CN106037906B - A kind of rotatable lumbar vertebrae elastic fixing device - Google Patents

Abstract

A rotatable lumbar elastic fixation device relates to the fields of rehabilitation engineering and medical equipment. It is characterized in that: the lumbar elastic fixation device comprises at least two U-shaped implants arranged in series and at least two rivets; wherein at least two round holes are processed on the plane of one U-shaped implant, and the two rivets are One end is fixedly connected in these two round holes; the other U-shaped implant plane is processed with at least one round hole and an arc-shaped groove, and the round hole is used to fix the other end of a rivet to form a fixed connection , and the arc-shaped groove is used to form a movable connection with another rivet; the rivet forming a fixed connection is used as a fixed central axis, and the rivet forming a movable connection can rotate around the fixed central axis and along the arc-shaped groove. The present invention improves the U-shaped structure, adopts the M-shaped structure and the S-shaped structure, and adds hinge kinematic pairs, which greatly improves the rotational activity of the lumbar spine; and can realize the interspinous process connection of one or more segments.

Description

A rotatable elastic fixation device for lumbar spine

technical field

The invention relates to the field of rehabilitation engineering and medical equipment, in particular to a rotatable lumbar elastic fixation device.

Background technique

Degenerative disc disease (DDD) is one of the most common diseases in lumbar surgery. It refers to the physiological and pathological process of natural aging and degeneration of the lumbar spine. Since entering the information age, with the changes in people's lifestyles, the prevalence of lumbar degenerative diseases has continued unabated, which has seriously affected the work and life of middle-aged and elderly people. The lumbar intervertebral disc bears the weight of the human trunk and upper limbs, and its strain is more serious than other tissues. Moreover, the lumbar intervertebral disc has less blood supply and extremely limited nutrition, so it is easy to degenerate.

Degenerative diseases of the lumbar spine require surgical treatment when conservative treatment fails. The purpose and principle of the operation is to relieve the compression of the nerves and restore the stability and motor function of the lumbar spine on the premise of protecting the normal lumbar load-bearing, movement and nerve function as much as possible. The main surgical methods are decompression, fusion and internal fixation. The main purpose of treatment is to relieve the factors that cause symptoms, relieve the compression on the nerve roots, and maintain the stability of the spine. Due to the high fusion rate of intervertebral fusion, it is considered clinically the "gold standard" for the treatment of this disease.

With the continuous deepening of research on the physiological function and biomechanics of the lumbar spine, a large number of studies have shown that although the success rate of radiographic fusion after fusion is as high as 95%, the satisfaction rate of clinical results is only about 70%. At the same time, doctors found that after lumbar fusion, the loss of motion function of the fusion segment led to abnormal changes in intervertebral stress conduction and redistribution of the range of motion of each segment, resulting in a significant increase in the range of motion of adjacent segments, and degenerative diseases of adjacent segments gradually became The main complication of fusion surgery has an incidence rate as high as 52.5%, while the formation of pseudarthrosis is a common complication in the late stage of fusion surgery, and its incidence rate ranges from 2% to 69%.

In order to avoid the occurrence of the above-mentioned complications, as well as further understanding of the pathophysiology of spinal instability and the mechanism of pain, the concept of non-fusion lumbar stabilization reconstruction has gradually been recognized and accepted. "Dynamic stabilization" is placed between the spinous processes in a pre-compressed state, further stretched when the lumbar spine is flexed, and acts as an elastic buffer between the spinous processes. For a stabilization system that preserves beneficial motion and load transfer between segments. Preserve part of its motor function and limit abnormal activities between segments, eliminate abnormal stress conduction, avoid compensation of adjacent segments, and theoretically achieve the purpose of not only solving the problem of diseased segments but also preventing the occurrence of adjacent segment degeneration .

The representative one is the Coflex system, which is a titanium alloy device with elastic dynamic fixation, consisting of a "U"-shaped interspinous spacer and 4 side wings. Biomechanical studies have confirmed that when the distance between the U-shaped tip of Coflex and the dura mater is ≤5mm, it can restore some unstable specimens to the complete specimen state in the directions of flexion, extension, and axial rotation, but not in the direction of left and right lateral bending. Restoring the stability of some unstable specimens; but when the distance ≥ 10mm, the stability of some unstable specimens cannot be restored in 6 directions. The U-shaped elastic internal fixator limits the rotational freedom of the lumbar spine, so it has a greater impact on the rotational mobility of the lumbar spine.

The present invention improves the U-shaped structure, adopts the M-shaped structure and the S-shaped structure, and adds a hinge kinematic pair, which greatly improves the rotational activity of the lumbar spine; and the present invention can realize the interspinous process connection of one or more segments .

Contents of the invention

A rotatable elastic fixation device for the lumbar spine, the elastic fixation device for the lumbar spine includes two U-shaped implants and two rivets.

In order to achieve the above object, the present invention provides technical scheme:

A rotatable elastic fixation device for the lumbar spine, characterized in that the elastic fixation device for the lumbar spine includes at least two U-shaped implants arranged in series and at least two rivets; wherein one U-shaped implant is processed with at least two round holes, and one end of two rivets is fixedly connected in these two round holes; another U-shaped implant plane is processed with at least one round hole and an arc-shaped groove; the round hole is used for fixing The other end of one rivet forms a fixed connection, and the arc-shaped groove is used to form a movable connection with the other rivet; the rivet forming a fixed connection is used as a fixed central axis, and the rivet forming a flexible connection can be around the fixed central axis, along the Arc groove rotation.

According to the different assembling directions of the arc grooves when the two U-shaped implants are connected by two rivets, the two U-shaped implants form an M-shaped or S-shaped lumbar spine elastic fixation device.

M-type and S-type lumbar elastic fixation devices realize the interspinous process connection of one or more segments.

The two U-shaped implants employed in the present invention are similarly extended to serial connections of multiple U-shaped implants to accommodate different spinal distances. In this way, the present invention can not only be used for the elastic internal fixation of the lumbar spine, but also can be used for the elastic internal fixation of other parts of the spine.

It can be seen from the above-mentioned technical scheme that the present invention designs two U-shaped lumbar implants and two rivet connections; the two U-shaped lumbar implants are assembled in series, which can ensure that the lumbar spine has greater longitudinal elasticity; A U-shaped implant can rotate around the rivet at a small angle, which can ensure a certain degree of freedom for the lumbar spine to rotate.

Description of drawings

Fig. 1a is a schematic diagram of an M-shaped assembly structure of a rotatable lumbar elastic fixation device.

Fig. 1b is an exploded view of an M-shaped assembly structure of a rotatable lumbar elastic fixation device.

Fig. 2a is a schematic diagram of an S-shaped assembly structure of a rotatable lumbar elastic fixation device.

Fig. 2b is an exploded view of an S-shaped assembly structure of a rotatable lumbar elastic fixation device.

Detailed ways

To more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the accompanying drawings that need to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, these drawings are only the records of the application of the present invention. A specific embodiment of a rotatable lumbar elastic fixation device. The present invention includes but not limited to the following.

A rotatable lumbar elastic fixation device: the main body of the device is a first U-shaped implant 1, a second U-shaped implant 2, a first U-shaped implant 1, and a second U-shaped implant 2 Arranged in series and connected together by the first rivet 3 and the second rivet 4 .

Two round holes are processed on the side of the first U-shaped implant 1 , and one end of the first rivet 3 and the second rivet 4 are fixedly connected to the two round holes on the side of the first U-shaped implant 1 . A round hole and an arc groove 5 are processed on the side of the second U-shaped implant 2, and the round hole on the side of the second U-shaped implant 2 is used to fix the other end of the first rivet 3, and the arc groove 5 is used to form a movable connection structure with the second rivet 4 .

The tandem arrangement form of the lumbar elastic fixation device is divided into M according to the different assembly directions of the first U-shaped implant 1, the second U-shaped implant 2 and the arc groove 5 when the first rivet 3 and the second rivet 4 are connected. structure and S-shaped structure, the U-shaped openings of the first U-shaped implant 1 and the second U-shaped implant 2 are arranged in parallel to form an M-shaped structure, the first U-shaped implant 1 and the second U-shaped implant The U-shaped mouth of the object 2 is symmetrically arranged to form an S-shaped structure.

The fixedly connected first rivet 3 acts as a fixed central axis, while the movable connected second rivet 4 can rotate around the fixed central axis and along the arc-shaped groove. In this way, the relative rotation of the first U-shaped implant 1 and the second U-shaped implant 2 in a small angle is realized.

In order to further understand the present invention, preferred solutions of the present invention will be described below in conjunction with examples. These descriptions only illustrate the features and advantages of the present invention, but do not limit the protection scope of the present invention.

The invention provides a rotatable lumbar replacement device. The lumbar elastic fixation device includes two U-shaped implants and two rivets.

As shown in FIG. 1 , the lumbar elastic fixation device arranges two U-shaped implants in series with the same opening direction, connects them together with two rivets, and assembles them into an M-shaped assembly structure. Two round holes are processed on the planes of the two U-shaped implants, and one ends of the two rivets are fixedly connected in the two round holes. Another U-shaped implant plane is processed with a circular hole and an arc-shaped groove; wherein the circular hole is used to fix the other end of a rivet, and the arc-shaped groove is used to form a flexible connection with another rivet.

As shown in FIG. 2 , in the lumbar elastic fixation device, two U-shaped implants are arranged in series in the form of opposite opening directions, connected together by two rivets, and assembled into an S-shaped assembly structure. One of the U-shaped implant planes is processed with two circular holes, and one ends of two rivets are fixedly connected in the two circular holes. Another U-shaped implant plane is processed with a circular hole and an arc-shaped groove; wherein the circular hole is used to fix the other end of a rivet, and the arc-shaped groove is used to form a flexible connection with another rivet.

The outermost two ends of the lumbar elastic fixation device are respectively connected with the upper and lower lumbar vertebral bodies. In this way, the lumbar elastic fixation device is integrally implanted between the lumbar vertebrae of the patient.

The rivet forming a fixed connection is used as a fixed central axis, while the rivet forming a movable connection can rotate around the fixed central axis and along the arc groove. In this way, the relative rotation of the two U-shaped implants can be realized in a small angle.

It can be seen from the above-mentioned technical scheme that the present invention designs two U-shaped lumbar implants and two rivet connections; the two U-shaped lumbar implants are assembled in series, which can ensure that the lumbar spine has greater longitudinal elasticity; A U-shaped implant can rotate around the rivet at a small angle, which can ensure a certain degree of freedom for the lumbar spine to rotate.

The invention relates to a rotatable lumbar elastic fixation device, which is suitable for the fields of rehabilitation engineering and medical equipment.

Each embodiment in this specification is described in a selective manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

Claims (2)

1. A rotatable elastic fixation device for the lumbar spine, characterized in that: the elastic fixation device for the lumbar spine comprises at least two U-shaped implants arranged in series and at least two rivets; two round holes, and one end of two rivets is fixedly connected in these two round holes; another U-shaped implant plane is processed with at least one round hole and an arc-shaped groove; the round hole is used for The other end of one rivet is fixed to form a fixed connection, and the arc-shaped groove is used to form a movable connection with another rivet; the rivet forming a fixed connection is used as a fixed central axis, and the rivet forming a movable connection can be around the fixed central axis, Rotate along the arc groove. 2. The rotatable lumbar spine elastic fixation device as claimed in claim 1, characterized in that: according to two U-shaped implants connected by two rivets, the assembly directions of the arc grooves are different, and the two U-shaped implants An M-type or S-type elastic fixation device for the lumbar spine is formed.