CN216754579U - Bone plate assembly - Google Patents

Abstract

The utility model provides a bone plate assembly for use with a bone structure, wherein the bone plate assembly comprises: the first arc-shaped plate body protrudes towards the direction far away from the bone structure; the second arc-shaped plate body is connected with the first arc-shaped plate body and protrudes towards the direction of the bone structure, wherein the second arc-shaped plate body is connected to the middle point of one side edge of the first arc-shaped plate body; and the filling fixing piece is connected with the first arc-shaped plate body and/or the second arc-shaped plate body. The technical scheme of this application has solved the relatively poor problem of fixed effect when the bone piece fragment among the correlation technique is fixed to whole bone effectively.

Description

Bone plate assembly

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a bone plate assembly.

Background

The tibia is the main bearing bone in the leg bone, and the upper end of the tibia and the lower end of the femur form a knee joint. The surface of the tibia contacted with the lower end of the femur is a tibial plateau. Tibial plateau fractures are common intra-articular fractures in clinical settings, and are common in middle-aged and young people suffering from high-energy injuries. Because the fracture form is complicated and changeable, the tibial plateau fracture is always a difficult point of traumatic orthopedic treatment, and particularly the treatment of the complicated tibial plateau fracture has higher complication and disability rate. The clinical treatment is troublesome. The treatment of the tibial plateau fracture aims to restore the smooth joint surface and the force line of the lower limb, firmly fix the fracture block and avoid long-term complications such as postoperative traumatic arthritis, joint stiffness and the like. In patients with tibial fractures, proximal tibial stem fractures occur with proximal tibial facet collapse fractures.

In the related art, the treatment method commonly adopted in the cases at present is to adopt the connection and fixation of a lateral bone fracture plate and a bone screw after the anterolateral indirect reduction. Bone screw passes the bone piece of articular surface platform collapse fracture through the coaptation board alone and fixes to whole bone, and the treatment scheme is easy to operate, but has the defect of fixed insecure, and can cause certain reduction to lose when doing exercises to postoperative rehabilitation knee bending. Resulting in unstable joint positions.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide a bone fracture plate assembly to solve the problem of poor fixing effect when bone fragment is fixed on the whole bone in the related art.

In order to achieve the above objects, the present invention provides a bone plate assembly for cooperation with a bone structure, the bone plate assembly comprising: the first arc-shaped plate body protrudes towards the direction far away from the bone structure; the second arc-shaped plate body is connected with the first arc-shaped plate body and protrudes towards the direction of the bone structure, wherein the second arc-shaped plate body is connected to the middle point of one side edge of the first arc-shaped plate body; and the filling fixing piece is connected with the first arc-shaped plate body and/or the second arc-shaped plate body.

Further, the filling fixing piece is connected with the first arc-shaped plate body and the second arc-shaped plate body, the filling fixing piece comprises an expansion piece and an expansion pin installed in the expansion piece, the expansion piece is detachably connected with the first arc-shaped plate body, and the expansion pin is detachably connected with the second arc-shaped plate body and can drive the expansion piece to expand.

Further, the expansion part comprises a connecting portion and an expansion portion connected with the connecting portion, a first thread structure is arranged on the outer wall of the connecting portion and connected with the bone structure, the expansion portion comprises a plurality of expansion lobes which are arranged at intervals, the expansion pin is located inside the expansion portion, and the expansion pin can push the expansion portion to enable the distance between the adjacent expansion lobes to be increased.

Further, the outer surface of inflation portion is provided with the cellular structure layer.

Furthermore, the inside of connecting portion is provided with first screw hole, and the first end of expansion pin is provided with second helicitic texture, and second helicitic texture and first screw hole spiro union cooperation, in the direction of expansion pin first end to second end, the diameter of expansion pin is crescent.

Furthermore, a third thread structure is arranged at the second end of the expansion pin, a second thread hole is formed in the second arc-shaped plate body, and the third thread structure is in threaded connection with the second thread hole.

Furthermore, the first end of the first arc-shaped plate body is provided with a first mounting hole, the second end of the first arc-shaped plate body is provided with a second mounting hole, a third mounting hole is formed in the expansion portion, a fourth mounting hole is formed in the expansion pin, the first mounting hole and the second mounting hole are correspondingly arranged, the axes of the first mounting hole and the second mounting hole are collinear and perpendicular to the length direction of the expansion portion, the third mounting hole and the fourth mounting hole are correspondingly arranged, the bone plate assembly further comprises a connecting nail, and the connecting nail sequentially penetrates through the first mounting hole, the third mounting hole, the fourth mounting hole and the second mounting hole.

Further, the length of the fourth mounting hole is greater than the length of the third mounting hole.

Further, still be provided with a plurality of first connecting holes on the first arc plate body, a plurality of first connecting holes array is arranged to be located the middle part of first arc plate body, be provided with a plurality of second connecting holes on the second arc plate body.

Further, the distance between the one end of the second arc-shaped plate body far away from the first arc-shaped plate body and the two ends of the first arc-shaped plate body is equal.

By applying the technical scheme of the utility model, the first arc-shaped plate body protrudes towards the direction far away from the bone structure, and the second arc-shaped plate body is connected with the first arc-shaped plate body and protrudes towards the direction of the bone structure. The second arc-shaped plate body is connected with the middle point of the side edge of the first arc-shaped plate body. The filling fixing piece is connected with the first arc-shaped plate body and/or the second arc-shaped plate body. Through the arrangement, the filling fixing piece can improve the fixing effect of the first arc-shaped plate body and the second arc-shaped plate body, specifically, the filling fixing piece is connected to the whole bone, and then the first arc-shaped plate body and the second arc-shaped plate body are connected to the filling fixing piece, so that the first arc-shaped plate body and the second arc-shaped plate body can effectively fix bone fragments; simultaneously because first arc plate body and second arc plate body are the arc, make first arc plate body and second arc plate body can cooperate with bone structure effectively like this to realize the parcel effect and the supporting role to bone structure, can further improve the holistic fixed effect of coaptation board subassembly like this, and can guarantee that the contact of bone piece and whole bone is better, and then make the healing effect better. Therefore, the technical scheme of the application effectively solves the problem of poor fixing effect when bone fragment fragments in the related art are fixed on the whole bone.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:

FIG. 1 illustrates a perspective view of an embodiment of a bone plate assembly according to the present invention;

FIG. 2 illustrates a side schematic view of the bone plate assembly of FIG. 1;

FIG. 3 illustrates a perspective view of the first and second arcuate plates of the bone plate assembly of FIG. 1;

FIG. 4 is a schematic view of the fill fixture of the bone plate assembly of FIG. 1;

FIG. 5 shows a partial structural cross-sectional view of the fill fixture of FIG. 4;

figure 6 shows a schematic view of the construction of the expansion pin of the filling fixture of figure 4.

Wherein the figures include the following reference numerals:

10. a first arc-shaped plate body; 11. a first mounting hole; 12. a second mounting hole; 13. a first connection hole; 20. a second arc-shaped plate body; 21. a second threaded hole; 22. a second connection hole; 30. filling the fixing piece; 31. an expansion member; 311. a connecting portion; 3111. a first thread formation; 3112. a first threaded hole; 312. an expansion part; 3121. an expansion valve; 3122. a third mounting hole; 32. an expansion pin; 321. a second thread formation; 322. a third thread formation; 323. a fourth mounting hole; 40. and (5) connecting nails.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the utility model, its application, or uses. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In order to improve the fixation of the bone plate assembly after implantation, as shown in fig. 1, 2 and 4, in the present embodiment, the bone plate assembly, in cooperation with the bone structure, includes: a first arc-shaped plate body 10, a second arc-shaped plate body 20 and a filling and fixing piece 30. The first plate 10 is convex in a direction away from the bone structure. The second arc plate 20 is connected to the first arc plate 10, and the second arc plate 20 protrudes toward the direction of the bone structure, wherein the second arc plate 20 is connected to a midpoint of one side of the first arc plate 10. The fill fastener 30 is attached to the first curved plate 10 and/or the second curved plate 20.

With the technical solution of this embodiment, the first arc-shaped plate 10 protrudes toward a direction away from the bone structure, and the second arc-shaped plate 20 is coupled to the first arc-shaped plate 10 and protrudes toward the bone structure. The second curved plate body 20 is connected to the first curved plate body 10 at the midpoint of the side edge. The filling fixture 30 is connected to the first curved plate body 10 and the second curved plate body 20. Through the arrangement, the filling fixing member 30 can improve the fixing effect of the first arc-shaped plate body 10 and the second arc-shaped plate body 20, specifically, the filling fixing member 30 is connected to the whole bone, and then the first arc-shaped plate body 10 and the second arc-shaped plate body 20 are connected to the filling fixing member 30, so that the first arc-shaped plate body 10 and the second arc-shaped plate body 20 can effectively fix bone fragments; simultaneously because first arc plate body 10 and second arc plate body 20 are the arc, make first arc plate body 10 and second arc plate body 20 cooperate with bone structure effectively like this to realize the parcel effect and the supporting role to bone structure, can further improve the holistic fixed effect of coaptation board subassembly like this, and can guarantee that bone piece fragment is better with the contact of whole bone, and then make the healing effect better. Therefore, the technical scheme of the embodiment effectively solves the problem of poor fixing effect when the bone fragment in the related art is fixed on the whole bone.

It should be noted that the first arc-shaped plate 10 of the present embodiment is a C-shaped hoop arc-shaped anatomical structure, the arc is 140 ° to 170 °, preferably about 150 °, and the radius is about 21 mm. Can carry out the bone laminating, realize better osseointegration effect, it includes coaptation board plate body, preceding outside wing fixed plate, back outside wing fixed plate triplex. The front side wing fixing plate is attached to the front lateral bone surface of the tibial plateau. The width is about 12mm, the thickness is about 2.5mm, a first mounting hole 11 is arranged on the plate body, and the distance between the first mounting hole 11 and the edge of the plate body is 5-10 mm. Preferably 8 mm. The posterolateral wing fixing plate is attached to the posterolateral bone surface, the width of the posterolateral wing fixing plate is about 10mm, the thickness of the posterolateral wing fixing plate is about 2.5mm, a second mounting hole 12 is formed in the posterolateral wing fixing plate, and the distance between the second mounting hole 12 and the edge of the plate body is 5-10mm, preferably 8 mm. The axial directions of the first mounting hole 11 and the second mounting hole 12 are the same, and the same screw can simultaneously pass through the two holes to be fixed and limited with the third mounting hole 3122 and the fourth mounting hole 323 on the filling fixing member 30. In addition, the fixing plate is arranged between the front and the back outer side of the bone fracture plate. 6 universal locking screw hole sites (i.e. first connection holes 13) are designed. The included angle between the axis of the screw and the circular line of the arc bone fracture plate is 6-30 degrees. The distance between the two holes is about 7.5 mm. The locking direction of the screw can realize 10-degree threaded locking around the axis by 360 degrees in the up, down, left and right directions, and has certain adjustability. The top end of the plate body (the second arc-shaped plate body 20) is a pointed end with a negative angle, and can be smoothly inserted along the bone surface. The first arc-shaped plate body 10, the second arc-shaped plate body 20, the filling fixing piece 30, the collapsed bones and the healthy bones are more stable and firmer, and the situations of reduction, loss and the like are not easy to happen.

In order to improve the stability of the first and second arc-shaped panels, as shown in fig. 1 to 3, in the present embodiment, the filling fastener 30 is connected to both the first arc-shaped panel 10 and the second arc-shaped panel 20, the filling fastener 30 includes an expansion member 31 and an expansion pin 32 installed in the expansion member 31, the expansion member 31 is detachably connected to the first arc-shaped panel 10, and the expansion pin 32 is detachably connected to the second arc-shaped panel 20 and can drive the expansion member 31 to expand. The filling fastener 30 is connected to both the first curved plate 10 and the second curved plate 20, so that the filling fastener 30 is more stable in connection with the first curved plate 10 and the second curved plate 20. The expansion member 31 can be expanded by the expansion pin 32 to be fixed to the bone structure. Specifically, in this embodiment, the fixation of the bone plate assembly is achieved by implanting the expansion member 31 into the bone structure through the first thread structure 3111, then attaching the second arc-shaped plate 20 to the expansion member 31 through the expansion pin 32, and finally attaching the expansion member 31 to the first arc-shaped plate 10 through the connection structure.

In view of the fixing effect of the filling fixture, as shown in fig. 1 and 2 and fig. 4 to 6, in the present embodiment, the expansion member 31 includes a connection portion 311 and an expansion portion 312 connected to the connection portion 311, a first thread structure 3111 is provided on an outer wall of the connection portion 311, the first thread structure 3111 is connected to a bone structure, the expansion portion 312 includes a plurality of expansion lobes 3121 arranged at intervals, an expansion pin 32 is located inside the expansion portion 312, and the expansion pin 32 can push the expansion portion 312 to increase a distance between the adjacent expansion lobes 3121. The expansion valve 3121 can be opened to make the contact with the bone structure more tight, so as to improve the connection strength between the expansion member and the bone structure.

As shown in fig. 1 and 2 and fig. 4 to 6, in the present embodiment, the outer surface of the expansion part 312 is provided with a microporous structure layer. The microporous structure layer can contact with bone structure better, and then make bone structure can grow into in the microporous structure layer to realize biological fixed, such fixed mode is simple more high-efficient, and fixed effect is better simultaneously. The microporous structure layer is a microporous structure which is printed in a 3D mode and facilitates bone cell growth, the microporous structure is a mutually communicated multidirectional microporous structure, the thickness is about 2mm, the diameter of each pore is 800 micrometers, the pores are beneficial to bone cell crawling growth, and the bone surface can be fused after operation to be subjected to bone fusion with the physiological bone structure so as to achieve long-term stability.

In the embodiment not shown in the figures, the bone cement is poured into the interior of the expansion element, and the bone cement is ejected from the gap of the expansion flap while the expansion pin pushes the expansion flap, so that the fixation can be effectively realized.

In order to facilitate the connection of the expansion pin and the better support of the expansion member by the expansion pin, as shown in fig. 1 and 2 and fig. 4 to 6, in the present embodiment, a first threaded hole 3112 is provided inside the connection portion 311, a second threaded structure 321 is provided at the first end of the expansion pin 32, the second threaded structure 321 is in threaded engagement with the first threaded hole 3112, and the diameter of the expansion pin 32 is gradually increased in the direction from the first end to the second end of the expansion pin 32. Due to the gradual diameter increase of the expansion pin 32 from the first end to the second end, when the expansion pin 32 is rotated into the expansion part 31, the first end of the expansion pin 32 is located in the expansion part 31, the second end of the expansion pin 32 is located outside the expansion part 31, and the second end of the expansion pin 32 can push the expansion flap 3121 to make the expansion flap 3121 expand.

In an embodiment not shown in the figures, the anchoring is also achieved by the expansion pin being implanted first on the bone structure and then connected to the expansion pin by means of an expansion element.

As shown in fig. 1 and 2 and fig. 4 to 6, in the present embodiment, the second end of the expansion pin 32 is provided with a third thread structure 322, the second arc-shaped plate body 20 is provided with a second threaded hole 21, and the third thread structure 322 is in threaded engagement with the second threaded hole 21. The above arrangement enables the fixing of the expansion pin 32 and the second arc-shaped plate body 20 to be effectively achieved.

As shown in fig. 1 and 2 and fig. 4 to 6, in the present embodiment, a first end of the first arc-shaped plate body 10 is provided with a first mounting hole 11, a second end of the first arc-shaped plate body 10 is provided with a second mounting hole 12, the expansion portion 312 is provided with a third mounting hole 3122, the expansion pin 32 is provided with a fourth mounting hole 323, the first mounting hole 11 and the second mounting hole 12 are correspondingly arranged, the axes of the first mounting hole 11 and the second mounting hole 12 are collinear and perpendicular to the length direction of the expansion portion 312, the third mounting hole 3122 and the fourth mounting hole 323 are correspondingly arranged, the bone plate assembly further includes a connecting nail 40, and the connecting nail 40 sequentially passes through the first mounting hole 11, the third mounting hole 3122, the fourth mounting hole 323 and the second mounting hole 12. The above-mentioned connecting nail 40 can effectively fix the filling fixture 30 on the first arc-shaped plate 10, which is a simple way. Meanwhile, the filling fixture 30 is arranged in a swinging way relative to the first arc-shaped plate body 10, so that the connection position of the filling fixture and the bone structure can be adjusted, and the connection effect can be improved.

As shown in fig. 1 and 2 and 4 to 6, in the present embodiment, the length of the fourth mounting hole 323 is greater than the length of the third mounting hole 3122. The above arrangement ensures that the coupling nail 40 can be accurately inserted through the fourth mounting hole 323.

In order to further improve the connection effect of the first arc-shaped plate body and the second arc-shaped plate body, as shown in fig. 1 to 3, in this embodiment, a plurality of first connection holes 13 are further disposed on the first arc-shaped plate body 10, the plurality of first connection holes 13 are arranged in an array manner and located in the middle of the first arc-shaped plate body 10, and a plurality of second connection holes 22 are disposed on the second arc-shaped plate body 20. The arrangement of the plurality of first connection holes 13 and the plurality of second connection holes 22 described above is to further improve the effect of connection, and specifically, in the present embodiment, the fastener is connected to the bone structure through the plurality of first connection holes 13 and the plurality of second connection holes 22.

Of course, in an embodiment not shown in the figures, bone cement may also be poured into the plurality of first connection holes and the plurality of second connection holes to achieve fixation.

As shown in fig. 1 to 3, in the present embodiment, the distance between one end of the second arc-shaped plate body 20 away from the first arc-shaped plate body 10 and the two ends of the first arc-shaped plate body 10 is equal. The above arrangement allows the first and second curved plates 10 and 20 to be positioned perpendicular to each other and at the bisector, which allows the first and second curved plates 10 and 20 to better contact the bone structure.

As shown in fig. 1-6, the bone plate assembly of the present embodiment effectively achieves a gimbaled, locked proximal-lateral tibial fixation. The bone plate component is composed of a first arc-shaped plate body 10, a second arc-shaped plate body 20 and a filling fixing piece 30 for reduction and fixation of fracture. The first arc-shaped plate body 10 comprises an anatomic encircling structure and front and rear two side wing fixing plates, a first mounting hole 11 and a second mounting hole 12 are formed in the far side of each side wing fixing plate, and a connecting nail 40 can penetrate through the first mounting hole 11 and the second mounting hole 12 to be limited and fixed with the filling fixing piece 30; fill mounting 30 and print through 3D by titanium alloy material and make, its front end is first helicitic texture 3111, can be stable fix with healthy bone structure, the rear end is the inflation portion, the surface is the microporous structure layer through 3D printing, can cooperate expansion pin 32 to steadily fix on whole bone the bone piece of collapsing, surface micropore design can promote bone growth, increase the fracture, the stability of bone piece and whole bone collapse, and fill third mounting hole 3122 and fourth mounting hole 323 accessible on the mounting 30 and connect nail 40 and connect, expansion pin 32 tail end is third helicitic texture 322. Can be locked to the second arc-shaped plate body 20. The fixation between the first arc-shaped plate body 10, the second arc-shaped plate body 20 and the filling and fixing member 30 and the physiological bone is more stable, and the reduction and the loss are not easy to cause when the postoperative rehabilitation exercise is carried out.

The bone plate component of the embodiment is used for performing the external operation incision in the operation process, protecting important vascular nerves, exposing fracture parts, performing joint reduction, cleaning operation parts, determining the specifications and the number of the external bone plate of the tibial plateau and screws required in the operation, implementing the implantation operation, implanting the filling fixing component 30, the first arc-shaped plate body 10 and the second arc-shaped plate body 20, and fixing the bone plate component to the operation required position to realize the operation purpose.

The first and second arc-shaped plate bodies 10 and 20 of the present embodiment are made of medical metals, including but not limited to titanium and titanium alloys, cobalt alloys, stainless steel, tantalum metals, and magnesium alloys, which are specified in international standards of ISO-5830 series, and the biocompatibility of the medical metals is proved by years of domestic and foreign practices for orthopedic implantation applications.

In the description of the present invention, it is to be understood that the directions or positional relationships indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the directions or positional relationships shown in the drawings, and are for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …", "above … …", "above … …", "above", and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A bone plate assembly for use in association with a bone structure, said bone plate assembly comprising:

the first arc-shaped plate body (10), the first arc-shaped plate body (10) protrudes towards the direction far away from the bone structure;

a second arc-shaped plate (20) connected to the first arc-shaped plate (10), the second arc-shaped plate (20) protruding towards the bone structure, wherein the second arc-shaped plate (20) is connected to a midpoint of one side of the first arc-shaped plate (10);

a filling fixture (30), wherein the filling fixture (30) is connected with the first arc-shaped plate body (10) and/or the second arc-shaped plate body (20).

2. The bone plate assembly of claim 1, wherein the filler fixation member (30) is connected to both the first curved plate body (10) and the second curved plate body (20), the filler fixation member (30) including an expansion member (31) and an expansion pin (32) mounted in the expansion member (31), the expansion member (31) being detachably connected to the first curved plate body (10), the expansion pin (32) being detachably connected to the second curved plate body (20) and being capable of driving the expansion member (31) to expand.

3. Bone plate assembly according to claim 2, characterized in that the expansion member (31) comprises a connecting portion (311) and an expansion portion (312) connected to the connecting portion (311), in that a first thread arrangement (3111) is provided on an outer wall of the connecting portion (311), in that the first thread arrangement (3111) is connected to a bone structure, in that the expansion portion (312) comprises a plurality of spaced apart expansion lobes (3121), in that the expansion pin (32) is located inside the expansion portion (312), in that the expansion pin (32) can be pushed against the expansion portion (312) in order to increase the distance between adjacent expansion lobes (3121).

4. The bone plate assembly according to claim 3, characterized in that the outer surface of the expanded portion (312) is provided with a microporous structural layer.

5. A bone plate assembly according to claim 3, characterised in that the interior of the connection portion (311) is provided with a first threaded hole (3112), that the first end of the expansion pin (32) is provided with a second threaded formation (321), and that the second threaded formation (321) and the first threaded hole (3112) are in threaded engagement, the diameter of the expansion pin (32) increasing progressively in the direction from the first end to the second end of the expansion pin (32).

6. The bone plate assembly according to claim 3, characterized in that the second end of the expansion pin (32) is provided with a third threaded structure (322), the second arcuate plate (20) is provided with a second threaded hole (21), and the third threaded structure (322) and the second threaded hole (21) are threadedly engaged.

7. The bone plate assembly according to claim 3, wherein a first mounting hole (11) is formed at a first end of the first arc-shaped plate body (10), a second mounting hole (12) is formed at a second end of the first arc-shaped plate body (10), a third mounting hole (3122) is formed on the expansion portion (312), a fourth mounting hole (323) is formed on the expansion pin (32), the first mounting hole (11) and the second mounting hole (12) are correspondingly formed, the axes of the first mounting hole (11) and the second mounting hole (12) are collinear and perpendicular to the length direction of the expansion portion (312), the third mounting hole (3122) and the fourth mounting hole (323) are correspondingly formed, the bone plate assembly further comprises a connection nail (40), and the connection nail (40) sequentially passes through the first mounting hole (11), the third mounting hole (3122), and the connection nail (40), The fourth mounting hole (323) and the second mounting hole (12).

8. The bone plate assembly according to claim 7, wherein the length of the fourth mounting hole (323) is greater than the length of the third mounting hole (3122).

9. Bone plate assembly according to any of claims 1 to 8, characterized in that a plurality of first connecting holes (13) are provided in the first plate (10), a plurality of first connecting holes (13) are arranged in an array and located in the middle of the first plate (10), and a plurality of second connecting holes (22) are provided in the second plate (20).

10. Bone plate assembly according to one of claims 1 to 8, characterized in that the end of the second curved plate (20) remote from the first curved plate (10) is equidistant from the two ends of the first curved plate (10).

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