CN108113782B

CN108113782B - Vertebral body fusion cage

Info

Publication number: CN108113782B
Application number: CN201711322705.5A
Authority: CN
Inventors: 赵汝琛; 托维.希文
Original assignee: Asi Medical Technologies Ltd
Current assignee: Asi Medical Technologies Ltd
Priority date: 2017-12-12
Filing date: 2017-12-12
Publication date: 2020-07-03
Anticipated expiration: 2037-12-12
Also published as: CN108113782A

Abstract

The invention relates to a vertebral body fusion cage, which comprises an expandable tube, wherein a plurality of first gaps are formed in the expandable tube at intervals, a supporting part is formed on the tube wall between every two adjacent first gaps, an extending part is arranged on the side part of the supporting part, the expandable tube can be extruded and expanded, and in an expansion state, the supporting part and the extending part are outwards deformed and protruded. The extension parts are arranged on the side parts of the supporting parts, so that the supporting parts of the expandable tube are outwards deformed and protruded along the two sides of the extension parts, the supporting parts corresponding to the extension parts are the highest points after deformation, the supporting parts at the highest points and the extension parts form a supporting surface for supporting the vertebral body end plate together, the contact area between the supporting surface and the vertebral body end plate is increased, the supporting stability is improved, the adjustment and the strength of the supporting height are ensured, the vertebral body end plate is prevented from being pierced by the protruded highest points of the supporting parts, the injury to the body of a patient is avoided, and the cure success rate is effectively ensured.

Description

Vertebral body fusion cage

Technical Field

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

Background

In daily life, the case that the centrum is damaged because of reasons such as tumour, fracture, infection, degenerative disease takes place occasionally, when these patients are treated, the mode of adoption is that a fusion cage is implanted between the centrum that damages, make bone tissue produce and crawl and replace, thereby repair the centrum that damages, however most outward appearance of traditional centrum fusion cage is great, make the operation incision also very big, and the less centrum fusion cage of general appearance causes centrum end plate damage easily, consequently all causes great damage to patient's health, influence the success rate of healing.

Disclosure of Invention

Based on the above, the present invention provides a vertebral body fusion device, which can reduce the damage to the bone during the operation and effectively avoid the puncture of the vertebral body end plate of the patient, thereby reducing the damage to the body of the patient.

The utility model provides a centrum fusion cage, includes the expandable tube, but set up a plurality of first breachs that the interval set up on the expandable tube, the pipe wall between two adjacent first breachs in the circumference forms props up the portion, the lateral part of propping up the portion is equipped with the extension, but the expandable tube can be by extrusion inflation, during the inflation state, prop up portion and extension and outwards warp the arch.

When the device is used, the undeformed vertebral body fusion cage is gradually implanted between the vertebral bodies from the top end to the bottom end through the deformation tool, then the bottom end of the expandable tube is extruded through the deformation tool, the extension part is arranged on the side part of the supporting part, the supporting part of the expandable tube is outwards deformed and protruded along the two sides of the extension part, the supporting part corresponding to the extension part is the highest point after deformation, the supporting part at the highest point is together with the extension part to form a supporting surface for supporting the vertebral body end plate, the contact area between the supporting part and the vertebral body end plate is increased, the supporting stability is improved, the adjustment and the strength of the supporting height are ensured, the phenomenon that the vertebral body end plate is pierced by the protrusion at the highest point of the supporting part is avoided, the injury is caused. And the vertebral body fusion cage has simple structure and small volume before deformation, can reduce the damage to bones in the operation process, and has small implanted wound of a patient needing an incision and small damage to the patient.

Furthermore, notches are formed in two sides of the extending portion, and when the expansion part is in an expansion state, the supporting portion deforms outwards along the notches to form protrusions.

Furthermore, two rows of the first gaps are arranged on the expandable pipe at intervals along the axial direction, the two rows of the first gaps are arranged oppositely, and the pipe wall between the adjacent rows of the first gaps forms the supporting part.

Furthermore, four rows of second notches arranged along the axial direction are further formed in the expandable pipe, the four rows of second notches are arranged at intervals around the circumferential direction of the expandable pipe, anti-rotation parts are formed on pipe walls between the second notches of the adjacent rows, and the anti-rotation parts are outwards deformed and protruded in the expansion state.

Furthermore, one row of the supporting parts is positioned between two rows of the anti-rotation parts, the other row of the supporting parts is positioned between the other two rows of the anti-rotation parts, and in an expansion state, the highest point of the supporting parts is flush with the highest point of the anti-rotation parts.

Furthermore, four rows of the second gaps are uniformly arranged around the circumference of the expandable pipe at intervals; or the two rows of second gaps are oppositely arranged, and the other two rows of second gaps are oppositely arranged.

Furthermore, the middle part of the anti-rotation part is provided with an extrusion opening.

Further, the second notch is formed in two ends of the expandable pipe; or in the axial direction, the second gaps and the first gaps are alternately arranged.

Further, the both ends of first breach all are equipped with first spacing piece, leave the extrusion interval between two first spacing pieces, the both ends of second breach all are equipped with the spacing piece of second, leave the extrusion interval between two spacing pieces of second.

Further, the vertebral body fusion cage further comprises an inner core, the inner core is arranged in the expandable tube, the top end of the expandable tube is connected with the top end of the inner core, and the bottom end of the inner core is provided with threads matched with the deformation tool.

Drawings

FIG. 1 is a schematic view of an undeformed vertebral body cage according to one embodiment of the present invention;

FIG. 2 is a schematic view of the expandable tube in the vertebral body cage of FIG. 1;

FIG. 3 is a schematic view of the configuration of the inner core of the vertebral body cage of FIG. 1;

FIG. 4 is a schematic view of the vertebral body cage of FIG. 1 in an expanded configuration;

FIG. 5 is a schematic view of the expandable tube in the vertebral body cage of FIG. 4;

FIG. 6 is a schematic view of an undeformed vertebral body cage according to another embodiment of the present invention;

FIG. 7 is a schematic view of the expandable tube in the vertebral body cage of FIG. 6;

FIG. 8 is a schematic view of the vertebral body cage of FIG. 6 in an expanded configuration;

fig. 9 is a schematic view of the expandable tube in the vertebral body cage of fig. 8.

Description of reference numerals:

10. the expansion pipe comprises an expansion pipe body, 110, a first notch, 112, a first limiting piece, 120, a supporting portion, 130, an extending portion, 132, a notch, 140, a second notch, 142, a second limiting piece, 150, an anti-rotation portion, 152, an extrusion opening, 20, an inner core, 210 and a connecting plate.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, 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. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1 to 5, an embodiment provides a vertebral body fusion cage, which includes an expandable tube 10, the expandable tube 10 is provided with a plurality of first notches 110 arranged at intervals, a supporting portion 120 is formed on a tube wall between two circumferentially adjacent first notches 110, a side portion of the supporting portion 120 is provided with an extending portion 130, the expandable tube 10 can be extruded and expanded, and in an expanded state, the supporting portion 120 and the extending portion 130 are deformed and raised outwards.

When the device is used, an undeformed vertebral body fusion cage is gradually implanted between vertebral bodies from the top end to the bottom end through a deformation tool, then the bottom end of the expandable tube 10 is extruded through the deformation tool, because the side part of the propping part 120 is provided with the extending part 130, the propping part 120 of the expandable tube 10 is outwards deformed and protruded along the two sides of the extending part 130, the propping part 120 corresponding to the extending part 130 is the highest point after deformation, the contact area between the axial direction of the vertebral body fusion cage and the vertebral body end plate is increased, meanwhile, because the extending part 130 is positioned at the side part of the highest point propping part 120, the contact area between the radial direction of the vertebral body fusion cage and the vertebral body end plate is increased, so that the propping part 120 at the highest point and the extending part 130 form a supporting surface for supporting the vertebral body end plate together, the contact area between the vertebral body end plate is increased from the radial direction and the axial direction, the supporting stability is improved, and the, the phenomenon that the highest point bulge of the expanded vertebral fusion cage pierces the vertebral end plate is avoided, the body of a patient is damaged, and the cure success rate is effectively guaranteed. And the vertebral body fusion cage has simple structure and small volume before deformation, can reduce the damage to bones in the operation process, and has small implanted wound of a patient needing an incision and small damage to the patient. The deformed vertebral body fusion cage has larger internal bone grafting space and higher healing success rate. The extension 130 is cut from the wall of the expandable tubular 10 within the first notch 110.

Further, as shown in fig. 1 and 2, notches 132 are formed on two sides of the extending portion 130, and in the expanded state, the supporting portion 120 deforms and protrudes outward along the notches 132. When the expandable tube 10 is compressed, the strength of the notch 132 is lower than that of the rest of the propping portion, and the propping portion 120 can expand and deform outwards along the notch 132, so that the propping portion 120 between the two notches 132 is ensured to be the highest point after deformation, thereby forming a supporting surface together with the extension portion 130 and increasing the contact area with the vertebral body endplate.

Specifically, as shown in fig. 1 to 4, two rows of the first notches 110 are arranged on the expandable tubular 10 at intervals along the axial direction, the two rows of the first notches 110 are arranged oppositely, and the tubular wall between the adjacent rows of the first notches 110 forms the supporting portion 120. That is, two rows of the supporting parts 120 form two rows of protrusions which are oppositely arranged after being deformed, and the protrusions in each row are arranged at intervals and are respectively used for supporting the upper plate and the lower plate of the vertebral body endplate.

Furthermore, four rows of second notches 140 are further formed in the expandable pipe 10 and arranged along the axial direction, the four rows of second notches 140 are arranged at intervals around the circumference of the expandable pipe 10, anti-rotation portions 150 are formed on pipe walls between adjacent rows of second notches 140, and in the expanded state, the anti-rotation portions 150 are deformed and protruded outwards. When the expandable tube 10 is deformed by extrusion, the four rows of anti-rotation portions 150 are deformed by expansion, and when viewed from one end of the expandable tube 10 to the other end, the four rows of anti-rotation portions 150 form a cross shape, so that the expandable tube 10 can support vertebral endplates and prevent the expandable tube 10 from rotating, and the two support portions 120 of the expandable tube 10 can stably support the vertebral endplates.

Further, one row of the supporting portions 120 is located between two rows of the anti-rotation portions 150, the other row of the supporting portions 120 is located between the other two rows of the anti-rotation portions 150, and in the expanded state, the highest point of the supporting portions 120 is flush with the highest point of the anti-rotation portions 150. Two of the rows of deformed anti-rotation portions 150 are supported on the lower plate of the vertebral endplates, and the other two rows of anti-rotation portions 150 are supported on the upper plate of the vertebral endplates. Optionally, four rows of the second notches 140 are uniformly spaced around the circumference of the expandable tubular 10, that is, four rows of the anti-rotation parts 150 are uniformly arranged around the circumference of the expandable tubular 10, and after deformation, adjacent anti-rotation parts 150 form an included angle of 90 degrees; or two of the two rows of the second notches 140 are oppositely arranged, and the other two rows of the second notches 140 are oppositely arranged, that is, two of the four rows of the anti-rotation parts 150 are oppositely arranged, and the other two rows are oppositely arranged to form corresponding supports up and down.

Further, as shown in fig. 1, 2, 6 and 7, the anti-rotation portion 150 is provided with an extrusion opening 152 at a middle portion thereof. The extrusion opening 152 is formed by cutting and recessing the middle parts of the two sides of the anti-rotation part 150, the strength of the extrusion opening 152 is smaller than that of the other parts of the anti-rotation part 150, and the extrusion opening 152 is convenient to deform and bulge outwards in the extrusion process.

Further, the two ends of the first notch 110 are both provided with first limiting pieces 112, an extrusion interval is left between the two corresponding first limiting pieces 112, the two ends of the second notch 140 are both provided with second limiting pieces 142, and an extrusion interval is left between the two corresponding second limiting pieces 142. In the expanded state, since the expandable tubular 10 is compressed and deformed, the two first limiting pieces 112 and the two second limiting pieces 142 are gradually drawn together until abutting against each other, and at this time, the expandable tubular 10 cannot be extruded and deformed. Optionally, a first limiting piece 112 may be disposed at only one end of the first notch 110, and the first limiting piece 112 abuts against the other end of the first notch 110 in the expanded state; the second stopper 142 may be disposed at only one end of the second notch 140, and the second stopper 142 may abut against the other end of the first notch 110 in the expanded state.

Further, the vertebral body fusion device further comprises an inner core 20, wherein the inner core 20 is arranged in the expandable tube 10, the top end of the expandable tube 10 is connected with the top end of the inner core 20, and the bottom end of the inner core 20 is provided with threads matched with a deformation tool. The top end of the inner core 20 is provided with a connecting plate 210, the bottom end of the inner core 20 is provided with a threaded hole (not shown in the figure), the top end of the expansion pipe is welded on the connecting plate 210, the threaded hole and the deformation tool are in threaded fit, when the expansion pipe is deformed, the middle core of the deformation tool pulls the top ends of the inner core 20 and the expansion pipe 10, then the deformation tool can extrude the bottom end of the expansion pipe 10, so that the two ends of the expansion pipe 10 are stressed oppositely, and the expansion pipe is expanded and deformed gradually from the top end of the expansion pipe 10. The inner core 20 is provided to facilitate the engagement with the deforming tool on the one hand and to improve the strength of the entire vertebral fusion cage on the other hand, and to fill the interior of the expandable tube 10 to prevent it from being deformed inwardly and bulging. According to actual requirements, threads can be directly arranged on the inner wall of the expandable pipe 10 to be matched with a deformation tool, so that the extrusion requirement is met.

Specifically, the length of the expandable tubular 10 is greater than the length of the inner core 20, and in the expanded state, the length of the expandable tubular 10 is slightly greater than the length of the inner tubular or core 20. Therefore, when in use, the vertebral body fusion cage has a more compact structure and is more convenient to use, and meanwhile, the deformation tool is convenient to align with the bottom end of the expandable tube 10 for extrusion.

Furthermore, the material of the vertebral body fusion device adopts SUS304, PEEK, titanium alloy or trabecular bone metal and other materials which meet the standard of implanted medical instruments, and the surface treatment mode can be polishing, frosting, plasma spraying, nano coating spraying and other modes. The expandable tube 10 and the inner core 20 of this embodiment are cylinders, and may be rectangular or square according to requirements.

In one embodiment, as shown in fig. 1-5, the second notches 140 are opened at both ends of the expandable tube 10, that is, the anti-rotation portions 150 are disposed at both ends of the expandable tube 10, and the anti-rotation portions 150 are disposed at positions near the top end and the bottom end of the expandable tube 10, so as to form two cross-shaped structures, which play a role in preventing the vertebral fusion device from rotating. In another embodiment, as shown in fig. 6 to 9, in the axial direction, the second notches 140 and the first notches 110 are alternately arranged, that is, the anti-rotation portions 150 and the supporting portions 120 are alternately arranged, after a cross-shaped structure formed by four anti-rotation portions 150 is arranged, a line-shaped structure formed by two supporting portions 120 is arranged, then the cross-shaped structure is arranged, a line-shaped structure is arranged, and so on. The number and the arrangement sequence of the cross-shaped structures and the straight-line structures can be set according to requirements.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The utility model provides a vertebral body fusion cage, its characterized in that includes the expandable tube, but set up a plurality of first breachs that the interval set up on the expandable tube, the pipe wall between two adjacent first breachs in the circumference forms props up the portion, the lateral part of propping up the portion is equipped with the extension, and the extension is formed by the pipe wall cutting of the intraformational expandable tube in the first breach, but the expandable tube can be extruded inflation, and during the inflation state, prop up portion and extension and outwards warp protrudingly, prop up the portion for the peak after the deformation with the extension that corresponds, the portion of propping up of peak department is together with the extension, forms the holding surface that is used for supporting the centrum terminal plate.

2. The vertebral body fusion cage of claim 1 wherein said extension is notched on either side thereof and said expansion portion deforms outwardly along said notches in the expanded state.

3. The vertebral body fusion device of claim 2 wherein said expandable tube has two spaced rows of said first notches disposed opposite one another in an axial direction.

4. The vertebral body fusion cage of claim 3 further comprising four rows of second notches axially disposed in the expandable tubular, wherein the four rows of second notches are circumferentially spaced around the expandable tubular, and wherein the walls of the second notches in adjacent rows form anti-rotation portions that deform outwardly to bulge when in the expanded state.

5. The vertebral fusion cage of claim 4 wherein one of the rows of said struts is between two of the rows of said anti-rotation portions and the other row of struts is between the other two rows of anti-rotation portions and wherein in the expanded state the highest point of said struts is level with the highest point of said anti-rotation portions.

6. The vertebral body fusion device of claim 5 wherein four columns of said second indentations are evenly spaced around the circumference of the expandable tube.

7. The vertebral fusion device of claim 5 wherein two of said columns of second openings are oppositely disposed and two other columns of said second openings are oppositely disposed.

8. The vertebral body fusion cage of claim 6 or 7 wherein the anti-rotation portion has an extrusion port formed in the middle thereof.

9. The vertebral body fusion device of claim 8 wherein said second notch opens at both ends of said inflatable tube.

10. The vertebral body fusion device of claim 8 wherein the second notches alternate with the first notches in the axial direction.

11. The vertebral fusion cage of claim 9 wherein both ends of the first notch are provided with first limiting pieces, an extrusion gap is left between the two first limiting pieces, both ends of the second notch are provided with second limiting pieces, and an extrusion gap is left between the two second limiting pieces.

12. The vertebral fusion cage of claim 10 wherein both ends of the first notch are provided with a first stop tab leaving an extrusion gap therebetween, and both ends of the second notch are provided with a second stop tab leaving an extrusion gap therebetween.

13. The vertebral body fusion device according to any one of claims 1-7 further comprising an inner core disposed within the expandable tube with a top end of the expandable tube connected to a top end of the inner core, a bottom end of the inner core being threaded for mating with a deformation tool.

14. The vertebral body fusion device of claim 8 further comprising an inner core disposed within the expandable tube with a top end of the expandable tube connected to a top end of the inner core, a bottom end of the inner core being threaded to mate with a deformation tool.

15. The vertebral body fusion device of claim 9 further comprising an inner core disposed within the expandable tube with a top end of the expandable tube connected to a top end of the inner core, a bottom end of the inner core being threaded to mate with a deformation tool.

16. The vertebral body fusion device of claim 10 further comprising an inner core disposed within the expandable tube with a top end of the expandable tube connected to a top end of the inner core, a bottom end of the inner core being threaded to mate with a deformation tool.

17. The vertebral body fusion device of claim 11 further comprising an inner core disposed within the expandable tube with a top end of the expandable tube connected to a top end of the inner core, a bottom end of the inner core being threaded to mate with a deformation tool.

18. The vertebral body fusion device of claim 12 further comprising an inner core disposed within the expandable tube with a top end of the expandable tube connected to a top end of the inner core, a bottom end of the inner core being threaded to mate with a deformation tool.