Minimally invasive vertebral plate distraction device for cervical vertebra

Abstract

The invention relates to the technical field of medical equipment, and particularly discloses a cervical vertebra minimally invasive vertebral plate distraction device which comprises a handle, and a pressurizing cavity is formed in the handle. Through the transmission and positioning assembly, after the handle is held by one hand and the pressing plate is repeatedly pressed by the thumb, the piston rod can slide and pressurize in the pressurizing cavity, the abutting plate is driven to be opened, the position can be fixed through clamping of the clamping column and the driving gear after opening, operation is simplified, time is saved, the opening strength can be accurately controlled, and the working efficiency is improved. The problem that the vertebral plate distraction forceps are difficult to finely adjust in a narrow space is solved, the success rate and safety of an operation are improved, when the operation is finished, a communicating groove, a communicating pipe and a negative pressure assembly are utilized, a thumb presses a pressing disc to enable a long groove to be in negative pressure to enable a clamping rod to retract, and by means of a limiting spring, a piston rod slides downwards and an abutting plate shrinks, so that the device is rapidly taken out; the process greatly shortens the operation time, and reduces the operation difficulty of doctors and the operation risk of patients.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and specifically to a minimally invasive cervical laminar retractor device. Background Art

[0002] Posterior cervical single-door laminoplasty and spinal canal expansion is a commonly used surgical method for treating multi-segment cervical disc herniation and cervical spondylotic myelopathy. It involves making an incision in the center of the posterior neck, cutting the lamina of one side of the cervical vertebra, lifting the lamina backward to expand the cervical spinal canal, allowing the compressed spinal cord to drift backward, relieving spinal cord compression, and thus alleviating symptoms such as unsteady walking, numbness in hands and feet, weakness in hands and feet, and neck pain. However, this surgical method involves extensive muscle dissection, which can lead to atrophy of the posterior cervical muscle group, affecting the functional recovery and appearance of the patient. With the popularization of the concept of minimally invasive spine surgery, currently in China, minimally invasive or endoscopic techniques with less muscle dissection are adopted, precisely grinding the lamina and effectively retracting to achieve the purpose of expanding the cervical spinal canal.

[0003] During the operation, a retractor is a commonly used retracting device. The lamina retractor consists of a fixed rod and a movable rod that are hinged to each other. The fixed rod includes a handheld part and a fixed retracting section. The movable rod is provided with a limiting part and a telescopic retracting section. The top of both is equipped with a retracting plate. There is a return spring between the limiting part and the handheld part. During the operation, the doctor holds the movable rod and rotates it to achieve lamina retraction. After the telescopic retracting section extends, the retracting plate can be closely attached to the opening side of the lamina to prevent slipping. The limiting part precisely controls the stroke of the movable rod to ensure an appropriate retracting degree. However, its drawbacks are also relatively obvious. In the narrow and complex space of minimally invasive cervical spine surgery, the method of manually rotating the movable rod to retract the lamina has poor flexibility. When fine-tuning the retracting angle or position, restricted by the structure of the rod, it is difficult to make fine adjustments, affecting the accuracy of the surgical operation. During a long operation, affected by the vibration of the surgical operation, the retractor is prone to displacement or loosening, resulting in a change in the retracting degree or damage to the surrounding nerve tissue, affecting the surgical effect and progress.

[0004] Therefore, those skilled in the art have provided a minimally invasive cervical laminar retractor device to solve the problems raised in the above background art. Summary of the Invention

[0005] (1) Technical Problems to be Solved

[0006] Aiming at the deficiencies of the prior art, the present invention provides a minimally invasive cervical laminar retractor device, which solves the problems that in current minimally invasive cervical spine surgery, the conventional lamina retractor is inconvenient to use, affects the surgical field of view, has poor operation flexibility, is difficult to fine-tune, and is prone to insufficient or excessive lamina retraction during the operation, resulting in incomplete relief of nerve symptoms or nerve tissue damage on the contralateral side.

[0007] (2) Technical Solutions

[0008] To achieve the above object, the present invention provides the following technical solution: a minimally invasive cervical laminar retractor device, including a handle, wherein a pressure boosting chamber is provided inside the handle, a limiting column is fixedly connected inside the pressure boosting chamber, a piston rod is slidably connected to the outer surface of the limiting column, a silica gel ring is fixedly connected to the bottom end inside the pressure boosting chamber, a plug connector communicating with the inside of the pressure boosting chamber is fixedly connected to the top of the handle, a hose is fixedly sleeved on the outer surface of the plug connector, a pressure gauge is fixedly installed on the outer surface of the plug connector, an opening assembly is installed at one end of the hose away from the plug connector, a transmission assembly is installed inside the handle, a rotating rod is rotatably connected to the inside of the handle through a positioning bearing, a driven gear is fixedly connected to the end of the rotating rod, a positioning assembly is installed at the connection between the top end of the rotating rod and the handle, a rotating groove is provided inside the handle, a pressing plate is rotatably connected to the inside of the rotating groove, a first return spring is fixedly connected to the inside of the rotating groove, the end face of the first return spring is fixedly connected to the surface of the pressing plate, a ratchet wheel is fixedly connected to the surface of the pressing plate, a limiting spring is movably installed inside the pressure boosting chamber, and a negative pressure assembly is installed inside the handle.

[0009] Preferably, the transmission assembly includes a rotating rod inserted into the center inside the piston rod, a fixed bearing is fixedly installed at the top end of the outer surface of the rotating rod, a toothed ring and a sealing ring are fixedly sleeved on the outer surface of the rotating rod, a communicating groove is provided inside the handle, a communicating pipe communicating with the inside of the communicating groove is fixedly connected to the inside of the handle, and a toothed belt is meshingly installed on the outer surfaces of the toothed ring and the driven gear.

[0010] Preferably, a long groove is provided inside the rotating rod, a rubber sealing disc is hermetically slidably connected to the inside of the long groove, a clamping rod is fixedly connected to the surface of the rubber sealing disc, a trachea communicating with the inside of the long groove is fixedly connected to the inside of the rotating rod, a threaded groove is provided at the center inside the piston rod, and positioning grooves are provided on both sides of the threaded groove inside the piston rod.

[0011] Preferably, the positioning assembly includes a transition gear fixedly connected to the top end of the rotating rod, a driving gear is rotatably connected to the inside of the handle, a driving tooth disc is fixedly connected to the surface of the driving gear, the surface of the driving tooth disc is meshingly connected to the surface of the transition gear, the surface of the driving gear is meshingly connected to the surface of the ratchet wheel, a square column is fixedly connected to the inside of the handle, clamping holes are equidistantly provided on the surface of the square column, a positioning plate is slidably connected to the outer surface of the square column, a sliding plate is fixedly connected to the side surface of the positioning plate, and a clamping column is fixedly connected to the top of the positioning plate.

[0012] Preferably, the driving gear is made of rubber. The top of the clamping post is clamped on the surface of the driving gear. The outer surface of the limiting post is inserted into the positioning groove. A square groove matching the square post is penetrated and opened at the center of the surface of the positioning plate. A silica gel block and steel balls are movably installed inside the positioning plate. The surface of the steel ball abuts against the surface of the silica gel block. The surface of the steel ball away from the silica gel block extends into the square groove. The surface of the steel ball is clamped inside the clamping hole.

[0013] Preferably, the negative pressure assembly includes a circular groove opened inside the handle. The inside of the communication groove is connected to the right end inside the circular groove through a communication pipe. A sealing disc is hermetically and slidably connected inside the circular groove. A sealing rod is fixedly connected to the center of the surface of the sealing disc. A pressing disc is fixedly connected to the end face of the sealing rod. An air leakage pipe is fixedly connected inside the handle. A second return spring is movably installed inside the circular groove.

[0014] Preferably, the left end inside the circular groove is connected to the outside of the handle through the air leakage pipe. The outer surface of the sealing rod is hermetically and slidably connected inside the handle.

[0015] Preferably, the outer surface of the clamping rod is inserted into the threaded groove. The inside of the long groove is connected to the inside of the communication groove through a trachea.

[0016] Preferably, the opening component includes a fixed seat fixedly connected to the end face of the hose. A sealing groove is opened inside the fixed seat. A sealing plate is hermetically and slidably connected inside the sealing groove. A connecting rod is fixedly connected to the center of the surface of the sealing plate. A sleeve is fixedly connected to the outer surface of the connecting rod. Rotating plates are rotatably connected to both sides of the outer surface of the sleeve. A sliding column is slidably connected inside the fixed seat. The surface of the rotating plate is rotatably connected to the surface of the sliding column. An abutting plate is fixedly connected to the end face of the sliding column. A limiting groove is opened inside the fixed seat. A limiting block is slidably connected inside the limiting groove.

[0017] Preferably, both the limiting groove and the limiting block are square. The end face of the connecting rod away from the sealing plate is fixedly connected to the surface of the limiting block. The outer surface of the connecting rod is non-hermetically and slidably connected inside the fixed seat. The surface of the abutting plate is arc-shaped. The input end of the pressure gauge is connected to the inside of the plug connector. The inside of the pressurizing chamber is connected to the inside of the sealing groove through the plug connector and the hose.

[0018] (III) Beneficial Effects

[0019] Compared with the prior art, the present invention provides a minimally invasive cervical laminar retractor, which has the following beneficial effects:

[0020] 1. The minimally invasive cervical laminar retractor device, by setting a transmission component and a positioning component, during use, after holding the handle with one hand, only by repeatedly pressing the pressing plate with the thumb, the piston rod can be driven to slide upward inside the pressurizing cavity, and the inside of the sealing groove can be pressurized, so that the abutting plate slides away from the fixed seat, and the specified position can be retracted. After the retraction, through the engagement of the clamping post and the driving gear, the opening position of the abutting plate can be fixed, and the retraction force and degree can be controlled more precisely. Compared with the problem that the laminar retractor is difficult to finely adjust in a narrow space, this design can more accurately complete the retraction operation, meet the high-precision requirements for laminar retraction in minimally invasive surgery, is conducive to improving the success rate and safety of the surgery, greatly simplifies the operation process, reduces the complexity of the doctor's hand operation, can more quickly complete laminar retraction during the surgery, saves precious surgical time.

[0021] 2. The minimally invasive cervical laminar retractor device, by setting a communication groove, a communication pipe and a negative pressure component, when the retractor device needs to be removed after the operation, only by pressing the pressing disc with the thumb, the inside of the long groove can be in a negative pressure state, and the clamping rod can be retracted. When the clamping rod is not connected to the inside of the thread groove, through the elasticity of the limiting spring, the piston rod quickly slides down, the sealing plate slides towards the direction close to the hose, and the two abutting plates quickly contract, which can facilitate the quick removal of the opening component and the hose. This efficient removal method also greatly shortens the time of the final stage of the operation, is conducive to reducing the overall operation time of the patient, reducing the surgical risk, and compared with the complex multi-step operation when removing the traditional retractor device, greatly reduces the operation difficulty and burden of the doctor in removing the retractor device in the later stage of the surgery. Brief Description of the Drawings

[0022] Figure 1 is a schematic structural diagram of the minimally invasive cervical laminar retractor device proposed by the present invention;

[0023] Figure 2 is a cross-sectional view of the handle in the minimally invasive cervical laminar retractor device proposed by the present invention;

[0024] Figure 3 is Figure 2 an enlarged view of part A in

[0025] Figure 4 is Figure 2 an enlarged view of part B in

[0026] Figure 5 is a cross-sectional view of the positioning plate in the minimally invasive cervical laminar retractor device proposed by the present invention;

[0027] Figure 6 is Figure 2 an enlarged view of part C in

[0028] Figure 7Cross-sectional view of the piston rod in the minimally invasive cervical laminar retractor device proposed by the present invention;

[0029] Figure 8 Cross-sectional view of the transfer rod in the minimally invasive cervical laminar retractor device proposed by the present invention;

[0030] Figure 9 Schematic structural diagram of the opening assembly in the minimally invasive cervical laminar retractor device proposed by the present invention;

[0031] Figure 10 Schematic connection diagram of the fixed seat and the abutting plate in the minimally invasive cervical laminar retractor device proposed by the present invention.

[0032] In the figure: 1. Handle; 2. Boosting chamber; 3. Limit post; 4. Piston rod; 41. Positioning groove; 42. Threaded groove; 5. Silicone ring; 6. Plug connector; 7. Pressure gauge; 8. Hose; 9. Opening assembly; 91. Fixed seat; 92. Sealing groove; 93. Sealing plate; 94. Connecting rod; 95. Sleeve; 96. Rotating plate; 97. Sliding column; 98. Abutting plate; 99. Limit groove; 910. Limit block; 10. Driven gear; 11. Rotating rod; 12. Transmission assembly; 121. Fixed bearing; 122. Transfer rod; 1221. Clamping rod; 1222. Rubber sealing disc; 1223. Long groove; 1224. Air pipe; 123. Tooth ring; 124. Tooth belt; 125. Communication groove; 126. Sealing ring; 127. Communication pipe; 13. Positioning assembly; 131. Intermediate gear; 132. Driving gear disc; 133. Driving gear; 134. Square column; 135. Clamping hole; 136. Positioning plate; 1361. Square groove; 1362. Silicone block; 1363. Steel ball; 137. Slide plate; 138. Clamping column; 14. Rotating groove; 141. First return spring; 15. Pressing plate; 16. Ratchet; 17. Limit spring; 18. Negative pressure assembly; 181. Circular groove; 182. Air discharge pipe; 183. Sealing disc; 184. Sealing rod; 185. Pressing disc; 186. Second return spring. Detailed implementation manners

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Apparently, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without any creative efforts shall fall within the protection scope of the present invention.

[0034] Please refer to Figure 1-10, A minimally invasive cervical laminar retractor device, comprising a handle 1. An inflation chamber 2 is provided inside the handle 1. A limit post 3 is fixedly connected inside the inflation chamber 2. A piston rod 4 is slidably connected to the outer surface of the limit post 3. A silicone ring 5 is fixedly connected to the bottom end inside the inflation chamber 2. A plug connector 6 communicating with the inside of the inflation chamber 2 is fixedly connected to the top of the handle 1. A hose 8 is fixedly sleeved on the outer surface of the plug connector 6. A pressure gauge 7 is fixedly installed on the outer surface of the plug connector 6. An opening assembly 9 is installed at the end of the hose 8 away from the plug connector 6. A transmission assembly 12 is installed inside the handle 1. The transmission assembly 12 includes a rotating rod 122 inserted into the center of the piston rod 4. A fixed bearing 121 is fixedly installed at the top end of the outer surface of the rotating rod 122. A toothed ring 123 and a sealing ring 126 are fixedly sleeved on the outer surface of the rotating rod 122. A communication groove 125 is provided inside the handle 1. A communication pipe 127 communicating with the inside of the communication groove 125 is fixedly connected inside the handle 1. A toothed belt 124 is meshed and installed on the outer surfaces of the toothed ring 123 and the driven gear 10. A rotating rod 11 is rotatably connected to the inside of the handle 1 through a positioning bearing. A driven gear 10 is fixedly connected to the end of the rotating rod 11. A positioning assembly 13 is installed at the connection between the top end of the rotating rod 11 and the handle 1. The positioning assembly 13 includes a transition gear 131 fixedly connected to the top end of the rotating rod 11. A driving gear 133 is rotatably connected to the inside of the handle 1. A driving tooth disc 132 is fixedly connected to the surface of the driving gear 133. The surface of the driving tooth disc 132 is meshed with the surface of the transition gear 131. The surface of the driving gear 133 is meshed with the surface of a ratchet 16. A square post 134 is fixedly connected to the inside of the handle 1. Card holes 135 are equidistantly provided on the surface of the square post 134. A positioning plate 136 is slidably connected to the outer surface of the square post 134. A sliding plate 137 is fixedly connected to the side surface of the positioning plate 136. A clamping post 138 is fixedly connected to the top of the positioning plate 136. A rotating groove 14 is provided inside the handle 1. A pressing plate 15 is rotatably connected to the inside of the rotating groove 14. A first return spring 141 is fixedly connected to the inside of the rotating groove 14. The end face of the first return spring 141 is fixedly connected to the surface of the pressing plate 15. A ratchet 16 is fixedly connected to the surface of the pressing plate 15. A limit spring 17 is movably installed inside the inflation chamber 2. A negative pressure assembly 18 is installed inside the handle 1. By setting the transmission assembly 12 and the positioning assembly 13, during use, after holding the handle 1 with one hand, only by repeatedly pressing the pressing plate 15 with the thumb, the piston rod 4 can be driven to slide upward inside the inflation chamber 2, and the inside of the sealing groove 92 can be pressurized, so that the abutting plate 98 slides away from the fixed seat 91, and a specified position can be retracted. And after retraction, through the clamping of the clamping post 138 and the driving gear 133, the retracted position of the abutting plate 98 can be fixed, and the retracting force and degree can be controlled more precisely. Compared with the problem that it is difficult to finely adjust the laminar retractor in a narrow space, this design can achieve a more precise retracting operation, meet the high-precision requirements of minimally invasive cervical spine surgery, and is beneficial to improving the success rate and safety of the surgery.Greatly simplifies the operation process, reduces the complexity of the doctor's hand operations, can complete lamina retraction more quickly during the operation, and saves valuable operation time.

[0035] A long groove 1223 is formed inside the rotating rod 122. A rubber sealing disc 1222 is hermetically and slidably connected inside the long groove 1223. A clamping rod 1221 is fixedly connected to the surface of the rubber sealing disc 1222. An air pipe 1224 communicating with the inside of the long groove 1223 is fixedly connected inside the rotating rod 122. A threaded groove 42 is formed at the center of the inside of the piston rod 4. Positioning grooves 41 are formed on both sides of the threaded groove 42 inside the piston rod 4. By providing a slidable structure of the clamping rod 1221, when the clamping rod 1221 is not connected to the inside of the threaded groove 42, the piston rod 4 automatically slides down by the elasticity of the limiting spring 17. When the clamping rod 1221 extends outside the rotating rod 122, the clamping rod 1221 can drive the piston rod 4 to slide up and down through the engagement with the threaded groove 42. At the same time, the piston rod 4 slides up and down outside the limiting column 3 through the positioning groove 4.

[0036] The driving gear 133 is made of rubber. The top of the clamping column 138 is clamped on the surface of the driving gear 133. The outer surface of the limiting column 3 is inserted into the inside of the positioning groove 41. A square groove 1361 matching the square column 134 is formed through the center of the surface of the positioning plate 136. A silica gel block 1362 and steel balls 1363 are movably installed inside the positioning plate 136. The surface of the steel ball 1363 abuts against the surface of the silica gel block 1362. The surface of the steel ball 1363 away from the silica gel block 1362 extends into the inside of the square groove 1361. The surface of the steel ball 1363 is clamped inside the clamping hole 135. Since the driving gear 133 is made of rubber and cooperates with the engagement of the ratchet 16, when the ratchet 16 rotates counterclockwise, the ratchet 16 will not drive the driving gear 133 to rotate.

[0037] The negative pressure assembly 18 includes a circular groove 181 opened inside the handle 1, the interior of the connecting groove 125 is connected to the right end of the interior of the circular groove 181 through a connecting tube 127, the interior of the circular groove 181 is sealingly and slidably connected with a sealing disc 183, the center of the surface of the sealing disc 183 is fixedly connected with a sealing rod 184, the end surface of the sealing rod 184 is fixedly connected with a pressure plate 185, the interior of the handle 1 is fixedly connected with an air release pipe 182, and the interior of the circular groove 181 is movably installed with a second return spring 186. By setting the connecting groove 125, the connecting tube 127 and the negative pressure assembly 18, when the expansion device needs to be taken out after the operation is completed, it is only necessary to press the pressure plate with the thumb 185, the interior of the long groove 1223 can be in a negative pressure state, and the clamping rod 1221 can be retracted. When the clamping rod 1221 is not connected to the interior of the threaded groove 42, the elasticity of the limit spring 17 can cause the piston rod 4 to slide down quickly, causing the sealing plate 93 to slide toward the direction of the hose 8, and the two abutment plates 98 to shrink quickly, so that the opening component 9 and the hose 8 can be quickly removed. This efficient removal method greatly shortens the time of the final stage of the operation, which is beneficial to reducing the overall operation time of the patient and reducing the surgical risk. Compared with the cumbersome operation of removing the traditional distraction device, it greatly reduces the difficulty and burden of the doctor in removing the distraction device in the later stage of the operation.

[0038] The inner left end of the circular groove 181 is connected to the outside of the handle 1 through the air vent pipe 182, and the outer surface of the sealing rod 184 is sealingly and slidingly connected to the inside of the handle 1. Since the outer surface of the sealing rod 184 is sealingly and slidingly connected to the inside of the handle 1, the air tightness of the inner right end of the circular groove 181 can be ensured.

[0039] The outer surface of the clamping rod 1221 is inserted into the interior of the threaded groove 42 , and the interior of the long groove 1223 is connected to the interior of the connecting groove 125 through the air pipe 1224 .

[0040] The opening component 9 includes a fixed seat 91 fixedly connected to the end face of the hose 8, a sealing groove 92 is provided inside the fixed seat 91, a sealing plate 93 is sealingly and slidably connected inside the sealing groove 92, a connecting rod 94 is fixedly connected at the center of the surface of the sealing plate 93, a sleeve 95 is fixedly connected to the outer surface of the connecting rod 94, and rotating plates 96 are rotatably connected to both sides of the outer surface of the sleeve 95, a sliding column 97 is slidably connected inside the fixed seat 91, the surface of the rotating plate 96 is rotatably connected to the surface of the sliding column 97, and a stop plate 98 is fixedly connected to the end face of the sliding column 97, a limiting groove 99 is provided inside the fixed seat 91, and a limiting block 910 is slidably connected inside the limiting groove 99. By setting the opening component 9, the opening and closing action of the stop plate 98 is realized by changing the air pressure inside the sealing groove 92.

[0041] The limiting groove 99 and the limiting block 910 are both square. The end face of the connecting rod 94 away from the sealing plate 93 is fixedly connected to the surface of the limiting block 910. The outer surface of the connecting rod 94 is non-sealingly and slidably connected inside the fixed seat 91. The surface of the pressing plate 98 is arc-shaped. The input end of the pressure gauge 7 is communicated with the inside of the plug connector 6. The inside of the pressurizing chamber 2 is communicated with the inside of the sealing groove 92 through the plug connector 6 and the hose 8. Since the limiting groove 99 and the limiting block 910 are both square, the connecting rod 94 can be prevented from rotating.

[0042] In summary, for this minimally invasive cervical laminar retractor device, when placing it, through the hose 8, the opening assembly 9 is placed at the specified position. Then, by sliding the slide plate 137 downward, the slide plate 137 drives the clamping post 138 to slide downward through the positioning plate 136. At this time, the driving gear 133 can rotate. When using it, after holding the handle 1 with one hand, the pressing plate 15 is repeatedly pressed by the thumb. Due to the meshing of the ratchet 16 and the driving gear 133, when the pressing plate 15 rotates into the rotating groove 14, the ratchet 16 can drive the driving gear 133 to rotate. Then, through the elasticity of the first return spring 141, the rotation of the pressing plate 15 is reset. At this time, the ratchet 16 will not drive the driving gear 133 to rotate. When the driving gear 133 rotates, it drives the rotating rod 11 to rotate through the driving gear disk 132 and the intermediate gear 131. The rotating rod 11 drives the rotating rod 122 to rotate through the driven gear 10, the toothed belt 124, and the toothed ring 123. The rotating rod 122 drives the clamping rod 1221 to rotate inside the threaded groove 42 and drives the piston rod 4 to slide upward. Then, through the pressurizing chamber 2, the plug connector 6, and the hose 8, the inside of the sealing groove 92 is pressurized. At this time, the sealing plate 93 drives the connecting rod 94 to slide, and through the rotation of the rotating plate 96, the pressing plate 98 is driven to slide away from the fixed seat 91 through the sliding column 97, so as to be able to retract the specified position. After retracting, by sliding the slide plate 137 upward, the clamping post 138 is clamped with the driving gear 133. At this time, the surface of the steel ball 1363 is clamped inside the clamping hole 135 at the uppermost part of the surface of the square column 134. Therefore, the opening position of the pressing plate 98 can be fixed, and the retracting force and degree can be controlled more precisely. Compared with the problem that it is difficult to finely adjust the laminar retractor in a narrow space, this design can achieve a more precise retracting operation, meet the high-precision requirements of minimally invasive cervical spine surgery, is beneficial to improving the success rate and safety of the surgery, greatly simplifies the operation process, reduces the complexity of the doctor's hand operation, can complete the laminar retraction more quickly during the surgery, and saves precious surgical time.

[0043] When the expansion device needs to be removed after the operation is completed, it is only necessary to press the pressure plate 185 with the thumb. At this time, the right end of the circular groove 181 is in a negative pressure state, and the connecting pipe 127 makes the long groove 1223 in a negative pressure state, and the clamping rod 1221 is retracted. When the clamping rod 1221 is not connected to the inside of the threaded groove 42, the elasticity of the limit spring 17 makes the piston rod 4 slide down quickly. After the piston rod 4 slides down, the top of the boost chamber 2 is in a negative pressure state, and the top of the sealing groove 92 is in a negative pressure state. The sealing plate 93 drives the sleeve 95 to slide through the connecting rod 94, and the sleeve 95 drives the rotating plate 96 to rotate, so that the two abutment plates 98 shrink quickly, which can facilitate the rapid removal of the opening component 9 and the hose 8. This efficient removal method greatly shortens the time of the closing stage of the operation, which is beneficial to reducing the overall operation time of the patient and reducing the surgical risk. Compared with the complicated multi-step operation when removing the traditional expansion device, it greatly reduces the difficulty and burden of the doctor in removing the expansion device in the later stage of the operation.

[0044] 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 minimally invasive cervical vertebral lamina distraction device, comprising a handle (1), characterized in that: A boost chamber (2) is provided inside the handle (1), a limiting column (3) is fixedly connected inside the boost chamber (2), a piston rod (4) is slidably connected to the outer surface of the limiting column (3), a silicone ring (5) is fixedly connected to the inner bottom end of the boost chamber (2), a plug connector (6) which is connected to the inner part of the boost chamber (2) is fixedly connected to the top of the handle (1), a hose (8) is fixedly sleeved on the outer surface of the plug connector (6), a pressure gauge (7) is fixedly installed on the outer surface of the plug connector (6), an opening component (9) is installed on the end of the hose (8) away from the plug connector (6), a transmission component (12) is installed inside the handle (1), and the interior of the handle (1) rotates through a positioning bearing A rotating rod (11) is connected, the end of the rotating rod (11) is fixedly connected to a driven gear (10), a positioning assembly (13) is installed at the connection between the top end of the rotating rod (11) and the handle (1), a rotating groove (14) is opened inside the handle (1), a pressure plate (15) is rotatably connected inside the rotating groove (14), a first return spring (141) is fixedly connected inside the rotating groove (14), the end face of the first return spring (141) is fixedly connected to the surface of the pressure plate (15), the surface of the pressure plate (15) is fixedly connected to a ratchet (16), a limit spring (17) is movably installed inside the boost chamber (2), and a negative pressure assembly (18) is installed inside the handle (1).

2. The minimally invasive cervical vertebra laminae distraction device according to claim 1, characterized in that: The transmission assembly (12) comprises a rotating rod (122) inserted at the center of the piston rod (4), a fixed bearing (121) is fixedly installed on the top of the outer surface of the rotating rod (122), a toothed ring (123) and a sealing ring (126) are fixedly sleeved on the outer surface of the rotating rod (122), a connecting groove (125) is opened inside the handle (1), a connecting pipe (127) connected to the inside of the connecting groove (125) is fixedly connected inside the handle (1), and a toothed belt (124) is meshedly installed on the outer surface of the toothed ring (123) and the driven gear (10).

3. The minimally invasive cervical vertebral lamina distraction device according to claim 2, characterized in that: The rotating rod (122) is provided with a long groove (1223) inside, and the long groove (1223) is sealingly and slidably connected to a rubber sealing disk (1222) inside, and a clamping rod (1221) is fixedly connected to the surface of the rubber sealing disk (1222), and the rotating rod (122) is fixedly connected to an air pipe (1224) connected to the inside of the long groove (1223), and a thread groove (42) is provided at the center of the piston rod (4), and positioning grooves (41) are provided inside the piston rod (4) on both sides of the thread groove (42).

4. The minimally invasive cervical vertebra laminae distraction device according to claim 1, characterized in that: The positioning assembly (13) comprises a transition gear (131) fixedly connected to the top of the rotating rod (11); the handle (1) is internally rotatably connected to a driving gear (133); the surface of the driving gear (133) is fixedly connected to a driving toothed disc (132); the surface of the driving toothed disc (132) is meshedly connected to the surface of the transition gear (131); the surface of the driving gear (133) is meshedly connected to the surface of the ratchet (16); the handle (1) is internally fixedly connected to a square column (134); the surface of the square column (134) is provided with clamping holes (135) at equal intervals; the outer surface of the square column (134) is slidably connected to a positioning plate (136); the side of the positioning plate (136) is fixedly connected to a slide plate (137); the top of the positioning plate (136) is fixedly connected to a clamping column (138).

5. The minimally invasive cervical vertebra laminae distraction device according to claim 4, characterized in that: The driving gear (133) is made of rubber. The top of the clamping column (138) is clamped on the surface of the driving gear (133). The outer surface of the limiting column (3) is inserted into the interior of the positioning groove (41). A square groove (1361) matching the square column (134) is provided through the center of the surface of the positioning plate (136). A silicone block (1362) and a steel ball (1363) are movably installed inside the positioning plate (136). The surface of the steel ball (1363) is against the surface of the silicone block (1362). The steel ball (1363) extends away from the surface of the silicone block (1362) to the interior of the square groove (1361). The surface of the steel ball (1363) is clamped in the interior of the clamping hole (135).

6. The minimally invasive cervical vertebral lamina distraction device according to claim 3, characterized in that: The negative pressure component (18) comprises a circular groove (181) opened inside the handle (1); the interior of the connecting groove (125) is connected to the right end of the circular groove (181) through a connecting pipe (127); the interior of the circular groove (181) is sealingly and slidably connected to a sealing disc (183); a sealing rod (184) is fixedly connected to the center of the surface of the sealing disc (183); the end surface of the sealing rod (184) is fixedly connected to a pressure plate (185); the interior of the handle (1) is fixedly connected to an air release pipe (182); and a second return spring (186) is movably installed inside the circular groove (181).

7. The minimally invasive cervical vertebra laminae distraction device according to claim 6, characterized in that: The inner left end of the circular groove (181) is connected to the outside of the handle (1) through the air release pipe (182), and the outer surface of the sealing rod (184) is sealingly slidably connected to the inside of the handle (1).

8. The minimally invasive cervical vertebra laminae distraction device according to claim 6, characterized in that: The outer surface of the clamping rod (1221) is inserted into the interior of the threaded groove (42), and the interior of the long groove (1223) is connected to the interior of the connecting groove (125) through the air pipe (1224).

9. The minimally invasive cervical vertebra laminae distraction device according to claim 1, characterized in that: The opening assembly (9) comprises a fixed seat (91) fixedly connected to the end face of the hose (8); a sealing groove (92) is provided inside the fixed seat (91); a sealing plate (93) is sealingly and slidably connected inside the sealing groove (92); a connecting rod (94) is fixedly connected at the center of the surface of the sealing plate (93); a sleeve (95) is fixedly connected to the outer surface of the connecting rod (94); rotating plates (96) are rotatably connected to both sides of the outer surface of the sleeve (95); a sliding column (97) is slidably connected inside the fixed seat (91); the surface of the rotating plate (96) is rotatably connected to the surface of the sliding column (97); a stop plate (98) is fixedly connected to the end face of the sliding column (97); a limiting groove (99) is provided inside the fixed seat (91); a limiting block (910) is slidably connected inside the limiting groove (99).

10. The minimally invasive cervical vertebra laminae distraction device according to claim 9, characterized in that: The limiting groove (99) and the limiting block (910) are both square, the end face of the connecting rod (94) away from the sealing plate (93) is fixedly connected to the surface of the limiting block (910), the outer surface of the connecting rod (94) is non-sealed and slidably connected to the inside of the fixed seat (91), the surface of the abutment plate (98) is arc-shaped, the input end of the pressure gauge (7) is connected to the inside of the plug connector (6), and the inside of the boost chamber (2) is connected to the inside of the sealing groove (92) through the plug connector (6) and the hose (8).

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