Simple negative pressure drainage device

Abstract

The simple negative pressure drainage device comprises a negative pressure assembly, a dredging assembly and a drainage tube which are sequentially connected, the negative pressure assembly comprises a first tube body and a pull rod which is in sealed sliding connection with the first tube body, and a connecting tube is arranged at the end, facing the drainage tube, of the first tube body; a positioning part for keeping the pull rod in a pull-out state is arranged on the first pipe body; the dredging assembly comprises a second pipe body, a rotating rod is rotationally arranged in the second pipe body, the rotating rod rotates around the center axis of the second pipe body, and a plurality of cutting blades are fixedly arranged at the end, close to the drainage pipe, of the rotating rod; a power part for driving the rotating rod to rotate is arranged on the second pipe body; the second tube body is fixedly connected with the connecting tube in a sleeved mode, and the second tube body is fixedly connected with the drainage tube in a sleeved mode. According to the utility model, blood clots or tissue fragments blocked in the drainage tube can be minced, so that the normal drainage speed is ensured; the drainage device is suitable for drainage of wounds with small hydrops such as body surface abscess or mammary gland abscess and the like.

Description

Technical Field

[0001] The utility model relates to a drainage device, in particular to a simple negative pressure drainage device. Background Art

[0002] Clinically, drainage is often used after surgery to drain pus, blood and other fluids accumulated in the wound to the outside of the body, thereby reducing local pressure, reducing infection factors and promoting healing. The traditional drainage structure includes a drainage tube and a negative pressure drainage bag, in which one end of the drainage tube is left inside the patient's wound, and the other end is sealed with a negative pressure drainage bag. The drainage bag is placed below the wound. Under the action of the negative pressure suction of the drainage bag, the accumulated fluid in the wound will be drained into the drainage bag through the drainage tube. This structure is more applicable to wounds with large amounts of fluid accumulation (such as body cavity effusion), but it will cause a waste of resources for wounds with small amounts of fluid accumulation such as surface abscesses or breast abscesses, and after the drainage bag and drainage tube are placed, the patient will also have difficulties in getting out of bed.

[0003] The utility model patent with publication number CN210992063U discloses a simple negative pressure aspirator for medical measurement, including a syringe, which includes a barrel, a piston and a push rod installed in the barrel. The push rod can be pulled forward and backward in the barrel. The front end of the barrel has a liquid inlet interface for connecting a drainage tube. When the push rod is pulled backward, the barrel is in a negative pressure state, which can generate suction for the effusion in the wound. A telescopic rod that moves synchronously with the push rod is provided on the outside of the barrel. The telescopic rod also has a positioning function. The push rod can be fixed by the telescopic rod after being pulled out, so that the syringe is always in a negative pressure state, avoiding the push rod from retreating and causing the drained liquid to flow back and cause infection. The structure is simple and compact, suitable for wounds with small effusions, and does not affect the patient's activities on the ground.

[0004] However, when the above patent is used, blood clots or tissue fragments in the wound may be sucked into the drainage tube and may become blocked. Under the action of negative pressure, the blood clots or tissue fragments move to a certain extent, but the movement is slow, causing the drainage speed to also become slow. Utility Model Content

[0005] In order to solve the above deficiencies in the prior art, the utility model aims to provide a simple negative pressure drainage device to timely clear blood clots or tissue fragments and ensure a normal drainage speed.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0007] A simple negative pressure drainage device comprises a negative pressure component and a drainage tube. The negative pressure component comprises a first tube body and a pull rod arranged in the first tube body. The pull rod and the first tube body are sealed and slidably connected. The sliding direction of the pull rod is along the length direction of the first tube body. A connecting tube is arranged at one end of the first tube body facing the drainage tube. The drainage tube is fixedly sleeved on the connecting tube. A positioning portion for keeping the pull rod in a pulled-out state is arranged on the first tube body. A dredging component is arranged between the connecting tube and the drainage tube. The dredging component comprises a second tube body. A rotating rod is rotatably arranged in the second tube body. The rotating rod is arranged along the axial direction of the second tube body. The rotating rod rotates around the central axis of the second tube body. A plurality of cutting blades for breaking up blood clots are fixedly arranged at one end of the rotating rod close to the drainage tube. A power portion for driving the rotating rod to rotate is arranged on the second tube body. The second tube body and the connecting tube, as well as the second tube body and the drainage tube are all fixedly sleeved and connected.

[0008] As a limitation of the present utility model: a torsion portion is also provided in the second tube body, a fixed end of the torsion portion is fixedly connected to the second tube body, a free end of the torsion portion is fixedly connected to the rotating rod, and the free end of the torsion portion generates a rebound force after rotating with the rotating rod to help the rotating rod to rotate.

[0009] As a further limitation of the utility model: a rotating disk is rotatably arranged in the second tube body between the rotating rod and the torsion part, the radial direction of the rotating disk is arranged along the radial direction of the second tube body, the rotating rod is vertically fixed on the rotating disk, and the free end of the torsion part is fixedly connected to the rotating disk; a plurality of liquid holes are arranged on the rotating disk.

[0010] As a further definition of the utility model: the power part includes a pull rope on the edge of the rotating disk and wound along its circumference, and the free end of the pull rope extends out of the second tube body; a deformable member is arranged between the pull rope and the second tube body, and the deformable member and the second tube body, as well as the deformable member and the pull rope are all sealed and fixedly connected, and the deformable member protrudes toward the outside of the second tube body or returns toward the second tube body as the pull rope is pulled.

[0011] As a further definition of the utility model: the torsion part includes a fixed disk and a flat scroll spring, the radial direction of the flat scroll spring and the radial direction of the fixed disk are both arranged along the radial direction of the second tube body, the flat scroll spring is arranged close to the rotating disk, the fixed disk is fixed in the second tube body, the rotating disk and the fixed disk are rotatably connected, and a plurality of liquid holes are arranged on the fixed disk; a first bracket is fixed on the fixed disk, the fixed end of the flat scroll spring is hung with the first bracket, a second bracket is fixed on the rotating disk, and the free end of the flat scroll spring is hung with the second bracket.

[0012] As a further limitation of the present invention: the material of the deformable piece is rubber or leather.

[0013] As a further limitation of the present invention: a limit ring is provided on the inner wall of the second tube body corresponding to the position of the rotating disk, and the limit ring is provided with a groove for the outer edge of the rotating disk to extend into and adapted to the thickness of the rotating disk, and a gap is left between the outer edge of the rotating disk and the bottom of the groove.

[0014] As another limitation of the present invention: the positioning portion includes a groove arranged on the inner wall of the first tube body away from one end of the connecting tube, the opening of the groove is close to the pull rod, and a protrusion adapted to the groove is fixed on the outer diameter of the end of the pull rod extending into the tube body, a spring is arranged between the protrusion and the pull rod, the spring is in a compressed state, and the protrusion abuts against the inner wall of the first tube body.

[0015] As a further limitation of the present invention: a sealing ring is arranged between one end of the pull rod extending into the tube body and the inner wall of the first tube body, the sealing ring is sleeved on the outer diameter of the pull rod, and the sealing ring is in sealing contact with the inner wall of the first tube body.

[0016] As another limitation of the present invention: scale lines are arranged on the first tube along its length direction.

[0017] Due to the adoption of the above technical solution, the utility model has the following beneficial effects compared with the prior art:

[0018] (1) The utility model includes a negative pressure component, a dredging component and a drainage tube connected in sequence; when in use, the drainage tube is inserted into the wound, and the negative pressure component provides negative pressure suction to suck the accumulated fluid into the first tube body through the drainage tube and the dredging component to achieve drainage. When blood clots or tissue fragments are sucked into the drainage tube, the dredging component is used to crush them to avoid blocking the drainage tube and slowing down the drainage speed; the device is relatively small as a whole and is fixed to the body surface by medical tape, which will not hinder the patient's activities;

[0019] (2) The dredging assembly of the utility model comprises a second tube body and a rotating rod that rotates around the central axis of the second tube body. A plurality of cutting blades are fixed on the rotating rod. When the rotating rod rotates, the blood clots or tissue fragments can be crushed;

[0020] (3) The dredging assembly in the utility model also includes a torsion part, which includes a fixed disk and a plane scroll spring. The fixed disk is fixed in the second tube body and is fixedly connected to the fixed end of the plane scroll spring. The free end of the plane scroll spring is fixedly connected to the rotating rod. When the rotating rod rotates, the free end of the plane scroll spring rotates accordingly, thereby stretching and generating a rebound force. The rebound force can cause the rotating rod to rotate. After several positive and reverse rotations, the blood clots or tissue fragments are crushed, so that they can be sucked into the first tube body more quickly, thereby preventing them from being blocked in the drainage tube and causing a slow drainage speed.

[0021] (4) The power unit in the utility model can drive the rotating rod to rotate. The power unit includes a deformable member and a pull rope. When the pull rope is rotated, the deformable member protrudes toward the outside of the second tube body along with the pull rope. The rotating disk rotates to drive the rotating rod to rotate. When the pull rope is released, the rotating disk drives the rotating rod to reverse under the action of the rebound force generated by the planar scroll spring. The pull rope is retracted and the deformable member returns to the second tube body, thereby realizing the forward and reverse rotation of the rotating rod and improving the shredding efficiency.

[0022] In summary, the utility model can crush blood clots or tissue fragments blocked in the drainage tube, thereby ensuring a normal drainage speed; the utility model is suitable for draining wounds with a small amount of fluid accumulation, such as surface abscesses or breast abscesses. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention is described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0024] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;

[0025] Figure 2 It is a cross-sectional view of the negative pressure assembly in the embodiment of the utility model;

[0026] Figure 3 This is a schematic diagram of the structure of the dredging assembly in an embodiment of the utility model (the limiting ring is not shown);

[0027] Figure 4 It is a structural schematic diagram of the torsion part, the rotating disk and the rotating rod in the embodiment of the utility model;

[0028] Figure 5 for Figure 4 Exploded views of the components in the

[0029] Figure 6 This is a schematic diagram of the structure of the second tube body, the limiting ring and the rotating disk in the embodiment of the utility model;

[0030] Figure 7 It is a schematic diagram of the structure of the limiting ring in the embodiment of the utility model.

[0031] In the figure: 1-negative pressure assembly, 11-first tube body, 12-pull rod, 13-connecting tube, 14-groove, 15-bump, 16-spring, 17-sealing ring, 18-scale line;

[0032] 2-Drainage tube;

[0033] 3-dredging assembly, 301-second tube body, 302-rotating rod, 303-cutting blade, 304-rotating disk, 305-liquid hole, 306-pull rope, 307-deformation piece, 308-fixing disk, 309-flat volute spring, 310-connecting shaft, 311-first bracket, 312-second bracket, 313-limiting ring, 314-slot. DETAILED DESCRIPTION

[0034] The preferred embodiment of the utility model is described below in conjunction with the accompanying drawings. It should be understood that the simple negative pressure drainage device described here is a preferred embodiment, which is only used to illustrate and explain the utility model and does not constitute a limitation of the utility model.

[0035] The directional terms or positional relationships such as "front" and "rear" described in the embodiments are based on the drawings in the specification of the utility model. Figure 1 The orientation relationship is only for the convenience of describing the present invention and simplifying the description. It does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the content protected by the present invention.

[0036] The present embodiment is used to drain wounds with a small amount of fluid accumulation, such as surface abscesses or breast abscesses. In order not to hinder the patient's activities, the overall structure is relatively compact and can be fixed on the body surface with adhesive tape. In addition, when the patient is moving, if the drainage tube 2 is too long, it may swing. Therefore, the drainage tube 2 in the present structure is set shorter and fixed to a position close to the wound when in use.

[0037] like Figure 1 to Figure 7 As shown, this embodiment includes a negative pressure component 1, a dredging component 3 and a drainage tube 2 connected in sequence, and the negative pressure component 1 provides negative pressure suction to suck the accumulated fluid into the first tube body 11 through the drainage tube 2 and the dredging component 3. The dredging component 3 can crush blood clots or tissue fragments to avoid blocking the drainage tube 2 and slowing down the drainage speed.

[0038] 1. Negative pressure component 1

[0039] like Figure 1 , Figure 2 As shown, the negative pressure assembly 1 includes a first tube body 11, a pull rod 12, a positioning portion and a connecting tube 13;

[0040] The pull rod 12 is slidably disposed in the first tube body 11, and the sliding direction of the pull rod 12 is along the length direction of the first tube body 11, that is, the front and rear directions. A sealing ring 17 is sleeved on the outer diameter of the front end of the pull rod 12, and the sealing ring 17 is in sealing contact with the inner wall of the first tube body 11, so that the pull rod 12 and the inner wall of the first tube body 11 can be slidably connected in a sealed manner. In this embodiment, the sealing ring 17 is a rubber sealing ring, and can also be replaced with a polyurethane sealing ring.

[0041] The positioning part is to keep the first tube body 11 in a negative pressure state at all times. Specifically, the positioning part includes a groove 14 provided on the inner wall at the rear end of the first tube body 11, the opening of the groove 14 is provided close to the pull rod 12, a protrusion 15 is fixed on the outer diameter of the front end of the pull rod 12, a spring 16 is provided between the protrusion 15 and the pull rod 12, when the pull rod 12 is extended into the first tube body 11, the spring 16 is in a compressed state, the protrusion 15 is in contact with the inner wall of the first tube body 11, when the pull rod 12 is pulled backward until the protrusion 15 is extended into the groove 14, the pull rod 12 is fixed and cannot slide forward and backward, and since the drainage tube 2 at the front end is extended into the wound, the first tube body 11 is in a negative pressure state, and the accumulated fluid can be sucked into the first tube body 11. The positioning part is to keep the pull rod 12 in a pulled-out state at all times to prevent the accumulated fluid in the first tube body 11 from flowing back due to the withdrawal of the pull rod 12. In this embodiment, the positioning portion can also be replaced with any structure in the prior art, as long as it is ensured that the pull rod 12 does not retreat after being pulled out.

[0042] In this embodiment, the material of the first tube body 11 is transparent plastic, and glass can also be selected, as long as it is transparent and convenient for observing the drainage state of the effusion. The pull rod 12 and the connecting tube 13 are also made of plastic material.

[0043] In order to improve this embodiment, scale lines 18 are provided on the first tube body 11 along its length direction, so as to facilitate observation of the patient's daily drainage volume and timely recording.

[0044] The connecting pipe 13 is integrally arranged at the front end of the first pipe body 11 and is used for connecting the dredging component 3 .

[0045] 2. Dredging Component 3

[0046] like Figure 3-7 As shown, the dredging assembly 3 includes a second tube body 301, and a twisting portion, a rotating disk 304, and a rotating rod 302 arranged in the second tube body 301;

[0047] An internal thread is provided on the inner diameter of the rear end of the second tube body 301 for threaded connection with the connecting tube 13 , and the front end of the second tube body 301 is connected with the drainage tube 2 .

[0048] like Figure 3 As shown, the torsion portion includes a fixed disk 308 and a planar spiral spring 309; the radial directions of the planar spiral spring 309 and the fixed disk 308 are both arranged along the radial direction of the second tube body 301, and the fixed disk 308 is fixed in the second tube body 301. Specifically, in this embodiment, the diameter of the fixed disk 308 is slightly larger than the inner diameter of the second tube body 301, and the two are fixed by interference fit; Figure 4 As shown, a first bracket 311 is fixedly disposed on the fixed disk 308 , and a fixed end of the planar spiral spring 309 is hung on the first bracket 311 .

[0049] The rotating disk 304 is arranged parallel to the fixed disk 308. A rotating rod 302 is vertically fixed on the front side of the rotating disk 304. The axial direction of the rotating rod 302 is arranged along the axial direction of the second tube body 301. The rotating rod 302 extends from the second tube body 301 to the drainage tube 2. A plurality of cutting blades 303 for breaking up blood clots are fixed at the front end of the rotating rod 302. Figure 3 , Figure 6 The rotating disk 304 is rotatably connected to the fixed disk 308. Specifically, Figure 4 , Figure 5 As shown, a connecting shaft 310 is vertically fixed on the front side of the fixed disk 308, and the axial direction of the connecting shaft 310 is along the front and rear directions. The connecting shaft 310 passes through the center of the plane scroll spring 309 and is rotatably connected to the rotating disk 304. In this embodiment, a groove is provided on the rotating disk 304, and a bearing is fixed in the groove. The outer ring of the bearing is fixedly connected to the rotating disk 304, and the inner ring is fixedly connected to the connecting shaft 310. This structure can ensure that the rotating rod 302 and the rotating disk 304 rotate around the central axis of the second tube body 301. This setting method is a prior art and will not be repeated. Of course, any structure in the prior art that can realize the rotation connection between the rotating disk 304 and the connecting shaft 310 can also be adopted. A plurality of liquid holes 305 are provided on the fixed disk 308 and the rotating disk 304, so that the accumulated fluid and the crushed blood clots can be smoothly sucked into the first tube body 11. A second bracket 312 is fixed on the rear side of the rotating disk 304, and the free end of the plane scroll spring 309 is hung on the second bracket 312. In this embodiment, the second tube 301 , the fixed plate 308 , the rotating plate 304 and the rotating rod 302 can be made of plastic or metal.

[0050] The power unit is used to drive the rotating rod 302 to rotate. Figure 3 As shown, the power unit includes a pull rope 306 and a deformable member 307;

[0051] A groove is formed on the edge of the rotating disk 304, and the pull rope 306 is wound around the rotating disk 304 in the groove. Figure 3The drawstring wound on the middle rotating disk 304 is not shown. The free end of the drawstring 306 extends out of the second tube 301; a deformable member 307 is arranged between the drawstring 306 and the second tube 301, and the material of the deformable member 307 is selected from rubber or leather material. The deformable member 307 and the second tube 301, and the deformable member 307 and the drawstring 306 are all sealed and fixedly connected to prevent the leakage of the effusion. When the drawstring 306 is pulled, the deformable member 307 protrudes toward the outside of the second tube 301 along with the drawstring 306, and the rotating disk 304 drives the rotating rod 302 to rotate, and the free end of the plane scroll spring 309 rotates accordingly, thereby stretching and generating a rebound force; when the drawstring 306 is released, under the action of the rebound force, the rotating disk 304 drives the rotating rod 302 to reverse, the drawstring 306 is retracted, and the deformable member 307 returns to the second tube 301, thereby realizing the forward and reverse rotation of the rotating rod 302. After multiple operations, blood clots or tissue fragments can be minced. In this embodiment, the cutting blade 303 can be made of stainless steel or hard plastic material, and only needs to have a certain hardness and sharpness to be able to grind blood clots or tissue fragments.

[0052] It should be noted that, in the present embodiment, the power unit may also adopt another structure, such as a worm gear transmission, in which a circle of teeth is arranged on the outer edge of the rotating disk 304, the worm and the rotating disk 304 are meshed for transmission, one end of the worm extends out from the side wall of the second tube body 301, and the worm and the second tube body 301 are sealed and rotationally connected, and the worm is rotated, the rotating disk 304 rotates around the central axis of the second tube body 301, and the cutting blade 303 cuts the blood clots or tissue fragments.

[0053] The torsion part can also adopt another structure, such as selecting a torsion spring. When in use, the fixed end of the torsion spring is fixedly connected to the second tube body 301, and the free end of the torsion spring is fixedly connected to the rotating disk 304. When the rotating disk 304 rotates, the free end of the torsion spring can rotate with the rotating disk 304 and generate a rebound force to help the rotating rod 302 rotate.

[0054] In order to improve this embodiment, Figure 6 , Figure 7 As shown, a limiting ring 313 is fixedly provided on the inner wall of the second tube body 301 at a position corresponding to the rotating disk 304, and a slot 314 is provided on the limiting ring 313. The width of the slot 314 is adapted to the width of the rotating disk 304. Adaptation here means that the width of the slot 314 is equal to the thickness of the rotating disk 304. When in use, the outer edge of the rotating disk 304 extends into the slot 314, and the side wall of the limiting ring 313 limits the rotating disk 304 to prevent the rotating disk 304 from shaking forward or backward when rotating; and a gap is left between the outer edge of the rotating disk 304 and the bottom of the slot 314 to ensure that no friction occurs between the pull rope 306 wrapped on the outer edge and the bottom of the slot 314 when rotating.

[0055] 3. Drainage tube 2

[0056] In clinical practice, the drainage tube 2 is mostly made of silicone rubber. In this embodiment, the diameter of the drainage tube 2 is equal to or slightly smaller than the diameter of the second tube body 301. When in use, the rear end of the drainage tube 2 is sleeved on the front end of the second tube body 301 to achieve a sealed and fixed connection between the drainage tube 2 and the second tube body 301.

[0057] When using this embodiment, the front end of the drainage tube 2 is inserted into the wound, and then the pull rod 12 is pulled backward until the protrusion 15 is stuck in the groove 14 and stops. At this time, the first tube body 11 is in a negative pressure state, which generates suction force on the accumulated fluid in the wound to drain. If blood clots or tissue fragments enter the drainage tube 2 and cause blockage, the pull rope 306 in the dredging component 3 is operated. Under the action of the pull rope 306 and the plane volute spring 309, the rotating rod 302 rotates forward and backward to crush the blood clots or tissue fragments, and then drains them into the first tube body 11 through the liquid hole 305 to ensure normal drainage.

[0058] It should be noted that the above is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiment, those skilled in the art can still modify the technical solutions recorded in the above embodiment or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A simple negative pressure drainage device, comprising a negative pressure assembly and a drainage tube, wherein the negative pressure assembly comprises a first tube body and a pull rod arranged in the first tube body, the pull rod and the first tube body are sealed and slidably connected, the sliding direction of the pull rod is along the length direction of the first tube body, a connecting tube is arranged at one end of the first tube body facing the drainage tube, the drainage tube is fixedly sleeved on the connecting tube, and a positioning portion for keeping the pull rod in a pulled-out state is arranged on the first tube body, characterized in that: A dredging assembly is arranged between the connecting tube and the drainage tube, and the dredging assembly includes a second tube body, in which a rotating rod is rotatably arranged, the rotating rod is arranged along the axial direction of the second tube body, and the rotating rod makes a rotating motion around the central axis of the second tube body, and a plurality of cutting blades for breaking up blood clots are fixedly arranged at one end of the rotating rod close to the drainage tube; a power unit for driving the rotating rod to rotate is arranged on the second tube body; the second tube body and the connecting tube, as well as the second tube body and the drainage tube are all fixedly connected with each other.

2. A simple negative pressure drainage device according to claim 1, characterized in that: A torsion portion is also provided in the second tube body, a fixed end of the torsion portion is fixedly connected to the second tube body, a free end of the torsion portion is fixedly connected to the rotating rod, and the free end of the torsion portion generates a rebound force after rotating with the rotating rod to help the rotating rod to rotate.

3. A simple negative pressure drainage device according to claim 2, characterized in that: A rotating disk is rotatably arranged in the second tube body between the rotating rod and the torsion part. The radial direction of the rotating disk is arranged along the radial direction of the second tube body. The rotating rod is vertically fixed on the rotating disk. The free end of the torsion part is fixedly connected to the rotating disk. A plurality of liquid holes are arranged on the rotating disk.

4. A simple negative pressure drainage device according to claim 3, characterized in that: The power part includes a pull rope which is wound around the edge of the rotating disk along its circumference, and the free end of the pull rope extends out of the second tube body; a deformable member is arranged between the pull rope and the second tube body, and the deformable member and the second tube body, as well as the deformable member and the pull rope, are all sealed and fixedly connected, and the deformable member protrudes toward the outside of the second tube body or returns toward the second tube body as the pull rope is pulled.

5. A simple negative pressure drainage device according to claim 4, characterized in that: The torsion part includes a fixed disk and a planar scroll spring. The radial directions of the planar scroll spring and the fixed disk are both arranged along the radial direction of the second tube body. The planar scroll spring is arranged close to the rotating disk. The fixed disk is fixed in the second tube body. The rotating disk and the fixed disk are rotationally connected. The fixed disk is provided with a plurality of liquid holes. A first bracket is fixedly provided on the fixed disk. The fixed end of the planar scroll spring is hung with the first bracket. A second bracket is fixedly provided on the rotating disk. The free end of the planar scroll spring is hung with the second bracket.

6. A simple negative pressure drainage device according to claim 5, characterized in that: The deformable piece is made of rubber or leather.

7. A simple negative pressure drainage device according to any one of claims 3 to 6, characterized in that: A limit ring is arranged on the inner wall of the second tube at a position corresponding to the rotating disk, and a slot matching the thickness of the rotating disk is arranged on the limit ring for the outer edge of the rotating disk to extend into, and a gap is left between the outer edge of the rotating disk and the bottom of the slot.

8. A simple negative pressure drainage device according to any one of claims 1 to 6, characterized in that: The positioning portion includes a groove arranged on the inner wall of the first tube body away from one end of the connecting tube, the opening of the groove is close to the pull rod, and a protrusion adapted to the groove is fixed on the outer diameter of the end of the pull rod extending into the tube body. A spring is arranged between the protrusion and the pull rod. The spring is in a compressed state, and the protrusion abuts against the inner wall of the first tube body.

9. A simple negative pressure drainage device according to claim 8, characterized in that: A sealing ring is arranged between one end of the pull rod extending into the tube body and the inner wall of the first tube body. The sealing ring is sleeved on the outer diameter of the pull rod and is in sealing contact with the inner wall of the first tube body.

10. A simple negative pressure drainage device according to any one of claims 1 to 6 and 9, characterized in that: The first tube body is provided with scale lines along its length direction.

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