Flexible knee joint distraction device with adjustable pressure

Abstract

The invention provides a flexible pressure-adjustable knee joint distraction device, and belongs to the technical field of knee joint adjuvant therapy. Comprising a handle, an inner cavity is formed in the handle, a flexible distraction mechanism is fixedly installed at one end of the handle, and a rigid distraction mechanism is fixedly installed on the other side of the handle. The flexible distraction mechanism gently and stably distraction the knee joint by means of the flexible water supply assembly and depending on water pressure, can fit the shape of the bone and can accurately regulate and control pressure, the rigid distraction mechanism is started when the flexible mechanism fails, reliable rigid distraction is achieved through an ingenious clamping structure and a transmission assembly, the pressure is accurately fed back through matching with a tension sensor, and the flexible distraction mechanism is suitable for the flexible mechanism. The two parts supplement each other, so that the device can flexibly meet the requirements of different patients, operation stages and complex distraction, a comprehensive and reliable distraction scheme is provided for operations such as knee joint replacement, and the safety and success rate of the operations are effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of knee joint assisted treatment, and more specifically, to a knee joint spreading device with flexible and adjustable pressure. Background Art

[0002] Currently, in total knee arthroplasty, accurately determining the final position of the prosthesis is crucial. Among them, spreading the tibial and femoral gaps of the knee joint and determining the osteotomy positions of the tibia and femur according to the deformation size of the gap under the action of an appropriate spreading force are key links in the operation. However, a major problem currently faced is that there is no clear and accurate quantitative standard for this "appropriate spreading force", which completely depends on the personal experience of the surgeon, and there is a lack of an effective knee joint spreading device that can accurately measure the spreading force.

[0003] Existing spreading devices have obvious deficiencies. One type, although having the spreading function, cannot know the magnitude of the force applied during the spreading process, which makes it difficult for doctors to accurately control the spreading force and affects the accuracy of the surgical effect. Another type is in the form of a pressure pad, which can measure the pressure it bears, but is limited to use after osteotomy and is powerless to judge the situation of the gap before osteotomy, and cannot provide sufficient basis for determining the osteotomy position. At the same time, existing technologies mostly use a clamp-type rigid spreading method to assist in knee joint spreading. When moving the knee joint after spreading, due to the lack of the ability of the rigid spreading structure to adapt to deformation, it is easy for the spreader to slip, and there are also inconvenient and unstable problems in the use of the pressure adjustment device. It can be seen that existing spreading devices cannot combine the functions of flexible spreading and rigid spreading, and there are certain defects and deficiencies in overall use. Therefore, it is necessary to improve and design them. Summary of the Invention

[0004] Aiming at the problems in the existing technology that it is impossible to combine rigid spreading, flexible spreading, and flexibly control the spreading pressure, the purpose of the present invention is to provide a knee joint spreading device with flexible and adjustable pressure.

[0005] To solve the above problems, the present invention adopts the following technical solutions:

[0006] A knee joint spreading device with flexible and adjustable pressure, including a handle. An inner cavity is opened inside the handle. One end of the handle is fixedly installed with a flexible spreading mechanism, and the other end of the handle is fixedly installed with a rigid spreading mechanism. A linkage mechanism is arranged inside the inner cavity, and both sides of the linkage mechanism are linked with the rigid spreading mechanism and the flexible spreading mechanism respectively. A handle groove is opened on the back of the handle, and a controller is installed inside the handle groove. One side of the back of the controller is provided with a touch screen, and the other side of the back of the controller is provided with control buttons;

[0007] The linkage mechanism includes a driving component, a flexible water supply component, and a rigid linkage component. The driving component is fixedly installed in the middle of the top of the handle. The flexible water supply component is arranged on one side of the inner cavity close to the flexible expansion mechanism. The rigid linkage component is arranged on one side of the inner cavity close to the rigid expansion mechanism. The output end of the flexible water supply component is communicated with the flexible expansion mechanism. The rigid linkage component is linked with the rigid expansion mechanism. The driving component is in transmission connection with the rigid linkage component.

[0008] Optionally, the driving component includes an installation groove which is opened in the middle of the top of the handle. A frame is fixedly installed inside the installation groove. A first gear is rotatably connected between the inner sides of the frame. A driving motor is fixedly installed on the side of the frame. The output end of the driving motor is connected to the first gear. The first gear is in transmission connection with the rigid linkage component. An outer protective shell is fixedly installed inside the frame and covers the outside of the first gear. The first gear is rotatably installed inside the outer protective shell.

[0009] Optionally, the rigid linkage component includes a first chute. The top of the first chute is communicated with the inside of the installation groove. The first chute is opened at the top inside the inner cavity. A sliding frame is slidably connected inside the first chute. A first rack is fixedly connected to the inner side of the sliding frame. The top of the first rack is meshed with the first gear. An extrusion frame is fixedly installed at the bottom of the sliding frame. One side of the extrusion frame close to the flexible water supply component is arranged in a right triangle with the inclined surface at the bottom.

[0010] Optionally, the flexible water supply component includes a water supply elastic water bag which is fixedly installed at one end of the inner cavity away from the extrusion frame. A connecting pipe is fixedly installed on the side of the water supply elastic water bag away from the rigid expansion mechanism. The input end of the connecting pipe is communicated with the water supply elastic water bag. The output end of the connecting pipe is communicated with the flexible expansion mechanism.

[0011] Optionally, the flexible expansion mechanism includes a connecting frame which is fixedly installed at one end of the handle away from the rigid expansion mechanism. A receiving plate is fixedly installed at the outer end of the connecting frame. Expansion elastic water bags are fixedly installed at the top and bottom of the receiving plate. The input ends of the expansion elastic water bags are communicated with the output end of the connecting pipe. A water pressure sensor is fixedly installed on the back of the connecting frame. The detection end of the water pressure sensor is arranged inside the connecting pipe.

[0012] Optionally, the rigid expansion mechanism includes a mounting frame fixedly installed on the side of the handle away from the flexible expansion mechanism. The outer end of the mounting frame is fixedly installed with the expansion assembly. The side of the expansion assembly close to the handle is fixedly installed with a docking assembly. The docking assembly is arranged inside the mounting frame, and the outer end of the docking assembly is connected to the tension sensor.

[0013] Optionally, the expansion assembly includes a rail frame fixedly installed on the outside of the mounting frame. A lead screw is rotatably connected inside the rail frame. The thread directions at both ends of the lead screw are opposite. Both ends of the lead screw are threadedly connected with movable blocks. The movable blocks are slidably connected inside the rail frame. The side of the movable block away from the handle is fixedly connected with an expansion forceps arm. The outer end of the expansion forceps arm is fixedly connected with an anti-slip forceps plate. A transmission assembly is arranged in the middle of the rail frame. The end of the transmission assembly close to the handle is connected to the docking assembly. The transmission assembly includes a sliding frame and a second gear. The sliding frame is slidably connected to the middle of the mounting frame. A second rack is fixedly connected to one side inside the sliding frame. The second gear is fixedly connected to the middle of the lead screw. The second rack and the second gear are meshed and connected. The side of the sliding frame close to the handle is connected to the docking assembly.

[0014] Optionally, the docking assembly includes a side rail and a docking block. The side rail is fixedly installed at one end of the frame close to the handle. Telescopic springs are fixedly installed at both ends inside the side rail. The docking block is fixedly connected to the end of the tension sensor close to the rail frame. Card slots are formed on both sides of the docking block. The outer ends of the telescopic springs are fixedly connected with sliding blocks. The side of the sliding block close to the tension sensor is fixedly connected with a clamping block. The clamping block is inserted into the inside of the card slot. The overall top view shape of the inside of the card slot is in the shape of a right trapezoid. The outer end top view shape of the clamping block is also in the shape of an isosceles trapezoid. The inclined surface of the clamping block is arranged on the side close to the docking block. The top of the sliding block is fixedly connected with a push plate.

[0015] Optionally, one end of the extrusion frame away from the flexible expansion mechanism is provided with a movable frame and a tension sensor. The end of the tension sensor penetrates through the extrusion frame and is linked with the rigid expansion mechanism. A cavity is formed inside the movable frame, and a switching component is arranged inside the cavity. The switching component includes an electric telescopic rod arranged inside the cavity. The output end of the electric telescopic rod is fixedly connected with an adjusting rod. One end of the adjusting rod penetrates through the movable frame and is fixedly connected with the tension sensor. First wedge-shaped blocks are fixedly connected to both the upper and lower sides of the adjusting rod. A sliding rod is arranged inside the cavity. The two ends of the sliding rod penetrate through and are slidably connected with second wedge-shaped blocks. Each second wedge-shaped block is respectively arranged in a matching manner with the corresponding first wedge-shaped block. Extrusion springs are sleeved on the outer sides of both ends of the sliding rod. One end of each of the two extrusion springs is fixedly connected with the corresponding second wedge-shaped block. A dislocation component is arranged on one side of each of the two second wedge-shaped blocks. Two third chutes are formed on one side of the movable frame close to the extrusion frame.

[0016] Optionally, the dislocation component includes an L-shaped block, a moving plate and a first movable column arranged inside the cavity. One end of the first movable column is fixedly connected with the second wedge-shaped block. The other end of the first movable column penetrates through the L-shaped block and is fixedly connected with a second movable column on one side. An adjusting groove is formed on the moving plate. The adjusting groove is arranged in a matching manner with the second movable column. Third movable columns are fixedly connected to the bottoms of both ends of the moving plate. One end of each of the third movable columns penetrates through and is slidably connected with a limiting block. The limiting block is fixedly installed inside the cavity of the movable column. A connecting rod is fixedly connected to one side of the moving plate away from the L-shaped block of the movable column. The connecting rod penetrates and extends to one end of the third chute of the movable column and is fixedly connected with a first slider of the movable column. The first slider is fixedly connected with the extrusion frame of the movable column. Compared with the prior art, the technical solution provided by the present invention has at least the following beneficial effects:

[0017] In the above solution, through the cooperation of the flexible water supply component and the flexible expansion mechanism, during actual use, the driving motor can be started to drive the first gear to rotate. By means of the meshing transmission of the gear and the rack, the sliding frame can be driven to slide smoothly in the first chute. The extrusion frame at the bottom of the sliding frame effectively extrudes the water supply elastic water sac through a special inclined plane structure, so that the water liquid flows into the expansion elastic water sac through the connecting pipe. As the expansion elastic water sac gradually expands, its surface area increases, and it can gently and effectively expand and support the knee joint. The operation is simple. Just place the unexpanded bearing plate at the knee joint and start the motor to achieve expansion. The flexibility of the expansion elastic water sac enables it to automatically deform according to the shape of the knee joint bones, enhancing the expansion stability and preventing the device from falling off. At the same time, the water pressure sensor monitors the pressure in real time, and the doctor can flexibly adjust the expansion pressure accordingly, improving the convenience and accuracy of the operation.

[0018] A rigid expansion mechanism is adopted, so that when rigid and rapid expansion is required during use, it can be quickly switched to the rigid expansion mode. When activated, the tension sensor can be pulled toward the card block, and the card block is squeezed to cause the sliding block to slide and squeeze the telescopic spring. After the docking block is in place, the telescopic spring resets and pushes the card block into the card slot, firmly connecting the slide frame and the tension sensor. After starting the drive motor, the slide drives the tension sensor and the slide frame to move, and the slide frame drives the second gear, which drives the screw to rotate, and the anti-slip clamp plate at the end of the expansion clamp arm is placed at the knee joint. Through the gear rack transmission, the screw drives the movable block, which drives the expansion clamp arm to expand the knee joint.

[0019] This device is equipped with two expansion functions, flexible and rigid, which can further improve the adaptability of the device. The flexible expansion mechanism relies on the flexible water supply component to use water pressure to achieve gentle, stable and bone-fitting expansion, and can precisely control the pressure. The rigid expansion mechanism plays a role when the flexible mechanism cannot work. Through the clever clamping structure and transmission components, reliable and stable rigid expansion is achieved, and the expansion pressure can be accurately fed back through the tension sensor, which is convenient for the doctor to precisely control. The two modes work together to enable the device to flexibly respond to different patients, different surgical stages and various complex expansion needs, providing a more comprehensive and reliable expansion solution for related medical operations such as total knee replacement surgery, which greatly improves the safety and success rate of the operation.

[0020] By cooperating with the switching component and the error component, the extrusion frame and the water supply elastic water bag can be misaligned when the rigid expansion mechanism is used, preventing the flexible expansion mechanism from being activated when the rigid expansion mechanism is working, so that the rigid expansion mechanism and the flexible expansion mechanism do not interfere with each other during flexible switching. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, further serve to explain the principles of the invention and to enable one skilled in the art to make and use the invention.

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0023] Figure 2 It is a rear view structural schematic diagram of the present invention;

[0024] Figure 3 This is a schematic structural diagram of one end of the flexible expansion mechanism of the present invention;

[0025] Figure 4 This is a schematic structural diagram of one end of the present invention close to the rigid expansion mechanism;

[0026] Figure 5 It is a schematic diagram of the top view of the structure of the present invention;

[0027] Figure 6 Schematic diagram of the internal structure of the present invention;

[0028] Figure 7 For the present invention Figure 4 A schematic diagram of the enlarged structure at point A;

[0029] Figure 8 For the present invention Figure 5 A schematic diagram of the enlarged structure at point B;

[0030] Figure 9 For the present invention Figure 6 Schematic diagram of the enlarged structure at C;

[0031] Figure 10 For the present invention Figure 6 A schematic diagram of the structure at D of FIG.

[0032] Figure 11 Schematic diagram of the internal structure of the movable frame of the present invention;

[0033] Figure 12 It is a structural schematic diagram of the dislocation component of the present invention.

[0034] [Reference Signs]

[0035] 1. Handle;

[0036] 2. Rigid expansion mechanism; 21. Mounting frame;

[0037] 22. Spreading assembly; 221. Rail frame; 222. Screw rod; 223. Movable block; 224. Spreading clamp arm; 225. Anti-slip clamp plate;

[0038] 23. Docking assembly; 231. Side rail; 232. Docking block; 233. Telescopic spring; 234. Slot; 235. Sliding block; 236. Block; 237. Push plate;

[0039] 3. Flexible expansion mechanism; 31. Connecting frame; 32. Adapter plate; 33. Expandable elastic water bag; 34. Water pressure sensor;

[0040] 4. Inner cavity;

[0041] 5. Linkage mechanism;

[0042] 51. Drive assembly; 511. Mounting slot; 512. Frame; 513. First gear; 514. Drive motor; 515. Outer protective shell;

[0043] 52. Flexible water supply assembly; 521. Water supply elastic water bag; 522. Connecting pipe;

[0044] 53. Rigid linkage assembly; 531. First chute; 532. Slide carriage; 533. First rack; 534. Movable frame; 535. Extrusion frame; 536. First slider; 537. Second chute; 538. Second slider;

[0045] 54. Switching assembly; 541. Tensile sensor; 542. Electric telescopic rod; 543. Adjusting rod; 544. First wedge block; 545. Extrusion spring; 546. Second wedge block; 547. Third chute;

[0046] 55. Dislocation assembly; 551. L-shaped block; 552. First movable column; 553. Second movable column; 554. Moving plate; 555. Adjusting groove; 556. Limiting block; 557. Third movable column; 558. Connecting rod;

[0047] 6. Transmission assembly; 61. Slide frame; 62. Second rack; 63. Second gear;

[0048] 7. Handle groove; 8. Controller; 9. Touch screen; 10. Control button.

[0049] As shown in the figure, in order to clearly show the structure of the embodiments of the present invention, specific structures and devices are marked in the figure. However, this is only for illustrative purposes and is not intended to limit the present invention to this specific structure, device and environment. Those of ordinary skill in the art can adjust or modify these devices and environments according to specific needs. Detailed implementation manners

[0050] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments. For some well-known technologies, those skilled in the art can also adopt other alternative methods for implementation; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0051] It should be noted that in the specification, references to "an embodiment", "embodiments", "exemplary embodiments", "some embodiments", etc. indicate that the described embodiments may include specific features, structures or characteristics, but not every embodiment necessarily includes such specific features, structures or characteristics. Additionally, when combining embodiments to describe specific features, structures or characteristics, implementing such features, structures or characteristics in combination with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the relevant art.

[0052] Generally, terms can be understood, at least in part, from their use in context. For example, depending at least in part on the context, the term "one or more" as used herein can refer to any feature, structure, or property in a singular sense, or can refer to a combination of features, structures, or properties in a plural sense. Additionally, the term "based on" can be understood to not necessarily be intended to convey a set of exclusive factors, but instead, depending at least in part on the context, can allow for the presence of other factors that are not necessarily explicitly described.

[0053] It will be understood that the meanings of "on", "above", and "over" in the present invention should be construed in the broadest manner such that "on" not only means "directly on" something, but also includes the meaning of being "on" something with intervening features or layers therebetween, and "above" or "over" not only means "above" or "over" something, but can also include the meaning of being "above" or "over" something with no intervening features or layers therebetween.

[0054] Furthermore, spatial relative terms such as "under", "below", "lower", "above", "upper", etc. may be used herein for convenience in describing the relationship of one element or feature to another or other elements or features, as shown in the figures. The spatial relative terms are intended to cover different orientations in the use or operation of the device in addition to the orientation depicted in the figures. The device may be otherwise oriented, and the spatial relative descriptors used herein may be interpreted accordingly.

[0055] As Figures 1 to 12As shown in the figure, an embodiment of the present invention provides a flexible and adjustable pressure knee joint spreading device, which includes a handle 1. An inner cavity 4 is formed inside the handle 1. One end of the handle 1 is fixedly installed with a flexible spreading mechanism 3, and the other end of the handle 1 is fixedly installed with a rigid spreading mechanism 2. A linkage mechanism 5 is arranged inside the inner cavity 4. Both sides of the linkage mechanism 5 are linked with the rigid spreading mechanism 2 and the flexible spreading mechanism 3 respectively. A handle groove 7 is formed on the back of the handle 1, and a controller 8 is installed inside the handle groove 7. One side of the back of the controller 8 is provided with a touch screen 9, and the other side of the back of the controller 8 is provided with control buttons 10. The linkage mechanism 5 includes a driving component 51, a flexible water supply component 52 and a rigid linkage component 53. The driving component 51 is fixedly installed in the middle of the top of the handle 1. The flexible water supply component 52 is arranged on one side of the inner cavity 4 close to the flexible spreading mechanism 3. The rigid linkage component 53 is arranged on one side of the inner cavity 4 close to the rigid spreading mechanism 2. The output end of the flexible water supply component 52 is communicated with the flexible spreading mechanism 3. The rigid linkage component 53 is linked with the rigid spreading mechanism 2. The driving component 51 is in transmission connection with the rigid linkage component 53. In this device, the flexible spreading mechanism 3 drives the gear-rack transmission by means of a driving motor 514, squeezes the water supply elastic water bag 521 to inject water into the spreading elastic water bag 33 to achieve spreading. The spreading elastic water bag 33 has good flexibility, can deform according to the shape of the bone, enhances the spreading stability, avoids falling off, and the water pressure sensor 34 can monitor the pressure in real time and flexibly adjust it through the driving motor 514. The rigid spreading mechanism 2 is convenient to switch. By restarting the driving motor 514 again, spreading is achieved by using the gear-rack and the lead screw 222 transmission. The tension sensor 541 detects the tension in real time. The doctor can accurately control the spreading pressure by controlling the driving motor 514. The cooperation of the two mechanisms greatly improves the operation stability, convenience, accuracy and adaptability of the device.

[0056] As Figures 1 to 7 and Figure 9 As shown in the figure, the driving component 51 includes an installation groove 511. The installation groove 511 is formed in the middle of the top of the handle 1. A frame 512 is fixedly installed inside the installation groove 511. A first gear 513 is rotatably installed between the inner sides of the frame 512. A driving motor 514 is fixedly installed on one side of the frame 512. The output end of the driving motor 514 is connected with the first gear 513. The first gear 513 is in transmission connection with the rigid linkage component 53. An outer protective shell 515 is fixedly installed inside the frame 512. The outer protective shell 515 covers the outside of the first gear 513. The first gear 513 is rotatably connected inside the outer protective shell 515. In this knee joint spreading device, the frame 512 is located inside the installation groove 511. The first gear 513 is rotatably connected to the inner side of the frame 512. The driving motor 514 installed on one side of the frame 512 has its output end firmly connected to the first gear 513.

[0057] When the doctor issues an instruction through the controller 8 in the handle slot 7 on the back of the handle 1, the drive motor 514 responds quickly and starts to operate. The torque generated by the operation of the drive motor 514 is directly transmitted to the first gear 513, driving the first gear 513 to rotate inside the frame 512. Since the first gear 513 is in transmission connection with the rigid linkage assembly 53, the rotating first gear 513 can transmit power to the rigid linkage assembly 53, thereby driving the rigid expansion mechanism 2 to work. To ensure the stable operation of the first gear 513, an outer protective shell 515 is also fixedly installed on the inside of the frame 512. The outer protective shell 515 tightly covers the outside of the first gear 513. The first gear 513 rotates inside the outer protective shell 515. The outer protective shell 515 not only protects the first gear 513 from interference from the external environment, but also prevents debris from entering during surgery and affecting the operation of the gears, ensuring that the drive assembly 51 can continuously and stably provide power support for the expansion operation of the device.

[0058] like Figures 1 to 6 and Figures 8 to 10 As shown, the rigid linkage component 53 includes a first slide groove 531, the top of the first slide groove 531 is connected to the interior of the mounting groove 511, the first slide groove 531 is opened at the top of the inner cavity 4, the interior of the first slide groove 531 is slidably connected to a slide 532, the slide 532 is fixedly connected to a first rack 533, the first rack 533 and the first gear 513 are meshed and connected, and an extrusion frame 535 is fixedly installed at the bottom of the slide 532, and the extrusion frame 535 is arranged in a right triangle on the side close to the flexible water supply component 52 and the inclined surface is arranged at the bottom (as shown in FIG. Figure 9 As shown), the tension sensor 541 (as Figure 8 The end portion of the extrusion frame 535 is linked to the rigid expansion mechanism 2.

[0059] like Figure 2 and Figure 6 As shown, the flexible water supply component 52 includes a water supply elastic water bag 521, and the water supply elastic water bag 521 is installed in the inner cavity 4. A connecting pipe 522 is fixedly installed on the side of the water supply elastic water bag 521 away from the rigid expansion mechanism 2. The output end of the connecting pipe 522 is connected to the flexible expansion mechanism 3, and the input end of the connecting pipe 522 is connected to the water supply elastic water bag 5213. The flexible expansion mechanism 3 includes a connecting frame 31, and the connecting frame 31 is fixedly installed on the end of the handle 1 away from the rigid expansion mechanism 2. A receiving plate 32 is fixedly installed on the outer end of the connecting frame 31, and the top and bottom of the receiving plate 32 are fixedly installed with expansion elastic water bags 33. The input end of the expansion elastic water bag 33 is connected to the output end of the connecting pipe 522. A water pressure sensor 34 is fixedly installed on the back of the connecting frame 31. The water pressure sensor 34 (such asFigure 2 The detection end (as shown) is arranged inside the connecting pipe 522. When the driving motor 514 starts and drives the first gear 513 to rotate, the rigid linkage assembly 53 starts to operate. The first gear 513 meshes with the first rack 533 fixed to the inner side of the carriage 532, causing the carriage 532 to slide within the first chute 531. The extrusion frame 535 at the bottom of the carriage 532 moves accordingly. Its right triangle structure close to the flexible water supply assembly 52 can efficiently extrude the water supply elastic water bag 521 through the bottom inclined plane to prompt the flexible water supply assembly 52 to work. When the flexible water supply assembly 52 works, the extruded water supply elastic water bag 521 transports the water liquid to the flexible expansion mechanism 3 through the connecting pipe 522.

[0060] Specifically, the connecting frame 31 is fixed to one end of the handle 1. The top and bottom of the receiving plate 32 at its outer end are provided with the expansion elastic water bags 33, which receive the water liquid from the water supply elastic water bag 521 through the connecting pipe 522, and then expand to open the knee joint. The detection end of the water pressure sensor 34 on the back of the connecting frame 31 is placed inside the connecting pipe 522 to monitor the water liquid pressure in real time and feedback information to precisely control the flexible expansion force. The entire system works together to achieve the effective opening operation of the knee joint.

[0061] As Figures 1 to 6 and Figure 10 shown, the rigid expansion mechanism 2 includes a mounting frame 21. The mounting frame 21 is fixedly installed on the side of the handle 1 away from the flexible expansion mechanism 3. The outer end of the mounting frame 21 is fixedly installed with an expansion assembly 22. A docking assembly 23 is fixedly installed on the side of the expansion assembly 22 close to the handle 1. The docking assembly 23 is arranged inside the mounting frame 21, and the outer ends of the docking assembly 23 and the tension sensor 541 are connected. As Figure 4 and Figure 10 shown, the expansion assembly 22 includes a rail frame 221. The rail frame 221 is fixedly installed on the outside of the mounting frame 21. A lead screw 222 is rotatably installed inside the rail frame 221. The thread directions of the two ends of the lead screw 222 are opposite. Both ends of the lead screw 222 are threadedly connected with movable blocks 223. The movable blocks 223 are slidably installed inside the rail frame 221. One side of the movable block 223 away from the handle 1 is fixedly connected with an expansion pliers arm 224. The outer end of the expansion pliers arm 224 is fixedly connected with an anti-slip pliers plate 225. A transmission assembly 6 is arranged in the middle of the rail frame 221. One end of the transmission assembly 6 close to the handle 1 is connected with the docking assembly 23.

[0062] As Figure 10As shown, the transmission assembly 6 includes a slide frame 61 and a second gear 63. The slide frame 61 is slidably connected to the middle part of the mounting frame 21. A second rack 62 is fixedly connected to the inner side of the slide frame 61. The second gear 63 is fixedly connected to the middle part of the screw rod 222. The second rack 62 and the second gear 63 are meshed and connected. The side of the slide frame 61 close to the handle 1 is connected to the docking assembly 23. Figure 8 As shown, the docking assembly 23 includes a side rail 231 and a docking block 232. The side rail 231 is fixedly installed on the end of the frame 512 close to the handle 1. The two ends of the inner side rail 231 are connected to one end of the telescopic spring 233. The docking block 232 is fixedly connected to the end of the tension sensor 541 close to the rail frame 221. A slot 234 is provided on both sides of the docking block 232. The other end of the telescopic spring 233 is fixedly connected to a sliding block 235. The sliding block 235 is fixedly connected to a block 236 on the side close to the tension sensor 541. The block 236 is inserted into the interior of the slot 234. The overall shape of the interior of the slot 234 is a right-angled trapezoid when viewed from above. The outer end of the block 236 is also an isosceles trapezoid when viewed from above. The inclined surface of the block 236 is set on the side close to the docking block 232. The top of the sliding block 235 is fixedly connected to a push plate 237.

[0063] When the rigid expansion mechanism 2 needs to be activated, as the tension sensor 541 moves, the docking block 232 approaches the clamping block 236. The outer end of the clamping block 236 is an isosceles trapezoid and the inclined surface is close to the docking block 232. When the docking block 232 contacts the inclined surface of the clamping block 236, under the oblique force, the docking block 232 expands the clamping block 236 and moves it to both sides. The clamping block 236 pushes the sliding block 235 to compress the telescopic spring 233 in the side rail 231, so that the clamping block 236 has a certain retraction and tightening force. When the docking block 232 continues to move forward, it moves to The front end of the card block 236 is accurately inserted into the card slot 234 to achieve a stable connection between the docking block 232 and the card block 236, and then the tension sensor 541 is connected to the docking assembly 23; when the rigid support mechanism 2 is not in use, the push plate 237 is pushed to both sides by hand to disengage the card block 236 from the card slot 234, and the tension sensor 541 is moved backward until the card block 236 disengages from the card slot 234 on the docking block 232. At this time, the telescopic spring 233 is reset, driving the card block 236 to reset, so that the card block 236 and the docking block 232 are completely separated.

[0064] When the driving motor 514 drives the first gear 513 to rotate, the first rack 533 meshing with the first gear 513 drives the carriage 532 to slide in the first chute 531. The bottom of the carriage 532 presses against the frame 535 to push the movable frame 534, causing the connected tension sensor 541 to move. Since the tension sensor 541 is already connected to the docking assembly 23, the tension sensor 541 drives the docking block 232 to move. The docking block 232 pulls the sliding frame 61 to slide in the middle of the mounting frame 21. The second rack 62 on one side inside the sliding frame 61 meshes with the second gear 63 fixed in the middle of the lead screw 222. The sliding of the sliding frame 61 drives the second gear 63 to rotate, thereby driving the lead screw 222 to rotate in the rail frame 221. Since the thread pitches at both ends of the lead screw 222 are opposite, when the lead screw 222 rotates, the movable blocks 223 connected by the threads at both ends slide in opposite directions in the rail frame 221, driving the fixed spreading forceps arms 224 to move. The anti-slip forceps plates 225 at the outer ends of the spreading forceps arms 224 gradually open outwards, realizing the rigid spreading operation of the knee joint. Through the precise mechanical transmission between components, the rigid spreading function is realized stably and effectively. Moreover, the design of the tension sensor 541 can detect the tension in real time, facilitating the doctor to better control the force.

[0065] Such as Figure 6 , Figure 9 , Figure 11 and Figure 12As shown, at one end of the extrusion frame 535 away from the flexible expansion mechanism, there is a movable frame 534 and a tension sensor 541. A cavity is formed inside the movable frame 534, and a switching component 54 is arranged in the cavity. The switching component 54 includes an electric telescopic rod 542 arranged in the cavity. The output end of the electric telescopic rod 542 is fixedly connected with an adjusting rod 543. One end of the adjusting rod 543 penetrates through the movable frame 534 and is fixedly connected with the tension sensor 541. First wedge-shaped blocks 544 are fixedly connected to both the upper and lower sides of the adjusting rod 543. A sliding rod is arranged in the cavity. Second wedge-shaped blocks 546 are respectively arranged at both ends of the sliding rod in a penetrating and sliding manner. Each second wedge-shaped block 546 is arranged in cooperation with the corresponding first wedge-shaped block 544. Compression springs 545 are sleeved on the outer sides of both ends of the sliding rod. The ends of both compression springs 545 are fixedly connected with the corresponding second wedge-shaped blocks 546. A dislocation component 55 is arranged on one side of each of the two second wedge-shaped blocks 546. Two third chutes 547 are formed on the side of the movable frame 534 close to the extrusion frame 535. The dislocation component 55 includes an L-shaped block 551, a moving plate 554, and a first movable column 552 arranged in the cavity. One end of the first movable column 552 is fixedly connected with the second wedge-shaped block 546. The other end of the first movable column 552 penetrates through the L-shaped block 551 and is fixedly connected with a second movable column 553 on one side. An adjusting groove 555 is formed on the moving plate 554. The adjusting groove 555 is arranged in cooperation with the second movable column 553. Third movable columns 557 are fixedly connected to the bottoms of both ends of the moving plate 554. One end of each third movable column penetrates through and is slidably installed on a limit block 556. The limit block 556 is fixedly installed in the cavity. A connecting rod 558 is fixedly connected to the side of the moving plate 554 away from the L-shaped block 551. The connecting rod 558 penetrates and extends to one end of the third chute 547 and is fixedly connected with a first slider 536. The first slider 536 is fixedly connected with the extrusion frame 535. Specifically, a second chute 537 is arranged on the extrusion frame 535. A second slider 538 is arranged at the bottom of the sliding frame 532. The second chute 537 and the second slider 538 are used in cooperation. Each of the two extrusion frames 535 is connected with a first slider 536.

[0066] When it is necessary to quickly switch to the rigid expansion mechanism 2, specifically, the electric telescopic rod 542 drives the tension sensor to move through the adjusting rod 543 until the docking block 232 continues to move forward until the front end of the card block 236 is accurately inserted into the card slot 234, thereby realizing a stable connection between the docking block 232 and the card block 236. During the movement of the adjusting rod 543, the first wedge block 544 is simultaneously driven to move and squeeze the second wedge block 546 to move along the slide rod. When the second wedge block 546 moves, it will drive the first movable column 552 to slide along the L-shaped block 551 and drive the second movable column 553 to move on the adjusting slot 555 on the movable plate 554. Since the adjusting slot 555 is curved, The linear arrangement allows the second movable column 553 to drive the movable plate 554 through the adjustment slot 555 to move horizontally on the limit block 556 through the third movable column 557. The horizontal movement of the movable plate 554 drives the connecting rod 558 and then drives the extrusion frame 535 to move through the cooperation of the first slider 536 and the third slide slot 547, so that the two extrusion frames 535 are separated or closed. When the two extrusion frames 535 are separated, the extrusion frames 535 and the water supply elastic water bag 521 are misaligned, which can prevent the rigid expansion mechanism 2 from causing the flexible expansion mechanism 3 to be activated when working, thereby ensuring that the rigid expansion mechanism 2 and the flexible expansion mechanism 3 do not interfere with each other during flexible switching.

[0067] The workflow of the technical solution provided by the present invention is as follows:

[0068] The present device can effectively improve the stability and convenience of the knee joint expansion operation by setting a flexible water supply component 52 and cooperating with the flexible expansion mechanism 3. In actual use, the driving motor 514 is started, and the operation of the motor drives the first gear 513 in the first slide groove 531 to rotate. Since the first gear 513 is engaged with the first rack 533, the rotation of the first gear 513 drives the first rack 533, and then drives the slide 532 to slide smoothly in the first slide groove 531. The bottom of the slide 532 is connected to the extrusion frame 535, and the extrusion frame 535 is connected to the extrusion frame 536. The side of 35 close to the water supply elastic water bag 521 is designed as a slope structure. When the slide 532 drives the squeezing frame 535 to move, the slope can effectively squeeze the water supply elastic water bag 521. After the water supply elastic water bag 521 is squeezed, the water stored inside is accurately transported to the expanded elastic water bag 33 at the top and bottom of the receiving plate 32 outside the connecting frame 31 through the connecting tube 522. As the expanded elastic water bag 33 is filled with water, it gradually expands and its surface area increases, thereby gently and effectively expanding the patient's knee joint.

[0069] During the operation, just carefully place the undeployed receiving plate 32 at the knee joint, and then start the driving motor 514. The motor drives the first gear 513 to drive the first rack 533, prompting the carriage 532 to slide in the first chute 531, and then pushing the extrusion frame 535 to press on the water supply elastic water sac 521. The liquid fills and expands the elastic water sac 33 through the connecting pipe, realizing the adaptive expansion of the knee joint. It is worth mentioning that the expanded elastic water sac 33 has good flexibility and can automatically deform according to the shape of the knee joint bones, closely fitting the knee joint during the expansion process, significantly enhancing the stability of the expansion and effectively avoiding the risk of accidental detachment of the device during the expansion process. In addition, during the expansion process, the water pressure sensor 34 monitors the pressure in the expanded elastic water sac 33 in real time, and the doctor can flexibly adjust the expansion pressure according to the monitoring data, enabling this device to accurately meet different expansion requirements and further improving the convenience and accuracy of the operation.

[0070] The device is also equipped with a rigid expansion mechanism 2, which serves as a powerful supplement to the flexible expansion mechanism 3, significantly enhancing the adaptability of the device. When the flexible expansion mechanism 3 fails to work properly due to special circumstances, it can be quickly switched to the rigid expansion mechanism 2. When enabling the rigid expansion mechanism 2, the tension sensor 541 needs to be pulled towards the side of the clamping block 236. The clamping block 236 is isosceles trapezoidal, and its inner inclined surface is close to the docking block 232 of the tension sensor 541. When the docking block 232 touches the inclined surface of the clamping block 236, the clamping block 236 is squeezed. Under the guiding action of the inclined surface, the sliding block 235 is urged to slide and squeeze the telescopic spring 233, causing the telescopic spring 233 to be in a stretched state. As the docking block 232 further moves to the inside of the clamping block 236, when the clamping block 236 contacts the card slot 234, the telescopic spring 233 resets, pushing the clamping block 236 to accurately insert into the card slot 234, realizing the stable connection between the sliding frame 61 and the tension sensor 541. After the docking block 232 is successfully clamped with the clamping block 236, the driving motor 514 is started, and the motor drives the first gear 513 to rotate, driving the sliding frame 532 to slide in the first chute 531. The sliding frame 532 then pulls the tension sensor 541 to move. Since the card slot 234 of the docking block 232 is firmly clamped with the clamping block 236, the movement of the sliding frame 532 drives the tension sensor 541, and then drives the sliding frame 61 to displace towards the side of the flexible expansion mechanism 3. The movement of the sliding frame 61 drives the second gear 63 to rotate. The second gear 63 meshes with the second rack 62, driving the lead screw 222 to rotate in the rail frame 221. During this process, the anti-slip clamp plate 225 at the end of the spreading forceps arm 224 is placed at the knee joint to be spread. As the sliding frame 61 slides, the second gear 63 and the second rack 62 continue to mesh and drive. The lead screw 222 drives the movable block 223 to slide in the rail frame 221. Since the thread directions at both ends of the second lead screw 222 are opposite, the movable block 223 can perform reciprocating displacement synchronously, driving the spreading forceps arm 224 to act, making the anti-slip clamp plate 225 at the end of the spreading forceps arm 224 move outwards, thereby realizing the spreading operation of the knee joint. During the spreading process, the tension sensor 541 detects the tension in real time. This tension value corresponds to the pressure applied by the spreading forceps arm 224. Doctors can flexibly and accurately control the spreading pressure of the spreading forceps arm 224 based on the data feedback by the tension sensor 541, effectively improving the overall operation accuracy of the device and facilitating the precise control of the spreading force. By equipping with two functions of flexible expansion and rigid expansion, the device can flexibly respond to various complex expansion requirements, demonstrating strong adaptability performance.

[0071] The present invention encompasses any alternatives, modifications, equivalent methods, and solutions within the spirit and scope of the present invention. To enable the public to have a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention. However, those skilled in the art can fully understand the present invention even without the description of these details. Additionally, well-known methods, processes, procedures, components, and circuits are not described in detail to avoid unnecessary confusion to the essence of the present invention.

[0072] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as within the protection scope of the present invention.

Claims

1. A knee joint distraction device with flexible adjustable pressure, comprising a handle, characterized in that, The interior of the handle is provided with an inner cavity. One end of the handle is fixedly installed with a flexible expansion mechanism, and the other end of the handle is fixedly installed with a rigid expansion mechanism. A linkage mechanism is arranged inside the inner cavity. The two sides of the linkage mechanism are respectively linked with the rigid expansion mechanism and the flexible expansion mechanism. A handle groove is formed on the back of the handle, and a controller is installed inside the handle groove. One side of the back of the controller is provided with a touch screen, and the other side of the back of the controller is provided with control buttons; The linkage mechanism includes a driving component, a flexible water supply component, and a rigid linkage component. The driving component is fixedly installed in the middle of the top of the handle. The flexible water supply component is arranged on one side of the inner cavity close to the flexible expansion mechanism. The rigid linkage component is arranged on one side of the inner cavity close to the rigid expansion mechanism. The output end of the flexible water supply component is communicated with the flexible expansion mechanism. The rigid linkage component is linked with the rigid expansion mechanism. The driving component is in transmission connection with the rigid linkage component.

2. The knee joint distraction device with flexible adjustable pressure according to claim 1, wherein The driving component includes an installation groove. The installation groove is formed in the middle of the top of the handle. A frame is fixedly installed inside the installation groove. A first gear is rotatably connected between the inner sides of the frame. A driving motor is fixedly installed on the side of the frame. The output end of the driving motor is connected to the first gear. The first gear is in transmission connection with the rigid linkage component. An outer protective shell is fixedly installed inside the frame. The outer protective shell covers the outside of the first gear. The first gear is rotatably installed inside the outer protective shell.

3. The knee joint distractor with flexible adjustable pressure according to claim 2, characterized in that, The rigid linkage component includes a first chute. The top of the first chute is communicated with the inside of the installation groove. The first chute is formed at the top inside the inner cavity. A sliding frame is slidably connected inside the first chute. A first rack is fixedly connected to the inner side of the sliding frame. The top of the first rack is meshed with the first gear. An extrusion frame is fixedly installed at the bottom of the sliding frame. One side of the extrusion frame close to the flexible water supply component is arranged in a right triangle shape with the inclined surface at the bottom.

4. The knee joint distraction device with flexible adjustable pressure according to claim 3, characterized in that, The flexible water supply component includes a water supply elastic water bag. The water supply elastic water bag is fixedly installed at one end of the inner cavity far from the extrusion frame. A communication pipe is fixedly installed on the side of the water supply elastic water bag far from the rigid expansion mechanism. The input end of the communication pipe is communicated with the water supply elastic water bag. The output end of the communication pipe is communicated with the flexible expansion mechanism.

5. The knee joint distraction device with flexible adjustable pressure according to claim 4, characterized in that, The flexible expansion mechanism includes a connecting frame. The connecting frame is fixedly installed at one end of the handle far from the rigid expansion mechanism. A receiving plate is fixedly installed at the outer end of the connecting frame. Expansion elastic water bags are fixedly installed at the top and bottom of the receiving plate. The input ends of the expansion elastic water bags are communicated with the output end of the communication pipe. A water pressure sensor is fixedly installed on the back of the connecting frame. The detection end of the water pressure sensor is arranged inside the communication pipe.

6. The knee joint distraction device with flexible adjustable pressure according to claim 5, characterized in that, The rigid expansion mechanism includes a mounting frame which is fixedly installed on the side of the handle away from the flexible expansion mechanism. The outer end of the mounting frame is fixedly installed with the expansion component. A docking component is fixedly installed on the side of the expansion component close to the handle. The docking component is arranged inside the mounting frame, and the outer end of the docking component is connected to the tension sensor.

7. The knee joint spreading device with flexible adjustable pressure according to claim 6, wherein The expansion component includes a rail frame which is fixedly installed on the outside of the mounting frame. A lead screw is rotatably connected inside the rail frame. The thread directions of the two ends of the lead screw are opposite. Both ends of the lead screw are threadedly connected with movable blocks. The movable blocks are slidably connected inside the rail frame. The side of the movable block away from the handle is fixedly connected with an expansion forceps arm. The outer end of the expansion forceps arm is fixedly connected with an anti-slip forceps plate. A transmission component is arranged in the middle of the rail frame. The end of the transmission component close to the handle is connected to the docking component. The transmission component includes a sliding frame and a second gear. The sliding frame is slidably connected in the middle of the mounting frame. A second rack is fixedly connected to one side inside the sliding frame. The second gear is fixedly connected to the middle of the lead screw. The second rack and the second gear are meshed and connected. The side of the sliding frame close to the handle is connected to the docking component.

8. The knee joint distraction device with flexible adjustable pressure according to claim 6, wherein The docking component includes a side rail and a docking block. The side rail is fixedly installed at one end of the frame close to the handle. Telescopic springs are fixedly installed at both ends inside the side rail. The docking block is fixedly connected to the end of the tension sensor close to the rail frame. Slots are formed on both sides of the docking block. The outer ends of the telescopic springs are fixedly connected with sliding blocks. A clamping block is fixedly connected to the side of the sliding block close to the tension sensor. The clamping block is inserted into the inside of the slot. The overall top view shape of the inside of the slot is arranged in a right trapezoid. The outer end top view shape of the clamping block is also arranged in an isosceles trapezoid. The inclined surface of the clamping block is arranged on the side close to the docking block. A push plate is fixedly connected to the top of the sliding block.

9. The knee joint distraction device with flexible adjustable pressure according to claim 8, characterized in that, An activity frame and a tension sensor are arranged at the end of the extrusion frame away from the flexible expansion mechanism. The end of the tension sensor penetrates through the extrusion frame and is linked with the rigid expansion mechanism. A cavity is formed inside the activity frame. A switching component is arranged inside the cavity. The switching component includes an electric telescopic rod arranged inside the cavity. The output end of the electric telescopic rod is fixedly connected with an adjusting rod. One end of the adjusting rod penetrates through the activity frame and is fixedly connected with the tension sensor. First wedge-shaped blocks are fixedly connected to both the upper and lower sides of the adjusting rod. A sliding rod is arranged inside the cavity. Both ends of the sliding rod penetrate through and are slidably connected with second wedge-shaped blocks. Each second wedge-shaped block is respectively arranged in a matching manner with the corresponding first wedge-shaped block. Compression springs are sleeved on the outer sides of both ends of the sliding rod. One end of each of the two compression springs is fixedly connected with the corresponding second wedge-shaped block. A dislocation component is arranged on one side of each of the two second wedge-shaped blocks. Two third sliding grooves are formed on the side of the activity frame close to the extrusion frame.

10. The knee joint distraction device with flexible adjustable pressure according to claim 9, characterized in that, The dislocation component includes an L-shaped block, a moving plate and a first movable column arranged in the cavity. One end of the first movable column is fixedly connected to the second wedge-shaped block, and the other end of the first movable column penetrates through one side of the L-shaped block and is fixedly connected to a second movable column. An adjustment groove is formed in the moving plate, and the adjustment groove is arranged in cooperation with the second movable column. Third movable columns are fixedly connected to the bottoms of both ends of the moving plate. One end of each third movable column penetrates through and is slidably connected to a limit block, and the limit block is fixedly installed in the cavity of the movable column. A connecting rod is fixedly connected to the side of the moving plate away from the L-shaped block of the movable column. One end of the connecting rod that penetrates and extends to the third chute of the movable column is fixedly connected to a first slider of the movable column, and the first slider is fixedly connected to the extrusion frame of the movable column.

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