Screw device for minimally invasive treatment of tibial plateau fracture under arthroscope
By designing a screw device including a guide component and a fastening component, the problem that screws are difficult to fix the medial and lateral fracture fragments in tibial plateau fractures is solved, effective reduction and stable fixation of the fracture fragments are achieved, and postoperative fixation stability is improved.
Patent Information
- Application Number
- CN202510804871.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-17
- Publication Date
- 2025-09-12
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
In the existing technology, it is difficult to effectively fix the medial and lateral fracture fragments of tibial plateau fractures with screws, resulting in uneven mechanical distribution after surgery and increasing the risk of re-displacement.
A screw device including two steel plates and a guide assembly is used. The screw is synchronously passed through the nut through the guide assembly and the fastening assembly. The guide assembly is used to assist in reducing the fracture fragment and the fastening assembly is used to achieve two-point support positioning to ensure stable fixation of the screw.
It achieves effective reduction and stable fixation of the fracture fragments, avoids displacement of the fracture fragments and the tibia, improves postoperative fixation stability, and reduces the risk of re-displacement.
Smart Images
Figure CN120616738A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the field of medical technology, and in particular relates to a screw device for minimally invasive treatment of tibial plateau fractures under arthroscopy. Background Art
[0002] In the field of minimally invasive treatment of tibial plateau fractures, existing technologies mainly use screw or plate systems for fixation. Screws (usually with a diameter of 3.5mm to 6.5mm) are guided by a guide wire and directly passed through the fracture site for fixation. They are widely used for Schatzker type I-III (simple lateral fractures) and some type IV (medial fractures with the fracture line extending to the lateral side) fractures. However, in Schatzker type IV and simple type V / VI fractures, screws cannot effectively fix the fracture fragments involving the medial and lateral sides, resulting in uneven mechanical distribution after surgery and an increased risk of re-displacement. Now, a structure is proposed that can simultaneously fix the fracture fragments on both sides. Summary of the Invention
[0003] In view of the deficiencies in the prior art, the present invention provides a screw device for minimally invasive arthroscopic treatment of tibial plateau fractures, which solves the above problems.
[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: a screw device for minimally invasive treatment of tibial plateau fractures under arthroscopic scissor lift, comprising two steel plates, the two steel plates being symmetrically arranged below the end of the handle, and a screw sleeve and a nut being respectively provided on both sides of the steel plates, and the positions of the screw sleeves and the nuts on the two steel plates are opposite, a screw being horizontally threadedly connected to the screw sleeve, the other end of the screw passing through the corresponding nut and being threadedly connected to it, plugs being inserted into the grooves on both sides of the steel plates, and a slot being provided in the grooves that fits the protrusions on the plugs, the plugs being fixedly connected to the corresponding frames, and the two frames being slidably arranged at the end of the handle; further comprising a guide assembly for slidingly guiding the two steel plates, and a fastening assembly for synchronously passing the two screws through the nuts.
[0005] On the basis of the above technical solutions, the present invention also provides the following optional technical solutions:
[0006] Further technical solution: The guide assembly includes a skateboard A and a skateboard B, the frame close to the end of the handle is fixedly connected to the skateboard B, and the other frame is fixedly connected to the skateboard A. The skateboard A and the skateboard B are both inserted into the handle, and the skateboard A and the skateboard B are both slidably set on the guide rod, and the guide rod is fixedly connected to the handle; it also includes a driving assembly for making the skateboard A and the skateboard B slide toward each other.
[0007] Further technical solution: The driving assembly includes a gear and a rack, the two racks are respectively fixedly connected to the lower surface of skateboard A and the upper surface of skateboard B, and the gear is meshed and connected between the two racks, and an axis rod passes through and is fixedly connected to the axis of the gear; it also includes a limit assembly for limiting the rotation of the gear.
[0008] Further technical solution: both ends of the shaft extend through the handle, and the shaft is rotatably connected to the handle, and one end of the shaft is fixedly connected to a turntable.
[0009] Further technical solution: The limiting assembly includes a ratchet and a pawl, the ratchet is fixedly connected to the end of the shaft, and the pawl is clamped on the ratchet, and the pawl is arranged on the side of the ratchet in an inclined state.
[0010] Further technical solution: the end of the clamping claw is fixedly connected to a connecting head, and the other end of the connecting head is rotatably connected to the handle, the lower surface of the clamping claw is overlapped on it, and the fixed connection is on the side of the handle.
[0011] Further technical solution: The fastening assembly includes a connecting disk and an inner lining rod, the connecting disk is provided with a groove that fits the hexagonal protrusion on the end of the screw, and the inner lining rod is fixedly connected to the axis of the connecting disk, the inner lining rod is slidably connected to the inner wall of the sleeve, and the inner wall of the sleeve is provided with a sliding groove that fits the protrusion on the outer wall of the inner lining rod, and the sleeve is fixedly connected to the output shaft of the motor.
[0012] Further technical solution: a spring is fixedly connected to the inner bottom of the sleeve, and the other end of the spring is fixedly connected to the lining rod, the sleeve is fixedly connected to the output shaft of the motor, the motor is fixedly connected to the connecting frame, and the two connecting frames are respectively fixedly connected to their corresponding frames.
[0013] Beneficial effects
[0014] The present invention provides a screw device for arthroscopic minimally invasive treatment of tibial plateau fractures, which has the following advantages compared with the prior art:
[0015] 1. The user holds the handle so that the steel plates at its ends are on both sides of the fracture fragment and the fracture is in the middle of the steel plate. Then the user can manually turn the turntable so that the shaft fixed at its axis starts to rotate at a constant speed. At this time, the gear fixed on it starts to rotate at a constant speed. Figure 1The viewing angle rotates counterclockwise, and at this time, since the upper and lower sides of the gear are meshed with racks, the racks begin to slide toward each other in cooperation with the meshed gears, that is, at this time, slide A begins to slide toward the inside of the handle, and slide B begins to slide toward the outside of the handle, and drives the frame fixed thereon to slide synchronously, and since the two steel plates are fixed under their corresponding frames at this time, the two steel plates begin to move toward each other, that is, at this time, the steel plates begin to gradually contact with the fracture fragment, and in the process again, if there is a position deviation between the fracture fragment and the tibia, at this time, since the two steel plates are parallel to each other, they can push the fracture fragment to fit on the tibia, thereby assisting medical staff to reposition the fracture fragment to the tibia, and at this time, the steel plates are clamped on both sides of the tibia and the fracture fragment, thereby avoiding displacement of the fracture fragment and the tibia when screws are implanted in the fracture fragment and tibia, resulting in position deviation;
[0016] When the pawl is turned clockwise, the pawl is locked in the teeth of the ratchet wheel, and the pawl is locked in the teeth of the ratchet wheel, so that the pawl stops engaging the ratchet wheel. When the pawl is turned clockwise, the pawl is locked in the teeth of the ratchet wheel, and the pawl is locked in the teeth of the ratchet wheel, so that the pawl stops engaging the ratchet wheel. When the pawl is turned clockwise, the pawl is locked in the teeth of the ratchet wheel, and the pawl is locked in the teeth of the ratchet wheel, so that the pawl stops engaging the ratchet wheel. When the pawl is turned clockwise, the pawl is locked in the teeth of the ratchet wheel, and the pawl is locked in the teeth of the ratchet wheel, so that the pawl stops engaging the ratchet wheel.
[0017] 3. After the steel plate fits the fracture fragment and the tibia, the user starts the two motors at the same time, so that the sleeve fixedly connected to the output shaft starts to rotate at a uniform speed, and since the end of the lining rod is slidingly limited in the lining rod, the lining rod can drive the connecting disk fixed thereon to rotate at a uniform speed. At the same time, since the end of the connecting disk is clamped in the groove of the connecting disk, and the sleeve is threadedly connected to the screw sleeve, the screw can be driven to rotate at a uniform speed through the connecting disk. That is, at this time, the screw begins to be screwed into the steel plate with the cooperation of the screw sleeve, and since there is a spring fixedly connected between the sleeve and the lining rod, The elasticity of the spring can push the lining rod to move linearly along the connection between it and the sleeve, that is, the connecting plate can always be tightly attached to the screw, so that the connecting plate can rotate the screw to penetrate the fracture fragment and penetrate into the corresponding nut, thereby locking the two steel plates through the cooperation of the screw and the nut, so as to pass through, and since the screws penetrate into both sides of the fracture fragment respectively, the stability of the fastening can be effectively increased, and since the screws penetrate the two steel plates synchronously, they can play a role of two-point support and positioning for the steel plates, thereby avoiding the situation where the steel plates rotate and tilt during the tightening of the screws. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.
[0019] Figure 2 For the present invention Figure 1 A magnified schematic diagram of structure A in .
[0020] Figure 3 For the present invention Figure 1 A magnified schematic diagram of structure B in FIG.
[0021] Figure 4 It is an enlarged schematic cross-sectional view of the screw structure of the present invention.
[0022] Figure 5 This is an enlarged schematic diagram of the gear structure section of the present invention.
[0023] Notes on the accompanying drawings: handle 101, steel plate 201, screw sleeve 202, screw 203, nut 204, frame 205, plug 206, slide A 207, slide B 208, guide rod 209, gear 301, rack 302, shaft 303, turntable 304, ratchet 305, pawl 306, connector 307, push rod 308, connecting plate 401, lining rod 402, sleeve 403, spring 404, motor 405, connecting frame 406. DETAILED DESCRIPTION
[0024] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.
[0025] The specific implementation of the present invention is described in detail below with reference to specific embodiments.
[0026] See also Figures 1 to 5 , provided is an embodiment of the present invention, a screw device for minimally invasive arthroscopic treatment of tibial plateau fractures, comprising two steel plates 201, the two steel plates 201 being symmetrically arranged below the end of a handle 101, and a screw sleeve 202 and a nut 204 being respectively provided on both sides of the steel plate 201, and the positions of the screw sleeves 202 and the nuts 204 on the two steel plates 201 are opposite, a screw 203 is horizontally threadedly connected to the screw sleeve 202, the other end of the screw 203 passes through the corresponding nut 204 and is threadedly connected thereto, plugs 206 are inserted into the grooves on both sides of the steel plate 201, and the grooves are provided with slots that fit the protrusions on the plugs 206, the plugs 206 are fixedly connected to the corresponding frames 205, and the two frames 205 are slidably arranged at the ends of the handle 101;
[0027] It also includes a guide assembly for slidingly guiding the two steel plates 201 and a fastening assembly for allowing the two screws 203 to penetrate the nuts 204 synchronously.
[0028] Specifically, the guide assembly includes a slide plate A207 and a slide plate B208. The frame 205 close to the end of the handle 101 is fixedly connected to the slide plate B208, and the other frame 205 is fixedly connected to the slide plate A207. The slide plates A207 and B208 are both inserted into the handle 101, and the slide plates A207 and B208 are both slidably set on the guide rod 209, and the guide rod 209 is fixedly connected to the handle 101.
[0029] It also includes a driving component for making the slide plate A207 and the slide plate B208 slide toward each other.
[0030] Specifically, the drive assembly includes a gear 301 and a rack 302. The two racks 302 are fixedly connected to the lower surface of the slide A 207 and the upper surface of the slide B 208, respectively. The gear 301 is meshed and connected between the two racks 302. A shaft 303 passes through and is fixedly connected to the axis of the gear 301.
[0031] It also includes a limiting component for limiting the rotation of the gear 301.
[0032] Specifically, both ends of the shaft 303 pass through the handle 101 , and the shaft 303 is rotatably connected to the handle 101 . One end of the shaft 303 is fixedly connected to the turntable 304 .
[0033] In the new embodiment of the present invention, the user holds the handle 101 so that the steel plates 201 at the ends are located on both sides of the fracture fragment and the fracture site is located in the middle of the steel plate 201. The user then manually rotates the turntable 304, causing the shaft 303 fixed at its axis to start rotating at a constant speed. At this time, the gear 301 fixed thereon starts rotating at a constant speed. Figure 1 The viewing angle rotates counterclockwise, and at this time, since the upper and lower sides of the gear 301 are meshed with the rack 302, the rack 302 begins to slide towards each other with the cooperation of the meshed gear 301, that is, the slide A 207 begins to slide toward the inside of the handle 101, and the slide B 208 begins to slide toward the outside of the handle 101, and drives the frame 205 fixed thereon to slide synchronously, and since the two steel plates 201 are fixed under their corresponding frames 205 at this time, the two steel plates 201 begin to move towards each other, that is, the steel plate 201 begins to gradually contact the fracture fragment, and again in the process, if there is a position deviation between the fracture fragment and the tibia, at this time, since the two steel plates 201 are parallel to each other, they can push the fracture fragment to fit on the tibia, thereby assisting medical staff to reposition the fracture fragment to the tibia, and at this time, the steel plate 201 is clamped on both sides of the tibia and the fracture fragment, thereby avoiding displacement of the fracture fragment and the tibia when screws are implanted in the fracture fragment and the tibia, resulting in position deviation.
[0034] Specifically, the limiting assembly includes a ratchet 305 and a pawl 306. The ratchet 305 is fixedly connected to the end of the shaft 303, and the pawl 306 is clamped on the ratchet 305. The pawl 306 is arranged on the side of the ratchet 305 in an inclined state.
[0035] Specifically, the end of the claw 306 is fixedly connected to the connecting head 307, and the other end of the connecting head 307 is rotatably connected to the handle 101. The lower surface of the claw 306 is overlapped on the supporting rod 308, and the supporting rod 308 is fixedly connected to the side of the handle 101.
[0036] In the embodiment of the present invention, when the user rotates the turntable 304, since the ratchet 305 is fixedly connected to the end of the shaft 303, the ratchet 305 can be driven to rotate counterclockwise synchronously. Since the ratchet 305 rotates counterclockwise and the teeth on the ratchet 305 are inclined in the clockwise direction, the ratchet 305 can push the claw 306 upward through its upper teeth. That is, at this time, the claw 306 rotates clockwise with the connector 307 as the fulcrum, so that the claw 306 stops engaging the ratchet 305. However, if the ratchet 305 rotates clockwise, its upper teeth are clamped on the claw 306. 06, and because the claw 306 is tilted and overlapped on the supporting rod 308 at the bottom, the claw 306 can be rotationally limited, that is, when the ratchet 305 rotates clockwise, the claw 306 can be re-engaged in the teeth of the ratchet 305 under the action of its own weight, thereby limiting the rotation of the ratchet 305 to prevent the user from accidentally turning the turntable 304. At the same time, after the gear 301 clamps the fracture fragment, the gear 301 can be rotationally limited by the ratchet 305 to fix the relative positions of the two steel plates 201, thereby facilitating subsequent operations by the user.
[0037] Specifically, the fastening assembly includes a connecting disk 401 and an inner lining rod 402. The connecting disk 401 is provided with a groove that fits the hexagonal protrusion on the end of the screw 203, and the inner lining rod 402 is fixedly connected at the axis of the connecting disk 401. The inner lining rod 402 is slidably connected to the inner wall of the sleeve 403, and the inner wall of the sleeve 403 is provided with a sliding groove that fits the protrusion on the outer wall of the lining rod 402. The sleeve 403 is fixedly connected to the output shaft of the motor 405.
[0038] Specifically, a spring 404 is fixedly connected to the inner bottom of the sleeve 403, and the other end of the spring 404 is fixedly connected to the lining rod 402, the sleeve 403 is fixedly connected to the output shaft of the motor 405, the motor 405 is fixedly connected to the connecting frame 406, and the two connecting frames 406 are respectively fixedly connected to their corresponding frames 205.
[0039] In the embodiment of the present invention, after the steel plate 201 fits the fracture fragment and the tibia, the user starts the two motors 405 at the same time, so that the sleeve 403 fixedly connected on the output shaft thereof starts to rotate at a uniform speed, and since the end of the lining rod 402 is slidingly limited in the lining rod 402, the lining rod 402 can drive the connecting disk 401 fixedly connected thereto to rotate at a uniform speed. At the same time, since the end of the connecting disk 401 is clamped in the groove of the connecting disk 401, and the sleeve 403 is threadedly connected to the screw sleeve 202, the screw 203 can be driven to rotate at a uniform speed through the connecting disk 401 at this time, that is, at this time, the screw 203 begins to be screwed into the steel plate 201 with the cooperation of the screw sleeve 202, and since there is an elastic fixed connection between the sleeve 403 and the lining rod 402 The spring 404 can push the lining rod 402 to perform linear movement along the connection between it and the sleeve 403 through the elasticity of the spring 404, that is, the connecting plate 401 can always be tightly attached to the screw 203, so that the connecting plate 401 can rotate the screw 203 to make it penetrate the fracture fragment and penetrate into the corresponding nut 204, thereby locking the two steel plates 201 through the cooperation of the screw 203 and the nut 204, so as to pass through, and since the screw 203 penetrates the two sides of the fracture fragment respectively, it can effectively increase the stability of the fastening, and since the screw 203 penetrates the two steel plates 201 synchronously, it can play a role of two-point support and positioning for the steel plate 201, thereby avoiding the situation where the steel plate 201 rotates and tilts during the process of tightening the screw 203.
[0040] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.
[0041] The term "fixed connection" as used in this application refers to a connection in which parts or components are fixed without any relative movement. It can be categorized into two types: detachable connection and non-detachable connection.
[0042] (1) Removable connection: Components are fastened together using screws, splines, wedge pins, etc. This type of connection allows for disassembly during maintenance without damaging the components. However, the connectors used must be of the correct specifications (e.g., length of bolts, keys, wedge pins) and properly tightened.
[0043] (2) Non-detachable connections: These mainly refer to welding, riveting, and tenoning. Since parts must be forged, sawed, or oxygen-cut for disassembly during repair or replacement, they are generally not reusable. Furthermore, attention should be paid to workmanship quality, technical inspection, and remedial measures (such as calibration and polishing) during connection.
[0044] The sliding connection referred to in this application means that the component can slide along a linear trajectory, and the hinged connection referred to in this application means that the component can rotate along an axial constraint.
[0045] In some cases, the sliding connections and hinges referred to in this application may also be damped so that the components have the ability to maintain a desired position.
[0046] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.
Claims
1. A screw device for arthroscopic minimally invasive treatment of tibial plateau fractures, characterized in that: The invention comprises two steel plates (201), the two steel plates (201) are symmetrically arranged below the end of the handle (101), and a screw sleeve (202) and a nut (204) are respectively arranged on both sides of the steel plate (201), and the positions of the screw sleeve (202) and the nut (204) on the two steel plates (201) are opposite, a screw (203) is connected to the horizontal thread in the screw sleeve (202), and the other end of the screw (203) passes through the corresponding nut (204) and is threadedly connected to it, plugs (206) are inserted into the grooves on both sides of the steel plate (201), and a slot is provided in the groove to fit the protrusion on the plug (206), the plug (206) is fixedly connected to the corresponding frame (205), and the two frames (205) are slidably arranged on the end of the handle (101); It also includes a guide assembly for slidingly guiding the two steel plates (201) and a fastening assembly for allowing the two screws (203) to penetrate the nuts (204) synchronously.
2. The screw device for arthroscopic minimally invasive treatment of tibial plateau fractures according to claim 1, characterized in that: The guide assembly includes a slide plate A (207) and a slide plate B (208), the frame (205) close to the end of the handle (101) is fixedly connected to the slide plate B (208), and the other frame (205) is fixedly connected to the slide plate A (207), and the slide plates A (207) and the slide plate B (208) are both inserted into the handle (101), and the slide plates A (207) and the slide plate B (208) are both slidably arranged on a guide rod (209), and the guide rod (209) is fixedly connected in the handle (101); The invention also includes a driving assembly for causing the slide plate A (207) and the slide plate B (208) to slide toward each other.
3. The screw device for arthroscopic minimally invasive treatment of tibial plateau fractures according to claim 2, characterized in that: The driving assembly includes a gear (301) and a rack (302), wherein the two racks (302) are fixedly connected to the lower surface of the slide A (207) and the upper surface of the slide B (208), respectively, and the gear (301) is meshed and connected between the two racks (302), and a shaft (303) passes through and is fixedly connected to the axis of the gear (301); It also includes a limiting component for limiting the rotation of the gear (301).
4. The screw device for arthroscopic minimally invasive treatment of tibial plateau fractures according to claim 3, characterized in that: Both ends of the shaft (303) pass through the handle (101), and the shaft (303) is rotatably connected to the handle (101). One end of the shaft (303) is fixedly connected to a turntable (304).
5. The screw device for arthroscopic minimally invasive treatment of tibial plateau fractures according to claim 3, characterized in that: The limiting assembly includes a ratchet (305) and a claw (306), wherein the ratchet (305) is fixedly connected to the end of the shaft (303), and the claw (306) is clamped on the ratchet (305), and the claw (306) is arranged on the side of the ratchet (305) in an inclined state.
6. The screw device for arthroscopic minimally invasive treatment of tibial plateau fractures according to claim 5, characterized in that: The end of the clamping claw (306) is fixedly connected to a connector (307), and the other end of the connector (307) is rotatably connected to the handle (101). The lower surface of the clamping claw (306) is overlapped on a push rod (308), and the push rod (308) is fixedly connected to the side of the handle (101).
7. The screw device for arthroscopic minimally invasive treatment of tibial plateau fractures according to claim 1, characterized in that: The fastening assembly comprises a connecting disc (401) and an inner lining rod (402), wherein the connecting disc (401) is provided with a groove that fits the hexagonal protrusion at the end of the screw (203), and the inner lining rod (402) is fixedly connected to the axis of the connecting disc (401), the inner lining rod (402) is slidably connected to the inner wall of the sleeve (403), and the inner wall of the sleeve (403) is provided with a sliding groove that fits the protrusion on the outer wall of the inner lining rod (402), and the sleeve (403) is fixedly connected to the output shaft of the motor (405).
8. The screw device for arthroscopic minimally invasive treatment of tibial plateau fractures according to claim 7, characterized in that: A spring (404) is fixedly connected to the inner bottom of the sleeve (403), and the other end of the spring (404) is fixedly connected to the lining rod (402). The sleeve (403) is fixedly connected to the output shaft of the motor (405). The motor (405) is fixedly connected to the connecting frame (406), and the two connecting frames (406) are respectively fixedly connected to their corresponding frames (205).