Minimally invasive surgical distraction device and minimally invasive surgical distraction system

Abstract

The present invention relates to a minimally invasive surgery distraction device and a minimally invasive surgery distraction system, which solves the technical problems that the existing minimally invasive spinal surgery distraction device is difficult to operate, the distraction angle is fixed and cannot be freely adjusted; the distraction action is not stable enough, and it is easy to cause damage to muscle tissue. The distraction device includes a distraction cylinder assembly, a support frame, a base, a threaded drive rod jacket, a light source interface component, and a threaded drive rod. The distraction cylinder assembly includes a left distraction semi-cylinder and a right distraction semi-cylinder, the top of the left distraction semi-cylinder is rotatably connected to the base through a first rotating shaft, the top of the right distraction semi-cylinder is rotatably connected to the base through a second rotating shaft, the threaded drive rod jacket is connected to the base, the threaded drive rod is connected and matched with the threaded drive rod jacket, and the top of the threaded drive rod is connected with a screw; the bottom of the threaded drive rod is connected to the left distraction semi-cylinder through a first transmission connecting rod, and the bottom of the threaded drive rod is connected to the right distraction semi-cylinder through a second transmission connecting rod. The present invention is widely used in the field of medical device technology.

Description

Technical Field

[0001] The present invention relates to the technical field of minimally invasive spinal surgery, and in particular to a minimally invasive surgery distraction device and a minimally invasive surgery distraction system. Background Art

[0002] In the field of minimally invasive spinal surgery, minimally invasive spinal surgery has the advantages of small incision, less trauma, and quick recovery, and is the development trend of spinal surgery. For surgeries that only require single-segment vertebral screw and rod placement and simple intervertebral disc decompression, only a small channel is needed to open the surgical field of view and perform surgical operations.

[0003] The invention patent application with publication number CN110384526A discloses a minimally invasive surgical distraction device and distractor. However, the distraction device is difficult to operate, the distraction angle is fixed and cannot be freely adjusted; the distraction action is not stable enough and easily causes damage to muscle tissue. Summary of the invention

[0004] The present invention is to solve the technical problems that the existing spinal minimally invasive surgical distraction devices are difficult to operate, the distraction angle is fixed and cannot be freely adjusted, and the distraction action is not smooth enough, which easily causes damage to muscle tissue. The present invention provides a minimally invasive surgical distraction device and a minimally invasive surgical distraction system that are easy to operate, have a freely adjustable distraction angle, and a smooth and reliable distraction action.

[0005] The present invention provides a minimally invasive surgical expansion device, comprising an expansion cylinder assembly, a support frame, a base, a threaded drive rod sleeve, a light source interface component, a threaded drive rod, a first transmission connecting rod and a second transmission connecting rod. The support frame is connected to the base, and the light source interface component is connected to the base. The expansion cylinder assembly comprises a left expansion semi-cylinder and a right expansion semi-cylinder. The top of the left expansion semi-cylinder is connected with a first rotating shaft, which is rotatably connected to the base, and the top of the right expansion semi-cylinder is connected with a second rotating shaft, which is rotatably connected to the base. The threaded drive rod sleeve is connected to the base, the threaded drive rod sleeve is provided with an internal thread, and the threaded drive rod is provided with an external thread. The external thread of the threaded drive rod is matched with the internal thread of the threaded drive rod sleeve, and the top of the threaded drive rod is connected with a screw; the upper end of the first transmission connecting rod is hinged to the bottom of the threaded drive rod, the lower end of the first transmission connecting rod is hinged to the left expansion semi-cylinder, the upper end of the second transmission connecting rod is hinged to the bottom of the threaded drive rod, and the lower end of the second transmission connecting rod is hinged to the right expansion semi-cylinder.

[0006] Preferably, a first opening angle limiting groove is provided on the top of the left opened semi-cylinder 11, and a second opening angle limiting groove is provided on the top of the right opened semi-cylinder. A first limiting column and a second limiting column are connected to the base, and the first limiting column passes through the first opening angle limiting groove, and the second limiting column passes through the second opening angle limiting groove.

[0007] Preferably, the expansion cylinder assembly is made of an X-ray transparent material.

[0008] Preferably, the X-ray transparent material is a carbon fiber material or a PEEK material.

[0009] Preferably, the light source interface component is provided with three light source connecting inclined holes for installing the light source.

[0010] Preferably, an anti-slip thread is provided on the periphery of the upper end of the expansion cylinder assembly.

[0011] Preferably, the support frame is connected with a position adjustment handle.

[0012] The present invention also provides a minimally invasive surgical distraction system, including a minimally invasive surgical distraction device and a universal arm, which includes an adjustment rod, a fixing device, a height adjustment block, a locking knob, a rear connecting rod, a middle connecting rod, a front connecting rod, an end connecting rod, a rear joint, a middle joint, a front joint and a joint locking knob, wherein the fixing device is connected to the lower end of the adjustment rod;

[0013] The height adjustment block is slidably connected to the adjustment rod, the locking knob is connected to the height adjustment block through a threaded structure, and the locking knob passes through the height adjustment block to press the adjustment rod;

[0014] One end of the rear connecting rod is fixedly connected to the height adjustment block, the other end of the rear connecting rod is connected to the rear end of the middle connecting rod through a rear joint, the front end of the middle connecting rod is connected to the rear end of the front connecting rod through a middle joint, the front end of the front connecting rod is connected to the rear end of the terminal connecting rod through a front joint, and the joint locking knob is connected to the middle joint;

[0015] The minimally invasive surgical expansion device shown includes an expansion cylinder assembly, a support frame, a base, a threaded drive rod jacket, a light source interface component, a threaded drive rod, a first transmission connecting rod and a second transmission connecting rod. The support frame is connected to the base, and the light source interface component is connected to the base. The expansion cylinder assembly includes a left expansion semi-cylinder and a right expansion semi-cylinder. The top of the left expansion semi-cylinder is connected with a first rotating shaft, which is rotatably connected to the base, and the top of the right expansion semi-cylinder is connected with a second rotating shaft, which is rotatably connected to the base. The threaded drive rod jacket is connected to the base, the threaded drive rod jacket is provided with an internal thread, and the threaded drive rod is provided with an external thread. The external thread of the threaded drive rod is matched with the internal thread of the threaded drive rod jacket, and the top of the threaded drive rod is connected with a screw; the upper end of the first transmission connecting rod is hinged to the bottom of the threaded drive rod, the lower end of the first transmission connecting rod is hinged to the left expansion semi-cylinder, the upper end of the second transmission connecting rod is hinged to the bottom of the threaded drive rod, and the lower end of the second transmission connecting rod is hinged to the right expansion semi-cylinder;

[0016] The support frame is fixedly connected to the front end of the end connecting rod.

[0017] Preferably, the fixing device includes a lower fixing claw, an upper fixing claw, a clamping knob, a spring support sleeve, a spring and a guide column, the lower fixing claw is fixedly connected to the lower end of the adjusting rod, the spring support sleeve is fixedly connected to the lower part of the adjusting rod, the lower part of the adjusting rod passes through the fixing claw, the upper fixing claw is sleeved on the spring support sleeve, the upper fixing claw is provided with a spring accommodating chamber, the spring is arranged in the spring accommodating chamber, the lower end of the spring abuts against the top of the spring support sleeve, the lower fixing claw is provided with a guide hole, the guide column is fixedly connected to the upper fixing claw, the guide column is located in the guide hole, the clamping knob is provided with an internal thread, the internal thread of the clamping knob is matched with the external thread of the lower part of the adjusting rod, the clamping knob is located above the upper fixing claw, and the upper fixing claw can slide along the spring support sleeve in the direction of the lower fixing claw.

[0018] Preferably, the fixing device further comprises a washer, which is sleeved on the lower part of the adjusting rod and is located between the clamping knob and the fixing claw.

[0019] Preferably, a first opening angle limiting groove is provided on the top of the left opened semi-cylinder, and a second opening angle limiting groove is provided on the top of the right opened semi-cylinder. A first limiting column and a second limiting column are connected to the base, and the first limiting column passes through the first opening angle limiting groove, and the second limiting column passes through the second opening angle limiting groove.

[0020] The beneficial effects of the present invention are that it is easy to operate, stable and reliable, and the doctor can adjust the expansion angle and distance as needed. During the expansion process, the expansion distance remains unchanged at any position. The threaded drive rod and the threaded drive rod jacket are matched by threads, so that the expansion action is smooth and accurate. The limiting structure is designed to determine the maximum expansion angle to avoid excessive expansion and damage to muscle tissue. Anti-slip threads are set on the periphery of the expansion cylinder assembly to prevent the expansion cylinder assembly from slipping outwards when it enters the human body and contacts the muscles for expansion. The material of the expansion cylinder assembly is preferably X-ray transparent material, which is convenient for surgical perspective and convenient for doctors to judge the position.

[0021] Further features of the present invention will be clearly described in the following description of the specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a stereoscopic diagram of the minimally invasive surgical distraction device of the present invention;

[0023] Figure 2 yes Figure 1 A front view of the structure shown;

[0024] Figure 3 yes Figure 1 a top view of the structure shown;

[0025] Figure 4 yes Figure 1 a right side view of the structure shown;

[0026] Figure 5 yes Figure 4 In the illustrated structure, a schematic diagram of the expansion cylinder assembly, the base and the threaded drive rod jacket connected together;

[0027] Figure 6 yes Figure 5 Sectional view in the AA direction;

[0028] Figure 7 yes Figure 5 Cross-sectional view in the BB direction;

[0029] Figure 8 yes Figure 7 In the structure shown, a schematic diagram of the threaded drive rod being connected to the expansion cylinder assembly via two connecting rods;

[0030] Fig. 9 It is a structural schematic diagram of the left expansion semi-cylinder and the right expansion semi-cylinder of the expansion cylinder assembly in the minimally invasive surgery expansion device in the expansion state;

[0031] Fig.10 yes Fig. 9 a top view of the structure shown;

[0032] Fig.11 It is a schematic diagram of a wrench acting on the top screw of a threaded drive rod;

[0033] Fig.12 It is a top view of the universal arm;

[0034] Fig.13 It is the front view of the universal arm;

[0035] Fig.14 It is the right side view of the universal arm;

[0036] Fig.15 is a cross-sectional view of the universal arm;

[0037] Fig.16 yes Fig.15 A local enlarged view of point P in the middle.

[0038] Explanation of symbols in the figure:

[0039] 10. Open cylinder assembly, 11. Left open semi-cylinder, 11-1. First rotating shaft, 11-2. First opening angle limiting groove, 12. Right open semi-cylinder, 12-1. Second rotating shaft, 12-2. Second opening angle limiting groove, 10-1. Anti-slip thread, 20. Support frame, 30. Base, 30-1. First limiting column, 30-2. Second limiting column, 40. Threaded drive rod jacket, 50. Light source interface component, 60. Threaded drive rod, 61. Screw, 70. First transmission connecting rod, 80. Second transmission connecting rod; 90. Wrench, 100. Position adjustment handle Handle; B1. Adjusting rod, B2. Lower fixing claw, B2-1. Guide hole, B3. Upper fixing claw, B3-1. Spring accommodating chamber, B4. Clamping knob, B5. Screw, B6. Spring support sleeve, B7. Washer, B8. Spring, B9. Guide column, B10. Height adjustment block, B11. Locking knob, B12. Rear connecting rod, B13. Middle connecting rod, B14. Front connecting rod, B15. End connecting rod, B17. Rear joint, B18. Middle joint, B19. Front joint, B20. Joint locking knob, B21. Silicone rubber gasket, B22. Bolt. DETAILED DESCRIPTION

[0040] The present invention will be further described in detail below with reference to the accompanying drawings by way of specific embodiments.

[0041] like Figure 1-8 The minimally invasive surgical distraction device shown (in a closed state) includes a distraction cylinder assembly 10, a support frame 20, a base 30, a threaded drive rod sleeve 40, a light source interface component 50, a threaded drive rod 60, a first transmission connecting rod 70, and a second transmission connecting rod 80. The support frame 20 is connected to the base 30. The distraction cylinder assembly 10 includes a left distraction semi-cylinder 11 and a right distraction semi-cylinder 12. The top of the left distraction semi-cylinder 11 is connected to a first rotating shaft 11-1, and the first rotating shaft 11-1 is rotatably connected to the base 30. The top of the right distraction semi-cylinder 12 is connected to a second rotating shaft 12-1, and the second rotating shaft 12- 1 is rotatably connected to the base 30, the threaded drive rod outer sleeve 40 is connected to the base 30, the threaded drive rod outer sleeve 40 is provided with an internal thread, the threaded drive rod 60 is provided with an external thread, the external thread of the threaded drive rod 60 is connected and matched with the internal thread of the threaded drive rod outer sleeve 40, and the top of the threaded drive rod 60 is connected with a screw 61; the upper end of the first transmission connecting rod 70 is hinged to the bottom of the threaded drive rod 60, the lower end of the first transmission connecting rod 70 is hinged to the left open semi-cylinder 11, the upper end of the second transmission connecting rod 80 is hinged to the bottom of the threaded drive rod 60, and the lower end of the second transmission connecting rod 80 is hinged to the right open semi-cylinder 12. The light source interface component 50 is connected to the base 30, and the light source interface component 50 is provided with a light source connection oblique hole for installing a light source, and the number of the oblique holes is preferably 3, and the surgical field of view is better after installing 3 light sources.

[0042] When using the above-mentioned minimally invasive surgical expansion device, the expansion cylinder assembly 10 in a closed state is inserted into the human body, and then Fig.11 As shown, the screw 61 is rotated by a wrench 90 to allow the threaded drive rod 60 to move downward in the threaded drive rod housing 40, and the threaded drive rod 60 drives the first transmission connecting rod 70 and the second transmission connecting rod 80 to separate the left half cylinder 11 and the right half cylinder 12 by a certain angle (such as Fig. 9 and 10 As shown in the figure, the expansion action is completed; it can be seen that the doctor can adjust the expansion angle and distance according to actual needs. During the expansion process, the expansion distance remains unchanged at any position. Rotating the screw 61 in the opposite direction can reset the left expansion semi-cylinder 11 and the right expansion semi-cylinder 12.

[0043] When the expansion cylinder assembly enters the human body and contacts and expands the muscles, in order to prevent it from slipping outward, an anti-skid thread 10-1 is provided on the outer periphery of the upper end of the expansion cylinder assembly 10.

[0044] In order to limit the opening angles of the left and right semi-cylinders 11 and 12 (mainly to avoid excessive expansion and damage to muscle tissue), a first opening angle limiting groove 11-2 is set at the top of the left semi-cylinder 11, and a second opening angle limiting groove 12-2 is set at the top of the right semi-cylinder 12. A first limiting column 30-1 and a second limiting column 30-2 are connected to the base 30, and the first limiting column 30-1 passes through the first opening angle limiting groove 11-2, and the second limiting column 30-2 passes through the second opening angle limiting groove 12-2. During the expansion process of the left expanded semi-cylinder 11 and the right expanded semi-cylinder 12, the positions of the first limit column 30-1 and the second limit column 30-2 remain unchanged, the top of the first expansion angle limiting groove 11-2 contacts the first limit column 30-1, and at the same time, the top of the second expansion angle limiting groove 12-2 contacts the second limit column 30-2. At this time, the left expanded semi-cylinder 11 and the right expanded semi-cylinder 12 will not continue to separate, that is, the maximum expansion angle is reached.

[0045] It should be noted that the expansion cylinder assembly 10 can be made of X-ray transparent materials (to facilitate surgical perspective and facilitate the doctor to determine the position), such as carbon fiber materials or PEEK materials.

[0046] like Fig.11 As shown, when using the above-mentioned minimally invasive surgical distraction device, a position adjustment handle 100 can be used for auxiliary operations. The position adjustment handle 100 is connected to the support frame 20, and the entire minimally invasive surgical distraction device is supported on the position adjustment handle 100 to adjust the position of the distraction cylinder assembly 10.

[0047] like Figure 12-16As shown, when using the above-mentioned minimally invasive surgical distraction device, a universal arm can be used for auxiliary operations, and the universal arm includes an adjusting rod B1, a lower fixing claw B2, an upper fixing claw B3, a clamping knob B4, a screw B5, a spring support sleeve B6, a washer B7, a spring B8, a guide column B9, a height adjustment block B10, a locking knob B11, a rear connecting rod B12, a middle connecting rod B13, a front connecting rod B14, an end connecting rod B15, a rear joint B17, a middle joint B18, a front joint B19, a joint locking knob B20, and a silicone rubber gasket B21.

[0048] The lower fixed claw B2 is fixedly installed on the lower end of the adjusting rod B1 by means of screws B5. The spring support sleeve B6 is fixedly connected to the lower part of the adjusting rod B1 by means of interference fit. The lower part of the adjusting rod B1 passes through the fixed claw B3. The upper fixed claw B3 is sleeved on the spring support sleeve B6. The upper fixed claw B3 is provided with a spring accommodating chamber B3-1. The spring B8 is placed in the spring accommodating chamber B3-1. The lower end of the spring B8 is in contact with the top of the spring support sleeve B6. The lower fixed claw B2 is provided with Guide hole B2-1, guide column B9 is fixedly connected with upper fixed claw B3, guide column B9 is located in guide hole B2-1 (guide column B9 can slide in guide hole B2-1), clamping knob B4 is provided with internal thread, internal thread of clamping knob B4 is matched with external thread of lower part of adjusting rod B1, clamping knob B4 is located above upper fixed claw B3, washer B7 is sleeved on lower part of adjusting rod B1, washer B7 is located between clamping knob B4 and fixed claw B3. Doctor manually turns clamping knob B4, clamping knob B4 applies thrust to washer B7 and upper fixed claw B3, upper fixed claw B3 slides along spring support sleeve B6 toward lower fixed claw B2, spring B8 is compressed, guide column B9 slides downward in guide hole B2-1, spacing between upper fixed claw B3 and lower fixed claw B2 gradually decreases and then clamps on operating table, thus fixing adjusting rod B1. When releasing the upper fixing claw B3 and the lower fixing claw B2 from the operating table, just turn the clamping knob B4 in the opposite direction. If necessary, the mechanism consisting of the lower fixing claw B2, the upper fixing claw B3, the clamping knob B4, the screw B5, the spring support sleeve B6, the washer B7, the spring B8 and the guide column B9 can also be replaced by other fixing devices in the prior art.

[0049] The height adjustment block B10 is sleeved on the adjustment rod 1, and the height adjustment block B10 can slide up and down along the adjustment rod B1. The locking knob B11 is connected to the height adjustment block B10 through a threaded structure, and the locking knob B11 passes through the height adjustment block B10 to press the adjustment rod B1.

[0050] One end of the rear connecting rod B12 is fixedly connected to the height adjustment block B10 through a threaded structure, and the other end of the rear connecting rod B12 is connected to the rear end of the middle connecting rod B13 through a rear joint B17. The front end of the middle connecting rod B13 is connected to the rear end of the front connecting rod B14 through a middle joint B18. The front end of the front connecting rod B14 is connected to the rear end of the terminal connecting rod B15 through a front joint B19. The support frame 20 is fixedly connected to the front end of the terminal connecting rod B15 by a bolt B22. The joint locking knob B20 is connected to the middle joint B18 for locking the middle joint B18; a silicone rubber gasket B21 is connected between the joint locking knob B20 and the middle joint B18 to enhance the locking and fixing effect.

[0051] When using the universal arm, the rear joint B17, the middle joint B18 and the front joint B19 can be freely swung in a loose state until the expansion cylinder assembly 10 is adjusted to an ideal position. The doctor manually rotates the joint locking knob B20 to lock the middle joint B18 in place, thereby supporting and positioning the expansion cylinder assembly 10 in an ideal position.

[0052] It should be noted that the mechanism consisting of the front link B14 and the end link B15 can be provided in two groups to meet the support and positioning requirements of the two spreading devices.

[0053] The rear connecting rod B12, the middle connecting rod B13, the front connecting rod B14 and the end connecting rod B15 can be made of titanium alloy material to reduce their own weight, which is beneficial to the stability of the spreader.

[0054] The rear joint B17, the middle joint B18, the front joint B19 and the corresponding connecting rod connections are all provided with diamond coatings to enhance the anti-friction performance.

[0055] The universal arm is easy to operate, stable and reliable, and can support and position the expansion cylinder assembly 10 at any position to meet the actual operation requirements of the surgery.

[0056] The present invention and its implementation modes are described schematically above. If a person skilled in the art is inspired by it, without departing from the inventive purpose of the present invention, other forms of part configurations, drive devices and connection methods are adopted without creative design to form structures and implementation modes similar to the technical scheme, which should all fall within the protection scope of the present invention.

Claims

1. A minimally invasive surgical distraction device, characterized in that: The invention comprises an expansion cylinder assembly, a support frame, a base, a threaded drive rod sleeve, a light source interface component, a threaded drive rod, a first transmission connecting rod and a second transmission connecting rod, wherein the support frame is connected to the base, and the light source interface component is connected to the base, the expansion cylinder assembly comprises a left expansion semi-cylinder and a right expansion semi-cylinder, the top of the left expansion semi-cylinder is connected with a first rotating shaft, the first rotating shaft is rotatably connected to the base, the top of the right expansion semi-cylinder is connected with a second rotating shaft, the second rotating shaft is rotatably connected to the base, the threaded drive rod sleeve is connected to the base, the threaded drive rod sleeve is provided with an internal thread, the threaded drive rod is provided with an external thread, the external thread of the threaded drive rod is connected and matched with the internal thread of the threaded drive rod sleeve, and the top of the threaded drive rod is connected with a screw; the upper end of the first transmission connecting rod is hinged to the bottom of the threaded drive rod, the lower end of the first transmission connecting rod is hinged to the left expansion semi-cylinder, the upper end of the second transmission connecting rod is hinged to the bottom of the threaded drive rod, and the lower end of the second transmission connecting rod is hinged to the right expansion semi-cylinder.

2. The minimally invasive surgical distraction device according to claim 1, characterized in that: A first opening angle limiting groove is provided at the top of the left opened semi-cylinder, and a second opening angle limiting groove is provided at the top of the right opened semi-cylinder. A first limiting column and a second limiting column are connected to the base, and the first limiting column passes through the first opening angle limiting groove, and the second limiting column passes through the second opening angle limiting groove.

3. The minimally invasive surgical distraction device according to claim 1 or 2, characterized in that: The expansion cylinder assembly is made of X-ray transparent material.

4. The minimally invasive surgical distraction device according to claim 3, characterized in that: The X-ray transparent material is a carbon fiber material or a PEEK material.

5. The minimally invasive surgical distraction device according to claim 2, characterized in that: The light source interface component is provided with three light source connecting oblique holes for installing the light source.

6. The minimally invasive surgical distraction device according to claim 1, characterized in that: The periphery of the upper end of the expansion cylinder assembly is provided with anti-skid threads.

7. The minimally invasive surgical distraction device according to claim 1, characterized in that: The support frame is connected with a position adjustment handle.

8. A minimally invasive surgical distraction system, characterized in that: It includes a minimally invasive surgical distraction device and a universal arm, wherein the universal arm includes an adjustment rod, a fixing device, a height adjustment block, a locking knob, a rear connecting rod, a middle connecting rod, a front connecting rod, an end connecting rod, a rear joint, a middle joint, a front joint and a joint locking knob, and the fixing device is connected to the lower end of the adjustment rod; The height adjustment block is slidably connected to the adjustment rod, the locking knob is connected to the height adjustment block via a threaded structure, and the locking knob passes through the height adjustment block to press the adjustment rod; One end of the rear connecting rod is fixedly connected to the height adjustment block, the other end of the rear connecting rod is connected to the rear end of the middle connecting rod through a rear joint, the front end of the middle connecting rod is connected to the rear end of the front connecting rod through a middle joint, the front end of the front connecting rod is connected to the rear end of the terminal connecting rod through a front joint, and the joint locking knob is connected to the middle joint; The minimally invasive surgical expansion device shown includes an expansion cylinder assembly, a support frame, a base, a threaded drive rod sleeve, a light source interface component, a threaded drive rod, a first transmission connecting rod and a second transmission connecting rod. The support frame is connected to the base, and the light source interface component is connected to the base. The expansion cylinder assembly includes a left expansion semi-cylinder and a right expansion semi-cylinder. The top of the left expansion semi-cylinder is connected to a first rotating shaft, and the first rotating shaft is rotatably connected to the base. The top of the right expansion semi-cylinder is connected to a second rotating shaft, and the second rotating shaft is rotatably connected to the base. The outer sleeve of the threaded drive rod is connected to the base, the outer sleeve of the threaded drive rod is provided with an internal thread, the threaded drive rod is provided with an external thread, the external thread of the threaded drive rod is connected and matched with the internal thread of the outer sleeve of the threaded drive rod, and the top of the threaded drive rod is connected with a screw; the upper end of the first transmission connecting rod is hinged to the bottom of the threaded drive rod, the lower end of the first transmission connecting rod is hinged to the left open semi-cylinder, the upper end of the second transmission connecting rod is hinged to the bottom of the threaded drive rod, and the lower end of the second transmission connecting rod is hinged to the right open semi-cylinder; The support frame is fixedly connected to the front end of the terminal connecting rod.

9. The minimally invasive surgical distraction system according to claim 8, characterized in that: The fixing device comprises a lower fixing claw, an upper fixing claw, a clamping knob, a spring support sleeve, a spring and a guide column, the lower fixing claw is fixedly connected to the lower end of the adjusting rod, the spring support sleeve is fixedly connected to the lower portion of the adjusting rod, the lower portion of the adjusting rod passes through the fixing claw, the upper fixing claw is sleeved on the spring support sleeve, the upper fixing claw is provided with a spring accommodating chamber, the spring is arranged in the spring accommodating chamber, the lower end of the spring is in contact with the top of the spring support sleeve, the lower fixing claw is provided with a guide hole, the guide column is fixedly connected to the upper fixing claw, the guide column is located in the guide hole, the clamping knob is provided with an internal thread, the internal thread of the clamping knob is matched with the external thread of the lower portion of the adjusting rod, the clamping knob is located above the upper fixing claw, and the upper fixing claw can slide along the spring support sleeve in the direction of the lower fixing claw.

10. The minimally invasive surgical distraction system according to claim 9, characterized in that: The fixing device also includes a washer, which is sleeved on the lower part of the adjusting rod and is located between the clamping knob and the fixing claw.

11. The minimally invasive surgical distraction system according to claim 8 or 9, characterized in that: A first opening angle limiting groove is provided at the top of the left opened semi-cylinder, and a second opening angle limiting groove is provided at the top of the right opened semi-cylinder. A first limiting column and a second limiting column are connected to the base, and the first limiting column passes through the first opening angle limiting groove, and the second limiting column passes through the second opening angle limiting groove.

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