An internal hydraulic dilator for arthroscopic surgery

Abstract

The application relates to the technical field of surgical dilation, and discloses an internal hydraulic dilator for arthroscopic surgery, which comprises a supporting frame, a hydraulic dilation assembly, a plurality of elastic dilation assemblies, a reciprocating motion assembly and a dynamic pushing assembly. The plurality of elastic dilation assemblies are divided into at least two groups, each group comprises at least one elastic dilation assembly, the two groups of elastic dilation assemblies are oppositely arranged on the hydraulic dilation assembly, and the hydraulic dilation assembly can drive the two groups of elastic dilation assemblies to relatively approach or move away from each other so as to dilate or contract a wound; the reciprocating motion assembly is used for driving the dynamic pushing assembly to make reciprocating linear motion, the dynamic pushing assembly sequentially pushes the elastic dilation assemblies on the same side, and each elastic dilation assembly sequentially separates from the adhesion with a wound tissue. The application solves the technical problem that the existing dilator cannot easily meet the use requirement of long-time arthroscopic surgery.

Description

Technical Field

[0001] This invention relates to the field of surgical dilation technology, specifically to an internal hydraulic dilator for arthroscopic surgery. Background Technology

[0002] Arthroscopic surgery is one of the minimally invasive surgical procedures for treating joint diseases and injuries. The built-in hydraulic dilator is inserted directly into the joint cavity through a minimally invasive incision. Driven by hydraulic pressure, it smoothly expands the joint capsule and surrounding soft tissues, creating a clear surgical field and operating space within a narrow cavity. It is widely applicable to arthroscopic procedures on the knee, shoulder, and ankle, and is an essential piece of equipment to ensure the precise execution of surgeries such as meniscus repair and cruciate ligament reconstruction.

[0003] The expansion structure inside current built-in hydraulic expanders is usually rigidly fixed. During long-term continuous expansion, the soft tissue will be subjected to continuous concentrated pressure, which can easily cause local blood circulation disorders and tissue ischemia and hypoxia. Therefore, it is not easy to meet the needs of long-term arthroscopic surgery.

[0004] To address the above issues, there is an urgent need in this field for an internal hydraulic dilator that can meet the requirements of long-term arthroscopic surgery. Summary of the Invention

[0005] The purpose of this invention is to provide an internal hydraulic dilator for arthroscopic surgery, which solves the problem that, in the above-mentioned case, the internal hydraulic dilator causes continuous concentrated pressure on the soft tissue during prolonged expansion, which can easily lead to local blood circulation disorders and tissue ischemia and hypoxia, and therefore does not meet the requirements of long-term arthroscopic surgery.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An internal hydraulic dilator for arthroscopic surgery, comprising Support frame; A hydraulic expansion assembly is mounted on the support frame; A plurality of elastic expansion components, the plurality of elastic expansion components being divided into at least two groups, and each group including at least one elastic expansion component, the two groups of elastic expansion components being disposed opposite to the hydraulic expansion component, the hydraulic expansion component being able to drive the two groups of elastic expansion components to move closer or further apart relative to each other, so as to expand or contract the wound; A reciprocating motion component is disposed on the hydraulic expansion component; A dynamic pushing component is connected to the reciprocating motion component and fits against the elastic expansion component; The reciprocating motion component is used to drive the dynamic pushing component to perform reciprocating linear motion, so that the dynamic pushing component sequentially pushes the elastic expansion component on the same side, thereby realizing that each elastic expansion component sequentially detaches from the adhesion of the wound tissue.

[0008] Furthermore, the hydraulic expansion assembly includes: A fixed base is fixedly connected to the support frame; A dual-axis hydraulic cylinder is installed inside the fixed base; Two expansion plates are fixedly connected to the two output ends of the dual-axis hydraulic cylinder, respectively; Two movable frames are fixedly connected to two expansion plates respectively, and slidably connected to the fixed base; Two sets of elastic expansion components are respectively set on the two moving frames.

[0009] Furthermore, the elastic expansion component includes: A fixed cylinder is fixedly connected to the movable frame; A first spring is disposed inside the fixed cylinder; A limiting block is fixedly connected to one end of the first spring, and the limiting block is slidably connected to the fixed cylinder; The movable plate is slidably disposed inside the fixed cylinder and connected to the first spring; The first rotating column is rotatably connected to one end of the movable plate; An expansion rod, fixedly connected to one end of the movable plate, is used to contact the wound tissue.

[0010] Furthermore, the reciprocating motion component includes: A servo motor is mounted on the moving frame; A threaded rod is fixedly connected to the output end of the servo motor; The T-shaped threaded block is threadedly connected to the threaded rod and slidably connected to the movable frame. The slide bar is fixedly connected within the movable frame and slidably connected to the T-shaped threaded block.

[0011] Furthermore, the dynamic actuation component includes: The push block is fixedly connected to the T-shaped threaded block; An inclined surface is provided on the push block for contacting and pushing the elastic expansion component.

[0012] Furthermore, it also includes: A guide component is slidably mounted on the reciprocating motion component; A liquid extraction assembly is disposed on the hydraulic expansion assembly and is rotatably connected to the guide assembly; A drainage and anti-sticking component is disposed within the elastic expansion component and communicates with the liquid extraction component; During the movement of the reciprocating motion component, before the dynamic pushing component pushes the corresponding elastic expansion component away from the wound, the guiding component pushes and pulls the aspiration component, so that the liquid in the aspiration component seeps out through the drainage and anti-adhesion component to the contact surface between the elastic expansion component and the wound tissue.

[0013] Furthermore, the guiding component includes: The guide block is slidably connected to the reciprocating motion component; Two transverse grooves are formed opposite to each other on the guide block; An arc-shaped groove is formed on the guide block, and the two sides of the arc-shaped groove are respectively connected to the two transverse grooves.

[0014] Furthermore, the liquid extraction assembly includes: A liquid storage cylinder is fixedly mounted on the hydraulic expansion assembly; The first liquid outlet pipe is connected to the end of the liquid storage cylinder; The second liquid outlet pipe is connected to the first liquid outlet pipe and is fixedly connected to the hydraulic expansion assembly; The liquid extraction frame is fixedly installed inside the hydraulic expansion assembly; A push-pull rod is slidably mounted on the liquid extraction frame. One end of the rod is provided with a second rotating column that cooperates with the arc-shaped groove, and the other end is provided with a piston. The piston is slidably mounted inside the liquid extraction frame.

[0015] Furthermore, the drainage and anti-sticking component includes a liquid passage connecting the contact surface of the suction frame and the expansion rod.

[0016] Furthermore, it also includes an elastic positioning component disposed within the guide component for engaging with the reciprocating motion component; The elastic positioning component includes: A sliding column is slidably connected within the guide assembly; A second spring is disposed between the sliding post and the guide assembly; A ball bearing is tactilely connected to one end of the sliding column and is used to engage with the reciprocating motion component.

[0017] The beneficial effects of this invention are achieved through the following technical features: Through the cooperation between the hydraulic expansion component and the elastic expansion component, the wound of arthroscopic surgery can be expanded smoothly and evenly. The elastic structure can adapt to the difference in the hardness of the wound tissue, allowing the expansion component to fit evenly with the tissue, dispersing the expansion pressure, and avoiding local stress concentration and tissue compression damage caused by rigid expansion. Through the cooperation between the reciprocating motion component and the dynamic pushing component, the expansion rod can be driven to achieve individual intermittent disengagement and repositioning. While maintaining the overall expansion space, it provides dynamic decompression for the wound tissue, restores local blood circulation, and avoids tissue ischemia and hypoxia caused by prolonged continuous expansion. By setting up the guide component and the elastic positioning component, it can provide precise guidance and reliable positioning for reciprocating motion. With the help of the U-shaped push rod, it can achieve flexible position switching, ensure the precise timing of the liquid suction action, avoid component movement deviation or jamming, and ensure the stable operation of dynamic pressure reduction and anti-adhesion functions. By working together with the fluid aspiration component and the fluid drainage anti-adhesion component, physiological saline can be evenly delivered to the contact surface between the expansion component and the tissue, forming a liquid isolation layer. This prevents the expansion component from adhering to the wound tissue at the source, prevents secondary damage caused by pulling on the tissue when the component detaches, and enhances the tissue protection effect during the operation.

[0018] Compared with the prior art, the built-in hydraulic dilator for arthroscopic surgery provided by the present invention has the following significant advantages: 1. Effectively reduces the risk of tissue compression damage and improves the stability and uniformity of expansion. The expansion rod of this invention contacts the tissue through a built-in elastic element (first spring), which can adapt to the hardness differences of soft tissue in different areas of the surgical wound, so that the expansion pressure can be evenly distributed. This avoids the local stress concentration and compressive damage caused by the inability of traditional rigid expansion structures to adapt to tissue differences, thereby providing a more stable, precise and controllable operating space for arthroscopic surgery.

[0019] 2. This innovative approach achieves dynamic intermittent decompression, effectively preventing tissue ischemia and hypoxia caused by prolonged surgery. A drive and transmission mechanism comprised of a servo motor, threaded rods, T-shaped threaded blocks, and a ramp-shaped pusher block allows for the sequential, intermittent, and brief disengagement of multiple expansion rods from the tissue. This mechanism provides a periodic window for blood circulation recovery in the continuously compressed local soft tissue without affecting the overall surgical field of view or operating space. It fundamentally solves the problem of tissue blood supply obstruction easily caused by prolonged constant expansion in existing techniques, significantly improving surgical safety, and is particularly suitable for complex arthroscopic surgeries with long operating times.

[0020] 3. It proactively prevents tissue adhesion and avoids secondary damage during the withdrawal of the dilator. This invention integrates a fluid infusion system consisting of a guide block, a suction frame, a piston, and tubing. This system works in conjunction with a dynamic decompression mechanism to precisely deliver and evenly infiltrate the contact surface between the dilator and the tissue before each dilator is detached, forming an effective fluid isolation layer. This design physically prevents the dilator from adhering to the wound tissue, ensuring that the dilator will not pull or tear the tissue during dynamic repositioning or final withdrawal, providing additional tissue protection.

[0021] 4. High degree of synergy among functional components ensures precise and reliable operation. The coordination between the guiding component and the elastic positioning component (sliding column, second spring, ball bearing) provides precise guidance and reliable staged positioning for reciprocating motion. The position switching function, combined with the U-shaped push rod, ensures strict timing matching and seamless connection between fluid infusion (anti-adhesion) and dynamic decompression actions. The entire system operates smoothly and precisely, effectively avoiding component jamming or movement misalignment, guaranteeing the overall functional stability of the device during surgery and its reliability for clinical use.

[0022] In summary, this invention, through mechanical structural innovation and functional integration, significantly improves the protection of the patient's soft tissues while ensuring full exposure of the surgical field, and has good clinical application value. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 for Figure 1 Enlarged view of point A; Figure 3 This is a partial structural diagram of an embodiment of the present invention; Figure 4 for Figure 3 Enlarged view of point B; Figure 5 This is a partial cross-sectional structural diagram of an embodiment of the present invention; Figure 6 This is a partial side view cross-sectional structural schematic diagram of an embodiment of the present invention; Figure 7 for Figure 6 Enlarged view of point C; Figure 8 for Figure 7 Enlarged view of point D; Figure 9 This is a partial top-view cross-sectional structural diagram of an embodiment of the present invention; Figure 10 This is a schematic diagram illustrating the connection relationship between the reciprocating motion component, the dynamic pushing component, and the guiding component in an embodiment of the present invention. Figure 11 This is a top cross-sectional view of the connection relationship between the reciprocating motion component, the guide component, and the elastic positioning component in an embodiment of the present invention. Figure 12 This is a cross-sectional structural diagram illustrating the connection relationship between the elastic expansion component and the drainage and anti-sticking component in an embodiment of the present invention.

[0024] In the diagram: 1. Support frame; 2. Hydraulic expansion assembly; 21. Fixed seat; 22. Dual-axis hydraulic cylinder; 23. Expansion plate; 24. First limiting rod; 25. Second limiting rod; 26. Moving frame; 3. Elastic expansion assembly; 31. Fixed cylinder; 32. First spring; 33. Limiting block; 34. Moving plate; 35. First rotating column; 36. Expansion rod; 37. Conical outlet; 4. Reciprocating motion assembly; 41. Servo motor; 42. Threaded rod; 43. T-shaped threaded block; 44. Slide rod; 45. Slot; 5. Dynamic pushing assembly; 51. Pushing block; 52. Inclined surface; 6. Guide assembly; 61. Guide block 62. Horizontal groove; 63. Arc groove; 7. Elastic positioning component; 71. Sliding column; 72. Second spring; 73. Ball bearing; 8. U-shaped push rod; 9. Liquid extraction component; 91. Mounting bracket; 92. Liquid storage cylinder; 93. Cover; 94. First liquid outlet pipe; 95. Second liquid outlet pipe; 96. First one-way valve; 97. First connecting pipe; 98. Support plate; 99. Liquid extraction frame; 910. Push-pull rod; 911. Second rotating column; 912. Piston; 10. Drainage anti-sticking component; 101. Second connecting pipe; 102. Second one-way valve; 103. Hose; 104. L-shaped water outlet pipe; 105. L-shaped drain pipe. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] To address the technical challenge of using built-in hydraulic expanders during prolonged, concentrated pressure on soft tissue, which can easily lead to impaired local blood circulation and tissue ischemia and hypoxia, thus failing to meet the requirements of prolonged arthroscopic surgery, such as… Figures 1-7 and Figures 9-12 As shown, the following preferred technical solutions are provided: like Figure 1 and Figure 2As shown, an internal hydraulic dilator for arthroscopic surgery includes a support frame 1, which supports and fixes various components. A controller (not shown in the figure) is mounted on one side of the support frame 1. A hydraulic dilator assembly 2, which contains six elastic dilator components 3, is arranged in groups of three, with two groups of components facing each other. The hydraulic dilator assembly 2 can drive the two groups of components 3 to move away from each other, thereby achieving smooth dilation of the arthroscopic surgical wound and providing a stable operating space for the surgery. Figure 3 and Figure 4 As shown, the hydraulic expansion assembly 2 is equipped with two reciprocating motion components 4, such as... Figure 9 As shown, each of the two reciprocating motion components 4 is provided with a dynamic pushing component 5 on one side. The dynamic pushing component 5 is attached to the elastic expansion component 3. The reciprocating motion component 4 is used to drive the dynamic pushing component 5 to perform reciprocating linear motion. In conjunction with the two sets of dynamic pushing components 5, the three elastic expansion components 3 are disengaged and reset in sequence, so as to avoid tissue damage and poor blood circulation caused by long-term expansion.

[0027] In use, the hydraulic expansion component 2 is supported in a suitable position by the support frame 1, and several elastic expansion components 3 are placed in the middle of the patient's wound. At this time, the controller causes the hydraulic expansion component 2 to drive the two sets of elastic expansion components 3 to move away from each other until the wound is expanded to the appropriate position and then the expansion stops. During the expansion process, the elastic structure inside the elastic expansion component 3 can adapt to the hardness difference of different areas of tissue in the wound, so as to achieve uniform contact between each elastic expansion component 3 and the wound tissue, avoiding local stress concentration. Compared with the rigid connection expansion structure in the existing technology, which cannot adapt to the hardness difference of tissue and is prone to local pressure damage, this technology can effectively reduce tissue damage during the expansion process, while improving expansion stability and ensuring precise control of the surgical operation space.

[0028] During prolonged expansion, the controller causes the reciprocating motion component 4 to drive the dynamic pushing component 5 to reciprocate. During the reciprocating motion of the dynamic pushing component 5, the two sets of dynamic pushing components 5 each push the three elastic expansion components 3 on the same side in turn, causing the three elastic expansion components 3 to successively release their adhesion to the wound tissue. This achieves dynamic intermittent decompression of the wound tissue, restores local blood circulation, and avoids tissue ischemia, hypoxia, and damage caused by prolonged continuous expansion. Compared with the shortcomings of the continuous constant expansion commonly used in existing technologies, this method can effectively protect the blood supply of the wound tissue while maintaining the overall surgical expansion space, thereby improving surgical safety and clinical suitability.

[0029] like Figure 9 , Figure 10 and Figure 11As shown, guide components 6 are slidably disposed on one side of each of the two reciprocating motion components 4. Two elastic positioning components 7 are disposed within the guide components 6, and the elastic positioning components 7 are engaged with the reciprocating motion components 4. Figure 3 and Figure 4 As shown, the hydraulic expansion assembly 2 is equipped with a liquid extraction assembly 9, which is rotatably connected to the guide assembly 6. Figure 6 and Figure 7 As shown, each of the several elastic expansion components 3 is provided with a drainage and anti-adhesion component 10. The drainage and anti-adhesion component 10 is connected to the suction component 9. During the movement of the reciprocating motion component 4 and the dynamic pushing component 5 pushes the elastic expansion component 3, before the corresponding elastic expansion component 3 moves away from the wound, the guide component 6 pushes and pulls the suction component 9 to perform suction and drainage, so that the physiological saline in the suction component 9 seeps out to the contact surface between the elastic expansion component 3 and the wound tissue, avoiding adhesion between the elastic expansion component 3 and the tissue in the wound, and preventing secondary damage caused by pulling the tissue when detached.

[0030] When the reciprocating motion component 4 drives the dynamic pushing component 5 to reciprocate, it can simultaneously drive the guiding component 6 to move. Before the dynamic pushing component 5 pushes the elastic expansion component 3 to remove its adhesion to the wound tissue, the guiding structure in the guiding component 6 can limit the saline solution in the aspiration component 9 to be pushed out and then re-pulled in. The pushed-out saline solution can evenly wet the contact surface between the elastic expansion component 3 and the wound tissue through the drainage and anti-adhesion component 10, forming a liquid isolation layer to prevent the tissue from adhering to the elastic expansion component 3 that is about to be pushed. Compared with the existing technology that lacks an active anti-adhesion structure and the problem that the elastic expansion component 3 is prone to adhering to the tissue and causing secondary damage, this technology can effectively prevent the elastic expansion component 3 from pulling the wound tissue when it is detached, thereby improving the safety of the surgical operation and the tissue protection effect.

[0031] like Figures 2-7 As shown, the hydraulic expansion assembly 2 includes a fixed base 21 fixedly connected to one side of the support frame 1. A dual-axis hydraulic cylinder 22 is installed inside the fixed base 21. An expansion plate 23 is fixedly connected to each of the two output ends of the dual-axis hydraulic cylinder 22. A first limiting rod 24 is fixedly connected to the top of one side of the expansion plate 23, and two second limiting rods 25 are fixedly connected to the bottom of one side of the expansion plate 23. The first limiting rod 24 and the two second limiting rods 25 are slidably connected to the fixed base 21. A movable frame 26 is fixedly connected to one side of the two second limiting rods 25. The two movable frames 26 are slidably connected to the fixed base 21. Two sets of elastic expansion assemblies 3 are respectively set on the two movable frames 26. The dual-axis hydraulic cylinder 22 can drive the two output ends to extend and retract synchronously and with the same force, causing the two expansion plates 23 to move away from or closer to each other, thereby driving the two sets of elastic expansion assemblies 3 to achieve stable expansion and contraction of the wound, ensuring uniform expansion force and controllable stroke.

[0032] like Figure 3 , Figures 5-7 , Figure 9 and Figure 12 As shown, the elastic expansion assembly 3 includes a fixed cylinder 31 fixedly connected to one side of the movable frame 26. A first spring 32 is fixedly connected inside the fixed cylinder 31, and a limiting block 33 is fixedly connected to the other end of the first spring 32. The limiting block 33 is slidably connected to the fixed cylinder 31. A movable plate 34 is slidably connected inside the fixed cylinder 31. The limiting block 33 is fixedly connected to the movable plate 34. A first rotating column 35 is rotatably connected to one end of the movable plate 34. The elastic force of the first spring 32 is adapted to the resistance range of the arthroscopic surgical wound tissue. The force is gentle and has sufficient support. During expansion, the displacement can be adaptively adjusted according to the tissue hardness, so that the first rotating column 35 is always within the pushing range of the dynamic pushing assembly 5, while providing a margin for pushing, ensuring the dynamic pushing assembly... Component 5 can stably push the elastic expansion component 3 to achieve detachment and repositioning, and the other end of the moving plate 34 is fixedly connected to the expansion rod 36. The expansion end of the expansion rod 36 is provided with an arc-shaped section, which can conform to the curved contour of the arthroscopic surgical wound, increase the contact area with the wound tissue to disperse the expansion pressure, and reduce tissue damage during the expansion process. Several conical liquid outlets 37 are evenly opened on one side of the expansion rod 36, which can evenly and accurately deliver the physiological saline delivered by the drainage and anti-adhesion component 10 to the contact surface between the expansion rod 36 and the wound tissue, while ensuring comprehensive infiltration, further enhancing the anti-adhesion effect, preventing the expansion rod 36 from pulling the wound tissue when detaching, and reducing the risk of secondary damage. The elastic structure inside the above-mentioned elastic expansion component 3 is a first spring 32.

[0033] like Figure 6 , Figure 9 and Figure 11 As shown, the reciprocating motion assembly 4 includes a servo motor 41 installed on one side of the moving frame 26. A threaded rod 42 is fixedly connected to the output end of the servo motor 41. The threaded rod 42 is rotatably connected to the moving frame 26. A T-shaped threaded block 43 is threadedly connected to the outer wall of the threaded rod 42. A slide rod 44 is fixedly connected inside the moving frame 26. The T-shaped threaded block 43 is slidably connected to the slide rod 44. Four slots 45 are opened on the inner wall of the T-shaped threaded block 43. At the same time, every two slots 45 are set as a group, and the two groups of slots 45 are arranged opposite to each other.

[0034] like Figure 10 As shown, the dynamic pushing component 5 includes a pushing block 51 fixedly connected to the top of one side of the T-shaped threaded block 43. Two inclined surfaces 52 are arranged opposite each other on one side of the pushing block 51. By setting the two inclined surfaces 52, when the T-shaped threaded block 43 drives the pushing block 51 to reciprocate, it can smoothly abut and push the first rotating column 35 of the elastic expansion component 3, so as to realize the sequential disengagement and reset of the three elastic expansion components 3, avoid the situation of jamming and pulling tissue during pushing and resetting, and ensure the smoothness of dynamic decompression.

[0035] In use, the support frame 1 supports the fixed base 21 in a suitable position, and several expansion rods 36 are placed in the middle of the patient's wound. At this time, the controller causes the two output ends of the dual-axis hydraulic cylinder 22 to drive the two expansion plates 23 and the two moving frames 26 away from each other, so that the two moving frames 26 slide at the bottom of the fixed base 21. When the two moving frames 26 move, they simultaneously drive the two sets of expansion rods 36 away from each other until the wound is expanded to a suitable position and then the expansion stops. During the expansion process, the first spring 32 can adapt to the hardness difference of different areas of tissue in the wound, so that each expansion rod 36 fits evenly with the wound tissue and avoids local stress concentration. Compared with the rigid connection expansion structure in the prior art, which cannot adapt to the hardness difference of tissue and is prone to local pressure damage, this can effectively reduce tissue damage during the expansion process, improve expansion stability, and ensure precise control of the surgical operation space.

[0036] During prolonged expansion, the controller drives the servo motor 41 to rotate the threaded rod 42, which is connected to the threaded rod 42 via a T-shaped threaded block 43. This causes the T-shaped threaded block 43 to reciprocate, which in turn drives the push block 51 to reciprocate. During the reciprocating motion of the push block 51, the two inclined surfaces 52 of the push block 51 sequentially push the three first rotating columns 35 from both sides. The first rotating columns 35 push the moving plate 34 and the limiting block 33, causing the moving plate 34 and the limiting block 33 to slide within the fixed cylinder 31. The moving plate 34 then drives the expansion rod 36 to move, causing the three expansion rods 36 to sequentially and individually release their contact with the wound tissue. This achieves dynamic intermittent decompression of the wound tissue, restores local blood circulation, and avoids tissue ischemia, hypoxia, and damage caused by prolonged continuous expansion. Compared to the shortcomings of continuous constant expansion commonly used in existing technologies, this method can effectively protect the blood supply of the wound tissue while maintaining the overall surgical expansion space, thus improving surgical safety and clinical suitability.

[0037] Meanwhile, the controller can adaptively set the reciprocating speed of the two servo motors 41 to adapt to the clinical needs of different surgical sites, tissue states and surgical durations, and adjust the intermittent decompression frequency of the expansion rod 36. Under the premise of ensuring the restoration of tissue blood supply, it does not interfere with the normal surgical operation rhythm, thereby improving the adaptability and flexibility of the entire device.

[0038] To address the technical problem of tissue adhesion and secondary damage that can easily occur during the process of sequentially removing individual tissue from the wound, such as... Figure 3 , Figure 4 and Figures 6-12 As shown, the following preferred technical solutions are provided: like Figure 10 and Figure 11As shown, the guide assembly 6 includes a guide block 61 that is slidably connected to the bottom of one side of the T-shaped threaded block 43. Two horizontal grooves 62 are opened opposite each other on the top of the guide block 61. An arc groove 63 is opened on the top of the guide block 61. The two horizontal grooves 62 are respectively connected to the two sides of the arc groove 63. The guide structure in the guide assembly 6 is the arc groove 63.

[0039] like Figure 11 As shown, the elastic positioning component 7 includes a sliding post 71 slidably connected within the guide block 61. A second spring 72 is fixedly connected to one side of the sliding post 71, and the other end of the second spring 72 is fixedly connected to the inner wall of the guide block 61. A ball bearing 73 is slidably connected to one end of the sliding post 71, and the ball bearing 73 engages with the slot 45. The ball bearing 73 ensures smooth engagement and disengagement between the elastic positioning component 7 and the slot 45, reducing sliding friction and ensuring that the guide component 6 moves synchronously and smoothly with the reciprocating motion component 4. It also provides precise positioning, preventing the guide component 6 from shifting. The outer edge of the slot 45 is arc-shaped to prevent jamming. To prevent jamming and sticking, the second spring 72 reduces wear on the ball bearing 73 and the groove 45, ensures the flexible extension and retraction of the elastic positioning component 7, and ensures smooth operation of all components. At the same time, the elastic force of the second spring 72 is adapted to the force range required by the push-pull liquid extraction component 9. The force is moderate and stable, and it can always apply a stable pushing force to the sliding column 71 during the push-pull liquid extraction component 9 process, which passes through the limit in the guide component 6. This firmly holds the ball bearing 73 against the groove 45, preventing the ball bearing 73 from dislodging from the groove 45 and causing the guide component 6 to deviate. This ensures that the liquid extraction and discharge action of the liquid extraction component 9 is accurate and controllable, and ensures smooth operation of all components.

[0040] like Figure 9 As shown, a U-shaped push rod 8 is fixedly connected inside the movable frame 26. When one side of the guide block 61 moves to fit with the U-shaped push rod 8, the reciprocating motion component 4 moves continuously, causing the sliding column 71 to overcome the resistance of the second spring 72, causing the ball 73 to cancel its engagement with the slot 45. The U-shaped push rod 8 pushes the guide block 61 to slide in the T-shaped threaded block 43, causing the two balls 73 to engage with another set of slots 45, thereby realizing the position switching of the guide component 6. This ensures that the aspiration component 9 continuously and stably completes the cycle of pushing out and drawing in saline solution, adapting to the reciprocating motion component 4, the dynamic pushing component 5, and the guide component 6. At the same time, the positions of the pushing block 51 and the guide block 61 are always staggered, so that the liquid discharge action of the aspiration component 9 always completes before the action of the dynamic pushing component 5 pushing the elastic expansion component 3 to detach from the tissue. This ensures that the saline solution wets the contact surface between the expansion rod 36 and the tissue in advance and forms an anti-adhesion isolation layer, achieving the time-sequential coordination of anti-adhesion and intermittent decompression.

[0041] like Figure 4 , Figure 6 , Figure 8 and Figure 9As shown, the fluid extraction assembly 9 includes two mounting brackets 91 fixedly connected to one side of the movable frame 26. A fluid reservoir 92 is fixedly connected within each mounting bracket 91. A cap 93 is threaded onto the top of the fluid reservoir 92. The cap 93 has a vent hole to prevent negative pressure from being generated inside the fluid reservoir 92 due to continuous extraction of saline solution, which could lead to poor fluid flow and unstable fluid supply. It also prevents external dust and contaminants from entering the fluid reservoir 92, ensuring the sterility of the saline solution and meeting the medical sterility requirements of arthroscopic surgery. A first outlet pipe 94 is connected to the bottom of the cap 93, and a second outlet pipe 95 is connected to the other end of the first outlet pipe 94. The second outlet pipe 95 is connected to the movable frame 26. The movable frame 26 is fixedly connected, and several first one-way valves 96 are connected to the second liquid outlet pipe 95. The other end of each of the first one-way valves 96 is connected to a first connecting pipe 97. Support plates 98 are fixedly connected inside both movable frames 26. Several liquid extraction frames 99 are fixedly connected to the top of the support plates 98. The first connecting pipe 97 is connected to the liquid extraction frame 99. A push-pull rod 910 is slidably connected to one side of the liquid extraction frame 99. A second rotating column 911 is rotatably connected to one end of the push-pull rod 910. The three second rotating columns 911 are evenly spaced and can be pushed sequentially. A piston 912 is fixedly connected to the other end of the push-pull rod 910. The piston 912 is slidably connected to the liquid extraction frame 99. Before surgery, the T-shaped threaded block 43 drives the guide block 61 to reciprocate, so that the entire liquid delivery passage of the aspiration component 9 and the drainage anti-adhesion component 10 is filled with saline. This can remove air from the passage in advance, ensuring that the saline is continuously, evenly and stably discharged during the operation, avoiding interruption of the discharge or air bubbles affecting the anti-adhesion effect, and ensuring that the anti-adhesion function operates reliably during the operation.

[0042] like Figure 7 , Figure 8 and Figure 12 As shown, the drainage and anti-sticking component 10 includes a second connecting pipe 101 connected to one side of the liquid extraction frame 99, and a second one-way valve 102 connected to the other end of the second connecting pipe 101. A hose 103 is connected to one end of the second one-way valve 102. An L-shaped water outlet pipe 104 is fixedly connected inside the moving plate 34 and the expansion rod 36. The L-shaped water outlet pipe 104 is connected to the hose 103. Several L-shaped drain pipes 105 are evenly connected to both sides of the L-shaped water outlet pipe 104. The L-shaped drain pipes 105 are connected to the conical liquid outlet 37.

[0043] When the push block 51 reciprocates via the T-shaped threaded block 43, it synchronously drives the guide block 61 to move. Before the push block 51 pushes the expansion rod 36 to release its contact with the wound tissue, the second rotating column 911 enters the arc-shaped groove 63 through one of the transverse grooves 62. During the continuous movement of the guide block 61, the arc-shaped groove 63 limits the movement of the second rotating column 911, allowing it to push the push-pull rod 910 and the piston 912 to slide within the suction frame 99. This allows the saline solution within the suction frame 99 to pass through the second connecting pipe 101 and the second one-way valve. 102, 103, and 104 are connected to the L-shaped drain pipe 105 and discharged through the conical outlet 37. This allows for uniform wetting of the contact surface between the elastic expansion component 3 and the wound tissue, forming a liquid isolation layer to prevent the tissue from adhering to the elastic expansion component 3 that is about to be pushed. Compared with existing technologies that lack an active anti-adhesion structure and where the elastic expansion component 3 is prone to adhering to the tissue and causing secondary damage, this technology can effectively prevent the elastic expansion component 3 from pulling on the wound tissue when it is detached, thereby improving the safety of the surgical procedure and the tissue protection effect.

[0044] Then, through the continuous movement of the guide block 61 and the limiting of the arc groove 63, the second rotating column 911 pulls the push-pull rod 910 and the piston 912 to slide in the suction frame 99, and draws the physiological saline in the storage cylinder 92 into the suction frame 99 through the first outlet pipe 94, the second outlet pipe 95, the first one-way valve 96 and the first connecting pipe 97, in preparation for the next discharge.

[0045] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0046] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An internal hydraulic dilator for arthroscopic surgery, characterized in that, include Support frame (1); A hydraulic expansion assembly (2) is mounted on the support frame (1); A plurality of elastic expansion components (3) are divided into at least two groups, and each group includes at least one elastic expansion component (3). The two groups of elastic expansion components (3) are disposed opposite to each other on the hydraulic expansion component (2). The hydraulic expansion component (2) can drive the two groups of elastic expansion components (3) to move closer or further apart relative to each other to expand or contract the wound. A reciprocating motion component (4) is disposed on the hydraulic expansion component (2); The dynamic pushing component (5) is connected to the reciprocating motion component (4) and is attached to the elastic expansion component (3); The reciprocating motion component (4) is used to drive the dynamic pushing component (5) to perform reciprocating linear motion, so that the dynamic pushing component (5) pushes the elastic expansion component (3) on the same side in sequence, so that each elastic expansion component (3) disengages from the wound tissue in sequence.

2. The built-in hydraulic dilator for arthroscopic surgery according to claim 1, characterized in that, The hydraulic expansion assembly (2) includes: The fixed base (21) is fixedly connected to the support frame (1); A dual-axis hydraulic cylinder (22) is installed in the fixed base (21); Two expansion plates (23) are fixedly connected to the two output ends of the dual-axis hydraulic cylinder (22); Two movable frames (26) are fixedly connected to two expansion plates (23) respectively, and slidably connected to the fixed base (21); Two sets of elastic expansion components (3) are respectively set on two movable frames (26).

3. The built-in hydraulic dilator for arthroscopic surgery according to claim 1, characterized in that, The elastic expansion component (3) includes: A fixed cylinder (31) is fixedly connected to the movable frame (26); The first spring (32) is disposed inside the fixed cylinder (31); The limiting block (33) is fixedly connected to one end of the first spring (32), and the limiting block (33) is slidably connected to the fixed cylinder (31); The movable plate (34) is slidably disposed inside the fixed cylinder (31) and connected to the first spring (32); The first rotating column (35) is rotatably connected to one end of the movable plate (34); An expansion rod (36) is fixedly connected to one end of the movable plate (34) for contacting wound tissue.

4. The built-in hydraulic dilator for arthroscopic surgery according to claim 2, characterized in that, The reciprocating motion component (4) includes: A servo motor (41) is mounted on the moving frame (26); The threaded rod (42) is fixedly connected to the output end of the servo motor (41); The T-shaped threaded block (43) is threadedly connected to the threaded rod (42) and slidably connected to the movable frame (26); The slide bar (44) is fixedly connected inside the movable frame (26) and slidably connected to the T-shaped threaded block (43).

5. The built-in hydraulic dilator for arthroscopic surgery according to claim 4, characterized in that, The dynamic propulsion component (5) includes: The push block (51) is fixedly connected to the T-shaped threaded block (43); An inclined surface (52) is provided on the push block (51) for contacting and pushing the elastic expansion component (3).

6. The built-in hydraulic dilator for arthroscopic surgery according to claim 1, characterized in that, Also includes: The guide component (6) is slidably disposed on the reciprocating motion component (4); The liquid extraction assembly (9) is disposed on the hydraulic expansion assembly (2) and is rotatably connected to the guide assembly (6); The draining anti-sticking component (10) is disposed inside the elastic expansion component (3) and is connected to the liquid extraction component (9); During the movement of the reciprocating motion component (4), before the dynamic pushing component (5) pushes the corresponding elastic expansion component (3) away from the wound, the guide component (6) pushes and pulls the liquid aspiration component (9), so that the liquid in the liquid aspiration component (9) seeps out through the drainage and anti-adhesion component (10) to the contact surface between the elastic expansion component (3) and the wound tissue.

7. The built-in hydraulic dilator for arthroscopic surgery according to claim 6, characterized in that, The guiding component (6) includes: The guide block (61) is slidably connected to the reciprocating motion assembly (4); Two transverse grooves (62) are formed opposite to each other on the guide block (61); An arc-shaped groove (63) is formed on the guide block (61), and the two sides of the arc-shaped groove (63) are respectively connected to the two transverse grooves (62).

8. The built-in hydraulic dilator for arthroscopic surgery according to claim 7, characterized in that, The liquid extraction assembly (9) includes: The liquid storage cylinder (92) is fixedly mounted on the hydraulic expansion assembly (2); The first liquid outlet pipe (94) is connected to the end of the liquid storage cylinder (92); The second outlet pipe (95) is connected to the first outlet pipe (94) and is fixedly connected to the hydraulic expansion assembly (2); The liquid extraction frame (99) is fixedly installed inside the hydraulic expansion assembly (2); The push-pull rod (910) is slidably disposed on the liquid extraction frame (99). One end of the rod is provided with a second rotating column (911) that cooperates with the arc groove (63), and the other end is provided with a piston (912). The piston (912) is slidably disposed in the liquid extraction frame (99).

9. The built-in hydraulic dilator for arthroscopic surgery according to claim 8, characterized in that, The drainage and anti-sticking component (10) includes a liquid passage connecting the contact surface of the suction frame (99) and the expansion rod (36).

10. The built-in hydraulic dilator for arthroscopic surgery according to claim 6, characterized in that, It also includes an elastic positioning component (7), which is disposed within the guide component (6) and is used to engage with the reciprocating motion component (4); The elastic positioning component (7) includes: The sliding column (71) is slidably connected within the guide assembly (6); The second spring (72) is disposed between the sliding post (71) and the guide assembly (6); The ball bearing (73) is tumblingly connected to one end of the sliding column (71) and is used to engage with the reciprocating motion assembly (4).

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