CN108836580A - Artificial intervertebral disk frame body - Google Patents

Abstract

The invention provides an artificial intervertebral disc prosthesis, comprising: an upper endplate, the bottom of the upper endplate is provided with a positioning part; a lower endplate, the top of the lower endplate is provided with a limiting part; nucleus pulposus, the The bottom of the nucleus pulposus is limited on the lower endplate by a limiting part, and the top of the nucleus pulposus is located in the positioning part; the elastic connecting device, the bottom of the elastic connecting device is connected to the lower endplate, so The top end of the elastic connecting device is connected to the upper endplate. Since the top of the elastic connecting device in the present invention is connected to the upper endplate and the bottom is connected to the lower endplate, the function of preventing dislocation of the artificial intervertebral disc prosthesis can be realized through the connecting function of the elastic connecting device.

Description

Artificial disc frame

technical field

The invention relates to the technical field of medical prostheses, in particular to an artificial intervertebral disc frame.

Background technique

At present, the intervertebral disc prosthesis on the market is mainly composed of three parts: the upper endplate, the nucleus pulposus, and the lower endplate. Most of the products on the market are an upper endplate with a ball socket, a spherical nucleus pulposus, and a lower endplate that restricts the movement of the nucleus pulposus.

The above-mentioned intervertebral disc frame also has the following defects: while pursuing high mobility, due to factors such as the design of the intervertebral disc prosthesis or excessive exercise of the patient, the rate of artificial intervertebral disc dislocation is relatively high.

Moreover, the current intervertebral disc prosthesis is rigid in design, and it is difficult to meet the elastic demand of the normal intervertebral disc of the human body only by the elasticity of the plastic nucleus pulposus component itself.

Therefore, there is an urgent need for an artificial intervertebral disc prosthesis on the market, which can ensure high mobility while ensuring that the artificial intervertebral disc prosthesis does not have the risk of dislocation and has a certain degree of elasticity.

Contents of the invention

The main purpose of the present invention is to provide an artificial intervertebral disc frame to solve the problem of easy dislocation of the artificial intervertebral disc prosthesis in the prior art.

In order to achieve the above object, according to one aspect of the present invention, an artificial intervertebral disc prosthesis is provided, comprising: an upper endplate, the bottom of which is provided with a positioning part; a lower endplate, the top of which is A limiting portion is set; the nucleus pulposus, the bottom of the nucleus pulposus is limited on the lower endplate by the limiting portion, and the top of the nucleus pulposus is located in the positioning portion; the elastic connecting device, the bottom of the elastic connecting device connected to the lower endplate, and the top end of the elastic connecting device is connected to the upper endplate.

Further, the bottom of the upper end plate is provided with an upper connection groove, and the top of the lower end plate is provided with a lower connection groove; the elastic connection device includes at least one elastic connection post, and the elastic connection post includes an upper connection head, a lower connector, and an elastic cylinder connected between the upper connector and the lower connector, the upper connector is installed in the upper connection groove, and the lower connector is connected to the lower connector in the connection slot.

Further, both the upper connecting groove and the lower connecting groove are T-shaped grooves, and the upper connecting head and the lower connecting head are both provided with annular outer flanges matching the T-shaped grooves.

Further, the nucleus pulposus is an ellipsoid, and the positioning part is an ellipsoid socket adapted to the ellipsoid.

Further, the limiting part includes an ellipsoidal groove and a limiting post, the limiting post is located in the ellipsoidal groove, and the nucleus pulposus is movably mounted on the limiting post.

Further, the nucleus pulposus is provided with a through hole or a groove adapted to the limiting column, and the nucleus pulposus is installed on the limiting column through the through hole or the groove.

Further, the nucleus pulposus is made of plastic material, and at least one honeycomb hole is arranged on the nucleus pulposus, and the honeycomb hole is arranged parallel to or inclined to the upper endplate.

Further, the elastic connecting device includes two elastic connecting posts, and the two elastic connecting posts are arranged symmetrically on both sides of the nucleus pulposus.

Further, both the upper surface of the upper endplate and the lower surface of the lower endplate are provided with anti-rotation thorns.

Further, the anti-spin is a triangular block, a trapezoidal block or a quadrilateral block.

Further, the upper surface of the upper endplate and the lower surface of the lower endplate are both configured as porous structures.

Applying the technical solution of the present invention, since the top of the elastic connecting device in the present invention is connected to the upper endplate, and the bottom is connected to the lower endplate, through the connecting function of the elastic connecting device, the dislocation prevention function of the artificial intervertebral disc prosthesis can be realized .

Description of drawings

The accompanying drawings constituting a part of the present application are used to provide a further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention. In the attached picture:

Fig. 1 schematically shows an exploded view of the artificial intervertebral disc prosthesis of the present invention;

Fig. 2 schematically shows a sectional view of the artificial intervertebral disc prosthesis of the present invention;

Figure 3 schematically shows a perspective view of the upper endplate of the present invention;

Figure 4 schematically shows a front view of the upper endplate of the present invention;

Fig. 5 schematically shows the front view of the nucleus pulposus of the present invention;

Figure 6 schematically shows a side view of the nucleus pulposus of the present invention;

Figure 7 schematically shows a top view of the lower endplate of the present invention;

Fig. 8 schematically shows a cross-sectional view of A-A in Fig. 7;

Fig. 9 schematically shows a perspective view of the elastic connecting column of the present invention.

Wherein, the above-mentioned accompanying drawings include the following reference signs:

10. Upper endplate; 11. Positioning part; 12. Upper connecting groove; 20. Lower endplate; 21. Limiting part; 211. Ellipsoidal groove; 212. Limiting post; 22. Lower connecting groove; 30. Nucleus pulposus; 31, groove; 32, honeycomb hole; 40, elastic connecting device; 41, elastic connecting column; 411, elastic cylinder; 412, upper connecting head; 413, lower connecting head; 414, annular outer flange; 50, anti-spin thorn.

Detailed ways

It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and/or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and/or combinations thereof.

It should be noted that the terms "first" and "second" in the description and claims of the present application and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein, for example, can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a sequence of steps or elements is not necessarily limited to the expressly listed instead, may include other steps or elements not explicitly listed or inherent to the process, method, product or apparatus.

For the convenience of description, spatially relative terms may be used here, such as "on ...", "over ...", "on the surface of ...", "above", etc., to describe the The spatial positional relationship between one device or feature shown and other devices or features. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, devices described as "above" or "above" other devices or configurations would then be oriented "beneath" or "above" the other devices or configurations. under other devices or configurations”. Thus, the exemplary term "above" can encompass both an orientation of "above" and "beneath". The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptions used herein interpreted accordingly.

Referring to FIGS. 1 to 9 , according to an embodiment of the present invention, an artificial intervertebral disc prosthesis is provided. The artificial intervertebral disc prosthesis includes an upper endplate 10 , a lower endplate 20 , a nucleus pulposus 30 and an elastic connection device 40 .

Wherein, the bottom of the upper endplate 10 is provided with a positioning part 11; the top of the lower endplate 20 is provided with a limiting part 21; the bottom of the nucleus pulposus 30 is limited on the lower endplate 20 by the limiting part 21, and the top of the nucleus pulposus 30 is positioned The inner portion 11 facilitates the installation and positioning of the nucleus pulposus 30;

Since the top of the elastic connecting device 40 in this embodiment is connected to the upper endplate 10 and the bottom is connected to the lower endplate 20, the function of preventing dislocation of the artificial intervertebral disc prosthesis can be realized through the connecting function of the elastic connecting device 40 .

In order to facilitate connection and installation, the bottom of the upper end plate 10 in this embodiment is provided with an upper connecting groove 12, and correspondingly, the top of the lower end plate 20 is provided with a lower connecting groove 22; and the elastic connecting device 40 includes at least one elastic Connecting post 41, the elastic connecting post 41 includes an upper connecting head 412, a lower connecting head 413, and an elastic cylinder 411 connected between the upper connecting head 412 and the lower connecting head 413. When installed, the upper connecting head 412 is connected to the upper In the connecting groove 12 , the lower connecting head 413 is connected in the lower connecting groove 22 .

In a preferred embodiment of the present invention, the elastic connecting device 40 includes two elastic connecting posts 41, which are symmetrically arranged on both sides of the nucleus pulposus 30, and the structure is stable and reliable, which can effectively prevent artificial intervertebral disc false. Body dislocation occurs. Of course, in other embodiments of the present invention, three or more elastic connecting posts 41 may also be provided.

Preferably, the upper connecting groove 12 and the lower connecting groove 22 in this embodiment are both T-shaped grooves, and the upper connecting head 412 and the lower connecting head 413 are provided with annular outer flanges 414 matching the T-shaped grooves, Through the cooperative connection between the annular outer flange 414 and the T-shaped groove, the elastic connecting column 41 can be effectively prevented from falling off from the upper connecting groove 12 and the lower connecting groove 22 , and the structure is stable and reliable.

Of course, in other embodiments of the present invention, other fasteners or snap-fits can also be used to connect the elastic connecting post 41 to the upper endplate 10 and the lower endplate 20, as long as it is under the conception of the present invention All deformation methods are within the protection scope of the present invention.

As shown in Fig. 1 and Fig. 2 again, the nucleus pulposus 30 in the present embodiment is an ellipsoid, and the positioning part 11 is an ellipsoid socket matched with the ellipsoid image, through the effect of the ellipsoid socket, it is convenient to adjust the The nucleus pulposus 30 is positioned. The nucleus pulposus 30 is made of plastic material, and at least one honeycomb hole 32 is arranged on the nucleus pulposus 30, which can achieve a certain elasticity (up and down direction) under pressure. Preferably, the honeycomb hole 32 is arranged parallel to or inclined to the upper endplate 10, which makes the nucleus pulposus 30 deform to a certain extent under the action of pressure to achieve a certain degree of elasticity, and the elastic connection between the upper endplate 10 and the lower endplate 20 The device 40 is also elastically designed so that the artificial intervertebral disc prosthesis has a certain degree of elasticity.

Referring again to Fig. 1 to Fig. 9, the limiting part 21 in this embodiment includes an ellipsoidal groove 211 and a limiting post 212, the limiting post 212 is located in the ellipsoidal groove 211, and the nucleus pulposus 30 is movably installed On the limit post 212. The nucleus pulposus 30 is embedded in the limiting column of the lower endplate 20 to realize the connection between the nucleus pulposus 30 and the lower endplate 20. The nucleus pulposus 30 can rotate around the limiting column 212, and can also move axially along the limiting column 212, satisfying Physiological needs of the human body.

The nucleus pulposus 30 in this embodiment is provided with a through hole or a groove 31 adapted to the limiting column 212, the nucleus pulposus 30 is installed on the limiting column 212 through the through hole or the groove 31, the structure is simple, and it is easy to install .

Preferably, the upper surface of the upper endplate 10 and the lower surface of the lower endplate 20 in this embodiment are both provided with anti-rotation thorns 50 . The anti-rotation thorn 50 is a triangular block or a trapezoidal block or a quadrilateral block. Of course, in other embodiments of the present invention, the anti-rotation thorn 50 can also be set to other structures that can prevent the rotation of the artificial intervertebral disc prosthesis, as long as it is within the concept of the present invention The following other deformation methods are all within the protection scope of the present invention.

According to the above structure, it can be known that the artificial intervertebral disc prosthesis in this embodiment is shown in FIG. 1 .

Wherein, the upper end plate 10 includes: a positioning part 11, which matches the ellipsoid shape of the nucleus pulposus 30; an upper connecting groove 12, which cooperates with the elastic connecting device 40, and the elastic connecting device 40 is embedded in the upper connecting groove 12; anti-rotation thorns 50, the anti-rotation thorns 50 contact with the endplate of the human body after implantation, can prevent the rotation of the artificial intervertebral disc prosthesis and increase the stability, as shown in Fig. 3 and Fig. 4 .

As shown in Figures 5 and 6, the nucleus pulposus 30 is ellipsoidal, and its mobility is more in line with the physiological needs of the human body. The nucleus pulposus 30 is provided with honeycomb holes 32, which can achieve a certain degree of elasticity (up and down) under pressure; The groove 31 is embedded in the limiting column 212 of the lower endplate 20 to realize the connection between the nucleus pulposus 30 and the lower endplate 20 , and the nucleus pulposus 30 can rotate around the limiting column 212 or move axially along the limiting column 212 .

As shown in Figures 7 and 8, the lower endplate 20 includes a limiting column 212, which is connected to the nucleus pulposus 30 through a groove 31; the lower connecting groove 22, and the elastic connecting device 40 is embedded in the lower connecting groove 22; The anti-rotation 50, the anti-rotation 50 is arranged on the bottom surface of the lower endplate 20, and the anti-rotation 50 contacts with the endplate of the human body after implantation, which can prevent the rotation of the prosthesis and increase the stability; the ellipsoidal groove 211, the ellipsoidal concave The groove 211 provides a moving space for the nucleus pulposus 30 .

Fig. 2 is a cross-sectional view of the artificial intervertebral disc prosthesis of the present invention after assembly, the nucleus pulposus 30 is ellipsoidal, the upper half is embedded in the positioning part 11 of the upper endplate 10, and the lower half is snapped into the limiting column through the groove 31 212 forms a connection with the lower endplate 20, and the lower half of the nucleus pulposus 30 can move in the ellipsoidal groove 211 of the lower endplate 20; currently the nucleus pulposus 30 on the market is mostly spherical, and the ellipsoid in this embodiment The spherical shape is more in line with the physiological activity needs of the human body. The upper endplate 10 can rotate on the ellipsoid nucleus pulposus 30, and the nucleus pulposus 30 can slide along the axis of the limit post 212. When the space is actually set, the diameter of the groove 31 is larger than that of the limiting post 212, so the nucleus pulposus 30 can also be displaced in a direction perpendicular to the axial direction of the limiting post 212, thereby achieving high mobility.

In this embodiment, the upper endplate 10 and the lower endplate 20 are connected together through the elastic connecting device 40, the upper connecting head 412 of the elastic connecting column 41 is embedded in the upper connecting groove 12 of the upper endplate 10, and the lower connecting head 413 is embedded in the lower endplate 10. In the lower connecting groove 22 of the end plate 20, the middle part of the elastic connecting device, that is, the elastic column 411 is an elastic member that can expand and contract when the upper end plate 10 rotates or axially displaces. At the same time, dislocation is limited; both the upper endplate 10 and the lower endplate 20 have anti-rotation thorns 50, which can prevent the prosthesis from rotating or slipping after implantation, and increase stability. The invention enables the prosthesis to have high mobility after implantation without the risk of dislocation and prolongs the life of the prosthesis.

The nucleus pulposus 30 in the present invention is a plastic component with many honeycomb holes 32, which can make it have certain elasticity under pressure, increase the postoperative experience of the patient, and prolong the life of the prosthesis as well. In addition, the nucleus pulposus 30 can be centered, or the nucleus pulposus 30 can be designed to be offset according to the anatomical activity center of the human body. The upper surface of the upper endplate 10 and the lower surface of the lower endplate 20 in the present invention can be designed as a coating for inducing bone ingrowth, or as a porous structure suitable for bone ingrowth.

From the above description, it can be seen that the above-mentioned embodiments of the present invention have achieved the following technical effects:

1. Compared with the prosthesis on the market, the structure of the artificial intervertebral disc prosthesis of the present invention includes an elastic connection device in addition to the upper endplate, nucleus pulposus, and lower endplate, which can prevent dislocation;

2. The lower endplate of the present invention is not designed as a flat plate, but also has a ball and socket for the rotation of the nucleus pulposus, and has a limiting column, which allows the nucleus pulposus to slide left and right along the limiting column while rotating around the limiting column. In order to realize the needs of the left and right movement of the human intervertebral disc; provide the needs of forward and backward rotation, left and right rotation, left and right sliding and sliding forward and backward;

3. The nucleus pulposus prosthesis of the present invention presents a honeycomb shape, which makes the nucleus pulposus deform to a certain extent under the action of pressure to achieve certain elasticity, and the connection device between the upper endplate and the lower endplate is also designed elastically, which can Make the prosthesis have a certain degree of elasticity.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (11)

1. An artificial intervertebral disc prosthesis, comprising: The upper endplate (10), the bottom of the upper endplate (10) is provided with a positioning part (11); A lower endplate (20), the top of the lower endplate (20) is provided with a limiting part (21); The nucleus pulposus (30), the bottom of the nucleus pulposus (30) is limited on the lower endplate (20) by the limiting part (21), and the top of the nucleus pulposus (30) is located at the positioning part (11 )Inside; An elastic connection device (40), the bottom of the elastic connection device (40) is connected to the lower endplate (20), and the top end of the elastic connection device (40) is connected to the upper endplate (10) . 2. The artificial intervertebral disc prosthesis according to claim 1, characterized in that, the bottom of the upper endplate (10) is provided with an upper connection groove (12), and the top of the lower endplate (20) is provided with a lower Connecting groove (22); The elastic connecting device (40) includes at least one elastic connecting column (41), and the elastic connecting column (41) includes an upper connecting head (412), a lower connecting head (413) and a connecting head (413) connected to the upper connecting head ( 412) and the elastic column (411) between the lower connector (413), the upper connector (412) is installed in the upper connection groove (12), and the lower connector (413) is connected in the lower connecting groove (22). 3. artificial intervertebral disc prosthesis according to claim 2, is characterized in that, described upper connecting groove (12) and described lower connecting groove (22) are T-shaped grooves, and described upper connecting head (412) and The lower connectors (413) are provided with annular outer flanges (414) adapted to the T-shaped slots. 4. The artificial intervertebral disc prosthesis according to claim 1, characterized in that, the nucleus pulposus (30) is an ellipsoid, and the positioning part (11) is an ellipsoid socket adapted to the ellipsoid. 5. The artificial intervertebral disc prosthesis according to claim 1, characterized in that, the limiting part (21) comprises an ellipsoidal groove (211) and a limiting column (212), and the limiting column (212) Located in the elliptical groove (211), the nucleus pulposus (30) is movably installed on the limiting post (212). 6. The artificial intervertebral disc prosthesis according to claim 5, characterized in that, said nucleus pulposus (30) is provided with a through hole or a groove (31) adapted to said limiting post (212), The nucleus pulposus (30) is installed on the limiting post (212) through the through hole or the groove (31). 7. artificial intervertebral disc prosthesis according to claim 1, is characterized in that, described nucleus pulposus (30) adopts plastic material to make, and described nucleus pulposus (30) is provided with at least one honeycomb hole (32), The honeycomb holes (32) are arranged parallel or inclined to the upper end plate (10). 8. The artificial intervertebral disc prosthesis according to claim 2, characterized in that, the elastic connecting device (40) comprises two elastic connecting columns (41), and the two elastic connecting columns (41) are arranged symmetrically on both sides of the nucleus pulposus (30). 9. The artificial intervertebral disc prosthesis according to claim 1, characterized in that anti-rotation thorns (50) are provided on the upper surface of the upper endplate (10) and the lower surface of the lower endplate (20). 10. The artificial intervertebral disc prosthesis according to claim 9, characterized in that, the anti-rotation thorn (50) is a triangular block, a trapezoidal block or a quadrangular block. 11. The artificial intervertebral disc prosthesis according to any one of claims 1 to 10, characterized in that, the upper surface of the upper endplate (10) and the lower surface of the lower endplate (20) are all set to porous structure.