Minimally invasive limb fracture three-dimensional traction reduction and fixation device

Abstract

The invention belongs to the technical field of fracture reduction, and aims to solve the problems that a minimally invasive limb fracture three-dimensional traction reduction and fixing device in the prior art is tedious in operation, may cause local compression of a fracture part and damage to the fracture part, and is difficult to damage to the fracture part due to local extrusion for relatively serious fractures such as comminuted fractures. The minimally invasive limb fracture three-dimensional traction reduction and fixing device comprises a first fixing mechanism and a second fixing mechanism, and the first fixing mechanism and the second fixing mechanism are arranged adjacently. The first fixing mechanism and the second fixing mechanism are connected through the traction mechanism, the fine adjustment mechanism and the distance adjustment mechanism. The first fixing mechanism and the second fixing mechanism are the same in structure. According to the invention, the rotation displacement can be conveniently corrected; the device is simple in structure and convenient to use, the fracture with angulation displacement can be integrally pulled, angulation displacement of the fracture can be integrally corrected, and angulation displacement correction can be achieved under the condition that the fracture is serious.

Description

Technical Field

[0001] The invention belongs to the technical field of fracture reduction, and in particular relates to a minimally invasive three-dimensional traction reduction and fixation device for limb fractures. Background Art

[0002] External fixation is a method of treating bone and joint injuries and correcting bone deformities by connecting bones to external devices to fix the injured limbs. In the early stage of surgery, the doctor first performs open reduction of the fracture before surgery. Due to a series of operations, the reduction of the fracture fragments is often lost, which increases the difficulty of the surgery and even causes failure. A structure is needed to improve it, that is, a minimally invasive limb fracture three-dimensional traction reduction and fixation device.

[0003] The invention patent with publication number CN109820583B discloses a minimally invasive three-dimensional traction reduction and fixation device for limb fractures, including a first fixing component, the first fixing component including a first fixing ring, a first support block, a first ball joint support and a first threaded needle, the first support block is detachably connected to the first fixing ring, the first ball joint support is located on one side of the first fixing ring, one end of the first ball joint support is fixedly connected to the first support block, and the other end of the first ball joint support is detachably connected to the first threaded needle; the first fixing component also includes a second support block, a second ball joint support and a second threaded needle, the second support block is detachably connected to the first fixing ring, the second ball joint support is located on the other side of the first fixing ring, one end of the second ball joint support is fixedly connected to the second support block, and the other end of the second ball joint support is detachably connected to the second threaded needle. Although this technical solution corrects the angular displacement of the fracture by adjusting the first ball-joint support and the second ball-joint support, and at the same time, adjusts and corrects the rotational displacement by adjusting the first support block and the second support block, and solves the shortening of the fracture by using the first adjustment member and the second adjustment member, the above technical solution adjusts the angle of the first threaded needle and the second threaded needle by adjusting the angle of the first ball-joint support and the second ball-joint support when correcting the angular displacement, and then locally squeezes the fracture site through the first threaded needle and the second threaded needle to correct it. This method not only causes local pressure on the fracture site, which may cause damage to the fracture site, but also for more serious fractures, such as comminuted fractures, it is impossible to achieve angular displacement correction through local squeezing; at the same time, when correcting the rotational displacement, it is necessary to adjust the position of each threaded needle separately to fix the middle bone, which makes the operation more cumbersome. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a minimally invasive three-dimensional traction reduction and fixation device for limb fractures.

[0005] To achieve the above object, the technical solution adopted by the present invention is: A minimally invasive three-dimensional traction reduction and fixation device for limb fractures, comprising a first fixing mechanism and a second fixing mechanism, the first fixing mechanism and the second fixing mechanism are arranged adjacent to each other, and the first fixing mechanism and the second fixing mechanism are connected through a traction mechanism, a fine adjustment mechanism and a distance adjustment mechanism; The first fixing mechanism and the second fixing mechanism have the same structure.

[0006] Preferably, the first fixing mechanism includes a fixing ring, a mounting ring, a driving gear, a first motor, a plurality of fixing components and a plurality of meshing holes. The mounting ring is rotatably sleeved on the outer surface of the fixing ring. The plurality of meshing holes are evenly spaced along the circumferential direction on the mounting ring. The plurality of fixing components are detachably arranged on the fixing ring along the circumferential direction. The first motor is arranged on the fixing ring. The driving gear is fixedly connected to the output shaft of the first motor, and the driving gear meshes with the meshing hole.

[0007] Preferably, each fixing assembly comprises a U-shaped fixing seat, a mounting seat, a limiting assembly, a rotating cylinder, a limiting ring, a fixing screw, an arc-shaped fixing plate and two telescopic rods, the U-shaped fixing seat is detachably connected to the fixing ring, the mounting seat is connected to the U-shaped fixing seat, both ends of the rotating cylinder are open, and the bottom of the rotating cylinder is rotatably connected to the top of the mounting seat, the limiting ring is connected to the inner wall of the rotating cylinder, and the meshing gear is arranged on the outer side surface of the rotating cylinder, and the gear is meshed with the meshing hole; A mounting hole connected to the interior of the rotating cylinder is provided at the top of the mounting seat, the fixing screw passes through the limiting ring and the mounting hole and extends to the outside of the mounting seat, the fixing screw is threadedly connected to the limiting ring, the arc-shaped fixing plate is arranged at the bottom of the fixing screw, the two telescopic rods are symmetrically arranged on both sides of the fixing screw, and one end of each telescopic rod is connected to the bottom of the mounting seat, and the other end is connected to the top of the arc-shaped fixing plate, and the limit is recently arranged on the mounting seat.

[0008] Preferably, the limit assembly includes a first gear, two limit columns, two connecting plates and two first gear rails. Plug holes connected to the mounting hole are respectively opened on two opposite sides of the mounting seat. The two limit columns are respectively inserted into the corresponding plug holes. The two connecting plates are respectively connected to the ends of the corresponding limit columns away from the plug holes. The two first gear rails are respectively connected to the corresponding connecting plates. The first gear is rotatably connected to the mounting seat, and the first gear is respectively meshed with the two first gear rails.

[0009] Preferably, the fine-tuning mechanism includes a sleeve, a sliding rod, a hinged rod, a U-shaped slot and a fine-tuning assembly, the telescopic sleeve and the hinged rod are respectively connected to the corresponding fixed rings, the sliding rod is slidably connected to the sleeve, the U-shaped slot is opened on the movable end of the hinged rod, the end of the sliding rod away from the sleeve is hinged to the inner wall of the U-shaped slot, and the fine-tuning assembly is respectively connected to the sliding rod and the hinged rod.

[0010] Preferably, the fine-tuning assembly includes an arc-shaped gear track, a second gear, a sliding shaft and two sliding grooves. The two sliding grooves are symmetrically arranged on the inner walls on both sides opposite to each other of the U-shaped through groove. The second gear is rotatably arranged on the bottom of the end of the sliding rod away from the sleeve. The two ends of the sliding shaft are respectively slidably connected to the two sliding grooves, one end of the arc-shaped gear track is rotatably connected to the sliding shaft, and the second gear is meshed with the arc-shaped gear track.

[0011] Preferably, the distance adjustment mechanism includes a pull rod, a second gear track, a third gear and two U-shaped fixing seats, the two U-shaped fixing seats are respectively connected to the corresponding fixing rings, the pull rod and one end of the second gear track are respectively connected to the corresponding U-shaped fixing seats, the third gear is rotatably connected to the movable end of the pull rod, and the third gear is meshed with the second gear track.

[0012] Preferably, the traction mechanism includes a second motor, a traction rope and a winding wheel, the second motor is connected to the fixing ring on the first fixing mechanism, the winding wheel is fixedly connected to the output shaft of the second motor, one end of the traction rope is connected to the winding wheel, and the other end is connected to the fixing ring on the second fixing mechanism.

[0013] Preferably, a threaded hole is provided on the top of the U-shaped fixing seat, and the mounting bolt passes through the threaded hole and abuts against the fixing ring.

[0014] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention adopts a combined design of a driving gear, a first motor, a plurality of fixing components and a plurality of meshing holes, so that by simply starting the first motor, a plurality of arc-shaped fixing plates can be driven to synchronously move toward the fracture site to fix the rotationally displaced bone, thereby facilitating correction of the rotational displacement; (2) The present invention adopts the combined design of the traction mechanism and the second fixing mechanism, and can start the second motor to drive the traction rope to reel in and pull the inclined second mechanism downward, so that the angular displacement of the fracture can be pulled as a whole, and the angular displacement of the fracture can be corrected as a whole. Moreover, since the fixing ring is pulled as a whole, not only will the fracture site be not locally compressed, and thus the fracture site will not be damaged, but also for severe fractures, such as comminuted fractures, since the fracture site is pulled as a whole, the angular displacement can be corrected even in severe fractures. (3) The present invention uses a combined design of a fine-tuning mechanism and a traction mechanism, so that a large-scale angular displacement correction can be performed first by the traction mechanism. When the angular displacement correction is almost close to normal, a fine adjustment can be performed by manually rotating the third gear. This not only makes the angular displacement correction more accurate, but also avoids the problem that the traction mechanism over-adjusts the fracture site, causing further damage to the fracture site, or making the correction effect not very good. (4) The present invention adopts a detachable connection design between the U-shaped fixing seat and the fixing ring, which can facilitate the adjustment of the position of the fixing component according to the rotational displacement position, thereby improving the correction effect of the rotational displacement. In addition, the design of the arc-shaped fixing plate enables the fixing component to contact the fracture position over a large area, thereby avoiding stress concentration and improving the correction effect of the rotational displacement. (5) The present invention adopts the design of the distance adjustment mechanism, which can increase the distance between the two fixing rings by rotating the second gear, thereby correcting the shortening deformity of the fracture. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A three-dimensional traction reduction and fixation device for minimally invasive limb fractures provided by an embodiment of the present invention Figure 1 ; Figure 2 A three-dimensional traction reduction and fixation device for minimally invasive limb fractures provided by an embodiment of the present invention Figure 2 ; Figure 3 A cross-sectional view of a minimally invasive three-dimensional traction reduction and fixation device for limb fractures provided by an embodiment of the present invention; Figure 4 is a schematic structural diagram of a first fixing mechanism in an embodiment of the present invention; Figure 5 for Figure 4 A partial enlarged schematic diagram of the middle A part; Figure 6 for Figure 4 A partial enlarged schematic diagram of the middle B part; Figure 7 is a front view of a fixing assembly in an embodiment of the present invention; Figure 8 is a rear view of the fixing assembly in the embodiment of the present invention; Fig. 9 It is a bottom view of the connection between the driven gear, the rotating cylinder and the mounting seat in the embodiment of the present invention; Fig.10 It is a connection diagram of the limit assembly and the mounting seat in an embodiment of the present invention; Fig.11 The structure of the fine adjustment mechanism in the embodiment of the present invention is shown in FIG. Figure 1 ; Fig.12 The structure of the fine adjustment mechanism in the embodiment of the present invention is shown in FIG. Figure 2 ; Fig.13 is a schematic diagram of the connection structure of the sleeve, the sliding rod and the second gear in an embodiment of the present invention; Fig.14 Schematic diagram of the connection structure of the arc gear track, the sliding shaft and the sliding groove in the embodiment of the present invention; Fig.15 is a structural schematic diagram of a distance adjustment mechanism in an embodiment of the present invention; In the figure: 1, first fixing mechanism; 11, fixing ring; 12, mounting ring; 13, driving gear; 14, first motor; 15, fixing assembly; 151, U-shaped fixing seat; 1511, mounting bolt; 152, mounting seat; 153, limiting assembly; 1531, first gear; 1532, limiting column; 1533, two connecting plates; 1534, first gear track; 1535, jack; 154, rotating cylinder; 155, limiting ring; 156, fixing screw; 157, arc fixing plate; 158. telescopic rod; 159. driven gear; 16. meshing hole; 2. second fixing mechanism; 3. traction mechanism; 31. second motor; 32. traction rope; 4. fine-tuning mechanism; 41. sleeve; 42. slide rod; 43. hinged rod; 44. U-shaped through groove; 45. fine-tuning assembly; 451. arc gear track; 452. second gear; 453. sliding shaft; 454. sliding groove; 5. distance adjustment mechanism; 51. pull rod; 52. second gear track; 53. third gear; 54. U-shaped fixing seat. DETAILED DESCRIPTION

[0016] The following is a description of the embodiments of the present invention. Figures 1 to 15 , the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] like Figures 1 to 15 As shown, an embodiment of the present invention provides a minimally invasive limb fracture three-dimensional traction reduction and fixation device, comprising a first fixing mechanism 1 and a second fixing mechanism 2, the first fixing mechanism 1 and the second fixing mechanism 2 are arranged adjacent to each other, and the first fixing mechanism 1 and the second fixing mechanism 2 are connected by a traction mechanism 3, a fine-tuning mechanism 4 and a distance adjustment mechanism 5; The first fixing mechanism 1 and the second fixing mechanism 2 have the same structure.

[0018] In the embodiment of the present invention, the first fixing mechanism 1 includes a fixing ring 11, a mounting ring 12, a driving gear 13, a first motor 14, a plurality of fixing components 15 and a plurality of meshing holes 16. The mounting ring 12 is rotatably sleeved on the outer surface of the fixing ring 11. The plurality of meshing holes 16 are evenly spaced along the circumferential direction on the mounting ring 12. The plurality of fixing components 15 are detachably arranged on the fixing ring 11 along the circumferential direction. The first motor 14 is arranged on the fixing ring 11. The driving gear 13 is fixedly connected to the output shaft of the first motor 14, and the driving gear 13 meshes with the meshing holes 16. In the embodiment of the present invention, the fixing rings on the first fixing mechanism 1 and the second fixing mechanism 2 are arranged opposite to each other, and the plurality of fixing components 15 are respectively connected to the side surfaces of the two fixing rings 11 that are away from each other; the mounting ring 12 is rotatably connected to the outer side surface of the fixing ring 11 through a bearing, and the edge of each meshing hole is an arc groove structure extending outward. Through the design of combining the arc groove and the hole, it can be ensured that the driven gear 159 and the driving gear 13 can be well meshed with the meshing hole 16, and it can be ensured that when the first motor 14 drives the driving gear 13 to rotate, it can be ensured that different teeth on the driving gear 13 can continuously enter the corresponding meshing hole 16, thereby driving the mounting ring 12 to rotate, and when the mounting ring 12 rotates, it can enable different teeth on the driven gear 159 to continuously enter the corresponding meshing hole 16, thereby driving the driven gear 159 to rotate.

[0019] In the embodiment of the present invention, each fixing assembly 15 comprises a U-shaped fixing seat 151, a mounting seat 152, a limiting assembly 153, a rotating cylinder 154, a limiting ring 155, a fixing screw 156, an arc-shaped fixing plate 157 and two telescopic rods 158. The U-shaped fixing seat 151 is detachably connected to the fixing ring 11. Specifically, a threaded hole is provided on the top of the U-shaped fixing seat 151, and a mounting bolt 1511 passes through the threaded hole and abuts against the fixing ring 11; when it is necessary to adjust the position of the arc-shaped fixing plate 157 in an annular direction according to the position of the rotational displacement, first remove the mounting bolt 1511, and then move the U-shaped fixing seat 151 on the fixing ring 11. When the position of the arc-shaped fixing plate 157 is adjusted to a suitable position, pass the mounting bolt 1511 through the threaded hole and screw it downward until the mounting bolt 1511 just abuts against the outer side surface of the fixing ring 11, then stop rotating to achieve the fixation of the U-shaped fixing seat 151 and the fixing ring 11.

[0020] The mounting seat 152 is connected to the U-shaped fixing seat 151, the two ends of the rotating cylinder 154 are open, and the bottom of the rotating cylinder 154 is rotatably connected to the top of the mounting seat 152, the limiting ring 155 is connected to the inner wall of the rotating cylinder 154, and the driven gear 159 is arranged on the outer surface of the rotating cylinder 154, and the driven gear 159 is meshed with the meshing hole 16; The top of the mounting seat 152 is provided with a mounting hole connected to the inside of the rotating cylinder 154. The fixing screw 156 passes through the limiting ring 155 and the mounting hole and extends to the outside of the mounting seat 152. The fixing screw 156 is threadedly connected to the limiting ring 155. The arc-shaped fixing plate 157 is arranged at the bottom of the fixing screw 156. Two telescopic rods 158 are symmetrically arranged on both sides of the fixing screw 156, and one end of each telescopic rod 158 is connected to the bottom of the mounting seat 152, and the other end is connected to the top of the arc-shaped fixing plate 157. The limiting assembly 153 is arranged on the mounting seat 152. In the embodiment of the present invention, the telescopic rod 158 adopts an existing conventional sleeve and sleeve rod structure, and the sleeve rod is slidably sleeved inside the sleeve and will not be separated from the sleeve. Specifically, one end of the sleeve rod is slidably sleeved with the sleeve, and the other end is connected to the top of the arc-shaped fixing plate 157, and the top of the sleeve is connected to the bottom of the mounting seat 152. Through the design of the telescopic rod 158, it can not only cooperate with the fixed screw 156 to be extended and retracted, but also limit the fixed screw 156 when the limit ring 155 rotates, so as to prevent it from following the limit ring 155 in order to rotate. As a result, when the limit ring 155 rotates, the fixed screw 156 can move up and down, thereby driving the arc-shaped fixed plate 157 to move up and down.

[0021] After the position of the arc-shaped fixing plate 157 is adjusted according to the position of the rotational displacement, the first motor 14 is started to drive the driving gear 13 to rotate. Under the meshing force of the driving gear 13 and the meshing hole 16, the mounting ring 12 is driven to rotate. Under the meshing force of the driven gear 159 and the meshing hole 16, the driven gear 159 is driven to rotate synchronously, thereby driving the limit ring 155 to rotate, so that the fixing screw 156 moves downward, thereby driving the arc-shaped fixing plate 157 to move downward. When the arc-shaped fixing plate 157 contacts the part of the limb that needs to be corrected by the rotational displacement and the fracture part is fixed, the first motor 14 is turned off.

[0022] In the embodiment of the present invention, the limiting assembly 153 includes a first gear 1531, two limiting columns 1532, two connecting plates 1533 and two first gear rails 1534. Plug holes 1535 connected to the mounting holes are respectively provided on two opposite side surfaces of the mounting seat 152. The two limiting columns 1532 are respectively inserted into the corresponding plug holes 1535. The two connecting plates 1533 are respectively connected to the ends of the corresponding limiting columns 1532 away from the plug holes 1535. The two first gear rails 1534 are respectively connected to the corresponding connecting plates 1533. The first gear 1531 is rotatably connected to the mounting seat 152. Specifically, the first gear 1531 is rotatably arranged on the surface of the mounting seat 152 opposite to the connecting surface of the U-shaped fixing seat 151, and the two first gear rails 1534 are respectively located on the upper side and the lower side of the first gear 1531. The first gear 1531 is respectively meshed with the two first gear rails 1534.

[0023] When the arc-shaped fixing plate 157 contacts the part of the limb that needs to be corrected by rotational displacement to fix the fracture site, the first gear 1531 is rotated to drive the two first gear tracks 1534 to move closer to each other, thereby driving the two limit columns 1532 to move toward the inside of the socket 1535. When the end of the limit column 1532 abuts against the fixing screw 156, the first gear 1531 is stopped from rotating to lock the fixing screw 156, thereby avoiding accidental contact that causes the position of the fixing screw 156 to change, thereby affecting the effect of fracture fixation.

[0024] In the embodiment of the present invention, the fine-tuning mechanism 4 comprises a sleeve 41, a slide bar 42, a hinged rod 43, a U-shaped slot 44 and a fine-tuning assembly 45. The sleeve 41 and the hinged rod 43 are respectively connected to the corresponding fixing ring 11, specifically, the sleeve 41 and the hinged rod 43 are respectively connected to the side surfaces close to the two fixing rings, the slide bar 42 is slidably sleeved with the sleeve 41, and the existing limit structure is adopted between the slide bar 42 and the sleeve 41, so that the slide bar 42 will not be separated from the sleeve 41 during the sliding process. The U-shaped slot 44 is provided on the movable end of the hinged rod 43, and the end of the slide bar 42 away from the sleeve 41 is hinged to the inner wall of the U-shaped slot 44, specifically, the end of the slide bar 42 away from the sleeve 41 is hinged to the inner wall of the end of the U-shaped slot 44 close to the slide bar through a rotating shaft; the fine-tuning assembly 45 is respectively connected to the slide bar 42 and the hinged rod 43.

[0025] In the embodiment of the present invention, the traction mechanism 3 includes a second motor 31, a traction rope 32 and a winding wheel 33 (not shown in the figure), the second motor 31 is connected to the fixing ring 11 on the first fixing mechanism 1, and the winding wheel 33 is fixedly connected to the output shaft of the second motor 31. The winding wheel 33 adopts an existing structure as long as the line can be wound on it. One end of the traction rope 32 is connected to the winding wheel 33, and the other end is connected to the fixing ring 11 on the second fixing mechanism 2.

[0026] When it is necessary to correct a large degree of angular displacement, firstly, the fixing rings 11 on the first fixing mechanism 1 and the second fixing mechanism 2 are respectively mounted on the proximal and distal ends of the fracture site and fixed, and the fixing ring 11 on the second fixing mechanism 2 is fixed to the side where the angular displacement needs to be corrected, and then the second motor 31 is started to drive the traction rope 32 to wrap around the winding wheel 33, the traction rope 32 is shortened, and the fixing ring 11 on the second fixing mechanism 2 is pulled to rotate downward around the hinge point of the slide rod 42 and the U-shaped through groove 44. At this time, as the fixing ring 11 moves downward to correct the angular displacement, the sliding shaft 453 slides along the sliding groove 454, and drives the arc gear track 451 to rotate synchronously along the second gear 452, to ensure that the fixing ring 11 moves downward to correct the angular displacement.

[0027] In the embodiment of the present invention, the fine adjustment assembly 45 comprises an arc gear track 451, a second gear 452, a sliding shaft 453 and two sliding grooves 454, the two sliding grooves 454 are symmetrically arranged on the inner walls of the two opposite sides of the U-shaped through groove 44, the second gear 452 is rotatably arranged on the bottom of one end of the slide rod 42 away from the sleeve 41, the two ends of the sliding shaft 453 are respectively slidably connected with the two sliding grooves 454, one end of the arc gear track 451 is rotatably connected with the sliding shaft 453, and the second gear 452 is meshed with the arc gear track 451. A handle is arranged on the second gear 452 for easy rotation.

[0028] When the angular displacement is basically corrected to normal by the traction mechanism 3, the second motor 31 is turned off, and then the doctor rotates the second gear 452 through the handle set on the second gear 452. Under the action of the meshing force between the second gear 452 and the arc gear track 451, the arc gear track 451 is driven to rotate, and then the hinge rod 43 is driven to rotate slowly downward around the hinge point between the slide rod 42 and the U-shaped through groove 44, and the fixing ring 11 on the second fixing mechanism 2 is driven to move slowly downward, and the angular displacement is further slightly corrected until it is corrected to the normal position, and the rotation of the second gear 452 is stopped, thereby improving the effect of angular displacement correction and avoiding the problem of excessive adjustment of the fracture site by the traction mechanism 3, which may cause further injury to the fracture site.

[0029] In the embodiment of the present invention, the distance adjustment mechanism 5 comprises a pull rod 51, a second gear track 52, a third gear 53 and two U-shaped fixing seats 54. The two U-shaped fixing seats 54 are respectively connected to the corresponding fixing rings 11. The pull rod 51 and one end of the second gear track 52 are respectively connected to the corresponding U-shaped fixing seats 54. The third gear 53 is rotatably connected to the movable end of the pull rod 51, and the third gear 53 is meshed with the second gear track 52. The third gear 53 is provided with a knob for facilitating the rotation of the third gear 53. When the shortening deformity of the fracture needs to be corrected, the two fixing rings 11 are respectively mounted and fixed on the two ends of the fracture part to be corrected, and then the third gear 53 is rotated to drive the second gear track 52 to move along the third gear 53 in a direction away from the third gear 53, thereby gradually increasing the distance between the two fixing rings 11, thereby correcting the shortening deformity of the fracture.

[0030] When it is necessary to use the minimally invasive limb fracture three-dimensional traction reduction and fixation device provided by the embodiment of the present invention to correct the rotationally displaced fracture, firstly, the position of the arc-shaped fixing plate 157 is circumferentially adjusted according to the position of the rotational displacement, specifically, the mounting bolt 1511 is removed, and then the U-shaped fixing seat 151 is moved on the fixing ring 11. When the position of the arc-shaped fixing plate 157 is adjusted to a suitable position, the mounting bolt 1511 is passed through the threaded hole and screwed downward until the mounting bolt 1511 just contacts the outer side surface of the fixing ring 11, and then the rotation is stopped to fix the U-shaped fixing seat 151 and the fixing ring 11; then, the two fixing rings 11 are sleeved on the proximal and distal ends of the fracture site, and the first motor 14 is started to drive the driving gear 13 to rotate, and the meshing force between the driving gear 13 and the meshing hole 16 is increased. Under the action, the mounting ring 12 is driven to rotate, and under the meshing force of the driven gear 159 and the meshing hole 16, the driven gear 159 is driven to rotate synchronously, thereby driving the limit ring 155 to rotate, so that the fixing screw 156 moves downward, thereby driving the arc fixing plate 157 to move downward, and when the arc fixing plate 157 contacts and squeezes the limb part that needs to be rotated and corrected, the fracture part is fixed and corrected, and then the first motor 14 is turned off, and the two first gear tracks 1534 are driven to move closer to each other by rotating the first gear 1531, thereby driving the two limit columns 1532 to move toward the inside of the jack 1535, and when the end of the limit column 1532 abuts against the fixing screw 156, the first gear 1531 is stopped from rotating to achieve the locking of the fixing screw 156.When a large-scale angular displacement needs to be corrected, the fixing rings 11 on the first fixing mechanism 1 and the second fixing mechanism 2 are firstly sleeved on the proximal end and the distal end of the fracture site, and fixed, and the fixing ring 11 on the second fixing mechanism 2 is fixed to the side where the angular displacement needs to be corrected, and then the second motor 31 is started to drive the traction rope 32 to be wound around the winding wheel 33, the traction rope 32 is shortened, and the fixing ring 11 on the second fixing mechanism 2 is pulled to rotate downward around the hinge point between the slide bar 42 and the U-shaped through groove 44 to correct the angular displacement; when the angular displacement is corrected to be basically normal by the traction mechanism 3, the second motor 31 is turned off, and then the doctor rotates the second gear 452 through the handle set on the second gear 452, and the second gear 452 is rotated. Under the action of the meshing force between 452 and the arc gear track 451, the arc gear track 451 is driven to rotate, thereby driving the hinge rod 43 to slowly rotate downward around the hinge point between the slide rod 42 and the U-shaped through groove 44, driving the fixing ring 11 on the second fixing mechanism 2 to slowly move downward, and further slightly correct the angular displacement until it is corrected to the normal position, and the rotation of the second gear 452 is stopped; and when it is necessary to correct the shortening deformity of the fracture, the two fixing rings 11 are respectively mounted and fixed on the two ends of the fracture part to be corrected, and then the third gear 53 is rotated to drive the second gear track 52 to move along the third gear 53 in the direction away from the third gear 53, thereby gradually increasing the distance between the two fixing rings 11, and then correcting the shortening deformity of the fracture.

[0031] Although the 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 the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A minimally invasive three-dimensional traction reduction and fixation device for limb fractures, characterized in that: The invention comprises a first fixing mechanism (1) and a second fixing mechanism (2), wherein the first fixing mechanism (1) and the second fixing mechanism (2) are arranged adjacent to each other, and the first fixing mechanism (1) and the second fixing mechanism (2) are connected via a traction mechanism (3), a fine adjustment mechanism (4) and a distance adjustment mechanism (5); The first fixing mechanism (1) and the second fixing mechanism (2) have the same structure.

2. The minimally invasive limb fracture three-dimensional traction reduction and fixation device according to claim 1, characterized in that: The first fixing mechanism (1) comprises a fixing ring (11), a mounting ring (12), a driving gear (13), a first motor (14), a plurality of fixing components (15) and a plurality of meshing holes (16); the mounting ring (12) is rotatably sleeved on the outer surface of the fixing ring (11); the plurality of meshing holes (16) are evenly spaced and arranged on the mounting ring (12) along a circumferential direction; the plurality of fixing components (15) are detachably arranged on the fixing ring (11) along a circumferential direction; the first motor (14) is arranged on the fixing ring (11); the driving gear (13) is fixedly connected to an output shaft of the first motor (14); and the driving gear (13) meshes with the meshing holes (16).

3. The minimally invasive limb fracture three-dimensional traction reduction and fixation device according to claim 2, characterized in that: Each fixing assembly (15) comprises a U-shaped fixing seat (151), a mounting seat (152), a limiting assembly (153), a rotating cylinder (154), a limiting ring (155), a fixing screw (156), an arc-shaped fixing plate (157) and two telescopic rods (158); the U-shaped fixing seat (151) is detachably connected to the fixing ring (11); the mounting seat (152) is connected to the U-shaped fixing seat (151); both ends of the rotating cylinder (154) are open, and the bottom of the rotating cylinder (154) is rotatably connected to the top of the mounting seat (152); the limiting ring (155) is connected to the inner wall of the rotating cylinder (154); a driven gear (159) is arranged on the outer surface of the rotating cylinder (154); and the driven gear (159) is meshed with the meshing hole (16); A mounting hole communicating with the interior of the rotating cylinder (154) is provided at the top of the mounting seat (152); a fixing screw (156) passes through a limiting ring (155) and the mounting hole and extends to the outside of the mounting seat (152); the fixing screw (156) is threadedly connected to the limiting ring (155); an arc-shaped fixing plate (157) is arranged at the bottom of the fixing screw (156); two telescopic rods (158) are symmetrically arranged on both sides of the fixing screw (156); one end of each telescopic rod (158) is connected to the bottom of the mounting seat (152) and the other end is connected to the top of the arc-shaped fixing plate (157); and a limiting assembly (153) is arranged on the mounting seat (152).

4. The minimally invasive limb fracture three-dimensional traction reduction and fixation device according to claim 3, characterized in that: The limiting assembly (153) comprises a first gear (1531), two limiting posts (1532), two connecting plates (1533) and two first gear tracks (1534); two opposite side surfaces of the mounting seat (152) are respectively provided with plug holes (1535) connected to the mounting holes; the two limiting posts (1532) are respectively inserted into the corresponding plug holes (1535); The two connecting plates (1533) are respectively connected to one end of the corresponding limiting column (1532) away from the insertion hole (1535), the two first gear tracks (1534) are respectively connected to the corresponding connecting plates (1533), the first gear (1531) is rotationally connected to the mounting seat (152), and the first gear (1531) is respectively meshed with the two first gear tracks (1534).

5. The minimally invasive limb fracture three-dimensional traction reduction and fixation device according to claim 2, characterized in that: The fine-tuning mechanism (4) comprises a sleeve (41), a slide bar (42), a hinged rod (43), a U-shaped through groove (44) and a fine-tuning assembly (45); the sleeve (41) and the hinged rod (43) are respectively connected to corresponding fixed rings (11); the slide bar (42) is slidably sleeved with the sleeve (41); the U-shaped through groove (44) is provided on the movable end of the hinged rod (43); an end of the slide bar (42) away from the sleeve (41) is hinged to the inner wall of the U-shaped through groove (44); and the fine-tuning assembly (45) is respectively connected to the slide bar (42) and the hinged rod (43).

6. The minimally invasive limb fracture three-dimensional traction reduction and fixation device according to claim 5, characterized in that: The fine adjustment assembly (45) comprises an arc-shaped gear track (451), a second gear (452), a sliding shaft (453) and two sliding grooves (454). The two sliding grooves (454) are symmetrically arranged on the inner walls of the U-shaped through groove (44) on both sides opposite to each other. The second gear (452) is rotatably arranged on the bottom of one end of the slide rod (42) away from the sleeve (41). The two ends of the sliding shaft (453) are respectively slidably connected to the two sliding grooves (454). One end of the arc-shaped gear track (451) is rotatably connected to the sliding shaft (453), and the second gear (452) is meshed with the arc-shaped gear track (451).

7. The minimally invasive limb fracture three-dimensional traction reduction and fixation device according to claim 1, characterized in that: The distance adjustment mechanism (5) comprises a pull rod (51), a second gear track (52), a third gear (53) and two U-shaped fixing seats (54), the two U-shaped fixing seats (54) are respectively connected to corresponding fixing rings (11), one end of the pull rod (51) and the second gear track (52) are respectively connected to corresponding U-shaped fixing seats (54), the third gear (53) is rotatably connected to the movable end of the pull rod (51), and the third gear (53) is meshed with the second gear track (52).

8. The minimally invasive limb fracture three-dimensional traction reduction and fixation device according to claim 1, characterized in that: The traction mechanism (3) comprises a second motor (31), a traction rope (32) and a winding wheel (33); the second motor (31) is connected to a fixing ring (11) on the first fixing mechanism (1); the winding wheel (33) is fixedly connected to an output shaft of the second motor (31); one end of the traction rope (32) is connected to the winding wheel (33) and the other end is connected to the fixing ring (11) on the second fixing mechanism (2).

9. The minimally invasive limb fracture three-dimensional traction reduction and fixation device according to claim 3, characterized in that: A threaded hole is provided at the top of the U-shaped fixing seat (151), and a mounting bolt (1511) passes through the threaded hole and abuts against the fixing ring (11).

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