CN203280547U

CN203280547U - Artificial intervertebral disk

Info

Publication number: CN203280547U
Application number: CN2013202324858U
Authority: CN
Inventors: 寇万福; 董新华
Original assignee: Shandong Weigao Orthopedic Materials Co Ltd
Current assignee: Beijing Prestige Francis Koo Artificial Joint Development Corp Ltd
Priority date: 2013-05-02
Filing date: 2013-05-02
Publication date: 2013-11-13
Anticipated expiration: 2023-05-02

Abstract

The utility model discloses an artificial intervertebral disk which comprises an upper end plate, a lower end plate and a nucleus pulposus. The nucleus pulposus comprises a core body, a middle layer and an outer layer, wherein the core body, the middle layer and the outer layer are sequentially arranged from interior to exterior, the core body is spherical, and the core body is covered by the middle layer. The middle layer is sleeved with the outer layer, the elasticity modulus of the core body, the elasticity modulus of the middle layer and the elasticity modulus of the outer layer are sequentially decreased, and the nucleus pulposus is bonded with the upper end plate and the lower end plate. The artificial intervertebral disk can be closer to the physiological movement track of the human intervertebral disk, and meanwhile the abrasion of the nucleus pulposus is reduced.

Description

Artificial intervertebral disk

Technical field

This utility model relates to a kind of prosthese, relates to specifically a kind of prosthese for spine.

Background technology

artificial intervertebral disk commonly used is divided into two classes, comprise ball-and-socket joint type intervertebral disc and elastomeric intervertebral disc, wherein ball-and-socket joint type intervertebral disc has very high rigidity in vertical direction, lack the ability of nature compression and can not immediately rotate as natural lamina, elastomeric intervertebral disc is absorbing vibration and bear load in vertical direction, but because the elasticity of its vertebral pulp each several part is identical, therefore the proper motion track of its movement locus and human vertebra differs greatly, human body has foreign body sensation, and vertebral pulp and upper, lower soleplate is split-type structural, complex structure, in use, the granule that the vertebral pulp wearing and tearing produce has the risk of bringing out inflammation.

The utility model content

The purpose of this utility model is to provide a kind of artificial intervertebral disk, its can be more near the physiological movement track of human intervertebral disc, and reduce the wearing and tearing of vertebral pulp.

To achieve these goals, technical solution of the present utility model is: a kind of artificial intervertebral disk, comprise upper and lower soleplate and vertebral pulp, described vertebral pulp comprises core body, intermediate layer and the skin that sets gradually from inside to outside, core body is spherical, and intermediate layer wraps in outside core body, and skin is enclosed within outside intermediate layer, core body, intermediate layer, outer field elastic modelling quantity reduce successively, mutually bond between vertebral pulp and upper and lower soleplate.

This utility model artificial intervertebral disk, wherein, described vertebral pulp is made by polyurethane material.

This utility model artificial intervertebral disk, wherein, bond by hydrogel between described vertebral pulp and upper and lower soleplate mutually.

This utility model artificial intervertebral disk, wherein, described upper and lower endplate surface is equipped with particulate matter, and the diameter of particulate matter is 250-500 μ m.

This utility model artificial intervertebral disk, wherein, the number of plies of described particulate matter is three layers or four layers, the gross thickness of particulate matter is in 1mm.

This utility model artificial intervertebral disk, wherein, the position of described core body is corresponding with the position of the center of rotation of human intervertebral disc vertebral pulp.

After adopting such scheme, this utility model artificial intervertebral disk is integrated due to vertebral pulp and upper and lower soleplate, therefore reduce the wearing and tearing of vertebral pulp, reduction causes the risk of inflammation because of the vertebral pulp granule, and core body, intermediate layer, outer field elastic modelling quantity reduce successively, the nucleus pulposus characteristic of this vertebral pulp and human body self is more approaching, and its motor process, more near the physiological movement track of human body self intervertebral disc, reduces the foreign body sensation of human body.

In addition, form loose structure between the particulate matter of upper and lower endplate surface, the stable and long-term bone of initial stage that is conducive to artificial intervertebral disk is grown into, and increases biological stability; The position of the center of rotation of the position of core body and human body self nucleus pulposus is corresponding, makes the movement locus of artificial intervertebral disk more meet the movement locus of human body self intervertebral disc.

Illustrate this utility model artificial intervertebral disk below in conjunction with accompanying drawing.

Description of drawings

Fig. 1 is that the master of this utility model artificial intervertebral disk looks cutaway view;

Fig. 2 is that cutaway view is looked on the right side of this utility model artificial intervertebral disk;

Fig. 3 is that the A-A of Fig. 1 is to cutaway view.

The specific embodiment

as Fig. 1, shown in 2, this utility model artificial intervertebral disk, comprise,

lower soleplate

11, 13 and vertebral pulp 15, vertebral pulp 15 is variable elastic body material, it comprises the core body 151 that sets gradually from inside to outside, intermediate layer 153 and outer 155, core body 151 is spherical, intermediate layer 153 wraps in outside core body 151, outer 155 are enclosed within outside intermediate layer 153, core body 151, intermediate layer 153, outer 155 elastic modelling quantity reduces successively, vertebral pulp 15 can be selected the elastomeric material of polyurethane material or other human implantables, vertebral pulp 15 is with upper, lower soleplate 11, mutually bond by hydrogel or other binding agents between 13.

Upper and

lower soleplate

11,13 can be selected titanium plate or titanium alloy sheet, upper and

lower soleplate

11,13 surfaces are provided with particulate matter 111,131 by the method for sintering or plasma spraying, the diameter of particulate matter is 250-500 μ m, the number of plies of particulate matter is three layers or four layers, the gross thickness of particulate matter is in 1mm, form loose structure between particulate matter, the mean porosities on upper and

lower soleplate

11,13 surfaces is more than 45%.

As shown in Figure 1, 2, 3, the geometric center of the position deviation artificial intervertebral disk of core body 151, but corresponding with the position of the center of rotation of human body self nucleus pulposus.

during use, by performing the operation between two vertebras of this utility model artificial intervertebral disk implant into body, on, the particulate matter of lower endplate surface embeds in human vertebrae, due to vertebral pulp 15 and upper,

lower soleplate

11, 13 are bonded as one, therefore reduce the wearing and tearing of vertebral pulp, reduction causes the risk of inflammation because of the vertebral pulp granule, and core body 151, intermediate layer 153, outer 155 elastic modelling quantity reduces successively, the nucleus pulposus characteristic of this vertebral pulp and human body self is more approaching, its motor process is more near the physiological movement track of human body self intervertebral disc, reduce the foreign body sensation of human body, on, lower soleplate 11, form loose structure between the particulate matter on 13 surfaces, stable and the long-term bone of initial stage that is conducive to artificial intervertebral disk is grown into, increase biological stability.

The above embodiment is described preferred implementation of the present utility model; not scope of the present utility model is limited; under the prerequisite that does not break away from this utility model design spirit; various distortion and improvement that the common engineers and technicians in this area make the technical solution of the utility model, all should fall in the definite protection domain of claims of the present utility model.

Claims

1. artificial intervertebral disk, comprise upper and lower soleplate (11,13) and vertebral pulp (15), it is characterized in that: described vertebral pulp (15) comprises core body (151), intermediate layer (153) and outer (155) that set gradually from inside to outside, core body (151) is spherical, intermediate layer (153) wraps in outside core body (151), outer (155) are enclosed within outside intermediate layer (153), the elastic modelling quantity of core body (151), intermediate layer (153), outer (155) reduces successively, mutually bonds between vertebral pulp (15) and upper and lower soleplate (11,13).

2. artificial intervertebral disk as claimed in claim 1, it is characterized in that: described vertebral pulp (15) is made by polyurethane material.

3. artificial intervertebral disk as claimed in claim 2, it is characterized in that: described vertebral pulp (15) and upper and lower soleplate bond mutually by hydrogel between (11,13).

4. artificial intervertebral disk as claimed in claim 3, it is characterized in that: described upper and lower soleplate (11,13) surface is equipped with particulate matter (111,131), and the diameter of particulate matter (111,131) is 250-500 μ m.

5. artificial intervertebral disk as claimed in claim 4, it is characterized in that: the number of plies of described particulate matter (111,131) is three layers or four layers, and the gross thickness of particulate matter is in 1mm.

6. artificial intervertebral disk as claimed in claim 5, it is characterized in that: the position of described core body (151) is corresponding with the position of the center of rotation of human intervertebral disc vertebral pulp.