CN218979346U - Intervertebral implant capable of being spread - Google Patents

Abstract

The utility model discloses a spreadable intervertebral implant, which belongs to the technical field of orthopedic implants, and comprises a main body frame, wherein an upper spreader and a lower spreader are respectively arranged above and below the main body frame, a spreading structure is arranged in the main body frame, and the spreading structure comprises a push block and a driving rod, and the push block is in transmission connection with each spreader so as to drive each spreader to spread outwards in the process of moving the push block back and forth in the main body frame; the pushing block is frame-shaped, the inner cavity is used as a bone grafting cavity, the tail part of the driving rod is positioned on the front wall of the pushing block, a bone grafting channel is arranged on the rear wall of the pushing block, and a through inserting opening is arranged on the rear wall of the main body frame; the left side wall and the right side wall of the push block are respectively provided with a sliding column, the left side and the right side of each supporting body are respectively provided with a vertical plate which extends along the front-back direction and is positioned between the side wall of the push block and the side wall of the main body frame, and the vertical plates are provided with inclined sliding grooves matched with the sliding columns. The expandable intervertebral implant is convenient to adjust, has a large amount of bone grafting and has good expansion stability.

Description

Intervertebral implant capable of being spread

Technical Field

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

Background

The cervical interbody fusion can effectively treat cervical degeneration, instability and other characteristics, and can fuse upper and lower vertebral bodies, maintain the height of an intervertebral space, restore physiological lordosis, relieve nerve root pressure and maintain spinal stability. The clinical effect is satisfactory, the operation wound is small, and the operation is convenient.

In recent years, along with popularization of clinical application and progress of theoretical research, it is gradually found that certain defects exist in a conventional intervertebral implant, for example, in the process of implanting the intervertebral implant into a vertebral body, bone grafting window bone grafting or bone grafting material filling needs to be performed firstly, then a knocking tool such as a bone hammer or a sliding hammer is used for knocking the intervertebral implant to implant the intervertebral implant into an intervertebral space, and readjustment of the intervertebral implant is difficult; for example, although the intervertebral implant can effectively ensure the height of the intervertebral space and relieve the symptoms of compression caused by the vertebral bodies, the intervertebral implant has the problems of poor bone grafting effect, small bone grafting quantity, low bone fusion rate, unsatisfactory physiological lordosis recovery of the vertebral bodies after the vertebral body fusion operation and the like.

In order to solve the above-mentioned problem, patent application with application number 202111307020.X discloses a distractable intervertebral implant, in which embodiment 1 of the distractable intervertebral implant drives a head distraction block to approach a tail frame through a driving rod so that a distraction body is outwards opened, although the surface of the head distraction block opposite to each distraction body and the surface of the tail frame opposite to each distraction body are both pushed and matched by adopting a pushing inclined plane, and dovetail-shaped bosses and dovetail-shaped sliding grooves which are mutually matched are arranged on the pushing inclined plane, the stability of the distraction body is still poor in the distraction process, and the relative position of the distraction body is easy to change.

Disclosure of Invention

The technical problem to be solved by the utility model is to provide the expandable intervertebral implant which is convenient to adjust, has a large amount of bone grafting and good expansion stability.

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

the utility model provides a can strut intervertebral implant, includes the main part frame, the top and the below of main part frame are equipped with respectively and strut the body and prop down the body, the surface of going up the body of propping up is the arcwall face, the surface of propping up down the body is the wedge face, wherein:

the main body frame is internally provided with a spreading structure, the spreading structure comprises a push block and a driving rod for driving the push block to move forwards and backwards in the main body frame, and the push block is in transmission connection with each spreading body so as to drive each spreading body to spread outwards in the process of moving forwards and backwards in the main body frame;

the pushing block is frame-shaped, the inner cavity is used as a bone grafting cavity, the tail part of the driving rod is positioned on the front wall of the pushing block, a bone grafting channel communicated with the bone grafting cavity is arranged on the rear wall of the pushing block, and a plug-in opening which penetrates through and is used for inserting an operation instrument is arranged on the rear wall of the main body frame at a position corresponding to the bone grafting channel;

the left side wall and the right side wall of the push block are respectively provided with a sliding column extending outwards transversely, the left side and the right side of each supporting body are respectively provided with a vertical plate extending along the front-back direction and positioned between the side wall of the push block and the side wall of the main body frame, and the vertical plates are provided with oblique sliding grooves matched with the sliding columns.

Further, a sliding groove extending along the front-back direction and used for accommodating the tail end of the sliding column is arranged on the side wall of the main body frame.

Further, each of the supporting bodies is provided with an avoiding groove for avoiding the opposite side vertical plate.

Further, the cross section of the spool is in a drop shape or a diamond shape protruding toward the rear side.

Further, be equipped with first actuating lever mounting hole on the front wall of main part frame, on the front wall of ejector pad with the corresponding position of first actuating lever mounting hole is equipped with the second actuating lever mounting hole, the actuating lever is including being located the head and spiral assembly be in screw rod section in the first actuating lever mounting hole, and be located the afterbody with second actuating lever mounting hole matched with polished rod section, the afterbody of polished rod section be equipped with the rear end face of the front wall of ejector pad keeps off complex step portion.

Further, an annular groove is arranged between the screw rod section and the polish rod section of the driving rod, and a C-shaped clamping ring which is matched with the front end face of the front wall of the push block in a blocking way is arranged in the annular groove.

Further, a through snap ring assembly groove is formed in the position, corresponding to the annular groove, of the upper supporting body.

Further, two sides of the rear part of the rear wall of the main body frame are provided with holding grooves with negative angles;

and/or, the front wall and the rear wall of the main body frame are of thickened design, and the middle part of the main body frame is provided with a vertically extending reinforcing plate, so that the front wall and the rear wall of the main body frame are in a cross shape, and the front side and the rear side of each supporting body are respectively provided with a reinforcing plate avoiding groove for avoiding the reinforcing plate.

Further, a reinforcing rib is arranged on the front wall of the push block at the position of the second driving rod mounting hole.

Further, each supporting body is provided with a porous structure or a bone trabecula structure;

and/or each propping body is a 3D printing structure;

and/or the materials of the supporting bodies are titanium alloy or tantalum or niobium-zirconium alloy.

The utility model has the following beneficial effects:

the outer surface of the upper supporting body is an arc surface, and the outer surface of the lower supporting body is a wedge surface, so that the utility model more accords with the physiological angle of the vertebral endplate, can better recover the height and tension of the vertebral segment, and ensures the stability of the vertebral column; the pushing block in the main body frame is in a frame shape, the inner cavity is used as a bone grafting cavity, the tail part of the driving rod is positioned on the front wall of the pushing block, the rear wall of the pushing block is provided with a bone grafting channel communicated with the bone grafting cavity, and the position, corresponding to the bone grafting channel, of the rear wall of the main body frame is provided with a through insertion opening for inserting operation instruments; the left side wall and the right side wall of the push block are respectively provided with a sliding column extending transversely outwards, the left side and the right side of each expanding body are respectively provided with a vertical plate extending along the front-back direction and positioned between the side wall of the push block and the side wall of the main body frame, and the vertical plates are provided with oblique sliding grooves matched with the sliding columns.

Drawings

FIG. 1 is a schematic view of the structure of an expandable intervertebral implant of the present utility model when not expanded;

FIG. 2 is a schematic view of the distracted intervertebral implant of the present utility model shown distracted;

FIG. 3 is a schematic view of the internal structure of the distractable intervertebral implant of the present utility model;

FIG. 4 is a schematic view of the structure of the body frame of the distractable intervertebral implant of the present utility model;

FIG. 5 is a schematic view of the structure of an upper distractor in the distractable intervertebral implant of the present utility model;

FIG. 6 is a schematic view of the structure of a lower distractor in the distractable intervertebral implant of the present utility model;

FIG. 7 is a schematic illustration of the construction of a pusher block in an expandable intervertebral implant according to the present utility model;

FIG. 8 is a schematic view of the drive rod of the distractable intervertebral implant of the present utility model;

fig. 9 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.

In the description of the present utility model, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", etc., are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

The utility model provides a distractable intervertebral implant, as shown in figures 1-9, comprising a main body frame 1, wherein an upper distracting body 2 and a lower distracting body 3 are respectively arranged above and below the main body frame 1, the outer surface of the upper distracting body 2 is an arc-shaped surface, and the outer surface of the lower distracting body 3 is a wedge-shaped surface, wherein:

the main body frame 1 is internally provided with a spreading structure, the spreading structure comprises a push block 4 and a driving rod 5 for driving the push block 4 to move forwards and backwards in the main body frame 1, and the push block 4 is in transmission connection with each spreading body so as to drive each spreading body to spread outwards in the process of moving forwards and backwards in the main body frame 1;

the pushing block 4 is frame-shaped, the inner cavity is used as a bone grafting cavity 41, the tail part of the driving rod 5 is positioned on the front wall of the pushing block 4, a bone grafting channel 42 communicated with the bone grafting cavity 41 is arranged on the rear wall of the pushing block 4, and an inserting opening 11 which penetrates and is used for inserting an operation instrument is arranged on the rear wall of the main body frame 1 at a position corresponding to the bone grafting channel 42;

the left and right side walls of the push block 4 are respectively provided with a sliding column 43 extending outwards transversely, the left and right sides of each supporting body are respectively provided with a vertical plate 21 and 31 extending along the front and rear direction and positioned between the side wall of the push block 4 and the side wall of the main body frame 1, and the vertical plates 21 and 31 are provided with inclined sliding grooves 22 and 32 matched with the sliding columns 43.

When the expandable intervertebral implant is used in an operation, firstly, the expandable intervertebral implant is in a closed/non-expanded state shown in fig. 1, the implant is clamped in an intervertebral space by using the holder, after the implant is placed in the intervertebral space, the position of the implant in the intervertebral space is observed by using the imaging equipment, the implant is adjusted to be placed at a proper position by using the holder, then the operating instrument is used for driving the driving rod 5 through the inserting opening 11 and the bone grafting channel 42, the driving rod 5 drives the pushing block 4 to move back and forth in the main body frame 1, the sliding column 43 on the pushing block 4 is matched with the inclined sliding grooves 22 and 32 on the vertical plates 21 and 31 of each expanding body to enable each expanding body to expand outwards (namely, the state shown in fig. 2), in the process, the vertical plates 21 and 31 of each expanding body slide between the side wall of the pushing block 4 and the side wall of the main body frame 1, so that the angle of each expanding body is fixed when each expanding body is ensured, and the relative position of each expanding body is not easy to change; 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 (artificial bone) such as bone mud, bone blocks, bone powder and the like are implanted into the bone grafting cavity 41 through the grafting opening 11 and the bone grafting channel 42 by using a bone grafting instrument.

The outer surface of the upper supporting body is an arc surface, and the outer surface of the lower supporting body is a wedge surface, so that the utility model more accords with the physiological angle of the vertebral endplate, can better recover the height and tension of the vertebral segment, and ensures the stability of the vertebral column; the pushing block in the main body frame is in a frame shape, the inner cavity is used as a bone grafting cavity, the tail part of the driving rod is positioned on the front wall of the pushing block, the rear wall of the pushing block is provided with a bone grafting channel communicated with the bone grafting cavity, and the position, corresponding to the bone grafting channel, of the rear wall of the main body frame is provided with a through insertion opening for inserting operation instruments; the left side wall and the right side wall of the push block are respectively provided with a sliding column extending transversely outwards, the left side and the right side of each expanding body are respectively provided with a vertical plate extending along the front-back direction and positioned between the side wall of the push block and the side wall of the main body frame, and the vertical plates are provided with oblique sliding grooves matched with the sliding columns. The utility model is mainly suitable for spinal fusion fixation operation, in particular for cervical vertebra fusion fixation operation.

As shown in fig. 1 to 4, the side wall of the main body frame 1 may be provided with a sliding groove 12 extending in the front-rear direction and used for accommodating the end of the sliding column 43, that is, the end of the sliding column 43 is inserted into the sliding groove 12, so that the push block 4 can be effectively prevented from overturning due to the torque generated by the rotation of the driving rod 5, so that each of the supporting bodies can be stably lifted, and the stability of the supporting bodies is improved.

As shown in fig. 5-6, each of the spreader bodies may be provided with a relief groove 23, 33 for relieving the opposite side risers 21, 31 so as to relieve the opposite side risers 31, 21.

As shown in fig. 1-3 and 7, the cross section of the strut 43 may be in the shape of a drop or diamond protruding toward the rear side, i.e., the rear side of the strut 43 may have a protruding structure, so that the respective struts are prevented from falling/coming off during the implant distraction process. The number of the sliding columns 43 can be 2 symmetrical or 4 symmetrical, and the number of the inclined sliding grooves 22, 32 on the vertical plates 21, 31 of the corresponding supporting bodies is 2 or 4 corresponding. In the embodiment shown in the drawings, the number of the slide posts 43 is 4, and the number of the diagonal slide grooves 22, 32 is 4.

In order to facilitate the driving of the push block 4 to move back and forth in the main body frame 1, various structural forms can be adopted, which can be easily conceived by those skilled in the art, and the present utility model preferably adopts the following structural forms:

as shown in fig. 4 and fig. 7-8, a first driving rod mounting hole 13 may be formed in the front wall of the main body frame 1, a second driving rod mounting hole 44 is formed in a position corresponding to the first driving rod mounting hole 13 on the front wall of the push block 4, the driving rod 5 includes a screw rod section 51 positioned at the head and spirally assembled in the first driving rod mounting hole 13, and a polish rod section 52 positioned at the tail and matched with the second driving rod mounting hole 44, a step portion 53 (i.e. the polish rod section 52 and the step portion 53 are arranged in a step manner) in a blocking fit with the rear end face of the front wall of the push block 4 is arranged at the tail of the polish rod section 52, so that the push block 4 can be accurately adjusted to move back and forth in the main body frame 1 through the driving rod 5, and further the spreading height of each spreading body can be accurately adjusted. The rear end surface of the stepped portion 53 is provided with an instrument operation hole (quincuncial groove) 54 to facilitate instrument operation. When the double offset ring spanner is used, the double offset ring spanner is inserted into the plum blossom groove 54 and is used for rotationally driving the driving rod 5 to advance, and the driving rod 5 pushes the front wall rear end surface of the push block 4 through the step part 53, so that the push block 4 moves forwards in the main body frame 1, and each supporting body is outwards opened.

As shown in fig. 8, an annular groove 55 may be provided between the screw section 51 and the polish rod section 52 of the driving rod 5, and a C-shaped snap ring 6 that is in stop fit with the front end face of the front wall of the push block 4 is provided in the annular groove 55, so that after the driving rod 5 is assembled, the C-shaped snap ring 6 is placed into the annular groove 55 of the driving rod 5, so that the driving rod 5 becomes in an undetachable state, the driving rod 5 is prevented from being pulled back/retracted from the second driving rod mounting hole 44, and when the driving rod 5 moves back, the driving rod 5 is prevented from being pulled back due to excessive retraction.

As shown in fig. 5 and 9, a location on the upper spreader body 2 corresponding to the annular groove 55 may be provided with a snap ring fitting groove 24 therethrough so as to facilitate placement of the C-shaped snap ring 6 into the annular groove 55 of the driving rod 5. When the C-shaped clamp ring 6 is assembled, the C-shaped clamp ring 6 can be held so that the opening 61 of the C-shaped clamp ring 6 faces the annular groove 55 of the driving rod 5, and the C-shaped clamp ring 6 is placed into the annular groove 55 along the clamp ring assembling groove 24 of the upper supporting body 2 in a knocking mode. Further, the size of the opening 61 of the C-shaped clasp 6 is preferably smaller than the diameter of the driving rod 5 at the annular groove 55, so that the C-shaped clasp 6 can clasp the driving rod 5 after being placed in the annular groove 55, and the C-shaped clasp 6 is prevented from falling off.

As shown in fig. 1 to 4, both sides of the rear portion of the rear wall of the main body frame 1 may be provided with a negative angle gripping groove 14 to facilitate gripping by the gripper. The front wall and the rear wall of the main body frame 1 can be of thickened design, and the middle part of the main body frame 1 can be provided with a vertically extending reinforcing plate 15, so that the front wall and the rear wall of the main body frame 1 are in a cross shape, the strength of the front wall and the rear wall of the main body frame 1 can be improved, and deformation caused by the tensile force of the driving rod 5 can be effectively resisted. The front side and the rear side of each supporting body can be provided with reinforcing plate avoiding grooves 25 and 35 for avoiding the reinforcing plate 15 so as to avoid the reinforcing plate 15. The front wall of the push block 4 may be provided with a reinforcing rib at the second driving rod mounting hole 44 to increase the strength of the front wall of the push block 4, and effectively resist deformation caused by the pressure of the driving rod 5.

In order to induce bone in-growth, promote bone grafting fusion and strengthen the fusion effect of the intervertebral implant, each supporting body can be provided with a porous structure or a bone trabecular structure. Each of the supporting bodies can be of a 3D printing structure so as to conveniently form a porous structure, each of the supporting bodies can be of a 3D printing solid structure and a 3D printing porous structure in various modes, so that the shape/size of each of the supporting bodies can be customized individually according to the condition and the requirement of the intervertebral space of a patient, the supporting bodies with corresponding heights/angles are designed, and the supporting bodies are perfectly matched with the intervertebral space of the patient. The material of each spreader is preferably titanium alloy or tantalum or niobium-zirconium alloy.

In summary, the utility model relates to an expandable intervertebral implant which combines a 3D printing technology and can be adjusted at any height, the implant can be adjusted to an optimal position in an intervertebral disc to carry out intervertebral orthopedic in operation, the expanding force of the implant can perfectly restore the height and tension of vertebral segments, the compression is relieved, the physiological curvature of the vertebra is restored, the osseous fusion is increased, the stability of the vertebral column is ensured, and therefore, the implant has better fixity and fusion performance, and the clinical requirements are met. The driving rod can be adjusted by matching with the instrument (the box spanner), so that the implant can be expanded/retracted, the height of the implant can be adjusted at will within the expandable range, the operation is simple and convenient, when the implant is implanted into the intervertebral disc, the implant is in a closed state, the implant can be easily implanted into the intervertebral disc with the height to be recovered, a doctor can adjust the height of the implant through the box spanner according to the condition in the intervertebral disc, the best effect is achieved, and the bone grafting instrument can perform bone grafting or bone grafting material filling through the reserved grafting opening of the implant and the bone grafting channel, so that 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 the main part frame, the top and the below of main part frame are equipped with respectively and strut body and lower strut body, the surface of going up the strut body is the arcwall face, the surface of lower strut body is the wedge face, wherein:

the main body frame is internally provided with a spreading structure, the spreading structure comprises a push block and a driving rod for driving the push block to move forwards and backwards in the main body frame, and the push block is in transmission connection with each spreading body so as to drive each spreading body to spread outwards in the process of moving forwards and backwards in the main body frame;

the pushing block is frame-shaped, the inner cavity is used as a bone grafting cavity, the tail part of the driving rod is positioned on the front wall of the pushing block, a bone grafting channel communicated with the bone grafting cavity is arranged on the rear wall of the pushing block, and a plug-in opening which penetrates through and is used for inserting an operation instrument is arranged on the rear wall of the main body frame at a position corresponding to the bone grafting channel;

the left side wall and the right side wall of the push block are respectively provided with a sliding column extending outwards transversely, the left side and the right side of each supporting body are respectively provided with a vertical plate extending along the front-back direction and positioned between the side wall of the push block and the side wall of the main body frame, and the vertical plates are provided with oblique sliding grooves matched with the sliding columns.

2. The distractible intervertebral implant of claim 1, wherein the side walls of the body frame are provided with a chute extending in an anterior-posterior direction for receiving the distal end of the strut.

3. The distractable intervertebral implant of claim 1 wherein each distractor has a relief slot for relief of the contralateral riser.

4. The distractible intervertebral implant of claim 1, wherein the strut is in cross-section in the shape of a drop or diamond protruding posteriorly.

5. The distractible intervertebral implant of any one of claims 1-4, wherein a first drive rod mounting hole is provided in a front wall of the main body frame, a second drive rod mounting hole is provided in a front wall of the push block at a position corresponding to the first drive rod mounting hole, the drive rod comprises a screw rod section positioned at a head and spirally assembled in the first drive rod mounting hole, and a polish rod section positioned at a tail portion and matched with the second drive rod mounting hole, and a step portion in stop fit with a rear end face of the front wall of the push block is provided at the tail portion of the polish rod section.

6. The distractable intervertebral implant of claim 5, wherein an annular groove is provided between the screw section and the polish rod section of the drive rod, and a C-shaped snap ring is provided in the annular groove that is in stop fit with the front face of the front wall of the pusher block.

7. The distractible intervertebral implant of claim 6 wherein the upper distractor is provided with a snap ring assembly groove therethrough at a location corresponding to the annular groove.

8. The distractible intervertebral implant of claim 5, wherein the posterior two sides of the posterior wall of the body frame are provided with negative angle holding grooves;

and/or, the front wall and the rear wall of the main body frame are of thickened design, and the middle part of the main body frame is provided with a vertically extending reinforcing plate, so that the front wall and the rear wall of the main body frame are in a cross shape, and the front side and the rear side of each supporting body are respectively provided with a reinforcing plate avoiding groove for avoiding the reinforcing plate.

9. The distractible intervertebral implant of claim 5, wherein the anterior wall of the pusher block is provided with a stiffener at the second drive rod mounting hole.

10. The distractable intervertebral implant of claim 5, wherein each distractor is provided with a porous or trabecular bone structure;

and/or each propping body is a 3D printing structure;

and/or the materials of the supporting bodies are titanium alloy or tantalum or niobium-zirconium alloy.

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