Jaw distraction osteogenesis device capable of controlling direction

Abstract

The invention relates to a distraction osteogenesis device, in particular to a direction-controllable jaw distraction osteogenesis device which comprises two distraction plates which are in mutual sliding insertion connection, anchorage plates are connected to the two distraction plates, and a variable adjusting structure is arranged between the two distraction plates. According to the distraction osteogenesis device, the variable adjusting structure is arranged between the two distraction plates which are connected in a sliding and inserted mode, when the variable adjusting structure is rotationally adjusted, the distance between the two distraction plates can be rapidly or slowly adjusted, and therefore when the distraction osteogenesis device conducts distraction adjustment on the jaw bone of a patient, the distraction osteogenesis device can be used for distraction osteogenesis of the patient. The traction force can be accurately adjusted and controlled, the distraction effect is improved, the adjusting mechanism is arranged between the distraction plate and the anchorage plate, the angle between the distraction plate and the anchorage plate can be adjusted according to the jaw traction directions of different patients, traction use under different conditions can be met, and the device is small and exquisite in overall structure, easy to manufacture and operate and high in practicability. The traction effect is obvious.

Description

Technical Field

[0001] The invention relates to a distraction osteogenesis device, in particular to a direction-controllable mandibular distraction osteogenesis device. Background Art

[0002] Distraction osteogenesis is a medical device used for fracture treatment and bone regeneration. It mainly promotes the growth and healing of bone tissue through mechanical traction. This device is usually used in cases of fracture nonunion, bone defects or bone deformities. Distraction osteogenesis is a surgical technology that applies a specific amount of traction or expansion force to the cut bone segments to regenerate new bone in the bone gap to lengthen or widen the bone, thereby correcting bone underdevelopment or repairing bone defects. Distraction osteogenesis technology is widely used in the treatment of maxillofacial developmental deformities, prolonging jaw growth, and improving the patient's facial shape.

[0003] However, existing distraction osteogenesis devices are relatively complex and large in size, and the traction direction is difficult to adjust and control. Conventional mandibular distractors can often only control the extension of the jaw in a single direction, and have little effect on correcting asymmetric deformities of the left and right jaws. In addition, the traction force of the distraction device is not accurately adjusted, resulting in the traction force being unable to be accurately adjusted and controlled, affecting the traction effect on the patient's jaw. Summary of the invention

[0004] The object of the present invention is to provide a direction-controllable mandibular distraction osteogenesis device to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A direction-controllable mandibular distraction osteogenesis device, comprising two distraction plates slidably plugged into each other, both distraction plates being connected with support plates, a variable adjustment structure being arranged between the two distraction plates, and belt rings being arranged on the support plates;

[0007] The variable adjustment structure comprises two coarse adjustment screws slidably plugged into each other and a fine adjustment screw threadedly connected to the two coarse adjustment screws, the thread directions of the two coarse adjustment screws are opposite, the thread directions of the two ends of the fine adjustment screw are opposite, and the thread pitch of the fine adjustment screw is smaller than the thread pitch of the coarse adjustment screw;

[0008] The two belt rings are used to be respectively mounted on the patient's first molar and canine, the variable adjustment structure is used to adjust the two belt rings to move closer or farther away from each other, the coarse adjustment screw is used to accelerate the distance between the two distraction plates to move closer or farther during the rotation adjustment process, and the fine adjustment screw is used to slowly move the distance between the two distraction plates closer or farther during the rotation adjustment process.

[0009] The controllable direction of the mandibular distraction osteogenesis device as described above: a connecting hole is provided at the central portion of the coarse adjustment screw, plug holes are symmetrically provided at one end of the coarse adjustment screw, plug rods are symmetrically fixedly connected to the cross-intersection of the two plug holes on the coarse adjustment screw, a plurality of sliding holes are provided in a circular array at one end of one of the coarse adjustment screws, and the plug rods on the two coarse adjustment screws are slidably plugged into the plug holes;

[0010] A prismatic hole is provided at the center of the fine-adjustment screw rod, and the fine-adjustment screw rod is threadedly connected in the connection holes provided on the two coarse-adjustment screw rods.

[0011] The controllable direction mandibular distraction osteogenesis device as described above: a guide rod is fixedly provided on one side of the distraction plate, a mounting hole is provided on the distraction plate, threaded holes and guide holes are provided on the distraction plate on one side of the guide rod at equal intervals, and a rotation hole is provided on the distraction plate;

[0012] The guide rod is slidably inserted in the guide hole, and the threaded hole is threadedly connected with the coarse adjustment screw.

[0013] The controllable-direction mandibular distraction osteogenesis device as described above: a second bevel gear is installed in the mounting hole provided on one of the distraction plates, a first rotating seat is fixedly connected at the center of one side of the second bevel gear, the first rotating seat is rotatably connected to the mounting hole at the corresponding position, a first rotating column is fixedly connected at the center of the other side of the second bevel gear, and the first rotating column is rotatably connected to the distraction plate at the corresponding position;

[0014] The second bevel gear is meshed with the first bevel gear. A plurality of sliding rods are fixedly connected in an annular array on the first bevel gear. The sliding rods are slidably plugged in the sliding holes.

[0015] The controllable direction of the mandibular distraction osteogenesis device as described above: a fourth bevel gear is installed in the mounting hole provided on the other distraction plate, a second rotating seat is fixedly connected to the central portion of one side of the fourth bevel gear, the second rotating seat is rotatably connected to the mounting hole at the corresponding position, a second rotating column is fixedly connected to the central portion of the other side of the fourth bevel gear, and the second rotating column is rotatably connected to the distraction plate at the corresponding position;

[0016] The fourth bevel gear is meshed and connected with the third bevel gear. A prismatic column is fixedly connected to the central portion of the third bevel gear. The prismatic column is slidably inserted in the prismatic hole.

[0017] The controllable direction mandibular distraction osteogenesis device as described above: the distraction plate and the mounting seat are connected via an adjustment mechanism, the adjustment mechanism comprising a convex slider, a semicircular plate fixedly connected to the convex slider, and a screw threadedly connected to the convex slider;

[0018] Both ends of the screw rod are provided with driving holes, the screw rod is rotatably connected in the rotating hole, and the convex slider is slidably connected in the sliding groove;

[0019] A rotation groove is provided on the arc surface of the semicircular plate, and a plurality of limit grooves are provided at equal intervals on the semicircular plate on one side of the rotation groove.

[0020] The controllable direction mandibular distraction osteogenesis device as described above: the adjustment mechanism further includes a mounting seat and a rotating block fixedly connected to the mounting seat;

[0021] A slot hole corresponding to the limiting groove is provided at the junction of the mounting seat and the rotating block, a bolt is threadedly connected to the slot hole, and the bolt is embedded in the limiting groove. A first mounting shaft is fixedly connected to one side of the mounting seat, and a second mounting shaft is slidably connected to the other side of the mounting seat.

[0022] The controllable direction mandibular distraction osteogenesis device as described above: the second mounting shaft is located at one end sliding in the mounting seat and is fixedly connected with a retaining ring, the retaining ring is fixedly connected to one end of a spring, and the other end of the spring is fixedly connected to the cavity of the mounting seat.

[0023] The controllable direction mandibular distraction osteogenesis device as described above: a connecting seat is symmetrically fixedly connected to one side of the support plate, one of the connecting seats is rotatably connected to the first mounting shaft, and the other connecting seat is rotatably connected to the second mounting shaft, and a positioning hole is provided on the side of the support plate away from the belt ring.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] By providing a variable adjustment structure between two mutually slidably plugged distraction plates, the distance between the two distraction plates can be adjusted quickly or slowly by rotating the variable adjustment structure, so that when the distraction osteogenesis device performs traction adjustment on the patient's jaw, the traction force can be accurately adjusted and controlled to improve the distraction effect. By providing an adjustment mechanism between the distraction plate and the support plate, the angle between the distraction plate and the support plate can be adjusted according to the traction direction of the jaw of different patients, which can meet the traction use under different conditions. The overall structure of the device is compact, and the manufacture and operation are simple. It can control the different growth directions of the left and right jaws, has obvious traction effect, and has a good effect on the correction of complex maxillofacial deformities. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the structure of a direction-controllable mandibular distraction osteogenesis device.

[0027] Figure 2 This is a schematic diagram of the structure of a direction-controllable mandibular distraction osteogenesis device when viewed from above.

[0028] Figure 3 This is a schematic diagram of the structure of the distraction plate in the direction-controllable mandibular distraction osteogenesis device.

[0029] Figure 4 This is a structural schematic diagram of another view of the distraction plate in the direction-controllable mandibular distraction osteogenesis device.

[0030] Figure 5 A schematic diagram of the structure of a variable adjustment structure in a direction-controllable mandibular distraction osteogenesis device.

[0031] Figure 6 Schematic diagram of the structure of the coarse adjustment screw in the direction-controllable mandibular distraction osteogenesis device.

[0032] Figure 7 This is a structural schematic diagram of another view of the coarse adjustment screw in the direction-controllable mandibular distraction osteogenesis device.

[0033] Figure 8 It is a schematic diagram of the structure of the first bevel gear in the direction-controllable mandibular distraction osteogenesis device.

[0034] Fig. 9 Schematic diagram of the structure of the fine-adjustment screw in the direction-controllable mandibular distraction osteogenesis device.

[0035] Fig.10 Schematic diagram of the structure of the semicircular plate in the mandibular distraction osteogenesis device with controllable direction.

[0036] Fig.11 It is a schematic diagram of the structure of a mounting seat in a direction-controllable mandibular distraction osteogenesis device.

[0037] Fig.12 This is a structural schematic diagram of another view of the mounting seat in the direction-controllable mandibular distraction osteogenesis device.

[0038] Fig.13 It is a schematic diagram of the structure of the second mounting axis in the mandibular distraction osteogenesis device with controllable direction.

[0039] Fig.14 Schematic diagram of the structure of the support plate in the mandibular distraction osteogenesis device with controllable direction.

[0040] In the figure: 1, tensioning plate; 2, guide rod; 3, mounting hole; 4, threaded hole; 5, guide hole; 6, rotating hole; 7, sliding groove; 8, coarse adjustment screw; 9, fine adjustment screw; 10, connecting hole; 11, plug hole; 12, plug rod; 13, sliding hole; 14, sliding rod; 15, first bevel gear; 16, second bevel gear; 17, first rotating column; 18, first rotating seat; 19, prismatic hole; 20, prismatic column; 21, third Bevel gear; 22. fourth bevel gear; 23. second rotating column; 24. second rotating seat; 25. screw; 26. driving hole; 27. embossed slider; 28. semicircular plate; 29. ​​rotating groove; 30. limiting groove; 31. rotating block; 32. mounting seat; 33. bolt; 34. first mounting shaft; 35. second mounting shaft; 36. retaining ring; 37. spring; 38. supporting plate; 39. connecting seat; 40. belt ring; 41. positioning hole. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0042] See also Figure 1 to Figure 14 In an embodiment of the present invention, a direction-controllable mandibular distraction osteogenesis device comprises two distraction plates 1 slidably plugged into each other, both distraction plates 1 are connected with support plates 38, a variable adjustment structure is provided between the two distraction plates 1, and a belt ring 40 is provided on the support plate 38;

[0043] The variable adjustment structure includes two coarse adjustment screws 8 that are slidably plugged into each other and a fine adjustment screw 9 that is threadedly connected to the two coarse adjustment screws 8. The thread directions of the two coarse adjustment screws 8 are opposite, and the thread directions of the two ends of the fine adjustment screw 9 are opposite. The thread pitch of the fine adjustment screw 9 is smaller than the thread pitch of the coarse adjustment screw 8.

[0044] The two belt rings 40 are used to be respectively mounted on the patient's first molar and canine, and the variable adjustment structure is used to adjust the two belt rings 40 to be closer or farther away from each other. The coarse adjustment screw 8 is used to accelerate the distance between the two distraction plates 1 to move closer or farther during the rotation adjustment process, and the fine adjustment screw 9 is used to slowly move the distance between the two distraction plates 1 closer or farther during the rotation adjustment process.

[0045] In this embodiment, the belt ring 40 is designed by computer and the mounting hole is 3D printed. The shape is adapted to the patient's tooth shape. The two belt rings 40 are respectively mounted on the patient's first molar and canine, and then the distance between the two distraction plates 1 is adjusted by a variable adjustment structure, so that the distance between the two distraction plates 1 is brought closer or farther away, thereby realizing traction on the patient's mandibular cut. Since the thread directions of the two coarse adjustment screws 8 are opposite, and the thread directions of the two ends of the fine adjustment screw 9 are opposite, the two ends of the fine adjustment screw 9 are respectively threadedly connected to the two coarse adjustment screws 8, and the two coarse adjustment screws 8 are slidably plugged. Therefore, when the two coarse adjustment screws 8 are rotated, the distance between the two distraction plates 1 can be adjusted. The distance can be quickly adjusted to move closer or farther away, and when the fine-tuning screw 9 is adjusted, the distance between the two coarse-adjusting screws 8 can be slowly moved closer or farther away. Since the two coarse-adjusting screws 8 are respectively connected to the two tensioning plates 1 that are slidably inserted into each other, when the distance between the two coarse-adjusting screws 8 slowly moves closer or farther away, the distance between the two tensioning plates 1 can be synchronously adjusted. When it is necessary to quickly adjust the distance between the two tensioning plates 1, the two coarse-adjusting screws 8 are adjusted. When it is necessary to accurately control the adjustment of the distance between the two tensioning plates 1 to control the change in traction force, the fine-tuning screw 9 is adjusted to make the traction force adjustment more precise and improve the traction effect.

[0046] As a further solution of the present invention, a connecting hole 10 is opened at the center of the coarse adjustment screw 8, and a plug hole 11 is symmetrically opened at one end of the coarse adjustment screw 8. A plug rod 12 is symmetrically fixedly connected to the cross intersection of the two plug holes 11 on the coarse adjustment screw 8, and a plurality of sliding holes 13 are opened in a circular array at one end of one of the coarse adjustment screws 8, and the plug rods 12 on the two coarse adjustment screws 8 are slidably plugged with the plug holes 11;

[0047] A prismatic hole 19 is provided at the center of the fine-tuning screw 9 , and the fine-tuning screw 9 is threadedly connected to the connecting holes 10 provided on the two coarse-tuning screws 8 .

[0048] In this embodiment, the insertion hole 11 on one of the coarse adjustment screws 8 is slidably plugged with the plug-in rod 12 on the other coarse adjustment screw 8, and the insertion hole 11 on the other coarse adjustment screw 8 is connected in the same way as above. The two coarse adjustment screws 8 can be connected by plugging the insertion hole 11 and the plug-in rod 12. When one of the coarse adjustment screws 8 rotates, the other coarse adjustment screw 8 can be driven to rotate together through the plugging of the insertion hole 11 and the plug-in rod 12, thereby achieving the effect of adjustment. The fine-tuning screw 9 is threadedly connected to the connecting hole 10 opened on the two coarse adjustment screws 8, thereby ensuring the adjustment effect of the variable adjustment structure and being able to switch between different adjustment rates.

[0049] As a further solution of the present invention, a guide rod 2 is fixedly provided on one side of the stretching plate 1, a mounting hole 3 is provided on the stretching plate 1, threaded holes 4 and guide holes 5 are evenly spaced on the stretching plate 1 on one side of the guide rod 2, and a rotation hole 6 is opened on the stretching plate 1;

[0050] The guide rod 2 is slidably inserted into the guide hole 5 , and the threaded hole 4 is threadedly connected with the coarse adjustment screw 8 .

[0051] In this embodiment, the guide rod 2 on one of the distraction plates 1 is slidably inserted into the guide hole 5 opened on the other distraction plate 1, and the guide rod 2 on the other distraction plate 1 is connected in the same way as above. The two distraction plates 1 can approach or move away from each other. When the patient's mandibular suture is pulled, the traction force can be adjusted by adjusting the distance between the two distraction plates 1. Since the two coarse adjustment screws 8 are respectively connected to the two distraction plates 1, when the two coarse adjustment screws 8 are adjusted, the distance between the two distraction plates 1 can be increased or reduced, thereby achieving the traction adjustment effect. When it is necessary to fine-tune the traction force between the two distraction plates 1 to achieve precise adjustment of the traction force, the fine-tuning screws 9 inside the two coarse adjustment screws 8 are adjusted, which can control the two coarse adjustment screws 8 to approach or move away from each other, thereby making the two distraction plates 1 connected to the two coarse adjustment screws 8 approach or move away from each other, thereby achieving precise control of the traction force.

[0052] As a further solution of the present invention, a second bevel gear 16 is installed in the mounting hole 3 provided on one of the tensioning plates 1, a first rotating seat 18 is fixedly connected to the center of one side of the second bevel gear 16, the first rotating seat 18 is rotatably connected to the mounting hole 3 at a corresponding position, a first rotating column 17 is fixedly connected to the center of the other side of the second bevel gear 16, the first rotating column 17 is rotatably connected to the tensioning plate 1 at the corresponding position;

[0053] The second bevel gear 16 is meshedly connected with the first bevel gear 15 . A plurality of sliding rods 14 are fixedly connected to the first bevel gear 15 in an annular array. The sliding rods 14 are slidably plugged into the sliding holes 13 .

[0054] In this embodiment, by inserting a hexagonal wrench into the slot opened on the first rotating seat 18, the second bevel gear 16 can be engaged to drive the first bevel gear 15 to rotate by rotating the first rotating seat 18. Since the sliding rod 14 fixed on the first bevel gear 15 is slidably inserted in the sliding hole 13, the coarse adjustment screw 8 can be rotated when the first bevel gear 15 rotates. Since the two coarse adjustment screws 8 are slidably inserted into each other, when one of the coarse adjustment screws 8 rotates, the other coarse adjustment screw 8 rotates synchronously, so that the distance between the two tensioning plates 1 can be adjusted to meet the adjustment of traction force.

[0055] As a further solution of the present invention, a fourth bevel gear 22 is installed in the mounting hole 3 provided on another of the tensioning plates 1, a second rotating seat 24 is fixedly connected to the center portion of one side of the fourth bevel gear 22, the second rotating seat 24 is rotatably connected to the mounting hole 3 at a corresponding position, a second rotating column 23 is fixedly connected to the center portion of the other side of the fourth bevel gear 22, the second rotating column 23 is rotatably connected to the tensioning plate 1 at the corresponding position;

[0056] The fourth bevel gear 22 is meshedly connected with the third bevel gear 21 . A prismatic column 20 is fixedly connected to the center of the third bevel gear 21 . The prismatic column 20 is slidably inserted in the prismatic hole 19 .

[0057] In this embodiment, by inserting a hexagonal wrench into the slotted hole provided on the second rotating seat 24, rotating the second rotating seat 24 can make the fourth bevel gear 22 mesh and drive to rotate the third bevel gear 21. Since the prismatic column 20 fixed on the third bevel gear 21 is slidably inserted into the prismatic hole 19 provided on the fine-adjusting screw 9, when the third bevel gear 21 rotates, the fine-adjusting screw 9 can rotate in the two coarse-adjusting screws 8. When the coarse-adjusting screw 8 is rotated, the fine-adjusting screws 9 inside the two coarse-adjusting screws 8 rotate together, so that the third bevel gear 21 meshes and drives the fourth The bevel gear 22 rotates, and when the fine-tuning screw 9 is rotated, another hexagonal wrench needs to be inserted into the first rotating seat 18 to limit the rotation of the first rotating seat 18 and avoid invalid rotation of the fine-tuning screw 9. When the coarse-adjusting screw 8 remains stationary, the reserved gap between the two coarse-adjusting screws 8 and the fine-tuning screw 9 rotates in the connecting hole 10 opened on the two coarse-adjusting screws 8 can control the distance between the two coarse-adjusting screws 8 to increase or decrease, thereby achieving precise control of the traction force, and being able to more accurately adjust the traction force at the cut seam in the later stage, thereby improving the traction effect.

[0058] As a further solution of the present invention, the tensioning plate 1 and the mounting seat 32 are connected via an adjustment mechanism, and the adjustment mechanism includes a convex slider 27, a semicircular plate 28 fixedly connected to the convex slider 27, and a screw rod 25 threadedly connected to the convex slider 27;

[0059] Both ends of the screw rod 25 are provided with driving holes 26, the screw rod 25 is rotatably connected in the rotating hole 6, and the convex slider 27 is slidably connected in the sliding groove 7;

[0060] A rotation groove 29 is formed on the arc surface of the semicircular plate 28 , and a plurality of limit grooves 30 are formed on the semicircular plate 28 at one side of the rotation groove 29 at equal intervals.

[0061] In this embodiment, the screw rod 25 can be rotated by inserting a hexagonal wrench into the driving hole 26. Since the embossed slider 27 is slidably connected in the sliding groove 7, and the embossed slider 27 is threadedly connected to the screw rod 25, when the screw rod 25 is rotated, the embossed slider 27 can be slid and adjusted in the sliding groove 7, and the position of the semicircular plate 28 on the tensioning plate 1 can be controlled. When the patient's cut seam is skewed, the position of the semicircular plate 28 can be adjusted, which is convenient for traction and improves the use effect.

[0062] As a further solution of the present invention, the adjustment mechanism further includes a mounting seat 32 and a rotating block 31 fixedly connected to the mounting seat 32;

[0063] A slot hole corresponding to the limiting groove 30 is opened at the junction of the mounting seat 32 and the rotating block 31, and a bolt 33 is threadedly connected to the slot hole. The bolt 33 is embedded in the limiting groove 30. A first mounting shaft 34 is fixedly connected to one side of the mounting seat 32, and a second mounting shaft 35 is slidably connected to the other side of the mounting seat 32.

[0064] In this embodiment, when the patient's mandibular cut joint is crooked, which affects the traction installation, the bolt 33 is loosened to disengage from the insertion in the slot. At this time, the limiting effect of the bolt 33 on the limiting slot 30 and the slot is lost, so that the rotating block 31 can be slid and adjusted in the rotating slot 29, sliding along the arc surface of the semicircular plate 28 as the trajectory, and the offset angle of the mounting seat 32 can be adjusted to meet the traction use under multiple conditions and improve the use effect.

[0065] As a further solution of the present invention, one end of the second mounting shaft 35 sliding in the mounting seat 32 is fixedly connected to a retaining ring 36 , the retaining ring 36 is fixedly connected to one end of a spring 37 , and the other end of the spring 37 is fixedly connected to the cavity of the mounting seat 32 .

[0066] In this embodiment, the sliding plug-in setting of the second mounting shaft 35 on the mounting seat 32 can meet the needs of convenient disassembly and use of the support plate 38. When the support plate 38 needs to be disassembled, the second mounting shaft 35 is pressed into the cavity of the mounting seat 32, so that the spring 37 is squeezed and maintains the rebound force. At this time, the second mounting shaft 35 is in the cavity of the mounting seat 32, and the support plate 38 can be easily removed from the first mounting shaft 34, which meets the needs of modular installation and use under different installation conditions, is convenient for cleaning and use after disassembly, and can avoid the increase in use cost caused by the unified replacement of the whole after some components are damaged or unsuitable.

[0067] As a further solution of the present invention, a connecting seat 39 is symmetrically fixedly connected to one side of the support plate 38, one of the connecting seats 39 is rotatably connected to the first mounting shaft 34, and the other connecting seat 39 is rotatably connected to the second mounting shaft 35, and a positioning hole 41 is provided on the side of the support plate 38 away from the belt ring 40.

[0068] In this embodiment, the positioning hole 41 is used for the installation and positioning of the support nail, ensuring that the distraction osteogenesis device can be installed at the patient's mandibular cut site. Through the design of the connecting seat 39, it is easy to install and disassemble on the first installation axis 34 and the second installation axis 35, achieving a modular disassembly and use effect.

[0069] The above embodiments are exemplary rather than restrictive, so the technical solutions of the present invention that can be implemented in other specific forms without departing from the spirit or basic features of the present invention are all included in the present invention.

Claims

1. A direction-controllable mandibular distraction osteogenesis device, comprising two distraction plates (1) slidably plugged into each other, both distraction plates (1) being connected to support plates (38), characterized in that: A variable adjustment structure is provided between the two distraction plates (1), and a belt ring (40) is provided on the support plate (38); The variable adjustment structure comprises two coarse adjustment screws (8) slidably plugged into each other and a fine adjustment screw (9) threadedly connected to the two coarse adjustment screws (8), the thread directions of the two coarse adjustment screws (8) are opposite, the thread directions of the two ends of the fine adjustment screw (9) are opposite, and the thread pitch of the fine adjustment screw (9) is smaller than the thread pitch of the coarse adjustment screw (8); The two belt rings (40) are used to be respectively mounted on the first molar and canine of the patient, the variable adjustment structure is used to adjust the two belt rings (40) to move closer to or farther from each other, the coarse adjustment screw (8) is used to accelerate the distance between the two distraction plates (1) to move closer to or farther from each other during the rotation adjustment process, and the fine adjustment screw (9) is used to slowly move the distance between the two distraction plates (1) to move closer to or farther from each other during the rotation adjustment process.

2. A direction-controllable mandibular distraction osteogenesis device according to claim 1, characterized in that: A connecting hole (10) is provided at the center of the coarse adjustment screw (8), a plug hole (11) is symmetrically provided at one end of the coarse adjustment screw (8), a plug rod (12) is symmetrically fixedly connected to the coarse adjustment screw (8) at the cross intersection of the two plug holes (11), a plurality of sliding holes (13) are provided in a circular array at one end of one of the coarse adjustment screws (8), and the plug rods (12) on the two coarse adjustment screws (8) are slidably plugged into the plug holes (11); A prismatic hole (19) is provided at the center of the fine-adjustment screw (9), and the fine-adjustment screw (9) is threadedly connected to the connection holes (10) provided on the two coarse-adjustment screws (8).

3. The direction-controllable mandibular distraction osteogenesis device according to claim 1, characterized in that: A guide rod (2) is fixedly provided on one side of the tensioning plate (1), a mounting hole (3) is provided on the tensioning plate (1), threaded holes (4) and guide holes (5) are evenly spaced on the tensioning plate (1) on one side of the guide rod (2), and a rotation hole (6) is provided on the tensioning plate (1); The guide rod (2) is slidably inserted into the guide hole (5), and the threaded hole (4) is threadedly connected to the coarse adjustment screw rod (8).

4. The direction-controllable mandibular distraction osteogenesis device according to claim 3, characterized in that: A second bevel gear (16) is installed in the mounting hole (3) provided on one of the tensioning plates (1); a first rotating seat (18) is fixedly connected to the center of one side of the second bevel gear (16); the first rotating seat (18) is rotatably connected to the mounting hole (3) at a corresponding position; a first rotating column (17) is fixedly connected to the center of the other side of the second bevel gear (16); the first rotating column (17) is rotatably connected to the tensioning plate (1) at a corresponding position; The second bevel gear (16) is meshedly connected with the first bevel gear (15); a plurality of sliding rods (14) are fixedly connected in an annular array to the first bevel gear (15); and the sliding rods (14) are slidably plugged into the sliding holes (13).

5. The direction-controllable mandibular distraction osteogenesis device according to claim 4, characterized in that: A fourth bevel gear (22) is installed in a mounting hole (3) provided on another of the tensioning plates (1); a second rotating seat (24) is fixedly connected to a central portion of one side of the fourth bevel gear (22); the second rotating seat (24) is rotatably connected to the mounting hole (3) at a corresponding position; a second rotating column (23) is fixedly connected to a central portion of the other side of the fourth bevel gear (22); the second rotating column (23) is rotatably connected to the tensioning plate (1) at a corresponding position; The fourth bevel gear (22) is meshedly connected with the third bevel gear (21); a prismatic column (20) is fixedly connected to the center of the third bevel gear (21); and the prismatic column (20) is slidably inserted into the prismatic hole (19).

6. The direction-controllable mandibular distraction osteogenesis device according to claim 1, characterized in that: The tensioning plate (1) and the mounting seat (32) are connected via an adjustment mechanism, wherein the adjustment mechanism comprises a convex slider (27), a semicircular plate (28) fixedly connected to the convex slider (27), and a screw rod (25) threadedly connected to the convex slider (27); Both ends of the screw rod (25) are provided with driving holes (26), the screw rod (25) is rotatably connected in the rotating hole (6), and the embossed slider (27) is slidably connected in the sliding groove (7); A rotation groove (29) is provided on the arc surface of the semicircular plate (28), and a plurality of limit grooves (30) are provided at equal intervals on the semicircular plate (28) on one side of the rotation groove (29).

7. The direction-controllable mandibular distraction osteogenesis device according to claim 6, characterized in that: The adjustment mechanism also includes a mounting seat (32) and a rotating block (31) fixedly connected to the mounting seat (32); A slot hole corresponding to the limiting groove (30) is provided at the junction of the mounting seat (32) and the rotating block (31), a bolt (33) is threadedly connected to the slot hole, and the bolt (33) is embedded in the limiting groove (30). A first mounting shaft (34) is fixedly connected to one side of the mounting seat (32), and a second mounting shaft (35) is slidably connected to the other side of the mounting seat (32).

8. The direction-controllable mandibular distraction osteogenesis device according to claim 7, characterized in that: One end of the second mounting shaft (35) that slides in the mounting seat (32) is fixedly connected to a retaining ring (36), the retaining ring (36) is fixedly connected to one end of a spring (37), and the other end of the spring (37) is fixedly connected to the cavity of the mounting seat (32).

9. The direction-controllable mandibular distraction osteogenesis device according to claim 1, characterized in that: A connecting seat (39) is symmetrically fixedly connected to one side of the support plate (38), one of the connecting seats (39) is rotatably connected to the first mounting shaft (34), and the other connecting seat (39) is rotatably connected to the second mounting shaft (35), and a positioning hole (41) is provided on the side of the support plate (38) away from the belt ring (40).

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