CN104814816A - Self-stabilization type extreme lateral approach intervertebral fusion cage - Google Patents

Abstract

The invention discloses a self-stabilizing intervertebral fusion device with an extremely lateral approach, which comprises a fusion device body approximately in the shape of a cuboid. The fusion device body is composed of an adjustment end and an expansion part. The structure of the lower expansion body is characterized in that there is a holding hole in the middle of the adjustment end of the main body of the fuser, the upper wing and the lower wing are respectively provided at both ends of the adjustment end, and the upper wing and the lower wing are respectively provided with connecting holes. There is a universal ball lock sleeve inside, the inner wall of the lock sleeve is provided with threads, the locking nail passes through the lock sleeve and the connecting hole, and the end is provided with a locking thread connected with the inner wall thread of the lock sleeve. When in use, install the fuser main body Insert the locking ring into the intervertebral space of the human body, and then insert the locking nail through the locking ring into the upper and lower vertebral bodies, and adjust the universal ball lock sleeve to achieve the best position. This invention does not require additional lateral implantation of plate screws Or implant the screw rod from the posterior approach, which has the advantages of small incision, convenient operation, less trauma, and no need for secondary surgery.

Description

Self-stabilizing extreme lateral approach intervertebral fusion cage

technical field

The invention relates to the technical field of internal fixation devices for the human spine, in particular to a self-stabilizing extremely lateral approach intervertebral fusion device for vertebral body fusion.

Background technique

In recent years, anterior lumbar fusion has gradually increased, which is beneficial to reduce the incidence of pseudarthrosis and restore the normal sagittal sequence of the patient's spine, and is developing in the direction of minimal invasiveness. XLIF (extreme lateral interbodv fusion, XLIF) is a new minimally invasive lumbar interbody fusion technique that has appeared in recent years through the retroperitoneal space and psoas muscle to reach the lumbar spine. Compared with traditional anterior lumbar surgery, The advantage of this technique is that it does not go through the peritoneal cavity and does not need to separate the large blood vessels and nerve plexus, thus greatly reducing the occurrence of complications. Because the extreme lateral approach intervertebral fusion (XLIF) has small incision, small trauma, and postoperative pain It has been widely used in recent years due to the advantages of less time spent in hospital, short hospital stay, and fast recovery. Using this intervertebral fusion, an intervertebral fusion device can be implanted in the intervertebral space, which can effectively restore the height of the intervertebral space and the volume of the intervertebral foramen. It is beneficial to disperse the load-bearing stress and reduce the pressure on the bone graft.

At present, there are many types of fusion devices used in extreme lateral approach intervertebral fusion (XLIF). For example, CN 103876865 A discloses an intervertebral fusion device, which includes a fusion device body approximately in the shape of a cuboid and an expansion lock arranged inside the fusion device body. , Adjustment rod and lock cap threaded to the expansion lock. The main body of the fusion device is composed of an adjustment end and an expansion part. The expansion part is composed of an open upper expansion body and a lower expansion body. The opening end of the expansion part has an implantation end, the upper surface of the upper expansion body and the The lower surface has a load-bearing surface with anti-slip teeth matching the curvature of the human endplate, respectively, and the center of the upper and lower expansion bodies is respectively formed with bone graft holes corresponding to the upper and lower sides, and the two sides of the expansion part perpendicular to the load-bearing surface are respectively An arc-shaped adjustment groove is formed, and the inner diameter of the arc-shaped adjustment groove decreases in steps from the implant end to the adjustment end. The disadvantage of this intervertebral fusion device is that in order to maintain the stability of the fusion device, it is necessary to implant steel plates and screws in the lateral approach or to implant nail rods in the posterior approach, which inevitably prolongs the operation time or surgical trauma.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art, and provide a self-stabilizing ultralateral approach intervertebral fusion device with convenient assembly, simple operation and good use effect.

The technical solution adopted by the present invention to solve its technical problems is:

A self-stabilizing intervertebral fusion device with an extremely lateral approach, comprising a fusion device body approximately in the shape of a cuboid, the fusion device body is composed of an adjustment end and an expansion part, and the expansion part is composed of an opening-shaped upper expansion body and a lower expansion body , the opening end of the expansion part has an implanted end, the upper surface of the upper expansion body and the lower surface of the lower expansion body respectively have load-bearing surfaces with anti-slip teeth matching the curvature of the human endplate, and the upper and lower expansion bodies There are bone graft holes corresponding to the upper and lower sides in the center, and the two sides of the expansion part perpendicular to the load-bearing surface respectively form arc-shaped adjustment grooves. The inner diameter of the arc-shaped adjustment grooves decreases in steps from the implant end to the adjustment end. It is characterized in that there is a holding hole in the middle of the adjustment end of the main body of the fuser, the upper wing and the lower wing are respectively provided at both ends of the adjustment end, the upper wing and the lower wing are respectively provided with connection holes, and a universal joint is provided in the connection hole. Ball-type lock sleeve, the inner wall of the lock sleeve is provided with threads, and the locking nail passes through the lock sleeve and the connecting hole, and its end is provided with a locking thread connected with the inner wall thread of the lock sleeve.

In the present invention, an observation hole can be provided at the connecting end of the expansion part and the adjustment end, and a tantalum wire is provided in the observation hole, so as to observe the installation position of the present invention through perspective.

The end of the locking nail of the present invention is provided with a plum blossom holding hole to facilitate the operation of the locking nail.

When the present invention is used, the main body of the fusion device is put into the lock ring and implanted into the intervertebral space of the human body, and then the locking nail is inserted through the lock ring into the upper and lower vertebral bodies, and can be adjusted by the universal ball lock sleeve to achieve the best position, lock The nails and locking sleeves are locked by taper threads to prevent the locking nails from withdrawing, and complete vertebral body fusion and spinal fixation. The present invention does not require additional implantation of plate screws from the side or implantation of nail rods from the posterior, and has small notch, convenient operation, and more Less trauma, no need for secondary surgery and other advantages.

Description of drawings

Fig. 1 is a schematic diagram of the assembly structure of the present invention.

Fig. 2 is a schematic structural view of the fuser main body.

Fig. 3 is a schematic structural view of the locking nail.

Fig. 4 is a schematic diagram of the structure of the lock ring.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

A self-stabilizing intervertebral fusion device with an extremely lateral approach, comprising a fusion device body approximately in the shape of a cuboid. The fusion device body is composed of an adjustment end and an expansion part. The opening end of the expansion part has an implanted end, and the upper surface of the upper expansion body and the lower surface of the lower expansion body respectively have load-bearing surfaces with anti-slip teeth that match the curvature of the human endplate. The center of the body is respectively formed with bone graft holes corresponding to the upper and lower sides, and the two sides of the expansion part perpendicular to the load-bearing surface are respectively formed with arc-shaped adjustment grooves. Small, according to claim 1, a kind of self-stabilized intervertebral fusion device with extreme lateral approach, characterized in that the present invention is characterized in that there are 14 holding holes in the middle of the adjustment end of the main body of the fusion device, and the two ends of the adjustment end There are 11 upper wings and 12 lower wings on the ends respectively, connecting holes are respectively set on the 11 upper wings and 12 lower wings, the universal ball lock sleeve is arranged in the connection hole, the inner wall of the lock sleeve is provided with threads, and the 2 locking nails penetrate The end of the lock sleeve and the connecting hole is provided with 22 locking threads connected to the inner wall of the lock sleeve, and the end of the lock nail is provided with 21 torx holding holes to facilitate the operation of the 2 lock nails. In addition, the present invention An observation hole can be provided at the connecting end of the expansion part and the adjustment end, and 15 tantalum wires are arranged in the observation hole, so as to observe the installation position of the present invention through perspective.

Example 1:

A self-stabilizing ultra-lateral approach intervertebral fusion device, each set includes a fusion device body, two locking nails, and two locking rings. The fusion device body 1 includes upper wings 11, lower wings 12, and connecting holes 13 and 14. Hole, 15 tantalum wires, 16 teeth, 17 bone graft cavity (see Figure 2); locking screw 2 includes plum blossom holding hole 21, locking screw thread 22, bone thread 23 (see Figure 3); locking sleeve 3 includes locking thread 31 (see Figure 4), the main body of the fusion device 1 is inserted into the intervertebral space of the human body after being put into the locking ring; The ring is locked by taper thread to prevent the locking screw from withdrawing, and complete vertebral fusion and spinal fixation.

First put the 3-lock ring into the connection hole 13 of the 1 fusion device body, and the lock sleeve 3 fits into the connection hole; 17 implant autologous bone (allogeneic bone) or artificial bone in the bone graft cavity.

Then use the special tool-the fusion device holder to hold it through the 14 holding holes, and implant the main body of the fusion device into the intervertebral space. Among them, 11 upper wings are fitted with the upper vertebral body, 12 lower wings are fitted with the lower vertebral body, and 16 teeth are fitted with the upper and lower endplates of the vertebral body and embedded in the upper and lower endplates to prevent the main body of fusion cage 1 from coming out. Among them, the tooth surface is an arc structure, which can ensure a tight fit with the upper and lower end plates. The main function of the 15 tantalum wire is to develop under CT to ensure that the main body of the 1 fusion device is implanted in the best position.

Finally, the 2 locking screws are implanted into the upper and lower vertebral bodies through the 21 torx holding hole with a special screwdriver, and the bone thread 23 is held in the vertebral body; the locking thread 22 of the locking screw 2 is engaged with the 31 locking thread of the 3 locking ring to complete the intervertebral fusion final implantation of the device. Wherein the locking sleeve 3 can realize the universal swing in the universal hole at the upper end of the connecting hole 13, so as to ensure that the locking nail 2 is implanted in the best position.

Claims (3)

1. a self-stabilising Far lateral approach Invasive lumbar fusion device, comprise the fusion device main body of approximate rectangular shape, fusion device main body forms by regulating termination and bulge, bulge is made up of opening-like upper expander and lower expander, the opening of bulge has implantation termination, the upper surface of upper expander and the lower surface of lower expander have the weight-bearing surface being provided with anti-slop serrations matched with human body soleplate curvature respectively, on, the central authorities of lower expander are formed with bone grafting hole corresponding up and down respectively, two sides perpendicular to weight-bearing surface of bulge form arc regulating tank respectively, the internal diameter of arc regulating tank is from implantation termination to the adjustment stepped reduction in termination, it is characterized in that the centre, adjustment termination of fusion device main body is provided with to hold and get hole, two ends, termination are regulated to be respectively equipped with upper limb and bottom wing, upper limb and bottom wing are respectively equipped with connecting hole, universal ball lock tube is provided with in connecting hole, the inwall of lock tube is provided with screw thread, pinning is provided with through lock tube and its end of connecting hole the locking screw thread be connected with lock tube inner thread.

2. a kind of self-stabilising Far lateral approach Invasive lumbar fusion device according to claim 1, is characterized in that being provided with observation port at bulge with regulating termination link, being provided with tantalum wire in observation port.

3. a kind of self-stabilising Far lateral approach Invasive lumbar fusion device according to claim 1, is characterized in that pinning end is provided with Flos Mume and holds and get hole.