CN108836579B - Artificial Disc Prosthesis - Google Patents

Abstract

The present invention provides an artificial intervertebral disc prosthesis comprising: the bottom of the upper end plate is provided with a positioning part; the top of the lower end plate is provided with a limiting part; a nucleus, the bottom of the nucleus being defined on the lower endplate by a stop, the top of the nucleus being located within the locating portion; and the bottom of the elastic connecting device is connected to the nucleus pulposus, and the top end of the elastic connecting device is connected to the upper endplate. Because the elastic connecting device is arranged in the artificial intervertebral disc prosthesis, when the artificial intervertebral disc prosthesis is actually installed, the nucleus pulposus is limited and installed between the upper end plate and the lower end plate through the limiting part and the positioning part, and is connected with the upper end plate through the elastic connecting device, and dislocation of the artificial intervertebral disc prosthesis can be prevented through the action of the elastic connecting device.

Description

Artificial Disc Prosthesis

technical field

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

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 prosthesis also has the following defects: while pursuing high mobility, due to factors such as the design of the intervertebral disc prosthesis or excessive movement 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 prosthesis 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 It is connected to the nucleus pulposus, and the top end of the elastic connection device is connected to the upper endplate.

Further, the top of the nucleus pulposus is an ellipsoid, the ellipsoid is made of rubber material, and the positioning part is an ellipsoid socket matching the ellipsoid.

Further, at least one honeycomb hole is provided on the ellipsoidal portion, and the honeycomb hole is arranged parallel to or inclined to the upper end plate.

Further, the nucleus pulposus also includes an elastic base, the ellipse is located on the elastic base, and the elastic base is provided with a positioning outer flange integrated with the elastic base, and the limiting part is A card slot, and the positioning outer flange is clearance-fitted in the card slot.

Further, an elastic component is provided between the elastic base and the ellipse.

Further, a positioning post is provided on the nucleus pulposus, the elastic connecting device includes an elastic connecting post, and a positioning groove matching the positioning post is provided at the bottom of the elastic connecting post.

Further, the top end of the elastic connecting column is provided with a connecting ball head, and the bottom of the upper end plate is provided with a connecting groove, and the connecting ball head is installed in the connecting groove.

Further, the opening width of the connecting groove is smaller than the diameter of the connecting ball head.

Further, the connecting groove is a straight groove, and the straight groove communicates with the positioning part.

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 artificial intervertebral disc prosthesis in the present invention is provided with an elastic connecting device, during actual installation, the nucleus pulposus is limited and installed between the upper endplate and the lower endplate by the limiting part and the positioning part, and The nucleus pulposus and the upper end plate are connected by an elastic connection device, and the artificial intervertebral disc prosthesis can be prevented from dislocation through the function of the elastic connection device.

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 bottom view of the upper endplate of the present invention;

Figure 5 schematically shows a front view of the upper endplate of the present invention;

Fig. 6 schematically shows the front view of the nucleus pulposus of the present invention;

Figure 7 schematically shows a perspective view of the nucleus pulposus of the present invention;

Figure 8 schematically shows a perspective view of the lower endplate of the present invention;

Figure 9 schematically shows a top view of the lower endplate of the present invention;

Fig. 10 schematically shows a cross-sectional view of A-A in Fig. 9;

Fig. 11 schematically shows a front 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. Connection groove; 20. Lower endplate; 21. Limiting part; 30. Nucleus pulposus; 31. Ellipsoid part; , positioning outer flange; 33, elastic component; 34, positioning column; 40, elastic connecting device; 41, elastic connecting column; 411, connecting ball head; 412, positioning groove; 50, anti-rotation 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 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 11 , 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 end plate 10 is provided with a positioning portion 11; the top of the lower end plate 20 is provided with a limiting portion 21; during installation, the bottom of the nucleus pulposus 30 is limited on the lower end plate 20 by the limiting portion 21, and the nucleus pulposus 30 The top of the elastic connecting device 40 is located in the positioning part 11 to facilitate the positioning and installation of the nucleus pulposus 30 ;

Since the artificial intervertebral disc prosthesis in this embodiment is provided with an elastic connecting device 40, during actual installation, the nucleus pulposus 30 is limited and installed between the upper endplate 10 and the lower endplate 20 by the limiting part 21 and the positioning part 11, and The nucleus pulposus 30 and the upper endplate 10 are connected by the elastic connection device 40 , and the artificial intervertebral disc prosthesis can be prevented from dislocation through the function of the elastic connection device 40 .

The top of the nucleus pulposus 30 in this embodiment is an ellipsoidal portion 31, which is made of rubber material, and the positioning portion 11 is an ellipsoidal socket suitable for the ellipsoidal portion 31, which is convenient for aligning the ellipsoidal portion. 31 for positioning. The ellipsoid 31 in this embodiment has a certain elastic function, and the elastic connecting device 40 also has an elastic function, so that the whole artificial intervertebral disc prosthesis is closer to the physiological characteristics of the human body, and the artificial intervertebral disc prosthesis can offset part of the Stress, reduce the force of the artificial intervertebral disc prosthesis, thereby increasing the life of the artificial intervertebral disc prosthesis. At the same time, the ellipsoid 31 in this embodiment can move in the ellipsoid socket, and the activity of the ellipsoid 31 is more in line with the physiological needs of the human body. The ellipsoid 31 is provided with at least one honeycomb hole 311, and the honeycomb hole 311 Parallel or oblique to the upper endplate 10, a certain degree of elasticity (up-and-down direction) can be achieved under pressure.

Certainly, in other embodiments of the present invention, the ellipsoidal portion 31 may also be set as a spherical portion, as long as other deformations are within the scope of the present invention, they are within the protection scope of the present invention. However, the ellipsoidal portion 31 is more in line with the physiological needs of the human body.

The nucleus pulposus 30 also includes an elastic base 32. The ellipsoid 31 is located on the elastic base 32. The elastic base 32 is provided with a positioning outer flange 321 integrally provided with the elastic base 32. The limiting portion 21 is a slot for positioning the outer flange. 321 is clamped in the slot, so as to facilitate the fixed installation of the nucleus pulposus 30 on the lower endplate 20 .

Preferably, an elastic member 33 is provided between the elastic base 32 and the ellipsoidal portion 31. The elastic member 33 can provide elasticity when the upper endplate 10 rotates along the nucleus pulposus 30. One of the advantages is that it can offset part of the stress and extend the length of the pseudo-suspension. The second advantage is that this structure is closer to the physiological anatomy of the human body, which improves the postoperative experience of patients. In actual design, the elastic member 33 in this embodiment is a columnar rubber member or other elastic structural members.

In order to install the elastic connecting device 40, the nucleus pulposus 30 in this embodiment is provided with a positioning post 34, the elastic connecting device 40 includes an elastic connecting post 41, and the bottom of the elastic connecting post 41 is provided with a positioning groove that matches the positioning post 34 412 , realize the connection between the elastic connecting post 41 and the nucleus pulposus 30 .

Specifically, the top end of the elastic connecting post 41 is provided with a connecting ball head 411, and the bottom of the upper end plate 10 is provided with a connecting groove 12. connection, and can realize the free rotation and anti-off function of the artificial intervertebral disc prosthesis.

The opening width of the connection groove 12 in this embodiment is smaller than the diameter of the connection ball head 411, which can prevent the connection ball head 411 from coming out of the connection groove 12, and the structure is stable and reliable. The connecting groove 12 in this embodiment is a linear groove, which communicates with the positioning part 11. During actual installation, the connecting ball head 411 is slid into the linear groove from the side of the positioning part 11. During use, the connecting ball head 411 can be Realize left and right movement along the connection groove 12 to meet the needs of the artificial intervertebral disc prosthesis to move left and right; the positioning groove 412 and the positioning column 34 on the nucleus pulposus 30 are snapped into assembly, the positioning column 34 is set parallel to the lower endplate 20, and the positioning groove 412 is set On the side of the elastic connecting post 41 , the rotatable fit of the elastic connecting post 41 is realized. Wherein, the elastic connecting device 40 has an elastic connecting column 41, which can generate a certain elasticity together with the nucleus pulposus 30 when the upper endplate 10 is pressed down, so as to realize the elastic effect of the intervertebral disc.

Referring to Fig. 2, the elastic connecting device 40 in this embodiment includes two elastic connecting columns 41, and the two elastic connecting columns 41 are arranged symmetrically on both sides of the nucleus pulposus 30, the structure is simple, and the artificial intervertebral disc prosthesis can be effectively prevented from occurring. Dislocation phenomenon.

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, matching with the ellipsoid part 31 of the nucleus pulposus 30; a connecting groove 12, cooperating with the elastic connecting device 40, the connecting ball head 411 of the elastic connecting device 40 is embedded in the connecting groove 12, and can be Left and right sliding and front and rear micro-movement are realized in the connection groove 12 to meet the needs of normal human anatomy; the anti-rotation thorn 50, after implantation, contacts with the human endplate, can prevent the rotation of the prosthesis and increase the stability , as shown in Figures 3 to 5.

As shown in Figures 6 and 7, the nucleus pulposus 30 includes an ellipsoidal portion 31, which can also be designed as a spherical shape as required, but the activity of the ellipsoidal portion 31 is more in line with the physiological needs of the human body, and the ellipsoidal portion 31 is provided with honeycomb holes 311 , can realize a certain elasticity (up and down direction) under the action of pressure; the nucleus pulposus 30 includes and also includes an elastic member 33, and the elastic member 33 can provide elasticity when the upper endplate 10 rotates along the nucleus pulposus 30. The advantages are: one, It can offset part of the stress and prolong the life of the prosthesis. Second, it is closer to the physiological anatomy of the human body and improves the patient's postoperative experience. Cooperate with the positioning groove 412 on the elastic connecting column 41 to realize the connection between the elastic connecting device 40 and the nucleus pulposus 30 ; the elliptical part 31 cooperates with the elliptical socket of the upper endplate 10 to realize free rotation.

As shown in FIGS. 8 to 10 , the lower endplate 20 in this embodiment includes a limiting portion 21 , and the positioning outer flange 321 on the nucleus pulposus 30 is embedded in it, so that the nucleus pulposus 30 does not protrude from the limiting portion 21 , and through the design of the gap, the nucleus pulposus 30 can move freely within a certain range; the bottom of the lower endplate 20 is provided with an anti-rotation thorn 50, and the anti-rotation thorn 50 contacts with the endplate of the human body after implantation, which can prevent artificial Rotation of the disc prosthesis for increased stability.

As shown in FIG. 11 , the elastic connection device 40 in this embodiment includes an elastic connection post 41, and the elastic connection post 41 includes a connection ball head 411, and the connection ball head 411 is embedded in the connection groove 12 on the upper end plate 10, The diameter of the connecting ball head 411 is greater than the width of the opening of the connecting groove 12, so the connecting ball head 411 will not escape from the connecting groove 12, and can slide left and right along the connecting groove 12 to meet the left and right movement needs of the artificial intervertebral disc prosthesis; , the elastic connection device 40 is an elastic component, which can generate a certain elasticity together with the nucleus pulposus 30 when the upper endplate 10 is pressed down, so as to realize the elastic effect of the intervertebral disc.

Fig. 2 is the cross-sectional view of the artificial intervertebral disc prosthesis of the present invention after assembly, the nucleus pulposus 30 comprises an ellipsoidal part 31, the ellipsoidal surface is embedded in the ellipsoidal socket of the upper endplate 10, and the lower half is embedded in the lower part by positioning the outer flange 321 In the draw-in groove of the endplate 20, the connection with the lower endplate 20 is realized, and the diameter of the positioning outer flange 321 is greater than the diameter of the opening of the draw-in groove, so the nucleus pulposus 30 will not be separated from the lower endplate 20, and can be placed in the draw-in groove. The nucleus pulposus 30 forms a connection with the upper endplate 10 through the elastic connecting device 40, the positioning post 34 on the nucleus pulposus 30 snaps into the positioning groove 412 on the elastic connecting post 41, and the elastic connecting device 40 can surround the positioning post 34 realizes the rotation and will not come out, so that the upper endplate 10 forms a non-dislocated connection with the nucleus pulposus 30, that is, the upper endplate 10 forms a non-dislocated connection with the nucleus pulposus 30, and the nucleus pulposus 30 forms an inseparable connection with the lower endplate 20. Dislocation connection, the whole prosthesis is designed to prevent dislocation.

The connecting ball head 411 of the elastic connecting column 41 is embedded in the connecting groove 12 of the upper endplate 10. The elastic connecting device 40 can slide left and right along the connecting groove 12 and slightly slide back and forth. Sliding in all directions in the card slot is required to realize left-right and forward-backward sliding of the intervertebral disc prosthesis. The upper endplate 10 can freely rotate along the ellipsoidal surface of the nucleus pulposus 30 to achieve high mobility.

Except that the nucleus pulposus 30 of the present invention has honeycomb holes 311 to achieve a certain degree of elasticity, it mainly relies on the elastic member 33 to achieve elasticity, which can make the artificial intervertebral disc prosthesis deform under the action of force to offset part of the stress, wherein the elastic connection device 40 is also Elastic parts, the entire artificial intervertebral disc prosthesis is deformed under pressure or shear force, thereby increasing the life of the artificial intervertebral disc prosthesis, and can provide patients with a better postoperative experience, because the normal intervertebral disc itself is also elastic of.

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. In this embodiment, the upper surface of the upper endplate 10 and the lower surface of the lower endplate 20 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 structural composition of the prosthesis of the present invention includes an elastic connection device besides the upper endplate, nucleus pulposus, and lower endplate, which can prevent dislocation;

2. The nucleus pulposus of the present invention has an elastic design, which can make the prosthesis realize the elastic function, and the elastic connection device also has a certain elasticity, which is closer to human physiology;

3. The nucleus pulposus of the present invention can be spherical or ellipsoidal. The nucleus pulposus can move on the lower endplate without dislocation, and the upper endplate can rotate on the nucleus pulposus ellipsoid. Due to the elastic design of the nucleus pulposus and The surface design enables the prosthesis to obtain a higher range of motion;

4. The present invention has an elastic function, which can make the prosthesis counteract part of the stress to a certain extent, reduce the force of the prosthesis, and thus increase the life of the prosthesis.

The above 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 (10)

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); The 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 nucleus pulposus (30), and the top end of the elastic connection device (40) is connected to the upper endplate (10); The nucleus pulposus (30) is provided with a positioning column (34), the elastic connecting device (40) includes an elastic connecting column (41), and the bottom of the elastic connecting column (41) is provided with a positioning column ( 34) matching positioning groove (412); The top end of the elastic connection column (41) is provided with a connection ball head (411), the bottom of the upper end plate (10) is provided with a connection groove (12), and the connection ball head (411) is installed on the connection groove (12) to realize the free rotation and anti-off functions of the artificial intervertebral disc prosthesis; The elastic connection device (40) includes two elastic connection posts (41), and the two elastic connection posts (41) are symmetrically arranged on both sides of the nucleus pulposus (30). 2. The artificial intervertebral disc prosthesis according to claim 1, characterized in that, the top of the nucleus pulposus (30) is an ellipsoid (31), and the ellipsoid (31) is made of rubber material, The positioning part (11) is an ellipsoid socket adapted to the ellipsoid part (31). 3. The artificial intervertebral disc prosthesis according to claim 2, characterized in that at least one honeycomb hole (311) is provided on the ellipsoid (31), and the honeycomb hole (311) is parallel or inclined to the The upper endplate (10) is set. 4. The artificial intervertebral disc prosthesis according to claim 2, characterized in that, the nucleus pulposus (30) further comprises an elastic base (32), and the ellipsoid (31) is located on the elastic base (32) , the elastic base (32) is provided with a positioning outer flange (321) integrated with the elastic base (32), the limiting part (21) is a card slot, and the positioning outer flange (321 ) clearance fit in the slot. 5 . The artificial intervertebral disc prosthesis according to claim 4 , characterized in that, an elastic member ( 33 ) is arranged between the elastic base ( 32 ) and the ellipse ( 31 ). 6. The artificial intervertebral disc prosthesis according to claim 1, characterized in that, the opening width of the connection groove (12) is smaller than the diameter of the connection ball head (411). 7. The artificial intervertebral disc prosthesis according to claim 1, characterized in that, the connecting groove (12) is a straight groove, and the straight groove communicates with the positioning part (11). 8. The artificial intervertebral disc prosthesis according to claim 1, characterized in that, both the upper surface of the upper endplate (10) and the lower surface of the lower endplate (20) are provided with anti-rotation spines (50). 9. The artificial intervertebral disc prosthesis according to claim 8, characterized in that, the anti-rotation spine (50) is a triangular block or a quadrangular block. 10. The artificial intervertebral disc prosthesis according to any one of claims 1 to 9, characterized in that, both the upper surface of the upper endplate (10) and the lower surface of the lower endplate (20) are set as porous structure.