Intra-articular pressure-adjustable balloon expander for knee joint

Abstract

The present invention discloses an adjustable pressure balloon expander for a knee joint, comprising a minimally invasive puncture balloon unit and an adjustable pressure injector unit connected to and injecting a fluid into the minimally invasive puncture balloon unit, wherein the adjustable pressure injector unit is connected to the minimally invasive puncture balloon unit via an extension tube; the minimally invasive puncture balloon unit comprises a puncture spindle tube for puncturing into the knee joint, a through hole is provided at the side wall of the end of the puncture spindle tube, and the periphery of the through hole is coated with a soft balloon for opening under the action of the injected fluid to expand the knee joint compartment. The adjustable pressure balloon expander for a knee joint provided by the present invention is simple to operate and easy to use, and is convenient for expanding the knee joint compartment through a minimally invasive incision, can accurately control the supporting force, disperse the stress of the supporting part, and can be operated within the safe range of the articular cartilage, meniscus and ligament, thereby reducing the difficulty of knee joint surgery, improving the efficiency of surgery and accelerating postoperative recovery.

Description

Technical Field

[0001] The invention relates to the technical field of medical equipment, and in particular to an intra-knee joint pressure-adjustable balloon expander. Background Art

[0002] Knee arthroscopy is a rod-shaped optical instrument with a diameter of about 5 mm that uses various supporting devices such as an endoscopic camera system, light source system, and irrigation system to observe the internal structure of the joint. It can examine and treat intra-articular diseases. Knee arthroscopy is a minimally invasive surgery.

[0003] During the arthroscopic repair of the posterior horn injury of the meniscus, an incision about 0.5-1 cm long is made at the "soft spot" on the inside and outside of the knee joint. When exploring the lateral compartment of the knee joint, the knee joint needs to be placed in a "4" shape, and the knee joint needs to be pressed to apply an inward valgus force to open the lateral compartment; when exploring the medial compartment of the knee joint, the knee joint needs to be placed in a flexed position of 10-30° and an outward valgus force needs to be applied, while keeping the tibia in a slightly externally rotated position to facilitate smooth exploration. Patients with more posterior horn injuries of the meniscus also have joint contractures, which makes it difficult to expose the posterior horn of the meniscus, especially the posteromedial horn injury of the medial meniscus. Because it is close to the midline of the joint, the anatomical position is very special, and the medial space is relatively narrow, a large knee valgus stress is required to expose the joint space. Even if the patient does not have joint contracture, the posteromedial angle cannot be well exposed due to its anatomical limitations. Excessive valgus may cause damage to the medial collateral ligament, further increase joint instability, and increase the difficulty of operation. It makes it impossible for operators to effectively use conventional methods for meniscus repair and suture treatment, and even forms "technical neglect of treatment". In the treatment of lateral meniscus injuries, the "4" font position is used to expose the joint space, and the varus stress cannot be accurately controlled, and the damage to the lateral collateral ligament caused by body position cannot be well controlled.

[0004] To solve the above problems, people have made various technical improvements and adopted various supports to open the knee joint. However, there is stress concentration in the supporting part, and the supporting force cannot be accurately controlled, which increases the damage to the articular cartilage, meniscus and ligaments. In addition, the support device is large in design and inconvenient to operate, resulting in a large surgical incision and occupying a large space in the joint, which easily blocks the surgical operation space and cannot increase the exposure range of the meniscus, which is not conducive to minimally invasive surgery.

[0005] Therefore, how to safely and effectively open the knee joint and reduce the difficulty of intra-articular knee surgery has become a technical problem that needs to be solved by technical personnel in this field. Summary of the invention

[0006] The purpose of the present invention is to provide an adjustable pressure balloon expander in the knee joint, which can increase the exposure range of the knee joint compartment and the posterior horn of the meniscus, making it convenient to perform various minimally invasive joint surgeries under knee arthroscopy.

[0007] To achieve the above-mentioned object, the present invention provides an adjustable pressure balloon expander for a knee joint, comprising a minimally invasive puncture balloon unit and an adjustable pressure injector unit connected to and injecting a fluid into the minimally invasive puncture balloon unit, wherein the adjustable pressure injector unit is connected to the minimally invasive puncture balloon unit via an extension tube;

[0008] The minimally invasive puncture balloon unit comprises a puncture main shaft tube for puncturing into the knee joint, a through hole is provided on the side wall at the end of the puncture main shaft tube, and the periphery of the through hole is covered with a soft balloon for expanding under the action of injected fluid to open the knee joint compartment.

[0009] Optionally, the adjustable pressure-type syringe unit includes a syringe, a booster screw disposed in the syringe, a booster mechanism for pushing the booster screw to move toward the syringe, and an anti-retraction mechanism for preventing the booster screw from retreating from the syringe.

[0010] Optionally, the puncture main shaft tube is an L-shaped puncture tube, and the soft balloon is arranged on the shorter side of the L-shaped puncture tube.

[0011] Optionally, the boost screw is provided with a rack extending along its length direction, and the boost mechanism includes a fixed handle connected to one side of the injection barrel, a movable handle rotatably connected to the fixed handle, and a wrench provided at an end away from the movable handle, connected to the movable handle and used to engage with the rack to push the boost screw to feed.

[0012] Optionally, the anti-backward mechanism comprises an inner sleeve column for being nested in the injection barrel, and an outer sleeve column fixedly connected to the inner sleeve column and for being clamped on the outside of the injection barrel;

[0013] The inner sleeve column and the outer sleeve column are provided with sleeve column holes for the booster screw to pass through, the outer sleeve column is provided with a slide groove extending in its radial direction, a stopper button and an elastic member connected to the stopper button are provided in the slide groove, and the stopper button is provided with a stopper hole;

[0014] The block hole overlaps with the sleeve hole when the block button is pressed to allow the booster screw to feed, and the block hole is misaligned with the sleeve hole when the elastic member pushes the block button to form a stop for the booster screw.

[0015] Optionally, a pressure control mechanism is connected to the side wall of the injection barrel, and the pressure control mechanism is a pressure gauge connected to the injection barrel.

[0016] Optionally, a vent hole is provided on the side wall of the injection barrel, and a one-way valve and a valve cover cooperating with the one-way valve to seal the vent hole are provided at the vent hole.

[0017] Optionally, the boost mechanism further comprises a fixing tube disposed on the periphery of the boost screw and connected to the anti-backward mechanism;

[0018] One side of the fixing tube is provided with an opening for the wrench to pass through and overlap the rack, and the other side of the fixing tube is provided with a square positioning tooth, and also includes a fine-tuning switch matched with the square positioning tooth;

[0019] An adjusting tube is sleeved on the periphery of the boosting screw, and the adjusting tube is arranged in the fixed tube. The fine-tuning switch includes an anti-slip push button at the first end and a concave clamping portion at the second end. The middle part of the fine-tuning switch is rotatably connected to the adjusting tube. When the anti-slip push button is pressed, the concave clamping portion cooperates with the square positioning teeth to drag the adjusting tube relative to the boosting screw to cover the number of teeth of the rack exposed by the opening.

[0020] Optionally, the adjustable pressure-type syringe unit and the extension tube are connected via a tee, and a third interface of the tee is provided with a one-way valve and a sealing mechanism.

[0021] Optionally, a fixing knob is provided at the end of the boost screw.

[0022] Compared with the above-mentioned background technology, the adjustable pressure balloon expander for the knee joint provided by the present invention includes a minimally invasive puncture balloon unit and an adjustable pressure syringe unit, which can be connected by an extension tube. The minimally invasive puncture unit punctures the knee joint compartment through the puncture spindle tube, and the fluid is injected into the minimally invasive puncture unit through the adjustable pressure syringe unit. The fluid expands the soft balloon through the through hole at the end of the puncture spindle tube. The soft balloon is in surface contact with the joint surface in the joint, and the joint is evenly pressurized. The pressure can be controlled by the pressure of the injected fluid, avoiding stress concentration and excessive pressure, and the design is safer; the puncture spindle tube is used for minimally invasive puncture, which reduces the patient's pain and facilitates postoperative recovery; when the soft balloon is expanded, it can fully expand the posterior medial and posterolateral gaps of the knee joint compartment, increase the exposure range of the knee joint compartment and the posterior horn of the meniscus, and facilitate various minimally invasive joint surgeries in cooperation with the knee arthroscopy, avoiding mutual interference between instruments such as the knee arthroscopy, reducing the difficulty of the operation, and improving the efficiency and safety of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0024] Figure 1A schematic diagram of an adjustable pressure balloon expander for a knee joint provided by an embodiment of the present invention;

[0025] Figure 2 for Figure 1 Schematic diagram of the soft balloon of the minimally invasive puncture balloon unit when closed;

[0026] Figure 3 for Figure 1 Schematic diagram of the soft balloon of the minimally invasive puncture balloon unit when it is expanded;

[0027] Figure 4 for Figure 1 Schematic diagram of the middle extension tube;

[0028] Figure 5 for Figure 1 Schematic diagram of the middle tee;

[0029] Figure 6 for Figure 1 Schematic diagram of the adjustable pressure injector unit;

[0030] Figure 7 for Figure 6 A top view of the middle anti-retraction mechanism;

[0031] Figure 8 for Figure 6 Side view of the middle anti-retraction mechanism;

[0032] Fig. 9 It is a top view of the fine-tuning switch at the fixed tube;

[0033] Fig.10 for Figure 6 A partial enlarged view of the middle A part;

[0034] Fig.11 Schematic diagram of the booster screw.

[0035] in:

[0036] 1-puncture spindle tube, 2-soft balloon, 3-male Luer connector, 4-female Luer connector, 5-tee, 6-one-way valve, 7-one-way flap, 8-flap cover, 9-extension tube, 10-syringe, 11-boost screw, 12-pressure gauge, 13-exhaust hole, 14-rubber plug, 15-push handle, 16-inner sleeve column, 17-outer sleeve column, 18-block button, 19-elastic part, 20-fixed tube, 21-fixed handle, 22-movable handle, 23-handle pin, 24-wrench, 25-rack, 26-fixed knob, 27-anti-slip push button, 28-concave clamping part, 29-square positioning tooth, 30-rotating cap, 31-adjusting tube. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0039] Please refer to Figures 1 to 11 , Figure 1 This is a schematic diagram of an adjustable pressure balloon expander for a knee joint provided by an embodiment of the present invention. Figure 2 for Figure 1 Schematic diagram of the soft balloon of the minimally invasive puncture balloon unit when closed. Figure 3 for Figure 1 Schematic diagram of the soft balloon of the minimally invasive puncture balloon unit when it is expanded. Figure 4 for Figure 1 Schematic diagram of the middle extension tube, Figure 5 for Figure 1 Schematic diagram of the middle three-way, Figure 6 for Figure 1 Schematic diagram of the adjustable pressure injector unit. Figure 7 for Figure 6 Top view of the central anti-retraction mechanism. Figure 8 for Figure 6 Side view of the middle anti-retraction mechanism. Fig. 9 This is a top view of the fine-tuning switch at the fixed tube. Fig.10 for Figure 6 A partial enlarged view of the middle A part. Fig.11 Schematic diagram of the booster screw.

[0040] The adjustable pressure balloon expander for the knee joint provided by the present invention comprises a minimally invasive puncture balloon unit and an adjustable pressure injector unit for injecting fluid into the minimally invasive puncture balloon unit to expand the soft balloon 2 of the minimally invasive puncture balloon unit. The fluid enters the puncture spindle tube 1 through the extension tube 9 and is injected into the soft balloon 2 through the through hole at the end of the puncture spindle tube 1. The fluid can be gas or liquid, and physiological saline is usually used. After the soft balloon 2 is opened, the knee joint compartment is expanded, and uniform expansion is achieved through surface-to-surface contact with the knee joint compartment to avoid stress concentration. The expansion tension is adjusted by adjusting the fluid injection pressure to avoid damage to the knee joint, avoid mutual interference of instruments such as knee arthroscopy in the knee joint compartment, and reduce the difficulty of surgery.

[0041] The following is a more detailed introduction to the knee joint pressure-adjustable spreader provided by the present invention in conjunction with the accompanying drawings and specific embodiments.

[0042] In a specific embodiment provided by the present invention, Figures 1 to 5 As shown, the puncture spindle tube 1 is an L-shaped puncture tube, and one end of the longer side of the L-shaped puncture tube is connected by a tee 5 and an extension tube 9. The puncture spindle tube 1 is used to penetrate the inner compartment of the knee joint, and the soft balloon 2 is arranged around the shorter side of the L-shaped puncture tube, the end of the shorter side is sealed, and a through hole is opened around the periphery. The soft balloon 2 covers the through hole setting and can be opened under the action of the passing fluid; the soft balloon 2 is made of a high pressure resistant and good bioaffinity material. The diameter of the puncture spindle tube 1 is usually set at about 3mm, which is convenient for inserting into the knee joint compartment through a minimally invasive incision and shortening the patient's postoperative recovery time. In the actual treatment process, the puncture spindle tube 1 has a variety of specifications, and the puncture spindle tube 1 of a suitable length can be selected according to the patient's body shape. The shape of the puncture spindle tube 1 can also be flexibly set as needed to ensure that its end can extend into the knee joint compartment and open the knee joint compartment through the soft balloon 2.

[0043] The first interface and the second interface of the tee 5 are connected to the extension tube 9 and the puncture main shaft tube 1 respectively, and are both connected in the form of a male Luer connector 3 and a female Luer connector 4. The third interface of the tee 5 is provided with a one-way sealing mechanism for sealing, which can be opened to discharge the gas in the extension tube 9 and the soft balloon 2 when necessary. A one-way valve 6 is provided in the first interface of the tee 5 used to connect the extension tube 9. The one-way sealing mechanism includes the one-way valve 6, a one-way flap 7 provided at the third interface, and a flap cover 8 that cooperates with the one-way flap 7 to seal the third interface. Therefore, after the soft balloon 2 is expanded to the full extent, the one-way valve 6 in the tee 5 is closed to maintain the pressure in the soft balloon 2 and ensure that the expansion degree of the knee joint compartment remains unchanged.

[0044] Please refer to further Figures 6 to 11 The adjustable pressure-adjustable syringe unit mainly includes a syringe 10, a booster screw 11 in the syringe 10, a main push unit for pushing the booster screw 11 toward the syringe 10, and an anti-retraction unit for preventing the booster screw 11 from retreating from the syringe 10. The front end of the booster screw 11 is provided with a push handle 15, a rubber plug 14, and a rotating cap 30 connected to the push handle 15 for fixing the rubber plug 14. The end of the booster screw 11 is provided with a fixing knob 26, and the booster screw 11 can be rotated circumferentially relative to the syringe 10 by turning the fixing knob 26.

[0045] The syringe 10 and the extension tube 9 are connected in the form of a male Luer connector 3 and a female Luer connector 4. In order to control the injection pressure, the syringe 10 is connected to a pressure control unit. The pressure control unit specifically adopts a pressure gauge 12 arranged at the front end of the syringe 10 and connected to the syringe 10. When the booster screw 11 is pushed to drive the rubber stopper 14 to move toward the inside of the syringe 10, the fluid pressure in the syringe 10 increases, and the soft balloon 2 is injected through the extension tube 9, the one-way valve 6, and the puncture main shaft tube 1 to expand the soft balloon 2. At the same time, it is injected into the pressure gauge 12, which intuitively displays the injection pressure and facilitates the control of the pressure in the soft balloon 2.

[0046] When physiological saline is used as the fluid, the pressure gauge 12 is an instrument for measuring the liquid pressure. At this time, an exhaust hole 13 is also provided on one side of the syringe 10. The exhaust hole 13 can be sealed by a one-way valve 7 and a valve cover 8 that cooperates with the one-way valve 7. When needed, it can be opened to discharge the bubbles contained in the liquid in the syringe 10. When the fluid is gas, the exhaust hole 13 is sealed and the pressure gauge 12 uses a barometer.

[0047] The anti-retraction unit includes an inner sleeve column 16 and an outer sleeve column 17. The inner sleeve column 16 is used to extend into and be nested in the syringe 10. The outer sleeve column 17 is connected to the inner sleeve column 16. The outer sleeve column 17 is stuck outside the syringe 10. The inner sleeve column 16 and the outer sleeve column 17 are provided with sleeve column holes extending along the axial direction of the two, so that the booster screw 11 can pass through. In order to prevent the booster screw 11 from retreating and the fluid in the soft balloon 2 from flowing back to the syringe 10 to cause the soft balloon 2 to shrink, the inner sleeve column 16 is provided with an anti-slip gasket on its periphery, and the outer sleeve column 17 is provided with a slide groove extending along its radial direction. A block button 18 is provided in the slide groove. The block button 18 is connected to an elastic member 19 such as a spring, and the block button 18 is provided with a block hole. When the booster screw 11 is not pushed, under the elastic force of the elastic member 19, the block button 18 protrudes out of the slide groove, and the block hole on the block is misaligned with the sleeve hole, thereby blocking the booster screw 11; when the booster screw 11 needs to be pushed, the block button 18 is pressed, the block hole and the sleeve hole coincide, that is, are aligned, and the booster screw 11 can be fed freely; after the booster screw 11 moves into place, the block button 18 is released, and under the elastic force of the elastic member 19, the block hole and the sleeve hole are misaligned again, blocking the booster screw 11 and preventing the booster screw 11 from retreating.

[0048] Furthermore, the inner edge of the block hole adopts a sloped design and is tilted from top to bottom; in other words, the aperture of the block hole gradually decreases from top to bottom, so that when the booster screw 11 moves forward (moves into the injection barrel 10), the block button 18 is automatically pushed to compress the elastic part 19, and there is no need to press the block button 18 for a long time.

[0049] The anti-retraction unit can not only realize the locking and free feeding of the booster screw 11 by misaligning and aligning the sleeve hole and the block hole, but also adopt the following structure: a screw hole extending along the radial direction of the outer sleeve 17 is provided, the screw hole penetrates the sleeve hole, and a stop bolt is arranged in the screw hole. The stop bolt is rotated and pressed on the side wall of the booster screw 11 to lock the booster screw 11, thereby realizing the anti-retraction function. Furthermore, the end of the stop bolt can be a semi-cylindrical concave that matches the booster screw 11.

[0050] There is a problem that the feeding amount is difficult to control by manually pushing the boost screw 11, and the opening degree of the soft balloon 2 is inconvenient to control. Therefore, the present invention sets a boost unit to regulate the feeding amount of the boost screw 11. The boost screw 11 is provided with a rack 25 extending along its length direction. Specifically, the boost screw 11 is semi-cylindrical, and the rack 25 is provided on the side plane of the semi-cylinder. The boost unit includes a fixed handle 21 fixed to one side of the syringe 10, a movable handle 22 that is rotatably connected to the fixed handle 21, and the movable handle 22 and the fixed handle 21 are rotatably connected by a handle pin 23 to form a lever with the handle pin 23 as a fulcrum. The movable handle 22 is connected to one end of the boost screw 11 for engaging with the rack 25, and the wrench 24 is driven by rotating the movable handle 22 to push the screw forward. In specific implementation, the rack 25 usually adopts an equidistant rack 25. The wrench 24 can be made relative to the rack 25 by rotating the fixed knob 26.

[0051] In another specific embodiment provided by the present invention, the boosting unit also includes a fixed tube 20, which is arranged on the periphery of the boosting screw 11, and can be specifically sleeved on the outer sleeve column 17. An opening is opened on one side of the fixed tube 20, and the length of the opening can be set to the length of five tooth pitches in the rack 25. The wrench 24 can be extended into the fixed tube 20 through the opening to cooperate with the rack 25.

[0052] At this time, the wrench 24 and the movable handle 22 are connected by rotation, and a torsion spring is arranged on the connecting pin shaft, so that the wrench 24 can automatically rotate toward the direction close to the rack 25.

[0053] A square positioning tooth 29 is arranged on the other side of the fixed tube 20. The square positioning tooth 29 can be arranged in five numbers. Usually, the pitch of the square positioning tooth 29 is equal to the pitch of the rack 25 on the booster screw 11. An adjustment tube 31 for shielding the rack 25 is sleeved on the booster screw 11. The fine-tuning switch cooperates with the square positioning tooth 29 to drive the adjustment tube to move toward the opening to shield the number of teeth exposed to the opening.

[0054] Specifically, the adjusting tube 31 is connected to the fine-tuning switch, the middle section of the fine-tuning switch is rotated to connect to the adjusting tube 31, and a reset torsion spring is arranged at the connection; the first end of the fine-tuning switch is provided with an anti-slip push button 27, and the other end is provided with a concave clamping portion 28 that cooperates with the square positioning teeth 29. By pressing the anti-slip push button 27 to make the concave clamping portion 28 cooperate with the square positioning teeth 29, the adjusting tube 31 is dragged to move relative to the booster screw 11 in the direction of the opening, thereby forming a shielding for the number of teeth of the rack 25 exposed to the opening.

[0055] When the number of teeth of the rack 25 exposed in the opening is 5 teeth, a single rotation of the movable handle 22 drives the wrench 24 to cooperate with the rack 25, and the booster screw 11 can feed 5 pitches. When the adjusting tube 31 blocks part of the rack 25, such as only 1 or 2 teeth of the opening are exposed, a single rotation of the movable handle 22 can only feed 1 or 2 pitches. The pressure control accuracy in the injection barrel 10 is improved. The concave clamping part 28 is used to cooperate with the square positioning teeth 29. The anti-slip push button 27 and the middle section of the concave clamping part 28 are rotated and fixed to the adjusting tube 31 to form a lever. When the anti-slip push button 27 is pressed inwardly, the concave clamping part 28 moves outward, and the adjusting tube 31 is driven to move relative to the booster screw 11 through the repeated movement of the concave clamping part 28. The reset torsion spring plays an automatic reset role after pressing, which is convenient for continuous pressing.

[0056] The coarse adjustment and fine adjustment of the feeding amount of the booster screw 11 can also be set with reference to the feeding adjustment method of the microscope barrel, in order to more accurately control the pressure inside the injection barrel 10 and the soft balloon 2, which will not be elaborated here.

[0057] The minimally invasive puncture balloon unit of the present invention can insert the soft balloon 2 at the distal end into the joint through the puncture main shaft tube 1 in the middle part. It is located on both sides of the joint cavity, reserving sufficient space for arthroscopic instrument operation. When the knee joint is flexed 90°, the knee joint compartment is expanded, and the posteromedial and posterolateral gaps can be fully expanded, thereby increasing the exposure range of the joint compartment and the posterior horn of the meniscus, making it convenient to perform various minimally invasive joint surgeries under knee arthroscopy.

[0058] The diameter of the puncture main shaft tube 1 is about 3mm, the puncture wound is small, the trauma to the joint is small, and the wound does not need to be sutured after the operation. After the aligning is done, it can be fixed with a sterile dressing.

[0059] During the operation, the patient is positioned with the knee flexed at 90° and the calf hanging freely. There is no need to change the position multiple times during the exploration of the medial and lateral compartments and exposure of the posterior horn of the meniscus. The above position is adopted from the beginning to the end of the operation. The operation is convenient, the surgical field is fully exposed, the technical requirements for the operator are low, the operation time is reduced, and the doctor's work efficiency is improved.

[0060] The puncture main shaft tube 1 is designed to be L-shaped, and the intra-articular part of the L-shape can be designed to be models of different lengths. Before the operation, the appropriate model is selected for surgical operation according to the gender, height and anterior-posterior diameter of the knee joint. The extra-articular part of the L-shaped design can be turned in any direction as needed, avoiding interference with arthroscopic instruments during the operation and facilitating the smooth progress of the operation.

[0061] The soft balloon 2 is designed with soft material that can withstand high pressure. It is in surface contact with the joint surface inside the joint, exerts uniform pressure on the joint, and performs surgical operations within the safe stress range of the articular cartilage, meniscus and ligaments, making the design safer.

[0062] The design of the anti-retraction unit can ensure the stability of the balloon pressure and prevent the backflow of the perfusion fluid. The pressure gauge 12 can accurately control the balloon support force, disperse the stress of the support part, and can accurately control the operation within the safe stress range of the articular cartilage, meniscus and ligaments, realizing the real minimally invasive.

[0063] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0064] The above is a detailed introduction to the knee intercompartmental pressure-adjustable balloon expander provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, the present invention can also be improved and modified without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A pressure-adjustable balloon expander for a knee joint, characterized in that: It comprises a minimally invasive puncture balloon unit and an adjustable pressure-type syringe unit connected to and used to inject fluid into the minimally invasive puncture balloon unit, wherein the adjustable pressure-type syringe unit is connected to the minimally invasive puncture balloon unit via an extension tube (9); The minimally invasive puncture balloon unit comprises a puncture main shaft tube (1) for puncturing into the knee joint, a through hole is provided on the side wall of the end of the puncture main shaft tube (1), and the periphery of the through hole is covered with a soft balloon (2) for expanding under the action of injected fluid to open the knee joint compartment; The adjustable pressure-controlled syringe unit comprises a syringe (10), a booster screw (11) disposed in the syringe (10), a booster mechanism for pushing the booster screw (11) to move toward the inside of the syringe (10), and an anti-retraction mechanism for preventing the booster screw (11) from retreating from the syringe (10); The boosting screw (11) is provided with a rack (25) extending along its length direction, and the boosting mechanism comprises a fixed handle (21) connected to one side of the injection cylinder (10), a movable handle (22) rotatably connected to the fixed handle (21), and a wrench (24) provided at one end away from the movable handle (22), connected to the movable handle (22) and used to engage with the rack (25) to push the boosting screw (11) to feed; The puncture main shaft tube (1) is an L-shaped puncture tube, and the soft balloon (2) is arranged on the shorter side of the L-shaped puncture tube.

2. The pressure-adjustable balloon expander for the knee joint according to claim 1, characterized in that: The anti-retraction mechanism comprises an inner sleeve column (16) for being nested in the injection barrel (10), and an outer sleeve column (17) fixedly connected to the inner sleeve column (16) and for being locked outside the injection barrel (10); The inner sleeve column (16) and the outer sleeve column (17) are provided with sleeve column holes for the booster screw (11) to pass through, the outer sleeve column (17) is provided with a slide groove extending along its radial direction, a stopper button (18) and an elastic member (19) connected to the stopper button (18) are provided in the slide groove, and the stopper button (18) is provided with a stopper hole; When the block button (18) is pressed, the block hole overlaps with the sleeve hole to allow the booster screw (11) to be fed, and when the elastic member (19) pushes the block button (18), the block hole is misaligned with the sleeve hole to form a locking mechanism for the booster screw (11).

3. The pressure-adjustable balloon expander for the knee joint according to claim 2, characterized in that: A pressure control mechanism is connected to the side wall of the injection cylinder (10), and the pressure control mechanism is a pressure gauge (12) connected to the injection cylinder (10).

4. The pressure-adjustable balloon expander for the knee joint according to claim 3, characterized in that: The side wall of the injection cylinder (10) is provided with an exhaust hole (13), and the exhaust hole (13) is provided with a one-way valve (7) and a valve cover (8) that cooperates with the one-way valve (7) to seal the exhaust hole (13).

5. The pressure-adjustable balloon expander for the knee joint according to any one of claims 2 to 4, characterized in that: The boosting mechanism further comprises a fixing tube (20) which is arranged on the periphery of the boosting screw (11) and connected to the anti-backward mechanism; One side of the fixing tube (20) is provided with an opening for the wrench (24) to pass through and overlap the rack (25); the other side of the fixing tube (20) is provided with a square positioning tooth (29), and also includes a fine-tuning switch that cooperates with the square positioning tooth (29); An adjusting tube (31) is sleeved around the circumference of the boosting screw (11), and the adjusting tube (31) is arranged in the fixing tube (20). The fine-tuning switch comprises an anti-slip push button (27) at a first end and a concave clamping portion (28) at a second end. The middle part of the fine-tuning switch is rotatably connected to the adjusting tube (31). When the anti-slip push button (27) is pressed, the concave clamping portion (28) cooperates with the square positioning teeth (29) to drag the adjusting tube (31) relative to the boosting screw (11) to cover the number of teeth of the rack (25) exposed from the opening.

6. The pressure-adjustable balloon expander for the knee joint according to claim 5, characterized in that: The adjustable pressure-type syringe unit and the extension tube (9) are connected via a tee (5), and a third interface of the tee (5) is provided with a one-way valve (6) and a sealing mechanism.

7. The pressure-adjustable balloon expander for the knee joint according to claim 5, characterized in that: A fixing knob (26) is provided at the end of the boosting screw rod (11).

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