CN108113782A - Vertebral body fusion cage - Google Patents

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

technical field

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

Background technique

In daily life, cases of vertebral body damage due to tumors, fractures, infections, degenerative lesions and other reasons occur from time to time. When treating these patients, the method used is to implant a fusion device between the damaged vertebral bodies. The bone tissue crawls and replaces, thereby repairing the damaged vertebral body. However, most of the traditional vertebral body fusion devices are large in size, which makes the surgical incision also large. Therefore, they all cause greater damage to the patient's body and affect the success rate of healing.

Contents of the invention

Based on this, the present invention overcomes the defects of the prior art and provides a vertebral body fusion device, which can reduce the damage to the bone during the operation and can effectively avoid piercing the patient's vertebral body endplate, thereby reducing the damage to the patient's body .

A vertebral body fusion device, comprising an expandable tube, the expandable tube is provided with a plurality of first gaps arranged at intervals, and the tube wall between two adjacent first gaps forms a propping part, and the propping up The side part of the tube is provided with an extension part, and the expandable tube can be squeezed and expanded. When in an expanded state, the propping part and the extension part deform and protrude outward.

When in use, the undeformed vertebral body fusion device is gradually implanted between the vertebral bodies from the top to the bottom through the deformation tool, and then the bottom end of the expandable tube is squeezed through the deformation tool, because the side of the propping part There is an extension part, so that the propping part of the expandable tube is deformed and protruded outward along both sides of the extension part, and the propping part corresponding to the extension part is the highest point after deformation, and the propping part at the highest point is connected with the extension part. Together, they form a support surface for supporting the endplate of the vertebral body, increase the contact area with the endplate of the vertebral body, improve the stability of the support, ensure the adjustment and strength of the support height, and avoid the protrusion of the highest point of the support part from piercing the vertebral body. The body endplate, which causes damage to the patient's body, effectively guarantees the success rate of healing. Moreover, the vertebral body fusion device has a simple structure and a small volume before deformation, which can reduce damage to the bone during the operation, and the implantation wound of the patient requiring an incision is small, and the damage to the patient is small.

Further, notches are formed on both sides of the extension part, and in the expanded state, the propping part deforms and protrudes outward along the notches.

Further, the expandable tube is provided with two rows of first notches at intervals along the axial direction, and the two rows of first notches are oppositely arranged, and the tube wall between the first notches of adjacent rows forms the propping portion .

Further, the expandable tube is also provided with four rows of second gaps arranged in the axial direction, and the four rows of second gaps are arranged at intervals around the circumference of the expandable tube. The pipe wall of the pipe forms an anti-rotation part, and when in an expanded state, the anti-rotation part deforms and protrudes outward.

Further, one row of propping parts is located between two rows of anti-rotation parts, the other row of propping parts is located between the other two rows of anti-rotation parts, and in the expanded state, the highest point of the propping parts flush with the highest point of the anti-rotation section.

Further, four rows of the second notches are evenly spaced around the circumference of the expandable tube; or two rows of the second notches are oppositely arranged, and the other two rows of the second notches are oppositely arranged.

Further, an extrusion opening is opened in the middle of the anti-rotation part.

Further, the second notches are provided at both ends of the expandable tube; or in the axial direction, the second notches are arranged alternately with the first notches.

Further, both ends of the first notch are provided with first limiting pieces, and there is an extrusion space between the two first limiting pieces, and both ends of the second notch are provided with second limiting pieces. sheet, and there is an extrusion interval between the two second limiting sheets.

Further, the vertebral body fusion device also includes an inner core, the inner core is arranged in the expandable tube, and the top end of the expandable tube is connected to the top end of the inner core, and the bottom of the inner core The end is threaded to match the deformation tool.

Description of drawings

Fig. 1 is a schematic structural view of the undeformed vertebral body fusion device according to an embodiment of the present invention;

Fig. 2 is a structural schematic diagram of the expandable tube in the vertebral body fusion device shown in Fig. 1;

Fig. 3 is a structural schematic diagram of the inner core in the vertebral fusion device shown in Fig. 1;

Fig. 4 is a structural schematic view of the expanded state of the vertebral body fusion device shown in Fig. 1;

Fig. 5 is a structural schematic diagram of the expandable tube in the vertebral body fusion device shown in Fig. 4;

Fig. 6 is a schematic structural view of the undeformed vertebral body fusion device according to another embodiment of the present invention;

Fig. 7 is a structural schematic diagram of the expandable tube in the vertebral body fusion device shown in Fig. 6;

Fig. 8 is a structural schematic view of the expanded state of the vertebral fusion cage shown in Fig. 6;

Fig. 9 is a schematic structural view of the expandable tube in the vertebral fusion cage shown in Fig. 8 .

Explanation of reference signs:

10. Expandable tube, 110, first notch, 112, first limiting piece, 120, propping part, 130, extension part, 132, notch, 140, second notch, 142, second limiting piece, 150, anti-rotation portion, 152, extrusion mouth, 20, inner core, 210, even pull.

Detailed ways

In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. Preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

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 there can also be an intervening element. 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 similar expressions are used herein for purposes of illustration only and are not intended to represent the only embodiments.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terminology used herein in the description of the present invention is only for the purpose of describing specific embodiments, and is not intended to limit the present 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 Figures 1-5, an embodiment provides a vertebral body fusion device, which includes an expandable tube 10, and a plurality of first notches 110 arranged at intervals are opened on the expandable tube 10, and two adjacent first notches 110 are provided. The tube wall between the gaps 110 forms a propping part 120, and the side of the propping part 120 is provided with an extension part 130, and the expandable tube 10 can be squeezed and expanded. When in an expanded state, the propping part 120 And the extension part 130 deforms and protrudes outward.

When in use, the undeformed vertebral body fusion device is gradually implanted between the vertebral bodies from the top end to the bottom end through the deformation tool, and then the bottom end of the expandable tube 10 is squeezed through the deformation tool, due to the support portion 120 The side part is provided with an extension part 130, so that the propping part 120 of the expandable tube 10 deforms and protrudes outward along both sides of the extension part 130, and the propping part 120 corresponding to the extension part 130 is the highest point after deformation, increasing The contact area between the large vertebral body fusion cage and the vertebral body endplate in the axial direction, and because the extension part 130 is located on the side of the highest point support part 120, the contact area between the vertebral body fusion cage and the vertebral body endplate in the radial direction is increased area, so that the supporting part 120 and the extension part 130 at the highest point form a supporting surface for supporting the endplate of the vertebral body, so that the area in contact with the endplate of the vertebral body increases from both radial and axial directions, which not only improves The stability of the support ensures the adjustment and strength of the support height, avoids the highest point of the support part from piercing the vertebral endplate, causing damage to the patient's body, and effectively guarantees the success rate of the cure. Moreover, the vertebral body fusion device has a simple structure and a small volume before deformation, which can reduce damage to the bone during the operation, and the implantation wound of the patient requiring an incision is small, and the damage to the patient is small. The deformed vertebral body fusion cage has a larger internal space for bone grafting and a higher healing rate. The extension part 130 is formed by cutting the tube wall of the expandable tube 10 in the first gap 110 .

Further, as shown in FIGS. 1 and 2 , notches 132 are formed on both sides of the extension part 130 , and in the expanded state, the propping part 120 deforms and protrudes outward along the notches 132 . When the expandable tube 10 is squeezed, the strength of the notch 132 is smaller than that of other parts of the stretching part, and the propping part 120 can expand and deform outward along the notch 132 to ensure the propping up between the two notches 132 The part 120 is the highest point after deformation, so as to form a support surface together with the extension part 130, and increase the contact area with the endplate of the vertebral body.

Specifically, as shown in Figures 1-4, the expandable tube 10 of this embodiment is provided with two rows of first notches 110 at intervals along the axial direction, and the two rows of first notches 110 are arranged opposite to each other. The tube wall between the first gaps 110 forms the propping portion 120 . That is, the two rows of propping parts 120 are deformed to form two rows of projections that are oppositely arranged, and the projections in each row are arranged at intervals to support the upper plate and the lower plate of the endplate of the vertebral body respectively.

Further, the expandable tube 10 is also provided with four rows of second notches 140 arranged in the axial direction, the four rows of second notches 140 are arranged at intervals around the circumference of the expandable tube 10 , and the first notches 140 of adjacent rows The tube wall between the two notches 140 forms an anti-rotation portion 150 , and when in an expanded state, the anti-rotation portion 150 deforms and protrudes outward. When the expandable tube 10 is squeezed and deformed, the four rows of anti-rotation parts 150 expand and deform outwards. Viewed from one end of the expandable tube 10 to the other end, the four rows of anti-rotation parts 150 form a cross shape, which can play a supporting role on the one hand. The role of the endplate of the vertebral body, on the other hand, prevents the expandable tube 10 from rotating, so that the two propping parts 120 of the expandable tube 10 can firmly lift up the endplate of the vertebral body.

Further, one row of propping parts 120 is located between two rows of anti-rotation parts 150, and the other row of propping parts 120 is located between the other two rows of anti-rotation parts 150. The highest point of the portion 120 is flush with the highest point of the anti-rotation portion 150 . After deformation, two rows of anti-rotation parts 150 are supported on the lower plate of the vertebral endplate, and the other two rows of anti-rotation parts 150 are supported on the upper plate of the vertebral body endplate. Optionally, the four rows of the second notches 140 are evenly spaced around the circumference of the expandable tube 10, that is, the four rows of anti-rotation parts 150 are evenly arranged around the circumference of the expandable tube 10, and the adjacent anti-rotation parts after deformation 150 are at an angle of 90°; or two rows of the second notches 140 are arranged oppositely, and the other two rows of the second notches 140 are arranged oppositely, that is, two rows of the four rows of anti-rotation parts 150 are arranged oppositely, and the other two rows of the second notches 140 are arranged oppositely. The columns are set relative to each other to form support corresponding to the upper and lower sides.

Further, as shown in FIGS. 1 , 2 , 6 and 7 , an extrusion opening 152 is opened in the middle of the anti-rotation portion 150 . The extrusion opening 152 is formed by cutting the middle part of the anti-rotation part 150. The strength of the extrusion opening 152 is lower than that of other parts of the anti-rotation part 150, and it is easy to deform outward along the extrusion opening 152 during the extrusion process. raised.

Further, both ends of the first notch 110 are provided with a first limiting piece 112, corresponding to the extrusion interval left between the two first limiting pieces 112, both ends of the second notch 140 are provided with There are second limiting pieces 142 , and there is an extrusion space between the two second limiting pieces 142 . In the expanded state, since the expandable tube 10 is compressed and deformed, the corresponding two first limiting pieces 112 and the corresponding two second limiting pieces 142 gradually move closer until they abut against each other. At this time, the expandable tube 10 can no longer be squeezed out of shape. Optionally, the first limiting piece 112 can also be provided only at 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; One end of the notch 140 is provided with a second limiting piece 142 , and the second limiting piece 142 abuts against the other end of the first notch 110 in an expanded state.

Further, the vertebral body fusion device further includes an inner core 20, the inner core 20 is arranged in the expandable tube 10, and the top end of the expandable tube 10 is connected to the top end of the inner core 20, The bottom end of the inner core 20 is provided with threads matched with the deformation tool. The top of the inner core 20 is provided with a connecting lever 210, the bottom of the inner core 20 is provided with a threaded hole (not shown in the figure), and the top of the expansion tube is welded on the connecting lever 210, both To form a fixed connection, the threaded hole is threadedly matched with the deforming tool. When deforming, the center core of the deforming tool pulls the inner core 20 and the top of the expandable tube 10, and then the deforming tool can touch the bottom of the expandable tube 10. Squeeze the ends of the expandable tube 10 so that the two ends of the expandable tube 10 are forced against each other, thereby expanding and deforming. The expansion process starts from the top of the expandable tube 10 and gradually deforms. The inner core 20 is set, on the one hand, it is convenient to be connected with the deformation tool, on the other hand, it improves the strength of the entire vertebral body cage, and makes the inside of the expandable tube 10 filled to avoid its inward deformation and protrusion. According to actual needs, threads can be directly provided on the inner wall of the expandable tube 10 to cooperate with the deformation tool to meet extrusion demands.

Specifically, the length of the expandable tube 10 is greater than the length of the inner core 20 , and in the expanded state, the length of the expandable tube 10 is the same as the inner tube or slightly longer than the inner core 20 . In this way, when in use, the vertebral fusion cage has a more compact structure and is more convenient to use. At the same time, it is convenient for the deforming tool to align with the bottom end of the expandable tube 10 for extrusion.

Further, the material of the vertebral body fusion device is made of SUS304, PEEK, titanium alloy or trabecular bone metal and other materials that meet the standards for implanting medical devices, and the surface treatment methods can be polishing, frosting, plasma spraying, spraying nano-coating, etc. . The expandable tube 10 and the inner core 20 in this embodiment are cylinders, and may also be cuboids or cubes according to requirements.

In one embodiment, as shown in FIGS. 1-5 , the second notch 140 is opened at both ends of the expandable tube 10 , that is, the anti-rotation portion 150 is provided at both ends of the expandable tube 10 , An anti-rotation part 150 is provided near the top end and the bottom end of the expandable tube 10 to form two cross-shaped structures to prevent rotation of the vertebral fusion cage. In another implementation, as shown in FIGS. 6-9 , in the axial direction, the second notches 140 are arranged alternately with the first notches 110 , that is, the anti-rotation parts 150 and the propping parts 120 are arranged alternately. After a cross-shaped structure formed by four anti-rotation parts 150, a straight-shaped structure formed by two propping parts 120 is arranged, and then a cross-shaped structure is arranged, and a straight-shaped structure is arranged again, and so on. The number and arrangement order of the cross-shaped structure and the one-word structure can be set as required.

The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, should be considered as within the scope of this specification.

The above-mentioned embodiments only express several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but should not be construed as limiting the patent scope of the invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (10)

1. A vertebral body fusion device, characterized in that it comprises an expandable tube, the expandable tube is provided with a plurality of first gaps arranged at intervals, and the tube wall between two adjacent first gaps forms a brace The side part of the propping part is provided with an extending part, and the expandable tube can be squeezed and expanded. In the expanded state, the propping part and the extending part deform and protrude outward. 2 . The vertebral body fusion device according to claim 1 , wherein notches are formed on both sides of the extension part, and when in an expanded state, the propping part deforms and protrudes outward along the notch. 3 . 3. The vertebral body fusion device according to claim 2, characterized in that, the expandable tube is provided with two rows of the first gaps at intervals along the axial direction, the two rows of first gaps are arranged oppositely, and the adjacent rows The tube wall between the first gaps forms the propped up portion. 4. The vertebral body fusion device according to claim 3, wherein the expandable tube is also provided with four rows of second gaps arranged in the axial direction, and the four rows of second gaps surround the expandable tube. The circumferential intervals are arranged, and the tube wall between the second gaps in adjacent columns forms an anti-rotation part, and when in an expanded state, the anti-rotation part deforms and protrudes outward. 5. The vertebral body fusion device according to claim 4, wherein one row of the propping parts is located between two rows of the anti-rotation parts, and the other row of propping parts is located between the other two rows of anti-rotation parts In the expanded state, the highest point of the propping part is flush with the highest point of the anti-rotation part. 6. The vertebral body fusion device according to claim 5, wherein four rows of said second gaps are evenly spaced around the circumference of the expandable tube; or wherein two rows of said second gaps are oppositely arranged, and the other two rows The second notch is arranged opposite to each other. 7 . The vertebral body fusion device according to claim 6 , wherein an extrusion opening is opened in the middle of the anti-rotation part. 8 . 8. The vertebral body fusion device according to claim 7, characterized in that, the second notch is opened at both ends of the expandable tube; or in the axial direction, the second notch alternates with the first notch set up. 9. The vertebral body fusion device according to claim 8, characterized in that, both ends of the first notch are provided with first limiting pieces, and there is an extrusion interval between the two first limiting pieces, Both ends of the second notch are provided with second limiting pieces, and there is an extrusion space between the two second limiting pieces. 10. The vertebral body fusion device according to any one of claims 1-9, characterized in that it also includes an inner core, the inner core is arranged in the expandable tube, and the top end of the expandable tube is connected to the The top end of the inner core is connected, and the bottom end of the inner core is provided with a thread matched with the deformation tool.