CN118000979A - Modular intervertebral implant unit and intervertebral implant - Google Patents

Abstract

The invention discloses a modularized intervertebral implant monomer and an intervertebral implant, which belong to the technical field of orthopedic implants, wherein the modularized intervertebral implant monomer comprises a spreading structure, an upper support body and a lower support body, the spreading structure comprises a head spreading block, a tail spreading block and a driving rod, and the head spreading block and the tail spreading block are respectively matched with each support body by adopting inclined plane pushing so as to drive each support body to outwards spread in the relative movement process of the head spreading block and the tail spreading block; the rear end of the driving rod is provided with an instrument operation hole, the front end of the driving rod is provided with an extension driving section which extends to the outer side of the head expanding block and can be matched with the instrument operation hole, and the modularized intervertebral implant monomer is provided with a connecting structure which is used for being connected with another modularized intervertebral implant monomer of the same structure in a front-back/left-right side-by-side manner. The modular intervertebral implant monomer and the height of the intervertebral implant can be adjusted at will within a certain range, and can meet different clinical access requirements.

Description

Modular intervertebral implant unit and intervertebral implant

Technical Field

The invention relates to the technical field of orthopedic implants, in particular to a modularized intervertebral implant monomer and an intervertebral implant.

Background

The lumbar interbody fusion can effectively treat lumbar degenerative disease, unstable spine 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 and new materials and structures are developed in the process, and the development of internal fixation of the spinal column is promoted. At present, a conventional PEEK (polyether ether ketone) fusion device is adopted in a conventional spine internal fixation operation, and the conventional PEEK fusion device has excellent mechanical strength and a low manufacturing method, so that the conventional spine internal fixation operation becomes a mainstream spine implantation mode at present.

However, with the promotion of clinical application and the progress of theoretical research, the problem of conventional fusion device is gradually exposed, for example, the existing expandable intervertebral implant on the market can effectively ensure the height of intervertebral space and relieve the symptoms caused by vertebras, but has the problems of poor bone grafting effect, low bone fusion rate, unsatisfactory lumbar vertebrae physiological forward protruding recovery after the vertebras fusion operation and the like, and the conventional fusion device can not reach the optimal implantation height of a patient due to the arrangement of machining and specification, the implantation process needs to be knocked and placed, certain injury is caused to the patient, and in addition, different access modes correspond to different symptoms, but the cost and difficulty of developing implants in different access modes are greatly increased.

Patent application No. 202111307020.X discloses a distractable intervertebral implant, in which example 1, a head distraction block is driven by a driving rod to approach a tail frame so that a distraction body is outwardly opened, which solves the above-mentioned part of the problems, and there is room for improvement.

Disclosure of Invention

The invention aims to provide a modularized intervertebral implant monomer and an intervertebral implant, wherein the height of the modularized intervertebral implant monomer can be adjusted at will within a certain range, and the modularized intervertebral implant monomer and the intervertebral implant can meet different clinical implantation requirements.

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

In one aspect, a modular intervertebral implant monomer is provided, including strutting the structure, strutting the top and the below of structure and being equipped with support body and lower support body respectively, wherein:

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

The rear end of the driving rod is provided with an instrument operation hole, the front end of the driving rod is provided with an extension driving section which extends to the outer side of the head expanding block and can be matched with the instrument operation hole, and the modularized intervertebral implant monomer is provided with a connecting structure which is used for being connected with another modularized intervertebral implant monomer of the same structure in a front-back/left-right side-by-side manner.

Further, a first driving rod mounting hole is formed in the head expanding block, a second driving rod mounting hole is formed in the tail expanding block, the front portion of the driving rod is connected with the first driving rod mounting hole in a threaded mode, and the rear portion of the driving rod is axially fixed and circumferentially rotatably connected with the second driving rod mounting hole.

Further, the head opening block and each supporting body and the surface of the tail opening block opposite to each supporting body are provided with dovetail bosses on one surface, and dovetail grooves matched with the dovetail bosses are formed on the other surface;

And/or the rear part of the driving rod is provided with a first clamping ring groove, a second clamping ring groove is arranged in the second driving rod mounting hole at a position corresponding to the first clamping ring groove, and clamping rings are arranged in the first clamping ring groove and the second clamping ring groove;

And/or, the driving rod is internally provided with an axially extending through hole, and the side surface of the middle part of the driving rod is provided with a bone cement overflow hole communicated with the through hole;

and/or, the instrument operation hole and the extension drive section are both hexagonal.

Further, the front surface of the head expanding block and the rear surface of the tail expanding block are provided with inserting grooves, one inserting boss is arranged on the other inserting boss and can be matched with the inserting grooves, and the inserting grooves and the inserting bosses form the connecting structure.

Further, the side walls of the inserting grooves and the inserting bosses are respectively provided with a concave connecting groove which extends vertically and is matched with each other to accommodate the mortise and tenon pins.

Further, the outside of each supporter all is equipped with tooth form face, wherein:

the tooth-shaped surface is provided with a step dovetail boss on one surface and a step dovetail groove matched with the step dovetail boss on the other surface;

and/or pin holes matched with each other are formed in each support body and the toothed surface, and fixing pins are arranged in the pin holes in a penetrating mode.

Further, bone grafting windows are arranged on each support body and the toothed surface;

And/or, each toothed surface is a 3D printing design;

and/or the material of each tooth-shaped surface is titanium alloy or tantalum or niobium-zirconium alloy;

And/or the end face of each toothed surface is provided with a porous structure.

On the other hand, an intervertebral implant is provided, which is formed by connecting at least two modularized intervertebral implant monomers in parallel from front to back, and an extension driving section of the modularized intervertebral implant monomer with a rear position is spliced in an instrument operation hole of the modularized intervertebral implant monomer with a front position.

In still another aspect, an intervertebral implant is provided, which is formed by connecting at least two modular intervertebral implant monomers side by side, wherein the two modular intervertebral implant monomers share the toothed surface, and the toothed surface covers the supporting bodies of the two modular intervertebral implant monomers.

In still another aspect, an intervertebral implant is provided, which is formed by connecting at least four modularized intervertebral implant monomers in parallel from front to back and from left to right, wherein extension driving sections of two modularized intervertebral implant monomers at the rear are respectively connected in an inserting manner into instrument operation holes of two modularized intervertebral implant monomers at the front, the two modularized intervertebral implant monomers connected in parallel from left to right share the toothed surface, and the toothed surface covers on supporting bodies of the two modularized intervertebral implant monomers connected in parallel from left to right.

The invention has the following beneficial effects:

The modular intervertebral implant monomer and the intervertebral implant provided by the invention have the advantages that the modular intervertebral implant monomer's supporting structure comprises the head supporting block, the tail supporting block and the driving rod, the head supporting block and the tail supporting block are respectively matched with each supporting body of the modular intervertebral implant monomer by adopting inclined plane pushing so as to drive each supporting body to open outwards in the relative moving process of the head supporting block and the tail supporting block, the height of the modular intervertebral implant monomer can be randomly adjusted within a certain range, the optimal implant height of a patient can be achieved by the height specification, knocking placement is not needed in the implantation process, the damage to the patient is avoided, and the modular intervertebral implant monomer still has an implant cavity in the implant after the implant is implanted into a human body, so that bone filling materials such as bone mud, bone blocks and bone powder can be implanted into the implant by using an operating instrument, the increased implant space after the implant is expanded, the bone implantation effect is fully implanted in the implant, the bone fusion in the implant is improved, the bone fusion in the later stage is convenient, the bone fusion device is well fixed, and the clinical requirements are met; the rear end of the driving rod is provided with an instrument operation hole, the front end of the driving rod is provided with an extension driving section which extends to the outer side of the head expanding block and can be matched with the instrument operation hole, so that the extension driving section of the modularized intervertebral implant single body can be matched with (i.e. inserted into and driven by) another modularized intervertebral implant single body with the same structure, and the modularized intervertebral implant single body is provided with a connecting structure which is used for being connected with another modularized intervertebral implant single body with the same structure in a front-back/left-right side-by-side manner.

Drawings

FIG. 1 is a schematic perspective view of a modular intervertebral implant of the present invention when the modular intervertebral implant is distracted;

FIG. 2 is a schematic side cross-sectional view of FIG. 1;

FIG. 3 is a schematic view of the driving rod in FIG. 1;

FIG. 4 is a schematic view of the structure of the upper and lower supports of FIG. 1;

FIG. 5 is a schematic view of the snap ring of FIG. 1;

FIG. 6 is a schematic view of the head spreader block of FIG. 1;

FIG. 7 is a schematic view of the tail spreader block of FIG. 1;

FIG. 8 is a schematic view of the tooth-like surface in FIG. 1, wherein (a) is a perspective view of the tooth-like surface of one specification and (b) is a perspective view of the tooth-like surface of another specification;

FIG. 9 is a schematic view of an assembled structure of the support body and toothed surface of FIG. 1, wherein (a) is a perspective view and (b) is a cross-sectional view of (a);

FIG. 10 is a schematic view of the modular intervertebral implant shown in FIG. 1 connected side-by-side front-to-back with (a) a perspective view and (b) a side cross-sectional view of (a);

FIG. 11 is a schematic view of the modular intervertebral implant shown in FIG. 1 after side-by-side connection of the individual components;

FIG. 12 is a schematic view of the modular intervertebral implant unit of FIG. 1 shown connected side-by-side front-to-back;

FIG. 13 is a schematic view of a use of the modular intervertebral implant single shown in FIG. 1;

fig. 14 is a schematic view of another use of the modular intervertebral implant single shown in fig. 1.

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 invention, 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 invention 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 invention.

In one aspect, the present invention provides a modular intervertebral implant unit, as shown in fig. 1-14, comprising a distracting structure having upper and lower supports 1 and 2 disposed above and below, respectively, wherein:

The expanding structure comprises a head expanding block 3 positioned at the front part, a tail expanding block 4 positioned at the rear part and a driving rod 5 used for driving the head expanding block 3 and the tail expanding block 4 to move relatively, wherein the head expanding block 3 and the tail expanding block 4 are respectively matched with each supporting body by inclined plane pushing so as to drive each supporting body to expand outwards in the relative movement process of the head expanding block 3 and the tail expanding block 4;

the rear end of the driving rod 5 is provided with an instrument operation hole 51, the front end of the driving rod 5 is provided with an extension driving section 52 which extends to the outer side of the head expanding block 3 and can be matched with the instrument operation hole 51, and the modularized intervertebral implant monomer is provided with a connecting structure which is used for being connected with another modularized intervertebral implant monomer of the same structure in a front-back/left-right side-by-side manner.

When the modular intervertebral implant monomer is used in an operation, the modular intervertebral implant monomer is firstly in a closed/non-opened state shown in fig. 10-12, then can be used independently according to the operation requirement, can be connected front and back/left and right side by side to form an intervertebral implant meeting the clinical access requirement, and is placed in an intervertebral space, after the intervertebral implant is placed in the intervertebral space, the position of the intervertebral implant in an intervertebral disc is observed through an imaging device, a driving rod 5 is driven by an operation instrument, the driving rod 5 drives a head opening block 3 and a tail opening block 4 to move relatively (approach each other), and the head opening block 3 and the tail opening block 4 push each support body up and down through inclined planes so as to open each support body outwards, so that the implant opening is completed (namely, the opened state shown in fig. 1-2); during the process, a doctor can observe the intervertebral implant through the developing device, the supporting height of each supporting body is freely adjusted through controlling the driving rod 5, and the instrument is taken out after confirming the proper position; finally, bone filling materials such as bone mud, bone blocks, bone powder and the like are put into the intervertebral implant.

The modular intervertebral implant monomer comprises a head expanding block, a tail expanding block and a driving rod, wherein the head expanding block and the tail expanding block are respectively matched with all supporting bodies of the modular intervertebral implant monomer by inclined plane pushing so as to drive all supporting bodies to be outwards expanded in the relative moving process of the head expanding block and the tail expanding block, the height of the modular intervertebral implant monomer can be randomly adjusted in a certain range, the optimal implant height of a patient can be achieved by the height specification, knocking placement is not needed in the implantation process, injury to the patient is avoided, and the modular intervertebral implant monomer still has an implant cavity inside the implant after being implanted into a human body, so that bone filling materials such as bone mud, bone blocks, bone powder and the like can be implanted into the implant by using an operation instrument, the increased implant space after the implant is fully expanded, the bone grafting effect is improved, the bone grafting fusion in the implant is facilitated, the fixation of the fusion device is good, and the clinical requirements are met; the rear end of the driving rod is provided with an instrument operation hole, the front end of the driving rod is provided with an extension driving section which extends to the outer side of the head expanding block and can be matched with the instrument operation hole, so that the extension driving section of the modularized intervertebral implant single body can be matched with (i.e. inserted into and driven by) another modularized intervertebral implant single body with the same structure, and the modularized intervertebral implant single body is provided with a connecting structure which is used for being connected with another modularized intervertebral implant single body with the same structure in a front-back/left-right side-by-side manner. The invention is particularly suitable for lumbar fusion fixation operation.

For driving the head spreader block 3 and the tail spreader block 4 to move relatively, various structural forms can be adopted, which can be easily considered by those skilled in the art, and the following structural forms are preferably adopted in the invention:

As shown in fig. 1-7, the head expanding block 3 may be provided with a first driving rod mounting hole 31, the tail expanding block 4 is provided with a second driving rod mounting hole 41, the front part of the driving rod 5 is in threaded connection with the first driving rod mounting hole 31, the rear part of the driving rod 5 is axially fixed and circumferentially rotatably connected with the second driving rod mounting hole 41, and thus the expanding heights of the supporting bodies can be accurately adjusted by accurately adjusting the relative movement of the head expanding block 3 and the tail expanding block 4 through the driving rod 5.

Further, in order to axially fix and rotatably connect the rear portion of the driving rod 5 in the second driving rod mounting hole 41, the present invention preferably adopts the following structure:

As further shown in fig. 1-7, the rear portion of the driving rod 5 may be provided with a first snap ring groove 53, a second snap ring groove 42 is provided in the second driving rod mounting hole 41 at a position corresponding to the first snap ring groove 53, and snap rings 6 are provided in the first snap ring groove 53 and the second snap ring groove 42, so that the rear portion of the driving rod 5 is axially fixed and circumferentially rotatably connected in the second driving rod mounting hole 41.

As shown in fig. 2-3, an axially extending through hole 54 may be provided in the driving rod 5, and a bone cement overflow hole 55 communicating with the through hole 54 is provided on a side surface of the middle part of the driving rod 5, so that bone cement can penetrate through the bone graft before and after the bone cement, and the bone cement overflow hole 55 facilitates the bone cement, broken bone, artificial bone and the like implantation. The instrument operating hole 51 and the extension drive section 52 may each be hexagonal in shape, in which case the through hole 54 consists of a hexagonal hole at the rear and a circular hole at the front.

As shown in fig. 1-2, 4 and 6-7, the surfaces of the head expanding block 3 opposite to the supporting bodies and the tail expanding block 4 opposite to the supporting bodies may be provided with dovetail bosses 32 and 43 on one surface, and dovetail grooves 11 and 21 matched with the dovetail bosses 32 and 43 are provided on the other surface to stably expand the upper supporting body 1 and the lower supporting body 2, and the dovetail bosses 32 and 43 are matched with the dovetail grooves 11 and 21 to prevent the upper supporting body 1 and the lower supporting body 2 from being separated in the expanding process. In the embodiment shown in the figures, dovetail bosses 32 and 43 are arranged on the surface of the head supporting block 3 opposite to each supporting body and the surface of the tail supporting block 4 opposite to each supporting body, and dovetail grooves 11 and 21 are arranged on the surface of each supporting body opposite to the head supporting block 3 and the surface of each supporting body opposite to the tail supporting block 4.

The connection structure may take various forms which are easily conceivable to those skilled in the art, for example, a screw/rivet/mortise-tenon connection on the side, etc., however, for convenience of implementation, the present invention preferably takes the following forms:

As shown in fig. 6-7 and 10, one of the front surface of the head expanding block 3 and the rear surface of the tail expanding block 4 may be provided with a plugging groove 33, and the other is provided with a plugging boss 44 capable of being matched with the plugging groove 33, and the plugging groove 33 and the plugging boss 44 form a connection structure, that is, the plugging boss 44 of the modular intervertebral implant monomer can be matched with the plugging groove 33 of another modular intervertebral implant monomer with the same structure, so that the combination connection is convenient.

Further, the side walls of the inserting groove 33 and the inserting boss 44 can be provided with concave connecting grooves 34 and 45 which extend vertically and are matched with each other to accommodate the mortise and tenon pin 7, so that the connection strength of the modularized intervertebral implant monomer and another modularized intervertebral implant monomer with the same structure is improved, and the firmness is good. The concave connecting groove 45 on the tail support block 4 can be used for connecting the single body, and can be used as a holding position for holding the implant single body in operation.

As shown in fig. 1-2, 4 and 8-9, the outer side of each support body may be provided with a toothed surface 8, wherein:

The tooth-shaped surface 8 can be provided with stepped dovetail bosses 12 and 22 on one surface and stepped dovetail grooves 81 matched with the stepped dovetail bosses 12 and 22 on the other surface, so that the tooth-shaped surface 8 can be conveniently fixed on each supporting body. In the embodiment shown in the figures, the toothed surface 8 is provided with a stepped dovetail groove 81, and each support body is provided with stepped dovetail bosses 12, 22. Furthermore, the supporting bodies and the toothed surface 8 can be provided with pin holes 13, 23 and 82 which are matched with each other, and the fixing pins 9 are arranged in the pin holes 13, 23 and 82 in a penetrating manner so as to improve the connection strength of the toothed surface 8 and the supporting bodies, and the firmness is good. As shown in fig. 4 and 8, each support body and toothed surface 8 may be provided with a bone grafting window 14, 24, 83 for facilitating bone grafting fusion.

To promote bone grafting fusion, the end surfaces of each toothed surface 8 may be provided with a porous structure. Each toothed surface 8 can be designed for 3D printing so as to conveniently form a porous structure, the porous structure has the advantage of congenital fusion, meanwhile, the shape/size of each toothed surface 8 can be customized individually according to the condition and the requirement of the intervertebral space of a patient, the toothed surface 8 with the corresponding height/angle is designed, the intervertebral space of the patient is perfectly matched, and the self-stability of the implant is enhanced. The material of each tooth surface 8 is preferably a plurality of materials such as titanium alloy, tantalum, niobium-zirconium alloy, or the like.

In summary, the assembly process of the modular intervertebral implant monomer of the present invention is referenced below:

The dovetail grooves 11 and 21 on each support body are matched with the dovetail boss 32 on the head expanding block 3 and the dovetail boss 43 on the tail expanding block 4 respectively, then the clamping ring 6 is arranged in the first clamping ring groove 53 on the driving rod 5, then the clamping ring 6 is compressed and plugged into the tail expanding block 4, the clamping ring 6 falls into the second clamping ring groove 42 of the tail expanding block 4, the smallest module monomer is formed at the moment, the smaller toothed surface 8 (a) is covered on the support bodies 1 and 2 of the modularized intervertebral implant monomer, the stepped dovetail groove 81 of the toothed surface 8 is clamped with the stepped dovetail bosses 12 and 22 of the modularized intervertebral implant monomer, and the (short) fixing pin 9 sequentially penetrates through the pin holes (in particular to be cylindrical) 82 on the toothed surface 8 and the pin holes 13 and 23 on the support bodies 1 and 2, so that a whole body can be formed, and a lumbar vertebra posterior fusion implant (PLIF) can be formed at the moment, see fig. 1-2 and 13).

In another aspect, the present invention provides an intervertebral implant formed by the above-described modular intervertebral implant monomers in combination for use as a lumbar bypass implant (OLIF, see fig. 14), which may specifically have the following three attachment modes.

Connection mode one (front-back side-by-side connection):

As shown in fig. 10, the extension driving section 52 of the modular intervertebral implant unit is inserted and connected into the instrument operation hole 51 of the modular intervertebral implant unit at the front position, wherein the extension driving section is formed by connecting at least two modular intervertebral implant units front and back side by side.

During assembly, the extension driving section 52 of the modular intervertebral implant single body with the rear position is inserted and connected into the instrument operation hole 51 of the modular intervertebral implant single body with the front position, at this time, the insertion boss 44 of the modular intervertebral implant single body with the front position is matched with the insertion groove 33 of the modular intervertebral implant single body with the rear position, so that the concave connecting grooves 34 and 45 are overlapped, and then the (long) mortise and tenon pin 7 is inserted into the concave connecting grooves 34 and 45, so that the front and rear modular intervertebral implant single bodies form an intervertebral implant whole body. At this time, the instrument operation hole 51 of the modular intervertebral implant single body with the rear position is driven, the front and rear implant single bodies can be simultaneously driven to be spread, and the extension driving section 52 of the modular intervertebral implant single body with the front position can slide in the instrument operation hole 51 of the modular intervertebral implant single body with the rear position.

Connection mode two (left and right side by side connection):

As shown in fig. 11, the implant is formed by connecting at least two modularized intervertebral implant monomers side by side, wherein the two modularized intervertebral implant monomers share a toothed surface 8, and the toothed surface 8 covers the supporting bodies 1 and 2 of the two modularized intervertebral implant monomers.

During assembly, the modularized intervertebral implant monomers are arranged left and right, larger toothed surfaces 8 are covered on the supporting bodies 1 and 2 of the modularized intervertebral implant monomers which are arranged side by side, step dovetail grooves 81 of the toothed surfaces 8 are respectively clamped with step dovetail bosses 12 and 22 of the modularized intervertebral implant monomers which are arranged side by side, and a (short) fixing pin 9 sequentially penetrates through pin holes 13 and 23 of the toothed surfaces 8 and the supporting bodies 1 and 2 to be connected into a whole, so that the left and right modularized intervertebral implant monomers form an intervertebral implant whole.

Connection mode three (front, back, left and right side by side connection):

As shown in fig. 12, the extension driving sections 52 of the two modular intervertebral implant monomers with the rear positions are respectively inserted and connected into the instrument operation holes 51 of the two modular intervertebral implant monomers with the front positions, the two modular intervertebral implant monomers with the left and right side by side are connected with each other in parallel, the toothed surfaces 8 are shared by the two modular intervertebral implant monomers with the left and right side by side, and the toothed surfaces 8 are covered on the supporting bodies 1 and 2 of the two modular intervertebral implant monomers with the left and right side by side.

During assembly, the extension driving section 52 of the modular intervertebral implant single body with the back is connected in the instrument operation hole 51 of the modular intervertebral implant single body with the front, at this time, the insertion boss 44 of the modular intervertebral implant single body with the front is matched with the insertion groove 33 of the modular intervertebral implant single body with the back, so that the concave connecting grooves 34 and 45 coincide, then the (long) mortise pin 7 is inserted into the concave connecting grooves 34 and 45, so that the front and back modular intervertebral implant single bodies form a combined body, then the two combined bodies connected in front and back are arranged side by side, the larger toothed surface 8 is covered on the supporting bodies 1 and 2 of the modular intervertebral implant single bodies arranged side by side, the step dovetail groove 81 of the toothed surface 8 is respectively clamped with the step dovetail bosses 12 and 22 of the modular intervertebral implant single body arranged side by side, and then the (short) fixing pin 9 sequentially penetrates through the pin holes 13 and 23 of the toothed surface 8 and the supporting bodies 1 and 2, so that the two combined bodies are connected into a whole intervertebral implant body.

When the device is used, a way form is selected according to the symptoms before operation, the sizes and the numbers of the modularized intervertebral implant monomers, the fixing pins 9, the mortise and tenon pins 7 and the toothed surfaces 8 are selected according to the way form, and the modularized intervertebral implant monomers, the fixing pins 9, the mortise and tenon pins 7 and the toothed surfaces 8 are combined before operation.

The modular intervertebral implant single body of the invention comprises a head expanding block, a tail expanding block and a driving rod, wherein the head expanding block and the tail expanding block are respectively matched with each supporting body of the modular intervertebral implant single body by inclined plane pushing so as to drive each supporting body to expand outwards in the relative movement process of the head expanding block and the tail expanding block, the height of the modular intervertebral implant single body can be randomly adjusted in a certain range, the height specification can reach the optimal implant height of a patient, knocking placement is not needed in the implantation process, the damage to the patient is avoided, and the modular intervertebral implant single body of the invention still has an implant cavity inside the implant after the implantation of the human body is expanded, and bone filling materials such as bone mud, bone blocks, bone powder and the like can be implanted into the implant by using an operation instrument, so that the increased implant space after the implantation is fully utilized, the bone implantation effect is fully improved in the implant, the bone implantation fusion in the later stage is facilitated, the fixation of the fusion device is good, and the clinical requirements are met; the rear end of the driving rod is provided with an instrument operation hole, the front end of the driving rod is provided with an extension driving section which extends to the outer side of the head expanding block and can be matched with the instrument operation hole, so that the extension driving section of the modularized intervertebral implant single body can be matched with (i.e. inserted into and driven by) another modularized intervertebral implant single body with the same structure, and the modularized intervertebral implant single body is provided with a connecting structure which is used for being connected with another modularized intervertebral implant single body with the same structure in a front-back/left-right side-by-side manner.

The invention relates to the technical field of spinal fusion internal fixation surgery, in particular to a modularized lumbar intervertebral implant which is in a spreadable form, is convenient for the selection of the height in the clinical operation, meets different lumbar access forms through single or mortise-tenon structure combination, can reduce the production cost through modularized structure design, reduces the development difficulty, can form a multi-single combination form, can also improve the strength of the implant, and can enhance the stability of the implant.

The invention provides a method for adjusting the height of a vertebral segment in a certain range, which can meet different clinical access requirements by randomly combining or singly using the single intervertebral implant with the smallest module, has the advantage of congenital fusion due to the fact that the toothed surface is made of 3D printing materials, can perfectly recover the height and tension of the vertebral segment by using the expanding force of the intervertebral implant after being implanted into a human body, realizes decompression, recovers the physiological curvature of the vertebra, increases the osseous fusion of an intervertebral fusion device, and ensures the stability of the vertebral column.

The modular intervertebral implant monomer is the minimum module body, and the minimum module body is fixed by a short fixing pin 9 after being matched with a smaller dentate surface 8 (fig. 8 (a)), so as to form the intervertebral fusion implant for lumbar vertebra posterior approach; however, when the minimum module bodies are matched with the larger toothed surfaces 8 (fig. 8 (b)) in a pairwise parallel manner, the minimum module bodies are fixed through the short fixing pins 9, the fixed monomers are spliced in a head-to-tail serial connection mode, after the long mortise and tenon pins 7 are inserted, front-to-tail monomer fixation is realized, four monomers can be spliced to form a large monomer, at the moment, the intervertebral implant is composed of 4 modularized intervertebral implant monomers, and the size of the intervertebral implant is just enough to meet the clinical requirement for lumbar side-channel fusion operation.

While the foregoing is directed to the preferred embodiments of the present invention, 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 invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.

Claims (10)

1. The utility model provides a modularization intervertebral implant monomer which characterized in that includes the structure of strutting, the top and the below of strutting the structure are equipped with support body and lower support body respectively, wherein:

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

The rear end of the driving rod is provided with an instrument operation hole, the front end of the driving rod is provided with an extension driving section which extends to the outer side of the head expanding block and can be matched with the instrument operation hole, and the modularized intervertebral implant monomer is provided with a connecting structure which is used for being connected with another modularized intervertebral implant monomer of the same structure in a front-back/left-right side-by-side manner.

2. The modular intervertebral implant unit of claim 1 wherein the head distraction block has a first drive rod mounting hole and the tail distraction block has a second drive rod mounting hole, the front portion of the drive rod is threaded into the first drive rod mounting hole, and the rear portion of the drive rod is axially fixed and circumferentially rotatable within the second drive rod mounting hole.

3. The modular intervertebral implant unit of claim 2 wherein the head spreader block and each support and the tail spreader block have opposed surfaces, one of which has a dovetail boss and the other has a dovetail groove that mates with the dovetail boss;

And/or the rear part of the driving rod is provided with a first clamping ring groove, a second clamping ring groove is arranged in the second driving rod mounting hole at a position corresponding to the first clamping ring groove, and clamping rings are arranged in the first clamping ring groove and the second clamping ring groove;

And/or, the driving rod is internally provided with an axially extending through hole, and the side surface of the middle part of the driving rod is provided with a bone cement overflow hole communicated with the through hole;

and/or, the instrument operation hole and the extension drive section are both hexagonal.

4. A modular intervertebral implant unit as recited in any one of claims 1-3 wherein one of the anterior surface of the cephalad distracting block and the posterior surface of the caudal distracting block is provided with a mating recess and the other is provided with a mating boss mateable with the mating recess, the mating recess and mating boss forming the connection structure.

5. The modular intervertebral implant unit of claim 4 wherein the sidewalls of the insertion groove and insertion boss are each provided with a vertically extending female coupling slot that cooperate to receive a mortise and tenon pin.

6. A modular intervertebral implant unit as claimed in any one of claims 1-3 wherein the outer side of each support is provided with a toothed surface wherein:

the tooth-shaped surface is provided with a step dovetail boss on one surface and a step dovetail groove matched with the step dovetail boss on the other surface;

and/or pin holes matched with each other are formed in each support body and the toothed surface, and fixing pins are arranged in the pin holes in a penetrating mode.

7. The modular intervertebral implant unit of claim 6 wherein each support and toothed surface is provided with a bone grafting window;

And/or, each toothed surface is a 3D printing design;

and/or the material of each tooth-shaped surface is titanium alloy or tantalum or niobium-zirconium alloy;

And/or the end face of each toothed surface is provided with a porous structure.

8. An intervertebral implant, characterized in that the intervertebral implant is formed by connecting at least two modularized intervertebral implant monomers in a front-back side-by-side manner, and an extension driving section of the modularized intervertebral implant monomer positioned at the back is spliced in an instrument operation hole of the modularized intervertebral implant monomer positioned at the front.

9. An intervertebral implant, characterized in that the intervertebral implant is formed by connecting at least two modularized intervertebral implant monomers according to any one of claims 6-7 side by side left and right, the two modularized intervertebral implant monomers share the toothed surface, and the toothed surface covers the supporting bodies of the two modularized intervertebral implant monomers.

10. An intervertebral implant, characterized in that the intervertebral implant is formed by connecting at least four modularized intervertebral implant monomers in a front-back side, a left-right side and a side-by-side manner, extension driving sections of two modularized intervertebral implant monomers at the back are respectively inserted and connected into instrument operation holes of two modularized intervertebral implant monomers at the front, the two modularized intervertebral implant monomers connected in a side-by-side manner share the toothed surface, and toothed surface covers are arranged on supporting bodies of the two modularized intervertebral implant monomers connected in a side-by-side manner.