CN111419303A - Minimally invasive surgical distraction device and minimally invasive surgical distraction system - Google Patents

Abstract

The invention relates to a minimally invasive surgery distraction device and a minimally invasive surgery distraction system, which solve the problem that the existing spine minimally invasive surgery distraction device is difficult to operate, the distraction angle is fixed and cannot be freely adjusted; the distraction action is not enough The technical problem is stable and easy to cause muscle tissue damage, which includes a spreader cylinder assembly, a support frame, a base, a threaded drive rod jacket, a light source interface component, and a threaded drive rod. The spreader cylinder assembly includes a left spreader semi-cylinder The top of the left open semi-cylinder is rotatably connected to the base through the first rotating shaft, the top of the right open semi-cylinder is rotatably connected to the base through the second rotating shaft, and the threaded drive rod jacket is connected to the base. The threaded driving rod is connected and matched with the outer casing of the threaded driving rod. The top of the threaded driving rod is connected with a screw; Connect with the right open half cylinder. The present invention is widely used in the technical field of medical devices.

Description

Minimally invasive surgical distraction device and minimally invasive surgical distraction system

technical field

The invention relates to the technical field of minimally invasive surgery in spinal surgery, in particular to a minimally invasive surgery distraction device and a minimally invasive surgery distraction system.

Background technique

In the field of minimally invasive spine surgery technology, minimally invasive spine surgery has the advantages of small incision, less trauma, and quick recovery, and is the development trend of spine surgery; For intervertebral disc decompression surgery, only a small channel is needed to open the surgical field and perform surgical operations.

The invention patent application with the publication number of CN110384526A discloses a minimally invasive surgery spreading device and a spreading device. However, the spreading device is difficult to operate, the opening angle is fixed and cannot be adjusted freely; the opening action is not stable enough, It can easily cause damage to muscle tissue.

SUMMARY OF THE INVENTION

The present invention is to solve the technical problems that the existing spinal minimally invasive surgery distraction device is difficult to operate, the distraction angle is fixed and cannot be adjusted freely; It is convenient, the opening angle can be adjusted freely, and the opening action is stable and reliable for the minimally invasive surgical opening device and the minimally invasive surgical opening system.

The invention provides a minimally invasive surgery spreading device, comprising a spreading cylinder assembly, a support frame, a base, a threaded drive rod jacket, a light source interface component, a threaded drive rod, a first transmission link and a second transmission link, The support frame is connected with the base, the light source interface part is connected with the base, the opening cylinder assembly includes a left opening semi-cylinder and a right opening semi-cylinder, the top of the left opening semi-cylinder is connected with a first rotating shaft, and the first rotating shaft is connected with the first rotating shaft. The base is rotatably connected, the top of the right open semi-cylinder is connected with a second rotating shaft, the second rotating shaft is rotatably connected with the base, and the threaded drive rod jacket is connected with the base, the threaded drive rod jacket is provided with an inner thread, and the threaded drive rod is provided with External thread, the external thread of the threaded drive rod is connected and matched with the internal thread of the threaded drive rod casing, the top of the threaded drive rod is connected with a screw; the upper end of the first transmission link is hinged with the bottom of the threaded drive rod, and the The lower end is hinged with the left opening semi-cylinder, the upper end of the second transmission link is hinged with the bottom of the threaded drive rod, and the lower end of the second transmission link is hinged with the right opening semi-cylinder.

Preferably, the top of the left stretched semi-cylinder 11 is provided with a first stretched angle limiting groove, the top of the right stretched semi-cylinder is provided with a second stretched angle limiting groove, and the base is connected with a first limiting column and a second stretched angle limiting groove. Two limiting columns, the first limiting column passes through the first opening angle limiting slot, and the second limiting column passes through the second opening angle limiting slot.

Preferably, the spreader cylinder assembly is made of an X-ray transparent material.

Preferably, the X-ray transparent material is carbon fiber material or PEEK material.

Preferably, the light source interface component is provided with three light source connection inclined holes for installing the light source.

Preferably, an anti-skid thread is provided on the periphery of the upper end of the opening cylinder assembly.

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

The present invention also provides a minimally invasive surgical distraction system, including a minimally invasive surgical distraction device and a universal arm, as shown, including an adjusting rod, a fixing device, a height adjusting block, a locking knob, a rear connecting rod, and a middle connecting rod , the front link, the end link, the rear joint, the middle joint, the front joint and the joint locking knob, the fixing device is connected with the lower end of the adjusting rod;

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

One end of the rear link is fixedly connected with the height adjustment block, the other end of the rear link is connected with the rear end of the middle link through the rear joint, and the front end of the middle link is connected with the rear end of the front link through the middle joint. The front end of the front link is connected with the rear end of the end link through the front joint, and the joint locking knob is connected with the middle joint;

The shown minimally invasive surgery spreading device includes a spreading cylinder assembly, a support frame, a base, a threaded drive rod cover, a light source interface component, a threaded drive rod, a first transmission link and a second transmission link, the support frame and the base. The base is connected, the light source interface part is connected with the base, the opening cylinder assembly includes a left opening semi-cylinder and a right opening semi-cylinder, the top of the left opening semi-cylinder is connected with a first rotating shaft, and the first rotating shaft is rotatably connected with the base , the top of the right open semi-cylinder is connected with a second rotating shaft, the second rotating shaft is rotatably connected with the base, the threaded drive rod jacket is connected with the base, the threaded drive rod jacket is provided with an internal thread, the threaded drive rod is provided with an external thread, and the threaded drive rod is provided with an external thread. The outer thread of the drive rod is connected and matched with the inner 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 link is hinged with the bottom of the threaded drive rod, and the lower end of the first transmission link is connected with the left support The opening semi-cylinder is hinged, the upper end of the second transmission link is hinged with the bottom of the threaded drive rod, and the lower end of the second transmission link is hinged with the right open semi-cylinder;

The support frame is fixedly connected with the front end of the end link.

Preferably, 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 with the lower end of the adjusting rod, and the spring supporting sleeve is fixed with the lower part of the adjusting rod Connection, the lower part of the adjustment rod passes through the fixed claw, the upper fixed claw is sleeved on the spring support sleeve, the upper fixed claw is provided with a spring accommodating chamber, the spring is arranged in the spring accommodating chamber, and the lower end of the spring is connected to the top of the spring support sleeve. The lower fixed claw is provided with a guide hole, the guide column is fixedly connected with the upper fixed claw, the guide column is located in the guide hole, the clamping knob is provided with an inner thread, and the inner thread of the clamping knob is matched with the outer thread of the lower part of the adjusting rod connection, the clamping knob is located above the upper fixed claw, and the upper fixed claw can slide in the direction of the downward fixed claw along the spring support sleeve.

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

Preferably, the top of the left stretched semi-cylinder is provided with a first stretched angle limiting groove, the top of the right stretched semi-cylinder is provided with a second stretched angle limiting groove, and the base is connected with a first limiting post and a second limiting post. Limiting columns, 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.

The beneficial effect of the invention is that the operation is convenient, stable and reliable, the doctor can arbitrarily adjust the size of the opening angle and the distance according to actual needs, and the opening distance remains unchanged in any position during the opening process. The threaded driving rod and the threaded driving rod casing are matched by threads, so that the opening action is stable and the precision is high. The limit structure is designed to determine the maximum opening angle, so as to avoid the occurrence of excessive opening and damage to the muscle tissue. Anti-skid threads are arranged on the periphery of the opening cylinder assembly to avoid the situation of slipping outward when the opening cylinder assembly enters the human body and is in contact with the muscles. The material of the opening cylinder assembly is preferably an X-ray transparent material, which is convenient for surgical fluoroscopy and convenient for doctors to determine the position.

Further features of the present invention will be clearly described in the following description of the specific embodiments.

Description of drawings

1 is a perspective view of a minimally invasive surgery distraction device of the present invention;

Fig. 2 is the front view of the structure shown in Fig. 1;

Fig. 3 is the top view of the structure shown in Fig. 1;

Fig. 4 is the right side view of the structure shown in Fig. 1;

Figure 5 is a schematic view of the structure shown in Figure 4, the expansion cylinder assembly, the base and the threaded drive rod casing are connected together;

Fig. 6 is the sectional view of A-A direction in Fig. 5;

Fig. 7 is the sectional view of the direction B-B in Fig. 5;

Figure 8 is a schematic view of the structure shown in Figure 7, the threaded drive rod is connected to the opening cylinder assembly through two connecting rods;

FIG. 9 is a schematic structural diagram of the left spreading semi-cylinder and the right spreading semi-cylinder in the spreading state of the spreading cylinder assembly in the minimally invasive surgery spreading device;

Figure 10 is a top view of the structure shown in Figure 9;

Figure 11 is a schematic diagram of the wrench acting on the screw at the top of the threaded drive rod;

Figure 12 is a top view of the gimbal arm;

Figure 13 is a front view of the gimbal arm;

Figure 14 is a right side view of the gimbal arm;

Figure 15 is a cross-sectional view of a gimbal arm;

FIG. 16 is a partial enlarged view of P in FIG. 15 .

Description of symbols in the figure:

10. Open cylinder assembly, 11. Left open semi-cylinder, 11-1. First shaft, 11-2. First open angle limiting groove, 12. Right open semi-cylinder, 12-1. Second Rotating shaft, 12-2. Second opening angle limiting groove, 10-1. Anti-skid thread, 20. Support frame, 30. Base, 30-1. First limit post, 30-2. Second limit post , 40. Threaded drive rod cover, 50. Light source interface parts, 60. Threaded drive rod, 61. Screw, 70. First transmission link, 80. Second transmission link; 90. Wrench, 100. Position adjustment handle; B1. Adjusting rod, B2. Lower fixed jaw, B2-1. Guide hole, B3. Upper fixed jaw, B3-1. Spring accommodating chamber, B4. Clamping knob, B5. Screw, B6. Spring support sleeve, B7. Washer, B8. Spring, B9. Guide post, B10. Height adjustment block, B11. Lock knob, B12. Rear link, B13. Middle link, B14. Front link, B15. End link , B17. Rear joint, B18. Middle joint, B19. Front joint, B20. Joint locking knob, B21. Silicone rubber gasket, B22. Bolt.

Detailed ways

Hereinafter, the present invention will be further described in detail with specific embodiments with reference to the accompanying drawings.

The minimally invasive surgical spreading device shown in Figures 1-8 (in a closed state), which includes a spreading cylinder assembly 10, a support frame 20, a base 30, a threaded drive rod cover 40, a light source interface component 50, a threaded drive The rod 60, the first transmission link 70, the second transmission link 80, the support frame 20 is connected with the base 30, the spreading cylinder assembly 10 includes a left spreading semi-cylinder 11 and a right spreading semi-cylinder 12, the left spreading The top of the semi-cylinder 11 is connected with a first rotating shaft 11-1, the first rotating shaft 11-1 is rotatably connected with the base 30, and the top of the right-opening semi-cylinder 12 is connected with a second rotating shaft 12-1, and the second rotating shaft 12-1 It is rotatably connected with the base 30, and the threaded drive rod casing 40 is connected with the base 30. The threaded drive rod casing 40 is provided with an internal thread, the threaded drive rod 60 is provided with an external thread, and the external thread of the threaded drive rod 60 is connected to the threaded drive rod casing 40. The top of the threaded drive rod 60 is connected with a screw 61; the upper end of the first transmission link 70 is hinged with the bottom of the threaded drive rod 60, and the lower end of the first transmission link 70 is hinged with the left open semi-cylinder 11 , the upper end of the second transmission link 80 is hinged with the bottom of the threaded drive rod 60 , and the lower end of the second transmission link 80 is hinged with the right opening semi-cylinder 12 . The light source interface part 50 is connected to the base 30, and the light source interface part 50 is provided with a light source connecting inclined hole for installing the light source.

When using the above-mentioned minimally invasive surgical expansion device, insert the expansion cylinder assembly 10 in the closed state into the human body, and then rotate the screw 61 with the wrench 90 as shown in FIG. Downward movement, the threaded drive rod 60 drives through the first transmission link 70 and the second transmission link 80 to separate the left opening semi-cylinder 11 and the right opening semi-cylinder 12 by a certain angle (as shown in Figures 9 and 10 ), completing It can be seen that the doctor can arbitrarily adjust the size of the opening angle and distance according to the actual needs. During the opening process, the opening distance remains unchanged in any position. Rotating the screw 61 in the opposite direction can reset the left spreading semi-cylinder 11 and the right spreading semi-cylinder 12 .

When the opening cylinder assembly enters the human body and contacts the muscles, in order to prevent outward slippage, a non-slip thread 10 - 1 is provided on the periphery of the upper end of the opening cylinder assembly 10 .

In order to limit the opening angle of the left opening semi-cylinder 11 and the right opening semi-cylinder 12 (mainly to avoid the occurrence of excessive opening and damaging the muscle tissue), a first opening angle is set on the top of the left opening semi-cylinder 11 The restriction groove 11-2 is provided with a second opening angle restriction slot 12-2 at the top of the right opening semi-cylinder 12, and the first limit post 30-1 and the second limit post 30-2 are connected to the base 30 , 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 opening process of the left opening semi-cylinder 11 and the right opening semi-cylindrical 12, the positions of the first limit post 30-1 and the second limit post 30-2 remain unchanged, and the position of the first opening angle limiting groove 11-2 remains unchanged. The top is in contact with the first limit post 30-1, and at the same time the top of the second opening angle restricting groove 12-2 is in contact with the second limit post 30-2. At this time, the left-opening semi-cylinder 11 and the right-opening semi-cylinder are 12 will not continue to separate, that is, to reach the maximum open angle.

It should be noted that, the expanding cylinder assembly 10 can be made of X-ray transparent material (convenient for surgical perspective and convenient for doctors to determine the position), such as carbon fiber material or PEEK material.

As shown in FIG. 11 , when the above-mentioned minimally invasive surgery distraction device is used, the 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 surgery distraction device is supported on the position adjustment handle 100 Further, the position of the opening cylinder assembly 10 is adjusted.

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

The lower fixed claw B2 is fixedly installed on the lower end of the adjusting rod B1 through the screw B5, the spring support sleeve B6 is fixedly connected with 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, and the upper fixed clamp The claw B3 is sleeved on the spring support sleeve B6, the upper fixed claw B3 is provided with a spring accommodating chamber B3-1, and the spring B8 is placed in the spring accommodating chamber B3-1. The fixed claw B2 is provided with a guide hole B2-1, the guide column B9 is fixedly connected with the upper fixed claw B3, the guide column B9 is located in the guide hole B2-1 (the guide column B9 can slide in the guide hole B2-1), the clip The tightening knob B4 is provided with an inner thread, the inner thread of the clamping knob B4 is matched with the outer thread of the lower part of the adjusting rod B1, the clamping knob B4 is located above the upper fixing claw B3, and the washer B7 is sleeved on the lower part of the adjusting rod B1. B7 is located between the clamping knob B4 and the fixed jaw B3. The doctor twists the clamping knob B4 by hand, and the clamping knob B4 applies a thrust to the washer B7 and the upper fixed claw B3, and the upper fixed claw B3 slides along the spring support sleeve B6 in the downward direction of the fixed claw B2, and the spring B8 is compressed , the guide post B9 slides downward in the guide hole B2-1, and the distance between the upper fixed claw B3 and the lower fixed claw B2 gradually decreases and is clamped on the operating bed to realize the fixation of the adjusting rod B1. When loosening the upper fixed claw B3 and the lower fixed claw B2 from the operating bed, turn the clamping knob B4 in the opposite direction. When it needs to be explained, the mechanism composed of the lower fixed claw B2, the upper fixed 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 use the existing technology. other fixtures instead.

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 with the height adjustment block B10 through a threaded structure, and the locking knob B11 passes through the height adjustment block B10 and pushes the adjustment rod B1.

One end of the rear link B12 is fixedly connected to the height adjustment block B10 through a threaded structure, the other end of the rear link B12 is connected to the rear end of the middle link B13 through the rear joint B17, and the front end of the middle link B13 is connected through the middle joint B18 It is connected to the rear end of the front link B14, the front end of the front link B14 is connected to the rear end of the end link B15 through the front joint B19, and the support frame 20 is fixedly connected to the front end of the end link B15 with bolts B22. The joint locking knob B20 is connected with the middle joint B18 for locking the middle joint B18; a silicon rubber gasket B21 is connected between the joint locking knob B20 and the middle joint B18, which can enhance the locking and fixing effect.

When using the above universal arm, the rear joint B17, the middle joint B18 and the front joint B19 can swing freely in the released state until the opening cylinder assembly 10 is adjusted to the ideal position, and the doctor rotates the joint locking knob B20 by hand to make it. The middle joint B18 is locked and positioned so as to support and position the opening cylinder assembly 10 in a desired position.

It should be noted that, the mechanism composed of the front link B14 and the end link B15 can be provided with two groups to meet the support and positioning of the two spreading devices.

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, which can reduce its own weight and help the stability of the spreader.

The rear joint B17, the middle joint B18, the front joint B19 and the connection of the corresponding connecting rod are all provided with diamond coating to enhance the anti-friction performance.

The above-mentioned universal arm is easy to operate, stable and reliable, and can realize the support and positioning of the opening cylinder assembly 10 at any position, so as to meet the actual operation needs of the operation.

The present invention and its embodiments have been schematically described above. If those skilled in the art are inspired by it, without departing from the inventive concept of the present invention, other forms of component configurations, driving devices and connection methods can be used without modification. The inventive design and the similar structural modes and embodiments of the technical solution shall all belong to the protection scope of the present invention.

Claims (11)

1. a minimally invasive surgery opening device, is characterized in that, comprises opening cylinder assembly, support frame, base, threaded drive rod jacket, light source interface component, threaded drive rod, the first transmission link and the second transmission connecting rod, the support frame is connected with the base, the light source interface part is connected with the base, the stretched cylinder assembly includes a left stretched semi-cylinder and a right stretched semi-cylinder, the top of the left stretched semi-cylinder is connected There is a first rotating shaft, the first rotating shaft is rotatably connected with the base, a second rotating shaft is connected to the top of the right open semi-cylinder, the second rotating shaft is rotatably connected with the base, and the threaded drive rod outer sleeve is connected with the base. The outer thread of the threaded driving rod is provided with an inner thread, the outer thread of the threaded driving rod is provided with an outer thread, and the outer thread of the threaded driving rod is connected and matched with the inner thread of the outer thread of the threaded driving rod, and the top of the threaded driving rod A screw is connected; the upper end of the first transmission link is hinged with the bottom of the threaded drive rod, the lower end of the first transmission link is hinged with the left opening semi-cylinder, and the upper end of the second transmission link is hinged with the threaded drive The bottom of the rod is hinged, and the lower end of the second transmission link is hinged with the right opening semi-cylinder. 2 . The minimally invasive surgery spreading device according to claim 1 , wherein the top of the left spreading semi-cylinder is provided with a first spreading angle limiting groove, and the top of the right spreading semi-cylinder is provided with a first spreading angle limiting groove. 3 . The second opening angle limiting groove, the base is connected with a first limiting column and a second limiting column, the first limiting column passes through the first opening angle limiting groove, and the second limiting column The post passes through the second spread angle limiting slot. 3 . The minimally invasive surgical expansion device according to claim 1 or 2 , wherein the expansion cylinder assembly is made of X-ray transparent material. 4 . 4 . The minimally invasive surgery distraction device according to claim 3 , wherein the X-ray transparent material is carbon fiber material or PEEK material. 5 . 5 . The minimally invasive surgery distraction device according to claim 2 , wherein the light source interface component is provided with three light source connection inclined holes for installing the light source. 6 . 6 . The minimally invasive surgical expansion device according to claim 1 , wherein the outer periphery of the upper end of the expansion cylinder assembly is provided with anti-slip threads. 7 . 7 . The minimally invasive surgery spreading device according to claim 1 , wherein the support frame is connected with a position adjustment handle. 8 . 8. A minimally invasive surgery distraction system, characterized in that it comprises a minimally invasive surgery distraction device and a universal arm, and shown includes an adjusting rod, a fixing device, a height adjusting block, a locking knob, a rear connecting rod, a middle connecting rod, front connecting rod, end connecting rod, rear joint, middle joint, front joint and joint locking knob, the fixing device is connected with the lower end of the adjusting rod; The height adjustment block is slidably connected with the adjustment rod, the locking knob is connected with the height adjustment block through a threaded structure, and the locking knob passes through the height adjustment block and presses the adjustment rod; One end of the rear link is fixedly connected to the height adjustment block, the other end of the rear link is connected to the rear end of the middle link through the rear joint, and the front end of the middle link is connected to the front link through the middle joint. The rear end is connected, the front end of the front link is connected with the rear end of the end link through the front joint, and the joint locking knob is connected with the middle joint; The shown minimally invasive surgery distraction device includes a distraction cylinder assembly, a support frame, a base, a threaded drive rod cover, a light source interface component, a threaded drive rod, a first transmission link and a second transmission link. is connected with the base, the light source interface part is connected with the base, the stretched cylinder assembly includes a left stretched semi-cylinder and a right stretched semi-cylinder, the top of the left stretched semi-cylinder is connected with a first rotating shaft, the The first rotating shaft is rotatably connected with the base, the top of the right open semi-cylinder is connected with a second rotating shaft, the second rotating shaft is rotatably connected with the base, the threaded drive rod outer sleeve is connected with the base, and the thread drives The rod casing is provided with an internal thread, the threaded driving rod is provided with an external thread, the external thread of the threaded driving rod is connected and matched with the internal thread of the threaded driving rod casing, and the top of the threaded driving rod is connected with a screw; The upper end of a transmission link is hinged with the bottom of the threaded drive rod, the lower end of the first transmission link is hinged with the left opening semi-cylinder, the upper end of the second transmission link is hinged with the bottom of the threaded drive rod, the The lower end of the second transmission link is hinged with the right opening semi-cylinder; The support frame is fixedly connected with the front end of the end link. 9 . The minimally invasive surgery distraction system according to claim 8 , wherein the fixing device comprises a lower fixing claw, an upper fixing claw, a clamping knob, a spring support sleeve, a spring and a guide post, the said 9 . The lower fixed claw is fixedly connected with the lower end of the adjustment rod, the spring support sleeve is fixedly connected with the lower part of the adjustment rod, the lower part of the adjustment rod passes through the fixed claw, and the upper fixed 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, and the guide post It is fixedly connected with the upper fixed claw, the guide column is located in the guide hole, the clamping knob is provided with an inner thread, and the inner thread of the clamping knob is matched with the outer thread of the lower part of the adjusting rod, and the clamping knob is located on the upper Above the fixing claws, the upper fixing claws can slide along the direction of the downward fixing claws of the spring support sleeve. 10 . The minimally invasive surgery distraction system according to claim 9 , wherein the fixing device further comprises a washer, the washer is sleeved on the lower part of the adjusting rod, and the washer is located between the clamping knob and the fixing claw. 11 . 11. The minimally invasive surgery distraction system according to claim 8 or 9, wherein the top of the left distraction semi-cylinder is provided with a first distraction angle limiting groove, and the top of the right distraction half-cylinder is provided with a first distraction angle limiting groove. A second opening angle limiting slot is provided, the base is connected with a first limiting column and a second limiting column, the first limiting column passes through the first opening angle limiting slot, the second limiting column The limiting post passes through the second opening angle limiting groove.

Images