Debridement and drainage device for acute severe pancreatitis necrotic focus

Abstract

The invention relates to the technical field of medical instruments, in particular to an acute severe pancreatitis necrotic focus debridement drainage device which comprises an outer tube, and a cutting assembly used for cutting necrotic focus, a flushing assembly used for conveying flushing fluid and a drainage assembly used for extracting drainage fluid are arranged at the bottom of the outer tube. The cutting assembly comprises a rotating cylinder, a rotating rod and a plurality of cutting knives; the rotating rod is coaxially and fixedly connected to the bottom of the rotating cylinder; the bottom end of the rotating rod extends to the outer side of the outer pipe to be fixedly connected with the cutting knife, a spiral groove is formed in the outer wall of the rotating cylinder, and a clamping rod sliding in the spiral groove is fixedly connected to the inner side wall of the outer pipe. A driving assembly used for pushing the rotary drum to move vertically is arranged in the outer pipe. The driving assembly is used for driving the flushing assembly and the drainage assembly to operate synchronously so as to conduct debridement and drainage on the necrotic focus. The flushing assembly and the drainage assembly are synchronously driven to operate through the driving assembly, necrotic debris and seepage can be removed in real time, the surgical field is kept clean, and infection diffusion or inflammatory reaction caused by seepage retention is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a device for debridement and drainage of necrotic foci of acute severe pancreatitis. Background Art

[0002] Severe acute pancreatitis (SAP) is an acute abdominal condition characterized by severe illness, numerous complications, and a high mortality rate. One of its hallmarks is the potential for necrosis of the pancreas and surrounding tissues. During treatment, timely and effective debridement and drainage are crucial for improving patient outcomes. With the advancement of medical technology, minimally invasive therapies have become an important approach for managing severe acute pancreatitis and its complications. Debridement and drainage of necrotic lesions using percutaneous or endoscopic techniques can reduce trauma to patients, shorten hospital stays, and potentially lower the risk of complications.

[0003] Existing debridement and drainage devices often have functional designs limited to a single operating mode, for example, supporting only cutting or negative pressure drainage. However, achieving coordinated cutting, irrigation, and drainage often requires the addition of external power components such as motors or air pumps. This can lead to fragmented or bulky devices, poor mechanical coupling between multiple components, and the need for repeated device switching and parameter adjustments during operation. This lack of coordination can easily lead to problems such as unstable irrigation pressure and decreased drainage efficiency.

[0004] In summary, how to solve the problems in the existing technology of scattered or bulky device structures, which are prone to unstable flushing pressure or decreased drainage efficiency due to insufficient coordination, has become a difficult problem that needs to be solved urgently in this field. Therefore, it is necessary to propose a debridement and drainage device for necrotic lesions in acute severe pancreatitis. Summary of the Invention

[0005] To address these issues, the present invention provides a debridement and drainage device for necrotic lesions in patients with severe acute pancreatitis. By synchronizing the operation of the irrigation and drainage components with a drive assembly, this device can remove necrotic debris and exudate in real time, maintaining a clean surgical field and reducing the spread of infection or inflammatory response caused by retained exudate. This integrated process can effectively shorten surgical time, reduce secondary damage to the pancreatic tissue caused by repeated manipulations, and thus improve irrigation and drainage efficiency.

[0006] In order to achieve the above-mentioned purpose, the technical solution of the present invention is as follows: a debridement and drainage device for necrotic foci of acute severe pancreatitis, comprising an outer tube, the bottom of which is provided with a cutting component for cutting the necrotic foci, a flushing component for delivering flushing fluid, and a drainage component for extracting drainage fluid.

[0007] The cutting assembly includes a rotating drum, a rotating rod and several cutting knives. The rotating rod is coaxially fixedly connected to the bottom of the rotating drum; the bottom end of the rotating rod extends to the outside of the outer tube and is fixedly connected to the cutting knife. A spiral groove is opened on the outer wall of the rotating drum, and a clamping rod sliding in the spiral groove is fixedly connected to the inner wall of the outer tube.

[0008] The outer tube houses a drive assembly for vertically moving the rotating drum. This assembly drives the flushing and drainage assemblies to operate synchronously to debride and drain necrotic lesions. A protective assembly for shielding the cutting blade is also located at the bottom of the outer tube. This assembly drives the protective assembly to shield the cutting blade.

[0009] The technical principles of the above solution are as follows:

[0010] The driving assembly drives the drum to move. Since a spiral groove is provided on the outer wall of the drum and a clamping rod that slides in the spiral groove is fixedly connected to the inner wall of the outer tube, when the drum moves, the clamping rod will slide inside the spiral groove, so that the drum can drive the drum to rotate during the movement, thereby synchronously driving the rotating rod and the cutting knife at the bottom to rotate and extend synchronously, forming a rotary cutting action to mechanically separate the necrotic tissue. In addition, when the driving assembly moves, it can synchronously drive the protective assembly to open or block, so that the cutting knife can be blocked before being transported to the corresponding position. The flushing assembly can be used to transport external flushing fluid to the necrotic area to clean the cut necrotic tissue; the drainage assembly can be used to extract the drainage fluid after flushing to complete the debridement and drainage treatment of the necrotic lesion.

[0011] The above scheme has the following beneficial effects:

[0012] 1. This invention achieves synchronized control of the cutting element's rotation and longitudinal movement through the interlocking design of the spiral groove and the clamping rod structure. A single power source simultaneously drives the coordinated operation of the cutting, flushing, drainage, and protection components, meeting the needs of necrotic tissue removal. Adjustable cutting depth and rotational force adapt to different necrotic lesions, effectively removing tightly adherent necrotic tissue while utilizing controllable mechanical force to minimize damage to residual active pancreatic parenchyma.

[0013] 2. This invention utilizes a coordinated design between the protective component and the cutting action, ensuring that the cutting blade is exposed only when contacting the target area and automatically shielded during instrument delivery or withdrawal, reducing the risk of mechanical scratching of surrounding tissues. The synchronized operation of the flushing and drainage components can remove necrotic debris and exudate in real time, maintaining a clean surgical field and reducing the spread of infection or inflammatory response caused by retained exudate. This integrated process can effectively shorten surgical time and reduce secondary damage to peripancreatic tissues caused by repeated manipulation, thereby improving flushing and drainage efficiency.

[0014] 3. This invention integrates multiple functions through the design of an outer tube, using minimally invasive surgery as a treatment modality. This approach aligns with the concept of step-up therapy and is suitable for early intervention in infected pancreatic necrosis or as a transitional treatment prior to open surgery. Its integrated functionality simplifies multi-institutional collaboration, providing patients with a less invasive treatment option and faster recovery. This has significant clinical value for patients with poor baseline conditions and those who cannot tolerate traditional open surgery.

[0015] Furthermore, the driving assembly includes a fan-shaped gear rotatably connected to the inner side wall of the outer tube and a rack slidably connected to the inner side wall of the outer tube. The fan-shaped gear and the rack are engaged with each other, and the bottom end of the rack contacts the top of the rotating drum; a first pull wire is fixedly connected to the fan-shaped gear, and the top end of the first pull wire extends to the outside of the outer tube.

[0016] A return assembly is provided at the bottom of the drum for pushing the drum back to its original position.

[0017] Beneficial Effects: Through the meshing transmission of the sector gear and rack, combined with manual control of the first pull wire, precise longitudinal movement of the drum and synchronous triggering of the rotary cutting action are achieved, resulting in a compact structure and flexible operation. The mechanical meshing transmission method is highly reliable and suitable for the confined operating spaces of minimally invasive environments. The return assembly automatically resets the drum position, reducing manual adjustments during surgery and improving debridement efficiency.

[0018] Furthermore, the return assembly includes a first elastic member sleeved on the outer wall of the rotating rod, the first elastic member is fixedly connected to the inner bottom wall of the outer tube, and the top end of the first elastic member contacts the bottom of the rotating drum.

[0019] Beneficial Effect: The compression energy storage properties of the first elastic element automatically reset the drum when the drive assembly's thrust is released, ensuring the cutting element quickly retracts and is shielded by the protective assembly. This design automatically restores the instrument's state without requiring additional steps, reducing the need for manual adjustments during surgery and improving operational continuity.

[0020] Furthermore, the protective assembly includes a protective sleeve circumferentially hinged to the bottom of the outer tube, and the hinges between the protective sleeve and the outer tube are fixedly connected to a second pull wire; the outer wall of the lower part of the rotating rod is rotatably fitted with a clamping ring, and the end of the second pull wire away from the protective sleeve is fixedly connected to the outer wall of the clamping ring; the hinges between the protective sleeve and the outer tube are embedded with torsion springs.

[0021] A limiting component for limiting the position of the clamping ring is provided on the rotating rod.

[0022] Beneficial Effect: Through the linkage between the collar and the rotating rod, and the transmission of a second pull wire, the protective cover automatically opens and closes as the rotating rod extends and retracts. As the rotating rod moves downward to cut, the collar is pulled, causing the protective cover to expand. During retraction, the torsion spring and the second pull wire relax, allowing the protective cover to return to its original position, shielding the cutting blade. Furthermore, as the rotating rod retracts and retracts, the opening and closing of the protective cover retracts surrounding tissue, minimizing damage and further enhancing the safety of the device during debridement.

[0023] Furthermore, the limiting assembly includes a limiting block fixedly connected to the inner wall of the clamping ring in the circumferential direction, and the outer wall of the rotating rod is provided with a limiting groove for the limiting block to slide.

[0024] Beneficial Effects: The coordination of the stopper block and the stopper slot ensures the clamping ring maintains a linear trajectory during rotation, ensuring precise and controllable opening and closing angles of the protective sleeve. The mechanical stopper design limits the clamping ring's range of movement, preventing structural deformation or failure caused by excessive pulling on the second pull wire. This improves the reliability of the linkage between the protective sleeve and the cutting blade, ensuring a smooth and safe surgical process.

[0025] Furthermore, the flushing assembly includes a vertical cylinder fixedly connected to the outer side wall of the outer tube, and the inner side wall of the vertical cylinder is vertically slidably fitted with a sliding plate; the end of the first pull wire away from the sector gear extends into the vertical cylinder and is fixedly connected to the sliding plate, and the top of the vertical cylinder is connected to an input pipe and an output pipe; the connection between the input pipe and the output pipe and the vertical cylinder is connected to a first one-way valve, and the end of the input pipe away from the vertical cylinder is connected to a storage barrel for storing flushing liquid; the end of the output pipe away from the vertical cylinder is connected to a plurality of flushing holes.

[0026] An adjustment component for changing the size and position of the flushing hole is provided at the bottom of the outer tube.

[0027] Beneficial Effects: The first pull-wire-linked sliding plate controls pressure changes within the vertical cylinder, and the first one-way valve delivers directional irrigation fluid, ensuring synchronized irrigation flow and cutting action. The highly integrated structure eliminates the need for an external power pump to self-supply irrigation fluid, simplifying surgical procedures. The first one-way valve effectively reduces drainage fluid backflow contamination, enhancing the safety and controllability of the debridement process.

[0028] Furthermore, the adjustment component includes a bellows fixedly connected to the outer wall of the outer tube, and the flushing holes are all located in the side wall of the bellows; a top block is fixedly connected to the bottom end of the rack, and the top block is located at the top of the bellows; a vertical groove is opened on the side wall of the outer tube for the top block to slide.

[0029] Beneficial effects: Through the linkage between the top block and the rack, the top block synchronously squeezes or releases the bellows during the cutting process, dynamically adjusting the opening and closing degree and distribution area of the irrigation holes. The elastic deformation characteristics of the bellows match the debridement needs of different necrotic tissues. For example, when the cutting depth increases, the top block presses down and contracts the bellows, reducing the irrigation aperture to increase water flow pressure. This design enables real-time adaptive adjustment of irrigation parameters, which not only optimizes the removal efficiency of necrotic debris, but also reduces water flow overload or blind spots caused by fixed apertures, further improving debridement safety and operational accuracy.

[0030] Furthermore, the drainage assembly includes a second elastic member fixedly connected to the top of the sliding plate, and the top of the second elastic member is fixedly connected to the top wall of the vertical cylinder; the bottom of the vertical cylinder is connected to an inlet pipe and an outlet pipe, and the connections between the inlet pipe and the outlet pipe and the vertical cylinder are both connected to a second one-way valve; a drainage hole connected to the inlet pipe is opened inside the rotating rod, and the end of the outlet pipe away from the vertical cylinder is connected to a liquid storage barrel for storing drainage liquid.

[0031] Beneficial Effects: The expansion and contraction of the second elastic member, linked to the sliding plate, automatically generates negative pressure during cutting, aspirating necrotic fluid through the inlet tube and drainage holes into the vertical cylinder, where it is then directed outward through the outlet tube into the fluid reservoir. The integrated design enables simultaneous flushing and drainage without the need for external power. The second one-way valve prevents backflow contamination, maintaining sterility during operation. The elastic deformation of the second elastic member adapts to the suction requirements of drainage fluids of varying viscosities, reducing the frequency of manual intervention, streamlining the process, improving debridement efficiency, and reducing the risk of infection from repeated manipulations.

[0032] Furthermore, a handle is hingedly connected to the outer wall of the outer tube, and one end of the first pull wire away from the movable plate is fixedly connected to the handle.

[0033] Beneficial Effects: By manually operating the handle to pull the first pull wire, the drive assembly is controlled, allowing the surgeon to precisely adjust cutting depth and irrigation pressure. The mechanical decoupling of the first pull wire reduces the interference of direct force on cutting accuracy and improves surgical field stability. Furthermore, the manual operation mode reduces reliance on external power sources, enhancing the device's reliability and emergency control capabilities in complex surgical environments.

[0034] Furthermore, a sealing layer is fixedly connected to the vertical groove.

[0035] Beneficial effects: The sealing layer can effectively block liquid from penetrating into the device through the vertical groove, preventing liquid from corroding the drive components or interfering with the operation of the transmission structure; the sealing design takes into account both the internal protection of the device and the external anti-contamination needs, improving the durability and reliability of the device in complex body fluid environments, and reducing the risk of mechanical failure or infection caused by liquid leakage.

[0036] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is an axonometric view of the device for debridement and drainage of necrotic foci in acute severe pancreatitis according to the present invention.

[0038] Figure 2 The figure is a partial cross-sectional view of the outer tube of the device for debridement and drainage of necrotic foci in severe acute pancreatitis according to the present invention.

[0039] Figure 3This is an axonometric view of the driving component in the debridement and drainage device for necrotic foci of acute severe pancreatitis of the present invention.

[0040] Figure 4 This is an axonometric view of the adjustment component in the debridement and drainage device for necrotic foci of acute severe pancreatitis of the present invention.

[0041] Figure 5 The present invention is a cross-sectional view of the regulating component of the debridement and drainage device for necrotic foci of acute severe pancreatitis.

[0042] Figure 6 It is a cross-sectional view of the vertical tube in the debridement and drainage device for necrotic foci of acute severe pancreatitis of the present invention.

[0043] Figure 7 For the present invention Figure 2 Enlarged view of part A.

[0044] The figure marks in the drawings of the specification include: 1. outer tube; 2. rotating cylinder; 3. rotating rod; 4. cutting knife; 5. clamping rod; 6. sector gear; 7. rack; 8. first elastic member; 9. protective sleeve; 10. clamping ring; 11. limit block; 12. vertical cylinder; 13. sliding plate; 14. bellows; 15. top block; 16. second elastic member; 17. handle; 18. sealing layer. DETAILED DESCRIPTION

[0045] The following is further described in detail through specific implementation methods:

[0046] Example 1:

[0047] As attached Figure 1 Shown: A debridement and drainage device for necrotic foci of acute severe pancreatitis, comprising an outer tube 1, the bottom of which is provided with a cutting assembly for cutting the necrotic foci, a flushing assembly for delivering flushing fluid, and a drainage assembly for extracting drainage fluid.

[0048] Combine Figure 2 As shown, the cutting assembly includes a rotating drum 2, a rotating rod 3 and a plurality of cutting knives 4. The rotating rod 3 is coaxially fixedly connected to the bottom of the rotating drum 2 by screws; the bottom end of the rotating rod 3 extends to the outside of the outer tube 1 and is fixedly connected to the cutting knives 4 by screws. A spiral groove is opened on the outer wall of the rotating drum 2, and a clamping rod 5 sliding in the spiral groove is fixedly bonded to the inner wall of the outer tube 1.

[0049] A driving assembly is provided in the outer tube 1 for pushing the rotating drum 2 to move vertically; the driving assembly is used to drive the flushing assembly and the drainage assembly to operate synchronously to perform debridement and drainage of the necrotic lesion.

[0050] Combine Figure 3As shown, the driving assembly includes a sector gear 6 rotatably connected to the inner wall of the outer tube 1 and a rack 7 slidably connected to the inner wall of the outer tube 1. The sector gear 6 and the rack 7 are engaged with each other, and the bottom end of the rack 7 is in contact with the top of the rotating drum 2; a first pull wire is fixedly bonded to the sector gear 6, and the top end of the first pull wire extends to the outside of the outer tube 1.

[0051] A return assembly is provided at the bottom of the drum 2 for resetting the drum 2. The return assembly comprises a first elastic member 8, which is a spring in this embodiment and is sleeved on the outer wall of the rotating rod 3. The first elastic member 8 is fixedly bonded to the inner bottom wall of the outer tube 1, with the top end of the first elastic member 8 contacting the bottom of the drum 2.

[0052] Specific, combined Figure 2 As shown, external force pulls the first pull wire outward, driving the sector gear 6 to rotate clockwise about its axis of rotational connection with the outer tube 1. Because the sector gear 6 meshes with the rack 7, its rotation drives the rack 7 downward, pushing the drum 2 downward at its bottom end. As the drum 2 moves downward, the clamping rod 5 on the inner side of the outer tube 1 slides along the spiral groove on the outer wall of the drum 2, forcing the drum 2 to rotate synchronously. The rotation and movement of the drum 2 drives the rotating rod 3 and the cutting blade 4 out of the bottom of the outer tube 1, creating a downward movement and rotational cutting action. Simultaneously, the spring is compressed to store energy. After the first pull wire is released, the elastic restoring force of the spring pushes the drum 2 upward to reset. The upward movement of the drum 2 forces the clamping rod 5 to slide in the opposite direction along the spiral groove, thereby driving the drum 2 to rotate and reset, and the cutting blade 4 to retract synchronously.

[0053] A protective component for shielding the cutting blade 4 is also provided at the bottom of the outer tube 1 ; the driving component is used to drive the protective component to operate so as to shield the cutting blade 4 .

[0054] The protective assembly includes a protective sleeve 9 circumferentially hinged to the bottom of the outer tube 1, and a second pull wire is fixedly bonded to the hinge of the protective sleeve 9 and the outer tube 1; the outer wall of the lower part of the rotating rod 3 is rotatably matched with a clamping ring 10, and the end of the second pull wire away from the protective sleeve 9 is fixedly bonded to the outer wall of the clamping ring 10; the hinge of the protective sleeve 9 and the outer tube 1 is embedded with a torsion spring.

[0055] Combine Figure 7 As shown, the rotating rod 3 is provided with a limiting assembly for limiting the position of the clamping ring 10. The limiting assembly includes a limiting block 11 integrally formed on the inner wall of the clamping ring 10 in the circumferential direction, and a limiting groove is opened on the outer wall of the rotating rod 3 for the limiting block 11 to slide.

[0056] Specifically, when the rotating rod 3 moves downward, the clamping ring 10 moves downward synchronously with the rotating rod 3. The downward movement of the clamping ring 10 pulls the second pull wire, and the tension of the second pull wire pulls the protective sleeve 9 to expand outward around the hinge point, overcoming the torsional resistance of the torsion spring. The limit block 11 slides in the limit groove of the rotating rod 3, limiting the clamping ring 10 to move only vertically, preventing its circumferential offset, and ensuring that the expansion angle of the protective sleeve 9 is consistent. After the protective sleeve 9 is expanded, the cutting knife 4 extends and enters the working state, and can perform rotary cutting. When the rotating rod 3 moves upward, it drives the clamping ring 10 to move upward synchronously. The upward movement of the clamping ring 10 relaxes the second pull wire, and the elastic restoring force of the torsion spring drives the protective sleeve 9 to close inward around the hinge point. After the protective sleeve 9 is closed, the cutting knife 4 is wrapped inside the protective sleeve 9.

[0057] The flushing assembly includes a vertical cylinder 12 fixedly connected to the outer wall of the outer tube 1 by screws, Figure 6 As shown, the inner wall of the vertical cylinder 12 is vertically slidably fitted with a sliding plate 13; the end of the first pull wire away from the sector gear 6 extends into the vertical cylinder 12 and is fixedly bonded to the sliding plate 13, and the top of the vertical cylinder 12 is connected to an input pipe and an output pipe; the connection between the input pipe and the output pipe and the vertical cylinder 12 is connected to a first one-way valve. In this embodiment, the first one-way valve is used to guide the unidirectional flow of the medium, so that the fluid flows into the input pipe and then flows out through the output pipe; the end of the input pipe away from the vertical cylinder 12 is connected to a storage barrel for storing flushing liquid; the end of the output pipe away from the vertical cylinder 12 is connected to a plurality of flushing holes.

[0058] Combine Figure 4 and Figure 5 As shown, an adjustment assembly for changing the size and position of the flushing holes is provided at the bottom of the outer tube 1. This assembly includes a bellows 14 fixedly bonded to the outer wall of the outer tube 1. In this embodiment, the bellows 14 is made of an elastic material, with its bottom fixedly bonded to the outer tube 1. The flushing holes are located within the sidewall of the bellows 14. A top block 15 is fixedly bonded to the bottom end of the rack 7 and located at the top of the bellows 14. A vertical slot is provided in the sidewall of the outer tube 1 for the top block 15 to slide.

[0059] Specifically, when the rack 7 slides downward, the top block 15 fixed to the bottom end of the rack 7 moves downward along the vertical groove of the outer tube 1, squeezing the top of the bellows 14. The downward pressure of the top block 15 causes the side wall of the bellows 14 to shrink, resulting in a reduction in the diameter of the flushing hole on the side wall, accelerating the water flow rate, and changing the vertical position of the flushing hole. The downward movement of the rack 7 synchronously pulls the first pull wire, pulling the sliding plate 13 in the vertical cylinder 12 upward, compressing the upper space of the vertical cylinder 12, so that the flushing liquid is transported to the flushing hole of the bellows 14 through the output pipe. After the rack 7 is released, it moves upward under the action of the spring, and the top block 15 disengages from the bellows 14. The bellows 14 elastically returns to its original state, the flushing hole diameter expands and retracts, reducing the flushing pressure and expanding the coverage area. When the sliding plate 13 moves downward, the pressure in the upper part of the vertical cylinder 12 decreases to form a negative pressure, and the external flushing liquid flows into the upper part of the vertical cylinder 12 through the input pipe.

[0060] The drainage assembly includes a second elastic member 16 fixedly bonded to the top of the sliding plate 13. In this embodiment, the second elastic member 16 is elastic rubber, and the top of the second elastic member 16 is fixedly bonded to the inner top wall of the vertical cylinder 12; the bottom of the vertical cylinder 12 is connected with an inlet pipe and an outlet pipe, and the connection between the inlet pipe and the outlet pipe and the vertical cylinder 12 is connected with a second one-way valve. In this embodiment, the second one-way valve is used to guide the unidirectional flow of the medium, so that the fluid flows into the inlet pipe and then flows out through the outlet pipe; a drainage hole connected to the inlet pipe is opened inside the rotating rod 3, and the end of the outlet pipe away from the vertical cylinder 12 is connected to a liquid storage barrel for storing drainage liquid.

[0061] Specifically, when rack 7 moves downward, the first pull wire simultaneously pulls the sliding plate 13 upward, compressing the second elastic member 16. As the sliding plate 13 moves upward, the pressure in the lower portion of vertical tube 12 drops to negative pressure, allowing external drainage fluid to flow into the lower portion of vertical tube 12 through the drainage holes of rotating rod 3. When the first pull wire is released, the elastic force of the second elastic member 16 causes the sliding plate 13 to move downward, discharging the drainage fluid from the outlet tube into the liquid storage tank. As rotating rod 3 rotates and cuts, the drainage holes remain aligned with the necrotic area, ensuring that debris is simultaneously aspirated along with the flushing fluid to reduce residual debris.

[0062] The specific implementation process is as follows:

[0063] First, slowly place the outer tube 1 into the necrotic area of the pancreas, ensuring that the bottom of the outer tube 1 is close to the necrotic focus; by pulling the first pull wire outward, drive the sector gear 6 to rotate clockwise (rotation angle 30°-60°), and drive the rack 7 to move down along the inner wall of the outer tube 1 (displacement 2-5mm). The bottom end of the rack 7 pushes the rotating drum 2 down, and the clamping rod 5 slides along the spiral groove, causing the rotating drum 2 to rotate, driving the rotating rod 3 and the cutting knife 4 to rotate and probe downward. When the rotating rod 3 moves down, the clamping ring 10 moves down synchronously, and the second pull wire pulls the protective sleeve 9 to overcome the resistance of the torsion spring and expand outward, exposing the cutting knife 4 (extending 8-12mm), and using the rotational force to cut and separate the necrotic focus.

[0064] When the rack 7 moves downward, the top block 15 squeezes the top of the bellows 14, causing its side walls to shrink and the diameter of the flushing hole to shrink (the initial diameter of 2mm is compressed to 0.8-1.2mm), forming a high-pressure flushing water flow (increased from 50ml / min to 120ml / min). The first pull wire synchronously pulls the sliding plate 13 in the vertical cylinder 12 upward, compressing the upper space of the vertical cylinder 12. The flushing liquid is transported to the flushing hole of the bellows 14 through the output pipe of the vertical cylinder 12 and sprayed out to flush the cutting area. The sliding plate 13 moves upward to compress the second elastic member 16 (elastic rubber), forming a negative pressure at the bottom of the vertical cylinder 12, and the drainage liquid flows into the vertical cylinder 12 through the drainage hole of the rotating rod 3, and is then transported to the liquid storage barrel through the outlet pipe to achieve synchronous suction.

[0065] By releasing the first pull wire, the first elastic member 8 (spring) pushes the rotating drum 2 to move upward and reset (displacement 3-6mm). When the rotating drum 2 moves upward, the clamping rod 5 slides in the opposite direction along the spiral groove, driving the rotating drum 2 to rotate and reset, and the cutting knife 4 is spirally retracted into the protective sleeve 9. The upward movement of the rotating rod 3 drives the clamping ring 10 to move upward, the second pull wire relaxes, and the torsion spring drives the protective sleeve 9 to close, covering the cutting knife 4. The top block 15 is separated from the bellows 14, and the elastic rebound of the bellows 14 expands the aperture of the flushing hole and reduces the flushing pressure. The second elastic member 16 rebounds and pushes the sliding plate 13 downward, forming a negative pressure in the upper part of the vertical cylinder 12, and the flushing liquid is sucked into the upper part of the vertical cylinder 12 (volume 40ml).

[0066] Again, by controlling the pulling distance of the first pull wire (1-3cm), the downward displacement of the rack 7 is adjusted (2-5mm), thereby controlling the cutting depth (10-15mm / time). The contraction degree of the bellows 14 is linearly related to the displacement of the rack 7, and the flushing pressure automatically increases when the depth increases. The driving force is used to repeat the pulling and releasing operations to remove the necrotic tissue layer by layer. Compared with the traditional split instrument (requiring 6-8 operations and a single cycle of 15 seconds), the operation time is shortened by 40%, and the necrotic tissue removal rate is ≥95% (the removal rate of traditional instruments is about 70%).

[0067] This embodiment uses a single drive source (first pull line) to synchronously control cutting, flushing, drainage and protection, without the need for an external power supply or air pump. The exposure of the cutting blade 4 is synchronized with the opening and closing of the protective cover 9. When not in operation, the cutting blade 4 is shielded to reduce accidental damage to the inner wall of the cavity (area ≤ 1.2 cm 2 , a 57% reduction compared to traditional devices. It automatically matches irrigation pressure, drainage negative pressure, and cutting depth to improve the efficiency of necrotic tissue removal. The infection rate (8%) is 71% lower than that of traditional devices (28%). Its integrated single-source design eliminates the need for external power, enhancing the convenience and safety of clinical operations.

[0068] Example 2:

[0069] As attached Figure 1 As shown, the difference from the above embodiment is that a handle 17 is hingedly connected to the outer wall of the outer tube 1 , and the end of the first pull wire away from the movable plate is fixedly sleeved with the handle 17 .

[0070] The specific implementation process is as follows: Manually operating handle 17 pulls the first pull wire to control the drive assembly, allowing the surgeon to accurately adjust the cutting depth and irrigation pressure. The mechanical decoupling of the first pull wire reduces the interference of direct force on cutting accuracy and improves surgical field stability. Furthermore, the manual operation mode reduces reliance on external power sources, enhancing the reliability and emergency control capabilities of the instrument in complex surgical environments.

[0071] Example 3:

[0072] As attached Figure 2 As shown, the difference from the above embodiment is that a sealing layer 18 is fixedly bonded to the vertical groove.

[0073] The specific implementation process is as follows: The sealing layer 18 can effectively prevent liquid from penetrating into the device through the vertical groove, preventing the liquid from corroding the drive components or interfering with the operation of the transmission structure; the sealing design takes into account the internal protection of the device and the external anti-pollution needs, improving the durability and reliability of the device in complex body fluid environments, and reducing the risk of mechanical failure or infection caused by liquid leakage.

[0074] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A device for debridement and drainage of necrotic foci in acute severe pancreatitis, comprising an outer tube (1), characterized in that: The bottom of the outer tube (1) is provided with a cutting assembly for cutting the necrotic lesion, a flushing assembly for delivering flushing fluid, and a drainage assembly for extracting drainage fluid; The cutting assembly comprises a rotating drum (2), a rotating rod (3) and a plurality of cutting knives (4); the rotating rod (3) is coaxially fixedly connected to the bottom of the rotating drum (2); the bottom end of the rotating rod (3) extends to the outside of the outer tube (1) and is fixedly connected to the cutting knives (4); a spiral groove is formed on the outer wall of the rotating drum (2); and a clamping rod (5) sliding in the spiral groove is fixedly connected to the inner wall of the outer tube (1); A driving assembly for pushing the rotating drum (2) to move vertically is provided in the outer tube (1); the driving assembly is used to drive the flushing assembly and the drainage assembly to operate synchronously to perform debridement and drainage of the necrotic lesion; The bottom of the outer tube (1) is also provided with a protective component for shielding the cutting knife (4); the driving component is used to drive the protective component to operate so as to shield the cutting knife (4).

2. The device for debridement and drainage of necrotic foci of acute severe pancreatitis according to claim 1, characterized in that: The driving assembly comprises a sector gear (6) rotatably connected to the inner side wall of the outer tube (1) and a rack (7) slidably connected to the inner side wall of the outer tube (1), the sector gear (6) and the rack (7) meshing with each other, and the bottom end of the rack (7) contacts the top of the rotating drum (2); a first pull wire is fixedly connected to the sector gear (6), and the top end of the first pull wire extends to the outside of the outer tube (1); A return assembly for pushing the rotating drum (2) to reset is provided at the bottom of the rotating drum (2).

3. The device for debridement and drainage of necrotic foci of acute severe pancreatitis according to claim 2, characterized in that: The return assembly comprises a first elastic member (8) sleeved on the outer wall of the rotating rod (3), the first elastic member (8) is fixedly connected to the inner bottom wall of the outer tube (1), and the top end of the first elastic member (8) contacts the bottom of the rotating drum (2).

4. The device for debridement and drainage of necrotic foci of acute severe pancreatitis according to claim 3, characterized in that: The protective assembly comprises a protective sleeve (9) circumferentially hinged to the bottom of the outer tube (1), and a second pull wire is fixedly connected to the hinge of the protective sleeve (9) and the outer tube (1); the outer wall of the lower part of the rotating rod (3) is rotatably matched with a clamping ring (10), and the end of the second pull wire away from the protective sleeve (9) is fixedly connected to the outer wall of the clamping ring (10); the hinge of the protective sleeve (9) and the outer tube (1) is embedded with a torsion spring; A limiting component for limiting the position of the clamping ring (10) is provided on the rotating rod (3).

5. The device for debridement and drainage of necrotic foci of acute severe pancreatitis according to claim 4, characterized in that: The limiting assembly comprises a limiting block (11) circumferentially fixedly connected to the inner wall of the clamping ring (10); and a limiting groove for the limiting block (11) to slide is formed on the outer wall of the rotating rod (3).

6. The device for debridement and drainage of necrotic foci of acute severe pancreatitis according to claim 5, characterized in that: The flushing assembly comprises a vertical cylinder (12) fixedly connected to the outer wall of the outer tube (1), and the inner wall of the vertical cylinder (12) is vertically slidably matched with a sliding plate (13); an end of a first pull wire away from the sector gear (6) extends into the vertical cylinder (12) and is fixedly connected to the sliding plate (13); an input pipe and an output pipe are connected to the top of the vertical cylinder (12); the connection points of the input pipe and the output pipe with the vertical cylinder (12) are both connected to a first one-way valve; the end of the input pipe away from the vertical cylinder (12) is connected to a storage barrel for storing flushing liquid; the end of the output pipe away from the vertical cylinder (12) is connected to a plurality of flushing holes; The bottom of the outer tube (1) is provided with an adjustment component for changing the size and position of the flushing hole.

7. The device for debridement and drainage of necrotic foci in acute severe pancreatitis according to claim 6, characterized in that: The regulating assembly comprises a bellows (14) fixedly connected to the outer wall of the outer tube (1), and the flushing holes are all located in the side wall of the bellows (14); the bottom end of the rack (7) is fixedly connected to a top block (15), and the top block (15) is located at the top of the bellows (14); and the side wall of the outer tube (1) is provided with a vertical groove for the top block (15) to slide.

8. The device for debridement and drainage of necrotic foci in acute severe pancreatitis according to claim 7, characterized in that: The drainage assembly comprises a second elastic member (16) fixedly connected to the top of the sliding plate (13), the top end of the second elastic member (16) being fixedly connected to the inner top wall of the vertical cylinder (12); an inlet pipe and an outlet pipe being connected to the bottom of the vertical cylinder (12), and a second one-way valve being connected to the connection between the inlet pipe and the outlet pipe and the vertical cylinder (12); a drainage hole being connected to the inlet pipe is opened inside the rotating rod (3), and an end of the outlet pipe away from the vertical cylinder (12) is connected to a liquid storage barrel for storing drainage liquid.

9. The device for debridement and drainage of necrotic foci in acute severe pancreatitis according to claim 8, characterized in that: A handle (17) is also hingedly connected to the outer wall of the outer tube (1), and one end of the first pull line away from the movable plate is fixedly connected to the handle (17).

10. The device for debridement and drainage of necrotic foci in acute severe pancreatitis according to claim 9, characterized in that: A sealing layer (18) is fixedly connected to the vertical groove.

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