阅读说明：本技术 椎间融合器 (Intervertebral fusion device ) 是由 赵军 李文钊 张晓永 董骧 于 2020-05-15 设计创作，主要内容包括：本发明提出一种椎间融合器,包含主体、两个支撑板以及撑开组件。主体具有内腔、上开口和下开口。两个支撑板分别设置于上开口和下开口,支撑板与主体滑动配合而能相对主体撑开。撑开组件包含螺杆及两组齿轮轴。螺杆沿第一水平方向可旋转地设置于内腔。两组齿轮轴分别位于螺杆的上方和下方,每组齿轮轴包含至少一根齿轮轴,齿轮轴沿垂直于第一水平方向的第二水平方向可旋转地设置于内腔,齿轮轴设置有沿第二水平方向间隔分布的齿轮和顶推臂,齿轮与螺杆啮合,顶推臂沿齿轮轴的径向延伸。其中,椎间融合器被配置为能够经由螺杆旋转带动两组齿轮轴同步旋转,两组齿轮轴的顶推臂分别顶推两个支撑板相对主体在竖直方向移动。(The invention provides an intervertebral fusion cage, which comprises a main body, two supporting plates and a strutting assembly. The body has an interior cavity, an upper opening, and a lower opening. The two supporting plates are respectively arranged at the upper opening and the lower opening, and the supporting plates are in sliding fit with the main body and can be propped open relative to the main body. The strutting component comprises a screw and two gear shafts. The screw rod is rotatably arranged in the inner cavity along a first horizontal direction. Two sets of gear shafts are located the top and the below of screw rod respectively, and every group gear shaft contains an at least gear shaft, and the gear shaft sets up in the inner chamber rotatably along the second horizontal direction of the first horizontal direction of perpendicular to, and the gear shaft is provided with along second horizontal direction interval distribution's gear and top push arm, gear and screw rod meshing, and top push arm is along the radial extension of gear shaft. The interbody fusion cage is configured to be capable of driving two groups of gear shafts to rotate synchronously through rotation of the screw rod, and the pushing arms of the two groups of gear shafts respectively push the two supporting plates to move in the vertical direction relative to the main body.)

1. An intervertebral cage, comprising:

the device comprises a main body, a handle and a control device, wherein the main body is provided with an inner cavity, and the top and the bottom of the main body are respectively provided with an upper opening and a lower opening which are communicated with the inner cavity;

the two supporting plates are respectively arranged at the upper opening and the lower opening, and the supporting plates are in sliding fit with the main body and can be propped open relative to the main body; and

a distraction assembly comprising:

the screw rod is rotatably arranged in the inner cavity along a first horizontal direction; and

the two groups of gear shafts are respectively positioned above and below the screw rod, each group of gear shafts comprises at least one gear shaft, the gear shafts are rotatably arranged in the inner cavity along a second horizontal direction perpendicular to the first horizontal direction, the gear shafts are provided with gears and pushing arms which are distributed at intervals along the second horizontal direction, the gears are meshed with the screw rod, and the pushing arms extend along the radial direction of the gear shafts;

the interbody fusion cage can drive the two gear shafts to synchronously rotate through the rotation of the screw rod, and the pushing arms of the two gear shafts respectively push the two supporting plates to move in the vertical direction relative to the main body.

2. An intersomatic cage according to claim 1, characterized in that the surface of the support plate facing the main body is provided with a slide block, the main body being provided with a slide groove extending in a vertical direction, the slide block being in sliding engagement with the slide groove.

3. An intersomatic cage according to claim 2, characterized in that the support plate is provided with a plurality of pairs of said sliders, which pairs are spaced apart in a first horizontal direction and two of said sliders of the same pair are spaced apart in a second horizontal direction; the main body is provided with a plurality of pairs of sliding chutes which are arranged at intervals along a first horizontal direction, and two sliding chutes of the same pair are arranged at intervals along a second horizontal direction; the sliding blocks are in sliding fit with the sliding grooves in a one-to-one corresponding mode.

4. An intersomatic cage according to claim 3, characterized in that the two support plates are provided with an equal number of sliders in a one-to-one correspondence; the two supporting plates share the plurality of sliding grooves, and each sliding groove is in sliding fit with the two corresponding sliding blocks respectively belonging to the two supporting plates.

5. An intersomatic cage according to claim 4, wherein the body has two side walls parallel in the second horizontal direction, the sliding grooves being provided in the two side walls, respectively.

6. An intersomatic cage according to claim 2, characterized in that the surface of the support plate facing the body is convexly provided with a boss, the outer circumferential shape of which matches the shape of the upper and lower openings, facing the body; wherein, the slider sets up in the periphery of boss.

7. An intersomatic cage according to claim 1, wherein each set of gear shafts comprises a plurality of said gear shafts spaced apart along the first horizontal direction.

8. An intersomatic cage according to claim 1, wherein each of the gear shafts is provided with a plurality of the pushing arms, a part of which is located on one side of the gear in the first horizontal direction and another part of which is located on the other side of the gear in the first horizontal direction.

9. An intersomatic cage according to claim 1, wherein the body has two side walls parallel in the second horizontal direction, the body being provided with a pair of shaft holes corresponding to each of the gear shafts, the shaft holes of the same pair being oppositely disposed on the two side walls, respectively; wherein, the both ends of gear shaft rotatably set up respectively in two of the same pair the shaft hole.

10. An intersomatic cage according to claim 9, characterized in that the gear shaft is provided at both ends with respective retaining rings to retain the gear shaft between the two shaft holes in the second horizontal direction.

Technical Field

The invention relates to the technical field of spinal thoracolumbar interbody fusion, in particular to an interbody fusion cage.

Background

In the equipment for repairing or correcting the skeleton, compared with other products, the spine product has the characteristics of rich product types, and various diseases and approaches. The interbody fusion cage products can be classified into cervical vertebra fusion cages and thoracolumbar vertebra fusion cages according to different types of applicable vertebral bodies. The existing intervertebral fusion cage starts from an early bone block type structure, and a titanium alloy fusion cage, a peek (poly-ether-ether-ketone) fusion cage and a 3D printing fusion cage are used in the development and evolution process. Above-mentioned all kinds of current design all belong to through designing different specifications, and select suitable length and width height to come the complex product in the art, lead to product specification diversified, can't adapt to the intervertebral space of co-altitude not. Therefore, the intervertebral fusion cage which can be opened is produced. However, the existing intervertebral fusion cage capable of being opened generally has the defects of complex structure, complex operation, incapability of realizing high self-locking and the like.

Disclosure of Invention

It is a primary object of the present invention to overcome at least one of the above-mentioned drawbacks of the prior art and to provide an intervertebral cage which is simple in structure, easy and convenient to operate, and capable of achieving a high degree of self-locking.

In order to achieve the purpose, the invention adopts the following technical scheme:

according to one aspect of the present invention, an intervertebral cage is provided. Wherein, the intervertebral cage comprises a main body, two supporting plates and a strutting component. The main part has an inner cavity, the top and the bottom of main part be provided with respectively communicate in the upper shed and the lower opening of inner cavity. The two supporting plates are respectively arranged at the upper opening and the lower opening, and the supporting plates are in sliding fit with the main body and can be propped open relative to the main body. The strutting component comprises a screw and two gear shafts. The screw rod is rotatably arranged in the inner cavity along a first horizontal direction. The two sets of gear shafts are respectively located above and below the screw rod, each set of gear shaft comprises at least one gear shaft, the gear shafts are rotatably arranged in the inner cavity along a second horizontal direction perpendicular to the first horizontal direction, the gear shafts are provided with gears and pushing arms which are distributed at intervals along the second horizontal direction, the gears are meshed with the screw rod, and the pushing arms extend along the radial direction of the gear shafts. The interbody fusion cage can drive the two gear shafts to synchronously rotate through the rotation of the screw rod, and the pushing arms of the two gear shafts respectively push the two supporting plates to move in the vertical direction relative to the main body.

According to one embodiment of the invention, the surface of the support plate facing the main body is provided with a slide block, the main body is provided with a slide groove extending in a vertical direction, and the slide block is in sliding fit with the slide groove.

According to one embodiment of the invention, the supporting plate is provided with a plurality of pairs of the sliding blocks, the plurality of pairs of the sliding blocks are arranged at intervals along a first horizontal direction, and two sliding blocks of the same pair are arranged at intervals along a second horizontal direction; the main part is provided with a plurality of pairs of chutes, the plurality of pairs of chutes are arranged at intervals along a first horizontal direction, and the chutes are arranged at intervals along a second horizontal direction. The sliding blocks are in sliding fit with the sliding grooves in a one-to-one corresponding mode.

According to one embodiment of the present invention, the number of the sliding blocks arranged on the two supporting plates is equal and corresponds to one another. The two supporting plates share the plurality of sliding grooves, and each sliding groove is in sliding fit with the two corresponding sliding blocks respectively belonging to the two supporting plates.

According to one embodiment of the present invention, the main body has two side walls parallel in the second horizontal direction, and the plurality of sliding grooves are respectively provided in the two side walls.

According to one embodiment of the present invention, a surface of the support plate facing the main body is provided with a boss protruding toward the main body, and the outer circumferential shape of the boss matches the shape of the upper opening and the lower opening. Wherein, the slider sets up in the periphery of boss.

According to one embodiment of the present invention, each of the gear shafts includes a plurality of the gear shafts, and the plurality of the gear shafts are spaced apart in the first horizontal direction.

According to one embodiment of the present invention, each of the gear shafts is provided with a plurality of the pushing arms, a part of which is located at one side of the gear in the first horizontal direction, and another part of which is located at the other side of the gear in the first horizontal direction.

According to one embodiment of the present invention, the main body has two side walls parallel in the second horizontal direction, and a pair of shaft holes are respectively provided in the main body corresponding to each gear shaft, and the two shaft holes of the same pair are respectively oppositely provided in the two side walls. Wherein, the both ends of gear shaft rotatably set up respectively in two of the same pair the shaft hole.

According to one embodiment of the present invention, two ends of the gear shaft are respectively provided with a retainer ring to limit the gear shaft between the two shaft holes in the second horizontal direction.

According to the technical scheme, the intervertebral fusion device has the advantages and positive effects that:

the invention provides an intervertebral fusion device which comprises a main body, two supporting plates and a strutting component. The strutting component comprises a screw and two gear shafts. The two groups of gear shafts are respectively positioned above and below the screw rod, the gear shafts are provided with gears and pushing arms which are distributed at intervals, and the gears are meshed with the screw rod. In view of the above, can drive two sets of gear shafts synchronous revolution through the adjusting screw rotation, the top arm that pushes away of two sets of gear shafts pushes away the relative main part of two backup pads respectively and removes in vertical direction. Through the design, the interbody fusion cage provided by the invention has the advantages of simple structure and simplicity and convenience in operation while synchronously expanding the upper supporting plate and the lower supporting plate. In addition, the matching design of the screw and the gear shaft is adopted to realize the distraction function, and the meshing characteristic of the screw and the gear also ensures that the invention has the self-locking function.

Drawings

Various objects, features and advantages of the present invention will become more apparent from the following detailed description of preferred embodiments of the invention, when considered in conjunction with the accompanying drawings. The drawings are merely exemplary of the invention and are not necessarily drawn to scale. In the drawings, like reference characters designate the same or similar parts throughout the different views. Wherein:

FIG. 1 is an exploded schematic view of an intervertebral cage according to an exemplary embodiment;

FIG. 2 is a front view of the body of the intervertebral cage shown in FIG. 1;

FIG. 3 is a top view of the body of the intervertebral cage shown in FIG. 1;

FIG. 4 is a left side view of the body of the intervertebral cage shown in FIG. 1;

FIG. 5 is a front view of the upper support plate of the intervertebral cage shown in FIG. 1;

FIG. 6 is a top view of the upper support plate of the intervertebral cage shown in FIG. 1;

FIG. 7 is a left side view of the upper support plate of the intersomatic cage shown in FIG. 1;

FIG. 8 is a front view of a lower support plate of the intervertebral cage shown in FIG. 1;

FIG. 9 is a top view of the lower support plate of the intervertebral cage shown in FIG. 1;

FIG. 10 is a left side view of a lower support plate of the intervertebral cage shown in FIG. 1;

FIG. 11 is a front view of the screw of the intervertebral cage shown in FIG. 1;

FIG. 12 is a front view of a gear shaft of the intervertebral cage shown in FIG. 1;

FIG. 13 is a left side view of the gear shaft of the intersomatic cage shown in FIG. 1;

FIG. 14 is a front view of a retaining ring of the intervertebral cage shown in FIG. 1;

fig. 15 is a front view of the locking pin of the intervertebral cage shown in fig. 1.

The reference numerals are explained below:

100. a main body;

110. a side wall;

111. a chute;

112. an upper shaft hole;

113. a lower shaft hole;

114. an upper communicating groove;

115. a lower communicating groove;

120. a first end wall;

121. a first adjustment aperture;

122. a locking hole;

123. a locking pin;

124. an instrument holding hole;

130. a second end wall;

131. a second adjustment aperture;

200. an upper support plate;

210. an upper slide block;

220. an upper boss;

221. an avoidance groove;

230. an upper through hole;

240. an anti-slip structure;

300. a lower support plate;

310. a lower slide block;

320. a lower boss;

330. a lower through hole;

400. a screw;

410. one-way threads;

420. a screw head;

421. a hexagonal socket structure;

500. a gear shaft;

510. a gear;

520. a pushing arm;

530. a retainer ring;

540. an annular groove;

x. a first horizontal direction;

y. a second horizontal direction;

z, vertical direction.

Detailed Description

Exemplary embodiments that embody features and advantages of the invention are described in detail below. It is to be understood that the invention is capable of other and different embodiments and its several details are capable of modification without departing from the scope of the invention, and that the description and drawings are accordingly to be regarded as illustrative in nature and not as restrictive.

In the following description of various exemplary embodiments of the invention, reference is made to the accompanying drawings, which form a part hereof, and in which are shown by way of illustration various exemplary structures, systems, and steps in which aspects of the invention may be practiced. It is to be understood that other specific arrangements of parts, structures, example devices, systems, and steps may be utilized and structural and functional modifications may be made without departing from the scope of the present invention. Moreover, although the terms "over," "between," "within," and the like may be used in this specification to describe various example features and elements of the invention, these terms are used herein for convenience only, e.g., in accordance with the orientation of the examples described in the figures. Nothing in this specification should be construed as requiring a specific three dimensional orientation of structures in order to fall within the scope of the invention.

Referring to fig. 1, there is representatively illustrated an exploded view of an intervertebral cage in accordance with the present invention. In this exemplary embodiment, the intervertebral cage according to the present invention is explained by taking as an example an intervertebral cage applied to thoracolumbar intervertebral fusion. Those skilled in the art will readily appreciate that numerous modifications, additions, substitutions, deletions, or other changes may be made to the embodiments described below in order to utilize the inventive concepts of the present invention in other types of cages or other settings, and still fall within the scope of the principles of the intervertebral cage set forth herein.

In this embodiment, as shown in fig. 1, the intervertebral cage of the present invention can be placed in the gap between two vertebrae and distract the two vertebrae up and down, respectively. The intervertebral cage mainly comprises a main body 100, two supporting plates and a strutting component. Referring to fig. 2-15 in combination, a front view of the body 100 of the intervertebral cage is representatively illustrated in fig. 2; representatively illustrated in fig. 3 is a top view of the body 100 of the intervertebral cage; representatively illustrated in fig. 4 is a left side view of the body 100 of the intervertebral cage; representatively illustrated in fig. 5 is a front view of an upper support plate 200 of the intervertebral cage; representatively illustrated in fig. 6 is a top view of an upper support plate 200 of the intervertebral cage; representatively illustrated in fig. 7 is a left side view of an upper support plate 200 of the intervertebral cage; representatively illustrated in fig. 8 is a front view of a lower support plate 300 of the intervertebral cage; representatively illustrated in fig. 9 is a top view of a lower support plate 300 of the intervertebral cage; representatively illustrated in fig. 10 is a left side view of a lower support plate 300 of the intervertebral cage; representatively illustrated in fig. 11 is a front view of a threaded rod 400 of an intervertebral cage; representatively illustrated in fig. 12 is a front view of a gear shaft 500 of an intervertebral cage; representatively illustrated in fig. 13 is a left side view of a gear shaft 500 of the intersomatic cage; representatively illustrated in fig. 14 is a front view of a retainer ring 530 of the intervertebral cage; representatively illustrated in fig. 15 is a front view of the locking pin 123 of the intervertebral cage. The structure, connection mode and functional relationship of the main components of the intervertebral cage according to the present invention will be described in detail with reference to the accompanying drawings.

As shown in fig. 1, in the present embodiment, the main body 100 has an inner cavity, and the top and bottom of the main body 100 are provided with an upper opening and a lower opening, respectively, which communicate with the inner cavity, respectively. The two support plates are respectively arranged at the upper opening and the lower opening, and the support plates are in sliding fit with the main body 100 and can be propped open relative to the main body 100. Here, for convenience of understanding and explanation, the support plate disposed at the upper opening is defined as an upper support plate 200, and the support plate disposed at the lower opening is defined as a lower support plate 300. That is, the upper support plate 200 can be moved upward with respect to the body 100 starting from the upper opening, and the lower support plate 300 can be moved downward with respect to the body 100 starting from the lower opening. The distraction assembly mainly includes a screw 400 and two gear shafts. The screw 400 is rotatably disposed in the inner cavity in a first horizontal direction X. Two sets of gear shafts are respectively located above and below the screw 400, and each set of gear shafts includes at least one gear shaft 500 (in the present embodiment, two gear shafts 500 are illustrated as an example). The gear shaft 500 is rotatably disposed in the inner cavity in a second horizontal direction Y perpendicular to the first horizontal direction X, and the gear shaft 500 is provided with gears 510 and push arms 520 spaced apart in the second horizontal direction Y (i.e., an axial direction of the gear shaft 500). The gear 510 is engaged with the one-way thread 410 of the screw 400, and the push arm 520 extends in the radial direction of the gear shaft 500. Accordingly, when the two support plates of the intervertebral fusion cage need to be opened up and down, the screw 400 can be adjusted to rotate, the screw 400 drives the upper and lower gear shafts to rotate synchronously, and the pushing arms 520 of the two gear shafts respectively push the upper and lower support plates to move in the vertical direction relative to the main body 100 along with the rotation of the gear shaft 500. Through the design, the interbody fusion cage provided by the invention has the advantages of simple structure and simplicity and convenience in operation while synchronously expanding the upper supporting plate and the lower supporting plate. Moreover, because the matching design of the screw 400 and the gear shaft 500 is adopted to realize the expanding function, the meshing characteristic of the screw 400 and the gear 510 also enables the invention to have the self-locking function.

Preferably, as shown in fig. 1 to 3, in the present embodiment, the main body 100 has two side walls 110 parallel in the second horizontal direction Y, the main body 100 is provided with a pair of shaft holes corresponding to each gear shaft 500, the shaft holes of the same pair are oppositely disposed on the two side walls 110, and both ends of the gear shaft 500 are rotatably disposed in the shaft holes of the same pair, respectively. Wherein, based on the design that each gear shaft of the present embodiment includes two gear shafts 500 arranged at intervals along the first horizontal direction X, the main body 100 is correspondingly provided with four pairs of shaft holes. Specifically, the four pairs of axle holes include two pairs of upper axle holes 112 and two pairs of lower axle holes 113.

Further, as shown in fig. 1 to 3, based on the design of the upper shaft holes 112, in the present embodiment, two pairs of upper shaft holes 112 are arranged at intervals in the first horizontal direction X, and two pairs of upper shaft holes 112 are respectively provided for the two gear shafts 500 located above the screws 400 to rotate. The two upper shaft holes 112 of the same pair are respectively arranged on the two side walls 110. On the basis, the side wall 110 may preferably be provided with an upper communication groove 114 from the top edge to the bottom, and the lower end of the upper communication groove 114 is communicated with the upper shaft hole 112, so that the upper shaft hole 112 has an incomplete hole type, similar to a hole-groove structure. The remaining hole pattern of the upper shaft hole 112 may preferably be an arc shape, that is, the width of the position where the upper communication groove 114 communicates with the upper shaft hole 112 is smaller than the maximum width (or the hole diameter) of the upper shaft hole 112, thereby enabling the end of the gear shaft 500 to be snapped into the upper shaft hole 112 and enabling the positioning of the gear shaft 500. In addition, the upper communication groove 114 may preferably be an inverted trapezoidal groove type, that is, the width of the notch of the upper communication groove 114 at the top edge of the side wall 110 is greater than the width of the position communicated with the upper shaft hole 112, thereby facilitating the operation during the snapping-in of the gear shaft 500 and providing a guide function. In other embodiments, the upper shaft hole 112 may be formed on the sidewall 110 by a complete hole type, and the present embodiment is not limited thereto.

Further, as shown in fig. 1 to 3, based on the design of the lower shaft holes 113, in the present embodiment, two pairs of lower shaft holes 113 are arranged at intervals in the first horizontal direction X, and two pairs of lower shaft holes 113 are respectively provided for the two gear shafts 500 located below the screw 400 to rotate. The two lower shaft holes 113 of the same pair are respectively provided on the two side walls 110. On the basis, the side wall 110 may preferably be provided with a lower communication groove 115 from the bottom edge upwards, and the upper end of the lower communication groove 115 is communicated with the lower shaft hole 113, so that the lower shaft hole 113 has an incomplete hole type, similar to a hole-groove structure. The remaining hole pattern of the lower shaft hole 113 may preferably be an arc shape, that is, the width of the position where the lower communication groove 115 communicates with the lower shaft hole 113 is smaller than the maximum width (or the hole diameter) of the lower shaft hole 113, thereby enabling the end of the gear shaft 500 to be snapped into the lower shaft hole 113 and enabling the positioning of the gear shaft 500. In addition, the lower communication groove 115 may preferably be a trapezoidal groove type, that is, the width of the notch of the lower communication groove 115 at the bottom edge of the side wall 110 is greater than the width of the position communicated with the lower shaft hole 113, thereby enabling easy operation during the snapping-in of the gear shaft 500 and providing a guide function. In other embodiments, the lower shaft hole 113 may be formed on the sidewall 110 by using a complete hole type, and the present embodiment is not limited thereto.

Further, as shown in fig. 1 and 14, based on the design that the main body 100 has the side wall 110 and the side wall 110 is provided with the shaft holes, in the present embodiment, both ends of the gear shaft 500 may be preferably provided with the retaining rings 530 respectively for limiting the gear shaft 500 between the two shaft holes in the second horizontal direction Y, so as to avoid the gear shaft 500 from moving in the second horizontal direction Y.

Further, as shown in fig. 1 and 14, based on the design of the retainer ring 530, in the present embodiment, the retainer ring 530 may preferably adopt a "C" shaped structure.

Further, as shown in fig. 1 and 12, based on the design of the retainer rings 530, in the present embodiment, the positions of the gear shaft 500 adjacent to both ends may preferably be provided with two annular grooves 540 for respectively mounting the two retainer rings 530 at both ends of the gear shaft 500. Accordingly, when the two ends of the gear shaft 500 are selectively disposed in the two shaft holes (the upper shaft hole 112 or the lower shaft hole 113), respectively, the inner ring of the retainer ring 530 is clamped in the annular groove 540, and the side surface of the retainer ring 530 abuts against the side wall 110, thereby limiting the gear shaft 500.

Preferably, as shown in fig. 1 to 4, in the present embodiment, the main body 100 has two end walls opposite in the first horizontal direction X, and for ease of understanding and explanation, the two end walls are defined as a first end wall 120 and a second end wall 130, respectively. The two end walls are respectively provided with adjusting holes, namely a first adjusting hole 121 formed on the first end wall 120 and a second adjusting hole 131 formed on the second end wall 130. Both ends of the screw rod 400 are rotatably disposed in the two adjusting holes, respectively, and the screw head 420 of the screw rod 400 may preferably be exposed outside the main body 100, so that the screw head 420 is exposed outside the first end wall 120 through the first adjusting hole 121.

Further, as shown in fig. 1 to 4, based on the design that the main body 100 has the first end wall 120 and the second end wall 130, in the present embodiment, the first end wall 120 (i.e., the end wall on which the screw head 420 is exposed) may preferably be opened with the locking hole 122 along the vertical direction Z. Wherein, one end of the locking hole 122 is located at the top or the bottom of the first end wall 120, and the other end of the locking hole 122 is communicated with the first adjusting hole 121 arranged on the first end wall 120. On this basis, the intervertebral cage may preferably further include a locking pin 123, and the locking pin 123 is removably disposed in the locking hole 122 to lock the screw 400 in the horizontal direction to prevent the screw 400 from shifting in the horizontal direction.

Further, as shown in fig. 1 to 4, based on the design that the main body 100 has the first end wall 120 and the second end wall 130, in the present embodiment, the first end wall 120 may preferably have a flat plate-shaped structure, and the second end wall 130 may preferably have an arc-surface-shaped structure.

Further, as shown in fig. 1, 2 and 4, based on the design that the main body 100 has the first end wall 120 and the second end wall 130, in the present embodiment, two instrument holding holes 124 may be preferably opened on both sides of the outer surface of the first end wall 120, and the two instrument holding holes 124 are respectively located on both sides of the first adjusting hole 121.

Preferably, as shown in fig. 1, 2 and 5, in the present embodiment, a surface (i.e., a lower surface) of the upper support plate 200 facing the main body 100 may preferably be provided with an upper slider 210. Accordingly, the main body 100 may preferably be provided with a slide groove 111, the slide groove 111 extending in the vertical direction Z. Accordingly, the upper slider 210 is slidably engaged with the sliding groove 111, so that the upper support plate 200 is slidably disposed up and down at the upper opening of the main body 100.

Further, as shown in fig. 1, 2 and 5, based on the design in which the upper support plate 200 is provided with the upper sliders 210 and the main body 100 is provided with the slide grooves 111, in the present embodiment, the support plate may be further preferably provided with two pairs of the upper sliders 210. Two pairs of upper sliders 210 are arranged along the first horizontal direction X at intervals, and two upper sliders 210 of the same pair are arranged along the second horizontal direction Y at intervals. Accordingly, the main body 100 may be further preferably provided with two pairs of sliding grooves 111. Two pairs of sliding grooves 111 are arranged at intervals along a first horizontal direction X, and two sliding grooves 111 of the same pair are arranged at intervals along a second horizontal direction Y. Accordingly, the two pairs of upper sliding blocks 210 correspond to the two pairs of sliding grooves 111, respectively, and the two upper sliding blocks 210 of the same pair correspond to the two sliding grooves 111 of the same pair, respectively, that is, the four sliding blocks are in one-to-one sliding fit with the four sliding grooves 111. In other embodiments, the number of the upper sliding blocks 210 may be one, two, three, or more than four, and the number of the sliding grooves 111 may be one, two, three, or more than four. When there are a plurality of upper sliding blocks 210, the plurality of upper sliding blocks 210 may be distributed in other manners, and when there are a plurality of sliding grooves 111, the plurality of sliding grooves may be distributed in other manners. The number of the upper sliding blocks 210 is not limited to be equal to the number of the sliding grooves 111, and the upper sliding blocks 210 are also not limited to correspond to the sliding grooves 111 one by one, for example, a design that more than two of the plurality of upper sliding blocks 210 are simultaneously slidably engaged with one sliding groove 111 may be adopted, which is not limited by the present embodiment.

Preferably, as shown in fig. 1, 2 and 8, in the present embodiment, a surface (i.e., an upper surface) of the lower support plate 300 facing the body 100 may preferably be provided with a lower slider 310. Accordingly, the main body 100 may preferably be provided with a slide groove 111, the slide groove 111 extending in the vertical direction Z. Accordingly, the lower slider 310 is slidably engaged with the slide groove 111, so that the lower support plate 300 is slidably disposed up and down at the lower opening of the main body 100.

Further, as shown in fig. 1, 2 and 8, based on the design in which the lower support plate 300 is provided with the lower slider 310 and the main body 100 is provided with the slide groove 111, in the present embodiment, the support plate may be further preferably provided with two pairs of the lower sliders 310. Two pairs of lower sliders 310 are arranged along the first horizontal direction X at intervals, and two lower sliders 310 of the same pair are arranged along the second horizontal direction Y at intervals. Accordingly, the main body 100 may be further preferably provided with two pairs of sliding grooves 111. Two pairs of sliding grooves 111 are arranged at intervals along a first horizontal direction X, and two sliding grooves 111 of the same pair are arranged at intervals along a second horizontal direction Y. Accordingly, the two pairs of lower sliding blocks 310 correspond to the two pairs of sliding grooves 111, respectively, and the two lower sliding blocks 310 of the same pair correspond to the two sliding grooves 111 of the same pair, respectively, that is, the four sliding blocks are in one-to-one sliding fit with the four sliding grooves 111. In other embodiments, the number of the lower sliders 310 may be one, two, three, or more than four, and the number of the sliding grooves 111 may be one, two, three, or more than four. When there are a plurality of lower sliding blocks 310, the plurality of lower sliding blocks 310 may be distributed in other manners, and when there are a plurality of sliding grooves 111, the plurality of sliding grooves may be distributed in other manners. The number of the lower sliding blocks 310 is not limited to be equal to the number of the sliding slots 111, and the lower sliding blocks 310 are not limited to correspond to the sliding slots 111 one by one, for example, a design that more than two of the lower sliding blocks 310 are simultaneously slidably engaged with one sliding slot 111 may be adopted, which is not limited by the present embodiment.

Further, as shown in fig. 1, 2, 5 and 8, based on the above-mentioned design of the upper slider 210, the lower slider 310 and the sliding groove 111, in the present embodiment, the number of the upper sliders 210 provided to the upper support plate 200 and the number of the lower sliders 310 provided to the lower support plate 300 are both four, that is, the number of the upper sliders 210 and the number of the lower sliders 310 may preferably be equal. Moreover, when the number of the upper sliders 210 and the lower sliders 310 is equal, the arrangement of the upper sliders 210 and the lower sliders 310 may be further preferably the same, that is, the upper sliders 210 correspond to the lower sliders 310 one by one, that is, each of the upper sliders 210 corresponds to one of the lower sliders 310 located therebelow in the vertical direction Z. On the basis, one upper sliding block 210 and one lower sliding block 310 corresponding to each pair of upper and lower sliding blocks may further preferably share one sliding groove 111, that is, each sliding groove 111 is in sliding fit with one upper sliding block 210 and one lower sliding block 310, and the upper sliding block 210 is located above the lower sliding block 310. Specifically, taking four upper sliders 210 and four lower sliders 310 as an example in the present embodiment, the main body 100 may be correspondingly provided with four sliding grooves 111, and the four sliding grooves 111 are divided into two pairs, the two pairs of sliding grooves 111 are arranged at intervals along the first horizontal direction X, and the two sliding grooves 111 of the same pair are arranged at intervals along the second horizontal direction Y. In other embodiments, when the upper slider 210 corresponds to the lower slider 310 one by one, the upper slider 210 and the lower slider 310 may be respectively slidably engaged with the independent sliding grooves 111, and the sliding groove 111 engaged with the upper slider 210 and the sliding groove 111 engaged with the corresponding lower slider 310 are disposed on the main body 100 at an interval in the vertical direction Z. Furthermore, when the upper slider 210 and the lower slider 310 do not adopt a one-to-one design, the sliding grooves 111 of the upper slider 210 and the lower slider 310 may be staggered in the horizontal direction, which is not limited to this embodiment.

Further, as shown in fig. 1 to 4, based on the design in which the main body 100 is provided with the slide groove 111, in the present embodiment, the main body 100 has two side walls 110 parallel in the second horizontal direction Y. On this basis, the slide groove 111 may preferably be provided on at least one of the two side walls 110.

Further, as shown in fig. 1 to 4, based on the design in which the slide grooves 111 are provided on the side walls 110, and based on the design in which the main body 100 is provided with two pairs of slide grooves 111, in the present embodiment, two slide grooves 111 of the same pair may be provided on two side walls 110, respectively, that is, one slide groove 111 belonging to each of the two pairs is arranged at intervals in the first horizontal direction X on one side wall 110, and the other slide groove 111 belonging to each of the two pairs is arranged at intervals in the first horizontal direction X on the other side wall 110.

Preferably, as shown in fig. 1, 5 to 7, in the present embodiment, a surface (i.e., a lower surface) of the upper support plate 200 facing the main body 100 may preferably be provided with an upper boss 220 protruding toward the main body 100. Specifically, the upper boss 220 has a substantially annular structure and surrounds the inner circumference of the lower surface of the upper support plate 200. On this basis, the outer circumferential shape of the upper support plate 200 may preferably match the outer circumferential shape of the body 100, and the outer circumferential shape of the upper boss 220 may preferably match the shape of the upper opening (including the lower opening). Accordingly, when the upper support plate 200 is not supported and disposed at the upper opening, the outer circumference of the upper boss 220 is attached to the inner wall of the main body 100 (i.e., the wall of the inner cavity), so that the upper support plate 200 closes the upper opening by the upper boss 220, and the outer circumference of the upper support plate 200 and the outer circumference of the main body 100 substantially form an integral structure. In other embodiments, the upper boss 220 may have a plate-like structure, a block-like structure, or an intermittent ring-like structure, but is not limited to this embodiment.

Further, as shown in fig. 1, 5 and 7, based on the design of the upper boss 220 and simultaneously based on the design of the upper support plate 200 provided with the upper slider 210, in the present embodiment, the upper slider 210 may be preferably provided at the outer circumference of the upper boss 220. Accordingly, when the upper support plate 200 is not spread and is closed at the upper opening, the outer circumference of the upper boss 220 is attached to the inner wall of the main body 100, and the upper slider 210 protruding from the outer circumference of the upper boss 220 is accommodated in the sliding slot 111 formed in the main body 100. When the expansion assembly expands the upper support plate 200 upward relative to the main body 100, the upper slider 210 slides in the sliding groove 111. In addition, the sliding groove 111 is a structure in which the upper and lower ends are closed in this embodiment, so that the upper slider 210 can be prevented from coming off the sliding groove 111, and the upper support plate 200 can be limited from moving upward.

Further, as shown in fig. 1, 5 and 7, based on the design of the upper boss 220, in the present embodiment, when the upper boss 220 has a certain thickness in the vertical direction Z, the upper boss 220 may also be preferably provided with an escape groove 221 for avoiding structural interference with the screw 400 and the gear shaft 500 in a state where the upper support plate 200 is not expanded and just begins to be expanded. In other embodiments, based on the design of the upper boss 220, when the thickness of the upper boss 220 in the vertical direction Z is relatively thin, the avoiding groove 221 may not be provided. That is, when the upper support plate 200 is not supported but disposed at the upper opening, if the thickness of the upper boss 220 is not enough to interfere with the screw 400 and the gear shaft 500, the avoiding groove 221 does not need to be disposed, and the present embodiment is not limited thereto.

Preferably, as shown in fig. 1, 5 to 7, in the present embodiment, a surface (i.e., an upper surface) of the lower support plate 300 facing the main body 100 may preferably be convexly provided with a lower boss 320 facing the main body 100. Specifically, the lower boss 320 has a substantially annular structure and surrounds the inner circumference of the upper surface of the lower support plate 300. On this basis, the outer circumferential shape of the lower support plate 300 may preferably match the outer circumferential shape of the body 100, and the outer circumferential shape of the lower boss 320 may preferably match the shape of the lower opening (including the upper opening). Accordingly, when the lower support plate 300 is not spread and disposed at the lower opening, the outer circumference of the lower boss 320 is attached to the inner wall of the main body 100 (i.e., the cavity wall of the inner cavity), so that the lower opening of the lower support plate 300 is closed by the lower boss 320, and the outer circumference of the lower support plate 300 and the outer circumference of the main body 100 substantially form an integral structure. In other embodiments, the lower boss 320 may also be a plate-shaped structure, a block-shaped structure, or an intermittent ring-shaped structure, and the like, which is not limited to the embodiment.

Further, as shown in fig. 1, 5 and 7, based on the design of the lower boss 320, and simultaneously based on the design in which the lower support plate 300 is provided with the lower slider 310, in the present embodiment, the lower slider 310 may be preferably provided at the outer circumference of the lower boss 320. Accordingly, when the lower support plate 300 is not spread and is closed in the lower opening, the outer circumference of the lower boss 320 is attached to the inner wall of the main body 100, and the lower slider 310 protruding from the outer circumference of the lower boss 320 is accommodated in the sliding slot 111 formed in the main body 100. When the distracting assembly distracts the lower support plate 300 downward relative to the main body 100, the lower slider 310 slides within the sliding slot 111. In addition, the chute 111 is a structure in which the upper and lower ends are closed in this embodiment, so that the lower slider 310 can be prevented from coming off the chute 111, and the lower support plate 300 can be limited from moving downward.

Further, as shown in fig. 1, 5 and 7, based on the design of the lower boss 320, in the present embodiment, when the lower boss 320 has a certain thickness in the vertical direction Z, the lower boss 320 may also be preferably provided with an avoiding groove 221 for avoiding structural interference with the screw 400 and the gear shaft 500 in a state where the lower support plate 300 is not expanded and just begins to be expanded. In other embodiments, based on the design of the lower boss 320, when the thickness of the lower boss 320 in the vertical direction Z is relatively thin, the avoiding groove 221 may not be provided. That is, when the lower support plate 300 is not spread and disposed at the lower opening, the thickness of the lower boss 320 is not sufficient to interfere with the screw 400 and the gear shaft 500, and the avoidance groove 221 does not need to be disposed, and the present embodiment is not limited thereto.

Preferably, as shown in fig. 5 and 6, in the present embodiment, a surface (i.e., an upper surface) of the upper support plate 200 facing away from the body 100 may preferably be provided with a slip prevention structure 240 to increase a surface area of the upper surface of the upper support plate 200, thereby optimizing the coupling effect of the upper support plate 200 to the vertebrae.

Preferably, as shown in fig. 8 and 9, in the present embodiment, a surface (i.e., a lower surface) of the lower support plate 300 facing away from the body 100 may preferably be provided with a slip prevention structure 240 to increase a surface area of the lower surface of the lower support plate 300, thereby optimizing the coupling effect of the lower support plate 300 to the vertebrae.

Further, as shown in fig. 5, 6, 8 and 9, based on the design of the anti-slip structure 240 of the upper and lower support plates 200 and 300, the shape of the anti-slip structure 240 may preferably be a wave-shaped texture in the present embodiment. In other embodiments, the shape of the anti-slip structure 240 may also adopt a zigzag texture (for example, trapezoidal sawtooth, rectangular sawtooth, etc.), an irregular texture, etc., and is not limited to the present embodiment. In addition, when the anti-slip structure 240 is provided to both the upper support plate 200 and the lower support plate 300, the anti-slip structures 240 provided to the upper support plate 200 and the lower support plate 300 are not limited to be the same.

Preferably, as shown in fig. 7, in the present embodiment, the upper support plate 200 may preferably be provided with an upper through hole 230, and the upper through hole 230 penetrates through the upper surface and the lower surface of the upper support plate 200.

Preferably, as shown in fig. 10, in the present embodiment, the lower support plate 300 may preferably be provided with a lower through hole 330, and the lower through hole 330 penetrates through the upper surface and the lower surface of the lower support plate 300.

Preferably, as shown in fig. 1 and 11, in the present embodiment, a rod body of the screw 400 is provided with a one-way thread 410, one end of the screw 400 is provided with a screw head 420, and an end surface of the screw head 420 may be preferably provided with an inner hexagonal structure 421. Accordingly, when the two support plates need to be expanded, an external hexagonal wrench or other tool can be used to fit the internal hexagonal structure 421 of the screw head 420, so as to achieve the rotation adjustment of the screw rod 400. In other embodiments, the end surface of the screw head 420 may also be provided with other structures for facilitating screwing, such as an outer hexagonal structure, an inner triangular structure, and the like, which is not limited to the embodiment.

Preferably, as shown in fig. 1, in the present embodiment, each set of gear shafts may preferably include two gear shafts 500, and the two gear shafts 500 of the same set are spaced apart along the first horizontal direction X. In other embodiments, the number of the gear shafts 500 included in each gear shaft may be one, three or four or more, and when one gear shaft includes a plurality of gear shafts 500, the gear shafts 500 in the same group are spaced apart along the first horizontal direction X. In addition, the number of the gear shafts 500 included in each of the upper and lower gear shafts may be preferably the same, or may be different.

Further, as shown in fig. 1, in the present embodiment, based on the design in which each set of gear shafts includes two gear shafts 500, in the present embodiment, the gear shafts 500 included in each of the upper and lower sets of gear shafts may be preferably arranged in a one-to-one correspondence. That is, any one of the gear shafts 500 located above the screw 400 is arranged to be vertically opposed to one of the gear shafts 500 located below the screw 400 in the vertical direction Z. In other embodiments, the two gear shafts may be arranged in a staggered manner regardless of whether the number of the two gear shafts is the same, and the present embodiment is not limited thereto.

Preferably, as shown in fig. 1, 12 and 13, in the present embodiment, two pushing arms 520 may be preferably provided on each gear shaft 500. Wherein the two pushing arms 520 may preferably be respectively located at both sides of the gear 510 in the first horizontal direction X. Accordingly, by providing a plurality of pushing arms 520 on each gear shaft 500, the stability of the extension of the support plate can be further optimized, and the operator can be more labor-saving. In other embodiments, only one pushing arm 520 may be provided on each gear shaft 500, or more than two pushing arms 520 may be provided, and when a plurality of pushing arms 520 are provided on the gear shaft 500, it may be preferable to provide a part of these pushing arms 520 on one side of the gear 510 in the second horizontal direction Y and to provide the remaining pushing arms 520 on the other side of the gear 510. In addition, the number of the pushing arms 520 provided on each gear shaft 500 is not limited to the same, and the arrangement form is not limited to the same, and is not limited to the present embodiment.

As shown in fig. 1 to 10, in the present embodiment, the upper support plate 200 and the lower support plate 300 have substantially the same structure, and it can be understood that the upper support plate 200 and the lower support plate 300 are arranged in an image of a reference plane, and the reference plane is a middle horizontal plane of the body 100. Further, based on the design that the upper support plate 200 and the lower support plate 300 have substantially the same structure, the main body 100 may also have a mirror-image structure, and the upper and lower portions of the main body 100, which are mirror images of each other, are also relative to the reference plane. In other embodiments, several of the upper support plate 200 and the lower support plate 300 may be different, for example, the two may have different shapes, thicknesses, sizes, etc., and the structure of the main body 100 may be adjusted according to the structural differences between the upper support plate 200 and the lower support plate 300, which is not limited to this embodiment.

It should be noted herein that the interbody cages illustrated in the figures and described in the present specification are but a few examples of the wide variety of interbody cages that can employ the principles of the present invention. It should be clearly understood that the principles of the present invention are in no way limited to any of the details of the intersomatic cage or any of the components of the intersomatic cage shown in the drawings or described in the present specification.

In summary, the intervertebral cage of the present invention comprises a main body, two support plates and a distraction assembly. The strutting component comprises a screw and two gear shafts. The two groups of gear shafts are respectively positioned above and below the screw rod, the gear shafts are provided with gears and pushing arms which are distributed at intervals, and the gears are meshed with the screw rod. In view of the above, can drive two sets of gear shafts synchronous revolution through the adjusting screw rotation, the top arm that pushes away of two sets of gear shafts pushes away the relative main part of two backup pads respectively and removes in vertical direction. Through the design, the interbody fusion cage provided by the invention has the advantages of simple structure and simplicity and convenience in operation while synchronously expanding the upper supporting plate and the lower supporting plate. In addition, the matching design of the screw and the gear shaft is adopted to realize the distraction function, and the meshing characteristic of the screw and the gear also ensures that the invention has the self-locking function.

Exemplary embodiments of the intervertebral cage according to the present disclosure are described and/or illustrated in detail above. Embodiments of the invention are not limited to the specific embodiments described herein, but rather, components and/or steps of each embodiment may be utilized independently and separately from other components and/or steps described herein. Each component and/or step of one embodiment can also be used in combination with other components and/or steps of other embodiments. When introducing elements/components/etc. described and/or illustrated herein, the articles "a," "an," and "the" are intended to mean that there are one or more of the elements/components/etc. The terms "comprising," "including," and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc. Furthermore, the terms "first" and "second" and the like in the claims and the description are used merely as labels, and are not numerical limitations of their objects.

While the present invention has been described in terms of various specific embodiments, those skilled in the art will recognize that the invention can be practiced with modification within the spirit and scope of the claims.