CN102727329B - Artificial cervical intervertebral disc - Google Patents

Abstract

The invention relates to an artificial cervical intervertebral disc, comprising: an upper base plate, a lower base plate and a nucleus pulposus arranged between the two, wherein the nucleus pulposus is composed of an upper nucleus pulposus with a protruding post interlocked together and a protruding post for nesting The lower nucleus pulposus is composed of the arc-shaped dovetail groove; the upper base plate cooperates with the upper nucleus pulposus and rotates around the coronal axis to simulate the flexion and extension function of the cervical intervertebral disc, allowing the upper base plate and the upper nucleus pulposus to move slightly forward and backward; The nucleus pulposus cooperates with the lower nucleus pulposus, which can not only rotate around the rotation axis of the convex column of the upper nucleus pulposus, but also revolve around the rotation track of the arc-shaped dovetail groove of the lower nucleus pulposus; the lower nucleus pulposus cooperates with the lower base plate, and revolves around the sagittal axis Rotate, bear the motor functions of left and right bending, allow the lower base plate and the lower nucleus pulposus to be relatively slightly translated in the left and right directions. The cervical intervertebral disc prosthesis allows its different components to move with each other, and the rotation center during the movement coincides with the rotation center of the cervical segmental physiological movement, so as to restore the natural physiological state of the cervical spine to the greatest extent.

Description

artificial cervical disc

technical field

The invention relates to a prosthesis implanted into a human body, in particular to an artificial cervical intervertebral disc used to replace a diseased intervertebral disc in the cervical spine to decompress the cervical intervertebral space, maintain the height of the cervical intervertebral space and restore its normal physiological function.

Background technique

CN 201010003132.1 discloses "an artificial intervertebral disc of the cervical spine". Its purpose is to provide a simple structure and adopt a three-in-one structure, so that the prosthesis has a three-dimensional six-degree-of-freedom space range of rotation, flexion and extension, and translation, which meets the requirements of normal human body. The movement function of the cervical vertebra solves the problem of the cervical artificial intervertebral disc in the prior art. The technical scheme comprises: an upper endplate, a lower endplate, and a wear-resistant nucleus pulposus arranged between the upper endplate and the lower endplate, the nucleus pulposus comprises a circular intermediate body, and is located at the circumference of the intermediate body. The ring-shaped upper and lower endplate stoppers concentric with the middle body, the built-in ball-and-socket joints inside the middle body, and the built-in ball-and-socket joints are arranged at the center of the upper and lower two nucleus pulposus moving surfaces of the middle body. The entrance of the interlinked blocking head; a circular upper arc-shaped groove is arranged on the inner surface of the upper end plate, and an upper column is arranged at the center of the upper arc-shaped groove, and an upper blocking head is arranged at the outer end of the upper column; There is a circular lower arc groove on the inner side of the plate, a lower column is arranged at the center of the lower arc groove, and a lower blocking head is arranged at the outer end of the lower column; the upper blocking head and the lower blocking head pass through the upper and lower blocking heads respectively. The entrance of the blocking head at the center of the moving surface of the lower two nuclei is snapped into the built-in ball and socket joint; several dislocation-preventing fixed teeth are respectively provided on the outer surfaces of the upper endplate and the lower endplate. Its disadvantages are: the position of the nucleus pulposus of the cervical intervertebral disc is variable during the relative motion of the cervical segment, that is, it can provide an instantaneously variable center of rotation. However, the center of rotation of the above-mentioned prosthesis is fixed, so it does not meet the requirement of the human body as a living surface to make the position of the nucleus pulposus changeable.

Contents of the invention

The object of the present invention is to provide a prosthesis that allows its different components to move with each other, and the rotation center during the movement is consistent with the rotation center of the cervical segmental physiological movement, so as to restore the cervical intervertebral disc in the natural physiological state of the cervical spine to the greatest extent Prosthesis.

The technical solution of the present invention is that the artificial cervical intervertebral disc includes an upper base plate, a lower base plate, and a nucleus pulposus arranged between the upper base plate and the lower base plate. The upper nucleus pulposus with convex posts and the lower nucleus pulposus with arc-shaped dovetail grooves for the convex posts to nest; the upper base plate cooperates with the upper nucleus pulposus and rotates around the coronal axis, simulating the flexion and rearward flexion of the cervical intervertebral disc stretching function, and allow the relative micro-translation of the upper base plate and the upper nucleus pulposus in the front-back direction; The rotation track of the arc-shaped dovetail groove of the lower nucleus pulposus revolves, so that the instantaneously variable vertical axis rotation axis is consistent with the physiological state of the cervical intervertebral disc, and the prosthesis is restricted from protruding from the vertical axis; the lower nucleus pulposus and the lower nucleus pulposus The base plate cooperates, rotates around the sagittal axis, undertakes the motion function of left and right bending, and allows the relative micro-translation of the lower base plate and the lower nucleus pulposus in the left and right directions; the artificial cervical intervertebral disc conforms to the physiological characteristics of the cervical intervertebral disc. The initial anteversion angle is 5°; the upper base plate and the lower base plate can cooperate with the upper nucleus pulposus and the lower nucleus pulposus of different height series to meet the anatomical characteristics of cervical intervertebral discs of different races.

As a preference: the upper nucleus pulposus is formed from the upper arc-shaped convex surface, the lower plane, and the two sides of the lower vertebral body, where the rotation axis is parallel to the coronal axis, and the longitudinal sides along the axial direction of the upper arc-shaped surface from the lower plane are respectively recessed and connected to the upper The arc-shaped track fitted by the arc-shaped groove of the bottom plate is matched to limit the prosthesis from protruding from the vertical axis. The dovetail groove is matched with the protruding post that restricts the prosthesis from the vertical axis; the arc-shaped wing gap grooves provided at the front and rear ends of the upper nucleus pulposus and the arc-shaped grooves at the front and rear ends of the arc-shaped groove of the upper base plate Orbital fit to limit prosthesis dislodgement from vertical axis.

As a preference: the radius of the upper arc-shaped convex surface of the upper nucleus pulposus is equal to or slightly smaller than the radius of the arc-shaped groove of the upper floor.

As a preference: the lower nucleus pulposus is formed from the upper plane, the rotation axis is parallel to the sagittal axis and is located on the lower arc-shaped surface of the upper vertebral body, and the central part of the upper plane is recessed along the radial direction with an arc-shaped dovetail groove whose rotation center is located at the posterior column of the spine The first and second end faces are formed by recessing from the upper plane to the lower arc-shaped surface to form a slot with arc-shaped wings.

As a preference: the radius of the lower arc-shaped surface of the lower nucleus pulposus is equal to or slightly smaller than the radius of the arc-shaped groove of the lower floor.

As a preference: the upper bottom plate is provided with an arc-shaped groove whose rotation axis is parallel to the coronal axis and located at the lower vertebral body by the plate body and the lower surface of the plate body. The left and right ends of the arc-shaped groove are respectively recessed for the left side of the upper nucleus pulposus. , the right two ends are provided with the arc-shaped wings of the slot to cooperate with the arc-shaped track to limit the prosthesis from the vertical axis, the arc-shaped serrated surface set on the front end of the upper surface of the plate body, and the arc-shaped serrated surface set on the rear end of the upper surface of the plate body. The provided curved serrated surface and the plane in the middle of the upper surface of the upper base plate are formed.

As a preference: the sawtooth direction of the front arc-shaped sawtooth surface faces backwards, while the sawtooth direction of the rear-end arc-shaped sawtooth surface faces forward, which cooperates with the lower surface of the upper vertebral body of the cervical spine and is placed on the neck of the head and neck. Under the action of gravity, the serrated surface on the upper surface of the upper base plate forms self-locking and positioning with the lower surface of the upper vertebral body.

Preferably: the surface of the plane is sprayed with titanium powder and hydroxyapatite for promoting bone ingrowth and fixing.

As a preference: the lower bottom plate is formed by the plate body, the upper surface of the plate body is concavely provided with an arc-shaped groove whose rotation axis is parallel to the sagittal axis and is located in the upper vertebral body, and the longitudinal sides of the arc-shaped groove along the axial direction are respectively recessed with an arc The two ends of the arc-shaped track and the arc-shaped groove are protruded along the radial direction, and the arc-shaped wings formed by the gaps at the front and rear ends of the lower nucleus pulposus are respectively arranged to cooperate with each other to limit the prosthesis from the vertical axis. The protruding buckle and the lower surface of the plate body are composed of a plurality of inverted teeth protruding.

Another technical solution of the present invention is that the artificial cervical intervertebral disc includes an upper base plate, a lower base plate, and a nucleus pulposus arranged between the upper base plate and the lower base plate. Together, the upper nucleus pulposus with convex posts and the lower nucleus pulposus of the arc-shaped dovetail groove for the convex posts to nest; the upper base plate cooperates with the upper nucleus pulposus and rotates around the coronal axis to simulate the front of the cervical intervertebral disc. Flexion and extension function, and allow relative micro-translation in the front-back direction of the upper base plate and the upper nucleus pulposus; the upper nucleus pulposus cooperates with the lower nucleus pulposus, which can not only rotate around the rotation axis of the convex column of the upper nucleus pulposus itself, but also Revolving around the rotation track of the arc-shaped dovetail groove of the lower nucleus pulposus, so that the instantaneously variable vertical axis rotation axis conforms to the physiological state of the cervical intervertebral disc, and limits the prosthesis from protruding from the vertical axis; the lower nucleus pulposus and the lower nucleus pulposus Cooperate with the lower base plate, rotate around the sagittal axis, and undertake the motor function of lateral bending; the initial anteversion angle of the artificial cervical intervertebral disc that is consistent with the physiological characteristics of the cervical intervertebral disc is 5°; the upper base plate and the lower base plate can be different from A high-level series of upper nucleus pulposus and lower nucleus pulposus are combined to meet the anatomical characteristics of cervical intervertebral discs of different races; the upper nucleus pulposus is formed by the upper arc-shaped convex surface and the lower plane of the lower vertebral body where the rotation axis is parallel to the coronal axis The two sides are concave from the lower plane to the upward arc-shaped surface with a slot with arc-shaped wings, and the lower plane is located in the central part to protrude and set a round platform that coincides with the physiological rotation center of the cervical intervertebral disc; the front of the upper nucleus pulposus 1. The arc-shaped wing gap grooves arranged at the rear two ends cooperate with the arc-shaped tracks at the front and rear ends of the concave surface groove of the upper base plate to limit the prosthesis from protruding from the vertical axis; the radius of the upper arc-shaped convex surface of the upper nucleus pulposus platform Equal to or slightly smaller than the radius of the arc-shaped groove of the upper floor; the lower nucleus pulposus is located on the lower arc-shaped surface of the upper vertebral body, and the central part of the upper plane is radially recessed from the upper plane, the axis of rotation is parallel to the sagittal axis, and the center of rotation is recessed The arc-shaped dovetail groove located in the posterior column of the spine, and the two end surfaces are respectively recessed from the upper plane to the downward arc-shaped surface to form a groove with arc-shaped wings; the radius of the lower arc-shaped surface of the lower nucleus pulposus is equal to or slightly smaller than that of the lower base plate The radius of the arc-shaped groove; the upper bottom plate is formed by the plate body, the lower surface of the plate body, and the arc-shaped groove with a concave rotation axis parallel to the coronal axis and located at the lower vertebral body, and the front and rear ends of the upper surface of the plate body The arc-shaped serrated surface and the plane in the middle of the upper surface of the upper base plate; the serrated direction of the serrated surface of the front-end arc-shaped serrated surface faces backward, while the serrated direction of the serrated surface of the rear-end arc-shaped serrated surface faces forward, and is in line with the upper vertebra of the cervical spine. Under the action of the gravity of the head and neck, the serrated surface on the upper surface of the upper floor forms self-locking and positioning with the lower surface of the upper vertebral body; the surface of the plane is sprayed with titanium powder that promotes bone growth and fixation and hydroxyapatite; the lower floor consists of a plate body, and the upper surface of the plate body is concavely provided with an arc-shaped groove whose rotation axis is parallel to the sagittal axis and located in the upper vertebral body, and the longitudinal sides of the arc-shaped groove along the axial direction are respectively Concave arc-shaped track, the two ends of the arc-shaped groove along the radial transverse side respectively protrude along the axial direction and the arc-shaped wings formed by the front and rear ends of the lower nucleus pulposus are provided with gaps to cooperate to limit the prosthesis from It is composed of buckles that come out vertically and axially, and a number of inverted teeth protruding from the lower surface of the plate body.

Compared with prior art, the advantages of the present invention:

1. The temporary fixation method adopts: the contact surface between the upper base plate and the lower surface of the upper vertebral body is provided with an arc-shaped serrated surface, and the contact surface between the lower base plate and the upper surface of the lower vertebral body is provided with a number of inverted teeth. Minimize the damage to the vertebral body, prevent the long-term subsidence of the cervical intervertebral disc prosthesis, and can meet the requirements of double-segment or even multi-segment cervical intervertebral disc replacement.

2. It provides three rotation axes perpendicular to each other, and can provide an instantaneous rotation center in line with the natural physiological state in the state of cervical flexion, lateral bending, and rotation, and the three articular surfaces allow subtle translation , The natural physiological state of the human cervical spine is restored to the greatest extent.

Description of drawings

Fig. 1 is a schematic exploded view of the structure of the artificial cervical intervertebral disc of the present invention.

Fig. 2 is a schematic diagram of the structural assembly of the artificial cervical intervertebral disc of the present invention.

Fig. 3 is a cross-sectional view of the structure of the artificial cervical intervertebral disc of the present invention.

Fig. 4 is a schematic structural view of the upper base plate of the present invention.

FIG. 5 is a side view of FIG. 4 .

FIG. 6 is a sectional view of FIG. 4 .

Fig. 7 is a schematic structural view of the lower base plate of the present invention.

FIG. 8 is a side view of FIG. 7 .

FIG. 9 is a sectional view of FIG. 7 .

Fig. 10 is a schematic structural view of the upper nucleus pulposus of the present invention.

FIG. 11 is a side view of FIG. 10 .

FIG. 12 is a sectional view of FIG. 10 .

Fig. 13 is a schematic structural view of the lower nucleus pulposus of the present invention.

FIG. 14 is a side view of FIG. 13 .

FIG. 15 is a sectional view of FIG. 13 .

Fig. 16 is a schematic diagram of human body coordinate axes.

Description of main component symbols:

Upper base plate 1, plate body 11, arc-shaped groove 12, arc-shaped track 121, front end arc-shaped sawtooth surface 13, rear end arc-shaped saw-tooth surface 14, plane 15, lower base plate 2, plate body 21, arc-shaped groove 22, L-shaped arc track 23, buckle 221, inverted tooth 24, nucleus pulposus 3, upper nucleus pulposus 31, convex post 311, upper arc-shaped convex surface 312, lower plane 313, arc-shaped wing defect groove 314, lower nucleus pulposus 32, The upper plane 321, the arc-shaped dovetail groove 3211, the lower arc-shaped surface 322, the slot 323, and the arc-shaped wing 3231.

Detailed ways

The present invention will be described in further detail below in conjunction with accompanying drawing:

See also Fig. 1, Fig. 2, Fig. 3, shown in Fig. 16, described artificial cervical intervertebral disc, comprises upper base plate 1, lower base plate 2 and is located at the nucleus pulposus 3 between upper base plate 1 and lower base plate 2, described pulp The nucleus is composed of an upper nucleus pulposus 31 with a protruding post 311 and a lower nucleus pulposus 32 with an arc-shaped dovetail groove 3211 for nesting of the protruding posts 311 that are fastened together; the upper base plate 1 and the upper nucleus pulposus 31, rotate around the coronal axis, simulate the flexion and extension function of the cervical intervertebral disc, and allow the relative micro-translation of the upper base plate 1 and the upper nucleus pulposus 31 in the anteroposterior direction; the upper nucleus pulposus 31 cooperates with the lower nucleus pulposus 31 , it can not only rotate around the rotation axis of the convex post 311 of the upper nucleus pulposus 31, but also revolve around the rotation track of the arc-shaped dovetail groove 3211 of the lower nucleus pulposus 32, so that the instantaneously variable vertical axis rotation axis and the cervical intervertebral disc The physiological state is consistent, and the prosthesis is restricted from protruding from the vertical axis; the lower nucleus pulposus 32 cooperates with the lower base plate 2, rotates around the sagittal axis, undertakes the motion function of left and right bending, and allows the lower base plate 2 and The lower nucleus pulposus 32 undergoes relative micro-translation in the left and right directions; the initial anteversion angle of the artificial cervical intervertebral disc that matches the physiological characteristics of the cervical intervertebral disc is 5°; The upper nucleus pulposus 31 and the lower nucleus pulposus 32 cooperate to meet the anatomical characteristics of cervical intervertebral discs of different races.

Please refer to Fig. 4, Fig. 5, Fig. 6, and Fig. 16, the upper base plate 1 is provided with a plate body 11 and a concave bottom surface of the plate body with a rotation axis parallel to the coronal axis and located at the lower vertebral body (not shown). The arc groove 12, the left and right ends of the arc groove 12 are respectively recessed for the left and right ends of the upper nucleus pulposus 31 to be provided with the arc wings of the missing groove 314 to cooperate to limit the prosthesis from the vertical axis. The curved track 121, the arc serrated surface 13 set on the front end of the upper surface of the plate body 11, the arc serrated surface 14 set on the rear end of the upper surface of the plate body 11, and the plane 15 in the middle of the upper surface of the upper base plate 11. The sawtooth direction of the front end arc-shaped sawtooth surface 13 faces backward, while the sawtooth direction of the rear-end arc-shaped sawtooth surface 14 faces forward, matching with the lower surface of the upper cervical vertebral body (not shown in the figure), Under the action of gravity of the head and neck, the serrated surface on the upper surface of the upper base plate 1 forms self-locking and positioning with the lower surface of the upper vertebral body (not shown in the figure). The surface of the plane 15 is sprayed with bone ingrowth-promoting and fixed titanium powder and hydroxyapatite.

Please refer to Fig. 7, Fig. 8, Fig. 9, and Fig. 16, the lower base plate 2 is provided with a plate body 21, and the upper surface of the plate body is concavely provided with a rotation axis parallel to the sagittal axis and located at the upper vertebral body (not shown in the figure). The arc groove 22 of the arc groove 22, the vertical side along the axial direction of the arc groove 22 is respectively concavely provided with the arc track 23, and the two ends of the arc groove 22 are respectively convexly provided along the axial direction and the lower marrow along the radial horizontal side. The front and rear ends of the nucleus 32 are formed by arc-shaped wings formed by gaps to cooperate with the buckle 221 to limit the prosthesis from coming out from the vertical axis, and the lower surface of the plate body 21 is composed of a number of inverted teeth 24 protruding.

Please refer to Fig. 10, Fig. 11, Fig. 12, and Fig. 16, the upper nucleus pulposus 31 consists of an upper arc-shaped convex surface 312 and a lower plane 313 whose rotation axis is parallel to the coronal axis and located in the lower vertebral body (not shown in the figure). 2. The arc-shaped track 121 matching the arc-shaped groove 12 of the upper bottom plate 1 is respectively recessed on the two sides from the lower plane 313 to the upward arc-shaped surface 312 along the longitudinal direction of the axial direction, so as to limit the arc that the prosthesis protrudes from the vertical axis. Shaped wing gap 314 and lower plane 313 are located in the central part and protrude to coincide with the physiological rotation center of the cervical intervertebral disc and cooperate with the arc-shaped dovetail groove 3211 of the lower nucleus pulposus 32 to limit the prosthesis from protruding from the vertical axis. The arc-shaped wing slots 314 provided at the front and rear ends of the upper nucleus pulposus 31 cooperate with the arc-shaped tracks 121 at the front and rear ends of the upper base plate arc-shaped groove 12 to limit the prosthesis from protruding from the vertical axis. The radius of the arc-shaped convex surface 312 of the upper nucleus pulposus 31 is equal to or slightly smaller than the radius of the arc-shaped groove 12 of the upper floor.

Please refer to Fig. 13, Fig. 14, Fig. 15, and Fig. 16, the lower nucleus pulposus 32 consists of an upper plane 321, the rotation axis is parallel to the sagittal axis and is located on the lower arcuate surface of the upper vertebral body (not shown in the figure). 322. The central part of the upper plane 321 is recessed along the radial direction. The center of rotation is located in the arc-shaped dovetail groove 3211 of the posterior column of the spine (not shown in the figure). The slot 323 of the wing 3231 is formed. The radius of the lower arc-shaped surface 322 of the lower nucleus pulposus is equal to or slightly smaller than the radius of the arc-shaped groove 22 of the lower floor. The boss 311 on the lower surface of the upper nucleus pulposus 31 cooperates with the arc-shaped dovetail groove 3211 on the upper surface of the lower nucleus pulposus 32 to limit the prosthesis from protruding from the vertical axis.

Working principle: The present invention adopts the above four components, namely the upper base plate 1, the upper nucleus pulposus 31, the lower nucleus pulposus 32, and the lower base plate 2, which are connected by three articular surfaces to form a relatively stable cervical intervertebral disc prosthesis, wherein the upper base plate 1 The rotation axis of the articular surface formed by the upper nucleus pulposus 31 is parallel to the coronal axis and located in the lower vertebral body, the rotation axis of the articular surface formed by the upper nucleus pulposus 31 and the lower nucleus pulposus 32 is parallel to the vertical axis and located in the posterior column of the spine, The rotation axis of the articular surface formed by the lower base plate 2 and the lower nucleus pulposus 32 is parallel to the sagittal axis and located in the upper vertebral body, so that the artificial cervical intervertebral disc can provide the natural physiological state in the state of cervical flexion, extension, lateral bending, and rotation. The instantaneous rotation center restores the natural physiological state of the human cervical spine to the greatest extent.

The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the scope of the claims of the present invention shall fall within the scope of the claims of the present invention.

Claims (10)

1. An artificial cervical intervertebral disc, comprising an upper base plate, a lower base plate and a nucleus pulposus located between the upper base plate and the lower base plate, characterized in that: the nucleus pulposus is formed by the upper nucleus pulposus of the band convex column that is fastened together It is composed of the lower nucleus pulposus of the arc-shaped dovetail groove for the nesting of the convex post; the upper base plate cooperates with the upper nucleus pulposus and rotates around the coronal axis to simulate the flexion and extension function of the cervical intervertebral disc and allow the upper base plate The relative micro-translation in the front-back direction occurs with the upper nucleus pulposus; the upper nucleus pulposus cooperates with the lower nucleus pulposus, which can not only rotate around the rotation axis of the upper nucleus pulposus itself, but also circle the arc of the lower nucleus pulposus The rotation trajectory of the dovetail slot revolves, making the instantaneously variable vertical axis of rotation consistent with the physiological state of the cervical intervertebral disc, limiting the prosthesis from protruding from the vertical axis; the lower nucleus pulposus cooperates with the lower base plate, Rotate, undertake the motion function of left and right bending, and allow the relative micro-translation of the lower base plate and the lower nucleus pulposus in the left and right directions; the initial anteversion angle of the artificial cervical intervertebral disc is 5°, which is consistent with the physiological characteristics of the cervical intervertebral disc; The upper base plate and the lower base plate can cooperate with the upper nucleus pulposus and the lower nucleus pulposus of different height series to meet the anatomical characteristics of cervical intervertebral discs of different races. 2. The artificial cervical intervertebral disc according to claim 1, characterized in that: the upper nucleus pulposus is parallel to the coronal axis by the rotation axis and the upper arc-shaped convex surface, the lower plane, and the two sides of the lower vertebral body are arced upward from the lower plane. The longitudinal sides of the convex surface along the axial direction are respectively recessed with the arc-shaped track matching the arc-shaped groove of the upper base plate to limit the prosthesis from protruding from the vertical axis. The physiological rotation center of the intervertebral disc coincides with the convex column that cooperates with the arc-shaped dovetail groove of the lower nucleus pulposus to limit the prosthesis from protruding from the vertical axis; The arc-shaped track of the arc-shaped groove on the upper bottom plate cooperates to limit the prosthesis from coming out from the vertical axis. 3. The artificial cervical intervertebral disc according to claim 2, characterized in that: the radius of the arc-shaped convex surface of the upper nucleus pulposus is equal to or slightly smaller than the radius of the arc-shaped groove of the upper floor. 4. The artificial cervical intervertebral disc according to claim 1, characterized in that: the lower nucleus pulposus is located in the lower arc-shaped surface of the upper vertebral body and the central part of the upper plane along the radial direction from the upper plane, the axis of rotation is parallel to the sagittal axis The center of rotation is concavely located in the arc-shaped dovetail groove of the posterior column of the spine, and the two end surfaces along the axial direction are respectively recessed radially from the upper plane to the downward arc-shaped surface to form arc-shaped wing slots. 5. The artificial cervical intervertebral disc according to claim 4, wherein the radius of the arcuate surface of the lower nucleus pulposus is equal to or slightly smaller than the radius of the arcuate groove of the lower floor. 6. The artificial cervical intervertebral disc according to claim 1, characterized in that: the upper base plate is formed by the plate body, the lower surface of the plate body is concavely provided with an arc-shaped groove parallel to the coronal axis and located at the lower vertebral body, along the edge of the arc-shaped groove. The longitudinal sides in the axial direction are respectively recessed for the arc-shaped wing slots recessed in the upper nucleus pulposus along the longitudinal longitudinal sides in the axial direction to cooperate with the arc-shaped track for restricting the prosthesis from protruding from the vertical axis, and the front end of the upper surface of the plate body. The curved sawtooth surface, the curved sawtooth surface provided on the rear end of the upper surface of the board body, and the plane in the middle of the upper surface of the upper bottom plate are composed. 7. The artificial cervical intervertebral disc according to claim 6, characterized in that: the sawtooth direction of the front end arc-shaped sawtooth surface faces backward, while the sawtooth direction of the rear end arc-shaped sawtooth surface faces forward, and is in line with the cervical vertebrae. The lower surface of the upper vertebral body cooperates, and under the gravity of the head and neck, the serrated surface on the upper surface of the upper base plate forms a self-locking and positioning with the lower surface of the upper vertebral body. 8. The artificial cervical intervertebral disc according to claim 6, characterized in that: the surface of the plane is sprayed with titanium powder and hydroxyapatite to promote bone ingrowth and fixation. 9. The artificial cervical intervertebral disc according to claim 1, characterized in that: the lower base plate is formed by the plate body, and the upper surface of the plate body is concavely provided with an arc-shaped groove and an arc-shaped groove whose rotation axis is parallel to the sagittal axis and located in the upper vertebral body. The longitudinal sides of the groove along the axial direction are respectively concavely provided with arc-shaped tracks, the two ends of the arc-shaped groove along the radial direction of the horizontal sides are respectively protruded along the axial direction, and the front and rear ends of the lower nucleus pulposus are provided with slots. The arc-shaped wings cooperate to limit the buckle of the prosthesis from the vertical axis, and the lower surface of the plate body is composed of several inverted teeth. 10. An artificial cervical intervertebral disc, comprising an upper base plate, a lower base plate, and a nucleus pulposus arranged between the upper base plate and the lower base plate, characterized in that: the nucleus pulposus is formed of upper nucleus pulposus with protruding posts that are fastened together It is composed of the lower nucleus pulposus of the arc-shaped dovetail groove for the nesting of the convex post; the upper base plate cooperates with the upper nucleus pulposus and rotates around the coronal axis to simulate the flexion and extension function of the cervical intervertebral disc and allow the upper base plate The relative micro-translation in the front-back direction occurs with the upper nucleus pulposus; the upper nucleus pulposus cooperates with the lower nucleus pulposus, which can not only rotate around the rotation axis of the upper nucleus pulposus itself, but also circle the arc of the lower nucleus pulposus The rotation trajectory of the dovetail slot revolves, making the instantaneously variable vertical axis of rotation consistent with the physiological state of the cervical intervertebral disc, limiting the prosthesis from protruding from the vertical axis; the lower nucleus pulposus cooperates with the lower base plate, Rotate, bear the motor function of left and right side bending; the initial anteversion angle of the artificial cervical intervertebral disc that matches the physiological characteristics of the cervical intervertebral disc is 5°; the upper base plate and the lower base plate can be combined with the upper nucleus pulposus and lower spinal cord Nucleus matching to meet the anatomical characteristics of cervical intervertebral discs of different races; The upper nucleus pulposus consists of an arc-shaped convex surface, a lower plane, and two sides that are located on the lower vertebral body with the axis of rotation parallel to the coronal axis. The groove and the lower plane are located in the central part, and the convex column coincides with the physiological rotation center of the cervical intervertebral disc; Orbital fit to limit the prosthesis from protruding from the vertical axis; The radius of the arc-shaped convex surface of the upper nucleus pulposus is equal to or slightly smaller than the radius of the arc-shaped groove of the upper floor; The lower nucleus pulposus consists of an upper plane, a rotation axis parallel to the sagittal axis and located on the lower arc-shaped surface of the upper vertebral body, an arc-shaped dovetail groove with a rotation center located in the posterior column of the spine radially recessed in the central part of the upper plane, and an arc-shaped dovetail groove along the axis The two end surfaces facing each other are formed by radially recessing from the upper plane to the downward arc surface to form a slot with arc wings; The radius of the lower arc-shaped surface of the lower nucleus pulposus is equal to or slightly smaller than the radius of the arc-shaped groove of the lower floor; The upper bottom plate is formed by the plate body, the lower surface of the plate body is concavely provided with an arc-shaped groove whose rotation axis is parallel to the coronal axis and is located at the lower vertebral body, the arc-shaped serrated surface provided at the front and rear ends of the upper surface of the plate body, and the upper bottom plate The plane composition in the middle of the upper surface; The sawtooth direction of the curved sawtooth surface of the front end faces backward, while the sawtooth direction of the rear curved sawtooth surface faces forward, which cooperates with the lower surface of the upper vertebral body of the cervical spine, and under the gravity of the head and neck , the serrated surface on the upper surface of the upper floor forms self-locking and positioning with the lower surface of the upper vertebral body; The surface of the plane is sprayed with titanium powder and hydroxyapatite to promote bone ingrowth and fixation; The lower bottom plate is formed by the plate body, the upper surface of the plate body is concavely provided with an arc-shaped groove whose rotation axis is parallel to the sagittal axis and is located at the upper vertebral body, and the longitudinal sides of the arc-shaped groove along the axial direction are respectively recessed with an arc-shaped track, The two ends of the arc-shaped groove are protruding along the radial direction and the transverse sides are respectively axially protruded, and the arc-shaped wings formed by the gaps at the front and rear ends of the lower nucleus pulposus are matched to limit the prosthesis from protruding from the vertical axis. The buckle and the lower surface of the plate body are formed by protruding a number of inverted teeth.