CN112386373A

CN112386373A - Intramedullary fusion device and femoral prosthesis component with same

Info

Publication number: CN112386373A
Application number: CN202011349410.9A
Authority: CN
Inventors: 王彩梅; 张卫平
Original assignee: Beijing AK Medical Co Ltd
Current assignee: Beijing AK Medical Co Ltd
Priority date: 2020-11-26
Filing date: 2020-11-26
Publication date: 2021-02-23

Abstract

The invention provides an intramedullary fusion device and a femoral prosthesis component with the same, wherein the intramedullary fusion device comprises: a first arc-shaped plate; the first end of the second arc-shaped plate is pivotally connected with the first end of the first arc-shaped plate; the adjusting structure is arranged between the second end of the first arc-shaped plate and the second end of the second arc-shaped plate, so that a positioning opening with adjustable radial size is formed between the first arc-shaped plate and the second arc-shaped plate. The technical scheme of this application has solved when using the tip of the fixed thighbone false body of a large amount of bone cement among the correlation technique effectively, causes the problem of secondary damage to the patient.

Description

Intramedullary fusion device and femoral prosthesis component with same

Technical Field

The invention relates to the field of medical instruments, in particular to an intramedullary fusion device and a femoral prosthesis assembly with the same.

Background

The stem of the human femoral medullary canal is usually large at the proximal end and large at the distal end, with a smaller diameter in the middle part, which is called the throat. The normal artificial joint replacement is characterized in that the diameter between the proximal large opening and the proximal narrow part is gradually reduced, a femoral prosthesis with a similar structure is inserted, and the femoral prosthesis is stably fixed, so that the prosthesis replacement of the femoral part is completed.

When the proximal end of the femoral medullary cavity is seriously damaged, the proximal end of the femoral medullary cavity cannot effectively fix the femoral prosthesis, the lengthened femoral prosthesis is conventionally adopted for replacement, only the narrow part can fix the femoral prosthesis at the moment, the diameter of the distal end of the femoral medullary cavity is larger than that of the narrow part, the end part of the femoral prosthesis is easy to shake, and a large amount of bone cement can only be filled clinically. The end of the femoral prosthesis is easily deviated when a large amount of bone cement is used for fixing, the clinical expectation is poor, and simultaneously, the large amount of bone cement can cause complications and cause secondary damage to patients.

Disclosure of Invention

The invention mainly aims to provide an intramedullary fusion device and a femoral prosthesis component with the same, so as to solve the problem of secondary injury to a patient when a large amount of bone cement is used for fixing the end part of a femoral prosthesis in the related art.

In order to achieve the above object, the present invention provides an intramedullary cage comprising: a first arc-shaped plate; the first end of the second arc-shaped plate is pivotally connected with the first end of the first arc-shaped plate; the adjusting structure is arranged between the second end of the first arc-shaped plate and the second end of the second arc-shaped plate, so that a positioning opening with adjustable radial size is formed between the first arc-shaped plate and the second arc-shaped plate.

Further, adjust the structure and include first regulation tooth and with first regulation tooth complex second regulation tooth, first regulation tooth sets up in the outside of the second end of first arc, the second is adjusted the tooth and is set up the inboard at the second end of second arc, the second is adjusted the tooth and is included a plurality of first tooth portions, wherein, when first regulation tooth cooperates with different first tooth portions, the second end of first arc is in different regulation positions for the second end of second arc.

Further, the first adjustment tooth includes a plurality of second tooth portions.

Further, notches are arranged at positions of the first arc-shaped plate corresponding to the first tooth parts.

Furthermore, the first arc-shaped plate is connected with the second arc-shaped plate through a pivoting structure, the axis of the pivoting structure is parallel to the axis of the positioning opening, the pivoting structure comprises a shaft sleeve and a pivot shaft penetrating in the shaft sleeve, the shaft sleeve is arranged on the first arc-shaped plate, and the pivot shaft is arranged on the second arc-shaped plate.

Further, the shaft sleeve and the pivot are in clearance fit.

Further, the first arc-shaped plate comprises a first arc-shaped body and a first anti-skidding structure arranged on the outer side of the first arc-shaped body; the first arc-shaped body is of a porous structure; the first anti-slip structure comprises a first arc-shaped groove or a third tooth part, wherein the length of the third tooth part extends along the axial direction of the positioning opening.

Further, the second arc-shaped plate comprises a second arc-shaped body and a second anti-skidding structure arranged on the inner side of the second arc-shaped body; the second arc-shaped body is of a porous structure; the second anti-slip structure comprises a second arc-shaped groove or a fourth tooth part, wherein the length of the fourth tooth part extends along the axial direction of the positioning opening.

According to another aspect of the present invention, there is provided a femoral prosthesis assembly comprising a femoral prosthesis and an intramedullary cage, an end of the femoral prosthesis being arranged in the intramedullary cage, the intramedullary cage being as described above.

Furthermore, a filling space is defined among the cavity wall of the femoral medullary cavity, the femoral prosthesis and the intramedullary fusion device, and the femoral prosthesis component also comprises a bone cement layer arranged in the filling space.

By applying the technical scheme of the invention, the intramedullary fusion device comprises: first arc, second arc and regulation structure. The first end of the second arcuate panel is pivotally connected to the first end of the first arcuate panel. The adjusting structure is arranged between the second end of the first arc-shaped plate and the second end of the second arc-shaped plate, so that a positioning opening with adjustable radial size is formed between the first arc-shaped plate and the second arc-shaped plate. The second end of first arc can adjust the position of the second end of first arc on the second end of second arc through adjusting the structure for the radial dimension of locating hole diminishes relatively. At this time, the intramedullary fusion cage passes through the narrow part of the femoral medullary cavity, and after the intramedullary fusion cage is implanted, the position of the second end of the first arc-shaped plate on the second end of the second arc-shaped plate is adjusted, so that the radial dimension of the positioning opening is relatively enlarged. At this moment, the intramedullary fusion cage can fill a part of space of the far end of the femoral medullary cavity, meanwhile, the first arc plate and the second arc plate are attached to the cavity wall of the femoral medullary cavity, the first arc plate and the second arc plate are mutually extruded with the cavity wall of the femoral medullary cavity and tightly press-fit to generate enough friction damping, and the first arc plate and the second arc plate can support the bone of the femoral medullary cavity. When the radial dimension of location mouth was grown relatively, under the circumstances of location mouth was worn out to femoral prosthesis's tip, femoral prosthesis's tip card had restricted femoral prosthesis's swing range in the location mouth, and then avoided femoral prosthesis's the rocking in the femoral medullary cavity, can fix femoral prosthesis's tip to suitable position to fix femoral prosthesis to the femoral medullary cavity effectively. Therefore, a large amount of bone cement in the related technology is not needed, and secondary damage to a patient is avoided. Therefore, the technical scheme of this application has solved effectively and has used a large amount of bone cement when fixing the tip of femoral prosthesis among the relevant art, causes the problem of secondary injury to the patient.

Drawings

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

fig. 1 shows a schematic perspective view of an embodiment of an intramedullary cage according to the present invention;

fig. 2 shows a schematic side view from a first perspective of the intramedullary cage of fig. 1;

fig. 3 shows a schematic side view from a second perspective of the intramedullary cage of fig. 1;

FIG. 4 shows a schematic top view of the intramedullary cage of FIG. 1 when expanded;

FIG. 5 shows a schematic top view of the intramedullary cage of FIG. 1 with the locating port relatively reduced;

FIG. 6 shows a schematic top view of the intramedullary cage of FIG. 1 with the locating port relatively enlarged;

FIG. 7 illustrates a perspective view of the first arcuate plate of FIG. 1;

FIG. 8 shows a side schematic view of the first arcuate plate of FIG. 7;

FIG. 9 shows a side view schematic of the second arcuate plate of FIG. 1;

FIG. 10 shows a schematic cross-sectional view of the second arcuate plate of FIG. 9;

FIG. 11 shows a cross-sectional schematic view of an embodiment of a femoral prosthetic component according to the present invention; and

fig. 12 shows an enlarged schematic view at a of the femoral prosthetic component of fig. 11.

Wherein the figures include the following reference numerals:

1. the femoral medullary cavity; 2. an intramedullary fusion device; 3. a layer of bone cement; 4. a distal end of the femoral medullary cavity; 5. a stenosis in the femoral medullary cavity; 10. a first arc-shaped plate; 11. a notch; 20. a second arc-shaped plate; 21. positioning the opening; 30. an adjustment structure; 31. a first adjustment tooth; 32. a second adjustment tooth; 40. a pivot structure; 41. a shaft sleeve; 42. a pivot; 50. a femoral prosthesis.

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 invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope 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 example 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 those 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.

As shown in fig. 1 to 6, the intramedullary cage of the present embodiment includes: a first arcuate plate 10, a second arcuate plate 20 and an adjustment structure 30. A first end of the second arcuate plate 20 is pivotally connected to a first end of the first arcuate plate 10. The adjusting structure 30 is arranged between the second ends of the first arc-shaped plate 10 and the second arc-shaped plate 20, so that a positioning opening 21 with adjustable radial dimension is formed between the first arc-shaped plate 10 and the second arc-shaped plate 20.

With the technical solution of the present embodiment, the second end of the first arc-shaped plate 10 can adjust the position of the second end of the first arc-shaped plate 10 on the second end of the second arc-shaped plate 20 through the adjusting structure 30, so that the radial dimension of the positioning opening 21 becomes relatively small. At this time, the intramedullary cage passes through the narrow portion 5 of the femoral medullary cavity, and after the intramedullary cage is implanted, the position of the second end of the first curved plate 10 on the second end of the second curved plate 20 is adjusted so that the radial dimension of the positioning port 21 becomes relatively large. At this moment, the intramedullary fusion cage can fill a part of space of the far end 4 of the femoral medullary cavity, meanwhile, the first arc-shaped plate 10 and the second arc-shaped plate 20 are attached to the cavity wall of the femoral medullary cavity 1, the first arc-shaped plate 10 and the second arc-shaped plate 20 are both mutually extruded with the cavity wall of the femoral medullary cavity 1 and tightly press-fit to generate enough friction damping, and the first arc-shaped plate 10 and the second arc-shaped plate 20 can generate a supporting effect on bone of the femoral medullary cavity 1. When the radial size of the positioning opening 21 is relatively increased, the end of the femoral prosthesis is clamped in the positioning opening 21 under the condition that the end of the femoral prosthesis penetrates out of the positioning opening 21, so that the swing range of the end of the femoral prosthesis 50 is limited, the femoral prosthesis is prevented from swinging in the femoral medullary cavity 1, the end of the femoral prosthesis 50 can be fixed to a proper position, and the femoral prosthesis is effectively fixed in the femoral medullary cavity 1. Therefore, a large amount of bone cement in the related technology is not needed, and secondary damage to a patient is avoided. Therefore, the technical scheme of the embodiment effectively solves the problem of secondary injury to a patient when a large amount of bone cement is used for fixing the end part of the femoral prosthesis in the related art.

In this embodiment, the first arcuate plate 10 and the second arcuate plate 20 may be spread apart by a tool. The tool may be a cone-like structure or a distracting device.

In the related art, a positioning sleeve is provided, which is made of a nickel titanium alloy, which is a memory alloy having a memory property and is capable of returning to an original state under a specific condition after being deformed. The locating sleeve can be contracted together in a low-temperature environment, and when the locating sleeve enters the femoral medullary cavity and the temperature gradually rises, the diameter of the locating sleeve is gradually increased when the temperature in the femoral medullary cavity reaches a certain temperature, so that the locating sleeve is located and supported in the femoral medullary cavity. However, when the temperature condition does not meet the requirement or the diameter of the positioning sleeve cannot be gradually increased due to other reasons (the magnetic attraction is realized through the magnetic attraction matching, the positioning sleeve cannot be positioned and supported in the femoral bone marrow cavity).

The embodiment can effectively solve the problems of the positioning sleeve made of the nickel-titanium alloy. As shown in fig. 4 to 6, in the present embodiment, the adjusting structure 30 includes a first adjusting tooth 31 and a second adjusting tooth 32 engaged with the first adjusting tooth 31. The first adjusting tooth 31 is arranged at the outer side of the second end of the first arc-shaped plate 10, the second adjusting tooth 32 is arranged at the inner side of the second end of the second arc-shaped plate 20, the second adjusting tooth 32 comprises a plurality of first tooth parts, wherein when the first adjusting tooth 31 is matched with different first tooth parts, the second end of the first arc-shaped plate 10 is at different adjusting positions relative to the second end of the second arc-shaped plate 20. Thus, the diameter of the positioning opening 21 can be changed from small to large, and the diameter of the intramedullary fusion device can be changed and adjusted. That is, the intramedullary fusion device fills a part of the space of the femoral medullary cavity 1, so that the diameter of the femoral medullary cavity is variable, and the diameter of the femoral medullary cavity is reconstructed. The possibility that the positioning sleeve made of the nickel-titanium alloy cannot realize positioning and supporting when the temperature condition does not meet the requirement is avoided. Therefore, the intramedullary fusion device adopts mechanical cooperation to realize diameter variation, so that the positioning and supporting effect of the intramedullary fusion device is more reliable.

As shown in fig. 4 to 6, when the second ends of the first arc-shaped plate 10 and the second arc-shaped plate 20 are matched together through the adjusting structure 30, the first arc-shaped plate 10 and the second arc-shaped plate 20 can generate outward tension. The second end of the first arc 10 is rotated clockwise, and the first adjustment tooth 31 is engaged with a different first tooth portion, so that the radial dimension of the positioning opening 21 is relatively reduced. The second end of the first arc-shaped plate 10 rotates counterclockwise, and when the first adjusting tooth 31 is matched with different first tooth parts, the radial size of the positioning opening 21 is relatively increased. In contrast, the second end of the second arc-shaped plate 20 rotates counterclockwise, and when the first adjusting tooth 31 is matched with the different first tooth part, the radial size of the positioning opening 21 is relatively reduced. The second end of the second arc-shaped plate 20 rotates clockwise, and when the first adjusting tooth 31 is matched with different first tooth parts, the radial size of the positioning opening 21 is relatively enlarged.

In this embodiment, as shown in fig. 4 to 6, the second end of the first arc-shaped plate 10 is at different adjusting positions relative to the second end of the second arc-shaped plate 20, so that the radial dimension of the positioning opening 21 can be adjusted from small to large or from large to small. Thus, on the one hand, the relative positions of the first curved plate 10 and the second curved plate 20 can be adjusted according to the shapes of different femoral medullary cavities so as to meet the use requirements. On the other hand, the shape of the femoral prosthesis 50 can be further adjusted to meet the use requirement. The projection of the intramedullary cage of the present embodiment on the vertical plane may be rectangular or trapezoidal, so that it can satisfy the shapes of different femoral medullary cavities.

As shown in fig. 1, 4 to 6, the first adjustment tooth 31 includes a plurality of second tooth portions. Like this, a plurality of second tooth portion and a plurality of first tooth portion cooperations of difference can improve the cooperation intensity of first regulation tooth 31 and second regulation tooth 32 for the root of first regulation tooth 31 or second regulation tooth 32 is difficult for taking place, improves the reliability of the cooperation of first regulation tooth 31 and second regulation tooth 32.

As shown in fig. 1, 4 to 6, the first tooth portion is a trapezoidal tooth, and the angle of the first tooth portion is 30 degrees. The second tooth part is a triangular tooth, and the angle of the second tooth part is 60 degrees. Thus, when the radial dimension of the positioning opening 21 can be increased from small to large, the second end of the first arc-shaped plate 10 can be smoothly matched with the second end of the second arc-shaped plate 20 in a sliding manner, so that the first tooth part can be conveniently occluded, and meanwhile, the first tooth part can be prevented from retreating relative to the second tooth part. When the radial dimension of the positioning opening 21 can be reduced from large to small, the second end of the first arc-shaped plate 10 can be smoothly matched with the second end of the second arc-shaped plate 20 in a sliding manner, so that the first tooth part can be conveniently occluded, and meanwhile, the first tooth part can be prevented from retreating relative to the second tooth part.

As shown in fig. 1, 3, 7 and 8, the first arc plate 10 is provided with notches 11 at positions corresponding to the first teeth. The setting of breach 11 can be adjusted first regulation tooth 31 and the second bite-force of adjusting between the tooth 32, only needs to warp in a plurality of first tooth portion departments, and the other parts that lie in breach 11 of first arc 10 do not warp, is favorable to balancing the holistic elastic modulus of first arc 10, makes a plurality of second tooth portions and a plurality of first tooth portion cooperations of difference can be reliably and stably cooperate together.

As shown in fig. 1, 4-6, the first arcuate plate 10 is connected to the second arcuate plate 20 by a pivot structure 40. The axis of the pivot structure 40 is parallel to the locating port 21 axis. In this way, the first arcuate plate 10 can rotate smoothly with respect to the second arcuate plate 20. The pivot structure 40 includes a sleeve 41 and a pivot 42 passing through the sleeve 41, the sleeve 41 is disposed on the first arc-shaped plate 10, and the pivot 42 is disposed on the second arc-shaped plate 20. Thus, the matching structure of the shaft sleeve 41 and the pivot 42 is simple, the processing is easy, and the realization is easy. In this embodiment, the two bushings 41 are spaced apart along the axial direction of the positioning opening 21, the two bushings 41 are aligned in the vertical direction, the first end of the pivot 42 is inserted into the upper bushing, and the second end of the pivot 42 is inserted into the lower bushing.

As shown in fig. 1, 4-6, the sleeve 41 and the pivot 42 are in clearance fit. In this way, a sufficient play is left between the sleeve 41 and the pivot 42 to allow the first arc 10 to rotate more smoothly with respect to the second arc 20. Preferably, the amount of clearance between the sleeve 41 and the pivot 42 is between 0.1mm and 0.5mm, preferably 0.1mm or 0.3mm or 0.5 mm.

As shown in fig. 7 and 8, the first arc plate 10 includes a first arc body and a first anti-slip structure provided on an outer side of the first arc body. First anti-skidding structure can make the outer wall of first arc 10 have higher coefficient of friction, can prevent to laminate the first arc 10 on the chamber wall in femoral medullary cavity 1 and sink, is favorable to improving the support effect to the sclerotin production in femoral medullary cavity 1. Meanwhile, the bonding force between the first arc-shaped plate 10 and the cavity wall of the femoral medullary cavity 1 can be increased, and tighter press fit is realized.

As shown in fig. 7 and 8, the first arc-shaped body has a porous structure, which facilitates the integration of the first arc-shaped plate 10 with the bone of the femoral medullary cavity, and facilitates the growth of bone cells, so that the femoral prosthesis 50 can be stably fixed in the femoral medullary cavity 1 for a long time.

In an embodiment not shown in the figures, the first anti-slip arrangement comprises a first arc-shaped slot or a third tooth. The length of the third tooth extends in the axial direction of the positioning hole 21. The first arc-shaped groove or the third tooth part can be inserted into the bone of the femoral medullary cavity 1, so that the first arc-shaped plate 10 cannot sink along the cavity wall of the femoral medullary cavity 1 on one hand, and the strength of the bone of the femoral medullary cavity 1 can be enhanced on the other hand.

As shown in fig. 9 and 10, the second arc plate 20 includes a second arc body and a second anti-slip structure provided on an inner side of the second arc body. The second anti-slip structure can make the outer wall of the second arc-shaped plate 20 have higher friction coefficient, can prevent the second arc-shaped plate 20 attached to the cavity wall of the femoral medullary cavity 1 from sinking, and is favorable for improving the supporting effect on the bone of the femoral medullary cavity 1. Meanwhile, the binding force between the second arc-shaped plate 20 and the cavity wall of the femoral medullary cavity 1 can be increased, and tighter press fit can be realized.

As shown in fig. 9 and 10, the second curved body has a porous structure. In this way, it is advantageous to integrate the second arc-shaped plate 20 with the bone of the femoral medullary cavity, facilitating the ingrowth of bone cells, so that the femoral prosthesis 50 can be stably fixed in the femoral medullary cavity 1 for a long period of time.

In an embodiment not shown in the figures, the second anti-slip arrangement comprises a second arc-shaped slot or a fourth tooth. The length of the fourth tooth extends in the axial direction of the positioning hole 21. The second arc-shaped groove or the fourth tooth part can be inserted into the bone of the femoral medullary cavity 1, so that on one hand, the second arc-shaped plate 20 cannot sink along the cavity wall of the femoral medullary cavity 1, and on the other hand, the strength of the bone of the femoral medullary cavity 1 can be enhanced.

In the present embodiment, the porous structure forms a plurality of pores, similar to the trabecular bone structure in the related art. Trabecular bone in the related art is an extension of cortical bone within cancellous bone, i.e., trabecular bone is connected to cortical bone. It has irregular three-dimensional net structure in the cavity of bone sponge, such as loofah sponge-like or spongy, and has the function of supporting hematopoietic tissues.

The intramedullary fusion device of the embodiment is realized by 3D printing, and is convenient and easy to form.

In the present embodiment, as shown in fig. 2 and 8, the relationship between the dimension D and the dimension J: J-2/3D.

The present application also provides a femoral prosthesis component, as shown in fig. 11 and 12, which includes a femoral prosthesis 50 and an intramedullary cage 2. The end of the femoral prosthesis 50 is inserted into the intramedullary fusion device 2, which is the above-described intramedullary fusion device. Since the above-described intramedullary cage can solve the problem of secondary injury to a patient when the end of the femoral component is fixed using a large amount of bone cement in the related art, the femoral component assembly having the intramedullary cage can achieve the same effect. The femoral prosthesis 50 of the present embodiment is preferably a titanium alloy femoral stem.

As shown in fig. 1, 11 and 12, a filling space is defined between the cavity wall of the femoral medullary cavity 1, the femoral prosthesis 50 and the intramedullary cage 2, and the femoral prosthesis assembly further comprises a cement layer 3 disposed in the filling space.

In this embodiment, the procedure for using the femoral prosthetic component is as follows:

1) the intramedullary cage 2 is placed into the distal end 4 of the femoral medullary cavity to a predetermined depth using a tool of a conical structure.

2) The intramedullary fusion device 2 is attached to any position of the cavity wall of the femoral medullary cavity 1, the intramedullary fusion device 2 is stabilized by means of the friction force between the intramedullary fusion device 2 and the cavity wall of the femoral medullary cavity 1, the tool with the conical structure is moved downwards, the positioning opening 21 is gradually enlarged, and the first arc-shaped plate 10 and the second arc-shaped plate 20 are gradually expanded.

3) And continuously moving the tool with the conical structure until the second ends of the first arc-shaped plate 10 and the second arc-shaped plate 20 are opened to proper positions, so that the first arc-shaped plate 10 and the second arc-shaped plate 20 are tightly attached to the cavity wall of the femoral medullary cavity 1 to play a supporting role.

4) The bone cement layer 3 prepared to have a certain viscosity is filled in the intramedullary fusion cage 2.

5) The femoral prosthesis 50 is inserted, the femoral prosthesis 50 extrudes the cement layer 3, the end of the femoral prosthesis 50 is fixed in the intramedullary fusion device 2, and the intramedullary fusion device 2 plays a role in supporting and positioning.

The filling space is gradually enlarged from the narrow portion 5 of the femoral canal to the distal end 4 of the femoral canal, and before the femoral prosthesis 50 is inserted into the intramedullary fusion device 2, the bone cement layer 3 is filled into the filling space in the direction from the narrow portion 5 of the femoral canal to the distal end 4 of the femoral canal, and a part of the bone cement layer 3 can be fixed inside the intramedullary fusion device 2. Like this, bone cement layer 3 only need fill into in the space between intramedullary cage 2 and the femoral prosthesis 50, alright in order to accomplish the fixed of femoral prosthesis 50, and intramedullary cage 2 prevents that bone cement layer 3 from continuing to pack downwards on the one hand, and on the other hand has greatly reduced the use of fillers such as bone cement, further reduces to initiate bone cement disease or to the injury of human body. Meanwhile, the bone cement layer 3 is filled in the gaps among the first arc-shaped plate 10, the second arc-shaped plate 20, the adjusting structure 30, the femoral prosthesis 50 and the cavity wall of the femoral medullary cavity 1, so that the friction among the first arc-shaped plate 10, the second arc-shaped plate 20 and the femoral prosthesis 50 can be reduced, and the first arc-shaped plate 10, the second arc-shaped plate 20 and the femoral prosthesis 50 are prevented from being worn. The friction between the first arc-shaped plate 10 and the second arc-shaped plate 20 and the cavity wall of the femoral medullary cavity 1 can be reduced, and the abrasion between the first arc-shaped plate 10 and the cavity wall of the femoral medullary cavity 1 and the abrasion between the second arc-shaped plate 20 and the cavity wall of the femoral medullary cavity 1 are avoided.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific 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

1. An intramedullary fusion device, comprising:

a first arcuate plate (10);

a second arcuate plate (20), a first end of the second arcuate plate (20) being pivotably connected to a first end of the first arcuate plate (10);

the adjusting structure (30) is arranged between the second end of the first arc-shaped plate (10) and the second end of the second arc-shaped plate (20) so that a positioning opening (21) with adjustable radial dimension is formed between the first arc-shaped plate (10) and the second arc-shaped plate (20).

2. Intramedullary fusion device according to claim 1, characterized in that the adjustment structure (30) comprises a first adjustment tooth (31) and a second adjustment tooth (32) cooperating with the first adjustment tooth (31), the first adjustment tooth (31) being arranged outside the second end of the first curved plate (10), the second adjustment tooth (32) being arranged inside the second end of the second curved plate (20), the second adjustment tooth (32) comprising a plurality of first teeth, wherein the second end of the first curved plate (10) is in a different adjustment position with respect to the second end of the second curved plate (20) when the first adjustment tooth (31) cooperates with a different first tooth.

3. Intramedullary fusion device according to claim 2, characterized in that the first adjustment tooth (31) comprises a plurality of second teeth.

4. Intramedullary fusion device according to claim 2, characterized in that the first curved plate (10) is provided with notches (11) in positions corresponding to the first teeth.

5. Intramedullary fusion device according to claim 1, characterized in that the first curved plate (10) is connected to the second curved plate (20) by means of a pivoting structure (40), the axis of the pivoting structure (40) being parallel to the axis of the positioning opening (21), the pivoting structure (40) comprising a bushing (41) and a pivot (42) passing inside the bushing (41), the bushing (41) being arranged on the first curved plate (10) and the pivot (42) being arranged on the second curved plate (20).

6. Intramedullary fusion device according to claim 5, characterized in that the sleeve (41) and the pivot (42) are a clearance fit.

7. Intramedullary fusion device according to claim 1, characterized in that the first curved plate (10) comprises a first curved body and a first anti-slip structure arranged on the outer side of the first curved body; the first arc-shaped body is of a porous structure; the first anti-slip structure comprises a first arc-shaped groove or a third tooth part, wherein the length of the third tooth part extends along the axial direction of the positioning opening (21).

8. Intramedullary cage according to claim 1, characterized in that the second curved plate (20) comprises a second curved body and a second anti-slip structure arranged on the inner side of the second curved body; the second arc-shaped body is of a porous structure; the second anti-slip structure comprises a second arc-shaped groove or a fourth tooth part, wherein the length of the fourth tooth part extends along the axial direction of the positioning opening (21).

9. A femoral prosthesis component comprising a femoral prosthesis (50) and an intramedullary cage (2), wherein the end of the femoral prosthesis is threaded into the intramedullary cage and the intramedullary cage is as claimed in any one of claims 1 to 8.

10. The femoral prosthesis component according to claim 9, characterized in that a filling space is enclosed between the cavity wall of the femoral medullary cavity (1), the femoral prosthesis (50) and the intramedullary cage (2), the femoral prosthesis component further comprising a layer of bone cement (3) arranged in the filling space.