CN219021766U - Distracting intervertebral implant - Google Patents

Abstract

The utility model discloses a spreadable intervertebral implant, which belongs to the technical field of orthopedic implants, and comprises a spreading structure, wherein an upper spreading body and a lower spreading body are respectively arranged above and below the spreading structure, the spreading structure comprises a head frame, a tail spreading block and a driving rod, and the front side wall of the head frame and the tail spreading block are respectively matched with each spreading body by pushing inclined planes; the head frame comprises a front side wall, a rear side wall and a pair of lateral connecting arms, an inner cavity surrounded by the head frame is used as a bone grafting cavity, a bone grafting channel is arranged on the rear side wall of the head frame, and a splicing opening is arranged on the tail supporting block at a position corresponding to the bone grafting channel; one of the lateral connecting arm of the head frame and each of the supporting bodies is provided with a diagonal guide rail, and the other is provided with a guide rail chute matched with the diagonal guide rail. The expandable intervertebral implant has large bone grafting cavity, large bone grafting quantity and good expanding stability.

Description

Distracting intervertebral implant

Technical Field

The utility model relates to the technical field of orthopedic implants, in particular to an expandable intervertebral implant.

Background

The lumbar interbody fusion can effectively treat lumbar degenerative diseases, unstable spines and other characteristics, and can achieve the effects of fusing upper and lower vertebral bodies, maintaining the height of intervertebral space, relieving nerve root pressure and maintaining spine stability. With the development of orthopedic spinal implants in recent years, the surgical modes of spinal fusion devices are more and more, the types of implants are continuously promoted, a plurality of new materials and structures are developed in the process, and the development of internal fixation of the spinal column is promoted. At present, the conventional spine internal fixation operation adopts a conventional PEEK fusion device, and the PEEK fusion device has excellent mechanical strength and a low manufacturing method, so that the PEEK fusion device becomes a mainstream spine implantation mode at present.

Along with popularization of clinical application and progress of theoretical research, problems of a conventional fusion device are gradually exposed, such as the existing expandable intervertebral implant on the market can effectively ensure the height of an intervertebral space and relieve symptoms pressed by a vertebral body, but the problems of small bone grafting cavity, small bone grafting quantity, poor bone grafting effect, low bone fusion rate, unsatisfactory restoration of physiological lordosis of the vertebral body after the vertebral body fusion operation and the like exist, and the stability of the implant is poor in the expanding process, and the relative positions of upper and lower expanding bodies/cover plates of the implant are easy to change.

Disclosure of Invention

The technical problem to be solved by the utility model is to provide the expandable intervertebral implant with large bone implantation cavity, large bone implantation quantity and good expansion stability.

In order to solve the technical problems, the utility model provides the following technical scheme:

the utility model provides an implant between can strut, includes struts the structure, the top and the below of strut the structure are equipped with respectively and strut body and lower strut body, wherein:

the expanding structure comprises a head frame, a tail expanding block positioned at the rear part of the head frame and a driving rod used for driving the head frame and the tail expanding block to move relatively, and the front side wall of the head frame and the tail expanding block are respectively matched with each expanding body by pushing inclined surfaces in a pushing way so as to drive each expanding body to expand outwards in the relative movement process of the head frame and the tail expanding block;

the head frame comprises a front side wall positioned at the front part of the implant, a rear side wall positioned at the rear part of the implant and a pair of lateral connecting arms connected with the front side wall and the rear side wall, an inner cavity surrounded by the head frame is used as a bone grafting cavity, a bone grafting channel communicated with the bone grafting cavity is arranged on the rear side wall of the head frame, and a splicing opening penetrating through the bone grafting channel for inserting a bone grafting instrument is arranged at a position corresponding to the bone grafting channel on the tail part supporting block.

Further, in the relative movement process of the head frame and the tail expanding block, the expanding bodies are driven to expand towards the vertical direction.

Furthermore, one of the lateral connecting arms and the supporting bodies of the head frame is provided with an oblique guide rail, and the other is provided with a guide rail chute matched with the oblique guide rail.

Further, the middle part of the lateral connecting arm of the head frame is provided with the oblique guide rail, and the inner side of each supporting body is provided with the guide rail chute.

Further, a first driving rod mounting hole is formed in the rear side wall of the head frame, a penetrating second driving rod mounting hole is formed in the position, corresponding to the first driving rod mounting hole, of the tail opening block, the head of the driving rod is connected with the first driving rod mounting hole in a threaded mode, and the tail of the driving rod is axially fixed and connected with the second driving rod mounting hole in a rotatable mode in the circumferential direction.

Further, the driving rod comprises a guide shaft, the front part of the guide shaft is provided with a screw rod section which is in threaded connection with the first driving rod mounting hole, the diameter of the guide shaft is larger than that of the screw rod section, and a guide inclined plane is arranged between the guide shaft and the screw rod section.

Further, the rear portion of guiding axle is equipped with annular groove, wherein:

a clamping ring groove is formed in the second driving rod mounting hole, and C-shaped clamping rings are arranged in the annular groove and the clamping ring groove;

and/or, the rear end of the guide shaft is provided with an annular boss, the annular groove is positioned at the front edge of the annular boss, and the second driving rod mounting hole is a step hole and comprises a large-diameter section matched with the annular boss and a small-diameter section matched with the guide shaft.

Further, a dovetail-shaped boss extending along the relative sliding direction is arranged on one of the surfaces of the front side wall of the head frame, which are opposite to the supporting bodies, and the surfaces of the tail supporting blocks, which are opposite to the supporting bodies, and a dovetail-shaped chute matched with the dovetail-shaped boss is arranged on the other surface.

Furthermore, one of the side surfaces of the upper opening body and the lower opening body is provided with an inclined beam, the other side surface is provided with an inclined beam chute matched with the inclined beam, and the front edge and the rear edge of the inclined beam are both oblique edges and are splayed.

Further, the oblique beam comprises a front oblique beam positioned at the front end of the expanding body and a rear oblique beam positioned at the rear end of the expanding body, wherein the front part of the oblique edge of the front oblique beam is used as a pushing oblique plane between the front side wall of the head frame and the corresponding expanding body, and the rear part of the oblique edge of the rear oblique beam is used as a pushing oblique plane between the tail expanding block and the corresponding expanding body;

and/or the height of the oblique beam is equal to the height of the expandable intervertebral implant when the expandable intervertebral implant is not expanded.

Further, the pushing and pushing fit of the pushing inclined plane is wedge-shaped dovetail fit, and the pushing inclined plane is wedge-shaped inclined plane.

Further, the upper surface and the lower surface of the expandable intervertebral implant are inclined along the width direction, and the inclination angle is 0-45 degrees;

and/or the plugging opening is internally connected with a plugging screw plug through threads;

and/or the two sides of the rear part of the tail part stretching block are provided with a holder groove.

Further, the upper supporting body and the lower supporting body are both provided with porous structures;

and/or, the upper supporting body and the lower supporting body are 3D printing structures;

and/or the upper and lower supporting bodies are made of titanium alloy or tantalum or niobium-zirconium alloy.

The utility model has the following beneficial effects:

compared with the prior art, the head frame of the utility model extends along the front and rear directions of the expandable intervertebral implant and the length of the head frame is equivalent to the total length of the expandable intervertebral implant, so that a large amount of bone grafting space can be reserved in the head frame, after the expandable intervertebral implant is implanted into a human body for expanding, the interior of the implant still has a large bone grafting cavity, bone filler materials such as bone blocks, bone cement and the like can be implanted into the bone grafting cavity by utilizing the bone grafting instrument to pass through the bone grafting opening and the bone grafting channel for expanding the bone grafting cavity, and the bone filler materials such as bone cement and the like are fully utilized to expand the bone grafting cavity after the bone cement is fully utilized to fully utilize the bone cement, thereby improving the bone cement fusion effect of the implant, fully meeting the requirements of the implant in clinical setting and improving the bone fusion and the bone cement; the lateral connecting arm of the head frame and one of the supporting bodies are provided with the oblique guide rail, the other one of the lateral connecting arm of the head frame and the supporting bodies is provided with the guide rail sliding groove matched with the oblique guide rail, so that the oblique guide rail slides in the guide rail sliding groove in the implant supporting process, the angle of each supporting body is ensured to be fixed when the supporting bodies are supported, the relative positions of the supporting bodies are not easy to change, the stability of the supporting bodies is improved, the compression resistance of the supporting bodies is enhanced, the supporting stability of the implant is good, the height and the tension of the vertebral segments can be better recovered, and the stability of the vertebral column is ensured.

Drawings

FIG. 1 is a schematic view of an exploded construction of the distractable intervertebral implant of the present utility model;

FIG. 2 is a schematic view of the distractable intervertebral implant of the present utility model prior to distraction;

FIG. 3 is a schematic view of the distractable intervertebral implant of the present utility model shown distracted, with (a) shown in side view and (b) shown in cross-sectional side view;

FIG. 4 is a front and rear view of the distractable intervertebral implant of the present utility model before distraction;

FIG. 5 is a schematic view of the head frame of the distractable intervertebral implant of the present utility model;

FIG. 6 is a schematic view of the configuration of a caudal distraction block in the distractable intervertebral implant of the present utility model;

FIG. 7 is a schematic view of the structure of an upper distractor in the distractable intervertebral implant of the present utility model;

FIG. 8 is a schematic view of the structure of a lower distractor in the distractable intervertebral implant of the present utility model;

FIG. 9 is a schematic view of the drive rod of the distractable intervertebral implant of the present utility model;

fig. 10 is a schematic view of the structure of a C-shaped clasp in the distractable intervertebral implant of the present utility model.

Detailed Description

In order to make the technical problems, technical solutions and advantages to be solved more apparent, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.

The utility model provides a distractable intervertebral implant (i.e. fusion cage), which comprises a distraction structure, wherein an upper distraction body 1 and a lower distraction body 2 are respectively arranged above and below the distraction structure, and the distractable intervertebral implant comprises a main body and a main body, wherein:

the expanding structure comprises a head frame 3, a tail expanding block 4 positioned at the rear part of the head frame 3 and a driving rod 5 used for driving the head frame 3 and the tail expanding block 4 to move relatively, wherein the front side wall 31 of the head frame 3 and the tail expanding block 4 are respectively matched with each expanding body by pushing inclined surfaces in a pushing way so as to drive each expanding body to expand outwards in the relative movement process of the head frame 3 and the tail expanding block 4; the pushing and pushing matching of the pushing inclined plane can be particularly wedge-shaped dovetail matching, and the pushing inclined plane can be a wedge-shaped inclined plane;

the head frame 3 comprises a front side wall 31 positioned at the front part of the implant, a rear side wall 32 positioned at the rear part of the implant and a pair of lateral connecting arms 33 connecting the front side wall 31 and the rear side wall 32, an inner cavity surrounded by the head frame 3 is used as a bone grafting cavity 30, a bone grafting channel 34 communicated with the bone grafting cavity 30 is arranged on the rear side wall 32 of the head frame 3, and a plug-in opening 41 for inserting a bone grafting instrument is arranged on the tail part expanding block 4 at a position corresponding to the bone grafting channel 34;

one of the lateral connecting arms 33 and the supporting bodies of the head frame 3 is provided with a diagonal guide rail 35, and the other is provided with guide rail sliding grooves 12 and 22 matched with the diagonal guide rail 35.

When the expandable intervertebral implant is used in operation, the expandable intervertebral implant is firstly in a closed/non-expanded state shown in fig. 2, the implant is clamped by the clamping device and placed in an intervertebral space, after the implant is placed in the intervertebral space, the position of the implant in the intervertebral space is observed through imaging equipment, the driving rod 5 is driven by the operation device, the driving rod 5 drives the head frame 3 and the tail expanding block 4 to relatively move, and the head frame 3 and the tail expanding block 4 push each expanding body through pushing (wedge-shaped) inclined planes so as to enable each expanding body to be outwards expanded (namely, the state shown in fig. 3); during the process, a doctor can observe the expandable intervertebral implant through the developing device, freely adjust the expanding height of each expanding body through controlling the driving rod 5, and take out the operation instrument after confirming the proper position; finally, bone filling materials such as bone mud, bone blocks, bone powder and the like are implanted into the bone grafting cavity 30 through the grafting opening 41 and the bone grafting channel 34 by using a bone grafting instrument.

Compared with the prior art, the head frame of the utility model extends along the front and rear directions of the expandable intervertebral implant and the length of the head frame is equivalent to the total length of the expandable intervertebral implant, so that a large amount of bone grafting space can be reserved in the head frame, after the expandable intervertebral implant is implanted into a human body for expanding, the interior of the implant still has a large bone grafting cavity, bone filler materials such as bone blocks, bone cement and the like can be implanted into the bone grafting cavity by utilizing the bone grafting instrument to pass through the bone grafting opening and the bone grafting channel for expanding the bone grafting cavity, and the bone filler materials such as bone cement and the like are fully utilized to expand the bone grafting cavity after the bone cement is fully utilized to fully utilize the bone cement, thereby improving the bone cement fusion effect of the implant, fully meeting the requirements of the implant in clinical setting and improving the bone fusion and the bone cement; the lateral connecting arm of the head frame and one of the supporting bodies are provided with the oblique guide rail, the other one of the lateral connecting arm of the head frame and the supporting bodies is provided with the guide rail sliding groove matched with the oblique guide rail, so that the oblique guide rail slides in the guide rail sliding groove in the implant supporting process, the angle of each supporting body is ensured to be fixed when the supporting bodies are supported, the relative positions of the supporting bodies are not easy to change, the stability of the supporting bodies is improved, the compression resistance of the supporting bodies is enhanced, the supporting stability of the implant is good, the height and the tension of the vertebral segments can be better recovered, and the stability of the vertebral column is ensured. The utility model is mainly suitable for spinal fusion internal fixation operation, in particular for lumbar fusion fixation operation.

The distractable intervertebral implant can perfectly restore the height and tension of the vertebral segments by using the distracting force of the implant, realize the compression release and the physiological curvature restoration of the vertebrae, increase the bone fusion of the intervertebral implant, ensure the stability of the vertebral column, adjust the implant to the proper position and the height in the operation, meet the clinical requirements of the intervertebral orthopedic and the decompression, and has the advantages of stable implant performance, high fusion efficiency and convenient operation.

In particular, as shown in fig. 1, the middle part of the lateral connecting arm 33 of the head frame 3 may be provided with a diagonal guide rail 35, and the inner side of each supporting body may be provided with a guide rail chute 12, 22.

For driving the relative movement of the head frame 3 and the tail spreader block 4, various structural forms can be adopted, which can be easily conceived by those skilled in the art, and the following structural forms are preferably adopted in the utility model:

as shown in fig. 3 and fig. 5-6, the rear side wall 32 of the head frame 3 may be provided with a first driving rod mounting hole 36, a second driving rod mounting hole 42 penetrating through the rear side wall 32 and corresponding to the first driving rod mounting hole 36 is provided on the rear supporting block 4, the head of the driving rod 5 is screwed into the first driving rod mounting hole 36, the rear of the driving rod 5 is axially fixed and circumferentially rotatably connected in the second driving rod mounting hole 42, so that the relative movement of the head frame 3 and the rear supporting block 4 can be accurately regulated by the driving rod 5, and the supporting height of each supporting body can be accurately regulated.

As shown in fig. 9, the driving rod 5 may include a guide shaft 51, a screw section 52 screwed into the first driving rod mounting hole 36 is provided at the front portion of the guide shaft 51, the diameter of the guide shaft 51 is larger than that of the screw section 52, and a guide inclined surface 53 is provided between the guide shaft 51 and the screw section 52, so that the guide inclined surface 53 gradually approaches the rear sidewall 32 of the head frame 3 and is in abutment with the rear sidewall 32 during the outward opening of the respective distraction bodies by driving the driving rod 5 using the operation instrument, which is the limit distraction size of the distractable intervertebral implant.

In order to enable the tail of the driving rod 5 to be axially fixed and circumferentially rotatably connected in the second driving rod mounting hole 42, the following structure is preferably adopted:

as shown in fig. 6 and 9-10, the rear portion of the guide shaft 51 may be provided with an annular groove 54, the second drive rod mounting hole 42 is provided with a snap ring groove 43, and the annular groove 54 and the snap ring groove 43 are provided with a C-shaped snap ring 6, so that the tail portion of the drive rod 5 is axially fixed and circumferentially rotatably connected in the second drive rod mounting hole 42.

Further, the rear end of the guide shaft 51 may be provided with an annular boss 55, the annular groove 54 is located at the front edge of the annular boss 55 (i.e. the front surface of the annular boss 55 is used as the rear side wall of the annular groove 54), the second driving rod mounting hole 42 is a stepped hole and includes a large diameter section 421 matched with the annular boss 55 and a small diameter section 422 matched with the guide shaft 51, the contact area between the rear side wall of the annular groove 54 and the rear surface of the C-shaped snap ring 6 can be increased by the arrangement of the annular boss 55, the C-shaped snap ring 6 is prevented from being separated, and the stability of the driving rod 5 can be improved and the driving rod 5 is prevented from shaking due to the fact that the second driving rod mounting hole 42 is a stepped hole.

As shown in fig. 5-8, for stable spreading the upper spreader 1 and the lower spreader 2, the front side wall 31 of the head frame 3 may be provided with dovetail bosses 11, 21 extending in the relative sliding direction on one of the surfaces of the front side wall 31 and the rear side wall 4 opposite to the respective spreaders, and dovetail grooves 37, 47 cooperating with the dovetail bosses 11, 21 are provided on the other surface, and the dovetail bosses 11, 21 and the dovetail grooves 37, 47 cooperate to prevent the upper spreader 1 and the lower spreader 2 from being separated during spreading. In the embodiment shown in the figures, dovetail bosses 11, 21 are provided on the surfaces of the respective struts facing the front side wall 31 of the head frame 3 and the surfaces of the respective struts facing the tail struts 4, and dovetail grooves 37, 47 are provided on the surfaces of the front side wall 31 of the head frame 3 facing the respective struts and the surfaces of the tail struts 4 facing the respective struts.

The assembly process of the distractible intervertebral implant of the present utility model may be referenced as follows:

during assembly, the dovetail bosses 11 and 21 on the upper supporting body 1 and the lower supporting body 2 and the dovetail sliding groove 37 on the front side wall 31 of the head frame 3 slide in from the closing direction, in the process, the tail supporting block 4 is installed in a matched mode, then the C-shaped clamping ring 6 is plugged into the second driving rod installation hole 42 of the tail supporting block 4, the outer ring of the C-shaped clamping ring 6 is matched with the clamping ring groove 43, finally the driving rod 5 is plugged into the second driving rod installation hole 42 in a clockwise mode until the annular groove 54 of the driving rod 5 is matched with the inner ring of the C-shaped clamping ring 6, in the process, the guide inclined surface 53 is arranged on the driving rod 5, so that the guide shaft 51 of the driving rod 5 easily penetrates through the inner hole of the C-shaped clamping ring 6, in addition, when the assembly is completed, the screw rod section 52 of the driving rod 5 is just screwed into the first driving rod installation hole 36 of the head frame 3, and the driving rod 5 can only rotate axially relative to the tail supporting block 4.

The distracting process of the distractable intervertebral implant of the present utility model may be referenced as follows:

in use, the driving rod 5 is driven to rotate by inserting an instrument operation hole (plum blossom hole) 56 at the tail end of the driving rod 5 through a matching tool, the screw rod section 52 of the driving rod 5 is matched with the first driving rod installation hole 36 of the head frame 3 in the rotating process, the front edge (shoulder) of the annular boss 55 of the driving rod 5 presses the rear surface of the C-shaped clamping ring 6, so that the front surface of the C-shaped clamping ring 6 presses the tail expanding block 4, the head frame 3 and the tail expanding block 4 are close to each other, the dovetail bosses 11 and 21 are matched with the dovetail sliding grooves 37 and 47, and the inclined guide rails 35 are matched with the guide rail sliding grooves 12 and 22, so that the expanding bodies are outwards expanded, and when the guide inclined surface 53 of the driving rod 5 is in contact with the rear side wall 32 of the head frame 3, the expanding size is the limit expanding dimension of the intervertebral implant.

As shown in fig. 1 and fig. 7-8, one of the side surfaces of the upper spreader 1 and the lower spreader 2 may be provided with oblique beams 10, 10', and the other one is provided with oblique beam sliding grooves 20, 20' matched with the oblique beams 10, 10', and the front and rear edges of the oblique beams 10, 10' are oblique edges and are splayed, so that the oblique beams 10, 10 'slide in the oblique beam sliding grooves 20, 20' in the process of spreading the implant, the angle fixation of each spreader is better ensured, the relative position of the spreaders is less likely to change, the stability of the spreaders is better improved, and the compression resistance of the spreaders is further enhanced, thereby ensuring better spreading stability of the implant.

Further, the diagonal beams 10, 10 'may include a front diagonal beam 10 at the front end of the spreader and a rear diagonal beam 10' at the rear end of the spreader, the front portion of the hypotenuse of the front edge of the front diagonal beam 10 being used as a pushing slope between the front side wall 31 of the head frame 3 and the corresponding spreader, the rear portion of the hypotenuse of the rear edge of the rear diagonal beam 10 'being used as a pushing slope between the tail spreader 4 and the corresponding spreader, so that when the front side wall 31 of the head frame 3 and the tail spreader 4 are in pushing engagement with the respective spreaders, the front portion of the hypotenuse of the front edge of the front diagonal beam 10 and the rear portion of the rear edge of the rear diagonal beam 10' are simultaneously in pushing engagement with the front side wall 31 of the head frame 3 and the tail spreader 4, respectively, thereby increasing the contact area of each spreader with the front side wall 31 of the head frame 3 and the tail spreader 4, and improving the stability of the spreaders.

As shown in FIG. 2, the height H of the diagonal beams 10, 10' is preferably equal to the height of the expandable intervertebral implant when the expandable intervertebral implant is not expanded, so that the diagonal beams 10, 10' slide in the diagonal beam runners 20, 20' during the initial expansion of the implant, ensuring the fixed angle of each expansion body during the initial expansion, improving the stability of the expansion body, and increasing the contact area between the diagonal beams 10, 10' and the diagonal beam runners 20, 20', and preventing the implant from overturning and shaking.

As shown in FIG. 4, the superior and inferior surfaces of the distractable intervertebral implant may each be inclined along its width at an angle α of 0-45 degrees, preferably 0-30 degrees, such as 0, 5, 8, 12, 15, 20, 30 degrees, etc., to meet the physiological angles between the different vertebral bodies of different patients.

A blocking screw plug (not shown) may be screwed into the insertion opening 41, so that after the intervertebral implant is implanted into a human body and bone is implanted, the blocking screw plug may be screwed into the insertion opening 41, and bone filling materials such as bone mud, bone blocks, bone powder, etc. in the bone implantation cavity 30 may be prevented from leaking out of the insertion opening 41. As shown in fig. 6, both sides of the rear portion of the tail spreader block 4 may be provided with a gripper groove 44 to facilitate gripper gripping.

To promote bone grafting fusion, both the upper distractor 1 and the lower distractor 2 may be provided with a porous structure. The upper supporting body 1 and the lower supporting body 2 can be 3D printing structures so as to conveniently form a porous structure, meanwhile, the form/size of each supporting body can be customized according to the condition and the requirement of the intervertebral space of a patient, the supporting bodies with corresponding heights/angles are designed, the intervertebral space of the patient is perfectly matched, the self-stability performance of the fusion device is enhanced, in addition, knocking implantation is not needed in the implantation process, and damage to the patient is avoided. The upper spreader 1 and the lower spreader 2 are preferably made of titanium alloy, tantalum, niobium-zirconium alloy or other materials.

In summary, the driving rod can be adjusted by matching the instrument (wrench) to lead the implant to be propped open/retracted, the height of the implant can be adjusted at will within a certain range, the operation is simple and convenient, the bone grafting channel and the driving rod mounting hole are mutually independent and do not interfere with each other, when the implant is implanted into the intervertebral disc, a doctor can adjust the height of the implant by matching the instrument according to the condition in the intervertebral disc, the best effect is achieved, and the bone grafting instrument can implant bone filling materials (artificial bones) such as bone mud, bone blocks, bone meal and the like into the fusion device through the insertion opening and the bone grafting channel, and the fusion effect of the fusion device is enhanced.

While the foregoing is directed to the preferred embodiments of the present utility model, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present utility model, and such modifications and adaptations are intended to be comprehended within the scope of the present utility model.

Claims (10)

1. The utility model provides a can strut intervertebral implant, its characterized in that includes struts the structure, the top and the below of strut the structure are equipped with respectively and strut body and lower and prop the body, wherein:

the expanding structure comprises a head frame, a tail expanding block positioned at the rear part of the head frame and a driving rod used for driving the head frame and the tail expanding block to move relatively, and the front side wall of the head frame and the tail expanding block are respectively matched with each expanding body by pushing inclined surfaces in a pushing way so as to drive each expanding body to expand outwards in the relative movement process of the head frame and the tail expanding block;

the head frame comprises a front side wall positioned at the front part of the implant, a rear side wall positioned at the rear part of the implant and a pair of lateral connecting arms connected with the front side wall and the rear side wall, an inner cavity surrounded by the head frame is used as a bone grafting cavity, a bone grafting channel communicated with the bone grafting cavity is arranged on the rear side wall of the head frame, and a splicing opening penetrating through the bone grafting channel for inserting a bone grafting instrument is arranged at a position corresponding to the bone grafting channel on the tail part supporting block.

2. The distractable intervertebral implant of claim 1 wherein one of the lateral connecting arms of the head frame and each distractor is provided with a diagonal rail and the other is provided with a rail runner that mates with the diagonal rail.

3. The distractable intervertebral implant of claim 1, wherein a first drive rod mounting hole is formed in a rear sidewall of the head frame, a second drive rod mounting hole is formed in the tail distracting block at a position corresponding to the first drive rod mounting hole, a head of the drive rod is in threaded connection with the first drive rod mounting hole, and a tail of the drive rod is axially fixed and circumferentially rotatably connected with the second drive rod mounting hole.

4. The distractible intervertebral implant of claim 3, wherein the drive rod includes a guide shaft having a screw segment at a front portion thereof threadably coupled within the first drive rod mounting hole, the guide shaft having a diameter greater than a diameter of the screw segment, and a guide ramp disposed between the guide shaft and the screw segment.

5. The distractible intervertebral implant of claim 4, wherein the rear portion of the guide shaft is provided with an annular groove, wherein:

a clamping ring groove is formed in the second driving rod mounting hole, and C-shaped clamping rings are arranged in the annular groove and the clamping ring groove;

and/or, the rear end of the guide shaft is provided with an annular boss, the annular groove is positioned at the front edge of the annular boss, and the second driving rod mounting hole is a step hole and comprises a large-diameter section matched with the annular boss and a small-diameter section matched with the guide shaft.

6. The distractible intervertebral implant of claim 1, wherein one of the anterior sidewall of the head frame and the surface of the caudal distractor block opposite each distractor body is provided with a dovetail boss extending in a relative sliding direction and the other surface is provided with a dovetail chute mating with the dovetail boss.

7. The distractable intervertebral implant of claim 1 wherein one of the sides of the upper distracting body and the lower distracting body is provided with a diagonal beam and the other is provided with a diagonal beam chute that mates with the diagonal beam, the front and rear edges of the diagonal beam being beveled and splayed.

8. The distractible intervertebral implant of claim 7, wherein the oblique beams include a front oblique beam at a front end of the distractor and a rear oblique beam at a rear end of the distractor, a front portion of a hypotenuse of a front edge of the front oblique beam serving as a pushing ramp between a front sidewall of the head frame and a corresponding distractor, a rear portion of a hypotenuse of a rear edge of the rear oblique beam serving as a pushing ramp between the tail distractor and a corresponding distractor;

and/or the height of the oblique beam is equal to the height of the expandable intervertebral implant when the expandable intervertebral implant is not expanded.

9. The expandable intervertebral implant of claim 1 wherein the upper and lower surfaces of the expandable intervertebral implant are both inclined along their width at an angle of 0-45 degrees;

and/or the plugging opening is internally connected with a plugging screw plug through threads;

and/or the two sides of the rear part of the tail part stretching block are provided with a holder groove.

10. The distractable intervertebral implant of claim 1, wherein the upper distractor and the lower distractor are each provided with a porous structure;

and/or, the upper supporting body and the lower supporting body are 3D printing structures;

and/or the upper and lower supporting bodies are made of titanium alloy or tantalum or niobium-zirconium alloy.

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