Spinal nerve distraction device

Abstract

The present invention discloses a spinal nerve distraction device, which relates to the technical field of medical devices, and provides a spinal nerve distraction device, including a handheld portion, and a distraction portion connected to the handheld portion, the distraction portion including a symmetrically arranged left distraction structure and a right distraction structure, characterized in that: an upper distraction structure and a lower distraction structure are also provided between the left distraction structure and the right distraction structure; the left distraction structure and the right distraction structure both include a No. 1 distraction block with a groove in the middle, and each No. 1 distraction block has a groove symmetrically provided inside the groove; the upper distraction structure and the lower distraction structure both include a No. 2 distraction block with a channel inside, and each No. 2 distraction block has an extension block inside the channel; a linkage structure for driving the two No. 2 distraction blocks to distract is provided between the two No. 1 distraction blocks. The present invention can distract muscle and fat tissue from four directions, observe and expose tumors, and smoothly complete the operation of removing tumors.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a spinal nerve distraction device. Background Art

[0002] Paraspinal tumors and extraforaminal neurogenic tumors are often located beside the vertebral body, or beside the vertebral body and on the ventral side of the vertebral body, and are deep in the position. Spinal tumor resection is commonly performed with traditional surgical methods. The main operation process includes incision, exposure and resection of the posterior vertebral attachments, treatment of one segment of the spine, exposure and resection of the vertebral body, removal of the tumor, intervertebral bone grafting, posterior spinal fixation, and wound hemostasis.

[0003] Vertebral exposure and resection require the use of a posterior spinal dilator or lamina retractor to pull the tissue around the vertebral body. However, the depth of the posterior spinal dilator is often insufficient, the commonly used lamina retractor is not long enough, and two assistants are required for retraction, making it inconvenient for the surgeon to operate.

[0004] Publication (announcement) number (CN 220801058 U) and a distraction device for lumbar surgery

[0005] The utility model comprises a left clamp body and a right clamp body, wherein the middle parts of the left clamp body and the right clamp body are hinged by a pin shaft, the left clamp blade at the upper part of the left clamp body is connected with a connecting handle, the bottom of the connecting handle is connected with a positioning rod matched with the pedicle screw, the right clamp blade at the upper part of the right clamp body is connected with a round rod, a positioning plate is rotatably connected to the round rod, a positioning sleeve hole matched with the pedicle screw is provided on the side of the positioning plate away from the round rod, a left clamp handle at the lower part of the left clamp body is provided with a left finger ring, and a right clamp handle at the lower part of the right clamp body is provided with a right finger ring; the utility model not only limits the mobility of the pedicle screw head to avoid it blocking the surgical field by arranging the positioning rod matched with the pedicle screw and the positioning sleeve hole matched with the pedicle screw, and then by spreading the left clamp blade and the right clamp blade, it is possible to not only limit the mobility of the pedicle screw head to avoid it blocking the surgical field, but also spread the wound by supporting the pedicle screw, and no single-tooth retractor is needed, thereby avoiding muscle ischemia and necrosis.

[0006] However, this application only has expansion structures in the left and right directions, and the expansion field of view is relatively narrow, which may limit the doctor's surgical field of view and affect the patient's surgical process. Summary of the invention

[0007] In view of the above-mentioned problems, the present invention aims to provide a spinal nerve distraction device that can distract muscles and fat tissues from four directions, observe and expose tumors, and smoothly complete the operation of removing tumors.

[0008] The main idea of ​​the technical solution adopted by the present invention is as follows: when performing paraspinal tumor resection, a distraction device is needed to distract the tissue around the vertebral body so as to expose the tumor and facilitate the doctor to remove the tumor. However, the existing distraction device only has distraction structures in the left and right directions, and the distraction field of view is relatively narrow, which may limit the doctor's surgical field of view. Therefore, the present application enlarges the distraction range of the distraction device by providing an upper distraction structure and a lower distraction structure between the left distraction structure and the right distraction structure, so as to facilitate the doctor to observe and remove the tumor.

[0009] In order to make it more convenient and labor-saving to use, the present application also sets a linkage structure between the expansion structures in the upper and lower directions, and connects the linkage structure with the expansion structures in the left and right directions, so that the expansion structures in the left and right directions are linked with the expansion structures in the upper and lower directions, thereby enabling doctors to save time and labor when using it. Doctors only need to use the hand-held part to expand the expansion structures in the left and right directions, and the expansion structures in the upper and lower directions can be linked with it to expand, which is labor-saving and convenient.

[0010] In order to make the expansion range larger, the present application also arranges extension blocks on the expansion structure in the upper and lower directions. The extension blocks are arranged around the expansion blocks of the expansion structure in the upper and lower directions, which can make the expansion range larger and the exposure effect better.

[0011] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0012] A spinal nerve distraction device comprises a handheld portion and a distraction portion connected to the handheld portion, wherein the distraction portion comprises a left distraction structure and a right distraction structure symmetrically arranged, and is characterized in that:

[0013] An upper side opening structure and a lower side opening structure are symmetrically arranged between the left side opening structure and the right side opening structure;

[0014] The left-side opening structure and the right-side opening structure are both No. 1 opening blocks with a groove in the middle, and the groove of each No. 1 opening block is symmetrically provided with a slide groove inside;

[0015] The upper side support structure and the lower side support structure are both No. 2 support blocks with channels inside;

[0016] A linkage structure for driving the two No. 2 opening blocks to open is provided between the two No. 1 opening blocks.

[0017] Furthermore, an extension block is provided inside the channel of each of the second support blocks.

[0018] Furthermore, the linkage structure includes two expansion parts symmetrically arranged on the second expansion block, and a connecting shaft located between the two expansion parts and connected to both expansion parts.

[0019] Furthermore, each of the expansion components includes a hollow shaft block located on the inner surface of the second expansion block, and a boss movably connected to the inside of the hollow shaft block, an airbag is arranged below the boss, and the airbag is connected to the channel of the second expansion block.

[0020] Furthermore, two elastic members in opposite directions are wound around the two bosses, and one end of each elastic member is respectively connected to the inner surface of the No. 1 support block in the corresponding direction.

[0021] Furthermore, an extrusion block for extruding the airbag is provided below each of the bosses, and the extrusion block is in contact with the airbag.

[0022] Furthermore, the outer wall of each hollow shaft block is sleeved with a plurality of rotating rings, each rotating ring is symmetrically provided with a plurality of connecting rods, and the other end of each connecting rod is sleeved in a slide groove.

[0023] Furthermore, the rotating ring includes a first rotating ring and a second rotating ring, and the first rotating ring is located above the second rotating ring.

[0024] Furthermore, each of the extension blocks includes a vertical rod passing through the channel of the second support block, and an extension rod located outside the second support block, and the vertical rod is connected to the extension rod.

[0025] Furthermore, the extension block includes a first extension block symmetrically arranged in the transverse direction of the second support block, and a second extension block symmetrically opened in the longitudinal direction of the second support block.

[0026] The beneficial effects of the present invention are as follows: compared with the prior art, the present invention has the following improvements:

[0027] When performing paraspinal tumor resection, a distraction device is needed to distract the tissue around the vertebral body in order to expose the tumor and facilitate the doctor to remove the tumor. However, the existing distraction device only has distraction structures in the left and right directions, and the distraction field of view is relatively narrow, which may limit the doctor's surgical field of view. Therefore, the present application provides an upper distraction structure and a lower distraction structure between the left distraction structure and the right distraction structure to increase the distraction range of the distraction device, thereby facilitating the doctor to observe and remove the tumor.

[0028] In order to make it more convenient and labor-saving to use, the present application also sets a linkage structure between the expansion structures in the upper and lower directions, and connects the linkage structure with the expansion structures in the left and right directions, so that when the expansion structures in the left and right directions move away from each other, the linkage structure can drive the expansion structures in the upper and lower directions to move away from each other to achieve the purpose of expansion, thereby enabling doctors to save time and labor when using it. They only need to use the hand-held part to expand the expansion structures in the left and right directions, and the expansion structures in the upper and lower directions can be linked with it to expand, which is labor-saving and convenient.

[0029] In order to make the expansion range larger, the present application also arranges extension blocks on the expansion structure in the upper and lower directions. The extension blocks are arranged around the No. 2 expansion block of the expansion structure in the upper and lower directions, and each No. 2 expansion block is provided with an extension channel inside, and the extension block is arranged in the extension channel. The extension channel is also connected to an airbag inside. By squeezing the airbag, the airbag inflates the inside of the extension channel, and the air pressure makes the extension block extend outward, thereby making the expansion range larger and the exposure effect better. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the spinal nerve distraction device of the present invention.

[0031] Figure 2 It is a schematic diagram of the left side distraction structure and the right side distraction structure of the spinal nerve distraction device of the present invention.

[0032] Figure 3 This is an enlarged view of part A of the spinal nerve distraction device of the present invention.

[0033] Figure 4 This is a schematic diagram of the left-side distraction structure and the right-side distraction structure of the spinal nerve distraction device of the present invention from another perspective.

[0034] Figure 5 It is a front view of the overall structure of the spinal nerve distraction device of the present invention.

[0035] Figure 6 It is a cross-sectional view of the spinal nerve distraction device of the present invention taken along the AA line.

[0036] Figure 7 It is a cross-sectional view of the spinal nerve distraction device of the present invention taken along the BB axis.

[0037] Figure 8 It is a top view of the overall structure of the spinal nerve distraction device of the present invention.

[0038] Fig. 9 It is a cross-sectional view of the spinal nerve distraction device of the present invention taken along the CC axis.

[0039] Fig.10This is an enlarged view of part B of the spinal nerve distraction device of the present invention.

[0040] Fig.11 This is a schematic structural diagram of the spinal nerve distraction device of the present invention without one hand-held portion and the left distraction structure.

[0041] Fig.12 The present invention is a schematic structural diagram of the spinal nerve distraction device without the hand-held portion, the left distraction structure and the right distraction structure.

[0042] Fig.13 This is a schematic diagram of the overall structure of the spinal nerve distraction device of the present invention from another perspective.

[0043] Fig.14 This is an enlarged view of part C of the spinal nerve distraction device of the present invention.

[0044] Among them: 1. handle, 2. No. 1 expansion block, 3. No. 1 rotating ring, 4. No. 2 expansion block, 5. No. 2 rotating ring, 6. connecting shaft, 7. rotating shaft, 8. slide groove, 9. groove, 10. sliding sleeve, 11. elastic rope, 12. No. 2 extension block, 13. No. 1 connecting rod, 14. No. 1 extension block, 15. No. 1 channel, 16. No. 2 channel, 17. hollow shaft block, 18. boss, 19. airbag, 20. No. 2 connecting rod, 21. extrusion block. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0046] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0047] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0048] In the description of this application, it should be noted that the terms "center", "upper", "lower", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0049] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0050] In the description of the present application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two elements.

[0051] For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0052] Paraspinal tumors and extraforaminal neurogenic tumors are often located beside the vertebral body, or beside the vertebral body and on the ventral side of the vertebral body, and are deep in the position. Spinal tumor resection is commonly performed with traditional surgical methods. The main operation process includes incision, exposure and resection of the posterior vertebral attachments, treatment of one segment of the spine, exposure and resection of the vertebral body, removal of the tumor, intervertebral bone grafting, posterior spinal fixation, and wound hemostasis.

[0053] Vertebral exposure and resection require the use of a posterior spinal dilator or lamina retractor to pull the tissue around the vertebral body. However, the depth of the posterior spinal dilator is often insufficient, the commonly used lamina retractor is not long enough, and two assistants are required for retraction, making it inconvenient for the surgeon to operate.

[0054] Therefore, in order to solve the above problems, the present application discloses a spinal nerve distraction device, which can expand the distraction range and facilitate doctors to observe and remove tumors. Figure 1-Figure 14 , and the text description section of this application.

[0055] When performing paraspinal tumor resection, a distraction device is needed to distract the tissue around the vertebral body so as to expose the tumor and facilitate the doctor to remove the tumor. Therefore, the spinal nerve distraction device of the present application includes a handheld portion and a distraction portion connected to the handheld portion, the distraction portion includes a symmetrically arranged left distraction structure and a right distraction structure, and an upper distraction structure and a lower distraction structure are further arranged between the left distraction structure and the right distraction structure;

[0056] Among them, the hand-holding part is a crossed clamp-like structure with two handles 1, and the crossed parts are connected together by a rotating shaft 7. Each handle 1 can rotate around the rotating shaft 7. The specific structure of the rotating shaft 7 can be the support shaft in the middle of the scissors. The rotating shaft 7 and the support shaft are both existing products, and their use methods are also existing technologies, which will not be elaborated here.

[0057] The left-side opening structure and the right-side opening structure both include a No. 1 opening block 2 with a groove 9 in the middle, and a slide groove 8 is symmetrically provided above and below the groove 9 of each No. 1 opening block 2;

[0058] Both the upper and lower expansion structures include a No. 2 expansion block 4 with a channel inside, and an extension block is provided inside the channel of each No. 2 expansion block 4; the extension block is a T-shaped structure, the transverse part of the extension block is parallel to the No. 2 expansion block 4, and the longitudinal part is arranged inside the channel of the No. 2 expansion block 4. The extension block can expand the support range of the No. 2 expansion block 4, so that the tumor is exposed more fully.

[0059] In order to make it more convenient and labor-saving to use, the present application also sets a linkage structure between the expansion structures in the upper and lower directions, and connects the linkage structure with the expansion structures in the left and right directions, so that the expansion structures in the left and right directions are linked with the expansion structures in the upper and lower directions, thereby enabling doctors to save time and labor when using it. Doctors only need to use the hand-held part to expand the expansion structures in the left and right directions, and the expansion structures in the upper and lower directions can be linked with it to expand, which is labor-saving and convenient.

[0060] More specifically, a linkage structure for driving the two No. 2 expansion blocks 4 to expand is provided between the two No. 1 expansion blocks 2 of the present application. The linkage structure includes two expansion parts symmetrically arranged on the No. 2 expansion block 4, a connecting shaft 6 located between the two expansion parts and connected to both expansion parts, and two elastic members wound on the boss 18, one end of the two elastic members is respectively connected to the inner surface of the No. 1 expansion block 2 in the corresponding direction. It should be noted that the elastic member is an elastic rope 11.

[0061] When the medical staff uses the distraction device of the present application, they place their hands on the handle 1 of the hand-held part, and through the opening action of the hands, drive the rotating shaft 7 to rotate, so that the two No. 1 distraction blocks 2 move away from each other. At the same time, the No. 1 connecting rod 13 and the No. 2 connecting rod 20 in the two No. 1 distraction blocks 2 move in the corresponding slide groove 8, so that the straight-line distance between the No. 1 connecting rod 13 and the No. 2 connecting rod 20 becomes closer and closer, and then the distance between the two No. 1 distraction blocks 2 becomes farther and farther, and the tissue around the vertebral body is distracted in the left and right directions. At this time, while the No. 1 distraction blocks 2 move away from each other, the two elastic ropes 11 wrapped around the boss 18 will also be tightened as the distance between the two No. 1 distraction blocks 2 increases. When the tension is too tight to be tightened, the boss 18 will be driven to rotate. Due to the pulling effect of the two elastic ropes 11, the elastic ropes 11 drive the distraction component to distract the No. 2 distraction block 4.

[0062] More specifically, each expansion component includes a hollow shaft block 17 located on the inner surface of the lower expansion structure, and a boss 18 connected to the inner thread of the hollow shaft block 17. A squeezing block 21 for squeezing the airbag 19 is symmetrically arranged below the boss 18. The squeezing block 21 is fixedly connected to the boss 18, and as shown in FIG. Fig.10 As shown, the cross-sectional view of the extrusion block 21 is an L-shaped structure, and an airbag 19 is also arranged below the boss 18. The airbag 19 is fixedly connected to the hollow shaft block 17. The cross-sectional view of the airbag 19 is an inverted L-shaped structure. The extrusion block 21 is buckled with the boss 18, and the airbag 19 is connected to the channel of the No. 2 expansion block 4.

[0063] The outer wall of each hollow shaft block 17 is sleeved with a plurality of rotating rings, and each rotating ring is symmetrically provided with a plurality of connecting rods, and the other end of each connecting rod is sleeved in the slide groove 8. The slide groove 8 is sleeved with a plurality of connecting rods, including a No. 1 connecting rod 13 and a No. 2 connecting rod 20 symmetrically arranged at the upper and lower ends of the left and right No. 1 support blocks 2, and the No. 1 connecting rod 13 is located above the No. 2 connecting rod 20. The No. 1 connecting rod 13 and the No. 2 connecting rod 20 are sleeved on one end of the slide groove 8 and are fixedly connected with a sliding sleeve 10, so that the connecting rods slide more smoothly in the slide groove 8. The other ends of the No. 1 connecting rod 13 and the No. 2 connecting rod 20 are connected to the rotating ring arranged on the outside of the boss 18. Since the two No. 1 expansion blocks 2 in the present application are symmetrical, and each No. 1 expansion block 2 is provided with two upper and lower slide grooves 8, each slide groove 8 is sleeved with the No. 1 connecting rod 13 and the No. 2 connecting rod 20, and the movement trajectories of the No. 1 connecting rod 13 and the No. 2 connecting rod 20 in the same slide groove 8 are opposite, therefore, in order to enable the No. 1 connecting rod 13 and the No. 2 connecting rod 20 to move in opposite directions, the two No. 1 expansion blocks 2 are driven toward each other through the opposite movement trajectories of the No. 1 connecting rod 13 and the No. 2 connecting rod 20. The rotating ring of the present application includes a No. 1 rotating ring 3 fixedly connected to the No. 1 connecting rod 13, and a No. 2 rotating ring 5 fixedly connected to the No. 2 connecting rod 20. The No. 1 rotating ring 3 is located above the No. 2 rotating ring 5, and the No. 1 rotating ring 3 and the No. 2 rotating ring 5 are both sleeved on the outside of the hollow shaft block 17. A bearing matching the inner diameters of the No. 1 rotating ring 3 and the No. 2 rotating ring 5 is arranged on the outside of the hollow shaft block 17, so that the No. 1 rotating ring 3 and the No. 2 rotating ring 5 can rotate around the bearing, thereby allowing the No. 1 connecting rod 13 and the No. 2 connecting rod 20 to move in the slide groove 8.

[0064] It should be noted that the boss 18 is also hollow and fixedly connected to the connecting shaft 6 .

[0065] In order to make the expansion range larger, the present application also arranges extension blocks on the No. 2 expansion block 4 in the upper and lower directions. The extension blocks are arranged around the expansion blocks of the expansion structure in the upper and lower directions, which can make the expansion range larger and the exposure effect better.

[0066] Each No. 2 support block 4 is provided with extension blocks around its periphery, and each extension block includes a vertical rod passing through the inside of the No. 2 support block 4 and an extension rod located outside the No. 2 support block 4 .

[0067] The extension block includes a first extension block 14 symmetrically arranged in the horizontal direction of the second opening block 4, and a second extension block 12 symmetrically opened in the longitudinal direction of the second opening block 4. The first extension block 14 and the second extension block 12 are both connected to corresponding extension channels. The first extension block 14 corresponds to the first channel 15, and the second extension block 12 corresponds to the second channel 16.

[0068] When the two No. 1 expansion blocks 2 are expanded and move away from each other, the elastic rope 11 wrapped around the boss 18 will also be tightened as the distance between the two No. 1 expansion blocks 2 increases. When it is tightened to the point where it can no longer be tightened, it will drive the boss 18 to rotate. The inside of the boss 18 is connected to the connecting shaft 6 through two bearings, and the outside of the boss 18 is threadedly connected to the inside of the hollow shaft block 17. The boss 18 can only rotate in place and cannot rotate out of its original position. Therefore, when the elastic rope 11 drives When the boss 18 rotates, it will drive the bearing to rotate, and the connecting shaft 6 connected to the bearing will move outward under the drive of the bearing. When moving, since the hollow shaft block 17 and the airbag 19 are fixedly connected, the hollow shaft block 17 will drive the airbag 19 to move outward together. Since the extrusion block 21 and the boss 18 are fixedly connected, when the hollow shaft block 17 drives the airbag 19 to move outward, the extrusion block 21 does not move, and the airbag 19 and the extrusion block 21 are interlocked, such as Fig.10 As shown, therefore, the stationary squeezing block 21 will be squeezed by the moving airbag 19, causing the airbag 19 to inflate the No. 1 channel 15 and the No. 2 channel 16, and the air pressure will cause the No. 1 extension block 14 and the No. 2 extension block 12 to extend outward, increasing the expansion range.

[0069] More preferably, the length of the extension block in each direction of the second expansion block 4 can be specifically set according to the required expansion range, and even the length of the extension block in each direction that can be extended can be set to different lengths. Since each extension block includes a vertical rod located in the extension channel and an extension rod located outside the extension channel. If it is necessary to set extension blocks of different lengths, it is only necessary to set the length of the vertical rod located in the extension channel to different lengths.

[0070] Example 1

[0071] Paraspinal tumors and extraforaminal neurogenic tumors are often located beside the vertebral body, or beside the vertebral body and on the ventral side of the vertebral body, and are deep in the position. Spinal tumor resection is commonly performed with traditional surgical methods. The main operation process includes incision, exposure and resection of the posterior vertebral attachments, treatment of one segment of the spine, exposure and resection of the vertebral body, removal of the tumor, intervertebral bone grafting, posterior spinal fixation, and wound hemostasis.

[0072] Vertebral exposure and resection require the use of a posterior spinal dilator or lamina retractor to pull the tissue around the vertebral body. However, the depth of the posterior spinal dilator is often insufficient, the commonly used lamina retractor is not long enough, and two assistants are required for retraction, making it inconvenient for the surgeon to operate.

[0073] In order to solve the above-mentioned problem, the present application discloses a spinal nerve distraction device. When the medical staff uses the distraction device of the present application, they place their hands on the handle 1 of the hand-held part, and through the opening action of the hands, drive the rotating shaft 7 to rotate, so that the two No. 1 distraction blocks 2 move away from each other. At the same time, the No. 1 connecting rod 13 and the No. 2 connecting rod 20 in the two No. 1 distraction blocks 2 move in the corresponding slide groove 8, so that the straight-line distance between the No. 1 connecting rod 13 and the No. 2 connecting rod 20 becomes closer and closer, and then the distance between the two No. 1 distraction blocks 2 becomes farther and farther, thereby distracting the tissue around the vertebral body in the left and right directions.

[0074] Example 2

[0075] The use process and method of this embodiment are the same as those of Example 1. The only difference is that in order to make the expansion range larger, the present application also provides extension blocks on the No. 2 expansion block 4 in the upper and lower directions. The extension blocks are arranged around the expansion blocks of the expansion structure in the upper and lower directions. The lengths that the extension blocks can extend are the same. The extension blocks can make the expansion range larger and the exposure effect better.

[0076] When the two No. 1 expansion blocks 2 are expanded and move away from each other, the elastic rope 11 wrapped around the boss 18 will also be tightened as the distance between the two No. 1 expansion blocks 2 increases. When it is tightened to the point where it can no longer be tightened, it will drive the boss 18 to rotate. The inside of the boss 18 is connected to the connecting shaft 6 through two bearings, and the outside of the boss 18 is threadedly connected to the inside of the hollow shaft block 17. The boss 18 can only rotate in place and cannot rotate out of its original position. Therefore, when the elastic rope 11 drives When the boss 18 rotates, it will drive the bearing to rotate, and the connecting shaft 6 connected to the bearing will move outward under the drive of the bearing. When moving, since the hollow shaft block 17 and the airbag 19 are fixedly connected, the hollow shaft block 17 will drive the airbag 19 to move outward together. Since the extrusion block 21 and the boss 18 are fixedly connected, when the hollow shaft block 17 drives the airbag 19 to move outward, the extrusion block 21 does not move, and the airbag 19 and the extrusion block 21 are interlocked, such as Fig.10 As shown, therefore, the stationary squeezing block 21 will be squeezed by the moving airbag 19, causing the airbag 19 to inflate the No. 1 channel 15 and the No. 2 channel 16, and the air pressure will cause the No. 1 extension block 14 and the No. 2 extension block 12 to extend outward, increasing the expansion range.

[0077] Example 3

[0078] The use process and method of this embodiment are the same as those of the first embodiment, the only difference being that the length of the extension block in each direction of the second expansion block 4 can be specifically set according to the required expansion range, and even the length of the extension block in each direction that can be extended can be set to different lengths. Since each extension block includes a vertical rod located in the extension channel and an extension rod located outside the extension channel. If it is necessary to set extension blocks of different lengths, it is only necessary to set the length of the vertical rod located in the extension channel to different lengths.

[0079] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A spinal nerve distraction device, comprising a handheld portion and a distraction portion connected to the handheld portion, wherein the distraction portion comprises a left distraction structure and a right distraction structure symmetrically arranged, characterized in that: An upper side opening structure and a lower side opening structure are symmetrically arranged between the left side opening structure and the right side opening structure; The left-side opening structure and the right-side opening structure are both No. 1 opening blocks (2) with a groove (9) in the middle, and the groove (9) of each No. 1 opening block (2) is symmetrically provided with a slide groove (8) inside. The upper side support structure and the lower side support structure are both No. 2 support blocks (4) with channels provided inside; A linkage structure for driving the two No. 2 opening blocks (4) to open is provided between the two No. 1 opening blocks (2); The linkage structure comprises two expansion parts symmetrically arranged on the second expansion block (4), and a connecting shaft (6) located between the two expansion parts and connected to both expansion parts; Each of the expansion components comprises a hollow shaft block (17) located on the inner surface of the second expansion block (4), and a boss (18) movably connected to the inside of the hollow shaft block (17), an air bag (19) is arranged below the boss (18), and the air bag (19) is connected to the channel of the second expansion block (4); Two elastic members in opposite directions are wound around the two bosses (18), and one end of each elastic member is connected to the inner surface of the No. 1 expansion block (2) in the corresponding direction; A squeezing block (21) for squeezing the airbag (19) is provided below each boss (18), and the squeezing block (21) is in contact with the airbag (19).

2. A spinal nerve distraction device according to claim 1, characterized in that: An extension block is provided inside the channel of each of the second support blocks (4).

3. A spinal nerve distraction device according to claim 2, characterized in that: The outer wall of each hollow shaft block (17) is sleeved with a plurality of rotating rings, each rotating ring is symmetrically provided with a plurality of connecting rods, and the other end of each connecting rod is sleeved in a sliding groove (8).

4. A spinal nerve distraction device according to claim 3, characterized in that: The rotating ring comprises a first rotating ring (3) and a second rotating ring (5), wherein the first rotating ring (3) is located above the second rotating ring (5).

5. A spinal nerve distraction device according to claim 4, characterized in that: Each of the extension blocks comprises a vertical rod penetrating the interior of the passage of the second support block (4), and an extension rod located outside the second support block (4), wherein the vertical rod is connected to the extension rod.

6. A spinal nerve distraction device according to claim 5, characterized in that: The extension block comprises a first extension block (14) symmetrically arranged in the transverse direction of the second support block (4), and a second extension block (12) symmetrically opened in the longitudinal direction of the second support block (4).

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