Skull arc motion bone transport external fixator

Abstract

The application discloses a skull arc motion bone moving external fixing frame, which comprises a threaded flat rod, an extension device connected to one end of the threaded flat rod, connecting rods arranged at the ends of the threaded flat rod and the extension device away from each other, and rotating needle clamps arranged at the ends of the connecting rods, wherein the threaded flat rod is hinged to the extension device, the two connecting rods are perpendicular to the plane where the threaded flat rod and the extension device are folded at an angle, and the rotating needle clamps are coaxially connected to the connecting rods; the threaded flat rod is provided with a sliding block, the sliding block is slidably connected to the threaded flat rod, two advancing nuts are arranged on the threaded flat rod, and the advancing nuts are threadedly connected to the threaded flat rod; the extension device comprises a lead screw, a connecting head arranged at one end of the lead screw, an adjusting knob arranged on the lead screw, and an extension pipe, wherein the lead screw is fixedly connected to the connecting head, the adjusting knob is threadedly connected to the lead screw, the extension pipe is slidably connected to the lead screw, and the extension pipe is coaxially connected to the adjusting knob.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a skull arc motion bone moving external fixation frame. BACKGROUND

[0002] In the case of skull fracture or skull defect in craniotomy, generally, the clinical modification is performed by using biological or metallic materials of different species, which brings many disadvantages such as foreign body rejection, cold and hot expansion, etc. Russian literature and clinical data show that bone moving is a very effective operation for repairing bone defects and treating brain ischemic necrosis. Since the operation is performed on the skull, professional medical devices are needed to fix and achieve the purpose of bone moving, to help the damaged bone to recover and heal as soon as possible, and to stimulate the blood supply of the brain to improve the ischemia of the brain. The skull external fixation frame is a professional medical device used in clinical operation. At present, the commonly used orthopedic ring rod combination external fixation frame in the domestic and foreign medical market is mostly a combination of universal ring and threaded rod, which generally has the following shortcomings: 1. The existing devices have only fixed arc, which cannot accommodate all patients with different skull arcs, and cannot accurately slide and fix according to the different arcs of the skull during bone moving; 2. The existing device structure is complex, the combination operation is complicated, and it is difficult to master and operate. SUMMARY

[0003] The purpose of the present application is to provide a skull arc motion bone moving external fixation frame, which solves the technical problems mentioned in the background and realizes accurate sliding and reliable fixation of the arc trajectory, the sliding speed can be controlled by human and stopped at any time, and the arc trajectory of bone moving can be adjusted according to the actual situation of the patient.

[0004] To achieve the above purpose, the present application adopts the following technical solutions:

[0005] An external fixator for cranial arc-motion bone transport includes a threaded flat bar, an extension device connected to one end of the threaded flat bar, a connecting rod disposed at the ends of the threaded flat bar and the extension device that are far apart from each other, and rotating pin clamps disposed at both ends of the connecting rod. The threaded flat bar is hinged to the extension device, and the two connecting rods are fixedly connected to the threaded flat bar and the extension device respectively. Both connecting rods are perpendicular to the plane where the threaded flat bar and the extension device are in an angled state. The rotating pin clamps are coaxially rotatably connected to the connecting rod. The threaded flat bar has a slider with a flat through-hole groove. The slider is fitted onto the threaded flat bar and slidably connected to the threaded flat bar. The threaded flat bar has two push nuts, which are respectively disposed on both sides of the slider and threadedly connected to the threaded flat bar. The extension device includes a lead screw, a connector disposed at one end of the lead screw, an adjusting knob disposed on the lead screw, and an extension tube. The adjusting knob is located between the connector and the extension tube. The lead screw is fixedly connected to the connector, the adjusting knob is threadedly connected to the lead screw, the extension tube is slidably connected to the lead screw, and the extension tube is coaxially rotatably connected to the adjusting knob.

[0006] Furthermore, the adjusting knob includes two short tubes, a first and a second, coaxially connected. The inner diameter of the second short tube is larger than that of the first short tube. The first short tube is threaded onto a lead screw and connected to the lead screw. The second short tube is positioned away from the connector of the first short tube. The outer diameter of the extension tube is the same as the inner diameter of the second short tube. One end of the extension tube is inserted into the second short tube. The extension tube and the second short tube are coaxially rotatably connected. The end of the extension tube inserted into the second short tube is provided with an annular groove around its outer circumference. An annular elastic washer is provided on the inner wall of the second short tube, and the annular elastic washer engages with the annular groove.

[0007] Furthermore, the end of the first short tube near the second short tube has an inwardly formed cavity, and a compression spring is provided in the cavity. A steel ball is provided at the end of the compression spring away from the bottom of the cavity. The end of the extension tube inserted into the second short tube has multiple arc-shaped grooves. The steel ball and the compression spring are in rolling connection as are the steel ball and the extension tube.

[0008] Furthermore, the extension tube has a strip-shaped display hole along its length, and a scale line is provided on the extension tube on one side of the strip-shaped display hole along its length. A pointer is provided on the lead screw, and the pointer is slidably connected to the extension tube inside the strip-shaped display hole.

[0009] Furthermore, the connector has a Y-shaped structure, including a U-shaped lug and a sleeve. The sleeve is fitted onto the end of the lead screw, and the end of the lead screw has an oblique hole with an angle of 72° between the opening direction of the oblique hole and the length direction of the lead screw. The sleeve has corresponding openings at both ends of the oblique hole, and a pin is provided in the oblique hole to pass through the sleeve and the lead screw. The sleeve and the lead screw are connected and fixed by the pin.

[0010] Further, one end of the threaded flat rod is provided with a hinged rod, and the hinged rod and the U-shaped ear plate are both provided with a hinge hole, and the U-shaped ear plate is clamped on the hinged rod and hinged with the hinged rod through a pin.

[0011] Further, the end of the threaded flat rod away from the hinged rod and the end of the extension pipe away from the connector are both provided with a sleeve connecting rod, the sleeve connecting rod is a rod member with an elliptical structure in cross section, a flat hole is formed in the abdomen of the connecting rod, the connecting rod is sleeved on the sleeve connecting rod, and connecting holes are formed in the connecting rod and the sleeve connecting rod, and the connecting rod and the sleeve connecting rod are connected and fixed through a pin.

[0012] Further, one end of the threaded flat rod is provided with a hinged rod, and the hinged rod and the U-shaped ear plate are both provided with a hinge hole, and the U-shaped ear plate is clamped on the hinged rod and hinged with the hinged rod through a pin.

[0013] Further, the sliding block is provided with a plurality of small holes one for accommodating bone pins, the opening direction of the small holes one is perpendicular to the plane where the threaded flat rod and the connecting rod are located together, the rotating pin clamp is provided with small holes two, the opening direction of the small holes two is perpendicular to the length direction of the connecting rod, and the sliding block and the rotating pin clamp are both provided with a jack, the jack on the sliding block is perpendicular to and penetrates the small holes one, and the jack on the rotating pin clamp is perpendicular to and penetrates the small holes two.

[0014] Further, the sliding block is provided with a threaded hole which is perpendicular to the opening direction of the flat hole and penetrates the flat hole, and the threaded hole is provided with a jack.

[0015] Compared with the prior art, the present application has the following characteristics and beneficial effects:

[0016] The present application sets up an effective skull arc movement bone moving external fixation frame by setting the threaded flat rod, the extension device, the connecting rod, the rotating pin clamp and the sliding block, and the bone pins installed on the sliding block can be adjusted and moved along the required arc trajectory at any time through the movable sliding block and the length-adjustable extension device, the angle between the threaded flat rod and the extension device can be changed according to the skull arc of the patient, thereby meeting the use requirements of patients with various skull arcs, the skull free bone block can be accurately positioned in the length and angle of the arc direction, the clinical use requirements are better met, the precision is improved, the structure is simple and the adjustment is convenient; the compression spring, the steel ball and the arc-shaped groove are arranged in the extension device, the steel ball is continuously pushed out by the compression spring when the extension pipe is rotated, and there is a clear jerk feeling when the steel ball is rotated into the arc-shaped groove each time, so that the user can more accurately master the length adjustment of the extension device, and the present application has the characteristics of safety and applicability, has good popularization and practical value, and will generate good economic benefits after being widely popularized and applied. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 Fig. 1 is a schematic diagram of a partial cross-sectional structure of the present application;

[0018] Figure 2 Fig. 2 is a schematic diagram of a structure of a threaded flat rod and an extension device in a folded corner state of the present application;

[0019] Figure 3 Fig. 3 is a schematic diagram of a partial cross-sectional structure of the extension device of the present application;

[0020] Figure 4 Fig. 4 is a schematic diagram of a partial cross-sectional structure of a screw rod of the present application; Figure 3 Fig. 5 is a schematic diagram of an enlarged structure at B of Fig. 4;

[0021] Figure 5 Fig. 6 is a schematic diagram of a partial cross-sectional structure of an extension tube of the present application;

[0022] Figure 6 Fig. 7 is a schematic diagram of a partial cross-sectional structure of a connecting rod of the present application;

[0023] Figure 7 Fig. 8 is a schematic diagram of a partial cross-sectional structure of a rotating needle clamp of the present application;

[0024] Figure 8 Fig. 9 is a schematic diagram of a partial cross-sectional structure of a threaded flat rod of the present application;

[0025] Figure 9 Fig. 10 is a schematic diagram of a partial cross-sectional structure of a connecting head of the present application;

[0026] Figure 10 Fig. 11 is a schematic diagram of a partial cross-sectional structure of an adjusting knob of the present application;

[0027] Figure 11 Fig. 12 is a schematic diagram of a partial cross-sectional structure of a slider of the present application;

[0028] Figure 12 Fig. 13 is a schematic diagram of a front view and a side view of the slider of the present application.

[0029] Fig. 1 is a schematic diagram of a partial cross-sectional structure of the present application; Fig. 2 is a schematic diagram of a structure of a threaded flat rod and an extension device in a folded corner state of the present application; Fig. 3 is a schematic diagram of a partial cross-sectional structure of the extension device of the present application; Fig. 4 is a schematic diagram of a partial cross-sectional structure of a screw rod of the present application; Fig. 5 is a schematic diagram of an enlarged structure at B of Fig. 4; Fig. 6 is a schematic diagram of a partial cross-sectional structure of an extension tube of the present application; Fig. 7 is a schematic diagram of a partial cross-sectional structure of a connecting rod of the present application; Fig. 8 is a schematic diagram of a partial cross-sectional structure of a rotating needle clamp of the present application; Fig. 9 is a schematic diagram of a partial cross-sectional structure of a threaded flat rod of the present application; Fig. 10 is a schematic diagram of a partial cross-sectional structure of a connecting head of the present application; Fig. 11 is a schematic diagram of a partial cross-sectional structure of an adjusting knob of the present application; Fig. 12 is a schematic diagram of a partial cross-sectional structure of a slider of the present application; Fig. 13 is a schematic diagram of a front view and a side view of the slider of the present application. Embodiment

[0030] The technical means, innovative features, purposes and effects achieved by the present application are easy to understand as follows.

[0031] The embodiments described herein are specific embodiments of the present application, used to illustrate the concept of the present application, and are explanatory and exemplary, and should not be interpreted as limiting the embodiments of the present application and the scope of the present application. In addition to the embodiments described herein, those skilled in the art can also employ other technical solutions based on the disclosure of the claims and the specification of the present application, which include technical solutions that make any obvious substitutions and modifications to the embodiments described herein.

[0032] The present application discloses a skull arc movement bone moving external fixation frame, as shown in Figure 1 and Figure 2 , comprising a threaded flat rod 1, an extension device 2 connected to one end of the threaded flat rod 1, two connecting rods 5 arranged at the mutually distant ends of the threaded flat rod 1 and the extension device 2, and four rotating needle clamps 6 arranged at both ends of the connecting rod 5, the threaded flat rod 1 is hinged to the extension device 2, the two connecting rods 5 are respectively fixedly connected to the threaded flat rod 1 and the extension device 2 perpendicularly, the rotating needle clamp 6 is coaxially rotationally connected to the connecting rod 5, the threaded flat rod 1 is a rod member with a threaded outer periphery and an elliptical cross section, the threaded flat rod 1 is provided with a sliding block 7, as shown in Figure 12 , the sliding block 7 is a flat rectangular block, the sliding block 7 is provided with a flat hole through slot 8, the sliding block 7 is sleeved on the threaded flat rod 1 and is in sliding connection with the threaded flat rod 1, the threaded flat rod 1 is provided with two advancing nuts 10, the two advancing nuts 10 are respectively arranged on both sides of the sliding block 7, the advancing nut 10 is in threaded connection with the threaded flat rod 1, so as to push the sliding block 7 to move and fix the position of the sliding block 7, the sliding block 7 is provided with a threaded hole 9 which is perpendicular to the opening direction of the flat hole through slot 8 and is in communication with the flat hole through slot 8, the threaded hole 9 is provided with a jackscrew 23, so as to further increase the stability of the sliding block 7 on the threaded flat rod 1.

[0033] As shown in Figure 3 and Figure 4 , the extension device 2 comprises a lead screw 201, a connecting head 202 arranged at the end of the lead screw 201, an adjusting knob 203 and an extension tube 204 arranged on the lead screw 201, as shown in Figure 10 , the connecting head 202 has a Y-shaped structure, comprising a U-shaped ear plate 2021 and a sleeve 2022, the inner wall of the sleeve 2022 and the outer periphery of the lead screw 201 are both provided with threads, the sleeve 2022 is sleeved on the end of the lead screw 201 and is in threaded connection with the lead screw 201, as shown in Figure 5As shown, the end of the screw rod 201 is provided with a slant hole 2001, the opening direction of the slant hole 2001 is 72° with the length direction of the screw rod 201, the sleeve 2022 is provided with an opening hole at both ends of the slant hole 2001, the slant hole 2001 is provided with a pin, the sleeve 2022 and the screw rod 201 are connected and fixed through the pin, the connection stability of the sleeve 2022 and the screw rod 201 is increased, as shown in Figure 3 and 11 As shown, the adjusting knob 203 includes a short tube one 2031 and a short tube two 2032 coaxially connected, the inner diameter of the short tube two 2032 is larger than that of the short tube one 2031, the short tube one 2031 is sleeved on the screw rod 201 and is threadedly connected with the screw rod 201, the short tube two 2032 is arranged in the direction away from the connector 202 of the short tube one 2031, the extension tube 204 is sleeved on the screw rod 201 and is slidingly connected with the screw rod 201, the outer diameter of the extension tube 204 is the same as the inner diameter of the short tube two 2032, one end of the extension tube 204 is inserted into the short tube two 2032, the extension tube 204 is coaxially and rotationally connected with the short tube two 2032, one end of the extension tube 204 inserted into the short tube two 2032 is provided with a ring-shaped groove one 4 surrounding the outer periphery of the extension tube 204, the inner wall of the short tube two 2032 is provided with a ring-shaped elastic gasket one 3 surrounding the inner wall of the short tube two 2032, the ring-shaped elastic gasket one 3 is clamped with the ring-shaped groove one 4; the end of the short tube one 2031 close to the short tube two 2032 is provided with a hole cavity, the hole cavity is provided with a compression spring 11, one end of the compression spring 11 away from the bottom of the hole cavity is provided with a steel ball 12, the end of the extension tube 204 inserted into the short tube two 2032 is provided with a plurality of arc-shaped grooves 13, each arc-shaped groove 13 can be opposite to the steel ball 12 by rotating the extension tube 204, the steel ball 12 is rollingly connected between the compression spring 11 and the extension tube 204, and between the steel ball 12 and the extension tube 204, by arranging the compression spring 11, the steel ball 12 and the arc-shaped grooves 13, when the extension tube 204 is rotated, the compression spring 11 gives the steel ball 12 a continuous ejection force, each time the steel ball 12 is rotated into the arc-shaped groove 13, there is an obvious jerk, which is convenient for the user to accurately control the length adjustment of the extension device 2, and plays a role of hand feel indexing, as shown in Figure 6 As shown, the extension tube 204 is provided with a strip-shaped display hole 14 along the length direction of the abdominal part, the extension tube 204 is provided with a scale line 15 on the side of the strip-shaped display hole 14 along the length direction, the screw rod 201 is provided with a pointer 16, the pointer 16 is slidingly connected with the extension tube 204 in the strip-shaped display hole 14.

[0034] As shown in Figure 9As shown, the threaded flat rod 1 is provided with a hinged rod 17 at one end, the cross-sectional specification of the hinged rod 17 is different from that of the threaded flat rod 1, the hinged rod 17 and the U-shaped ear plate 2021 are both provided with a hinged hole, the U-shaped ear plate 2021 is clamped on the hinged rod 17, and the hinged rod 17 and the U-shaped ear plate 2021 are connected by a pin that penetrates the U-shaped ear plate 2021 and the hinged rod 17, so that the threaded flat rod 1 and the extension device 2 are hinged through the connecting head 202, the threaded flat rod 1 can rotate around the end of the extension device 2 in a fan shape, the angle between the threaded flat rod 1 and the extension device 2 can be changed according to the skull curvature of the patient, which is more suitable for clinical use requirements, improves the accuracy, and the end of the threaded flat rod 1 away from the hinged rod 17 and the end of the extension tube 204 away from the connecting head 202 are both provided with a sleeve rod 18, the sleeve rod 18 is an elliptical rod, the cross-sectional specification of the sleeve rod 18 is different from that of the threaded flat rod 1 and the extension tube 204, as shown in the figure Figure 7 As shown, the connecting rod 5 is provided with a flat hole in the abdomen, the connecting rod 5 is sleeved on the sleeve rod 18, the connecting rod 5 is perpendicular to the threaded flat rod 1 and the extension tube 204 and is in an angle state, the connecting rod 5 and the sleeve rod 18 are both provided with a connecting hole, and the connecting rod 5 and the sleeve rod 18 are connected and fixed by a pin.

[0035] As shown in the figure Figure 8 As shown, the rotating needle clamp 6 is provided with a sleeve hole 19 at one end, the rotating needle clamp 6 is sleeved on the end of the connecting rod 5, the rotating needle clamp 6 is coaxially connected with the connecting rod 5, the end of the connecting rod 5 is provided with a ring-shaped groove two 20 around the outer periphery of the connecting rod 5, the inner wall of the sleeve hole 19 is provided with a ring-shaped elastic gasket two 25 around the inner wall of the sleeve hole 19, the ring-shaped elastic gasket two 25 is clamped with the ring-shaped groove two 20, the sliding block 7 is provided with a plurality of small holes one 21 for accommodating bone needles 24, the opening direction of the small holes one 21 is perpendicular to the plane where the threaded flat rod 1 and the connecting rod 5 are located, the sliding block 7 is provided with a top wire 23 hole that is perpendicular to the small holes one 21 and is connected with the small holes one 21, and the top wire 23 hole is provided with a top wire 23, so as to fix the bone needles 24 in the small holes one 21, the rotating needle clamp 6 is provided with small holes two 22, the opening direction of the small holes two 22 is perpendicular to the length direction of the connecting rod 5, the rotating needle clamp 6 is provided with a top wire 23 hole that is perpendicular to the small holes two 22 and is connected with the small holes two 22, and the top wire 23 hole is provided with a top wire 23, so as to fix the bone needles 24 in the small holes two 22.

[0036] In use, the position of the sliding block 7 is adjusted by rotating the thrust nut 10 according to the skull condition of the patient, the sliding block 7 is fixed by the top wire 23 in the threaded hole 9 after the sliding block 7 reaches the appropriate position, the angle between the threaded flat rod 1 and the extension device 2 is changed according to the skull curvature of the patient, which is more suitable for clinical use requirements, then the extension tube 204 is driven by the adjusting knob 203 to slide along the lead screw 201, so as to adjust the length of the extension device 2 according to the indication of the pointer 16 and the scale line 15.

[0037] The application establishes an effective skull arc movement bone moving external fixation frame frame by setting the threaded flat rod, the extension device, the connecting rod, the rotating needle clamp and the sliding block, and through the movable sliding block and the length-adjustable extension device, the bone needle installed on the sliding block can be adjusted and moved according to the required arc trajectory at any time, the angle between the threaded flat rod and the extension device is changed according to the skull arc of the patient, so that the use requirements of patients with various skull arcs are met, the length and angle of the skull free bone block in the arc direction are accurately positioned, the clinical use requirements are better met, the precision is improved, the structure is simple and the adjustment is convenient; the compression spring, the steel ball and the arc-shaped groove are arranged in the extension device, when the extension pipe is rotated, the compression spring gives the steel ball a continuous ejection force, and each time the steel ball is rotated into the arc-shaped groove, there is obvious jerk feeling, so that the user can accurately master the length adjustment of the extension device.

[0038] The above only describes the preferred embodiments of the application and is not intended to limit the application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. A cranial arc-motion bone transport external fixator, characterized in that: The device includes a threaded flat bar (1), an extension device (2) connected to one end of the threaded flat bar (1), a connecting rod (5) located at the ends of the threaded flat bar (1) and the extension device (2) that are far apart from each other, and rotating needle clamps (6) located at both ends of the connecting rod (5). The threaded flat bar (1) is hinged to the extension device (2), and the two connecting rods (5) are fixedly connected to the threaded flat bar (1) and the extension device (2) respectively. Both connecting rods (5) are perpendicular to the plane where the threaded flat bar (1) and the extension device (2) are located when they are bent at an angle. The rotating needle clamps (6) are coaxially rotatably connected to the connecting rods (5). The threaded flat bar (1) is provided with a slider (7), and the slider (7) is provided with a flat hole through groove (8). The slider (7) is sleeved on the threaded flat bar (1) and slidably connected to the threaded flat bar (1). The threaded flat bar (1) is provided with two push nuts (10), which are respectively located on both sides of the slider (7). The push nuts (10) are threadedly connected to the threaded flat bar (1). The extension device (2) includes a lead screw (201), a connector (202) located at one end of the lead screw (201), an adjustment knob (203) and an extension tube (204) located on the lead screw (201). The adjustment knob (203) is located between the connector (202) and the extension tube (204). The lead screw (201) is fixedly connected to the connector (202), the adjustment knob (203) is threadedly connected to the lead screw (201), the extension tube (204) is slidably connected to the lead screw (201), and the extension tube (204) is coaxially rotatably connected to the adjustment knob (203).

2. The external fixator for cranial arc movement bone transport according to claim 1, characterized in that: The adjusting knob (203) includes a short tube one (2031) and a short tube two (2032) coaxially connected. The inner diameter of the short tube two (2032) is larger than the inner diameter of the short tube one (2031). The short tube one (2031) is sleeved on the lead screw (201) and threadedly connected to the lead screw (201). The short tube two (2032) is positioned away from the connector (202) of the short tube one (2031). The outer diameter of the extension tube (204) is the same as that of the short tube two (2031). The inner diameters of the two tubes are the same. One end of the extension tube (204) is inserted into the short tube (2032). The extension tube (204) and the short tube (2032) are coaxially rotatably connected. The end of the extension tube (204) inserted into the short tube (2032) is provided with an annular groove (4) around the outer periphery. An annular elastic gasket (3) around the inner wall of the short tube (2032) is provided. The annular elastic gasket (3) is engaged with the annular groove (4).

3. The external fixator for cranial arc movement bone transport according to claim 2, characterized in that: The short tube one (2031) has an inwardly formed cavity at the end near the short tube two (2032), and a compression spring (11) is provided in the cavity. A steel ball (12) is provided at the end of the compression spring (11) away from the bottom of the cavity. The end of the extension tube (204) inserted into the short tube two (2032) has multiple arc-shaped grooves (13). The steel ball (12) is in rolling connection with the compression spring (11) and with the extension tube (204).

4. The external fixator for cranial arc movement bone transport according to claim 3, characterized in that: The extension tube (204) has a strip-shaped display hole (14) along its length. A scale line (15) is provided on the extension tube (204) along the extension direction on one side of the strip-shaped display hole (14). A pointer (16) is provided on the lead screw (201). The pointer (16) is slidably connected to the extension tube (204) inside the strip-shaped display hole (14).

5. The external fixator for cranial arc movement bone transport according to claim 1, characterized in that: The connector (202) has a Y-shaped structure, including a U-shaped ear plate (2021) and a sleeve (2022). The sleeve (2022) is fitted onto the end of the lead screw (201). The end of the lead screw (201) has an oblique hole (2001). The opening direction of the oblique hole (2001) makes an angle of 72° with the length direction of the lead screw (201). The sleeve (2022) has corresponding openings at both ends of the oblique hole (2001). The oblique hole (2001) has a pin that passes through the sleeve (2022) and the lead screw (201). The sleeve (2022) and the lead screw (201) are connected and fixed by the pin.

6. The external fixator for cranial arc movement bone transport according to claim 5, characterized in that: The threaded flat bar (1) has a hinge rod (17) at one end. Both the hinge rod (17) and the U-shaped ear plate (2021) have hinge holes. The U-shaped ear plate (2021) is clamped on the hinge rod (17) and hinged to the hinge rod (17) by a pin.

7. The external fixator for cranial arc movement bone transport according to claim 6, characterized in that: The threaded flat bar (1) is provided with a sleeve rod (18) at the end away from the hinge rod (17) and the extension tube (204) is provided with a sleeve rod (18) at the end away from the connector (202). The sleeve rod (18) is a rod with an elliptical cross-section. The connecting rod (5) has a flat hole on its belly. The connecting rod (5) is sleeved on the sleeve rod (18). Both the connecting rod (5) and the sleeve rod (18) have connecting holes. The connecting rod (5) and the sleeve rod (18) are connected and fixed by a pin.

8. The external fixator for cranial arc movement bone transport according to claim 1, characterized in that: The rotating needle clamp (6) has a sleeve hole (19) at one end. The rotating needle clamp (6) is sleeved on the end of the connecting rod (5). The end of the connecting rod (5) has an annular groove (20) around the outer periphery. An annular elastic pad (25) around the inner wall of the sleeve hole (19) is provided. The annular elastic pad (25) is engaged with the annular groove (20).

9. The external fixator for cranial arc movement bone transport according to claim 1, characterized in that: The slider (7) is provided with a plurality of small holes (21) for accommodating bone needles (24). The opening direction of the small holes (21) is perpendicular to the plane in which the threaded flat bar (1) and the connecting rod (5) are located. The rotating needle clamp (6) is provided with small holes (22). The opening direction of the small holes (22) is perpendicular to the length direction of the connecting rod (5). Both the slider (7) and the rotating needle clamp (6) are provided with set screws (23). The set screws (23) on the slider (7) are perpendicular to the small holes (21) and pass through the small holes (21). The set screws (23) on the rotating needle clamp (6) are perpendicular to the small holes (22) and pass through the small holes (22).

10. A cranial arc-motion bone transport external fixator according to any one of claims 1 to 9, characterized in that: The slider (7) is provided with a threaded hole (9) that is perpendicular to the opening direction of the flat hole through groove (8) and communicates with the flat hole through groove (8). A set screw (23) is provided in the threaded hole (9).

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