A multi-dimensional spinal distraction device

Abstract

This invention belongs to the field of medical device technology and relates to a multi-dimensional spinal expansion device, which includes a connecting rod (1), a first connector (3), a second connector (5), and an expansion rod (7). The first connector (3) is connected to the lower end of the connecting rod (1) and can rotate relative to the lower end of the connecting rod (1). The second connector (5) is connected to the first connector (3) and can swing relative to the first connector (3). The expansion rod (7) is mounted on the second connector (5) and can move up and down along the second connector (5), thereby enabling the expansion rod (7) to be adjusted in multiple dimensions relative to the connecting rod (1). It can adaptively match the endplate angle, fit fully, and bear pressure evenly. It can effectively expand the anterior column / anterior mid-section of the vertebral body through the posterior approach, is compatible with multiple approaches, can reduce the risk of endplate damage, slippage, and collapse, and improve the accuracy and safety of surgery. It is suitable for spinal interbody fusion surgery.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology and relates to a spinal expansion device, particularly a multi-dimensional spinal expansion device. Background Technology

[0002] In spinal interbody fusion surgery, intervertebral space relaxation is a crucial step in restoring intervertebral height, reconstructing the physiological sequence of the spine, and creating operative space for fusion cage implantation. Existing spinal relaxation devices are mostly fixed-angle, single-line relaxation structures, which have significant shortcomings in clinical use: 1. There is often an angle difference or pathological tilt between the upper and lower vertebral endplates, making it difficult for the fixed structure to fully conform to the endplate, easily creating localized pressure points, leading to endplate damage, collapse, or device slippage; 2. During posterior approach procedures, the relaxation force is concentrated in the posterior region of the intervertebral space, making it difficult to effectively act on the anterior column / anterior-middle region of the vertebral body, resulting in insufficient restoration of intervertebral height and affecting surgical outcomes; 3. There are no quantitative markers or repeatable positioning structures for the relaxation angle and insertion depth, making operation dependent on the surgeon's experience, easily leading to over- or under-extension, and low accuracy in fusion cage selection; 4. The applicable approach is limited, and different surgical scenarios such as posterior and lateral (OLIF) require different specialized instruments, resulting in poor adaptability, cumbersome operation, and increased surgical time and cost.

[0003] To address the aforementioned shortcomings, this invention provides a spinal dispersive device that is multi-dimensionally adjustable, precisely quantifiable, versatile across multiple access routes, and efficiently protects the endplate. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, this invention proposes a multi-dimensional spinal expansion device that can adaptively match the endplate angle, ensure sufficient fit and uniform pressure, and effectively expand the anterior column / anterior mid-section of the vertebral body via the posterior approach. It is compatible with multiple approaches, reduces the risk of endplate damage, slippage, and collapse, and improves surgical precision and safety. It is suitable for spinal interbody fusion surgery.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A multi-dimensional spinal expansion device includes a connecting rod, characterized in that it further includes a first connector, a second connector, and an expansion rod. The first connector is connected to the lower end of the connecting rod and is rotatable relative to the lower end of the connecting rod. The second connector is connected to the first connector and is oscillating relative to the first connector. The expansion rod is mounted on the second connector and is movable up and down along the second connector, thereby enabling the expansion rod to be adjusted in multiple dimensions relative to the connecting rod.

[0006] Preferably, the first connector is connected to the lower end of the connecting rod via a pressure ring and a limiter. The lower end of the connecting rod has a transverse bend with an internal thread. The lower end of the first connector has a first through hole and a toothed ring surrounding the first through hole. The limiter includes a rod body with an external thread at one end and a toothed disc at the other end. The rod body passes through the first through hole, and the external thread engages with the internal thread. The teeth on the toothed disc can mesh with the toothed ring. The pressure ring is sleeved on the outside of the transverse bend and the rod body, and a top ring is provided on the inner side of the pressure ring. A first spring is also sleeved on the rod body between the top ring and the inner end of the transverse bend. Under the pushing action of the first spring, the pressure ring is pushed outward, and the pressure ring pushes the first connector outward, thereby causing the teeth on the toothed disc to mesh with the toothed ring. Pressing the connecting rod and the first connector overcomes the pushing force of the first spring, causing the teeth on the toothed disc to disengage from the toothed ring, thereby allowing the first connector to rotate relative to the lower end of the connecting rod.

[0007] Preferably, the lower end of the first connector is further provided with a cover plate hole coaxial with the first through hole, and a cover plate is provided inside the cover plate hole.

[0008] Preferably, the upper end of the first connector is provided with a first longitudinal through hole, a meshing through hole communicating with the first longitudinal through hole, and a connecting lug. An adjusting rod is provided in the first longitudinal through hole. The first connector and the second connector are rotatably connected by a connecting pin passing through the connecting lug. One end of the second connector is provided with an arc-shaped meshing tooth ring, and the arc-shaped meshing tooth ring passes through the meshing through hole and meshes with the worm gear on the adjusting rod. By rotating the adjusting rod, the arc-shaped meshing tooth ring can be driven to rotate, thereby realizing the swing of the second connector relative to the first connector.

[0009] Preferably, the upper end of the first connector is further provided with a first longitudinal positioning hole communicating with the first longitudinal through hole, and the adjustment rod can be limited by the first positioning pin passing through the first longitudinal positioning hole.

[0010] Preferably, the second positioner has a second longitudinal through hole and a third longitudinal through hole, which are connected by a limiting bead hole and a limiting bead is provided in the limiting bead hole. A lever is provided in the second longitudinal through hole, and the expansion rod is disposed in the third longitudinal through hole. The expansion rod has a plurality of spherical grooves along the longitudinal direction that cooperate with the limiting bead on its expansion rod body. The lever body of the lever has a limiting bead recessed ring that can cooperate with the limiting bead. By moving the lever up and down, the limiting bead cooperates with different spherical grooves, thereby realizing the up and down movement of the expansion rod along the second connector.

[0011] Preferably, the lower end of the bead lever is further provided with a second spring, which can push the bead lever upward to prevent the limiting bead concave ring from aligning with the limiting bead.

[0012] Preferably, the upper end of the second positioner is further provided with a second longitudinal positioning hole communicating with the second longitudinal through hole, and the ball-handling rod can be limited by the second positioning pin passing through the second longitudinal positioning hole.

[0013] Preferably, the second connector has an angle indicator scale on its side, which can indicate the swing angle of the second connector relative to the first connector.

[0014] Preferably, the support rod is provided with a height indicator scale, which can indicate the vertical movement distance of the support rod along the second connector.

[0015] Compared with the prior art, the multidimensional spinal dispersing device of the present invention has one or more of the following beneficial technical effects: 1. This invention can adjust the posture in multiple dimensions, and can still fully fit the end plate and provide stable support when there is angular misalignment between the upper and lower end plates, thereby reducing the risk of local pressure, slippage and end plate damage.

[0016] 2. This invention can optimize the direction of the dispersing force transmission, meeting the clinical needs of the posterior approach, making the dispersing effect more likely to cover the anterior column / anterior middle region of the vertebral body, thus being more conducive to the restoration of intervertebral height and sagittal improvement, and reducing the shortcomings of traditional dispersing which tends to favor the middle and posterior regions and is difficult to dissect the anterior column.

[0017] 3. This invention enables quantitative display and repeatable positioning of the opening angle and insertion depth, allowing surgeons to control the opening angle and insertion depth more consistently, thereby reducing the risk of over- or under-extension, improving the accuracy of fusion device specification selection, and enhancing the consistency of intraoperative image comparison.

[0018] 4. This invention has stronger multi-access adaptability and can better meet the operational needs of different directions such as lateral channels (similar to the channel direction characteristics in OLIF scenarios), thereby improving the clinical coverage of the same retractor system and reducing the need to change instruments.

[0019] 5. This invention can improve the uniformity of endplate pressure, reduce unit pressure, enhance the endplate protection effect for osteoporosis patients, and reduce the risk of intraoperative collapse and postoperative settlement. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the multi-dimensional spinal stretching device of the present invention; Figure 2 yes Figure 1 A sectional view is provided to more clearly show its internal structure; Figure 3 This is a schematic diagram of the connecting rod of the multi-dimensional spinal expansion device of the present invention; Figure 4 This is a schematic diagram of the structure of the first connector of the multi-dimensional spinal expansion device of the present invention; Figure 5 This is a schematic diagram of the structure of the limiter of the multi-dimensional spinal expansion device of the present invention; Figure 6 This is a schematic diagram of the pressure ring structure of the multi-dimensional spinal expansion device of the present invention; Figure 7 This is a schematic diagram of the structure of the adjusting rod of the multi-dimensional spinal expansion device of the present invention; Figure 8 This is a schematic diagram of the structure of the second connector of the multi-dimensional spinal expansion device of the present invention; Figure 9 This is a schematic diagram of the second connector of the multi-dimensional spinal expansion device of the present invention from another angle; Figure 10 This is a schematic diagram of the structure of the beaded rod of the multi-dimensional spinal expansion device of the present invention; Figure 11 This is a schematic diagram of the structure of the support rod of the multi-dimensional spinal support device of the present invention; Figure 12 This is a schematic diagram of the adjustment of the multi-dimensional spinal stretching device of the present invention after the first connector rotates relative to the connecting rod; Figure 13 This is a schematic diagram of the adjustment of the multi-dimensional spinal stretching device of the present invention after the second connector swings relative to the first connector; Figure 14 This is a schematic diagram of the adjustment of the multi-dimensional spinal stretching device of the present invention after the stretching rod moves up and down relative to the second connector; Figure 15 This is a schematic diagram of the multi-dimensional spinal stretching device of the present invention in use. Detailed Implementation

[0021] Before detailing any embodiment of the invention, it should be understood that the invention, in its application, is not limited to the details of the construction and arrangement of the components set forth in the following description or illustrated in the following figures. The invention can have other embodiments and can be practiced or carried out in various ways. Furthermore, it should be understood that the wording and terminology used herein are for descriptive purposes and should not be considered limiting. The use of “comprising” or “having” and variations thereof is intended to cover the items set forth below and their equivalents, as well as any additional items. Unless otherwise specified or limited, the terms “installation,” “connection,” “support,” and “linkage,” and variations thereof are used broadly and cover both direct and indirect installation, connection, support, and linking. Moreover, “connection” and “linkage” are not limited to physical or mechanical connections or links.

[0022] Furthermore, firstly, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting this invention. Secondly, the term "a" should be understood as "at least one" or "one or more," that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple. The term "a" should not be construed as a limitation on the quantity.

[0023] Figure 1 A schematic diagram of the multi-dimensional spinal expansion device of the present invention is shown. Figure 1 As shown, the multidimensional spinal expansion device of the present invention includes a connecting rod 1, a first connector 3, a second connector 5, and an expansion rod 6.

[0024] The first connector 3 is connected to the lower end of the connecting rod 1 and is rotatable relative to the lower end of the connecting rod 1. Therefore, by rotating the first connector 3 relative to the connecting rod 1, the multi-dimensional spinal expansion device of the present invention can be... Figure 1 The state shown has changed to Figure 12 The state shown.

[0025] The second connector 5 is connected to the first connector 3 and is oscillating relative to the first connector 3. Thus, by oscillating the second connector 5 relative to the first connector 3, the multi-dimensional spinal stretching device of the present invention can be... Figure 1 The state shown has changed to Figure 13 The state shown.

[0026] The expansion rod 7 is mounted on the second connector 5 and can move up and down along the second connector 5. Thus, by moving the expansion rod 7 up and down relative to the second connector 5, the multi-dimensional spinal expansion device of the present invention can be... Figure 1 The state shown has changed to Figure 14 The state shown.

[0027] Therefore, the multi-dimensional spinal expansion device of the present invention enables the expansion rod 7 to be adjusted in multiple dimensions relative to the connecting rod 1, so that it can still fully fit the endplate and provide stable support when there is angular misalignment between the upper and lower endplates, thereby reducing the risk of local pressure, slippage and endplate damage.

[0028] like Figure 2 As shown, in this invention, the first connector 3 is connected to the lower end of the connecting rod 1 via a pressure ring 8 and a limiter 9, so that the first connector 3 can rotate relative to the lower end of the connecting rod 1.

[0029] Among them, such as Figure 3 As shown, the lower end of the connecting rod 1 is provided with a transverse bend 101. Furthermore, as... Figure 2 As shown, the transverse bend 101 has an internal thread.

[0030] like Figure 4 As shown, the lower end of the first connector 3 is provided with a first through hole 301 and a toothed ring 303 arranged around the first through hole 301.

[0031] like Figure 5 As shown, the limiter 9 includes a rod 901, one end of which is provided with an external thread 902, and the other end is provided with a toothed disc 903. The inner side of the toothed disc 903 is provided with teeth 904.

[0032] like Figure 6 As shown, the pressure ring 8 includes an outer ring body 801 and a top ring 802 located inside the outer ring body 801. A perforation 803 is formed in the top ring 802.

[0033] like Figure 2 As shown, the rod 901 passes through the first through hole 301 and through hole 803, and the external thread 902 engages with the internal thread, thereby detachably connecting the limiter 9 to the connecting rod 1. Simultaneously, this allows the teeth 904 on the gear disc 903 to mesh with the gear ring 303. Furthermore, the pressure ring 8 is sleeved on the outside of the transverse bend 101 and the rod 901. A first spring 2 is also sleeved on the rod 901, located between the top ring 802 and the inner end of the transverse bend 101.

[0034] Therefore, under the pushing force of the first spring 2, the pressure ring 8 is pushed outward, and the pressure ring 8 pushes the first connector 3 outward, causing the teeth 904 on the gear disc 903 to mesh with the gear ring 303, thereby fixing the first connector 3 relative to the connecting rod 1. After pressing the connecting rod 1 and the first connector 3 to overcome the pushing force of the first spring 2, the teeth 904 on the gear disc 903 disengage from the gear ring 303, allowing the first connector 3 to rotate relative to the lower end of the connecting rod 1. At this time, the multi-dimensional spinal expansion device of the present invention can be... Figure 1 The state shown has changed to Figure 13 The state shown.

[0035] Preferably, such as Figure 2 and 4 As shown, the lower end of the first connector 3 is also provided with a cover plate hole 302 coaxial with the first through hole 301. A cover plate 10 is provided inside the cover plate hole 302.

[0036] Continue to refer to Figure 4 The upper end of the first connector 3 is provided with a first longitudinal through hole 304, a meshing through hole 305 communicating with the first longitudinal through hole 304, and a connecting lug 306. The connecting lug 306 is provided with a first connecting hole 307.

[0037] like Figure 8 As shown, one end of the second connector 5 is provided with an arc-shaped meshing toothed ring 501 and the second connector 5 is provided with a second connection hole 504.

[0038] like Figure 1 and 2 As shown, an adjusting rod 4 is provided inside the first longitudinal perforation 304. Furthermore, as... Figure 7 As shown, the upper end of the adjusting rod 4 is provided with an adjusting knob 401, and the lower end is provided with a worm gear 402.

[0039] The first connector 3 and the second connector 5 are rotatably connected by a connecting pin 15 passing through the first connecting hole 307 and the second connecting hole 504. Furthermore, the arc-shaped meshing toothed ring 501 can pass through the meshing through hole 305 and mesh with the worm gear 402 on the adjusting rod 4.

[0040] Therefore, by rotating the adjustment knob 402, the adjustment rod 4 can be rotated, and the rotation of the worm gear 402 drives the arc-shaped meshing toothed ring 501 to rotate, thereby realizing the swinging of the second connector 5 relative to the first connector 3. At this time, the multi-dimensional spinal expansion device of the present invention can be... Figure 1 The state shown has changed to Figure 13 The state shown.

[0041] Preferably, such as Figure 4 As shown, the upper end of the first connector 3 is also provided with a first longitudinal positioning hole 308 communicating with the first longitudinal through hole 304. Thus, the adjustment rod 4 can be limited by the first positioning pin 13 passing through the first longitudinal positioning hole 308.

[0042] Continue to refer to Figure 8 The second positioner 5 is provided with a second longitudinal perforation 502 and a third longitudinal perforation 503. For example... Figure 9 As shown, the second longitudinal perforation 502 and the third longitudinal perforation 503 are connected by a limiting bead hole 507 and are as follows: Figure 2 As shown, a limiting bead 12 is provided in the limiting bead hole 507. A bead-pulling rod 6 is provided in the second longitudinal through hole 502. The spreading rod 7 is disposed in the third longitudinal through hole 503.

[0043] like Figure 10 As shown, the upper end of the bead lever 6 is provided with an operation knob 603, and the bead lever body 601 of the bead lever 6 is provided with a limiting bead concave ring 602 that can cooperate with the limiting bead 12.

[0044] like Figure 11 As shown, the spreading rod 7 has a plurality of spherical grooves 703 along the longitudinal direction on the spreading rod body 701 that cooperate with the limiting bead 12, and the lower end of the spreading rod 7 has a spreading piece 702.

[0045] Therefore, under the pushing action of the beading rod body 601 of the beading rod 6, the limiting bead 12 cooperates with the spherical groove 703 on the spreading rod body 701 to fix the spreading rod 7 relative to the second connector 5. When it is necessary to adjust the spreading rod 7 up and down, the beading rod 6 is pushed down by the operating knob 603, so that the limiting bead concave ring 602 is aligned with the limiting bead 12. At this time, the limiting bead 12 is no longer pushed by the beading rod body 601 of the beading rod 6, so that the limiting bead 12 can disengage from the spherical groove 703 on the spreading rod body 701, and thus the spreading rod 7 can move up and down along the second connector 5. After adjustment, align the limiting bead 12 with the spherical groove 703 on the spreading rod 701, and pull the lever 6 upward using the operating knob 603 (or under the elastic force of the second spring 11 described later). This causes the limiting bead concave ring 602 to no longer align with the limiting bead 12. Under the pushing action of the lever 601, the limiting bead 12 and the spherical groove 703 on the spreading rod 701 are re-engaged, thus re-fixing the spreading rod 7. In this way, by moving the lever 6 up and down to engage the limiting bead 12 with different spherical grooves 703, the spreading rod 7 can move up and down along the second connector 5, thereby enabling the multi-dimensional spinal spreading device of the present invention to... Figure 1 The state shown has changed to Figure 14 The state shown.

[0046] Preferably, such as Figure 2 As shown, a second spring 11 is also provided at the lower end of the ball-shifting rod 6. The second spring 11 can push the ball-shifting rod 6 upward to prevent the limiting bead concave ring 602 from aligning with the limiting bead 12.

[0047] More preferably, such as Figure 8 and 9 As shown, the upper end of the second positioner 5 is also provided with a second longitudinal positioning hole 505 communicating with the second longitudinal through hole 502. Thus, the second positioning pin 14 passing through the second longitudinal positioning hole 505 can achieve the limiting of the ball-handling rod 6.

[0048] Furthermore, in this invention, preferably, the front and rear sides of the second connector 5 are provided with angle indicating scales 506. Thus, the angle indicating scales 506 can indicate the swing angle of the second connector 5 relative to the first connector 3.

[0049] More preferably, the extension rod 7 is provided with a height indicator scale. Thus, the height indicator scale can indicate the vertical movement distance of the extension rod 7 along the second connector 5.

[0050] like Figure 15 As shown, when using the multi-dimensional spinal expansion device A of the present invention for spinal expansion, two multi-dimensional spinal expansion devices A are used in combination and are symmetrically arranged. The upper end of the connecting rod 1 of each multi-dimensional spinal expansion device A is connected to the existing expander B, and the expansion plate 702 at the lower end of the expansion rod 7 is inserted between the vertebrae C that need to be expanded. When the expansion plate 702 at the lower end of the expansion rod 7 is inserted between the vertebrae C that need to be expanded, the posture of the expansion rod 7 can be adjusted in multiple dimensions during insertion. That is, press the first connector 3 and the pressure ring 8 axially, rotate and adjust until the expansion plate 702 fits the endplate, and release to automatically lock; rotate the adjustment knob 401, observe the angle indicator scale 506, and fine-tune until the expansion force points to the anterior column / anterior mid-zone of the vertebral body; press the operation knob 603 of the bead lever 6 to adjust the insertion length of the expansion rod 7, observe the height scale, and then release the lock. Once inserted, the spreader B drives one of the multi-dimensional spinal spreading devices A to move laterally, thereby spreading the spine.

[0051] This invention can adaptively match the endplate angle, ensuring sufficient fit and uniform pressure. The posterior approach can effectively open the anterior column / anterior mid-section of the vertebral body. It is compatible with multiple approaches, reduces the risk of endplate damage, slippage, and collapse, and improves surgical precision and safety. It is suitable for interbody fusion surgery in spinal surgery.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the present invention. Those skilled in the art can modify or make equivalent substitutions to the technical solutions of the present invention based on the concept of the present invention, without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A multi-dimensional spinal expansion device, comprising a connecting rod (1), characterized in that, It also includes a first connector (3), a second connector (5) and a spreading rod (7). The first connector (3) is connected to the lower end of the connecting rod (1) and can rotate relative to the lower end of the connecting rod (1). The second connector (5) is connected to the first connector (3) and can swing relative to the first connector (3). The spreading rod (7) is mounted on the second connector (5) and can move up and down along the second connector (5), so that the spreading rod (7) can be adjusted in multiple dimensions relative to the connecting rod (1).

2. The multidimensional spinal expansion device according to claim 1, characterized in that, The first connector (3) is connected to the lower end of the connecting rod (1) via a pressure ring (8) and a limiter (9). The lower end of the connecting rod (1) is provided with a transverse bend (101) and an internal thread is provided in the transverse bend (101). The lower end of the first connector (3) is provided with a first through hole (301) and a toothed ring (303) arranged around the first through hole (301). The limiter (9) includes a rod body (901) with an external thread (902) at one end and a toothed disc (903) at the other end. The rod body (901) passes through the first through hole (301) and the external thread (902) engages with the internal thread. The teeth (904) on the toothed disc (903) can mesh with the toothed ring (303). The pressure ring (8) is sleeved on the transverse bend. A top ring (802) is provided on the outside of the head (101) and the rod (901) and on the inside of the pressure ring (8). A first spring (2) is also sleeved on the rod (901) between the top ring (802) and the inner end of the transverse bend (101). Under the pushing action of the first spring (2), the pressure ring (8) is pushed outward and the first connector (3) is pushed outward through the pressure ring (8). This causes the teeth (904) on the gear plate (903) to mesh with the gear ring (303). The connecting rod (1) and the first connector (3) are pressed to overcome the pushing force of the first spring (2). This causes the teeth (904) on the gear plate (903) to disengage from the gear ring (303), thereby allowing the first connector (3) to rotate relative to the lower end of the connecting rod (1).

3. The multi-dimensional spinal expansion device according to claim 2, characterized in that, The lower end of the first connector (3) is also provided with a cover plate hole (302) coaxial with the first through hole (301), and a cover plate (10) is provided in the cover plate hole (302).

4. The multidimensional spinal expansion device according to claim 1, characterized in that, The upper end of the first connector (3) is provided with a first longitudinal through hole (304), a meshing through hole (305) communicating with the first longitudinal through hole (304), and a connecting lug (306). An adjusting rod (4) is provided in the first longitudinal through hole (304). The first connector (3) and the second connector (5) are rotatably connected by a connecting pin (15) passing through the connecting lug (306). One end of the second connector (5) is provided with an arc-shaped meshing toothed ring (501), and the arc-shaped meshing toothed ring (501) passes through the meshing through hole (305) and meshes with the worm gear (402) on the adjusting rod (4). By rotating the adjusting rod (4), the arc-shaped meshing toothed ring (501) can be driven to rotate, thereby realizing the swing of the second connector (5) relative to the first connector (3).

5. The multi-dimensional spinal expansion device according to claim 4, characterized in that, The upper end of the first connector (3) is also provided with a first longitudinal positioning hole (308) that communicates with the first longitudinal through hole (304). The adjustment rod (4) can be limited by the first positioning pin (13) passing through the first longitudinal positioning hole (308).

6. The multidimensional spinal expansion device according to claim 1, characterized in that, The second positioner (5) is provided with a second longitudinal through hole (502) and a third longitudinal through hole (503). The second longitudinal through hole (502) and the third longitudinal through hole (503) are connected by a limiting bead hole (507) and a limiting bead (12) is provided in the limiting bead hole (507). A lever (6) is provided in the second longitudinal through hole (502). The opening rod (7) is provided in the third longitudinal through hole (503) and the opening rod (7) is opened. The rod body (701) is provided with a plurality of spherical grooves (703) that cooperate with the limiting bead (12) along the longitudinal direction. The bead rod body (601) of the bead push rod (6) is provided with a limiting bead concave ring (602) that can cooperate with the limiting bead (12). By moving the bead push rod (6) up and down, the limiting bead (12) is made to cooperate with different spherical grooves (703), thereby realizing the up and down movement of the spreading rod (7) along the second connector (5).

7. The multidimensional spinal expansion device according to claim 6, characterized in that, The lower end of the ball-turning rod (6) is also provided with a second spring (11), which can push the ball-turning rod (6) upward to prevent the limiting bead concave ring (602) from being aligned with the limiting bead (12).

8. The multidimensional spinal expansion device according to claim 7, characterized in that, The upper end of the second positioner (5) is also provided with a second longitudinal positioning hole (505) that communicates with the second longitudinal through hole (502). The limit of the ball lever (6) can be achieved by the second positioning pin (14) passing through the second longitudinal positioning hole (505).

9. The multidimensional spinal expansion device according to any one of claims 1-8, characterized in that, The second connector (5) has an angle indicator scale (506) on its side, which can indicate the swing angle of the second connector (5) relative to the first connector (3).

10. The multidimensional spinal expansion device according to any one of claims 1-8, characterized in that, The support rod (7) is provided with a height indicator scale, which can indicate the vertical movement distance of the support rod (7) along the second connector (5).

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