CN109172055B

CN109172055B - Posterior lumbar fusion cage assembly

Info

Publication number: CN109172055B
Application number: CN201811184601.7A
Authority: CN
Inventors: 赵杰; 吴爱悯; 张凯; 田海军; 程晓非; 周唐骏; 李训林; 韩辰; 陈辰; 陈智谦; 周益帆; 杨骁�
Original assignee: Ninth Peoples Hospital Shanghai Jiaotong University School of Medicine
Current assignee: Ninth Peoples Hospital Shanghai Jiaotong University School of Medicine
Priority date: 2018-10-11
Filing date: 2018-10-11
Publication date: 2020-11-24
Anticipated expiration: 2038-10-11
Also published as: CN109172055A

Abstract

The invention discloses a rear-entering type lumbar fusion cage assembly which comprises a fusion cage body, wherein the fusion cage body is provided with a holding hole and is arranged in the middle of the rear side of the fusion cage body; the groove is arranged on the rear side of the fusion cage body; the knocking part is arranged at the bottom of the groove; the opening is formed in the rear side of the fusion cage body; and the notch is arranged on the hole edge of the opening. According to the rear-in type lumbar fusion cage assembly, the beating part in the groove is provided with two-direction ladder designs, one ladder is matched with the beating device on the side surface and is beaten towards the side; the other is a ladder matched with the knocker on the tail end, and the ladder is knocked forwards, so that the fusion device body can be implanted conveniently.

Description

Posterior lumbar fusion cage assembly

Technical Field

The invention relates to the field of medical equipment and the like, in particular to a posterior-entering lumbar fusion cage assembly.

Background

With the increasing aging of the global population, the incidence rate of lumbar degenerative diseases is increasing, and the world disease burden shows that lumbago is the leading cause of the loss of labor force of human beings. Eventually many patients require surgical treatment. The lumbar interbody fusion has definite curative effect, has been applied for hundreds of years and is a main means for treating the diseases.

Currently, the widely used lumbar interbody fusion procedure includes: 1. anterior lumbar interbody fusion: entering the intervertebral space from the front can more effectively expand and restore the height of the intervertebral space, and meanwhile, the anterior approach can more thoroughly clear the degenerated intervertebral disc, but the anterior approach is easy to damage the great vessels and the sympathetic plexus, so that complications such as retrograde ejaculation, dysuria and the like are caused. 2. The lateral or lateral anterior approach lumbar interbody fusion technique can be used for placing a larger transverse interbody fusion device through the lateral lumbar major or anterior approach of the lumbar major, and has better biomechanical supporting effect but has the risks of damaging abdominal viscera, the femoral reproductive nerves, the lumbar plexus and the like. 3. Posterior lumbar interbody fusion: intervertebral fusion is accomplished via the posterior spinal canal to achieve stabilization of the anterior-medial column of the lumbar spine. The defects are that the lumbar vertebra is limited to the lower lumbar horizontal position, the intervertebral fusion device is not placed in a large size, and the mechanical support is worse than the lateral approach or the anterior approach. 4. Transforaminal approach lumbar interbody fusion: enter the lumbar intervertebral space from the unilateral intervertebral foramen access to complete a series of processes such as discectomy, bone grafting, intervertebral fusion device implantation and the like. The transforaminal approach lumbar interbody fusion avoids the risks of damaging large blood vessels, sympathetic plexus, abdominal organs, genital femoral nerves and the like caused by the anterior lumbar interbody fusion and the lateral or lateral anterior approach lumbar interbody fusion, but does not have the strength of the lateral or lateral anterior approach lumbar interbody fusion device for supporting intervertebral space on the anterior support. In order to exert the advantages of the transforaminal approach lumbar interbody fusion and avoid the defect of poor supporting effect of the anterior lumbar intervertebral space, researchers invented a kidney-type or banana-type interbody fusion cage, which is more symmetrical in support but still cannot achieve the mode of supporting epiphyseal rings on two sides.

Disclosure of Invention

The purpose of the invention is: provides a posterior lumbar fusion cage component, which aims to solve the defects that the existing lumbar fusion cage is difficult to implant and has poor lumbar space supporting effect and the like.

The technical scheme for realizing the purpose is as follows: the invention provides a posterior lumbar fusion cage assembly, which comprises a fusion cage body, wherein the fusion cage body is provided with a holding hole and is arranged in the middle of the rear side of the fusion cage body; the groove is arranged on the rear side of the fusion cage body; the knocking part is arranged at the bottom of the groove; the opening is formed in the rear side of the fusion cage body; and the notch is arranged on the hole edge of the opening.

In an embodiment of the invention, the fusion cage body is an annular fusion cage body for 3D printing, and comprises an oval shape, the oval shape fusion cage body has a length direction and a width direction, and one side of the length direction of the oval shape is the back side thereof; the front side and the rear side of the annular fusion cage body are matched with a hard annular structure vertebral body in a human body.

In an embodiment of the invention, the beating part is a stepped protrusion.

In an embodiment of the present invention, the stepped protrusion includes a first protrusion and a second protrusion; in the annular direction, the step directions of the first bulges are distributed along the anticlockwise direction, and the step directions of the second bulges are distributed along the clockwise direction.

In an embodiment of the invention, the opening is formed at a connection position of a groove wall of the groove and the rear side of the fusion cage body, and the opening is distributed along the annular direction of the fusion cage body.

In an embodiment of the invention, the rim of the opening includes a portion of the rear sidewall of the cage body, and the notch is disposed on the rear sidewall of the cage body; the breach is equipped with two, one of them breach is located the rear end of the rear side of fusing the ware body, another the breach is located the side of the rear side of fusing the ware body.

In an embodiment of the invention, the slot edges at two sides of the notch are provided with blocking blocks protruding towards the interior of the fusion device body.

In an embodiment of the invention, the upper surface and the lower surface of the fusion cage are provided with step-shaped insections, and the step direction of the insections extends from the rear side to the front side.

In an embodiment of the invention, the posterior lumbar fusion cage assembly further comprises a beater provided with a stepped support surface matching the stepped protrusion.

In one embodiment of the present invention, the posterior lumbar fusion cage assembly further comprises an extractor comprising a "T" shaped portion that mates with the notch.

In one embodiment of the invention, the slot edges at two sides of the notch are provided with blocking blocks protruding towards the interior of the fusion device body; when the T-shaped part extends into the notch, the T-shaped part is limited between the stop block and the hole edge of the opening.

The invention has the advantages that: the structure of the fusion device body, particularly the front side and the rear side of the fusion device body are designed in a matching way according to individualized anatomical parameters of epiphyseal rings of different patients, and the fusion device body is matched with epiphyseal ring curves to play a role in stable support and stress dispersion. The cage body can be implanted at a transforaminal approach, but adjusted laterally and obliquely, eventually reaching the pre-operatively designed epiphyseal ring support position.

Designing an operation area, namely a beating part in the groove, wherein the beating part is in a step design in two directions, and one step is matched with the beater on the side surface and beats towards the side; the other is a ladder matched with the knocker on the tail end, and the ladder is knocked forwards, so that the fusion device body can be implanted conveniently. Meanwhile, the beating part is matched, and the beating device is also provided with an adaptive ladder, so that the phenomena of slipping and the like during beating are prevented, displacement is generated, and the implantation effect is influenced. An opening and a notch are arranged for the ejector to be inserted. After the extractor is inserted, the extractor moves to the side and passes through an area with the thickened and raised inner part to reach the sliding rail area, and the extractor can be knocked to withdraw from the intervertebral container. The head of the extractor is a T-shaped part, and the extractor is uniformly stressed to extract. The contact part of the T-shaped head of the ejector and the fusion device and the contacted part of the fusion device are all provided with insections, so that friction is increased.

Drawings

The invention is further explained below with reference to the figures and examples.

Fig. 1 is a structural view of a fusion cage body according to an embodiment of the present invention.

Fig. 2 is a structural diagram of a rapper according to an embodiment of the present invention.

Fig. 3 is a structural diagram of an ejector according to an embodiment of the present invention.

Wherein the content of the first and second substances,

1 a fusion cage body;

11 a handle aperture; 12, grooves;

13 insection; 14 a beating part;

15, opening holes; 16 gaps;

141 a first projection; 142 a second projection;

161 blocking block;

2, a knocker; 21 knocking the end head;

22 knocking the rod body; 211 a support surface;

3, an extractor;

31 withdrawing the rod; a 32 "T" shaped portion.

Detailed Description

The following description of the embodiments refers to the accompanying drawings for illustrating the specific embodiments in which the invention may be practiced. The directional terms used in the present invention, such as "up", "down", "front", "back", "left", "right", "top", "bottom", etc., refer to the directions of the attached drawings. Accordingly, the directional terms used are used for explanation and understanding of the present invention, and are not used for limiting the present invention.

Example (b): as shown in fig. 1 to 3, a posterior lumbar fusion cage assembly includes a cage body 1, a knocker 2, and an extractor 3.

Fuse ware body 1 can be printed with 3D printing technique and form. The printing material is made of medical materials, such as medical resin and the like. Generally, the fusion cage body 1 is ring-shaped, including circular, oval or other ring-shaped opposite. In this embodiment, the fusion cage body 1 is designed to have an elliptical shape. The oval-shaped fusion cage body 1 has a length direction and a width direction.

The fusion cage body 1 is customized or 3D printed, the main reason and the purpose are that different patients are different in anatomical dimension, the traditional posterior approach is implanted, the fusion cage body is located in the middle of the vertebral body, the fusion cage body 1 is easy to sink, but each vertebral body has a harder annular structure around, if the two ends of the fusion cage body 1 can be matched and supported at the position of the harder annular structure around the vertebral body, the fusion cage is better supported and not easy to sink, therefore, the fusion cage is designed in size according to the target position, and the two ends of the annular arc and the annular structure of the vertebral body are matched in anatomical mode. Thus, the cage body 1 includes a side surface and upper and lower surfaces in a ring shape. Wherein the striking place where the fusion device body 1 is implanted is a rear side, a side opposite to the rear side is a front side, and connected between the front side and the rear side are a left side and a right side. I.e. in the front-to-back direction, i.e. in the longitudinal direction of the cage body 1. In the embodiment, the arc structures at the two ends of the fusion cage body are anatomically matched with the harder annular structure around the vertebral body. This is also an important reason why this kind of fuser needs to be customized or 3D printed for production. Therefore, in order to fit the hard vertebral body of the ring structure in the human body, the front and rear side portions of the ring-shaped fusion cage body are ring-shaped.

As shown in fig. 1, the fusion cage body 1 has a holding hole 11, a groove 12, a serration 13, a striking portion 14, an opening 15, and a notch 16.

The holding hole 11 is a circular threaded hole for a holder. The specific position of the holding hole 11 is in the middle of the rear side.

The groove 12 is provided on the rear side of the fusion device body 1, and in practice, the groove 12 is located so as to extend forward in a circular direction from the rear side adjacent to the grip hole 11 to the position where the left side meets the rear side.

The beating part 14 is arranged at the bottom of the groove 12; the beating part 14 is actually a stepped projection, and the stepped projection comprises a first projection 141 and a second projection 142; in the annular direction, the step directions of the first protrusions 141 are distributed in a counterclockwise direction, and the step directions of the second protrusions 142 are distributed in a clockwise direction. The first projection 141 is provided near the left side of the fusion cage body 1 and is used for a portion where the striker strikes the fusion cage body 1 to the side, and the second projection 142 is provided near the grip hole 11 and is used for a portion where the striker 2 strikes the fusion cage body 1 to the front.

The opening 15 is arranged at the rear side of the fusion cage body 1; in this embodiment, the opening 15 is disposed at a connection between a groove wall of the groove 12 and a rear side of the fusion cage body 1, and the opening 15 is distributed along a circular direction of the fusion cage body 1.

The notch 16 is provided on the edge of the opening 15. The edge of the opening 15 includes a part of the rear side wall of the fusion cage body 1, the notch 16 is provided on the rear side wall of the fusion cage body 1, and in fact, the notch of the notch 16 is disposed upward. In this embodiment, there are two notches 16, one of the notches 16 is located at the rear end of the rear side of the fusion cage body 1, and the other notch 16 is located at the side edge of the rear side of the fusion cage body. And blocking blocks 161 protruding towards the interior of the fusion cage body 1 are arranged on the groove edges at the two sides of the notch 16.

The insection 13 is in a step shape, is distributed on the upper surface and the lower surface, and has the function of further increasing the support and the friction force between the fusion cage body 1 and the lumbar intervertebral space. The insection 13 has a stepped direction extending from the rear side to the front side, so as to reduce friction during implantation and avoid damage to the lumbar spine.

As shown in fig. 2, the rapping device 2 includes a rapping bar body 22 with a rapping end 21 connected to the rapping end 21, and one end of the rapping bar body 22 is provided with a step-shaped supporting surface 221 matching with the step-shaped protrusion, so as to prevent slipping and the like during rapping. The rapping device 2 may also be printed using 3D printing technology. The printing material is made of medical materials, such as medical resin and the like, and can be made of metal materials.

As shown in fig. 3, the ejector 3 includes an ejector rod 31 and a T-shaped portion 32 connected to the ejector rod 31 for real-time insertion and ejection into and out of the notch 16, and the T-shaped portion 32 is inserted into the opening 15 and engaged with the notch 16 to eject the fusion cage body 1. The ejector 3 can also be printed by 3D printing technology. The printing material is made of medical materials, such as medical resin and the like, and can be made of metal materials. The T-shaped portion 32 of the ejector 3 and the contact portion of the cage and the contacted portion of the cage are indented to increase friction. The T-shaped portion 32 can be withdrawn from the fusion cage body 1 after being nested. In addition, the insertion of the "T" shaped portion 32 is performed through the notch 16, and the notch 16 is provided with two notches, wherein one notch 16 is located at the rear end of the rear side of the fusion cage body, and the other notch 16 is located at the side of the rear side of the fusion cage body 1. This is for convenience as the "T" may be inserted when the cage is in different positions. For example: the fusion cage body 1 is inserted through the lateral notch 16 when it is not tilted, and inserted through the rear notch 16 if it is tilted.

When the "T" shaped portion 32 extends into the notch 16, the "T" shaped portion is confined between the stop 161 and the rim of the opening 15. The stopper 16 is used for inserting the T-shaped part 32 deeper and then moving into the space of the opening 15, and the T-shaped part 32 is stopped and limited by the stopper 161 and does not slide out of the notch 16 and automatically exits.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A posterior lumbar fusion cage assembly, which is characterized by comprising a fusion cage body, a knocker and an extractor; the fusion cage body is provided with

The holding hole is arranged in the middle of the rear side of the fusion cage body;

the groove is arranged on the rear side of the fusion cage body;

the knocking part is arranged at the bottom of the groove; the beating part is a step-shaped bulge;

the opening is formed in the rear side of the fusion cage body; the opening is formed in the connecting position of the groove wall of the groove and the rear side of the fusion cage body;

the notch is arranged on the hole edge of the opening; the slot edges at the two sides of the notch are provided with blocking blocks protruding towards the interior of the fusion device body;

the rapping device is provided with a step-shaped supporting surface matched with the step-shaped bulge;

the ejector comprises a T-shaped part which is used for extending into and ejecting out of the notch in real time; when the T-shaped part extends into the notch, the T-shaped part is limited between the stop block and the hole edge of the opening.

2. The posterior lumbar cage assembly of claim 1 wherein said cage body is a 3D printed annular cage body comprising an oval shape, said oval shaped cage body having a length direction and a width direction, one side of the length direction of said oval shape being its posterior side; the front side and the rear side of the annular fusion cage body are matched with a hard annular structure vertebral body in a human body.

3. The posterior lumbar cage assembly of claim 1 wherein said stepped projection comprises a first projection and a second projection; in the annular direction, the step directions of the first bulges are distributed along the anticlockwise direction, and the step directions of the second bulges are distributed along the clockwise direction.

4. The posterior lumbar cage assembly of claim 1 wherein said openings are formed at the junction of the wall of said recess and the posterior side of said cage body and are distributed along the circumference of said cage body.

5. The posterior lumbar cage assembly of claim 4 wherein said aperture rim of said aperture comprises a portion of a posterior side wall of said cage body, said notch being provided on said posterior side wall of said cage body; the breach is equipped with two, one of them breach is located the rear end of the rear side of fusing the ware body, another the breach is located the side of the rear side of fusing the ware body.

6. The posterior lumbar cage assembly of claim 2 wherein said cage has stepped insections on both upper and lower sides, said insections having a stepped orientation extending from a posterior side to an anterior side.