Debridement device for general surgery department

By designing a debridement device for general surgery, the problems of inefficiency and risk of cross-infection by artificial spraying of disinfectants are solved, and a more efficient and accurate debridement process is achieved, improving surgical efficiency and patient comfort.

CN119792701AInactive Publication Date: 2025-04-11WUXI PEOPLES HOSPITAL
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Patent Information

Application Number
CN202510139113.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-02-08
Publication Date
2025-04-11
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

In existing general surgery, the method of artificially spraying disinfectant is inefficient, which can easily cause the risk of disinfectant waste and cross-infection. At the same time, long-term operation of medical staff leads to strain and fatigue, affecting the precision and durability of the surgery.

Method used

A debridement device for general surgery is designed, including a bottom support plate, a debridement frame, a liquid spray head and a liquid pump system. The precise movement of the liquid spray head and automatic spraying of liquid is achieved through the driving motor and slide rod mechanism.

Benefits of technology

It significantly improves the accuracy and effectiveness of the debridement process, reduces the waste of disinfectant, reduces the risk of cross-infection, reduces the labor intensity of medical staff, and improves surgical efficiency and patient comfort.

✦ Generated by Eureka AI based on patent content.

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Abstract

The debridement device for the general surgery department comprises a bottom supporting plate and a debridement frame, a supporting rod is fixedly mounted at the top of the bottom supporting plate, a top mounting plate is fixedly mounted at the top of the supporting rod, a first moving frame is fixedly mounted on one side of the top of the top mounting plate, and a limiting sliding rod is fixedly mounted in the first moving frame; a second moving frame is fixedly mounted on the other side of the top of the top mounting plate, and a threaded rod is rotationally mounted in the second moving frame. A limiting seat is pushed, so that a movable sliding block moves in an arc-shaped sliding groove, a mounting box moves in a debridement frame, a liquid spraying head faces a wound position, the device is suitable for debridement treatment on wounds at different positions of an arm, the accuracy and effectiveness of the debridement process are greatly improved, and the debridement efficiency is improved. Therefore, the overall using effect is remarkably enhanced, the working efficiency of medical staff is improved, and more comfortable and safer treatment experience is brought to a patient.
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Description

Technical Field

[0001] The invention relates to the technical field of medical appliances, in particular to a debridement device used in general surgery. Background Art

[0002] General surgery is a clinical discipline that mainly uses surgery as the main method to treat liver, bile duct, pancreas, gastrointestinal, anorectal, vascular diseases, thyroid and breast tumors and trauma and other diseases. In addition to general surgery, general comprehensive hospitals also have orthopedics, neurosurgery, cardiothoracic surgery, urology, etc. General surgery often requires debridement of the patient's limbs. However, currently debridement is usually performed manually, which is too troublesome to use and has certain disadvantages.

[0003] In existing general surgery, manual spraying of saline, alcohol, iodine and other disinfectants is usually used to clean the patient's arm. This method relies on medical staff to continue spraying during the operation, which is inefficient, easily leads to waste of disinfectant, and may also pose a risk of cross-infection. Manual debridement requires medical staff to maintain a specific posture for a long time, which can easily lead to strain and fatigue, affecting the precision and durability of the operation. In addition, manual spraying makes it difficult to ensure that the disinfectant evenly and fully covers the surgical area, which may lead to incomplete local disinfection and increase the possibility of wound infection. Summary of the invention

[0004] The object of the present invention is to provide a debridement device for general surgery to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a debridement device for general surgery, comprising a bottom support plate and a debridement frame, a support rod is fixedly installed on the top of the bottom support plate, a top mounting plate is fixedly installed on the top of the support rod, a moving frame 1 is fixedly installed on one side of the top of the top mounting plate, a limiting sliding rod is fixedly installed inside the moving frame 1, a moving frame 2 is fixedly installed on the other side of the top of the top mounting plate, a threaded rod is rotatably installed inside the moving frame 2, a driving motor is fixedly installed on one side of the moving frame 2, and both sides of the debridement frame are fixedly installed There are two support frames, and threaded holes are provided in the interior of the two support frames on one side of the debridement frame away from one end of the debridement frame, and circular sliding holes are provided in the interior of the two support frames on the other side of the debridement frame away from one end of the debridement frame, and an arc-shaped slide groove is provided on the outer side of the debridement frame, and a movable slider is slidably installed in the interior of the arc-shaped slide groove, a limited seat is fixedly installed on the top of the movable slider, and a mounting box is fixedly installed on the bottom of the movable slider, and three liquid spray heads are connected to the bottom of the mounting box, a liquid tank is fixedly installed on the top of the top mounting plate, and three liquid pumps are fixedly installed on the top of the liquid tank.

[0006] Preferably, two support frames on one side of the debridement frame are threadedly connected to the outside of the threaded rod through a threaded hole at one end away from the debridement frame, and two support frames on the other side of the debridement frame are slidably installed on the outside of the limiting slide rod through a circular sliding hole at one end away from the debridement frame, and the output end of the drive motor is fixedly connected to one end of the threaded rod.

[0007] Preferably, two partitions are fixedly installed inside the liquid tank, and the two partitions divide the interior of the liquid tank into three liquid chambers, the liquid inlet ends of the three liquid pumps are connected to the three liquid chambers through pipes, and the liquid outlet ends of the three liquid pumps are connected to the three liquid spray heads through pipes, respectively, three liquid adding holes are opened on the top of the liquid tank, and sealing plugs are installed inside the three liquid adding holes.

[0008] Preferably, a support block is movably mounted on the top of the top mounting plate, an arc placement frame is fixedly mounted on the top of the support block, and a rubber pad is fixedly mounted on the inner side of the arc placement frame.

[0009] Preferably, a leakage hole is provided at the bottom of the debridement frame.

[0010] Preferably, the bottom of the top mounting plate is connected to a lower hopper.

[0011] Preferably, a placement groove is provided on the top of the bottom support plate, a protective half ring is fixedly installed on the top of the bottom support plate, a waste bucket is placed inside the placement groove, a baffle is installed inside the waste bucket, a mounting groove is provided inside the baffle, a rotating rod 2 is fixedly installed inside one end of the mounting groove, a rotating rod 1 is rotatably installed inside the other end of the mounting groove, a torsion spring is installed inside the mounting groove, two ends of the torsion spring are respectively connected to one end of the rotating rod 2 and the rotating rod 1, one end of the rotating rod 2 away from the torsion spring is rotatably installed on the inner wall of the waste bucket, and one end of the rotating rod 1 away from the torsion spring is fixedly connected to the inner wall of the waste bucket, a filter plate is fixedly installed inside the waste bucket, a drainage hole is provided at the bottom of one side of the waste bucket, and a rubber plug is installed inside the drainage hole, the top of the waste bucket is connected to a feeding barrel, a sealing cover is installed on the top of the feeding barrel, a ring is rotatably sleeved on the outer side of the sealing cover, and a connecting pull rope is fixedly connected between the ring and the waste bucket.

[0012] Preferably, a universal ball wheel is fixedly mounted on the bottom of the bottom support plate, and there are four universal ball wheels, which are symmetrically mounted at the four corners of the bottom of the bottom support plate in a rectangular shape.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. By pushing the limit seat, the movable slider moves inside the arc-shaped slide groove, so that the installation box moves inside the debridement frame, so that the spray head faces the wound position, which is suitable for debridement of wounds at different positions of the arm, greatly improving the accuracy and effectiveness of the debridement process, thereby significantly enhancing the overall use effect, not only improving the work efficiency of medical personnel, but also bringing a more comfortable and safe treatment experience to patients;

[0015] 2. By starting the three liquid pumps at intervals, the saline, alcohol and iodine tincture in the liquid tank are sprayed to the wound on the patient's arm through three spray heads in turn. The saline is used for preliminary cleaning of the wound, the alcohol is further disinfected, and the iodine tincture provides long-term antibacterial protection, which can better clean the wound of the patient and more effectively perform deep-level debridement on the wound of the patient, which not only accelerates the healing process of the wound, but also significantly reduces the risk of infection;

[0016] 3. The baffle can shield the inside of the waste bin, which can greatly reduce the strong and unpleasant smell emitted by vomitus from accidentally leaking out of the waste bin, thereby improving the comfort and hygiene of the surrounding environment, and can inhibit the spread of bacteria and viruses to a great extent, thereby significantly reducing the risk of cross-infection of pathogens, creating a safer, healthier and more efficient working environment for medical staff and related personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional appearance structure of the present invention.

[0018] Figure 2 It is a schematic diagram of the three-dimensional structure of the present invention when viewed from above.

[0019] Figure 3 It is a schematic diagram of the local three-dimensional structure of the present invention.

[0020] Figure 4 It is a schematic diagram of the partial appearance structure of the present invention.

[0021] Figure 5 It is a schematic diagram of the three-dimensional structure of the debridement frame of the present invention.

[0022] Figure 6 It is a partial bottom view of the structure of the present invention.

[0023] Figure 7 It is a schematic diagram of the cross-sectional structure of the waste barrel of the present invention.

[0024] Figure 8 For the present invention Figure 7 Enlarged structural diagram at A in the middle.

[0025] In the figure: 1, bottom support plate; 2, top mounting plate; 3, waste barrel; 4, support rod; 5, liquid tank; 6, liquid filling hole; 7, liquid pump; 8, debridement frame; 9, limit seat; 10, arc frame; 11, support block; 12, limit slide bar; 13, moving frame 1; 14, support frame; 15, protective half ring; 16, universal ball wheel; 17, lower hopper; 18, installation box; 19, drive motor; 20 , moving frame 2; 21, threaded rod; 22, arc-shaped slide groove; 23, leakage hole; 24, threaded hole; 25, circular slide hole; 26, spray head; 27, moving slider; 28, baffle; 29, connecting pull rope; 30, ring; 31, blocking cover; 32, feed barrel; 33, rotating rod 1; 34, rotating rod 2; 35, installation groove; 36, torsion spring; 37, placement groove; 38, filter plate. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] See also Figure 1-Figure 8The present invention provides a technical solution: a debridement device for general surgery, comprising a bottom support plate 1 and a debridement frame 8, a support rod 4 is fixedly installed on the top of the bottom support plate 1, a top mounting plate 2 is fixedly installed on the top of the support rod 4, a moving frame 13 is fixedly installed on one side of the top of the top mounting plate 2, a limited sliding rod 12 is fixedly installed inside the moving frame 13, a moving frame 20 is fixedly installed on the other side of the top of the top mounting plate 2, a threaded rod 21 is rotatably installed inside the moving frame 20, a driving motor 19 is fixedly installed on one side of the moving frame 20, two support frames 14 are fixedly installed on both sides of the debridement frame 8, threaded holes 24 are opened inside the two support frames 14 on one side of the debridement frame 8 away from one end of the debridement frame 8, circular sliding holes 25 are opened inside the two support frames 14 on the other side of the debridement frame 8 away from one end of the debridement frame 8, one end of the two support frames 14 on one side of the debridement frame 8 away from the debridement frame 8 is threadedly connected to the outer side of the threaded rod 21 through the threaded hole 24, and the two support frames 14 on the other side of the debridement frame 8 are threadedly connected to the outer side of the threaded rod 21 through the threaded hole 24. The end of the support frame 14 away from the debridement frame 8 is slidably installed on the outside of the limiting slide rod 12 through a circular sliding hole 25, the output end of the driving motor 19 is fixedly connected to one end of the threaded rod 21, an arc-shaped slide groove 22 is provided on the outside of the debridement frame 8, a leakage hole 23 is provided at the bottom of the debridement frame 8, a moving slider 27 is slidably installed inside the arc-shaped slide groove 22, a limiting seat 9 is fixedly installed on the top of the moving slider 27, and a mounting box 18 is fixedly installed on the bottom of the moving slider 27, and the bottom of the mounting box 18 is connected to There are three liquid spray heads 26, a liquid tank 5 is fixedly installed on the top of the top mounting plate 2, three liquid pumps 7 are fixedly installed on the top of the liquid tank 5, two partitions are fixedly installed inside the liquid tank 5, and the two partitions divide the inside of the liquid tank 5 into three liquid chambers, the liquid inlet ends of the three liquid pumps 7 are connected with the three liquid chambers through pipes, and the liquid outlet ends of the three liquid pumps 7 are connected with the three liquid spray heads 26 through pipes, three liquid adding holes 6 are opened on the top of the liquid tank 5, and sealing plugs are installed inside the three liquid adding holes 6.

[0028] The working principle of the above technical solution is as follows: first, the arm with the wound is placed inside the debridement frame 8, and then the limiting seat 9 is pushed according to the position of the wound, so that the movable slider 27 moves inside the arc-shaped slide groove 22, so that the installation box 18 moves inside the debridement frame 8, so that the liquid spray head 26 faces the wound position, which is suitable for debridement of wounds at different positions of the arm, greatly improving the accuracy and effectiveness of the debridement process, thereby significantly enhancing the overall use effect, not only improving the work efficiency of medical personnel, but also bringing a more comfortable and safe treatment experience to patients, and then the three liquid pumps 7 can be started at intervals, from The saline, alcohol and iodine tincture in the liquid tank 5 are sprayed onto the wound on the patient's arm through three spray heads 26 in turn. The saline is used for preliminary cleaning of the wound, the alcohol is used for further disinfection, and the iodine tincture provides long-lasting antibacterial protection, which can better clean the patient's wound and more effectively perform deep-level debridement on the patient's wound, which not only accelerates the wound healing process, but also significantly reduces the risk of infection. In addition, when the patient's wound is large, the drive motor 19 can be started to move forward and reverse, thereby driving the debridement frame 8 to move back and forth through the support frame 14, thereby performing comprehensive debridement on the patient's wound and improving the use effect of the device.

[0029] In another embodiment, Figure 1-Figure 8 As shown, a support block 11 is movably installed on the top of the top mounting plate 2, an arc frame 10 is fixedly installed on the top of the support block 11, and a rubber pad is fixedly installed on the inner side of the arc frame 10.

[0030] The arc support 10 can be provided to support the patient's arm to prevent fatigue caused by shouting.

[0031] In another embodiment, Figure 1-Figure 8As shown, the bottom of the top mounting plate 2 is connected with the lower hopper 17, the top of the bottom supporting plate 1 is provided with a placement groove 37, the top of the bottom supporting plate 1 is fixedly provided with a protective half ring 15, the waste bucket 3 is placed inside the placement groove 37, the waste bucket 3 is installed with a baffle 28, the baffle 28 is provided with a mounting groove 35, a rotating rod 2 34 is fixedly installed inside one end of the mounting groove 35, a rotating rod 1 33 is rotatably installed inside the other end of the mounting groove 35, a torsion spring 36 is installed inside the mounting groove 35, the two ends of the torsion spring 36 are respectively connected with one end of the rotating rod 2 34 and the rotating rod 1 33, and the end of the rotating rod 2 34 away from the torsion spring 36 is connected to the waste bucket 3 The inner wall is rotatably installed, and one end of the rotating rod 33 away from the torsion spring 36 is fixedly connected to the inner wall of the waste barrel 3, a filter plate 38 is fixedly installed inside the waste barrel 3, a drainage hole is opened at the bottom of one side of the waste barrel 3, and a rubber plug is installed inside the drainage hole, the top of the waste barrel 3 is connected to the feed cylinder 32, and a sealing cover 31 is installed on the top of the feed cylinder 32, and a ring 30 is rotatably sleeved on the outer side of the sealing cover 31, and a connecting rope 29 is fixedly connected between the ring 30 and the waste barrel 3, and a universal ball wheel 16 is fixedly installed on the bottom of the bottom support plate 1, and there are four universal ball wheels 16, and the four universal ball wheels 16 are symmetrically installed in a rectangular shape at the four corners of the bottom of the bottom support plate 1.

[0032] The waste liquid for debridement can fall downward through the lower hopper 17, then enter the interior of the waste bucket 3 through the feed tube 32, and then fall to the top of the baffle 28. The baffle 28 will be tilted inside the waste bucket 3 due to the impact force of the vomit and the gravity, so that the baffle 28 rotates on the outside of the rotating rod 1 33, and drives the rotating rod 2 34 to rotate, so that the torsion spring 36 is twisted, so that the vomit slides from the top of the baffle 28 to the interior of the waste bucket 3. When there is no vomit on the top of the baffle 28, the torsion spring 36 recovers its deformation, so that the baffle 28 is reset, thereby By shielding the interior of the waste bin 3, the strong and unpleasant odor emitted by vomitus can be greatly reduced from accidentally leaking out of the interior of the waste bin 3, thereby improving the comfort and hygiene of the surrounding environment, and can inhibit the spread of bacteria and viruses to a great extent, thereby significantly reducing the risk of cross-infection of pathogens, creating a safer, healthier and more efficient working environment for medical staff and related personnel. In addition, the filter plate 38 can be used to separate wet and dry vomitus, thereby improving the use effect of the device, and the universal ball wheel 16 is provided to facilitate the movement of the entire device.

[0033] Working principle: first, place the arm with the wound inside the debridement frame 8, and then push the limit seat 9 according to the position of the wound, so that the movable slider 27 moves inside the arc-shaped slide groove 22, so that the installation box 18 moves inside the debridement frame 8, so that the liquid spray head 26 faces the wound position, which is suitable for debridement of wounds at different positions of the arm, greatly improving the accuracy and effectiveness of the debridement process, thereby significantly enhancing the overall use effect, not only improving the work efficiency of medical personnel, but also bringing a more comfortable and safe treatment experience to patients, and then the three liquid pumps 7 can be started The three spray heads 26 are sequentially sprayed with the saline, alcohol and iodine in the liquid tank 5 to the wound of the patient's arm. The saline is used for preliminary cleaning of the wound, the alcohol is further disinfected, and the iodine provides long-term antibacterial protection, which can better clean the wound of the patient and more effectively perform deep-level debridement treatment on the wound of the patient, which not only accelerates the healing process of the wound, but also significantly reduces the risk of infection. In addition, when the wound of the patient is large, the drive motor 19 can be started to move forward and reversely, thereby driving the debridement frame 8 to move back and forth through the support frame 14, so as to clean the wound of the patient. The waste liquid of the wound cleaning can fall downward through the lower hopper 17, then enter the interior of the waste bucket 3 through the feed tube 32, and then fall to the top of the baffle 28. The baffle 28 will be tilted inside the waste bucket 3 by the impact force of the vomit and the gravity, so that the baffle 28 rotates on the outside of the rotating rod 1 33, and drives the rotating rod 2 34 to rotate, so that the torsion spring 36 is twisted, so that the vomit slides from the top of the baffle 28 to the interior of the waste bucket 3. When there is no vomit on the top of the baffle 28, the torsion spring 36 recovers its deformation, so that the baffle 28 Resetting the waste bin 3 to shield the interior of the waste bin 3 can greatly reduce the accidental leakage of the strong and uncomfortable odor emitted by vomit from the interior of the waste bin 3, thereby improving the comfort and hygiene of the surrounding environment, and can inhibit the spread of bacteria and viruses to a great extent, thereby significantly reducing the risk of cross-infection of pathogens, creating a safer, healthier and more efficient working environment for medical staff and related personnel. In addition, the filter plate 38 can be used to separate the wet and dry vomit, thereby improving the use effect of the device, and the universal ball wheel 16 is provided to facilitate the movement of the entire device.

[0034] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A debridement device for general surgery, comprising a bottom support plate (1) and a debridement frame (8), characterized in that: A support rod (4) is fixedly installed on the top of the bottom support plate (1), a top mounting plate (2) is fixedly installed on the top of the support rod (4), a moving frame (13) is fixedly installed on one side of the top of the top mounting plate (2), a limit sliding rod (12) is fixedly installed inside the moving frame (13), a moving frame (20) is fixedly installed on the other side of the top of the top mounting plate (2), a threaded rod (21) is rotatably installed inside the moving frame (20), a driving motor (19) is fixedly installed on one side of the moving frame (20), two support frames (14) are fixedly installed on both sides of the debridement frame (8), and the two support frames (14) on one side of the debridement frame (8) are away from the debridement frame. A threaded hole (24) is provided inside one end of the debridement frame (8); a circular sliding hole (25) is provided inside the two support frames (14) on the other side of the debridement frame (8) away from one end of the debridement frame (8); an arc-shaped sliding groove (22) is provided on the outside of the debridement frame (8); a movable slider (27) is slidably installed inside the arc-shaped sliding groove (22); a limit seat (9) is fixedly installed on the top of the movable slider (27); a mounting box (18) is fixedly installed on the bottom of the movable slider (27); three liquid spray heads (26) are connected to the bottom of the mounting box (18); a liquid tank (5) is fixedly installed on the top of the top mounting plate (2); and three liquid pumps (7) are fixedly installed on the top of the liquid tank (5).

2. A debridement device for general surgery according to claim 1, characterized in that: One end of the two support frames (14) on one side of the debridement frame (8) away from the debridement frame (8) is threadedly connected to the outer side of the threaded rod (21) through a threaded hole (24), and the other end of the two support frames (14) on the other side of the debridement frame (8) away from the debridement frame (8) is slidably installed on the outer side of the limiting slide rod (12) through a circular sliding hole (25), and the output end of the driving motor (19) is fixedly connected to one end of the threaded rod (21).

3. A debridement device for general surgery according to claim 2, characterized in that: Two partitions are fixedly installed inside the liquid box (5), and the two partitions divide the inside of the liquid box (5) into three liquid chambers. The liquid inlet ends of the three liquid pumps (7) are respectively connected to the three liquid chambers through pipelines, and the liquid outlet ends of the three liquid pumps (7) are respectively connected to the three liquid spray heads (26) through pipelines. Three liquid adding holes (6) are opened on the top of the liquid box (5), and the insides of the three liquid adding holes (6) are all equipped with sealing plugs.

4. A debridement device for general surgery according to claim 3, characterized in that: A support block (11) is movably mounted on the top of the top mounting plate (2), an arc placement frame (10) is fixedly mounted on the top of the support block (11), and a rubber pad is fixedly mounted on the inner side of the arc placement frame (10).

5. A debridement device for general surgery according to claim 4, characterized in that: A liquid leakage hole (23) is provided at the bottom of the debridement frame (8).

6. A debridement device for general surgery according to claim 5, characterized in that: The bottom of the top mounting plate (2) is connected to a lower hopper (17).

7. A debridement device for general surgery according to claim 6, characterized in that: A placement groove (37) is provided on the top of the bottom support plate (1), a protective half ring (15) is fixedly installed on the top of the bottom support plate (1), a waste bucket (3) is placed inside the placement groove (37), a baffle (28) is installed inside the waste bucket (3), a mounting groove (35) is provided inside the baffle (28), a rotating rod 2 (34) is fixedly installed inside one end of the mounting groove (35), a rotating rod 1 (33) is rotatably installed inside the other end of the mounting groove (35), a torsion spring (36) is installed inside the mounting groove (35), and two ends of the torsion spring (36) are respectively connected to one end of the rotating rod 2 (34) and one end of the rotating rod 1 (33). One end of the rotating rod 2 (34) away from the torsion spring (36) is rotatably mounted on the inner wall of the waste barrel (3), and one end of the rotating rod 1 (33) away from the torsion spring (36) is fixedly connected to the inner wall of the waste barrel (3). A filter plate (38) is fixedly mounted inside the waste barrel (3). A drainage hole is provided at the bottom of one side of the waste barrel (3), and a rubber plug is installed inside the drainage hole. The top of the waste barrel (3) is connected to a feed barrel (32), and a sealing cover (31) is installed on the top of the feed barrel (32). A ring (30) is rotatably mounted on the outer side of the sealing cover (31), and a connecting rope (29) is fixedly connected between the ring (30) and the waste barrel (3).

8. A debridement device for general surgery according to claim 7, characterized in that: A universal ball wheel (16) is fixedly mounted on the bottom of the bottom support plate (1), and there are four universal ball wheels (16). The four universal ball wheels (16) are symmetrically mounted in a rectangular shape at the four corners of the bottom of the bottom support plate (1).