阅读说明：本技术 一种阻尼式人工椎间盘 (Damping type artificial intervertebral disc ) 是由 聂林 于 2020-07-29 设计创作，主要内容包括：本公开涉及一种阻尼式人工椎间盘,包括从上到下依次布置的上终板与下终板,所述上终板与下终板分别用于连接相邻的椎骨；上终板与下终板之间设置有弹性内核,所述弹性内核用于填充上终板与下终板之间的空间,所述弹性内核的上下两端分别与上终板、下终板贴合。所述上终板与下终板中分别设有一圈连接孔,所述弹性内核外部包覆设有纤维束,所述纤维束由弹性线编织形成,所述弹性线依次穿过上终板与下终板中的连接孔以完成编织。本公开能够解决现有人工椎间盘活动度过大或过低时,造成患者使用不适的问题,避免出现异位骨化或炎症。(The present disclosure relates to a damping type artificial intervertebral disc, which comprises an upper end plate and a lower end plate which are sequentially arranged from top to bottom, wherein the upper end plate and the lower end plate are respectively used for connecting adjacent vertebrae; an elastic inner core is arranged between the upper end plate and the lower end plate and used for filling the space between the upper end plate and the lower end plate, and the upper end and the lower end of the elastic inner core are respectively attached to the upper end plate and the lower end plate. The upper end plate and the lower end plate are respectively provided with a circle of connecting holes, the elastic inner core is coated with a fiber bundle, the fiber bundle is formed by weaving elastic wires, and the elastic wires sequentially penetrate through the connecting holes in the upper end plate and the lower end plate to complete weaving. The artificial intervertebral disc can solve the problem that the patient is uncomfortable to use when the activity of the existing artificial intervertebral disc is too large or too low, and ectopic ossification or inflammation is avoided.)

1. A damping type artificial intervertebral disc is characterized by comprising,

the upper end plate and the lower end plate are sequentially arranged from top to bottom and are respectively used for connecting adjacent vertebrae;

the elastic inner core is arranged between the upper end plate and the lower end plate and used for filling the space between the upper end plate and the lower end plate, and the upper end and the lower end of the elastic inner core are respectively attached to the upper end plate and the lower end plate;

the upper end plate and the lower end plate are respectively provided with at least one circle of connecting holes, the elastic inner core is coated with a fiber bundle, the fiber bundle is formed by weaving elastic wires, and the elastic wires sequentially penetrate through the connecting holes in the upper end plate and the lower end plate to complete weaving;

and the outer part of the fiber bundle is coated with an annular sleeve, and the upper end and the lower end of the annular sleeve are fixedly connected with the upper end plate and the lower end plate respectively.

2. The damped prosthetic disc of claim 1 wherein said upper and lower endplates have respective projections, the ends of said projections distal from the elastomeric core being of a tapered configuration.

3. The damped prosthetic intervertebral disc of claim 2, wherein the upper end surface of the upper endplate and the lower end surface of the lower endplate are respectively provided with annular grooves, and the annular grooves are uniformly distributed with the connecting holes.

4. The damped prosthetic disc of claim 3, wherein a cover plate is disposed in said annular groove for filling said annular groove.

5. The damped prosthetic disc of claim 2, wherein said elastic strands are obliquely braided to form said fiber bundles.

6. The damped prosthetic disc of claim 5, wherein said fiber bundles are of a multi-layer structure, the direction of inclination of the elastic strands in each layer of fiber bundles is the same, and the direction of inclination of the elastic strands in two adjacent layers of fiber bundles is different.

7. The damped disc prosthesis of claim 4, wherein the annular groove has a ring of alignment holes formed therein, and the annular sleeve has a ring of alignment blocks formed at upper and lower ends thereof, respectively, the alignment blocks extending into the alignment holes.

8. The damped disc prosthesis of claim 7 wherein said annulus is flexible and said locating blocks are configured to: under the condition of no pressure, the size of the positioning block is larger than that of the positioning hole so as to prevent the positioning block from retracting from the positioning hole.

9. The damped prosthetic disc of claim 7, wherein said pilot hole is disposed around the outside of the attachment hole.

10. The damped disc prosthesis of claim 1, wherein the elastic core is of a cylindrical structure, the upper end and the lower end of the elastic core are of arc-shaped convex structures, the lower surface of the upper endplate and the upper surface of the lower endplate are provided with arc-shaped grooves, and the arc-shaped grooves are fitted with the upper end surface and the lower end surface of the elastic core to realize the fitting.

Technical Field

The disclosure belongs to the technical field of medical equipment, and particularly relates to a damping type artificial intervertebral disc.

Background

The intervertebral disc is located between two vertebral bodies of the human vertebral column and is a sealing body consisting of a cartilage plate, a fibrous ring and nucleus pulposus. The cartilage plate is a hyaline cartilage covering the vertebral body. The upper and lower end plates, together with the annulus fibrosus, seal the nucleus pulposus. The annulus fibrosus is composed of fibrocartilage of collagen fiber bundles and is located around the nucleus pulposus. The fiber bundles of the fiber ring are mutually obliquely and crossly overlapped, so that the fiber ring becomes a solid tissue and can bear larger bending and torsion loads.

When the disc is damaged, the nucleus pulposus protrudes into the vertebral canal or intervertebral space, thereby compressing the spinal nerves and causing pain or paralysis in the relevant area. To alleviate this condition, a common method is to perform fusion, remove the cervical intervertebral disc, and implant a bone in the intervertebral space with a steel plate for internal fixation. Although this approach can restore the natural height of the intervertebral space, the mechanical environment within the spine changes, the motion function of the operative segment is lost, and the motion and pressure of the adjacent segments increases, possibly causing degenerative changes in the adjacent segments.

Another type of artificial intervertebral disc known to the inventor is a ball-groove type or ball-socket type connection structure, in which a relatively large range of free rotation can occur between a ball and a ball groove or a ball socket structure, and effective damping cannot be provided to realize spacing between adjacent vertebral bodies. The mobility of the artificial intervertebral disc is large, the bones and muscles around the intervertebral disc can generate compensation, ectopic ossification is generated at the intervertebral disc, the artificial intervertebral disc is completely locked, and the artificial intervertebral disc loses the corresponding motion function.

In another artificial intervertebral disc known to the inventor, a human-body-structure-simulated intervertebral disc is formed by a rigid metal plate, a fibrous ring and a flexible inner core, wherein the flexible inner core is fixedly connected with the rigid metal plate or the upper end of the flexible inner core is inserted into a groove of the rigid metal plate. When the muscle of a patient exerts force to realize the rotation of the intervertebral disc, the flexible inner core can rotate at a certain angle along with the rigid metal plate, the combined action of the flexible inner core and the fiber bundle needs to be considered when the mobility of the artificial intervertebral disc is set, the design is more complex, the mobility of the produced artificial intervertebral disc is possibly higher or lower, and the problems of ectopic ossification and the like are caused.

Meanwhile, the joint of the flexible inner core and the rigid metal plate is easy to wear, and generates debris, so that the service life of the whole device is influenced.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provide a damping type artificial intervertebral disc, which can solve the problem that the patient feels uncomfortable when the activity of the existing artificial intervertebral disc is too high or too low and avoid ectopic ossification.

To achieve the above objects, one or more embodiments of the present disclosure provide a damped prosthetic intervertebral disc, including an upper endplate and a lower endplate arranged in sequence from top to bottom, wherein the upper endplate and the lower endplate are respectively used for connecting adjacent vertebrae; an elastic inner core is arranged between the upper end plate and the lower end plate and used for filling the space between the upper end plate and the lower end plate, and the upper end and the lower end of the elastic inner core are respectively attached to the upper end plate and the lower end plate.

The upper end plate and the lower end plate are respectively provided with at least one circle of connecting holes, the elastic inner core is coated with fiber bundles, the fiber bundles are formed by weaving elastic wires, and the elastic wires sequentially penetrate through the connecting holes in the upper end plate and the lower end plate to complete weaving.

And the outer part of the fiber bundle is coated with an annular sleeve, and the upper end and the lower end of the annular sleeve are fixedly connected with the upper end plate and the lower end plate respectively.

The beneficial effects of one or more of the above technical solutions are as follows:

1) the mode that the elastic inner core is not connected with the upper end plate and the lower end plate is adopted, the elastic inner core supports the space between the upper end plate and the lower end plate only through elastic deformation, the fiber bundle formed by the elastic wires limits the relative rotation between the upper end plate and the lower end plate, the damping required to be overcome when the upper end plate and the lower end plate move can be controlled by the tightness degree of the fiber bundle, and the problems of discomfort of the body of a patient, compensation of the subsequent body, ectopic ossification and the like caused when the mobility degree of the artificial intervertebral disc is too easy or difficult are avoided.

2) Adopt annular cover structure, annular cover can avoid fibre bundle and elastic core to produce the piece outflow when avoiding the contact of outside tissue muscle and fibre bundle. Meanwhile, the annular sleeve can provide damping when the artificial intervertebral disc deforms, and the problem of overlarge activity of the intervertebral disc is avoided.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.

FIG. 1 is an isometric view of an overall structure in an embodiment of the disclosure;

FIG. 2 is a schematic structural view of the overall structure of an embodiment of the disclosure with the collar, fiber bundle, and cover plate removed;

FIG. 3 is a schematic structural view of the fiber bundle wrapped around the elastic core by weaving according to an embodiment of the present disclosure;

FIG. 4 is a schematic structural diagram of a resilient core in an embodiment of the present disclosure;

FIG. 5 is a schematic view of the configuration of the upper endplate in an embodiment of the present disclosure;

FIG. 6 is a schematic diagram of the structure of an annular sleeve in an embodiment of the disclosure;

fig. 7 is a schematic structural diagram of a cover plate in an embodiment of the disclosure.

In the figure: 1. a cover plate; 2. an upper endplate; 3. a protrusion; 4. an annular groove; 5. an elastic inner core; 6. an annular sleeve; 7. connecting holes; 8. a lower endplate; 9. positioning blocks; 10. a fiber bundle; 11. and (7) positioning the holes.

Detailed Description

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

In an exemplary embodiment of the present disclosure, as shown in fig. 1-7, a damped prosthetic intervertebral disc includes an upper endplate 2 and a lower endplate 8 arranged in sequence from top to bottom, the upper endplate 2 and the lower endplate 8 being respectively used for connecting adjacent vertebrae. The upper end face of the upper end plate 2 and the lower end face of the lower end plate 8 are respectively provided with a protrusion 3, and one end, far away from the elastic core 5, of each protrusion 3 is of a conical structure.

Specifically, the upper end plate 2 and the lower end plate 8 are both made of titanium alloy, so that the imaging observation can be facilitated, and the upper end plate 2 and the lower end plate 8 are in disc-shaped or oval structures. The upper surface of the upper end plate 2 and the lower surface of the lower end plate 8 are spherical surfaces and are used for being attached to the surface of a vertebral body, and the rough pure titanium coating is arranged on the upper surface of the upper end plate and is beneficial to the growth of bone tissues in months. Meanwhile, the bulge 3 is arranged on the artificial intervertebral disc, and the bulge 3 is inserted into the cartilage of the vertebral body after the artificial intervertebral disc is installed, so that the connection between the artificial intervertebral disc and the vertebral body is enhanced, and the stability is improved.

An elastic inner core 5 is arranged between the upper end plate 2 and the lower end plate 8, the elastic inner core 5 is used for filling the space between the upper end plate 2 and the lower end plate 8, and the upper end and the lower end of the elastic inner core 5 are respectively attached to the upper end plate 2 and the lower end plate 8; the elastic inner core 5 is of a cylindrical structure, the upper end and the lower end of the elastic inner core 5 are of arc-shaped convex structures, arc-shaped grooves are formed in the lower surface of the upper end plate 2 and the upper surface of the lower end plate 8, and the arc-shaped grooves are matched with the upper end face and the lower end face of the elastic inner core 5 to achieve fitting.

Specifically, the elastic inner core 5 can be made of medical implant-grade silica gel or polycarbonate-urethane polymer material, and the like, can simulate the rigidity and the function of the physiological nucleus pulposus of the intervertebral disc, and has the characteristics of support and load buffering.

The upper end plate 2 and the lower end plate 8 are respectively provided with at least one circle of connecting holes 7, the elastic inner core 5 is externally coated with a fiber bundle 10, the fiber bundle 10 is formed by weaving elastic wires, and the elastic wires sequentially penetrate through the connecting holes 7 in the upper end plate 2 and the lower end plate 8 to complete weaving. The upper end face of the upper end plate 2 and the lower end face of the lower end plate 8 are respectively provided with an annular groove 4, and the annular grooves 4 are uniformly provided with the connecting holes 7. The elastic threads are obliquely woven to form the fiber bundle 10. The fiber bundles 10 are of a multilayer structure, the inclined directions of the elastic threads in each layer of fiber bundles 10 are the same, and the inclined directions of the elastic threads in two adjacent layers of fiber bundles 10 are different.

In particular, the elastic thread may be a polyethylene fiber, a polyester suture, a surgical patch, or the like. The fiber bundle 10 is woven through the connecting holes 7 of the upper and lower end plates 8, and can be woven for one circle or more circles to connect all the parts into a whole; when the device is stretched and rotated, the generated tension can limit the movement of the system and simulate the function of the physiological intervertebral disc annulus.

The fiber bundle 10 is externally covered with an annular sleeve, and the upper end and the lower end of the annular sleeve are fixedly connected with the upper end plate 2 and the lower end plate 8 respectively.

In this embodiment, a circle of positioning holes 11 may be uniformly distributed in the annular groove 4, positioning blocks 9 may be respectively disposed at the upper and lower ends of the annular sleeve 6, and the positioning blocks 9 are inserted into the positioning holes 11 to fix the two.

The annular sleeve is flexible material, the locating piece is set up to: under the condition of no pressure, the size of the positioning block is larger than that of the positioning hole so as to prevent the positioning block from retracting from the positioning hole.

A cover plate 1 is arranged in the annular groove 4, and the cover plate 1 is used for filling the annular groove 4.

The positioning holes are arranged around the outside of the connecting hole 7.

The working principle is as follows:

when the intervertebral disc is anteflexion: the distance between the front ends of the upper end plate 2 and the lower end plate 8 is reduced, the distance between the rear ends is enlarged, the rear ends of the upper end plate 2 and the lower end plate 8 are opened, the front end fiber bundle 10 is prevented from loosening, and the rear end fiber bundle 10 is tensioned and stressed to realize limiting. At the moment, one side of the elastic inner core 5 close to the front end of the upper end plate 2 is compressed, and one side close to the rear end of the upper end plate 2 is expanded. Meanwhile, because the space of the front ends of the upper end plate 2 and the lower end plate 8 is reduced and the space of the rear ends is increased, the elastic inner core 5 moves a certain distance towards the rear end of the supporting space, and the elastic inner core 5 is ensured to be filled in the whole supporting space.

When the intervertebral disc is bent backwards: when the intervertebral disc is retroflexed: the distance between the rear ends of the upper end plate 2 and the lower end plate 8 is reduced, the distance between the front ends is enlarged, the front ends of the upper end plate 2 and the lower end plate 8 are opened, the rear end fiber bundle 10 is prevented from loosening, and the front end fiber bundle 10 is tensioned and stressed to realize limiting. At the moment, one side of the elastic inner core 5 close to the rear end of the upper end plate 2 is compressed, and one side close to the front end of the upper end plate 2 is expanded. Meanwhile, because the space of the rear ends of the upper end plate 2 and the lower end plate 8 is reduced and the space of the front ends is increased, the elastic inner core 5 moves a certain distance towards the front end of the supporting space, and the elastic inner core 5 is ensured to be filled in the whole supporting space.

When the intervertebral disc undergoes left and right lateral flexion, the motion states of the various parts are similar to those of the parts bending backwards and forwards, and are not described again here.

When the intervertebral disc rotates: the fiber bundle 10 and the annular sleeve are deformed axially, the upper end plate 2 and the lower end plate 8 rotate relatively, and the elastic inner core 5 is not deformed and only provides a supporting function.

Although the present disclosure has been described with reference to specific embodiments, it should be understood that the scope of the present disclosure is not limited thereto, and those skilled in the art will appreciate that various modifications and changes can be made without departing from the spirit and scope of the present disclosure.