Portable negative pressure suction apparatus

Abstract

The present invention relates to the field of medical equipment technology, and in particular to a portable negative pressure aspirator, comprising a negative pressure cylinder, a liquid collecting tank arranged in the negative pressure cylinder, a drainage tube for draining the accumulated fluid in the patient's wound to the liquid collecting tank, and an exhaust mechanism for generating negative pressure in the inner cavity of the negative pressure cylinder; the negative pressure cylinder comprises a cylinder body and a cover body; the first end of the drainage tube is connected to the enclosed space at the wound, and the second end of the drainage tube is connected to the liquid collecting tank; the drainage tube comprises a coaxially arranged outer tube and an inner tube, the inner tube is slidably arranged in the outer tube, the second end of the inner tube extends downwardly out of the outer tube, the second end of the inner tube is sleeved with a fixing ring, and an elastic member for forcing the second end of the inner tube to retract into the outer tube is arranged between the fixing ring and the top inner wall of the cover body; the liquid collecting tank is detachably connected to the lower end of the fixing ring. The inner tube of this solution is in a sliding state relative to the outer tube, which is conducive to preventing the accumulated fluid from condensing on the inner wall of the inner tube and the inner wall of the outer tube, so that the drainage tube remains unobstructed to enable continuous negative pressure drainage.

Description

Technical Field

[0001] The present invention relates to the technical field of medical instruments, in particular to a portable negative pressure aspirator. Background Art

[0002] Negative pressure wound therapy is a new technology for treating wounds that has been developed in recent years. It mainly involves pasting a thin film around the wound to form a closed space covering the wound, and then using a negative pressure drainage device to drain the wound fluid in the closed space, thereby effectively promoting wound healing and alleviating the pain of the injured. Negative pressure tubes and related electronic equipment are usually integrated on the walls of hospitals to assist in the clinical implementation of negative pressure wound therapy. However, in conditions such as emergency rescue and battlefield environments where patients are away from the hospital, it is impossible to use the equipment in the hospital to perform negative pressure wound therapy on the injured, which can lead to serious conditions for the injured. In order to solve the above problems, people have designed portable negative pressure suction devices, such as the prior art CN 113425922 B discloses a portable negative pressure suction device comprising a negative pressure barrel; a drainage bag installed within the negative pressure barrel, through which fluid accumulated in a patient's wound is drained; a connecting tube installed within the negative pressure barrel, one end of which is inserted into the drainage bag and the other end of which extends to the VSD film outside the patient's wound, allowing fluid accumulated in the patient's wound to flow into the drainage bag along the connecting tube; a connector installed outside the negative pressure barrel, through which the patient's waist is connected to the negative pressure barrel, allowing the negative pressure barrel to move synchronously with the patient's movement; and a suction mechanism installed outside the negative pressure barrel, one end of which extends into the interior of the drainage bag. The suction mechanism draws air, allowing the drainage bag to extract fluid accumulated in the connecting tube. This solution can achieve continuous negative pressure wound treatment for the patient as they move, accelerating wound healing. However, as drainage time increases, the fluid accumulated in the connecting tube will condense on the inner wall of the connecting tube, blocking the connecting tube and causing drainage to stop. Medical personnel must clean the connecting tube before drainage can resume, and this solution cannot effectively provide continuous drainage. Summary of the Invention

[0003] The object of the present invention is to provide a portable negative pressure aspirator to solve the problem of condensation and blockage of fluid accumulation in the connecting tube in the above-mentioned prior art.

[0004] To achieve the above object, the basic scheme of the present invention is as follows:

[0005] A portable negative pressure suction device comprises a negative pressure cylinder, a fluid collecting tank disposed in the negative pressure cylinder, a drainage tube for guiding fluid accumulated in the patient's wound to the fluid collecting tank, and an air extraction mechanism for generating negative pressure in the inner cavity of the negative pressure cylinder;

[0006] The negative pressure cylinder is vertically arranged and comprises a cylinder with an open upper end and a cover body sealed on the upper end of the cylinder;

[0007] The air extraction mechanism is provided on the cover body and is connected to the inner cavity of the negative pressure cylinder through a negative pressure pipe;

[0008] The first end of the drainage tube is in communication with the enclosed space at the wound, and the second end of the drainage tube vertically passes through the cover body and extends into the negative pressure cylinder to communicate with the liquid collecting tank;

[0009] The drainage tube includes an outer tube and an inner tube arranged coaxially, the inner tube is arranged in the outer tube and is sealed and slidably connected to the inner wall of the outer tube so that the inner tube can slide and rotate relative to the outer tube, the outer tube is sealed and fixedly connected to the cover body, the first end of the inner tube is located in the outer tube, the second end of the inner tube extends downwardly out of the outer tube, the second end of the inner tube is sleeved with a fixing ring, the fixing ring is fixedly connected to the inner tube, a plurality of through holes are evenly distributed on the tube wall of the inner tube along the diameter direction of the inner tube, and an elastic member is provided between the fixing ring and the top inner wall of the cover body to force the second end of the inner tube to retract into the outer tube;

[0010] The liquid collecting tank is a tank body with an open upper end, and the liquid collecting tank is detachably connected to the fixing ring.

[0011] In the above basic scheme, the vacuum mechanism is operated to form a negative pressure in the inner cavity of the negative pressure cylinder and drain the wound fluid into the paper collection tank through the drainage tube. When the amount of fluid accumulation components in the collection tank increases, the weight of the collection tank increases to overcome the elastic force of the elastic part and move downward and drive the inner tube to slide downward. When the inner tube slides relative to the outer tube, the accumulated fluid condensation that may condense on the inner wall of the inner tube and the inner wall of the outer appearance is scraped off. During the drainage process, as the accumulated fluid gradually increases in the collection tank, the collection tank drives the inner tube to slide relative to the outer tube, which is beneficial to prevent the accumulated fluid from condensing on the inner wall of the inner tube and the inner wall of the outer tube, so that the drainage tube remains unobstructed to enable continuous negative pressure drainage.

[0012] Furthermore, the air pumping mechanism includes a horizontally arranged air cylinder, a slider sealingly and slidingly connected to the inner wall of the air cylinder, and a push rod fixedly connected to the slider, the air cylinder is a cylindrical body closed at both ends, the slider divides the inner cavity of the air cylinder into a first cavity and a second cavity, one end of the push rod is located in the first cavity and fixedly connected to the slider, the other end of the push rod extends out of the air cylinder along the axial direction of the air cylinder, a spring is arranged in the second cavity along the axial direction of the air cylinder, the first end of the spring is fixedly connected to the slider, the second end of the spring is fixedly connected to the inner wall of the air cylinder, the first end of the negative pressure tube is communicated with the second cavity, the second end of the negative pressure tube passes through the air cylinder and the cover body and extends into the negative pressure cylinder, a first one-way valve is arranged on the negative pressure tube, an exhaust hole is arranged on the air cylinder to connect the second cavity with the external space of the air cylinder, and a second one-way valve is arranged on the exhaust hole.

[0013] Furthermore, the portable negative pressure suction device further includes a rotating mechanism for causing the inner tube to rotate, the rotating mechanism including a transmission rod, a first gear, a second gear, a third gear, a rotating ring and a rotating drum, and the second end of the outer tube and the second end of the inner tube are both hard tubes;

[0014] The transmission rod is vertically arranged, the upper end of the transmission rod is located in the first cavity, the lower end of the transmission rod passes through the air cylinder and the cover body and extends into the negative pressure cylinder, the transmission rod is sealed and rotatably connected to the cover body, the upper end of the transmission rod is fixedly connected to the first gear, the push rod located in the first cavity is provided with a rack segment meshing with the first gear, and the lower end of the transmission rod is fixedly connected to the second gear;

[0015] The third gear is located above the fixing ring and sleeved on the outside of the inner tube. The third gear is meshed with the second gear. The second end of the inner tube is provided with an external spline, and the inner wall of the third gear is provided with an internal spline that is slidably matched with the external spline.

[0016] The rotating ring is coaxially arranged with the second end of the inner tube, the rotating ring is fixedly connected to the top inner wall of the cover body, and the lower end surface of the rotating ring is provided with an annular sliding groove coaxial with the second end of the inner tube;

[0017] The rotating drum is a cylinder with both ends open and coaxially arranged with the second end of the inner tube. The upper end of the rotating drum is provided with an annular slider that slidably cooperates with the annular slide groove, and the lower end of the rotating drum is fixedly connected to the third gear.

[0018] The elastic member is a tension spring sleeved on the outside of the second end of the inner tube, the upper end of the tension spring is fixedly connected to the third gear, and the lower end of the tension spring is fixedly connected to the fixing ring.

[0019] When it is necessary to generate negative pressure in the inner cavity of the negative pressure cylinder to perform negative pressure suction on the wound, the push rod is pushed to drive the slider toward the second cavity, the spring is compressed, the air pressure in the second cavity increases, the first one-way valve is closed, and the gas in the second cavity is discharged to the outside of the negative pressure cylinder by the second one-way valve. When the push rod moves, the rack on the rack segment on the push rod drives the first gear and finally drives the inner tube to rotate through the third gear. When the push rod is stopped, the compressed spring pushes the slider toward the first cavity to form a negative pressure in the second cavity, the second one-way valve is closed, the first one-way valve is opened, and the inner cavity of the negative pressure cylinder connected to the second cavity forms a negative pressure. Since the outer wall of the second end of the inner tube is provided with an external spline, the inner cavity of the liquid collection tank is connected to the inner cavity of the negative pressure cylinder outside the liquid collection tank through the keyway of the external spline, and the inner cavity of the liquid collection tank also forms a negative pressure. As the accumulated fluid increases and external gas caused by other reasons enters the drainage tube, the negative pressure in the negative pressure cylinder decreases, and the spring will further push the slider toward the first cavity. The cam is pressed against the outer surface of the drainpipe to release the excess fluid, which in turn causes the drainpipe to move downwards, thereby reducing the risk of clogging the drainpipe.

[0020] When the liquid in the liquid collecting tank needs to be poured out, the cylinder is first unscrewed, and then the liquid collecting tank is unscrewed to pour out the accumulated liquid in the liquid collecting tank. After pouring out the liquid in the liquid collecting tank, the inner tube slides relative to the outer tube and resets under the tension of the tension spring.

[0021] Furthermore, an external thread is provided on the outer wall of the fixing ring, and an internal thread matching the external thread on the fixing ring is provided on the open end of the liquid collecting tank, and the liquid collecting tank is threadedly connected to the fixing ring.

[0022] Furthermore, the inner wall of the cover body is provided with an internal thread, the outer wall of the upper end of the cylinder body is provided with an external thread that matches the internal thread on the cover body, and the cover body is threadedly connected to the cylinder body.

[0023] Furthermore, a sealing ring is provided on the upper end surface of the cylinder.

[0024] Furthermore, the cylinder and the liquid collecting tank are both made of transparent material.

[0025] Compared with the prior art, the present invention has at least the following beneficial effects:

[0026] 1. This solution generates negative pressure manually, has a simple structure, does not require power, and has wide adaptability.

[0027] 2. In this solution, when the slider is pushed manually or when the spring forces the slider to slide to generate negative pressure, the inner tube rotates relative to the outer tube. That is, during the entire negative pressure drainage process, as the spring pushes the slider to slide, the inner tube is always rotating relative to the outer tube, which can effectively prevent the accumulated fluid from condensing and clogging the drainage tube.

[0028] 3. In this solution, during the entire negative pressure drainage process, as the amount of fluid accumulated in the fluid collection tank gradually increases, the inner tube is always in a state of slow sliding relative to the outer tube. During the entire negative pressure drainage process, the inner tube is in a state of rotation and sliding relative to the outer tube, further effectively preventing the accumulated fluid from condensing and clogging.

[0029] 4. In this solution, the cylinder and the cover, as well as the liquid collecting tank and the fixing ring, can be easily disassembled and quickly connected, so the liquid collecting tank can be easily removed.

[0030] 5. The inner tube in this solution is provided with a through hole, which plays a role in removing the accumulated liquid and condensation when the inner tube rotates and slides relative to the outer tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings described herein are used to provide further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0032] In the attached figure:

[0033] Figure 1 It is a structural schematic diagram of the main viewing direction of the present invention.

[0034] Figure 2 for Figure 1 Enlarged view of part A in the middle.

[0035] Figure 3 It is a structural schematic diagram of the air extraction mechanism when viewed from the left.

[0036] Figure 4 Schematic diagram of the structure of the air extraction mechanism viewed from above.

[0037] The meanings of the reference numerals in the accompanying drawings are:

[0038] Negative pressure cylinder 10, cylinder body 101, cover body 102, liquid collecting tank 20, drainage tube 30, outer tube 301, inner tube 302, through hole 3021, external spline 3022, fixing ring 303, air cylinder 40, first cavity 401, second cavity 402, air leak hole 403, exhaust hole 404, second one-way valve 405, slider 41, push rod 42, rack segment 421, spring 43, negative pressure tube 44, first one-way valve 45, transmission rod 51, first gear 52, second gear 53, third gear 54, rotating ring 55, rotating drum 56, bearing seat 57, annular slide groove 58, annular slider 59, tension spring 60, sealing ring 61. DETAILED DESCRIPTION

[0039] To make the purpose, technical solutions, and advantages of this application more clear, the technical solutions of this application will be clearly and completely described below in conjunction with the specific embodiments of this application and the corresponding drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0041] The portable negative pressure suction device of this embodiment is as follows Figure 1-Figure 4 As shown, it includes a negative pressure cylinder 10, a liquid collecting tank 20 arranged in the negative pressure cylinder 10, a drainage tube 30 that guides the patient's wound fluid to the liquid collecting tank 20, and an exhaust mechanism that generates negative pressure in the inner cavity of the negative pressure cylinder 10.

[0042] The negative pressure cylinder 10 is arranged vertically. The negative pressure cylinder 10 includes a circular cylinder 101 with an open upper end and a cover 102 that is sealed on the upper end of the cylinder 101. Specifically, the inner wall of the cover 102 is provided with an internal thread, and the outer wall of the upper end of the cylinder 101 is provided with an external thread that cooperates with the internal thread on the cover 102. The cover 102 is threadedly connected to the cylinder 101, and a sealing ring 61 is provided on the upper end face of the cylinder 101 so that the cover 102 seals and covers the upper end of the cylinder 101.

[0043] The air extraction mechanism is arranged on the cover body 102, and the air extraction mechanism includes a horizontally arranged air cylinder 40, a slider 41 that is sealingly and slidingly connected to the inner wall of the air cylinder 40, and a push rod 42 that is fixedly connected to the slider 41. The air cylinder 40 is a circular cylinder 101 with two closed ends. The air cylinder 40 is arranged on the upper surface of the cover body 102 and is fixedly connected to the cover body 102. The slider 41 divides the inner cavity of the air cylinder 40 into a first cavity 401 and a second cavity 402. One end of the push rod 42 is located in the first cavity 401 and is fixedly connected to the slider 41. The other end of the push rod 42 extends out of the air cylinder 40 along the axial direction of the air cylinder 40. The push rod 42 is slidably connected to the air cylinder 40. The air cylinder 40 is provided with an air vent 403 that connects the first cavity 401 with the external space of the air cylinder 40. The air vent 403 is provided in the second cavity 402 along the axial direction of the air cylinder 40. A spring 43 is provided, a first end of the spring 43 is fixedly connected to the slider 41, a second end of the spring 43 is fixedly connected to the inner wall of the air cylinder 40, a negative pressure tube 44 is provided on the air cylinder 40, the negative pressure tube 44 is vertically provided, the upper end of the negative pressure tube 44 is communicated with the second cavity 402, the lower end of the negative pressure tube 44 passes through the air cylinder 40 and the cover body 102 and extends into the negative pressure cylinder 10, the outer wall of the negative pressure tube 44 is sealed and fixedly connected to the air cylinder 40 and the cover body 102, a first one-way valve 45 is provided on the negative pressure tube 44, which only allows fluid to flow from the external space of the air cylinder 40 into the second cavity 402, an exhaust hole 404 is provided on the air cylinder 40, which connects the second cavity 402 with the external space of the air cylinder 40, and a second one-way valve 405 is provided on the exhaust hole 404, which only allows fluid to flow out of the air cylinder 40 from the second cavity 402.

[0044] The first end of the drainage tube 30 communicates with the enclosed space at the wound site, and the second end of the drainage tube 30 extends vertically through the cover 102 into the negative pressure cylinder 10 and communicates with the liquid collection tank 20. The drainage tube 30 includes a coaxially arranged outer tube 301 and an inner tube 302. The inner tube 302 is disposed within the outer tube 301 and is in sealed sliding connection with the inner wall of the outer tube 301, allowing the inner tube 302 to slide and rotate relative to the outer tube 301. The second end of the outer tube 301 and the second end of the inner tube 302 are both configured as rigid tubes to facilitate sealed and fixed connection with the cover 102. The first end of the outer tube 301 and the first end of the inner tube 302 are both configured as soft tubes. The outer wall of the second end of the outer tube 301 is sealed and fixedly connected to the cover body 102. The first end of the inner tube 302 is located inside the outer tube 301, and the second end of the inner tube 302 extends downwardly out of the outer tube 301. A fixing ring 303 is sleeved on the second end of the inner tube 302. The fixing ring 303 is an annular plate and is fixedly connected to the outer wall of the inner tube 302. Figure 1 As shown, a plurality of through holes 3021 are evenly distributed on the wall of the inner tube 302 along the diameter direction of the inner tube 302 .

[0045] The portable negative pressure suction device of this embodiment also includes a rotating mechanism for causing the inner tube 302 to rotate, and the rotating mechanism includes a transmission rod 51, a first gear 52, a second gear 53, a third gear 54, a rotating ring 55 and a rotating cylinder 56. The transmission rod 51 is vertically arranged, and the upper end of the transmission rod 51 is located in the first cavity 401. The lower end of the transmission rod 51 passes through the air cylinder 40 and the cover body 102 and extends into the negative pressure cylinder 10. The transmission rod 51 is sealed and rotatably connected to the cover body 102. A bearing seat 57 is fixedly connected to the inner wall of the top of the cover body 102. A thrust bearing that is tightly matched with the transmission rod 51 is installed on the bearing seat 57. The transmission rod 51 is rotatably connected to the cover body 102 through the thrust bearing. The upper end of the transmission rod 51 is fixedly connected to the first gear 52. The push rod 42 located in the first cavity 401 is provided with a gear that meshes with the first gear 52. The third gear 54 is located above the fixed ring 303 and is sleeved on the outside of the inner tube 302. The third gear 54 meshes with the second gear 53. The second end of the inner tube 302 is provided with an external spline 3022, and the inner wall of the third gear 54 is provided with an internal spline that slides with the external spline 3022. The rotating ring 55 is coaxially arranged with the second end of the inner tube 302. The rotating ring 55 is fixedly connected to the top inner wall of the cover body 102. The lower end surface of the rotating ring 55 is provided with an annular groove 58 coaxial with the second end of the inner tube 302. The rotating cylinder 56 is a cylinder with two ends opened coaxially arranged with the second end of the inner tube 302. The upper end of the rotating cylinder 56 is provided with an annular slider 5941 that slides with the annular groove 58. The lower end of the rotating cylinder 56 is fixedly connected with the third gear 54. Figure 2 As shown, in this embodiment, the cross-section of the annular groove 58 is a T-shaped groove, and the annular slider 5941 is a T-shaped slider 41 that slidably cooperates with the annular groove 58, thereby preventing the third gear 54 from sliding up and down. A tension spring 60 is sleeved on the second end of the inner tube 302. The upper end of the tension spring 60 is fixedly connected to the third gear 54, and the lower end of the tension spring 60 is fixedly connected to the fixing ring 303.

[0046] The liquid collecting tank 20 is a circular tank body with an open upper end. The outer wall of the fixing ring 303 is provided with an external thread. The open end of the liquid collecting tank 20 is provided with an internal thread that matches the external thread on the fixing ring 303. The liquid collecting tank 20 is threadedly connected to the fixing ring 303.

[0047] In order to facilitate observation of the internal conditions of the negative pressure cylinder 10 , the cylinder body 101 and the liquid collecting tank 20 are both made of transparent material, preferably transparent acrylic.

[0048] When using this solution, the negative pressure cylinder is placed at a position lower than the wound. When it is necessary to generate negative pressure in the inner cavity of the negative pressure cylinder 10 to perform negative pressure suction on the wound, the push rod 42 is pushed to drive the slider 41 to move toward the second cavity 402. The spring 43 is compressed, the air pressure in the second cavity 402 increases, the first one-way valve 45 is closed, and the gas in the second cavity 402 flows out of the negative pressure cylinder 10 through the second one-way valve 405. When the push rod 42 moves, the rack on the rack segment 421 on the push rod 42 drives the first gear 52 and finally drives the inner tube 302 to rotate through the third gear 54. When the push rod 42 is stopped being squeezed, the compressed spring 43 pushes the slider 41 toward the first cavity 401 to form a negative pressure in the second cavity 402. The second one-way valve 405 is closed, and the first one-way valve 45 is opened. Negative pressure is formed in the inner cavity of the negative pressure cylinder 10 connected to the second cavity 402, as shown in FIG. Figure 1 、 Figure 2 As shown, since the outer wall of the second end of the inner tube 302 is provided with an external spline 3022, the inner cavity of the liquid collecting tank 20 is connected with the inner cavity of the negative pressure cylinder 10 outside the liquid collecting tank 20 through the channel formed by the keyway of the external spline 3022, and the inner cavity of the liquid collecting tank 20 also forms a negative pressure. As the liquid accumulated in the wound is precipitated and the external gas caused by other reasons enters the drainage tube 30, the negative pressure in the negative pressure cylinder 10 is reduced. The spring 43 will further push the slider 41 to slide toward the first cavity 401 to maintain the negative pressure in the inner cavity of the negative pressure cylinder 10. When the slider 41 slowly slides toward the first cavity 401 The rack on the rack segment 421 on the push rod 42 drives the first gear 52 and finally drives the inner tube 302 to rotate slowly through the third gear 54. At the same time, the accumulated fluid in the liquid collecting tank 20 gradually increases, causing the liquid collecting tank 20 to overcome the tension of the tension spring 60 and move downward and drive the inner tube 302 to slide relative to the outer tube 301. That is, in the process of the vacuum mechanism continuously generating negative pressure on the negative pressure cylinder 10, the inner tube 302 continues to rotate and slide slowly relative to the outer tube 301, which can effectively prevent the accumulated fluid from condensing in the drainage tube 30 and blocking the drainage tube 30, so that negative pressure drainage can continue, thereby accelerating the recovery of the wound.

[0049] When the liquid in the liquid collecting tank 20 needs to be poured out, the cylinder 101 is first unscrewed, and then the liquid collecting tank 20 is unscrewed to pour out the accumulated liquid in the liquid collecting tank 20. After pouring out the liquid in the liquid collecting tank 20, the inner tube 302 slides relative to the outer tube 301 under the tension of the tension spring 60 to reset.

[0050] The above are only embodiments of the present invention, and the common knowledge such as the specific structure and characteristics of the scheme are not described in detail here. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A portable negative pressure aspirator comprising a negative pressure cylinder, a fluid collection tank disposed within the negative pressure cylinder, a drainage tube for directing fluid accumulated in a patient's wound to the fluid collection tank, and an air extraction mechanism for generating negative pressure within the negative pressure cylinder, characterized in that: The negative pressure cylinder is vertically arranged and comprises a cylinder with an open upper end and a cover body sealed on the upper end of the cylinder; The air extraction mechanism is provided on the cover body and is connected to the inner cavity of the negative pressure cylinder through a negative pressure pipe; The first end of the drainage tube is in communication with the enclosed space at the wound, and the second end of the drainage tube vertically passes through the cover body and extends into the negative pressure cylinder to communicate with the liquid collecting tank; The drainage tube includes an outer tube and an inner tube arranged coaxially, the inner tube is arranged in the outer tube and is sealed and slidably connected to the inner wall of the outer tube so that the inner tube can slide and rotate relative to the outer tube, the outer tube is sealed and fixedly connected to the cover body, the first end of the inner tube is located in the outer tube, the second end of the inner tube extends downwardly out of the outer tube, the second end of the inner tube is sleeved with a fixing ring, the fixing ring is fixedly connected to the inner tube, a plurality of through holes are evenly distributed on the tube wall of the inner tube along the diameter direction of the inner tube, and an elastic member is provided between the fixing ring and the top inner wall of the cover body to force the second end of the inner tube to retract into the outer tube; The liquid collecting tank is a tank body with an open upper end, and the liquid collecting tank is detachably connected to the fixing ring; The air extraction mechanism includes a horizontally arranged air cylinder, a slider in sealing and sliding connection with the inner wall of the air cylinder, and a push rod fixedly connected to the slider. The air cylinder is a cylindrical body with both ends closed. The slider divides the inner cavity of the air cylinder into a first cavity and a second cavity. One end of the push rod is located in the first cavity and fixedly connected to the slider, and the other end of the push rod extends out of the air cylinder along the axial direction of the air cylinder. The portable negative pressure suction device further includes a rotating mechanism for causing the inner tube to rotate, the rotating mechanism including a transmission rod, a first gear, a second gear, a third gear, a rotating ring, and a rotating drum, and the second end of the outer tube and the second end of the inner tube are both hard tubes; The transmission rod is vertically arranged, the upper end of the transmission rod is located in the first cavity, the lower end of the transmission rod passes through the air cylinder and the cover body and extends into the negative pressure cylinder, the transmission rod is sealed and rotatably connected to the cover body, the upper end of the transmission rod is fixedly connected to the first gear, the push rod located in the first cavity is provided with a rack segment meshing with the first gear, and the lower end of the transmission rod is fixedly connected to the second gear; The third gear is located above the fixing ring and is sleeved on the outside of the inner tube. The third gear is engaged with the second gear. The second end of the inner tube is provided with an external spline, and the inner wall of the third gear is provided with an internal spline that slides with the external spline.

2. The portable negative pressure aspirator according to claim 1, characterized in that: A spring is arranged in the second cavity along the axis direction of the air cylinder, the first end of the spring is fixedly connected to the slider, the second end of the spring is fixedly connected to the inner wall of the air cylinder, the first end of the negative pressure tube is communicated with the second cavity, the second end of the negative pressure tube passes through the air cylinder and the cover body and extends into the negative pressure cylinder, a first one-way valve is arranged on the negative pressure tube, an exhaust hole is arranged on the air cylinder to connect the second cavity with the external space of the air cylinder, and a second one-way valve is arranged on the exhaust hole.

3. The portable negative pressure aspirator according to claim 2, characterized in that: The rotating ring is coaxially arranged with the second end of the inner tube, the rotating ring is fixedly connected to the top inner wall of the cover body, and the lower end surface of the rotating ring is provided with an annular sliding groove coaxial with the second end of the inner tube; The rotating drum is a cylinder with both ends open and coaxially arranged with the second end of the inner tube. The upper end of the rotating drum is provided with an annular slider that slidably cooperates with the annular slide groove, and the lower end of the rotating drum is fixedly connected to the third gear. The elastic member is a tension spring sleeved on the outside of the second end of the inner tube, the upper end of the tension spring is fixedly connected to the third gear, and the lower end of the tension spring is fixedly connected to the fixing ring.

4. The portable negative pressure aspirator according to claim 3, characterized in that: The outer wall of the fixing ring is provided with an external thread, the open end of the liquid collecting tank is provided with an internal thread that matches the external thread on the fixing ring, and the liquid collecting tank is threadedly connected to the fixing ring.

5. The portable negative pressure aspirator according to claim 4, characterized in that: The inner wall of the cover body is provided with an internal thread, the outer wall of the upper end of the cylinder body is provided with an external thread that matches the internal thread on the cover body, and the cover body is threadedly connected to the cylinder body.

6. The portable negative pressure aspirator according to claim 5, characterized in that: The upper end surface of the cylinder is provided with a sealing ring.

7. The portable negative pressure aspirator according to claim 6, characterized in that: The cylinder and the liquid collecting tank are both made of transparent materials.

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