CN209048367U - Oblique lateral approach lumbar intervertebral merges fixed device - Google Patents

Abstract

The utility model discloses an oblique lateral approach lumbar intervertebral fusion and fixation device, which comprises a cage body, a fixing seat and a locking screw connected with the tail end of the cage body; the front end of the cage body is a convex arc shape The upper surface and the lower surface of the cage body are both configured as arc-shaped surfaces that are compatible with the height of the intervertebral body and have a sawtooth structure, and the surface of the cage is provided with a cavity for accommodating bone particles. The left and right side walls of the body are provided with side holes communicating with the cavity; the fixed seat is provided with oblique threaded holes symmetrically on the left and right, and the angle between the axis line of the oblique threaded hole and the horizontal plane ranges from 10° to 30°, and the oblique threaded holes To mate with the locking screw thread. The oblique lateral approach lumbar intervertebral fusion fixation device can conveniently realize the fixation of the cage and effectively prevent the cage from being displaced.

Description

Oblique lateral approach lumbar interbody fusion fixation device

technical field

The utility model relates to the technical field of medical devices, in particular to an oblique lateral approach lumbar intervertebral fusion and fixation device.

Background technique

Lumbar interbody fusion is widely used in degenerative lumbar disc diseases, such as lumbar disc herniation, lumbar spinal stenosis, lumbar spondylolisthesis, and lumbar degenerative scoliosis. In recent years, with the development of minimally invasive surgical techniques, interbody fusion and fixation through minimally invasive channels has become more and more popular, including frontal and lateral interbody fusion (DLIF) and oblique lateral interbody fusion ( OLIF), because the oblique lateral approach interbody fusion (OLIF) has the advantages of less surgical trauma, simple operation, fewer complications, and larger bone graft volume than other traditional methods, so it is widely used. Oblique lateral interbody fusion (OLIF) requires the use of a cage to promote the growth and fusion of the bone tissue between the patient's vertebral bodies to restore the mechanical stability of the vertebral body. For some patients with severe lumbar instability, only the interbody fusion is placed in the patient Due to the poor anti-rotation mechanical properties of the cage, the cage is prone to displacement, and it is often necessary to use it with a nail rod or nail plate that acts as a fixation. However, the use of nail plate or nail rod assisted fixation is difficult to locate, and the operation is cumbersome. The lumbar nerve often crosses the surface of the implant, which will stimulate the lumbar nerve and cause nerve damage. Moreover, the fixation effect of this method is still not ideal, and it is still clinically used. Cage displacement can be observed in patients with combined use of the nail rod or nail plate system.

Utility model content

In order to solve the above problems, the purpose of the present invention is to provide an oblique lateral approach lumbar intervertebral fusion and fixation device, which can conveniently realize the fixation of the cage and effectively prevent the cage from being displaced.

Based on this, the present utility model provides an oblique lateral approach lumbar intervertebral fusion and fixation device, comprising a cage body, a fixing seat and a locking screw connected to the tail end of the cage body; the front end of the cage body It is a convex arc surface, the upper surface and the lower surface of the cage body are configured as arc surfaces that are compatible with the height of the intervertebral body and have a sawtooth structure, and the surface is provided with up and down through holes for accommodating. The cavity of the bone particles, the left and right side walls of the cage body are provided with side holes communicating with the cavity; the fixed seat is symmetrically provided with oblique threaded holes, and the axis of the oblique threaded holes is in line with the The included angle of the horizontal plane ranges from 10° to 30°, and the oblique threaded hole is threadedly matched with the locking screw.

As a preferred solution, the sawtooth structure is a triangular positioning tooth continuously arranged from front to back on the arc surface.

As a preferred solution, the fixing seat includes a mounting portion and a connecting portion, the oblique threaded hole is opened in the mounting portion, and the connecting portion is sleeved on the rear end of the cage body and fits tightly.

As a preferred solution, the locking screw includes a nail cap, a nail body and a nail tail, the outer circumference of the top cap is a spherical surface, the center of the nail cap is provided with a locking groove, and the surface of the nail body is provided with a tapered thread, so The nail tail is provided with a cutting edge.

As a preferred solution, the locking slot is configured as a hexagonal slot, a cross slot, a rectangular slot or a straight slot.

As a preferred solution, the oblique lateral approach lumbar intervertebral fusion and fixation device further includes an elastic limit pin disposed on the oblique threaded hole for preventing the locking screw from coming out.

As a preferred solution, the cage body is made of PEEK material, and the locking screw is made of titanium alloy material.

As a preferred solution, both ends and the middle of the cage body are provided with developing holes.

As a preferred solution, the fixing base is provided with two oblique threaded holes symmetrically on the left and right sides; the included angle between the axis line of the oblique threaded hole and the horizontal plane is 10°.

Compared with the prior art, the beneficial effects of the present utility model are:

The oblique lateral approach lumbar intervertebral fusion and fixation device of the utility model can use a minimally invasive channel to insert the patient's lumbar intervertebral space from the oblique outer side, and the fusion and fixation device fixed with locking screws can be placed together with the cage body and the fixing seat. It can simplify the operation steps, reduce the difficulty of the operation, and the locking screw is firmly fixed, which can effectively prevent the displacement of the cage body.

Description of drawings

1 is a schematic three-dimensional structural diagram of an oblique lateral approach lumbar intervertebral fusion and fixation device provided by an embodiment of the present invention;

2 is a side view of an oblique lateral approach lumbar intervertebral fusion and fixation device provided by an embodiment of the present invention;

FIG. 3 is a longitudinal cross-sectional view of FIG. 1 .

Among them, 1. cage body; 11. cavity; 12. side hole; 13. triangular positioning tooth; 14. developing hole; 2. fixing seat; 21. mounting part; 211. oblique threaded hole; 3, locking screw; 31, nail cap; 311, locking groove; 32, nail body; 33, nail tail; 4, elastic limit pin.

Detailed ways

The specific embodiments of the present utility model will be described in further detail below with reference to the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical" and "horizontal" , "top", "bottom", "inside", "outside" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, only for the convenience of describing the present utility model and simplifying the description, rather than indicating or It is implied that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as a limitation of the present invention.

Please refer to FIG. 1 to FIG. 3 , which schematically shows the oblique lateral approach lumbar intervertebral fusion and fixation device (OLIF fusion and fixation device) of the present invention, including a cage body 1 , and a tail end of the cage body 1 . Attached mount 2 and locking screw 3.

Wherein, the cage body 1 is preferably made of high molecular polymer polyetheretherketone (PEEK, Polytheretherketone) material, which conforms to the biomechanical characteristics of the human body and has good tissue compatibility. The front end of the cage body 1 is convex. The curved surface of the cage can facilitate the implantation of the main body of the cage into the lumbar intervertebral space of the patient to reduce resistance. Both the upper surface and the lower surface of the cage body 1 are configured as arc-shaped surfaces that match the height of the intervertebral body and have a sawtooth structure, which can increase the friction force of the contact surface, thereby preventing the cage body from withdrawing into the rear spinal canal, Avoid compressing the nerve root or cauda equina to reduce the risk of a second surgery for the patient. The surface of the cage body 1 is provided with a cavity 11 that runs through the upper and lower sides for accommodating bone particles. The left and right side walls of the cage body 1 are provided with side holes 12 that communicate with the cavity 11. The cavity of the cage body 1 is provided with side holes 12. 11 Filling with autologous bone, while ensuring sufficient strength, the maximum bone graft capacity can be achieved as much as possible, and at the same time, it is convenient for the surrounding bone to grow in, so as to promote the bone fusion rate. More importantly, the fixing base 2 is provided with an oblique threaded hole 211 symmetrically on the left and right sides. The angle between the axis line of the oblique threaded hole 211 and the horizontal plane ranges from 10° to 30°. The oblique threaded hole 211 is threaded with the locking screw 3 . , the locking screw 3 is preferably made of titanium alloy material.

The minimally invasive channel is used to place the fusion fixation device into the lumbar intervertebral space of the patient from the oblique outer side. During use, the fixation seat 2 is implanted together with the cage body 1, and the cage body 1 and the nail plate do not need to be implanted separately, which can simplify the operation steps. , reduce the difficulty of the operation, and then use the locking screw 3 to fix the cage body 1, and use the locking screw 3 to fix the cage to the vertebral body, which improves the fixation effect and can effectively prevent the cage body 1 from being displaced. In addition, after the device is implanted, it can be completely submerged into the vertebral body, completely avoiding the stimulation of human organs by the nail plate or the nail rod, reducing the trauma of the patient and speeding up the later recovery.

Specifically, the sawtooth structure on the upper and lower surfaces of the cage body 1 is a continuous arrangement of triangular positioning teeth 13 from front to back. Effectively prevent the cage body 1 from slipping.

On the basis of the above structure, the fixing seat 2 in the above embodiment includes a mounting portion 21 and a connecting portion 22, the oblique threaded hole 211 is opened in the mounting portion 21, and the connecting portion 22 is sleeved on the rear end of the cage body 1 and is tightly closed In order to facilitate the implantation of the fixed seat 2 together with the cage body 1 into the lumbar intervertebral space. The connecting portion 22 is preferably an annular structure, and the annular structure is tightly fitted to the rear end of the cage body 1 . Of course, the connecting portion 22 can also be a non-closed structure with a notch, as long as the fixing base 2 and the cage body 1 can be connected synchronously in the front-rear direction.

More specifically, the locking screw 3 includes a nail cap 31, a nail body 32 and a nail tail 33, the outer circumference of the top cap is spherical, the surface of the nail body 32 is provided with tapered threads, and the nail tail 33 is provided with a cutting edge. The locking screw 3 is screwed into the fixing seat 2 through the locking groove 311 provided in the center of the screw cap 31, and screwed into the two vertebral bodies on the upper and lower sides of the cage body 1 through the cutting edge of the screw tail 33 and the tapered thread to realize the oblique Fixation of lateral lumbar interbody fusion fixation device. In this embodiment, the locking slot 311 is preferably configured as a hexagonal slot, a cross slot, a rectangular slot or a straight slot. Preferably, in this embodiment, the diameter of the nail body 32 of the locking screw 3 is set to 6.5 mm, the length is set to 50 mm, and the thread pitch is set to 3.8 mm.

As a preferred embodiment, as shown in FIG. 2 , the oblique lateral approach lumbar interbody fusion and fixation device further includes an elastic limit pin 4 disposed on the oblique threaded hole 211 , and the elastic limit pin 4 is used to prevent the screw 3 from being locked. come out. When the locking screw 3 is screwed into the fixing seat 2 until it reaches the nail cap 31, the elastic limit pin 4 is squeezed out of position, and resets after the locking screw 3 is fully screwed in, so that it can be stuck on the nail cap 31. In order to prevent the locking screw 3 from protruding, the stability of the lumbar interbody fusion and fixation device of the oblique lateral approach is further improved.

Preferably, in order to facilitate positioning during surgery, both ends and the middle of the cage body 1 are provided with developing holes 14, and a developing wire is placed in the developing hole 14. The developing wire can be titanium wire or tantalum wire, and the developing wire can be in the Developed under X-ray to achieve positioning.

Further preferably, the fixing base 2 is provided with two oblique threaded holes 211 symmetrically on the left and right sides to increase the locking force, and the angle between the axis line of the oblique threaded hole 211 and the horizontal plane is preferably set to 10°.

To sum up, the oblique lateral approach lumbar intervertebral fusion and fixation device provided by the present invention can be applied to the minimally invasive channel and inserted into the lumbar intervertebral space from the oblique lateral side. The main body and the fixed seat are placed together, which can simplify the operation steps, effectively prevent the displacement of the cage body, and has high application and promotion value.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the technical principles of the present invention, several improvements and replacements can be made. These improvements And replacement should also be regarded as the protection scope of the present invention.

Claims (9)

1. An oblique lateral approach lumbar intervertebral fusion fixation device is characterized in that, comprising a cage body, a fixing seat and a locking screw connected with the tail end of the cage body; the front end of the cage body is an external A convex arc surface, the upper surface and the lower surface of the cage body are configured as arc surfaces that are compatible with the height of the intervertebral body and have a sawtooth structure, and the surface is provided with up and down through holes for accommodating bone particles The cavity, the left and right side walls of the cage body are provided with side holes communicating with the cavity; The fixing base is provided with oblique threaded holes symmetrically from left to right, the angle between the axis line of the oblique threaded hole and the horizontal plane ranges from 10° to 30°, and the oblique threaded hole is threadedly matched with the locking screw. 2 . The oblique lateral approach lumbar interbody fusion and fixation device according to claim 1 , wherein the sawtooth structure is a triangular positioning tooth continuously arranged from front to back on the arc surface. 3 . 3 . The oblique lateral approach lumbar intervertebral fusion and fixation device according to claim 1 , wherein the fixing seat comprises an installation part and a connection part, the oblique threaded hole is opened in the installation part, and the connection part is 3. 4 . The part is sleeved on the rear end of the cage body and fits tightly. 4. The oblique lateral approach lumbar intervertebral fusion and fixation device according to claim 1, wherein the locking screw comprises a screw cap, a screw body and a screw tail, the outer periphery of the screw cap is a spherical surface, and the screw cap has a spherical surface. The center is provided with a locking groove, the surface of the nail body is provided with a tapered thread, and the nail tail is provided with a cutting edge. 5 . The oblique lateral approach lumbar interbody fusion and fixation device according to claim 4 , wherein the locking groove is configured as a hexagonal groove, a cross groove, a rectangular groove or a straight groove. 6 . 6. The oblique lateral approach lumbar intervertebral fusion and fixation device according to claim 1, wherein the oblique lateral approach lumbar intervertebral fusion and fixation device further comprises a screw hole provided on the oblique threaded hole for preventing The elastic limit pin from which the locking screw comes out. 7. The oblique lateral approach lumbar intervertebral fusion and fixation device according to any one of claims 1 to 6, wherein the cage body is made of polyetheretherketone material, and the locking screw is made of Made of titanium alloy material. 8 . The oblique lateral approach lumbar intervertebral fusion and fixation device according to claim 7 , wherein the two ends and the middle of the cage body are provided with developing holes. 9 . 9 . The oblique lateral approach lumbar intervertebral fusion and fixation device according to claim 7 , wherein the fixing seat is provided with two oblique threaded holes symmetrically from left to right; the axis of the oblique threaded holes is The angle with the horizontal plane is 10°.