Perfusate automatic pressure regulating equipment for shoulder arthroscopy surgery

Abstract

The invention discloses an automatic perfusate pressure regulating device for shoulder arthroscopy surgery, relates to the technical field of perfusate pressure regulation, and aims to solve the technical problem that the pressure accuracy is difficult to control in real time in the traditional mode of manually regulating the height of a perfusate bag to control the perfusate pressure, the automatic perfusate pressure regulating device comprises a base, and an infusion support and a pressure regulating assembly are arranged at the top of the base; the pressure adjusting assembly comprises a liquid storage barrel, a liquid pushing barrel and a liquid outlet barrel are movably arranged in an inner cavity of the liquid storage barrel, the liquid pushing barrel is arranged below the liquid outlet barrel, a liquid storage cavity is formed between the liquid pushing barrel and the liquid outlet barrel and used for storing perfusate to be output, the liquid pushing barrel is in sliding sealing fit with the inner wall of the liquid storage barrel, and a needle syringe type volume variable structure is formed. A driving assembly is arranged on the side wall of the infusion support. The device has the advantage that the perfusate pressure can be automatically and stably adjusted in real time.

Description

Technical Field

[0001] This invention relates to the field of perfusion fluid pressure regulation technology, and more specifically, to an automatic perfusion fluid pressure regulation device for shoulder arthroscopic surgery. Background Technology

[0002] Rotator cuff tears are a common musculoskeletal injury, with an incidence rate increasing with age. Approximately 50% of patients over 60 years of age have rotator cuff tears, making it a leading cause of shoulder pain and dysfunction, severely impacting patients' quality of life. Currently, rotator cuff repair surgery mainly includes open surgery, arthroscopic combined with small incision minimally invasive repair, and arthroscopic rotator cuff repair. With the development of arthroscopic techniques and instruments, arthroscopic rotator cuff repair has become the mainstream clinical procedure. Arthroscopic rotator cuff repair requires a large amount of irrigation fluid to maintain unobstructed flow and ensure sufficient expansion of the joint capsule. Strict control of the irrigation pressure is essential for successful surgery. Studies have shown that the difference between the subacromial irrigation pressure and systolic blood pressure needs to be controlled at 50 mmHg to effectively reduce capillary bleeding, providing the surgeon with a clear surgical field for precise operation. Therefore, the irrigation fluid should be injected at a height of 1 meter above the heart level, maintaining a pressure of 60 mmHg to minimize capillary bleeding.

[0003] Traditional shoulder arthroscopy relies on manual adjustment of the infusion bag height to control infusion pressure. This typically involves suspending the bag on an IV stand and using a lift to adjust its height, maintaining a constant pressure through hydrostatic pressure. However, during surgery, factors such as instrument insertion / removal, patient positioning changes, and fluid level drops can cause pressure fluctuations. Excessive pressure can lead to increased bleeding and blurred vision, while excessive pressure may compress blood vessels, cause postoperative swelling, or even nerve damage. Under these conditions, the surgeon faces significantly increased difficulty and risk, potentially missing critical lesions and affecting surgical outcomes. Furthermore, relying on manual adjustment of the infusion bag height not only compromises accuracy but also requires medical staff to observe changes in the surgical field before manually adjusting the IV stand, introducing a significant time lag that cannot promptly mitigate the impact of abnormal pressure on the surgery. Therefore, we propose an automatic infusion pressure regulating device for shoulder arthroscopy. Summary of the Invention

[0004] The purpose of this invention is to provide an automatic pressure regulating device for infusion fluid in shoulder arthroscopy, so as to solve the technical problem that the traditional method of controlling the infusion pressure by manually adjusting the height of the infusion fluid bag is difficult to control the pressure accuracy in real time.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an automatic pressure regulating device for perfusion fluid in shoulder arthroscopy, comprising a base, an infusion stand and a pressure regulating component arranged on the top of the base; the pressure regulating component includes a reservoir, a pusher and an outlet are movably arranged inside the reservoir, the pusher being positioned below the outlet; a reservoir chamber is formed between the pusher and the outlet; the pusher and the inner wall of the reservoir form a sliding seal fit, forming a syringe-like variable volume structure; a drive component is arranged on the side wall of the infusion stand; the drive component is used to drive the pusher to slide at a uniform speed, decelerate, or accelerate within the reservoir; the outlet includes an outlet channel, which, when the pusher slides upward within the reservoir, compresses the reservoir chamber, allowing the perfusion fluid to be output through the outlet channel.

[0006] Preferably, the drive assembly includes a motor and a controller arranged on the side wall of the infusion stand, the controller being electrically connected to the motor; the drive assembly also includes a monitoring frame arranged on the other side wall of the infusion stand, an upper sensor being installed on the top of the monitoring frame and a lower sensor being installed on the bottom of the monitoring frame, a monitoring area being formed between the upper sensor and the lower sensor, and both the upper sensor and the lower sensor being electrically connected to the controller.

[0007] Preferably, the drive assembly further includes a wheel frame arranged on the other side wall of the infusion stand, on which a large gear and a transmission gear are rotatably arranged, and the large gear and the transmission gear are coaxially connected; the output end of the motor is connected to a small gear, and the small gear meshes with the large gear.

[0008] Preferably, the pressure regulating assembly further includes a support column arranged on the top of the base, the liquid storage cylinder is arranged on the top of the support column and installed on the side wall of the infusion stand by multiple fixing brackets; the inner cavity side wall of the support column is provided with a slide rail, and the outer circumference of the support column is provided with an elongated groove communicating with its inner cavity; the liquid pushing cylinder is composed of a piston head and a push-pull rod, the piston head is connected to the top of the push-pull rod, the piston head is slidably and sealed in the inner cavity of the liquid storage cylinder, one side wall of the push-pull rod is provided with a slide groove, and the other side wall is provided with a toothed opening, the push-pull rod is slidably arranged on the slide rail on the inner cavity side wall of the support column through the slide groove, and the transmission gear is movably arranged in the elongated groove and meshes with the toothed opening.

[0009] Preferably, the discharge cylinder includes a piston head two that is slidably and sealed within the inner cavity of the storage cylinder. A straight output pipe is connected to the top of the piston head two. The inner cavity of the piston head two is in communication with the inner cavity of the straight output pipe, forming the discharge channel. A fixing block and a piston block are integrally formed on the outer circumference of the straight output pipe, with the piston block positioned above the fixing block. A limiting ring plate is arranged on the inner circumference of the storage cylinder, and the piston head two is positioned below the limiting ring plate. A movable chamber is formed above the limiting ring plate, and both the fixing block and the piston block are arranged within the movable chamber. The fixing block is clearance-fitted with the inner sidewall of the movable chamber, and the piston block is slidably and sealed with the inner sidewall of the movable chamber. The top of the piston block is connected to the top of the movable chamber via a spring. The top of the straight output pipe extends above the storage cylinder and is clearance-fitted with the inner sidewall of the storage cylinder. An infusion hose is connected to the top of the straight output pipe, and the infusion hose is used to deliver the infusion fluid to the shoulder joint cavity through an external dedicated infusion catheter.

[0010] Preferably, the side wall of the liquid storage cylinder has a slot communicating with its inner cavity, and a monitoring element connected to the side wall of the fixed block is movably arranged in the slot. The other end of the monitoring element is arranged in the monitoring area between the upper sensor and the lower sensor. The outer circumference of the liquid storage cylinder is provided with an upper monitoring line, a standard line and a lower monitoring line.

[0011] Preferably, the monitoring component includes a fixing plate connected to the side wall of the fixing block, the side wall of the fixing plate having a rotating groove, the inner cavity of the fixing block being a spherical chamber, the rotating groove communicating with the spherical chamber, the inner side wall of the rotating groove having a limiting arc groove with a semi-circular cross-section; a rotating tube is rotatably sealed within the rotating groove, the end of the rotating tube being connected to a spherical tube, the spherical tube being movably arranged within the spherical chamber of the fixing block, the spherical tube including a drain channel and an inlet channel, the drain channel having the same diameter as the inner cavity of the straight output tube, the inlet channel communicating with the inner cavity of the rotating tube; the drain channel and the inlet channel being arranged at right angles in the same plane.

[0012] Preferably, the outer circumferential wall of the rotating tube is connected to a locking block, which is movably arranged within the limiting arc groove, and the rotational stroke of the locking block within the limiting arc groove is limited to ninety degrees; the inner cavity of the fixed plate is provided with multiple sliding holes and multiple movable holes, and the sliding holes and the movable holes are in a communicating state; a receiving plate is arranged on the side of the fixed plate, and an insertion tube is connected to the side wall of the receiving plate, and the insertion tube is inserted into the inner cavity of the rotating tube; the receiving plate and the inner cavity of the insertion tube are in a communicating state and form an insertion channel, which is used for the insertion connection of the output tube head of the filling bag; multiple guide rods are also connected to the side wall of the receiving plate, and the ends of the guide rods are connected to sliding columns, the guide rods are movably arranged within the movable holes, and the sliding columns are slidably arranged within the sliding holes; wherein, the inner circumferential wall of the rotating tube is connected to a guide head, and the outer circumferential wall of the insertion tube is provided with a guide groove, and the guide head can slide into the guide groove.

[0013] Preferably, a stop bar is slidably arranged on the side wall of the fixed plate, the stop bar being positioned below the locking block to limit the rotation of the locking block; a second tooth is arranged on the top of the stop bar, the second tooth being meshed with a control gear, the control gear being rotatably arranged on the side wall of the fixed plate and coaxially connected to a bevel gear, the bevel gear being meshed with a bevel gear, the bevel gear being rotatably arranged on the other side wall of the fixed plate, and the bevel gear being coaxially connected to an adjusting gear; a third tooth is arranged on the side wall of one of the guide rods, when the insertion tube and the inner cavity of the rotating tube form an insertion contact, the third tooth is separated from the adjusting gear; when the insertion tube and the inner cavity of the rotating tube are separated, the third tooth is meshed with the adjusting gear.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. This invention designs a pressure regulating component that utilizes the push cylinder and storage cylinder of the pressure regulating component to form a syringe-like variable volume structure. Combined with the outlet cylinder, it constructs a dynamically adjustable storage chamber, achieving basic controllability of the infusion fluid output pressure. The piston head of the outlet cylinder slides and seals against the inner wall of the storage cylinder. Combined with the synergistic effect of the straight output pipe, fixed block, and piston block, it can stably deliver the infusion fluid through the outlet channel. Furthermore, the sliding seal between the piston block and the movable chamber, along with the elastic reset function of the spring, converts the hydraulic changes in the storage chamber into the lifting and lowering motion of the outlet cylinder. Furthermore, the monitoring element within the groove on the side wall of the storage cylinder converts hydraulic changes into changes in the height of the monitoring element. This allows for direct visual observation and synchronous transmission to the monitoring area of ​​the drive component, providing accurate monitoring signals to the upper and lower sensors. Ultimately, this achieves linkage between the pressure regulating component and the drive component, enabling automatic, real-time, and stable adjustment of the infusion hydraulic pressure. This effectively solves the problem of difficulty in real-time pressure accuracy caused by traditional methods that rely on manual adjustment of the infusion bag height to control the infusion pressure.

[0016] 2. The present invention also arranges the liquid pusher below the liquid outlet, and arranges the liquid storage chamber for storing the infusion fluid to be output between the liquid pusher and the liquid outlet. When it is necessary to output the infusion fluid, the liquid pusher can be driven by the drive component to slide from bottom to top in the inner cavity of the liquid storage cylinder, thereby compressing the volume of the liquid storage chamber, so that the infusion fluid in the chamber has output power, and is stably delivered to the shoulder joint cavity through the liquid outlet channel of the liquid outlet. This structural design eliminates the reliance on hydrostatic pressure principles in traditional equipment. Traditional equipment relies on suspending an infusion bag and utilizing the gravitational potential energy created by the bag's height and the liquid level to maintain pressure. However, a drop in the liquid level directly reduces this gravitational potential energy, leading to hydraulic fluctuations. In contrast, the hydraulic pressure in the reservoir chamber is independent of the infusion fluid level. It can be precisely controlled simply by adjusting the upward movement speed of the pusher: when the pusher accelerates upward, the compression rate of the reservoir chamber increases, and the hydraulic pressure rises accordingly; when the pusher decelerates upward, the compression rate decreases, and the hydraulic pressure decreases accordingly; when the pusher moves at a constant speed, the compression rate remains stable, and the hydraulic pressure remains constant. Even if the infusion fluid volume in the reservoir chamber gradually decreases with output, maintaining the set upward movement speed of the pusher ensures that the hydraulic pressure remains within the target range. This avoids interference from changes in the infusion fluid level, achieving independent and stable hydraulic control and solving the problems of pressure fluctuations caused by a drop in liquid level, which affect the surgical field of vision and operational safety in traditional equipment.

[0017] 3. This invention utilizes a rotating, sealed rotating tube within the monitoring device, with a spherical tube connected to its end. When additional infusion fluid is needed, rotating the rotating tube causes the spherical tube to rotate within the spherical cavity, verticalizing the inlet channel and horizontalizing the outlet channel. This switches the inlet channel to connect with the inner cavity of the straight outlet tube for replenishment, while simultaneously sealing the outlet channel. During this process, the outlet end of the outlet channel formed within the straight outlet tube also closes, completely blocking the path of air into the infusion tubing and external dedicated infusion catheter, thus preventing air from entering the shoulder joint cavity and causing safety hazards such as air embolism. Any small amount of air that may enter during infusion fluid replenishment is limited to this purpose. The fluid enters the reservoir chamber below the straight output tube through the inlet channel. Subsequently, by controlling the pusher to slide downwards within the reservoir chamber, the negative pressure generated by the increased chamber volume allows external perfusion fluid to be stably drawn into the reservoir chamber through the inlet channel, completing the perfusion fluid replenishment. After replenishment, the pusher is pushed upwards, compressing the reservoir chamber volume. Internal air is preferentially expelled through the inlet channel until perfusion fluid seeps out, indicating that the air in the reservoir chamber has been completely removed, effectively preventing residual air bubbles from affecting the stability of the perfusion pressure. Finally, rotating the rotating tube again causes the spherical tube to rotate, closing the inlet channel and reconnecting the outlet channel to the inner cavity of the straight output tube, thus resuming the perfusion fluid injection operation. The entire process requires no disassembly of the tubing, achieving integrated operation of replenishing perfusion fluid, removing air, and restoring perfusion. This ensures the sealing and safety of the perfusion fluid delivery, simplifies the perfusion fluid replenishment procedure during surgery, and reduces interference with the surgical process.

[0018] 4. When the present invention requires connecting the filling fluid bag to replenish the liquid, insert the output tube of the filling fluid bag into the insertion channel of the receiving plate, and then push the receiving plate to drive the insertion tube into the inner cavity of the rotating tube. During this process, the guide head on the inner circumference of the rotating tube gradually contacts and forms a sliding fit with the guide groove on the outer circumference of the insertion tube. The guide groove drives the guide head to move through the groove path, thereby driving the rotating tube to rotate. Due to the 90-degree stroke limitation of the locking block in the limiting arc groove, the rotating tube rotates exactly 90 degrees, realizing the precise docking of the liquid inlet channel of the spherical tube with the inner cavity of the straight output tube, and the simultaneous closure of the liquid outlet channel. This ensures that the liquid from the filling fluid bag can be stably injected into the storage chamber through the insertion tube, the rotating tube, and the liquid inlet channel. The channel switching can be completed without manually adjusting the angle of the rotating tube, improving the convenience of operation and the accuracy of switching. When the filling fluid replenishment is completed, pull the receiving plate in the opposite direction. The receiving plate pulls the insertion tube out of the inner cavity of the rotating tube. The guide groove on the outer wall of the insertion tube moves with the insertion tube, driving the guide head on the inner wall of the rotating tube to slide in the opposite direction, causing the rotating tube to rotate in the opposite direction. The 90-degree travel limit of the locking block in the limiting arc groove ensures that the rotating tube rotates exactly 90 degrees in the opposite direction, thereby driving the ball tube to reset. The liquid inlet channel rotates synchronously to a horizontal closed state, offset from the inner cavity of the straight output tube. The liquid outlet channel rotates back to a vertical state, reconnecting precisely with the inner cavity of the straight output tube, restoring the function of the liquid outlet channel for outputting the filling liquid. Then the output tube head of the filling liquid bag can be pulled out, and the equipment can enter the normal filling state again. The entire replenishment and reset process does not require additional manual adjustment of the channel state, which not only ensures the accuracy of channel switching, but also further simplifies the operation process and avoids the risk of filling interruption or air entering the pipeline due to manual adjustment errors.

[0019] 5. This invention, through the design of a stop bar, allows the guide rod to engage the gear three with the adjusting gear before the insertion tube is inserted into the rotating tube. The gear transmission drives the stop bar to automatically slide and unlock, without obstructing the 90-degree rotation of the rotating tube caused by the guide groove of the insertion tube. After the injection fluid is replenished, when the insertion tube is withdrawn, the gear three engages with the adjusting gear again, driving the stop bar back to the position below the locking block, thus locking the rotation of the rotating tube. Simultaneously, a limiting arc groove provides bidirectional limiting, ensuring that the unlocking and locking actions of the stop bar are automatically triggered with the insertion or withdrawal of the insertion tube, eliminating the need for manual adjustment of the stop bar position. This solves the problem of unexpected rotation of the rotating tube during equipment vibration, hydraulic fluctuations, or injection operations, preventing misalignment of the drain channel and straight output pipe, and sealing failure of the inlet channel due to accidental rotation of the rotating tube, which could lead to injection fluid leakage, pressure fluctuations, or air entering the pipeline. This further ensures the reliability and safety of the injection fluid delivery. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the overall structure of the present invention from another perspective;

[0022] Figure 3 This is a schematic diagram of the output tube head structure of the infusion bag of the present invention;

[0023] Figure 4 This is a schematic diagram of the voltage regulating component structure of the present invention;

[0024] Figure 5 This is a schematic diagram of the drive component structure of the present invention;

[0025] Figure 6 for Figure 5 Enlarged schematic diagram of the structure at point A in the middle;

[0026] Figure 7 This is a schematic diagram of the cross-sectional structure of the support column of the present invention;

[0027] Figure 8 This is a schematic diagram of the cross-sectional structure of the liquid storage cylinder of the present invention;

[0028] Figure 9 This is a schematic diagram of the cross-sectional structure of the liquid outlet cylinder of the present invention;

[0029] Figure 10 This is a schematic diagram of the cross-sectional structure of the fixing block of the present invention;

[0030] Figure 11 for Figure 10 Enlarged schematic diagram of the structure at point B;

[0031] Figure 12 This is a schematic diagram of the disassembled structure of the fixing plate of the present invention;

[0032] Figure 13 This is a schematic diagram of the cannulation and tube transfer structure of the present invention;

[0033] Figure 14 This is a schematic diagram of the cross-sectional structure of the rotating tube and the spherical tube of the present invention;

[0034] Figure 15 This is a schematic diagram of the guide groove structure for the insertion cannula of the present invention.

[0035] Explanation of the labels in the diagram:

[0036] 1. Base; 2. Infusion stand; 3. Pressure regulating assembly; 4. Drive assembly; 5. Infusion bag; 6. Output tube;

[0037] 21. Fixing hoop; 31. Liquid storage tank; 32. Liquid pusher; 33. Liquid outlet; 34. Support column;

[0038] 311. Glass cover; 312. Limiting ring plate; 313. Movable chamber; 314. Groove; 315. Upper monitoring line; 316. Standard line; 317. Lower monitoring line; 321. Piston head one; 322. Push-pull rod; 323. Toothed mouth one; 331. Piston head two; 332. Straight output tube; 333. Fixing block; 334. Piston block; 335. Spring; 336. Monitoring component; 337. Infusion tubing; 338. Discharge channel; 341. Slide rail; 342. Long groove;

[0039] 3301. Fixed plate; 3302. Rotary groove; 3303. Limiting arc groove; 3304. Rotary tube; 3305. Spherical tube; 3306. Drainage channel; 3307. Inlet channel; 3308. Locking block; 3309. Sliding hole; 3310. Movable hole; 3311. Receiving plate; 3312. Insert tube; 3313. Guide rod; 3314. Sliding column; 3315. Guide head; 3316. Guide groove; 3317. Stop bar; 3318. Gear tooth two; 3319. Control gear; 3320. Bevel gear one; 3321. Bevel gear two; 3322. Adjusting gear; 3323. Gear tooth three;

[0040] 401. Motor; 402. Controller; 403. Monitoring frame; 404. Upper sensor; 405. Lower sensor; 406. Wheel frame; 407. Large gear; 408. Transmission gear; 409. Small gear. Detailed Implementation

[0041] like Figures 1 to 15 As shown, the present invention relates to an automatic pressure regulating device for perfusion fluid in shoulder arthroscopy, comprising a base 1, an infusion stand 2 and a pressure regulating assembly 3 arranged on the top of the base 1; the pressure regulating assembly 3 includes a reservoir 31, and a pusher 32 and a dispensing 33 are movably arranged inside the reservoir 31, with the pusher 32 positioned below the dispensing 33; a reservoir chamber is formed between the pusher 32 and the dispensing 33 for storing the perfusion fluid to be dispensed; the pusher 32 and the inner wall of the reservoir 31 form a sliding seal fit, forming a syringe-like variable volume structure; a drive assembly 4 is arranged on the side wall of the infusion stand 2; the drive assembly 4... The device is used to drive the pusher cylinder 32 to slide at a constant speed, decelerate, or accelerate within the cavity of the reservoir cylinder 31. The outlet cylinder 33 includes an outlet channel 338. When the pusher cylinder 32 slides upward within the cavity of the reservoir cylinder 31, it can compress the reservoir chamber, causing the injection fluid to be output through the outlet channel 338. When the hydraulic pressure in the reservoir chamber increases, it can drive the outlet cylinder 33 to rise, and the drive assembly 4 can drive the pusher cylinder 32 to decelerate upward to reduce pressure. When the hydraulic pressure in the reservoir chamber decreases, it can drive the outlet cylinder 33 to fall, and the drive assembly 4 can drive the pusher cylinder 32 to accelerate upward to increase pressure.

[0042] In an embodiment of the present invention, the drive assembly 4 includes a motor 401 and a controller 402 arranged on the side wall of the infusion stand 2, and the controller 402 is electrically connected to the motor 401; the drive assembly 4 also includes a monitoring frame 403 arranged on the other side wall of the infusion stand 2, an upper sensor 404 is installed on the top of the monitoring frame 403, a lower sensor 405 is installed on the bottom of the monitoring frame 403, a monitoring area is formed between the upper sensor 404 and the lower sensor 405, and both the upper sensor 404 and the lower sensor 405 are electrically connected to the controller 402; the upper sensor 404 is used to monitor the upward movement of the infusion cylinder 33, and the lower sensor 405 is used to monitor the downward movement of the infusion cylinder 33. The controller 402, as described in this example, is a prior art device used to receive monitoring signals transmitted from the upper sensor 404 and the lower sensor 405, analyze and process the signals, and determine the hydraulic state in the storage chamber. Simultaneously, the controller 402 outputs corresponding control commands to the motor 401 based on the judgment result, adjusting the output speed of the motor 401. When a signal indicating upward movement of the outlet cylinder 33 is received from the upper sensor 404, indicating excessive hydraulic pressure, the controller 402 instructs the motor 401 to reduce its speed, causing the pusher cylinder 32 to decelerate and slide upward to reduce the output pressure in the storage chamber. When a signal indicating downward movement of the outlet cylinder 33 is received from the lower sensor 405, indicating excessive hydraulic pressure, the controller 402 instructs the motor 401 to increase its speed, causing the pusher cylinder 32 to accelerate and slide upward to increase the output pressure in the storage chamber. When no abnormal signals are received from the upper or lower sensors, the controller 402 maintains the current uniform speed of the motor 401, ensuring the pusher cylinder 32 slides at a uniform speed, thus achieving a stable output of the injection hydraulic pressure.

[0043] In another embodiment of the present invention, the drive assembly 4 further includes a wheel frame 406 arranged on the other side wall of the infusion stand 2. A large gear 407 and a transmission gear 408 are rotatably arranged on the wheel frame 406, and the large gear 407 and the transmission gear 408 are coaxially connected. A small gear 409 is connected to the output end of the motor 401, and the small gear 409 meshes with the large gear 407.

[0044] Furthermore, the pressure regulating assembly 3 also includes a support column 34 arranged on the top of the base 1, a liquid storage cylinder 31 arranged on the top of the support column 34 and installed on the side wall of the infusion stand 2 by multiple fixing brackets 21; a slide rail 341 is arranged on the inner side wall of the support column 34, and a long groove 342 communicating with its inner cavity is opened on the outer circumference of the support column 34; the liquid pushing cylinder 32 is composed of a piston head 321 and a push-pull rod 322, the piston head 321 is connected to the top of the push-pull rod 322, the piston head 321 is slidably sealed in the inner cavity of the liquid storage cylinder 31, a slide groove is opened on one side wall of the push-pull rod 322, and a toothed edge 323 is arranged on the other side wall. The push-pull rod 322 is slidably arranged on the slide rail 341 on the inner side wall of the support column 34 through the slide groove, and the transmission gear 408 is movably arranged in the long groove 342 and meshes with the toothed edge 323.

[0045] It is worth mentioning that the liquid outlet cylinder 33 includes a piston head 331 that is slidably and sealed in the inner cavity of the liquid storage cylinder 31. A straight output pipe 332 is connected to the top of the piston head 331. The inner cavity of the piston head 331 and the inner cavity of the straight output pipe 332 are in a communication state to form a liquid outlet channel 338. A fixing block 333 and a piston block 334 are integrally formed on the outer circumference of the straight output pipe 332. The piston block 334 is arranged above the fixing block 333.

[0046] It is worth noting that a limiting ring plate 312 is arranged on the inner circumference of the reservoir 31, and the piston head 331 is arranged below the limiting ring plate 312. A movable chamber 313 is formed above the limiting ring plate 312. The fixing block 333 and the piston block 334 are both arranged in the movable chamber 313. The fixing block 333 is in clearance fit with the inner side wall of the movable chamber 313, and the piston block 334 is in sliding sealing fit with the inner side wall of the movable chamber 313. The top of the piston block 334 is connected to the top of the movable chamber 313 through a spring 335. The top of the straight output pipe 332 extends to the top of the reservoir 31 and is in clearance fit with the inner side wall of the reservoir 31. The top output end of the straight output pipe 332 is connected to an infusion hose 337, which is used to deliver the infusion fluid to the shoulder joint cavity through an external special infusion catheter.

[0047] It is worth noting that the side wall of the reservoir 31 has a slot 314 communicating with its inner cavity. A monitoring element 336 connected to the side wall of the fixed block 333 is movably arranged in the slot 314. The other end of the monitoring element 336 is arranged in the monitoring area between the upper sensor 404 and the lower sensor 405. The outer circumference of the reservoir 31 has an upper monitoring line 315, a standard line 316 and a lower monitoring line 317. The upper monitoring line 315 is the monitoring range of the upper sensor 404, and the lower monitoring line 317 is the monitoring range of the lower sensor 405. When the hydraulic pressure delivered into the shoulder joint cavity by the infusion tubing 337 meets the standard, the height of the monitoring element 336 on the horizontal plane is aligned with the standard line 316.

[0048] In this invention, the motor 401 meshes with the large gear 407 on the wheel frame 406 via the small gear 409 at its output end, driving the coaxial transmission gear 408 to rotate. The transmission gear 408 meshes with the tooth 323 of the push-pull rod 322 of the liquid-pushing cylinder 32 within the elongated groove 342 of the support column 34. Simultaneously, the push-pull rod 322 slides along the slide rail 341 of the support column 34 via a sliding groove, thereby driving the piston head 321 to slide within the liquid storage cylinder 31. When the piston head 321... When the 21 slides upward, it compresses the storage chamber between itself and the piston head 331 of the outlet cylinder 33, causing the infusion fluid to be output through the outlet channel 338 formed by the piston head 331 and the straight outlet pipe 332, and then delivered to the shoulder joint cavity through the infusion hose 337 and the external special catheter; the limiting ring plate 312 in the storage cylinder 31 restricts the upward movement range of the piston head 331, and the piston block 334 in the movable chamber 313 above it cooperates with the spring 335, when the fluid in the storage chamber... When the pressure increases, the piston head 331, the straight output pipe 332, and the fixing block 333 are pushed upward. The fixing block 333 drives the monitoring element 336 to move upward along the slot 314 to the monitoring range of the upper sensor 404. The upper sensor 404 transmits the signal to the controller 402. The controller 402 instructs the motor 401 to slow down, so that the pusher cylinder 32 decelerates and slides upward to reduce the hydraulic pressure. When the hydraulic pressure in the storage chamber decreases, the elastic force of the spring 335 drives the piston block 334, the straight output pipe 332, and the fixing block 333 to move downward. The monitoring element 336 moves downward to the monitoring range of the lower sensor 405. The lower sensor 405 transmits the signal to the controller 402. The controller 402 instructs the motor 401 to speed up, so that the pusher cylinder 32 accelerates and slides upward to increase the hydraulic pressure. When the hydraulic pressure meets the standard, the monitoring element 336 is aligned with the standard line 316 of the storage cylinder 31. The controller 402 maintains the motor 401 at a constant speed to ensure a stable output of the injection fluid pressure.

[0049] This invention designs a pressure regulating component 3, which utilizes the pusher cylinder 32 and the reservoir cylinder 31 to form a syringe-like variable-volume structure. This, combined with the outlet cylinder 33, constructs a dynamically adjustable pressure reservoir chamber, achieving basic controllability of the infusion fluid output pressure. Simultaneously, the slide rail 341 of the support column 34 in the pressure regulating component 3 slides with the groove of the push-pull rod 322, providing guidance for the stable sliding of the pusher cylinder 32 and ensuring that the pusher cylinder 32 remains sealed while sliding within the reservoir cylinder 31, preventing infusion fluid leakage from affecting pressure stability. The piston head 331 of the outlet cylinder 33 slides and seals against the inner wall of the reservoir cylinder 31. Combined with the synergistic effect of the straight output pipe 332, the fixed block 333, and the piston block 334, this allows for stable delivery of the infusion fluid through the outlet channel 338, and also utilizes the piston block 334 and the movable chamber... The sliding seal of 313 and the elastic reset function of spring 335 convert the hydraulic changes in the reservoir chamber into the lifting and lowering motion of the outlet cylinder 33. Combined with the monitoring element 336 in the groove 314 on the side wall of the reservoir cylinder 31, the hydraulic changes are converted into changes in the height of the monitoring element 336. This allows for direct visual observation and synchronous transmission to the monitoring area of ​​the drive component 4, providing accurate monitoring signals to the upper sensor 404 and the lower sensor 405. Ultimately, this achieves the linkage between the pressure regulating component 3 and the drive component 4, enabling automatic, real-time, and stable adjustment of the infusion hydraulic pressure. This effectively solves the problem of pressure fluctuations caused by traditional manual adjustment of infusion fluid pressure, which is easily affected by surgical operations, changes in patient position, and drops in fluid level in the fluid bag. This provides a stable infusion environment for shoulder arthroscopic surgery, ensuring a clear surgical field and operational safety.

[0050] The present invention also arranges the liquid-pushing cylinder 32 below the liquid-discharging cylinder 33, and arranges the liquid storage chamber for storing the infusion fluid to be output between the liquid-pushing cylinder 32 and the liquid-discharging cylinder 33. When it is necessary to output the infusion fluid, the liquid-pushing cylinder 32 can be driven by the driving component 4 to slide from bottom to top in the inner cavity of the liquid storage cylinder 31, thereby compressing the volume of the liquid storage chamber, so that the infusion fluid in the chamber has output power, and is stably delivered to the shoulder joint cavity through the liquid outlet channel 338 of the liquid outlet cylinder 33. This structural design eliminates the reliance on hydrostatic pressure principles in traditional equipment. Traditional equipment relies on suspending an infusion bag and utilizing the gravitational potential energy created by the bag's height and the liquid level to maintain pressure. However, a drop in the liquid level directly reduces this gravitational potential energy, leading to hydraulic fluctuations. In this design, the hydraulic pressure in the reservoir chamber is independent of the infusion fluid level. It can be precisely controlled simply by adjusting the upward movement speed of the pusher cylinder 32: when the pusher cylinder 32 accelerates upward, the compression rate of the reservoir chamber increases, and the hydraulic pressure rises accordingly; when the pusher cylinder 32 decelerates upward, the compression rate decreases, and the hydraulic pressure decreases accordingly; when the pusher cylinder 32 moves upward at a constant speed, the compression rate of the reservoir chamber remains stable, and the hydraulic pressure remains constant. Even if the infusion fluid volume in the reservoir chamber gradually decreases with output, maintaining the set upward movement speed of the pusher cylinder 32 ensures that the hydraulic pressure remains within the target range. This avoids interference from changes in the infusion fluid level, achieving independent and stable hydraulic control and solving the problems of pressure fluctuations caused by a drop in liquid level, which affect the surgical field of vision and operational safety in traditional equipment.

[0051] In an embodiment of the present invention, a glass cover 311 is arranged on the side wall of the liquid storage cylinder 31. The glass cover 311 is a vertical elongated structure and is used to directly observe the internal cavity of the liquid storage cylinder 31.

[0052] In an embodiment of the present invention, the monitoring component 336 includes a fixing plate 3301 connected to the side wall of the fixing block 333. A rotating groove 3302 is formed on the side wall of the fixing plate 3301. The inner cavity of the fixing block 333 is a spherical chamber. The rotating groove 3302 communicates with the spherical chamber. A limiting arc groove 3303 is formed on the inner side wall of the rotating groove 3302, and the limiting arc groove 3303 has a semi-circular cross-section. A rotating tube 3304 is rotatably sealed within the rotating groove 3302. A spherical tube 3305 is connected to the end of the rotating tube 3304 and is movably arranged on the fixing block 3303. In the spherical chamber of the inner cavity 3, the spherical tube 3305 includes a drain channel 3306 and an inlet channel 3307. The drain channel 3306 has the same diameter as the inner cavity of the straight output tube 332, and the inlet channel 3307 is connected to the inner cavity of the rotating tube 3304. The drain channel 3306 and the inlet channel 3307 are arranged at right angles in the same plane. When the drain channel 3306 is vertical, it can be connected to the inner cavity of the straight output tube 332. At this time, the inlet channel 3307 is horizontal and is closed to the inner cavity of the straight output tube 332.The fixing plate 3301 is connected to the side wall of the fixing block 333, and its side wall groove 3302 is connected to the spherical chamber inside the fixing block 333. A rotating sealed rotating pipe 3304 inside the groove 3302 switches between channel states through the movement of the end spherical pipe 3305 within the spherical chamber. When the equipment is in normal filling state, the drain channel 3306 of the spherical pipe 3305 remains vertical. Because the drain channel 3306 has the same diameter as the inner cavity of the straight output pipe 332, the two are precisely connected. The filling liquid compressed by the pusher cylinder 32 in the storage chamber can smoothly enter the inner cavity of the straight output pipe 332 through the drain channel 3306. The infusion fluid is discharged through the outlet channel 338 and then delivered to the shoulder joint cavity through the infusion tubing 337. At this time, the infusion channel 3307, which is arranged at a right angle to the outlet channel 3306, is in a horizontal state and completely offset from the inner cavity of the straight output tube 332, forming a closed state to prevent leakage or diversion of the infusion fluid from the infusion channel 3307. When it is necessary to replenish the infusion fluid, rotating the rotating tube 3304 drives the spherical tube 3305 to rotate in the spherical cavity, so that the infusion channel 3307 is in a vertical state and the outlet channel 336 is in a horizontal state, that is, the infusion channel 3307 is switched to a state that connects with the inner cavity of the straight output tube 332. When replenishing fluid is connected, the drain channel 3306 simultaneously closes. During this process, the outlet end of the outlet channel 338 formed within the straight outlet tube 332 is also closed, completely blocking the path of air entering the infusion tubing 337 and the external dedicated infusion catheter through the outlet channel 338, thus preventing air from entering the shoulder joint cavity and causing safety hazards such as air embolism. Any small amount of air that may enter during replenishment is confined to the inlet channel 3307 and enters the storage chamber below the straight outlet tube 332. Subsequently, by controlling the pusher cylinder 32 to slide downwards within the storage chamber of the storage cylinder 31, the volume of the chamber can be utilized to expand the production capacity. The negative pressure generated draws external perfusion fluid into the reservoir chamber through the inlet channel 3307, completing the perfusion fluid replenishment. After replenishment, the pusher cylinder 32 is moved upward, compressing the reservoir chamber volume. Internal air is preferentially expelled through the inlet channel 3307 until perfusion fluid seeps out from the inlet channel 3307, indicating that the air in the reservoir chamber has been completely removed, effectively preventing residual air bubbles from affecting the stability of the perfusion pressure. Finally, rotating the rotating tube 3304 again drives the spherical tube 3305 to rotate, closing the inlet channel 3307 and reconnecting the outlet channel 3306 to the inner cavity of the straight outlet tube 332, thus resuming the perfusion fluid injection operation. The entire process does not require disassembling the tubing, realizing an integrated operation of replenishing perfusion fluid, removing air, and restoring perfusion. This ensures the sealing and safety of the perfusion fluid delivery, simplifies the perfusion fluid replenishment operation process during surgery, and reduces interference with the surgical procedure.

[0053] In another embodiment of the present invention, a locking block 3308 is connected to the outer circumference of the rotating tube 3304. The locking block 3308 is movably arranged in the limiting arc groove 3303. The cross-section of the locking block 3308 is formed into a near-right-angled fan-shaped structure. The rotation stroke of the locking block 3308 in the limiting arc groove 3303 is limited to ninety degrees, providing precise limitation on the rotation range of the rotating tube 3304. The inner cavity of the fixing plate 3301 is provided with multiple sliding holes 3309 and multiple movable holes 3310, and the sliding holes 3309 and the movable holes 3310 are in a communicating state. A receiving plate 3311 is arranged on the side of the fixing plate 3301. An insertion tube 3312 is connected to the side wall of the receiving plate 3311. The insertion tube 3312 is inserted into the inner cavity of the rotating tube 3304. The receiving plate 3311 and the insertion tube 3312 are connected to each other. The cavity is in a connected state and forms an insertion channel, which is used for the insertion connection of the output tube head 6 of the infusion bag 5; the side wall of the receiving plate 3311 is also connected with multiple guide rods 3313, and the end of the guide rod 3313 is connected with a sliding column 3314. The guide rod 3313 is movably arranged in the movable hole 3310, and the sliding column 3314 is slidably arranged in the sliding hole 3309; among them, the inner circumference of the rotating tube 3304 is connected with a guide head 3315, and the outer circumference of the insertion tube 3312 is provided with a guide groove 3316. The guide head 3315 can slide and cooperate with the guide groove 3316. When the insertion tube 3312 is inserted into the cavity of the rotating tube 3304, the guide groove 3316 can drive the guide head 3315 to slide along the path in the groove, so that the rotating tube 3304 rotates.When it is necessary to connect the infusion bag 5 to replenish the liquid, insert the output tube 6 of the infusion bag 5 into the insertion channel formed by the receiving plate 3311 and the insertion tube 3312, and then push the receiving plate 3311 so that the receiving plate 3311 drives the insertion tube 3312 into the inner cavity of the rotating tube 3304. During this process, the guide rod 3313 on the side wall of the receiving plate 3311 slides along the movable hole 3310 of the fixed plate 3301, and the sliding column 3314 at the end of the guide rod 3313 slides synchronously in the sliding hole 3309, providing stable guidance for the insertion of the insertion tube 3312 and preventing the insertion tube from deviating; at the same time, the guide head 33 on the inner circumference of the rotating tube 3304... 15 gradually contacts and forms a sliding fit with the guide groove 3316 on the outer circumference of the insertion tube 3312. When the insertion tube 3312 is inserted, the guide groove 3316 drives the guide head 3315 to move through the groove path, thereby driving the rotating tube 3304 to rotate. Due to the 90-degree stroke limitation of the locking block 3308 in the limiting arc groove 3303, the rotating tube 3304 rotates exactly 90 degrees, realizing the precise docking of the liquid inlet channel 3307 of the spherical tube 3305 with the inner cavity of the straight output tube 332, and the simultaneous closure of the drain channel 3306, ensuring that the liquid in the infusion bag 5 can pass through the insertion tube 3312, the rotating tube 3304 and the liquid inlet channel 3312. 07. Stable injection into the reservoir chamber eliminates the need for manual adjustment of the rotating tube angle, improving operational convenience and switching accuracy. When the infusion fluid replenishment is complete, pulling the receiving plate 3311 in the reverse direction causes the insertion tube 3312 to be withdrawn from the inner cavity of the rotating tube 3304. During this process, the guide groove 3316 on the outer wall of the insertion tube 3312 moves with the insertion tube, driving the guide head 3315 on the inner wall of the rotating tube 3304 to slide in the reverse direction, causing the rotating tube 3304 to rotate in the opposite direction. The 90-degree travel limit of the locking block 3308 within the limiting arc groove 3303 ensures that the rotating tube 3304 rotates exactly 90 degrees in the opposite direction, thereby driving the ball... When the straight tube 3305 is reset, the inlet channel 3307 rotates synchronously to a horizontal closed state, offset from the inner cavity of the straight output tube 332. The outlet channel 3306 rotates back to a vertical state, reconnecting precisely with the inner cavity of the straight output tube 332, restoring the injection fluid output function of the outlet channel 338. Then, the output tube head 6 of the injection fluid bag 5 can be pulled out, and the equipment can enter the normal injection state again. The entire replenishment and reset process does not require additional manual adjustment of the channel state, which not only ensures the accuracy of channel switching but also further simplifies the operation process and avoids the risk of injection interruption or air entering the pipeline due to manual adjustment errors.

[0054] In another embodiment of the present invention, a stop bar 3317 is slidably arranged on the side wall of the fixing plate 3301. The stop bar 3317 is arranged below the locking block 3308 and can limit the rotation of the locking block 3308. A toothed joint 3318 is arranged on the top of the stop bar 3317. The toothed joint 3318 is meshed with a control gear 3319. The control gear 3319 is rotatably arranged on the side wall of the fixing plate 3301 and coaxially connected with a bevel gear 3320. The bevel gear 3320 is meshed with a bevel gear 3319. 321, bevel gear 3321 is rotatably arranged on the other side wall of fixed plate 3301, and bevel gear 3321 is coaxially connected to adjusting gear 3322; one of the guide rods 3313 has a toothed mouth 3323 arranged on its side wall. When the insertion tube 3312 and the inner cavity of the rotating tube 3304 form an insertion contact, the toothed mouth 3323 and the adjusting gear 3322 are in a separated state; when the insertion tube 3312 and the inner cavity of the rotating tube 3304 are in a separated state, the toothed mouth 3323 and the adjusting gear 3322 are in a meshing state.The sliding stop 33017 on the side wall of the fixed plate 3301 is located below the locking block 3308. Under normal conditions, it can provide basic limitation for the forward rotation of the locking block 3308, and together with the limiting arc groove 3303, it can limit the reverse rotation of the locking block 3308, preventing the rotating tube 3304 from rotating unexpectedly due to slight vibration of the equipment or hydraulic fluctuations. When it is necessary to connect the filling bag 5 and push the receiving plate 3311 to insert the insertion tube 3312 into the inner cavity of the rotating tube 3304, during the stroke before the insertion tube 3312 is inserted into the inner cavity of the rotating tube 3304, the receiving plate 3311 drives... The guide rod 3313 moves synchronously, and the toothed edge 3323 on the side wall of the guide rod 3313 meshes with the adjusting gear 3322, driving the adjusting gear 3322 to rotate. The adjusting gear 3322 drives the meshing bevel gear 3320 to rotate through the coaxial bevel gear 3321. The bevel gear 3320 drives the coaxial control gear 3319 to rotate. The control gear 3319 drives the stop bar 3317 to slide along the side wall of the fixed plate 3301 to the side position of the locking block 3308 through meshing with the toothed edge 3318, thus releasing the locking block 3308. The rotation limit of 8 does not affect the rotation of the guide groove 3316 driving the rotating tube 3304 during cannula insertion. The locking block 3308 can slide normally along the limiting arc groove 3303. Then, as the cannula 3312 is inserted into the inner cavity of the rotating tube 3304, the toothed joint 3323 and the adjusting gear 3322 are separated. When the infusion fluid is replenished and the receiving plate 3311 is pulled in the opposite direction to pull the cannula 3312 out of the inner cavity of the rotating tube 3304, the toothed joint 3323 moves with the guide rod 33 during the stroke after the cannula 3312 is pulled out of the inner cavity of the rotating tube 3304. 13. The reverse movement re-engages with the adjusting gear 3322. The movement of the guide rod 3313 drives the adjusting gear 3322 to rotate in the opposite direction, thereby synchronously driving the stop bar 3317 to slide along the side wall of the fixed plate 3301 to the limit position below the locking block 3308, forming a reset. This locks the locking block 3308 after the rotation reset, preventing the rotating tube 3304 from rotating unexpectedly during subsequent infusion. This ensures stable communication between the drainage channel 3306 and the inner cavity of the straight output tube 332, further guaranteeing the reliability and safety of the infusion fluid delivery.

[0055] Working Principle: This embodiment provides an automatic pressure regulating device for infusion fluid in shoulder arthroscopy. In use, the output tube head 6 of the infusion fluid bag 5 is first inserted into the insertion channel of the receiving plate 3311. The receiving plate 3311 is pushed to insert the insertion tube 3312 into the inner cavity of the rotating tube 3304. Through the cooperation of the guide groove 3316 and the guide head 3315, the rotating tube 3304 is driven to rotate 90 degrees, allowing the inlet channel 3307 to connect with the inner cavity of the straight output tube 332. Then, the push-pull rod 322 of the pusher cylinder 32 is driven downwards, using the negative pressure of the storage chamber to draw the infusion fluid into the chamber. After replenishment, the receiving plate 3311 is pulled in the opposite direction to reset the rotating tube 3304, and the drainage channel 3306 reconnects with the straight output tube 332. Subsequently, the motor 401, through the small gear 409 and the large gear 40... 7 and transmission gear 408 drive push-pull rod 322 to drive piston head 321 to slide upward, compressing the reservoir chamber so that the infusion fluid is delivered to the shoulder joint cavity through the outlet channel 338 and infusion tubing 337; during the operation, if the hydraulic pressure in the reservoir chamber increases, it will push piston head 331 of outlet cylinder 33 to move the fixed block 333 upward, the monitoring element 336 triggers upper sensor 404, and controller 402 instructs motor 401 to slow down so that push cylinder 32 decelerates and slides upward to reduce pressure; if the hydraulic pressure decreases, the elastic force of spring 335 is greater than the standard hydraulic pressure, driving piston block 334 to move fixed block 333 downward, the monitoring element 336 triggers lower sensor 405, and controller 402 instructs motor 401 to speed up so that push cylinder 32 accelerates and slides upward to increase pressure, always maintaining stable infusion pressure.

[0056] The embodiments disclosed in this invention are preferred embodiments, but are not limited thereto. Those skilled in the art can easily understand the spirit of this invention based on the above embodiments and make different extensions and variations, but as long as they do not depart from the spirit of this invention, they are all within the protection scope of this invention.

Claims

1. An automatic pressure regulating device for arthroscopic shoulder surgery perfusion fluid, characterized by, It comprises a base (1), the top of which is provided with an infusion stand (2) and a pressure regulating assembly (3); The pressure regulating assembly (3) comprises a liquid storage cylinder (31), the inner cavity of which is movably provided with a liquid pushing cylinder (32) and a liquid outlet cylinder (33), the liquid pushing cylinder (32) being arranged below the liquid outlet cylinder (33); a liquid storage chamber is formed between the liquid pushing cylinder (32) and the liquid outlet cylinder (33), which is used for storing the perfusion liquid to be output; The liquid pushing cylinder (32) forms a sliding sealing fit with the inner wall of the liquid storage cylinder (31), forming a needle syringe type variable volume structure; The side wall of the infusion stand (2) is provided with a driving assembly (4); the driving assembly (4) is used to drive the liquid pushing cylinder (32) to slide at a constant speed, a deceleration or an acceleration in the inner cavity of the liquid storage cylinder (31); The liquid outlet cylinder (33) comprises a liquid outlet channel (338), when the liquid pushing cylinder (32) slides upward in the inner cavity of the liquid storage cylinder (31), the liquid storage chamber can be compressed to make the perfusion liquid output through the liquid outlet channel (338); When the liquid pressure in the liquid storage chamber rises, it can drive the liquid outlet cylinder (33) to rise, and the driving assembly (4) can drive the liquid pushing cylinder (32) to form a deceleration upward sliding state to reduce the pressure; when the liquid pressure in the liquid storage chamber drops, it can drive the liquid outlet cylinder (33) to drop, and the driving assembly (4) can drive the liquid pushing cylinder (32) to form an acceleration upward sliding state to increase the pressure.

2. The automatic pressure regulating device for arthroscopic shoulder surgery according to claim 1, wherein The driving assembly (4) comprises a motor (401) and a controller (402) arranged on the side wall of the infusion stand (2), the controller (402) being electrically connected with the motor (401); The driving assembly (4) further comprises a monitoring frame (403) arranged on the other side wall of the infusion stand (2), the top of the monitoring frame (403) being provided with an upper sensor (404), and the bottom of the monitoring frame (403) being provided with a lower sensor (405); a monitoring area is formed between the upper sensor (404) and the lower sensor (405), and the upper sensor (404) and the lower sensor (405) are both electrically connected with the controller (402); the upper sensor (404) is used to monitor the upward movement state of the liquid outlet cylinder (33), and the lower sensor (405) is used to monitor the downward movement state of the liquid outlet cylinder (33).

3. The automatic pressure regulating device for arthroscopic shoulder surgery according to claim 2, wherein The driving assembly (4) further comprises a wheel frame (406) arranged on the other side wall of the infusion stand (2), a large gear (407) and a transmission gear (408) being rotatably arranged on the wheel frame (406), the large gear (407) and the transmission gear (408) being coaxially connected; a small gear (409) is connected with the output end of the motor (401), and the small gear (409) is meshingly connected with the large gear (407).

4. The automatic pressure regulating device for arthroscopic shoulder surgery according to claim 3, wherein The pressure regulating assembly (3) further comprises a support column (34) arranged on the top of the base (1), and the liquid storage cylinder (31) is arranged on the top of the support column (34) and is installed on the side wall of the infusion stand (2) through a plurality of fixed hoops (21); The inner cavity side wall of the support column (34) is arranged with a sliding rail (341), and the circumferential outer wall of the support column (34) is provided with a long slot (342) in communication with the inner cavity thereof; The liquid pushing cylinder (32) is composed of a first piston head (321) and a push-pull rod (322), the first piston head (321) is connected to the top of the push-pull rod (322), the first piston head (321) is slidingly and sealingly arranged in the inner cavity of the liquid storage cylinder (31), the push-pull rod (322) is provided with a sliding groove on one side wall and a tooth gap (323) on the other side wall, the push-pull rod (322) is slidingly arranged on the sliding rail (341) of the inner cavity side wall of the support column (34) through the sliding groove, and the transmission gear (408) is movably arranged in the long slot (342) and is in meshing connection with the tooth gap (323).

5. The automatic pressure regulating device for arthroscopic shoulder surgery according to claim 4, wherein The liquid outlet cylinder (33) comprises a second piston head (331) slidingly and sealingly arranged in the inner cavity of the liquid storage cylinder (31), a straight output pipe (332) connected to the top of the second piston head (331), and the inner cavity of the second piston head (331) is in communication with the inner cavity of the straight output pipe (332) to form the liquid outlet channel (338); the circumferential outer wall of the straight output pipe (332) is integrally formed with a fixed block (333) and a piston block (334), and the piston block (334) is arranged above the fixed block (333); The circumferential inner wall of the liquid storage cylinder (31) is arranged with a limiting ring plate (312), and the second piston head (331) is arranged below the limiting ring plate (312); an active cavity (313) is formed above the limiting ring plate (312), the fixed block (333) and the piston block (334) are arranged in the active cavity (313), the fixed block (333) is in clearance fit with the inner side wall of the active cavity (313), and the piston block (334) is in sliding sealing fit with the inner side wall of the active cavity (313); the top of the piston block (334) is connected to the inner top of the active cavity (313) through a spring (335); the top of the straight output pipe (332) extends above the liquid storage cylinder (31) and is in clearance fit with the inner side wall of the liquid storage cylinder (31), the top output end of the straight output pipe (332) is connected with an infusion hose (337), and the infusion hose (337) is used for conveying the perfusion liquid to the shoulder joint cavity through an external special perfusion catheter.

6. The automatic pressure regulating device for arthroscopic shoulder surgery according to claim 5, wherein The side wall of the liquid storage cylinder (31) is provided with a slot (314) in communication with the inner cavity thereof, and a monitoring member (336) connected with the side wall of the fixed block (333) is movably arranged in the slot (314), and the other end of the monitoring member (336) is arranged in a monitoring area between the upper sensor (404) and the lower sensor (405); The monitoring member (336) is arranged on the side wall of the liquid storage cylinder (31) and comprises a fixed plate (3301) connected with the side wall of the fixed block (333), a rotating groove (3302) is arranged on the side wall of the fixed plate (3301), the inner cavity of the fixed block (333) is a spherical cavity, the rotating groove (3302) is in communication with the spherical cavity, a limiting arc groove (3303) is arranged on the inner side wall of the rotating groove (3302), and the limiting arc groove (3303) is in a half-circular shape in cross section.

7. The automatic pressure regulating device for arthroscopic shoulder surgery according to claim 6, wherein The rotating groove (3302) is rotatably sealed with a rotating pipe (3304), the end of the rotating pipe (3304) is connected with a spherical pipe (3305), the spherical pipe (3305) is movably arranged in the spherical cavity in the inner cavity of the fixed block (333), the spherical pipe (3305) comprises a liquid discharge channel (3306) and a liquid inlet channel (3307), the liquid discharge channel (3306) has the same inner diameter as the inner cavity of the straight output pipe (332), and the liquid inlet channel (3307) is in communication with the inner cavity of the rotating pipe (3304).

8. The automatic pressure regulating device for arthroscopic shoulder surgery according to claim 7, wherein The liquid discharge channel (3306) and the liquid inlet channel (3307) are arranged at a right angle in the same plane; when the liquid discharge channel (3306) is in a vertical state, the liquid discharge channel (3306) and the liquid inlet channel (3307) are in communication with the inner cavity of the straight output pipe (332), at this time, the liquid inlet channel (3307) is in a horizontal state and is in a closed state with the inner cavity of the straight output pipe (332). The rotating pipe (3304) is connected with a clamping block (3308) on the circumferential outer wall, the clamping block (3308) is movably arranged in the limiting arc groove (3303), and the rotating stroke of the clamping block (3308) in the limiting arc groove (3303) is limited to ninety degrees. The inner cavity of the fixed plate (3301) is arranged with a plurality of sliding holes (3309) and a plurality of movable holes (3310), and the sliding holes (3309) are in communication with the movable holes (3310).

9. The automatic pressure regulating device for arthroscopic shoulder surgery according to claim 8, wherein The fixed plate (3301) is arranged with a receiving disc (3311) on the side, the receiving disc (3311) is connected with a plug pipe (3312) on the side wall, the plug pipe (3312) is inserted and matched with the inner cavity of the rotating pipe (3304), the inner cavities of the receiving disc (3311) and the plug pipe (3312) are in communication and form an insertion channel, and the insertion channel is used for inserting and connecting the output pipe head (6) of the infusion bag (5). ​ ​ The side wall of the receiving disc (3311) is further connected with a plurality of guide rods (3313), the end of the guide rod (3313) is connected with a sliding column (3314), the guide rod (3313) is movably arranged in the movable hole (3310), and the sliding column (3314) is slidably arranged in the sliding hole (3309). The circumferential inner wall of the rotating pipe (3304) is connected with a guide head (3315), the circumferential outer wall of the insertion pipe (3312) is provided with a guide groove (3316), the guide head (3315) can be slidably matched with the guide groove (3316), when the insertion pipe (3312) is inserted into the inner cavity of the rotating pipe (3304), the guide groove (3316) can drive the guide head (3315) to slide along the path in the groove, so that the rotating pipe (3304) rotates.

10. The automatic pressure regulating device for arthroscopic shoulder surgery according to claim 9, wherein The side wall of the fixed plate (3301) is slidably arranged with a blocking strip (3317), the blocking strip (3317) is arranged below the clamping block (3308) and can limit the rotation of the clamping block (3308); the top of the blocking strip (3317) is arranged with a second tooth gap (3318), the second tooth gap (3318) is engagedly connected with a control gear (3319), the control gear (3319) is rotatably arranged on the side wall of the fixed plate (3301) and coaxially connected with a bevel gear one (3320), the bevel gear one (3320) is engagedly connected with a bevel gear two (3321), the bevel gear two (3321) is rotatably arranged on the other side wall of the fixed plate (3301), and the bevel gear two (3321) is coaxially connected with an adjusting gear (3322). The side wall of one of the guide rods (3313) is arranged with a third tooth gap (3323), when the insertion pipe (3312) and the inner cavity of the rotating pipe (3304) are in a plug-in contact, the third tooth gap (3323) and the adjusting gear (3322) are in a separated state; when the insertion pipe (3312) and the inner cavity of the rotating pipe (3304) are in a separated state, the third tooth gap (3323) and the adjusting gear (3322) are in an engaged state.

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