WO2019114345A1

WO2019114345A1 - Height-adjustable vertebral fusion cage

Info

Publication number: WO2019114345A1
Application number: PCT/CN2018/104946
Authority: WO
Inventors: 赵汝琛
Original assignee: 广州爱锘德医疗器械有限公司
Priority date: 2017-12-12
Filing date: 2018-09-11
Publication date: 2019-06-20
Also published as: CN108113781B; CN108113781A

Abstract

A height-adjustable vertebral fusion cage, comprising: an inner tube (10), and an outer tube (20) provided as a sleeve on the inner tube (10). The outer tube (20) is connected to the inner tube (10) via a top end. A first notch (210) is provided on the outer tube (20). An outer tube wall between two adjacent first notches (210) forms an expanding portion (220). An end of the first notch (210) is provided with a first position-limiting plate (230) extending along an axial direction of the outer tube (20). A second notch (110) is provided on the inner tube (10). An inner tube wall between two adjacent second notches (110) forms a first supporting portion (120). The position of the first supporting portion (120) corresponds to the position of the first notch (210). In a first compression state, the expanding portion (220) of the outer tube (20) transforms and expands outward and the first position-limiting plates (230) connect to each other. In a second compression state, the first supporting portion (120) of the inner tube (10) transforms and expands outward to release the first position-limiting plate (230), such that the expanding portion (220) of the outer tube (20) can further transform and expand outward. The height-adjustable vertebral fusion cage has a small pre-transformation volume, causing less injury to patients, and utilizes the first compression state and the second compression state such that the needs of different patients with various vertebral heights can be met.

Description

Height-adjustable vertebral body cage

Technical field

The invention relates to the field of medical instruments, in particular to a height adjustable vertebral body cage.

Background technique

In daily life, cases of vertebral body damage due to tumors, fractures, infections, or degenerative diseases occur in the treatment of these patients by implanting a cage between the damaged vertebral bodies. The bone tissue produces a creep substitute to repair the damaged vertebral body. However, the traditional vertebral body cage is highly fixed, and the intervertebral height of the human body varies from person to person. It is not possible to adjust the height of the vertebral body cage to suit different patients during surgery. The intervertebral height affects the versatility and applicability of the treatment; while the vertebral body cage with high height adjustment function is large in volume and complicated in structure, the wound to be cut when implanting is large, and the damage to the patient is relatively high. Big.

Summary of the invention

Based on this, the present invention overcomes the deficiencies of the prior art and provides a height-adjustable vertebral body cage that not only achieves height adjustment but also has less damage to the patient.

A height-adjustable vertebral body cage includes an inner tube and an outer tube sleeved outside the inner tube, the outer tube is connected to a top end of the inner tube, and the outer tube is provided with a first gap, adjacent The outer tube wall between the two first notches forms a struts, the end of the first notch is provided with a first limiting piece extending in the axial direction of the outer tube, and the inner tube is provided with a second notch The inner tube wall between the adjacent two second notches forms a first supporting portion, and the first supporting portion corresponds to the position of the first notch, and both the inner tube and the outer tube can be squeezed and expanded. In the first pressing state, the erecting portion of the outer tube is deformed outwardly, and the first limiting piece abuts. In the second pressing state, the first supporting portion of the inner tube is outwardly deformed and convex. And the first limiting piece is opened and the supporting portion of the outer tube can continue to deform outwardly.

In use, the undeformed height-adjustable vertebral body cage is implanted between the vertebral bodies by a deformation tool, and then the bottom end of the outer tube is pressed by the deformation tool, so that the struts of the outer tube are deformed outwardly. After the deformation to a certain extent, the first limiting piece abuts the limiting struts and continues to be squeezed and deformed. At this time, the vertebral body cage is in the first pressing state, and the struts of the outwardly deforming protrusion can support the vertebral body. Body end plate; if the height of the vertebral body cage in the first squeeze state cannot meet the height requirement of the patient's intervertebral height, the bottom end of the inner tube may be first pressed to deform the first support portion of the inner tube outwardly. At the same time, the deformed first support portion is outwardly opened to the first limit piece corresponding to the position thereof, so that the squeeze gap is released, and then the bottom end of the outer tube is pressed, so that the support portion of the outer tube continues to The outer deformation is raised until the struts are stretched until the supporting force with the vertebral endplate is appropriate. The height-adjustable vertebral body cage has a simple structure and a small volume before deformation, so the patient needs a small incision wound, which has less damage to the patient, and has a first squeeze state and a second squeeze state. The deformation height is adjusted according to the requirements to meet the requirements of the intervertebral height of different patients, and the versatility and applicability are good.

Further, the side portion of the erecting portion is provided with an extending portion, and the two sides of the extending portion are provided with a notch, and in the first pressing state and the second pressing state, the erecting portion is along the concave portion The mouth is deformed outwards.

Further, the outer tube is provided with a plurality of the first notches spaced apart in the axial direction, and the plurality of first notches are distributed in two rows arranged opposite each other, and the outer tube wall between the first notches of the adjacent columns forms two Arranging the erecting portions, wherein the inner tube is spaced apart from each other in the axial direction by a plurality of the second notches, and the plurality of second notches are distributed in two rows opposite to each other, and between the second notches of the adjacent columns The inner tube wall forms two rows of the first support portion.

Further, the outer tube is provided with four rows of third notches in the axial direction, and the outer tube wall between the third notches of the adjacent columns forms four rows of anti-rotation portions, and the ends of the third notches are provided along the edge a second limiting piece extending in the axial direction of the outer tube, wherein the inner tube is provided with four rows of fourth notches in the axial direction, and the inner tube wall between the fourth notches of the adjacent columns forms four rows of second supporting portions The second supporting portion corresponds to the position of the third notch. In the first pressing state, the anti-rotation portion of the outer tube is outwardly deformed and convex, and the second limiting piece abuts, the second extrusion In the pressed state, the second support portion of the inner tube is deformed outwardly and protrudes from the second limiting piece, and the anti-rotation portion of the outer tube can continue to deform outwardly.

Further, one of the columns is located between the two rows of the anti-rotation portions, and the other column of the protrusions is located between the other two rows of anti-rotation portions, and in the first pressing state and the second pressing state, The highest point of the struts is flush with the highest point of the anti-rotation portion.

Further, the anti-rotation portion is disposed at both ends of the outer tube; or in the axial direction, the anti-rotation portion and the propping portion are alternately disposed.

Further, a central portion of the anti-rotation portion, a middle portion of the first support portion, and a middle portion of the second support portion are provided with an extrusion port for squeezing the anti-rotation portion, the first support portion and the second support portion Deformed outward after pressing.

Further, both ends of the first notch are provided with a first limiting piece, and a pressing interval is left between the two first limiting pieces, wherein the length of the first limiting piece closer to the top end of the outer tube is greater than another a length of a first limiting piece, a second limiting piece is disposed at both ends of the third notch, and a pressing interval is left between the two second limiting pieces, wherein a second limit is closer to the top end of the outer tube The length of the bit slice is greater than the length of the other second limit slice.

Further, the height-adjustable vertebral body cage further includes an inner core, the inner core is disposed in the inner tube, and the top ends of the outer tube and the inner tube are connected to a top end of the inner core, The bottom end of the inner core is provided with a thread that matches the deformation tool.

Further, the length of the outer tube is greater than the length of the inner tube, the length of the inner tube is greater than the length of the inner core, and the length of the outer tube and the length of the inner tube in the first extruded state Equally, in the second extruded state, the outer tube and the inner tube have a length equal to or slightly longer than the inner core.

DRAWINGS

1 is a schematic structural view of a height-adjustable vertebral body cage according to an embodiment of the present invention;

2 is a schematic structural view of an outer tube in the height-adjustable vertebral body cage shown in FIG. 1;

3 is a schematic structural view of an inner tube in the height-adjustable vertebral body cage shown in FIG. 1;

Figure 4 is a schematic view showing the structure of the inner core in the height-adjustable vertebral body cage shown in Figure 1;

5 is a schematic structural view of a height-adjustable vertebral body cage in a first squeeze state according to an embodiment of the present invention;

Figure 6 is a schematic view showing the structure of the outer tube in the height-adjustable vertebral body cage shown in Figure 5;

7 is a schematic structural view of a height adjustable vertebral body cage in a second extruded state according to an embodiment of the present invention;

Figure 8 is a schematic view showing the structure of the outer tube in the height-adjustable vertebral body cage shown in Figure 7;

Figure 9 is a schematic view showing the structure of the inner tube in the height-adjustable vertebral body cage shown in Figure 7.

Description of the reference signs:

10, inner tube, 101, extrusion port, 110, second gap, 120, first support portion, 130, fourth gap, 140, second support portion, 150, third limit piece, 160, fourth limit Position piece, 20, outer tube, 201, extrusion port, 210, first notch, 220, struts, 230, first limiting piece, 240, extension, 250, notch, 260, third notch, 270, anti-rotation part, 280, second limit piece, 30, inner core, 310, even pull.

Detailed ways

In order to facilitate the understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. Preferred embodiments of the invention are given in the drawings. However, the invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be more fully understood.

It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or the element can be present. When an element is considered to be "connected" to another element, it can be directly connected to the other element or. In contrast, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right", and the like, as used herein, are for the purpose of illustration and are not intended to be the only embodiment.

All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. The terminology used in the description of the present invention is for the purpose of describing particular embodiments and is not intended to limit the invention. The term "and/or" used herein includes any and all combinations of one or more of the associated listed items.

As shown in FIGS. 1-4, a height-adjustable vertebral body cage includes an inner tube 10 and an outer tube 20 sleeved outside the inner tube 10, the outer tube 20 being connected to the top end of the inner tube 10, The outer tube 20 is provided with a first notch 210, and the outer tube wall between the two adjacent first notches 210 forms a struts 220. The end of the first notch 210 is provided along the axial direction of the outer tube 20. a first limiting piece 230 extending in a direction, a second notch 110 is defined in the inner tube 10, and an inner tube wall between two adjacent second notches 110 forms a first supporting portion 120, the first supporting portion 120 corresponds to the position of the first notch 210, and both the inner tube 10 and the outer tube 20 can be squeezed and expanded. In the first pressing state, the rising portion 220 of the outer tube 20 is outwardly deformed and convex. And the first limiting piece 230 abuts, in the second pressing state, the first supporting portion 120 of the inner tube 10 is outwardly deformed and protrudes and the first limiting piece 230 is opened, so that the outer portion The struts 220 of the tube 20 can continue to deform outwardly.

In use, the undeformed height-adjustable vertebral body cage is implanted between the vertebral bodies by a deformation tool, and then the bottom end of the outer tube 20 is pressed by the deformation tool, so that the struts 220 of the outer tube 20 are oriented. After the outer deformation protrusion is deformed to a certain extent, the first limiting piece 230 abuts the restriction supporting portion 220 to continue to be squeezed and deformed, and the vertebral body cage is in the first pressing state, and the outwardly deforming convex support The upper portion 220 can support the vertebral body endplate; if the height of the vertebral body cage in the first extruded state cannot meet the intervertebral height requirement of the patient, the bottom end of the inner tube 10 can be first squeezed to make the inner tube 10 A support portion 120 is outwardly deformed and convex, and the deformed first support portion 120 is outwardly opened to the first limiting piece 230 corresponding to the position thereof, so that the pressing gap is released, and then the bottom end of the outer tube 20 is performed. Extrusion causes the struts 220 of the outer tube 20 to continue to deform outwardly until the struts 220 are expanded until the supporting force with the vertebral endplates is appropriate. The height-adjustable vertebral body cage has a simple structure and a small volume before deformation, so the patient needs a small incision wound, which has less damage to the patient, and has a first squeeze state and a second squeeze state. According to the demand, the deformation height is adjusted to meet the requirements of the intervertebral height of different patients, and according to the control of the degree of extrusion, the adjustment of the opening height of the outer tube 20 can be flexibly realized, and the versatility and applicability are better; The vertebral body cage has a larger internal bone grafting space and a higher healing success rate. The first limiting piece 230 is formed by cutting the outer wall of the outer tube 20 in the first notch 210.

Further, as shown in FIG. 1 and FIG. 2, the side portion of the extending portion 220 is provided with an extending portion 240, and the two sides of the extending portion 240 are provided with a notch 250, a first pressing state and a second pressing. In the state, the struts 220 are outwardly deformed and convex along the notches 250. By providing the extending portion 240 at the side of the erecting portion 220 and opening the notch 250 on both sides of the extending portion 240, when the outer tube 20 is pressed, the strength of the notch 250 is smaller than other places. The erecting portion 220 can be expanded and deformed outward along the notch 250 to form a protrusion, as shown in FIGS. 5 and 7, and the struts 220 between the two notches 250 are the highest points after deformation, and are formed to support the vertebral body. The support surface of the endplate increases the contact area with the vertebral endplate, improves the stability of the support, ensures the adjustment and strength of the support height, and avoids the highest point of the support to pierce the vertebral endplate, causing the body of the patient In addition, an extension portion 240 is provided between the two recesses 250 on the side of the erecting portion 220 to further increase the contact surface and increase the contact area with the vertebral body endplate.

The extension 240 is formed by cutting the outer wall of the outer tube 20 in the first notch 210. As shown in FIG. 1 , the first limiting piece 210 is provided with a first limiting piece 230 at both ends thereof, and a pressing interval is left between the two first limiting pieces 230 , and the first pressing state is due to the outer wall. Compressed and deformed, the two first limiting pieces 230 are gradually brought together until they abut each other. At this time, the outer tube 20 can no longer be deformed by extrusion. When the inner tube 10 is pressed and deformed, the first supporting portion 120 protrudes. The first limiting piece 230 is outwardly opened to allow the pressing gap to be released, so that the outer tube 20 can be deformed again. Further, in the two first limiting pieces 230 at both ends of the first notch 210, the length of the first limiting piece 230 closer to the top end of the outer tube 20 is greater than the length of the other first limiting piece 230 due to the outer tube 20 and the inner tube 10 is extruded from the bottom end to the top end, and the length of the first limiting piece 230 closer to the top end of the outer tube 20 is set to be longer than the length of the other first limiting piece 230, so as to be squeezed and compressed toward the top end. The first supporting portion 120 of the deformed inner tube 10 can better open the first limiting piece 230 with a longer length, thereby breaking the limitation of the deformation of the first limiting piece 230 to the outer tube 20, so that the outer tube 20 can Continued to squeeze deformation. Of course, the length of the first limiting piece 230 closer to the top end of the outer tube 20 may be less than or equal to the other first. As shown in FIG. 1 , the limiting piece 230 can be used to open the first limiting piece 230 as long as the first supporting part 120 is deformed. Alternatively, the first limiting piece 230 may be disposed only at one end of the first notch 210, and the first limiting piece 230 abuts the other end of the first notch 210 in the first pressing state.

Further, as shown in FIG. 1 and FIG. 2, a plurality of the first notches 210 are disposed on the outer tube in the axial direction, and the plurality of first notches 210 are distributed in two opposite rows, adjacent to each other. The outer tube wall between the first notches 210 of the column forms two rows of the struts 220, and the inner tube 10 is provided with a plurality of the second notches 110 spaced apart in the axial direction, and the plurality of second notches 110 The two rows are disposed opposite each other, and the inner tube wall between the second notches 110 of the adjacent columns forms two rows of the first support portions 120. As shown in FIGS. 5 and 7, two rows of struts 220 are deformed to form two rows of protrusions disposed opposite each other, and the protrusions in each column are spaced apart for respectively for the upper and lower plates of the vertebral endplate. support.

Further, as shown in FIG. 1 and FIG. 2, the outer tube is provided with four rows of third notches 260 in the axial direction, and the outer tube walls between the adjacent third indentations 260 form four rows of anti-rotation portions 270. The end of the third notch 260 is provided with a second limiting piece 280 extending in the axial direction of the outer tube 20, and the inner tube 10 is provided with four rows of fourth notches 130 in the axial direction, adjacent columns The inner tube wall between the fourth notches 130 forms four rows of second supporting portions 140, and the second supporting portions 140 correspond to the positions of the third notches 260. In the first pressing state, the outer tube 20 The anti-rotation portion 270 is outwardly deformed and protruded, and the second limiting piece 280 abuts. In the second pressing state, the second supporting portion 140 of the inner tube 10 is outwardly deformed and protrudes and the second portion is opened. The limiting piece 280, the anti-rotation portion 270 of the outer tube 20 can continue to deform outwardly. When the outer tube 20 is pressed and deformed, the four rows of anti-rotation portions 270 are expanded and deformed outward, and from the one end of the outer tube 20 to the other end, the four rows of anti-rotation portions 270 form a cross shape, which can support the vertebra on the one hand. The action of the endplate, on the other hand, avoids rotation of the outer tube 20, so that the two struts 220 of the outer tube 20 can securely erect the vertebral endplate.

As shown in FIG. 4-8, the deformation principle of the anti-rotation portion 270 is similar to that of the propping portion 220. In the first pressing state, the anti-rotation portion 270 is deformed to a certain extent and can not be deformed after being restricted by the second limiting piece 280. When the inner tube 10 is deformed and the second supporting portion 140 is extended to the second limiting piece 280, the anti-rotation portion 270 can continue to be deformed by extrusion; the second limiting piece 280 is similar in structure and arrangement to the first limiting piece 230. a second limiting piece 280 is disposed at both ends of the third notch 260, and a pressing interval is left between the two second limiting pieces 280, wherein the second limiting piece 280 is closer to the top end of the outer tube 20. The second support portion 140 of the inner tube 10, which is more than the length of the other second limit piece 280, is easily squeezed and deformed toward the top end to better open the second limit piece 280 having a longer length, that is, The restriction of the deformation of the outer tube 20 by the second limiting piece 280 can be broken, so that the outer tube 20 can be continuously deformed by extrusion. Of course, the second limiting piece 280 is disposed at both ends of the third notch 260 according to actual use requirements, and the second limiting piece 280 closer to the top end of the outer tube 20 may also be less than or equal to another length. As shown in FIG. 1 and FIG. 2, the second limiting piece 280 can be used to open the second limiting piece 280 as long as the second supporting part 140 is deformed. Alternatively, the second limiting piece 280 may be disposed only at one end of the third notch 260. The second limiting piece 280 abuts the other end of the third notch 260 in the first pressing state.

The third limiting piece 150 can also be disposed at both ends of the second notch 110, and the pressing pitch between the two third limiting pieces 150 is set according to the highest protrusion height requirement of the first supporting part 120. The fourth limiting piece 160 may also be disposed at both ends of the fourth notch 130. The pressing distance between the two fourth limiting pieces 160 is set according to the highest protrusion height requirement of the second supporting part 140.

Further, as shown in FIGS. 4 and 7, one row of the struts 220 is located between the two rows of the anti-rotation portions 270, and the other column of the erecting portions 220 is located between the other two rows of the anti-rotation portions 270, and In a pressed state and a second pressed state, the highest point of the urging portion 220 is flush with the highest point of the anti-rotation portion 270. The deformed two rows of anti-rotation portions 270 are supported on the lower plate of the vertebral endplate, and the other two rows of anti-rotation portions 270 are supported on the upper plate of the vertebral endplate. Optionally, the four rows of anti-rotation portions 270 are evenly arranged around the circumferential direction of the outer tube 20, and the adjacent anti-rotation portions 270 are at an angle of 90° between the deformations; according to actual needs, the four rows of anti-rotation portions 270 may also be used. Two of the columns are oppositely arranged, and the other two columns are oppositely arranged to form upper and lower corresponding supports.

In one embodiment, as shown in FIGS. 1, 5, and 6, the anti-rotation portion 270 is disposed at both ends of the outer tube 20, that is, an anti-rotation portion 270 is disposed at a position near the top end and the bottom end of the outer tube 20 to form an anti-rotation portion 270. Two cross-shaped structures serve to prevent rotation of the vertebral body cage. In another implementation, in the axial direction, the anti-rotation portion 270 and the propping portion 220 are alternately disposed, that is, after a cross-shaped structure formed by four anti-rotation portions 270 is provided, and then one of the two supports is provided. The portion 220 is formed in a line structure, then the cross structure is set, the word structure is set, and so on. The number and arrangement order of the cross structure and the word structure can be set as needed.

Further, as shown in FIG. 1 and FIG. 2 and FIG. 3, the middle portion of the anti-rotation portion 270 is provided with a pressing opening 201, a central portion of the first supporting portion 120, and a central portion of the second supporting portion 220 are respectively provided with a pressing opening 101. The anti-rotation portion 270, the first support portion 120, and the second support portion 220 are pressed and deformed outward. The pressing opening 101 is formed by cutting the central recess on both sides of the first supporting portion 120 or the second supporting portion 220, and the strength at the pressing opening 101 on the first supporting portion 120 is smaller than that of the first supporting portion 120. The strength of the pressing port 101 on the second supporting portion 140 is less than the strength of the other portion of the second supporting portion 140, and is facilitated to deform outwardly along the pressing opening 101 during the pressing process; 201 is formed by cutting the central recess on both sides of the anti-rotation portion 270, and the strength at the pressing opening 201 is smaller than the strength of the other portion of the anti-rotation portion 270, and the protrusion is easily deformed outward along the pressing opening 201 during the pressing process.

Further, as shown in FIGS. 1, 3 and 6, the height-adjustable vertebral body cage further includes an inner core 30, the inner core 30 is disposed in the inner tube 10, and the outer tube 20 and the inner tube The top end of the tube 10 is connected to the top end of the inner core 30, and the bottom end of the inner core 30 is provided with a thread matching the deformation tool. The top end of the inner core 30 is provided with a connecting rod 310. The bottom end of the inner core 30 is provided with a threaded hole (not shown), and the top ends of the inner tube 10 and the outer tube 20 are welded to the connecting body. On the wrench 310, the three form a fixed connection, and the threaded hole is threadedly engaged with the deformation tool. When deformed, the core of the deformation tool pulls the top ends of the inner core 30, the inner tube 10 and the outer tube 20, and then the deformation The tool can squeeze the bottom end of the outer tube 20 and the inner tube 10, so that the outer tube 20 and the inner tube 10 are oppositely biased, thereby expanding and deforming. The expansion process starts from the top end of the outer tube 20 or the inner tube 10, and gradually Deformation occurred. The inner core 30 is disposed on the one hand to facilitate the connection of the inner tube 10 and the outer tube 20, and at the same time to facilitate the connection with the deformation tool, on the other hand, to improve the strength of the entire vertebral body cage, and to make the inner portion of the inner tube 10 Fill it to avoid its inward deformation. According to the actual demand, the thread can be directly matched with the deformation tool on the inner wall of the inner tube 10 to meet the extrusion demand.

In one embodiment, the length of the outer tube 20 is greater than the length of the inner tube 10, the length of the inner tube 10 is greater than the length of the inner core 30, and the outer tube is in a first squeeze state. The length of the inner tube 10 is equal to the length of the inner tube 10, and the length of the outer tube 20 and the inner tube 10 is equal to or slightly longer than the inner core 30 in the second extruded state. Thus, in use, the vertebral body cage structure in the first squeeze state and the second squeeze state is more compact, more convenient to use, and at the same time facilitates the deformation of the deformation tool and the bottom end of the outer tube 20.

Further, the height adjustable vertebral body fusion device is made of SUS304, PEEK, titanium alloy or trabecular metal, which conforms to the standard of the implanted medical device, and the surface treatment method can be polishing, sanding, plasma spraying, spraying nanometer. Coating and other methods. In the embodiment, the inner tube 10, the outer tube 20 and the inner core 30 are cylindrical bodies, and may be a rectangular parallelepiped or a rectangular parallelepiped according to requirements.

The technical features of the above-described embodiments may be arbitrarily combined. For the sake of brevity of description, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be considered as the scope of this manual.

The above-described embodiments are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but is not to be construed as limiting the scope of the invention. It should be noted that a number of variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of the invention should be determined by the appended claims.

Claims

A height-adjustable vertebral body fusion device, comprising: an inner tube and an outer tube sleeved outside the inner tube, the outer tube is connected to a top end of the inner tube, and the outer tube is firstly opened a notch, an outer tube wall between two adjacent first notches forms a struts, and an end of the first notch is provided with a first limiting piece extending in an axial direction of the outer tube, the inner tube is opened a second notch, the inner tube wall between the adjacent two second notches forming a first support portion, the first support portion corresponding to the position of the first notch, the inner tube and the outer tube can be Extrusion expansion, in the first pressing state, the rising portion of the outer tube is deformed outwardly, and the first limiting piece abuts, and in the second pressing state, the first supporting portion of the inner tube The outwardly deforming protrusion and the first limiting piece are opened, so that the struts of the outer tube can continue to deform outwardly.
The height-adjustable vertebral body fusion device according to claim 1, wherein the side portion of the erecting portion is provided with an extending portion, and the two sides of the extending portion are provided with a notch, the first pressing In the state and the second pressing state, the struts are outwardly deformed and convex along the recess.
The height-adjustable vertebral body fusion device according to claim 2, wherein a plurality of the first notches are disposed on the outer tube at intervals in the axial direction, and the plurality of first notches are arranged to be oppositely disposed. Two rows, the outer tube wall between the first notches of the adjacent rows form two rows of the struts, and the inner tube is provided with a plurality of the second notches, a plurality of second notches, spaced apart in the axial direction The two rows are arranged in opposite rows, and the inner tube wall between the second notches of the adjacent columns forms two rows of the first support portions.
The height-adjustable vertebral body fusion device according to claim 3, wherein the outer tube is provided with four rows of third notches in the axial direction, and the outer tube wall between the third indentations of the adjacent columns. Forming four rows of anti-rotation portions, the end portion of the third notch is provided with a second limiting piece extending in the axial direction of the outer tube, and the inner tube is provided with four rows of fourth notches on the axial direction, adjacent The inner tube wall between the fourth notches of the column forms four rows of second support portions, the second support portion corresponding to the position of the third notch, and the anti-rotation portion of the outer tube in the first pressing state Deforming the protrusion outwardly, and the second limiting piece abuts. In the second pressing state, the second supporting portion of the inner tube is outwardly deformed and protrudes and the second limiting piece is opened. The anti-rotation portion of the tube can continue to deform outwardly.
The height-adjustable vertebral body fusion cage according to claim 4, wherein one of said rows of said struts is located between two of said anti-rotation portions, and the other of said struts is located at two other columns of anti-rotation Between the portions, and in the first pressing state and the second pressing state, the highest point of the struts is flush with the highest point of the anti-rotation portion.
The height-adjustable vertebral body fusion device according to claim 5, wherein the anti-rotation portion is disposed at both ends of the outer tube; or in the axial direction, the anti-rotation portion and the erect portion Alternate settings.
The height-adjustable vertebral body fusion device according to claim 5, wherein a central portion of the anti-rotation portion, a middle portion of the first support portion, and a middle portion of the second support portion are provided with an extrusion port. After the anti-rotation portion, the first support portion and the second support portion are pressed, the outer deformation is performed.
The height-adjustable vertebral body fusion device according to claim 4, wherein both ends of the first notch are provided with a first limiting piece, and a squeeze is left between the two first limiting pieces. An interval, wherein a length of the first limiting piece closer to the top end of the outer tube is greater than a length of the other first limiting piece, and a second limiting piece is disposed at both ends of the third notch, and the second limiting piece is disposed A squeezing interval is left between, wherein the length of the second limiting piece closer to the top end of the outer tube is greater than the length of the other second limiting piece.
The height-adjustable vertebral body fusion cage according to any one of claims 1-8, further comprising an inner core, the inner core being disposed in the inner tube, and the outer tube and the inner tube The top end is connected to the top end of the inner core, and the bottom end of the inner core is provided with a thread matching the deformation tool.
The height adjustable vertebral body fusion device according to claim 9, wherein the length of the outer tube is greater than the length of the inner tube, and the length of the inner tube is greater than the length of the inner core, first In the squeezed state, the length of the outer tube is equal to the length of the inner tube, and in the second extruded state, the length of the outer tube and the inner tube is equal to or slightly longer than the inner core.