A three-point calcaneal distraction device

Abstract

The present invention discloses a calcaneal three-point distraction device, including three fixing pins, two adjacent fixing pins are connected by a sleeve plate with a square cross section and a telescopic plate inserted into the sleeve plate, and the sleeve plate and the telescopic plate are respectively connected to the fixing pins in rotation, the sleeve plate is in a circular arc shape with a convex middle part to increase the surgical exposure area of ​​the middle part, and a closed hydraulic cavity is formed between the inner end of the telescopic plate and the inner end of the sleeve plate. Sterile water can be filled here, which is more hygienic. The telescopic plate and the sleeve plate can both be made of stainless steel for easy disinfection, and can also be made of X-ray-proof materials, such as carbon materials, to avoid shooting obstruction. Two sets of sleeve plates and telescopic plates are set here, which is equivalent to forming a "C" shape. Of course, if necessary, it can also be set in a ring shape. It also includes a piston cylinder connected to the hydraulic cavity and a piston mechanism installed in the piston cylinder and threadedly propelled, and the piston cylinder is close to the sleeve plate and away from the telescopic plate.

Description

Technical Field

[0001] The invention relates to the field of calcaneal three-point distraction, in particular to a calcaneal three-point distraction device. Background Art

[0002] For patients with calcaneal fractures, Kirschner wire distraction is generally used during surgery for better fracture reduction. The traditional two-point distraction is not effective. Currently, the three-point distraction uses three Kirschner wires, and distractors are set between the Kirschner wires. The current distractor forms a triangular structure between the three Kirschner wires. This distraction can be rotated by a threaded rod, which has great force and is easy to adjust. A bidirectional threaded rod can be used, and the connection between the two Kirschner wires is a linear type, such as Figure 1 As shown, the threaded transmission has great force, good effect and high precision. However, the disadvantage of this threaded transmission is also obvious, that is, the operating space in the middle is small. Therefore, there is an arc type, such as the patent with announcement number CN211633409U, Figure 2 This connecting part protrudes outward to avoid, thereby increasing the exposed operating space in the middle, which is more conducive to surgery. However, this arc-type expansion also has disadvantages. It cannot be expanded using a threaded expansion and needs to be expanded manually, which is laborious. Moreover, the accuracy is difficult to control. Therefore, how to expose a larger area in the operating space while facilitating adjustment is an urgent problem that technicians in this field need to solve. Summary of the invention

[0003] The purpose of the present invention is to provide a calcaneal three-point distraction device to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a three-point distraction device for the calcaneus, comprising three fixing pins, the fixing pins are Kirschner wires or Steinmann wires, two adjacent fixing pins are connected by a sleeve plate with a square cross-section and a telescopic plate inserted into the sleeve plate, and the sleeve plate and the telescopic plate are respectively rotatably connected to the fixing pins, the sleeve plate is in an arc shape with a convex middle part to increase the surgical exposure area in the middle part, and a closed hydraulic cavity is formed between the inner end of the telescopic plate and the inner end of the sleeve plate. Sterile water can be filled here, which is more hygienic. The telescopic plate and the sleeve plate can both be made of stainless steel for easy disinfection, and can also be made of X-ray-proof materials, such as carbon materials, to avoid obstruction during shooting. Two sets of sleeve plates and telescopic plates are set here, which is equivalent to forming a "C" shape. Of course, if necessary, it can also be set in a ring shape.

[0005] It also includes a piston cylinder connected to the hydraulic chamber and a piston mechanism installed in the piston cylinder and pushed forward in a threaded manner, and the piston cylinder is close to the end of the sleeve plate away from the telescopic plate. The piston cylinder faces outward for easy operation, and the side close to the fixed needle ensures smooth injection of liquid without being blocked by the telescopic plate.

[0006] Preferably, the piston mechanism includes a piston plate installed in the piston cylinder, and the piston plate is rotatably connected to a threaded rod extending outward from the piston cylinder, the end of the threaded rod is provided with a rotary handle for easy rotation, and the threaded rod is threadedly connected to the bottom of the piston cylinder, and the bottom of the piston cylinder is provided with an air hole. The air hole is used for ventilation to maintain pressure balance. A threaded type is used here. Compared with direct hand pushing, this threaded type has a large transmission force, is more stable, has high adjustment accuracy, and is also easy to operate.

[0007] Preferably, the piston cylinder is detachably connected with a cylinder cover, and the threaded rod is threadedly connected to the cylinder cover, and the vent hole is provided on the cylinder cover. The cylinder cover can be threadedly fixed on the piston cylinder, or in other forms, mainly for the convenience of opening and maintaining the inside of the piston cylinder.

[0008] Preferably, the inner end of the telescopic plate is connected with a sealing pad to increase the sealing performance. To increase the sealing performance, the inner cavity corner of the sleeve plate can be arc-shaped for easy sealing.

[0009] Preferably, the invention further comprises an angle adjustment mechanism disposed between the sleeve plate and the fixing needle to adjust the angle of the fixing needle.

[0010] Preferably, the angle adjustment mechanism comprises a spherical shell with openings at both the upper and lower ends fixed to the end of the sleeve plate and a universal ball located in the spherical shell, the universal ball is provided with a through hole for the fixing needle to be inserted, and the outer end of the spherical shell is threadedly connected with a first tightening knob whose inner end is pressed against the universal ball, the outer end of the jack is fixed with a guide tube for the fixing needle to be inserted, and the guide tube is threadedly connected with a second tightening knob whose inner end is pressed against the fixing needle, and the sleeve plate and the telescopic plate are rotatably mounted on the spherical shell respectively. The universal ball can rotate around the spherical shell, and the angle can be adjusted by tightening the first tightening knob. The size of the jack can be larger to facilitate the insertion of fixing needles of different thicknesses. It should be noted that the second tightening knob here can be provided in two sets, upper and lower, to increase the stability of the fixation.

[0011] Preferably, the spherical shell is provided with a protrusion, and the sleeve plate and the telescopic plate are rotatably connected to the spherical shell by bolts. Two protrusions are provided, one on the upper and one on the lower, and two groups are provided on each spherical shell, with a total of four protrusions. The sleeve plate or the telescopic plate is installed between the two upper and lower protrusions. The middle part of the bolt is not provided with a thread, and the end is tightened and fixed by a nut. The setting of the bolt is firstly convenient for disassembly and installation, and secondly, two fixing pins or three fixing pins can be selected according to needs, which can be disassembled and used more flexibly.

[0012] Preferably, a synchronization mechanism is provided between two adjacent fixing pins and is located at the lower side of the foot, and the synchronization mechanism is respectively connected to the sleeve plate and the telescopic plate so that the lower side of the fixing pin opens synchronously with the upper side. The synchronization mechanism is mainly to facilitate the synchronous opening of the lower side of the fixing pin, and the upper and lower sides are fixed, which has better stability.

[0013] Preferably, the synchronization mechanism includes a guide sleeve arranged between two adjacent fixed needles and a guide plate inserted in the guide sleeve, the guide sleeve is in the shape of an arc parallel to the sleeve plate, and the guide sleeve and the guide plate are respectively rotatably connected to the fixed needles, the sleeve plate and the guide sleeve as well as the telescopic plate and the guide plate are respectively connected by connecting rods to achieve synchronous telescoping.

[0014] Preferably, a ball shell, a universal ball, a first fastening knob, a guide tube, a second fastening knob and a bolt are also arranged between the fixing needle, the guide sleeve and the guide plate to achieve angle adjustment of the guide sleeve and the guide plate on the fixing needle. The connection between the ball shell, the universal ball, the first fastening knob, the guide tube, the second fastening knob and the bolt is the same as that of the upper side, and the lower side angle is adjusted to ensure synchronization while taking into account the lower side angle fine adjustment.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. When the distance between the fixed needles needs to be adjusted, the rotary handle is turned. The rotary handle drives the piston plate to move through the threaded rod. By injecting liquid into the piston cylinder or extracting liquid, the telescopic plate can be extended and retracted in the sleeve plate to achieve expansion. Threaded transmission is adopted here, which has strong force, high precision and good control. At the same time, the sleeve plate and the telescopic plate are both arc-shaped with a large exposed area, which is convenient for surgical operation. In this way, the strong transmission force of the thread and the large exposed area of ​​the arc-shaped sleeve plate are combined. Through hydraulic pressure, the combination of the two is realized, and the thread transmission and the exposed area are increased. At the same time, it overcomes the traditional form that the thread can only be transmitted in a straight line;

[0017] 2. The connection between the guide sleeve, the guide plate and the connecting rod enables the lower side of the fixed needle to be opened synchronously. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the first prior art structure;

[0019] Figure 2 It is a schematic diagram of the second prior art structure;

[0020] Figure 3 It is a front view of the first embodiment of the present invention;

[0021] Figure 4 is a top view of a first embodiment of the present invention;

[0022] Figure 5 is an isometric view of a first embodiment of the present invention;

[0023] Figure 6 is an isometric view of a first embodiment of the present invention;

[0024] Figure 7 It is an exploded view of the second embodiment of the present invention.

[0025] Figures 3 to 7 In: 1. Fixed needle; 2. Sleeve plate; 3. Telescopic plate; 4. Piston cylinder; 5. Piston plate; 6. Threaded rod; 7. Cylinder cover; 8. Sealing gasket; 9. Ball shell; 10. Universal ball; 11. First tightening knob; 12. Guide tube; 13. Second tightening knob; 14. Bolt; 15. Guide sleeve; 16. Guide plate; 17. Connecting rod. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0027] Example 1

[0028] See also Figures 3 to 6 The present invention provides a technical solution for a three-point distraction device for the calcaneus: a three-point distraction device for the calcaneus, comprising three fixing pins 1, the fixing pins 1 being Kirschner wires or Steinmann wires, two adjacent fixing pins 1 being connected by a sleeve plate 2 having a square cross-section and a telescopic plate 3 inserted into the sleeve plate 2, and the sleeve plate 2 and the telescopic plate 3 are respectively rotatably connected to the fixing pins 1, the sleeve plate 2 is in an arc shape with a convex middle part to increase the surgical exposure area in the middle part, and a closed hydraulic cavity is formed between the inner end of the telescopic plate 3 and the inner end of the sleeve plate 2. Sterile water can be filled here, which is more hygienic. Both the telescopic plate 3 and the sleeve plate 2 can be made of stainless steel for easy disinfection, or can be made of an X-ray-proof material, such as carbon material, to avoid obstruction during shooting. Two sets of sleeve plates 2 and telescopic plates 3 are set here, which is equivalent to forming a "C" shape. Of course, if necessary, it can also be set in a ring shape.

[0029] It also includes a piston cylinder 4 connected to the hydraulic chamber and a piston mechanism installed in the piston cylinder 4 and threadedly pushed, and the piston cylinder 4 is close to the end of the sleeve plate 2 away from the telescopic plate 3. The piston cylinder 4 faces outward for easy operation, close to the side of the fixed needle 1, to ensure smooth injection of liquid without being blocked by the telescopic plate 3.

[0030] The piston mechanism includes a piston plate 5 installed in the piston cylinder 4, and the piston plate 5 is rotatably connected with a threaded rod 6 extending outward from the piston cylinder 4, the end of the threaded rod 6 is provided with a handle for convenient rotation, and the threaded rod 6 is threadedly connected to the bottom of the piston cylinder 4, and the bottom of the piston cylinder 4 is provided with a vent. The vent is used for ventilation to maintain pressure balance. A threaded type is adopted here. Compared with direct hand pushing, this threaded type has a large transmission force, is more stable, has high adjustment accuracy, and is also easy to operate. The piston cylinder 4 is detachably connected with a cylinder cover 7, and the threaded rod 6 is threadedly connected to the cylinder cover 7, and the vent is opened on the cylinder cover 7. The cylinder cover 7 can be threadedly fixed on the piston cylinder 4, or it can be in other forms, mainly for the convenience of opening and maintaining the inside of the piston cylinder 4. The inner end of the telescopic plate 3 is connected with a sealing pad 8 to increase the sealing performance. To increase the sealing performance, the inner cavity corner of the sleeve plate 2 can be arc-transitioned for easy sealing, and the sealing pad 8 can be a high-temperature resistant latex pad or rubber pad.

[0031] It also includes an angle adjustment mechanism arranged between the sleeve plate 2 and the fixed needle 1. Adjust the angle of the fixed needle 1. The angle adjustment mechanism includes a ball shell 9 with openings at both the upper and lower ends fixed to the end of the sleeve plate 2 and a universal ball 10 located in the ball shell 9. The universal ball 10 is provided with a through jack for the fixed needle 1 to be inserted, and the outer end of the ball shell 9 is threadedly connected with a first tightening knob 11 whose inner end is pressed against the universal ball 10, and the outer end of the jack is fixed with a guide tube 12 for the fixed needle 1 to be inserted, and the guide tube 12 is threadedly connected with a second tightening knob 13 whose inner end is pressed against the fixed needle 1, and the sleeve plate 2 and the telescopic plate 3 are rotatably mounted on the ball shell 9 respectively. The universal ball 10 can rotate around the ball shell 9, and the angle can be adjusted by tightening the first tightening knob 11. The size of the jack can be larger to facilitate the insertion of fixed needles 1 of different thicknesses. It should be noted that the second tightening knob 13 here can be set in two groups, upper and lower, to increase the stability of the fixation.

[0032] The ball shell 9 is provided with a bump, and the sleeve plate 2 and the telescopic plate 3 are rotatably connected to the ball shell 9 by bolts 14. Two bumps are provided, one on the top and one on the bottom. Two groups of bumps are provided on each ball shell 9, with a total of four bumps. The sleeve plate 2 or the telescopic plate 3 is installed between the two bumps. The middle of the bolt 14 is not provided with a thread, and the end is tightened and fixed by a nut. The setting of the bolt 14 is firstly convenient for disassembly and installation, and secondly, two fixing pins 1 or three fixing pins 1 can be selected according to needs, which can be disassembled and used more flexibly.

[0033] Example 2

[0034] See also Figure 7The present invention provides a technical solution for a three-point distraction device for the calcaneus: a three-point distraction device for the calcaneus, comprising three fixing pins 1, the fixing pins being Kirschner wires or Steinmann wires, two adjacent fixing pins 1 being connected by a sleeve plate 2 having a square cross-section and a telescopic plate 3 inserted into the sleeve plate 2, and the sleeve plate 2 and the telescopic plate 3 are respectively rotatably connected to the fixing pins 1, the sleeve plate 2 is in an arc shape with a convex middle part to increase the surgical exposure area in the middle part, and a closed hydraulic cavity is formed between the inner end of the telescopic plate 3 and the inner end of the sleeve plate 2. Sterile water can be filled here, which is more hygienic. Both the telescopic plate 3 and the sleeve plate 2 can be made of stainless steel for easy disinfection, or can be made of an X-ray-proof material, such as carbon material, to avoid obstruction during shooting. Two sets of sleeve plates 2 and telescopic plates 3 are set here, which is equivalent to forming a "C" shape. Of course, if necessary, it can also be set in a ring shape.

[0035] It also includes a piston cylinder 4 connected to the hydraulic chamber and a piston mechanism installed in the piston cylinder 4 and threadedly pushed, and the piston cylinder 4 is close to the end of the sleeve plate 2 away from the telescopic plate 3. The piston cylinder 4 faces outward for easy operation, close to the side of the fixed needle 1, to ensure smooth injection of liquid without being blocked by the telescopic plate 3.

[0036] The piston mechanism includes a piston plate 5 installed in the piston cylinder 4, and the piston plate 5 is rotatably connected with a threaded rod 6 extending outward from the piston cylinder 4, the end of the threaded rod 6 is provided with a handle for convenient rotation, and the threaded rod 6 is threadedly connected to the bottom of the piston cylinder 4, and the bottom of the piston cylinder 4 is provided with a vent. The vent is used for ventilation to maintain pressure balance. A threaded type is adopted here. Compared with direct hand pushing, this threaded type has a large transmission force, is more stable, has high adjustment accuracy, and is also easy to operate. The piston cylinder 4 is detachably connected with a cylinder cover 7, and the threaded rod 6 is threadedly connected to the cylinder cover 7, and the vent is opened on the cylinder cover 7. The cylinder cover 7 can be threadedly fixed on the piston cylinder 4, or it can be in other forms, mainly for the convenience of opening and maintaining the inside of the piston cylinder 4. The inner end of the telescopic plate 3 is connected with a sealing pad 8 to increase the sealing performance. To increase the sealing performance, the inner cavity corner of the sleeve plate 2 can be arc-transitioned for easy sealing, and the sealing pad 8 can be a high-temperature resistant latex pad or rubber pad.

[0037] It also includes an angle adjustment mechanism arranged between the sleeve plate 2 and the fixed needle 1. Adjust the angle of the fixed needle 1. The angle adjustment mechanism includes a ball shell 9 with openings at both the upper and lower ends fixed to the end of the sleeve plate 2 and a universal ball 10 located in the ball shell 9. The universal ball 10 is provided with a through jack for the fixed needle 1 to be inserted, and the outer end of the ball shell 9 is threadedly connected with a first tightening knob 11 whose inner end is pressed against the universal ball 10, and the outer end of the jack is fixed with a guide tube 12 for the fixed needle 1 to be inserted, and the guide tube 12 is threadedly connected with a second tightening knob 13 whose inner end is pressed against the fixed needle 1, and the sleeve plate 2 and the telescopic plate 3 are rotatably mounted on the ball shell 9 respectively. The universal ball 10 can rotate around the ball shell 9, and the angle can be adjusted by tightening the first tightening knob 11. The size of the jack can be larger to facilitate the insertion of fixed needles 1 of different thicknesses. It should be noted that the second tightening knob 13 here can be set in two groups, upper and lower, to increase the stability of the fixation.

[0038] The ball shell 9 is provided with a bump, and the sleeve plate 2 and the telescopic plate 3 are rotatably connected to the ball shell 9 by bolts 14. Two bumps are provided, one on the top and one on the bottom. Two groups of bumps are provided on each ball shell 9, with a total of four bumps. The sleeve plate 2 or the telescopic plate 3 is installed between the two bumps. The middle of the bolt 14 is not provided with a thread, and the end is tightened and fixed by a nut. The setting of the bolt 14 is firstly convenient for disassembly and installation, and secondly, two fixing pins 1 or three fixing pins 1 can be selected according to needs, which can be disassembled and used more flexibly.

[0039] A synchronization mechanism located at the lower side of the foot is provided between two adjacent fixed needles 1, and the synchronization mechanism is respectively connected to the sleeve plate 2 and the telescopic plate 3 so that the lower side of the fixed needle opens synchronously with the upper side. The synchronization mechanism is mainly to facilitate the synchronous opening of the lower side of the fixed needle by applying force, and the upper and lower sides are fixed, so the stability is better. The synchronization mechanism includes a guide sleeve 15 provided between two adjacent fixed needles and a guide plate 16 inserted into the guide sleeve 15. The guide sleeve 15 is in an arc shape parallel to the sleeve plate 2, and the guide sleeve 15 and the guide plate 16 are respectively rotatably connected to the fixed needle 1. The sleeve plate 2 and the guide sleeve 15, as well as the telescopic plate 3 and the guide plate 16 are respectively connected by connecting rods 17 to achieve synchronous telescoping.

[0040] The ball shell 9, universal ball 10, first fastening knob 11, guide tube 12, second fastening knob 13 and bolt 14 are also arranged between the fixed needle 1, the guide sleeve 15 and the guide plate 16 to achieve the angle adjustment of the guide sleeve 15 and the guide plate 16 on the fixed needle 1. The connection between the ball shell 9, universal ball 10, first fastening knob 11, guide tube 12, second fastening knob 13 and bolt 14 is the same as that of the upper side, and the lower side angle adjustment is performed to ensure synchronization while taking into account the lower side angle fine adjustment.

[0041] The thickness of the connecting end of the telescopic plate 3 and the bolt 14 is increased to ensure that it fits the upper and lower side protrusions. The bolt 14 serves as a rotation center and an anti-slipping function. At the same time, when the bolt 14 and the nut are further tightened, the sleeve plate 2 and the telescopic plate 3 can be clamped to play a fixing role. In other words, the bolt 14 can at least achieve three functions: rotational anti-slipping, fixed clamping, and detachable.

[0042] Working principle: when the distance between the fixed needles 1 needs to be adjusted, turn the rotary handle, which drives the piston plate 5 to move through the threaded rod 6, and by injecting liquid into the piston cylinder 4, or extracting liquid, the telescopic plate 3 is telescoped in the sleeve plate 2 to achieve the expansion. Threaded transmission is adopted here, which has strong force, high precision and good control. At the same time, the sleeve plate 2 and the telescopic plate 3 are both arc-shaped, with a large exposed area, which is convenient for surgical operation. In this way, the strong transmission force of the thread and the large exposed area of ​​the arc-shaped sleeve plate 2 are combined through hydraulic pressure, and the combination of the two is achieved. The thread transmission and the exposed area are increased, and both are taken into account at the same time, overcoming the traditional form that the thread can only transmit in a straight line. The connection of the guide sleeve 15, the guide plate 16 and the connecting rod 17 realizes the synchronous opening of the lower side of the fixed needle 1.

[0043] Although 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 appended claims and their equivalents.

Claims

1. A calcaneal three-point distraction device, comprising three fixing pins (1), wherein two adjacent fixing pins (1) are connected by a sleeve plate (2) having a square cross section and a telescopic plate (3) inserted into the sleeve plate (2) and adapted thereto, and the sleeve plate (2) and the telescopic plate (3) are respectively rotatably connected to the fixing pins (1), characterized in that: The sleeve plate (2) is in the shape of an arc with a convex middle portion so as to increase the surgical exposure area of ​​the middle portion, and a closed hydraulic cavity is formed between the inner end of the telescopic plate (3) and the inner end of the sleeve plate (2); It also includes a piston cylinder (4) connected to the hydraulic chamber and a piston mechanism installed in the piston cylinder (4) and pushed forward in a threaded manner, and the piston cylinder (4) is close to one end of the sleeve plate (2) away from the telescopic plate (3).

2. A calcaneal three-point distraction device according to claim 1, characterized in that: The piston mechanism comprises a piston plate (5) installed in a piston cylinder (4), and the piston plate (5) is rotatably connected to a threaded rod (6) extending outward from the piston cylinder (4), and a handle for convenient rotation is provided at the end of the threaded rod (6), and the threaded rod (6) is threadedly connected to the bottom of the piston cylinder (4), and the bottom of the piston cylinder (4) is provided with an air vent.

3. The calcaneal three-point distraction device according to claim 2, characterized in that: The piston cylinder (4) is detachably connected to a cylinder cover (7), and the threaded rod (6) is threadedly connected to the cylinder cover (7), and the air vent is provided on the cylinder cover (7).

4. The calcaneal three-point distraction device according to claim 3, characterized in that: The inner end of the telescopic plate (3) is connected to a sealing pad (8) for improving sealing performance.

5. The calcaneal three-point distraction device according to claim 1, characterized in that: It also includes an angle adjustment mechanism arranged between the sleeve plate (2) and the fixing needle (1).

6. The calcaneal three-point distraction device according to claim 5, characterized in that: The angle adjustment mechanism comprises a spherical shell (9) fixed at the end of the sleeve plate (2) and having openings at both the upper and lower ends, and a universal ball (10) located in the spherical shell (9); a through insertion hole for inserting the fixing needle (1) is provided on the universal ball (10); the outer end of the spherical shell (9) is threadedly connected to a first tightening knob (11) whose inner end abuts against the universal ball (10); a guide tube (12) for inserting the fixing needle (1) is fixed at the outer end of the insertion hole; and a second tightening knob (13) whose inner end abuts against the fixing needle (1) is threadedly connected to the guide tube (12); the sleeve plate (2) and the telescopic plate (3) are rotatably mounted on the spherical shell (9) respectively.

7. The calcaneal three-point distraction device according to claim 6, characterized in that: The spherical shell (9) is provided with a convex block, and the sleeve plate (2) and the telescopic plate (3) are rotatably connected to the spherical shell (9) via bolts (14) respectively.

8. The calcaneal three-point distraction device according to claim 7, characterized in that: A synchronization mechanism located at the lower side of the foot is provided between two adjacent fixing needles (1), and the synchronization mechanism is respectively connected to the sleeve plate (2) and the telescopic plate (3) so that the lower side of the fixing needle opens synchronously with the upper side.

9. The calcaneal three-point distraction device according to claim 8, characterized in that: The synchronization mechanism comprises a guide sleeve (15) arranged between two adjacent fixed needles and a guide plate (16) inserted into the guide sleeve (15); the guide sleeve (15) is in an arc shape parallel to the sleeve plate (2); the guide sleeve (15) and the guide plate (16) are respectively rotatably connected to the fixed needle (1); the sleeve plate (2) and the guide sleeve (15) and the telescopic plate (3) and the guide plate (16) are respectively connected by connecting rods (17) to achieve synchronous telescoping.

10. The calcaneal three-point distraction device according to claim 9, characterized in that: A ball shell (9), a universal ball (10), a first tightening knob (11), a guide tube (12), a second tightening knob (13) and a bolt (14) are also arranged between the fixing needle (1), the guide sleeve (15) and the guide plate (16) to achieve angle adjustment of the guide sleeve (15) and the guide plate (16) on the fixing needle (1).

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