scheme, when the patient needs to use a smaller and thinner sponge dressing, in clinical use, first thoroughly clean the patient's wound surface, then through a small amount of connection at a local position of the sponge part, gently tear the negative pressure drainage sponge device into two sets, place one set of sponge dressing 1 on the clean wound surface, cover it with a biological transparent adhesive film, turn on the negative pressure drainage device for drainage, and the liquid flows into the drainage tube 2 through the drainage hole, and then is sucked away by the connected drainage bag or drainage can. During the drainage process, when the wound surface needs to be flushed and cleaned, close the negative pressure drainage device, open the flushing tube cap 41, and inject the flushing liquid with a syringe. The flushing liquid enters the dressing unit 11 through the flushing hole to achieve the flushing effect. After flushing, close the flushing tube cap 41, turn on the negative pressure drainage device switch again, and perform drainage treatment.

[0047] Preferably, in the above two embodiments, the drainage holes and the flushing holes can both be circular holes, which can effectively guide the flow of liquid and ensure a smooth drainage process and flushing process.

[0048] It is understandable that the drainage holes and flushing holes may also be other holes such as elliptical holes, cross-shaped holes, etc., which can allow liquid to pass quickly and prevent liquid accumulation.

[0049] Preferably, in the above two embodiments, the sponge dressing 1 is a polyethylene sponge, which has good water absorption and air permeability, can quickly absorb a large amount of liquid, and allows air circulation around the wound, which helps to effectively remove wound exudate, blood or other secretions, helps to supply oxygen to the wound surface and maintain a moist environment, and promotes wound healing.

[0050] It is understandable that the sponge dressing 1 can also be a polyvinyl alcohol sponge, a polyurethane sponge, a polypropylene sponge or the like having the same effect as the polyvinyl alcohol sponge.

[0051] Furthermore, the connection between the drainage tube 2 and the flushing tube 3 and the sponge dressing 1 is detachable, so as to facilitate classification and recycling after use.

[0052] Furthermore, the relationship between the drainage tube 2 and the flushing tube 3 described above is only a preferred embodiment. In other embodiments, the flushing tube 3 is at least partially sleeved in the drainage tube 2, and another portion of the flushing tube 3 protrudes from the outside of the drainage tube 2. In one example, Fig.11 As shown, the flushing tube 3 may include a first tube body 31, a second tube body 32, a third tube body 33 and a fourth tube body 34 connected in sequence, the first tube body 31 and the third tube body 33 are both located in the drainage tube 2, and the second tube body 32 and the fourth tube body 34 are both protruding from the outside of the drainage tube 2. In this example, the second tube body 32 is located in the sponge dressing 1, and a plurality of flushing holes are provided on the second tube body 32. It can be understood that by protruding the second tube body 32 located in the sponge dressing 1 from the outside of the drainage tube 2 and providing a plurality of flushing holes on the second tube body 32, the flushing liquid can be contacted with the sponge dressing 1 at multiple holes, thereby increasing the contact area between the flushing liquid and the sponge dressing 1 and improving the flushing effect of the sponge dressing 1. Further, in this example, the fourth tube body 34 extends out of the sponge dressing 1. The end of the fourth tube body 34 protruding from the drainage tube 2 is connected to a flushing tube connector 4, and a flushing tube cap 41 is provided on the flushing tube connector 4. It is understandable that the flushing hole on the second tube body 32 is only a preferred embodiment. In other feasible embodiments, multiple flushing holes can also be opened on the first tube body 31. By opening the flushing holes on the first tube body 31, the drainage tube 2 can be cleaned together, reducing the infection of the wound caused by the convergence of the liquid in the drainage tube 2, thereby improving the healing effect. Furthermore, the flushing tube cap 41 plays a sealing role when the flushing function is not used, which can effectively prevent external bacteria, dust, dirt and other substances from entering the flushing tube interface.

[0053] It can be understood that the flushing tube 3 is divided into four sections and is arranged between the flushing tube 3 and the drainage tube 2 as follows: Fig.11 The position relationship shown is only a preferred implementation. In other feasible solutions, it can also be as follows Fig.12 As shown, the flushing tube 3 is divided into four sections, and at this time, the end of the first tube body 31 extends out of the end of the drainage tube 2.

[0054] Furthermore, in other feasible solutions, the flushing pipe 3 may also be divided into: Fig.13 The first tube body 31 and the second tube body 32 are shown. At this time, the first tube body 31 is located in the sponge dressing 1, and the first tube body 31 is located in the drainage tube 2, and the end of the first tube body 31 is retracted at the end of the drainage tube 2. Alternatively, it can be as follows Fig.14 In the structure shown, the end of the first tube body 31 extends out of the end of the drainage tube 2.

[0055] It can be understood that the above examples are all illustrative examples in which the flushing tube 3 is at least partially sleeved on the drainage tube 2. In actual applications, the flushing tube 3 can also be spaced apart from the drainage tube 2.

[0056] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0057] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A negative pressure drainage device, characterized in that: The device comprises: A sponge dressing (1), a drainage tube (2) and a flushing tube (3); the sponge dressing (1) comprises at least two mutually connected dressing units (11), and two adjacent dressing units (11) are intermittently connected so that the two adjacent dressing units (11) are separated from each other when subjected to a target tearing force; each dressing unit (11) is provided with a drainage tube (2) and a flushing tube (3), and the drainage tube (2) and the flushing tube (3) both have a target length and are located inside the dressing unit (11); the drainage tube (2) is used to drain the liquid in the dressing unit (11), and the flushing tube (3) is used to provide flushing liquid for the dressing unit (11).

2. The negative pressure drainage device according to claim 1, characterized in that: The sponge dressing (1) is in a block shape, wherein the drainage tube (2) and the flushing tube (3) are both inserted into the interior of the dressing unit (11) from one side of the dressing unit (11), and the side of the dressing unit (11) away from the drainage tube (2) and the flushing tube (3) is designed as an arc-shaped structure (6), and the arc-shaped structure (6) is an intermittent arc.

3. The negative pressure drainage device according to claim 1, characterized in that: The target length of the flushing tube (3) in the dressing unit (11) is located in the drainage tube (2).

4. The negative pressure drainage device according to claim 1, characterized in that: Part of the length of the flushing tube (3) and the drainage tube (2) is within the dressing unit (11), and the two are arranged side by side in the dressing unit (11).

5. The negative pressure drainage device according to claim 1, characterized in that: The discontinuous line (5) connecting two adjacent dressing units (11) is arranged along the drainage direction of the drainage tube.

6. The negative pressure drainage device according to claim 1, characterized in that: The flushing tube (3) is at least partially sleeved in the drainage tube (2), and another portion of the flushing tube (3) protrudes from the outside of the drainage tube (2).

7. The negative pressure drainage device according to claim 3, characterized in that: The flushing tube (3) comprises two parts, a first tube body (31) and a second tube body (32); the first tube body (31) is arranged outside the drainage tube (2) and outside the sponge dressing (1); the second tube body (32) is arranged inside the drainage tube (2); one end of the first tube body (31) is connected to a flushing tube joint (4); flushing liquid introduced by the flushing tube joint (4) can flow through the first tube body (31) and enter the second tube body (32).

8. The negative pressure drainage device according to claim 7, characterized in that: The flushing tube (3) comprises three parts, namely a first tube body (31), a second tube body (32) and a third tube body (33); the first tube body (31) and the third tube body (33) are arranged outside the drainage tube (2), and the second tube body (32) is arranged inside the drainage tube (2); one end of the first tube body (31) is connected to the flushing tube joint (4), the second tube body (32) is located between the first tube bodies (31), and the third tube body (33) is located in the sponge dressing (1).

9. The negative pressure drainage device according to claim 6, characterized in that: The flushing tube (3) comprises four parts, namely a first tube body (31), a second tube body (32), a third tube body (33) and a fourth tube body (34) which are connected in sequence; the first tube body (31) and the third tube body (33) are both located in the drainage tube (2); the second tube body (32) and the fourth tube body (34) are both protruding from the outside of the drainage tube (2); the first tube body (31) and the second tube body (32) are located in the sponge dressing (1); the second tube body (32) is a straight tube; and the third tube body (33) is a curved structure.

10. The negative pressure drainage device according to claim 4, 7 or 8, characterized in that: The drainage tube (2) is arranged in the dressing unit (11) and is also provided with a drainage hole on its tube body, and the flushing tube (3) is arranged in the dressing unit and is also provided with a flushing hole on its tube body.

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