Multi-directional adjustable orthopedic external fixation support
Patent Information
- Application Number
- CN202522320812.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-02
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2035-11-02
AI Technical Summary
Existing orthopedic external fixators use bearing connections, which cannot achieve multi-dimensional and multi-angle spatial adjustment. This makes it difficult to meet the precise adjustment needs of complex fracture reduction, limb deformity correction and postoperative rehabilitation, and may lead to insufficient reduction accuracy, prolonged treatment period and patient discomfort.
The hemispherical structure is connected to the spherical shells in a rotating manner. Combined with eccentric fixing and gear transmission, it realizes multi-dimensional and multi-angle adjustment between the support rods. The angle of the support rod is precisely controlled by the meshing transmission of the bevel gear driven by the drive rod, and the angle is automatically locked by the worm gear self-locking function.
It enables precise adjustment of the stent during complex fracture reduction, limb deformity correction and postoperative rehabilitation, improving reduction accuracy, shortening the treatment cycle, reducing patient discomfort, and has a compact structure that does not take up too much space.
Smart Images
Figure CN224925273U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of medical device technology, and in particular to a multi-directional adjustable orthopedic external fixation brace. Background Technology
[0002] In orthopedic clinical treatment, external fixation devices serve as core auxiliary instruments in treatment scenarios such as fracture reduction, limb deformity correction, and bone defect repair. Their functional effectiveness directly affects the patient's treatment cycle and rehabilitation outcome. With the continuous development of orthopedic medical technology, the core clinical demand for orthopedic external fixation devices has shifted from "basic fixation" to utility models that "precisely adapt to the limb's anatomical structure and dynamically meet the multi-angle adjustment needs during treatment." Especially in scenarios such as complex fracture reduction and fixation, limb lengthening surgery, and deformity correction surgery, the device needs to be able to achieve flexible and precise angle adjustment based on the patient's real-time limb reduction status and postoperative rehabilitation needs. This ensures stable reattachment of the fracture ends, restoration of normal limb alignment, and avoids complications such as soft tissue compression and circulatory disorders caused by rigid fixation angles.
[0003] Currently, most mainstream orthopedic external fixation devices use bearings as the core connector in their structural design to achieve relative movement and connection stability between the two main body segments. Bearings, with their mature mechanical transmission performance, can effectively ensure the rotational stability of the two segments of the device in the axial direction. They can meet basic requirements in linear fixation of simple fractures or angle adjustment in a single plane. However, bearings can only achieve rotational movement around a single fixed axis, and their adjustment dimension is strictly limited to a single plane, making it impossible to achieve multi-dimensional and multi-angle spatial adjustment.
[0004] In related technologies, during the treatment of periarticular fractures, the patient's limb needs to maintain dynamic adaptation in multiple dimensions such as flexion, extension, adduction, and abduction. However, the single-axis rotation of a bearing cannot cover these complex spatial angle requirements, which can easily lead to a mismatch between the support and the limb's anatomical structure, thereby affecting the accuracy of fracture reduction and even causing limited joint movement. In limb deformity correction surgery, the treatment process requires gradual adjustment of the support angle to achieve deformity correction. The single adjustment dimension of a bearing is difficult to meet the needs of step-by-step, multi-directional correction, which may prolong the treatment period or reduce the correction effect. In addition, during the postoperative rehabilitation stage, patients need to fine-tune the limb position according to the recovery progress to promote blood circulation and tissue repair. The inability of a bearing to adjust at multiple angles limits the flexibility during the rehabilitation process, which may increase patient discomfort or affect the rehabilitation progress. Utility Model Content
[0005] To address the problem that current mainstream orthopedic external fixation devices mostly use bearings to connect two main body sections, and that bearings can only rotate around a single axis in a single plane, making it impossible to achieve multi-dimensional and multi-angle spatial adjustment, it is difficult to meet the precise adjustment needs of clinical scenarios such as complex fracture reduction, limb deformity correction and postoperative rehabilitation, and may also lead to problems such as insufficient reduction accuracy, prolonged treatment cycle and patient discomfort, this utility model provides a multi-directional adjustable orthopedic external fixation device.
[0006] The multi-directional adjustable orthopedic external fixator provided by this utility model adopts the following technical solution: A multi-directional adjustable orthopedic external fixator includes: A first support rod, one end of which is connected to a second support rod, and a connecting mechanism is provided between the first and second support rods. A strap is provided at the ends of the first and second support rods that are far apart from each other, and an adjustment mechanism is provided on the outer wall of the first support rod, the adjustment mechanism being partially connected to the connecting mechanism. The connecting mechanism for adjusting the angle of the support rod includes a first spherical shell, a second spherical shell, a first drive rod, a first active bevel gear, and a passive gear ring. The first and second spherical shells are both hemispherical and rotatably connected to each other. One end of the first support rod is eccentrically fixed to the first spherical shell, and one end of the second support rod is eccentrically rotatably connected to the second spherical shell. The first drive rod is coaxially rotatably connected inside the first support rod. The first active bevel gear is coaxially fixed to the first drive rod and located inside the first spherical shell. The passive gear ring is coaxially fixed to the second spherical shell and rotates with the first spherical shell, meshing with the first active bevel gear.
[0007] By adopting the above technical solution, the connecting mechanism uses a first spherical shell and a second spherical shell that are hemispherical and rotate to each other. The design, with the first support rod eccentrically fixed to the first spherical shell and the second support rod eccentrically rotated to the second spherical shell, breaks the limitation of traditional bearings rotating along a single axis. This allows for multi-dimensional and multi-angle spatial angle adjustment between the first and second support rods, precisely adapting to the multi-angle adjustment needs of the stent in scenarios such as periarticular fracture reduction and limb deformity correction. The first drive rod is coaxially rotated within the first support rod, driving the first active bevel gear and the passive gear ring to mesh and transmit power, forming a stable gear transmission structure. The relative position of the first and second spherical shells can be precisely adjusted by controlling the rotation of the first drive rod, thereby precisely controlling the angle of the first and second support rods. This avoids loosening or displacement during adjustment, ensuring the stability of the stent for limb fixation and the accuracy of angle control. Simultaneously, the overall structure is compact, requiring minimal additional space. This facilitates angle adjustment by medical personnel through the manipulation of the first drive rod, and avoids affecting the overall safety and layout rationality of the stent due to exposed components.
[0008] Optionally, the connecting mechanism further includes a driven bevel gear, a transmission rod, and a first linkage bevel gear. The driven bevel gear is coaxially fixed on the second support rod and rotated at the end of the second spherical shell. The transmission rod is rotatably connected at the axis of the integral structure formed by the combination of the first and second spherical shells. The first linkage bevel gear is coaxially fixed on the transmission rod and meshes with the driven bevel gear.
[0009] By adopting the above technical solution, the second support rod can rotate independently around the connecting axis between itself and the second spherical shell, and in conjunction with the multi-directional rotation between the spherical shells, the dual adjustment function of "multi-directional adjustment of the spherical shell + rotation of the support rod's own axis" can be realized, which is more suitable for the complex angle requirements of the limb.
[0010] Optionally, the connecting mechanism further includes a second linkage bevel gear, a second drive rod, and a second active bevel gear. The second linkage bevel gear is coaxially fixed on the transmission rod, the second drive rod is coaxially and rotatably connected to the axis of the first drive rod, and the second active bevel gear is coaxially fixed to one end of the second drive rod and meshes with the second linkage bevel gear.
[0011] By adopting the above technical solution, the second drive rod drives the second active bevel gear to rotate, and simultaneously drives the second linkage bevel gear to mesh and link, thereby driving the transmission rod to enable it to move in sync.
[0012] Optionally, the gears in the connecting mechanism are all helical gears.
[0013] By adopting the above technical solution, it has better transmission performance than spur gears: the contact area of the tooth surface is larger when the helical gears mesh, the force is more uniform during the transmission process, which can reduce gear wear and extend the service life of the components; at the same time, the helical gear transmission can reduce transmission noise, improve operating comfort, and has higher transmission accuracy, avoiding angle adjustment errors caused by gear meshing clearance, and ensuring the stability of bracket angle control.
[0014] Optionally, the adjusting mechanism includes a worm gear, a docking groove, and a worm. The two worm gears are coaxially fixed to the other ends of the first drive rod and the second drive rod, and are coaxially arranged side by side in the first support rod. The docking groove is located on the peripheral wall of the first support rod and communicates with the internal cavity of the first support rod. The worm is rotatably engaged in the docking groove and meshes with the worm gear.
[0015] By adopting the above technical solution, the worm gear drives the worm wheel and worm gear meshing, thereby driving the first drive rod and the second drive rod to rotate respectively. Through the self-locking characteristics of the worm wheel and worm gear, the angle can be automatically locked after adjustment to prevent the stent from shifting due to external force. At the same time, the worm gear transmission has a large reduction ratio, which can realize fine angle adjustment and meet the clinical needs for high-precision control of stent angle.
[0016] Optionally, a support seat is fixed on the outer wall of the first support rod, a positioning disk is coaxially fixed on the worm gear, and a groove is provided on the peripheral wall of the positioning disk. A positioning rod is slidably engaged on the support seat, and one end of the positioning rod is inserted into the groove.
[0017] By adopting the above technical solution, mechanical locking is used to limit the rotation of the worm gear, avoiding self-locking failure caused by worm gear wear during long-term use. The double locking ensures the stability of the stent angle and reduces treatment risks.
[0018] Optionally, the positioning rod has multiple slots equidistantly arranged on its peripheral wall, and both the slots and the positioning rod have a rectangular structure.
[0019] By adopting the above technical solution, the rectangular structure can prevent relative rotation between the positioning rod and the slot, thus improving locking stability.
[0020] Optionally, a return spring is sleeved on the outside of the positioning rod, and a protrusion is fixed on the positioning rod, with both ends of the return spring abutting between the support and the protrusion.
[0021] By adopting the above technical solution, the spring force can be used to maintain a stable fit between the positioning rod and the groove, preventing the positioning rod from accidentally coming out and causing locking failure.
[0022] Optionally, a wheel is coaxially fixed to one end of the worm gear, and an elliptical handle is rotatably connected to the edge of the wheel.
[0023] By adopting the above technical solution, the worm gear can be quickly rotated by the staff using the wheel.
[0024] Optionally, the ends of the first support rod and the second support rod that are far apart from each other are rotatably connected to rectangular plates and locked with screws, and the strap is fixed to the rectangular plates.
[0025] By adopting the above technical solution, the strap can be adjusted to a fixed angle according to the shape of the patient's limb, improving the fit between the strap and the limb; at the same time, the screw locking facilitates disassembly and adjustment, and straps of different lengths or materials can be replaced according to treatment needs, enhancing the versatility of the stent.
[0026] In summary, this utility model has at least one of the following beneficial technical effects: The connecting mechanism employs a hemispherical structure with a first and second spherical shell that rotates relative to each other. This, combined with a first support rod eccentrically fixed to the first shell and a second support rod eccentrically rotatably connected to the second shell, breaks the limitations of traditional bearings that rotate along a single axis. This design allows for multi-dimensional and multi-angle spatial adjustment between the first and second support rods, precisely adapting to the multi-angle adjustment needs of the stent in scenarios such as periarticular fracture reduction and limb deformity correction. The first drive rod is coaxially rotatably connected within the first support rod, driving the first active bevel gear and the passive gear ring to mesh and form a stable gear transmission structure. By controlling the rotation of the first drive rod, the relative position of the first and second spherical shells can be precisely adjusted, thereby precisely controlling the angle of the first and second support rods. This prevents loosening or displacement during adjustment, ensuring the stability of the stent for limb fixation and the accuracy of angle control. Furthermore, the overall structure is compact, requiring minimal additional space. This facilitates angle adjustment by medical personnel through the manipulation of the first drive rod, and avoids any exposed components affecting the overall safety and layout rationality of the stent. Attached Figure Description
[0027] Figure 1 This is a schematic diagram of the external structure of a multi-directional adjustable orthopedic external fixator in this embodiment.
[0028] Figure 2 This is a partially enlarged structural diagram of this embodiment.
[0029] Figure 3 This is a schematic diagram of the connection mechanism in this embodiment.
[0030] Figure 4 This is a schematic diagram of the adjustment mechanism in this embodiment.
[0031] Explanation of reference numerals in the attached figures: 1. First support rod; 2. Second support rod; 3. Connecting mechanism; 31. First spherical shell; 32. Second spherical shell; 33. First drive rod; 34. First active bevel gear; 35. Passive gear ring; 36. Driven bevel gear; 37. Transmission rod; 38. First linked bevel gear; 39. Second linked bevel gear; 310. Second drive rod; 311. Second active bevel gear; 4. Belt; 5. Adjustment mechanism; 51. Worm gear; 52. Connecting groove; 53. Worm; 54. Support seat; 55. Positioning plate; 56. Positioning rod; 57. Return spring; 58. Protrusion; 6. Wheel. Detailed Implementation
[0032] The following is in conjunction with the appendix Figure 1-4 The present invention will be described in further detail below.
[0033] This utility model discloses a multi-directional adjustable orthopedic external fixation bracket.
[0034] It should be noted that in the description of this utility model, the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0035] Reference Figure 1 and Figure 2 A multi-directional adjustable orthopedic external fixator includes a first support rod 1, a second support rod 2, a connecting mechanism 3, a strap 4, and an adjustment mechanism 5. The first support rod 1 has one end connected to the second support rod 2, and the connecting mechanism 3 is provided between the first support rod 1 and the second support rod 2. A strap 4 is provided at the ends of the first support rod 1 and the second support rod 2 that are far apart from each other. The adjustment mechanism 5 is provided on the outer wall of the first support rod 1, and part of the adjustment mechanism 5 is connected to the connecting mechanism 3. The connecting mechanism 3, used to adjust the angle of the support rods, includes a first spherical shell 31, a second spherical shell 32, a first drive rod 33, a first active bevel gear 34, and a passive gear ring 35. The connecting mechanism 3 adopts a hemispherical structure with the first spherical shell 31 and the second spherical shell 32 rotatably connected to each other. This design, combined with the first support rod 1 being eccentrically fixed to the first spherical shell 31 and the second support rod 2 being eccentrically rotatably connected to the second spherical shell 32, breaks away from the traditional single bearing design. Despite the limitations of axial rotation, multi-dimensional and multi-angle spatial angle adjustment between the first support rod 1 and the second support rod 2 can be achieved. This allows for precise adaptation to the multi-angle adjustment needs of the stent in scenarios such as periarticular fracture reduction and limb deformity correction. The stent is coaxially connected to the first support rod 1 via the first drive rod 33, which drives the first active bevel gear 34 and the passive gear ring 35 to mesh and transmit power, forming a stable gear transmission structure. The relative position of the first spherical shell 31 and the second spherical shell 32 can be precisely adjusted by controlling the rotation of the first drive rod 33, thereby precisely controlling the angle of the first support rod 1 and the second support rod 2. This avoids loosening or displacement during adjustment, ensuring the stability of the stent for limb fixation and the accuracy of angle control. At the same time, the overall structure is compact and does not require excessive additional space. This makes it convenient for medical staff to adjust the angle by manipulating the first drive rod 33, and does not affect the overall safety and layout rationality of the stent due to exposed components.
[0036] Specifically, the first spherical shell 31 and the second spherical shell 32 are both hemispherical structures and are rotatably connected to each other. One end of the first support rod 1 is eccentrically fixed to the first spherical shell 31, and one end of the second support rod 2 is eccentrically rotatably connected to the second spherical shell 32. The first drive rod 33 is coaxially rotatably connected inside the first support rod 1. The first active bevel gear 34 is coaxially fixed to the first drive rod 33 and located inside the first spherical shell 31. The passive gear ring 35 is coaxially fixed to the second spherical shell 32 and the rotatable connection end of the first spherical shell 31, and meshes with the first active bevel gear 34.
[0037] Reference Figure 3 In this embodiment of the utility model, the connecting mechanism 3 also includes a driven bevel gear 36, a transmission rod 37, and a first linkage bevel gear 38. By utilizing the independent rotation of the second support rod 2 around the connecting axis between itself and the second spherical shell 32, and in conjunction with the multi-directional rotation between the spherical shells, the dual adjustment function of "multi-directional adjustment of the spherical shell + rotation of the support rod's own axis" of the first support rod 1 and the second support rod 2 is realized, which is more suitable for the complex angle requirements of the limbs.
[0038] Driven bevel gear 36 is coaxially fixed on the second support rod 2 and rotated at the second spherical shell 32. Transmission rod 37 is rotatably connected at the axis of the integral structure formed by the first spherical shell 31 and the second spherical shell 32. First linkage bevel gear 38 is coaxially fixed on transmission rod 37 and meshes with driven bevel gear 36.
[0039] In this embodiment of the present invention, the connecting mechanism 3 further includes a second linkage bevel gear 39, a second drive rod 310, and a second active bevel gear 311. The second linkage bevel gear 39 is coaxially fixed on the transmission rod 37. The second drive rod 310 is coaxially and rotatably connected to the axis of the first drive rod 33. The second active bevel gear 311 is coaxially fixed to one end of the second drive rod 310 and meshes with the second linkage bevel gear 39. The second drive rod 310 drives the second active bevel gear 311 to rotate and synchronously drives the second linkage bevel gear 39 to mesh and link, thereby driving the transmission rod 37 to move synchronously.
[0040] Specifically, the gears in the connecting mechanism 3 are all helical gears, which have better transmission performance than spur gears: the contact area of the tooth surface is larger when the helical gears mesh, the force is more even during transmission, which can reduce gear wear and extend the service life of the components; at the same time, the helical gear transmission can reduce transmission noise, improve operating comfort, and has higher transmission accuracy, avoiding angle adjustment errors caused by gear meshing clearance, and ensuring the stability of bracket angle control.
[0041] Reference Figure 4Specifically, in this embodiment of the present invention, the adjustment mechanism 5 includes a worm gear 51, a docking groove 52, and a worm 53. The worm gear 53 drives the worm gear 51 to mesh and move together, thereby driving the first drive rod 33 and the second drive rod 310 to rotate respectively. Through the self-locking characteristics of the worm gear, the angle can be automatically locked after adjustment to prevent the stent from shifting due to external force. At the same time, the worm gear transmission has a large reduction ratio, which can realize fine angle adjustment and meet the clinical needs for high-precision control of the stent angle.
[0042] In this embodiment of the utility model, two worm gears 51 are coaxially fixed at the other ends of the first drive rod 33 and the second drive rod 310, and are coaxially arranged side by side in the first support rod 1. The mating groove 52 is arranged on the peripheral wall of the first support rod 1 and communicates with the internal cavity of the first support rod 1. The worm 53 is rotatably engaged in the mating groove 52 and meshes with the worm gear 51.
[0043] A support seat 54 is fixed on the outer wall of the first support rod 1. A positioning plate 55 is coaxially fixed on the worm gear 53, and a groove is provided on the periphery of the positioning plate 55. A positioning rod 56 is slidably engaged on the support seat 54. One end of the positioning rod 56 is inserted into the groove. The mechanical engagement restricts the rotation of the worm gear 53, avoiding self-locking failure caused by wear of the worm gear during long-term use. The double locking ensures the stability of the support angle and reduces the treatment risk.
[0044] The positioning rod 56 has multiple slots evenly spaced on its periphery, and both the slots and the positioning rod 56 are rectangular. A return spring 57 is sleeved on the outside of the positioning rod 56, and a protrusion 58 is fixed on the positioning rod 56. The two ends of the return spring 57 abut against the support seat 54 and the protrusion 58. The rectangular structure can prevent relative rotation between the positioning rod 56 and the slot, thus improving the locking stability. The spring force can keep the positioning rod 56 and the slot in a stable fit, preventing the positioning rod 56 from accidentally coming out and causing the locking failure.
[0045] One end of the worm gear 53 is coaxially fixed with a wheel 6, and an oval handle is rotatably connected to the edge of the wheel 6. The wheel 6 allows the operator to quickly rotate the worm gear 53.
[0046] The first support rod 1 and the second support rod 2 are rotatably connected to rectangular plates at their far ends and locked with screws. The strap 4 is fixed to the rectangular plates. The strap 4 can be adjusted to fix the angle according to the shape of the patient's limb, which improves the fit between the strap 4 and the limb. At the same time, the screw locking facilitates disassembly and adjustment. Straps 4 of different lengths or materials can be replaced according to treatment needs, which enhances the versatility of the support.
[0047] The implementation principle of a multi-directional adjustable orthopedic external fixation bracket according to this utility model embodiment is as follows: First, the straps 4 at both ends of the bracket are respectively bound to the limb parts of the patient that need to be fixed, completing the initial fixation of the bracket and the limb. Then, the positioning rod 56 is pulled away from the positioning plate 55, so that one end of the positioning rod 56 is disengaged from the groove of the peripheral wall of the positioning plate 55, releasing the mechanical lock on the worm gear 53. Then, the wheel 6 is rotated to drive the worm gear 53 to rotate. The worm gear 53 meshes with the worm wheel 51 coaxially fixed at the end of the first drive rod 33. Through the worm wheel and worm gear transmission, the first drive rod 33 is driven to rotate coaxially in the first support rod 1. When the first drive rod 33 rotates, the first active bevel gear 34 coaxially fixed at its end rotates accordingly and meshes with the passive gear ring 35 coaxially fixed at the rotating connection end of the second spherical shell 32, driving the first spherical shell 31 and the second spherical shell 32 to rotate relative to each other, thereby driving the first support rod 1 and the second support rod 2 to achieve overall spatial angle adjustment. Keeping the positioning rod 56 unlocked, continue rotating the wheel 6 to drive the worm 53. The worm 53 simultaneously meshes with the worm wheel 51 coaxially fixed at the end of the second drive rod 310, causing the second drive rod 310 to rotate coaxially within the axis of the first drive rod 33. When the second drive rod 310 rotates, the second active bevel gear 311 coaxially fixed at its end meshes with the second linkage bevel gear 39 coaxially fixed on the transmission rod 37, causing the first linkage bevel gear 38 on the transmission rod 37 to rotate accordingly and mesh with the driven bevel gear 36. Finally, the second support rod 2 is driven to rotate independently around the connecting axis between itself and the second spherical shell 32, thus achieving fine angle adjustment.
[0048] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.
Claims
1. A multi-directional adjustable orthopedic external fixator, characterized in that, include: A first support rod (1) is connected to a second support rod (2) at one end, and a connecting mechanism (3) is provided between the first support rod (1) and the second support rod (2). A strap (4) is provided at the ends of the first support rod (1) and the second support rod (2) that are far apart from each other. An adjustment mechanism (5) is provided on the outer wall of the first support rod (1), and part of the adjustment mechanism (5) is connected to the connecting mechanism (3). The connecting mechanism (3) for adjusting the angle of the support rod includes a first spherical shell (31), a second spherical shell (32), a first drive rod (33), a first active bevel gear (34), and a passive gear ring (35). The first spherical shell (31) and the second spherical shell (32) are both hemispherical and are rotatably connected to each other. One end of the first support rod (1) is eccentrically fixed on the first spherical shell (31), and one end of the second support rod (2) is eccentrically rotatably connected on the second spherical shell (32). The first drive rod (33) is coaxially rotatably connected inside the first support rod (1). The first active bevel gear (34) is coaxially fixed on the first drive rod (33) and located inside the first spherical shell (31). The passive gear ring (35) is coaxially fixed on the second spherical shell (32) at the rotatable connection end with the first spherical shell (31) and meshes with the first active bevel gear (34).
2. The multi-directional adjustable orthopedic external fixator according to claim 1, characterized in that, The connecting mechanism (3) further includes a driven bevel gear (36), a transmission rod (37), and a first linkage bevel gear (38). The driven bevel gear (36) is coaxially fixed on the second support rod (2) at the rotating connection end of the second spherical shell (32). The transmission rod (37) is rotatably connected to the axis of the integral structure formed by the combination of the first spherical shell (31) and the second spherical shell (32). The first linkage bevel gear (38) is coaxially fixed on the transmission rod (37) and meshes with the driven bevel gear (36).
3. The multi-directional adjustable orthopedic external fixator according to claim 2, characterized in that, The connecting mechanism (3) further includes a second linkage bevel gear (39), a second drive rod (310), and a second active bevel gear (311). The second linkage bevel gear (39) is coaxially fixed on the transmission rod (37). The second drive rod (310) is coaxially and rotatably connected to the axis of the first drive rod (33). The second active bevel gear (311) is coaxially fixed to one end of the second drive rod (310) and meshes with the second linkage bevel gear (39).
4. The multi-directional adjustable orthopedic external fixator according to claim 3, characterized in that, The gears in the connecting mechanism (3) are all helical gears.
5. A multi-directional adjustable orthopedic external fixator according to claim 3, characterized in that, The adjustment mechanism (5) includes a worm gear (51), a docking groove (52), and a worm (53). The two worm gears (51) are coaxially fixed at the other ends of the first drive rod (33) and the second drive rod (310), and are coaxially arranged in parallel inside the first support rod (1). The docking groove (52) is located on the peripheral wall of the first support rod (1) and communicates with the internal cavity of the first support rod (1). The worm (53) is rotatably engaged in the docking groove (52) and meshes with the worm gear (51).
6. A multi-directional adjustable orthopedic external fixator according to claim 5, characterized in that, A support seat (54) is fixed on the outer wall of the first support rod (1), a positioning plate (55) is coaxially fixed on the worm gear (53), and a groove is provided on the periphery of the positioning plate (55). A positioning rod (56) is slidably engaged on the support seat (54), and one end of the positioning rod (56) is inserted into the groove.
7. A multi-directional adjustable orthopedic external fixator according to claim 6, characterized in that, The positioning rod (56) has multiple slots equidistantly arranged on its periphery, and both the slots and the positioning rod (56) are rectangular in structure.
8. A multi-directional adjustable orthopedic external fixator according to claim 6, characterized in that, The positioning rod (56) is fitted with a return spring (57) and a protrusion (58) is fixed on the positioning rod (56). The two ends of the return spring (57) abut against the support (54) and the protrusion (58).
9. A multi-directional adjustable orthopedic external fixator according to claim 5, characterized in that, One end of the worm (53) is coaxially fixed with a wheel (6), and an elliptical handle is rotatably connected to the edge of the wheel (6).
10. A multi-directional adjustable orthopedic external fixator according to claim 1, characterized in that, The first support rod (1) and the second support rod (2) are respectively rotatably connected to rectangular plates at their far ends and locked by screws, and the strap (4) is fixed to the rectangular plates.