CN204636619U - Tibial plateau assembly - Google Patents

Abstract

The utility model provides a tibial platform assembly, which comprises a platform main body (10) and a support part (20) arranged below the platform main body (10). The tibial platform assembly also includes a fixing plate (31) and a The fasteners of the block, the fixed plate (31) is connected on the circumferential side wall of the platform main body (10), and the fixed plate (31) extends along the axial direction of the platform main body (10), and the fastener is worn on the fixed On the plate (31) and the supporting part (20), a space for accommodating and fixing the implanted bone block is formed between the fixing plate (31) and the supporting part (20). The technical solution of the utility model can effectively solve the problem that the tibial plateau assembly in the prior art cannot realize the repair of non-contained bone defects alone.

Description

tibial plateau assembly

technical field

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

Background technique

The knee joint is one of the important joints of the lower limbs of the human body. At the same time, knee joint disease is also a common and frequently-occurring disease in the elderly. One of its specific manifestations is that the wear and tear of articular cartilage or degeneration can lead to joint pain.

In the process of treating knee arthrosis, the most commonly used is resurfacing in knee arthroplasty. Specifically, a thin layer of worn cartilage and subchondral bone on the femur and tibia of the knee joint is cut off to form an osteotomy surface, and then the cobalt-chromium-molybdenum alloy metal implant prosthesis is fixed by direct fixation or bone cement It is fixed to the osteotomy surface in a manner that replaces the worn bone of the joint. In the above-mentioned implant prosthesis, the part used to replace the bone on the femoral side is called the femoral condyle, and the part used to replace the bone on the tibial side is called the tibial plateau, and a polyethylene pad is lined between the femoral condyle and the tibial plateau, so that Play a role in reducing friction and restoring knee joint function.

Currently, total knee arthroplasty is usually required for bone defects in the knee joint. In the above-mentioned artificial total knee replacement process, especially in the revision operation, there is sometimes a certain degree of bone loss. Knee bone defects are broadly divided into inclusive and noninclusive bone defects. Among them, the inclusive bone defect is still surrounded by complete cortical bone, which can be filled with granular bone graft or bone cement screw during revision. However, partial or total loss of cortical bone surrounding non-contained bone defects necessitates clinical reconstruction with revision prostheses, which will result in a larger area of bone removal and adversely affect future revisions. . Therefore, how to deal with the non-contained bone defect during primary arthroplasty is one of the challenges in primary total knee arthroplasty.

Utility model content

The main purpose of the present invention is to provide a tibial plateau assembly to solve the problem that the tibial plateau assembly in the prior art cannot repair non-inclusive bone defects alone.

In order to achieve the above object, the utility model provides a tibial platform assembly, which includes a platform main body and a support part arranged below the platform main body. The tibial platform assembly also includes a fixing plate and fasteners for fixing the implanted bone block. The plate is connected to the circumferential side wall of the platform main body, and the fixed plate extends along the axial direction of the platform main body, and the fasteners are passed through the fixed plate and the support part, and the fixed plate and the support part are formed between the fixed plate and the support part for accommodating and fixing Space for implanted bone fragments.

Further, the fixing plate is arranged in an adjustable position along the circumferential direction of the platform main body.

Further, the fastener is a first fastening screw, and the supporting part has a threaded hole matched with the first fastening screw.

Further, the fixing plate has a through hole for passing through the first fastening screw.

Further, the fixing plate is connected to the side wall of the platform main body by a second fastening screw.

Further, the inner surface of the fixing plate facing the platform main body has a limiting step, and the step surface of the limiting step matches the lower surface of the platform main body.

Further, the support part includes a support column and a support rod arranged below the support column, and the threaded hole is located on the circumferential side wall of the support column.

Further, the support column has an accommodation cavity, and a fusion through hole communicating with the accommodation cavity is formed on the circumferential side wall of the support column.

Further, the support column is tapered, and the support column extends gradually in a direction away from the main body of the platform.

Further, both the outer surface of the support part and the inner surface of the fixing plate facing the support part have biological coatings.

Applying the technical scheme of the utility model, a fixing plate is fixedly arranged on the platform main body, and fasteners are provided on the fixing plate and the supporting part. When repairing a non-contained bone defect, a bone block is implanted in the space between the fixation plate and the support part, and the bone block is fixed by a fastener. Then, the tibial plateau component is placed on the patient's proximal tibia, so as to realize the repair of the non-contained bone defect, avoid the use of revision prosthesis reconstruction, and play a positive role in the preservation of the patient's bone quality.

Description of drawings

The accompanying drawings constituting a part of this application are used to provide a further understanding of the utility model, and the schematic embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute improper limitations to the utility model. In the attached picture:

Fig. 1 shows a schematic structural view of an embodiment of a tibial plateau assembly according to the present invention;

Fig. 2 shows a structural schematic diagram of another angle of the tibial plateau assembly of Fig. 1;

Fig. 3 shows a schematic structural view of the platform main body and the supporting part of the tibial platform assembly of Fig. 1;

Fig. 4 shows a structural schematic diagram of another angle of the platform main body and the support part in Fig. 3;

Fig. 5 shows a schematic view of the structure of the fixed plate of the tibial platform assembly of Fig. 1 facing the main body of the platform;

Fig. 6 shows a schematic view of the structure of the side of the fixing plate in Fig. 5 facing away from the main body of the platform; and

FIG. 7 shows a structural schematic diagram of another angle of the fixing plate in FIG. 5 .

Wherein, the above-mentioned accompanying drawings include the following reference signs:

10. Platform main body; 20. Support portion; 21. Threaded hole; 22. Support column; 23. Support rod; 24. Fusion through hole; 31. Fixed plate; 311. Through hole; 312. Limiting steps; A fastening screw; 33. The second fastening screw.

Detailed ways

It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The utility model will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

As shown in FIGS. 1 and 2 , the tibial platform assembly in this embodiment includes a platform main body 10 and a support portion 20 disposed below the platform main body 10 . The tibial plateau assembly also includes a fixation plate 31 and fasteners for fixing the implanted bone fragments. Wherein, the fixing plate 31 is connected to the circumferential side wall of the platform main body 10 , and the fixing plate 31 extends along the axial direction of the platform main body 10 . The fastener is passed through the fixing plate 31 and the supporting portion 20 . A space for accommodating and fixing the implanted bone fragment is formed between the fixing plate 31 and the supporting part 20 .

Applying the tibial platform assembly of this embodiment, the fixing plate 31 is fixedly arranged on the platform main body 10 , and fasteners are provided on the fixing plate 31 and the supporting part 20 . When repairing a non-contained bone defect, a bone block is implanted in the space between the fixing plate 31 and the supporting part 20, and the bone block is fixed by a fastener. Then, the tibial plateau component is placed on the patient's proximal tibia, so as to realize the repair of the non-contained bone defect, avoid the use of revision prosthesis reconstruction, and play a positive role in the preservation of the patient's bone quality.

It should be noted that, in this embodiment, the implanted bone block is fixed between the fixing plate 31 and the supporting part 20 by the first fastening screw 32 . The above-mentioned bone blocks are pierced on the first fastening screw 32 (not shown in the figure). When the bone defect is repaired, first place the bone block between the fixing plate 31 and the support part 20, then pass the first fastening screw 32 through the through hole 311 on the fixing plate 31 and the bone block, and then screw it on the support In the threaded hole 21 of the part 20, the bone block can be firmly fixed. Of course, the matching position of the bone block and the first fastening screw 32 is not limited thereto. In other embodiments, multiple first fastening screws 32 may be used to clamp the bone block to achieve fixation of the bone block.

In this embodiment, the fixing plate 31 is adjustable along the circumferential position of the platform main body 10 . According to the specific defect site of the patient, the position of the fixation plate 31 relative to the support part 20 can be adjusted, so that the implanted bone block between the fixation plate 31 and the support part 20 is more suitable for the defect site and the repair effect is better .

As shown in FIGS. 1 to 7 , in the tibial plateau assembly of this embodiment, the fastener is a first fastening screw 32 , and the support portion 20 has a threaded hole 21 that matches the first fastening screw 32 . The structure of the first fastening screw 32 is simple and easy to implement, and the first fastening screw 32 can generate tension on the fixing plate 31 and the support part 20, so as to effectively prevent the rotation of the tibial plateau assembly in the patient's body, thereby enhancing implantation. Stability of the prosthesis in the patient's body. In this embodiment, the number of the first fastening screws 32 is four. It should be noted that the number of the first fastening screws 32 can be adjusted according to the specific requirements on the position and quantity of the implanted bone fastening and fixing plate 31. Adjustment. Certainly, the form of the fastener is not limited thereto, and in an embodiment not shown in the figure, the fastener may be other types of fastening structures, such as a fixing screw, a fixing pin, and the like.

As shown in FIG. 1 , FIG. 2 and FIG. 5 to FIG. 7 , in the tibial plateau assembly of this embodiment, the fixing plate 31 has a through hole 311 for passing the first fastening screw 32 . The through holes 311 on the fixing plate 31 correspond to the threaded holes 21 on the supporting portion 20 one by one. Setting the fixing plate 31 and the first fastening screw 32 as a separate structure makes it more flexible to use. Certainly, the structure of the fixing plate 31 and the first fastening screw 32 is not limited thereto, and in an embodiment not shown in the figure, the fixing plate 31 and the first fastening screw 32 may also be integrally structured.

In this embodiment, the material of the fixing plate 31 is pure titanium, so that the fixing plate 31 can be properly bent during the operation to fit the patient's bone as much as possible. Certainly, the material of the fixing plate 31 is not limited thereto, and in other embodiments, the fixing plate 31 may be made of other materials.

As shown in FIG. 1 and FIG. 2 , in the tibial platform assembly of this embodiment, the fixing plate 31 is fixedly connected to the side wall of the platform main body 10 through a second fastening screw 33 . The side wall of the platform main body 10 has a plurality of screw holes corresponding to the second fastening screws 33 , and the fixing plate 31 is fixed on the side wall of the platform main body 10 by the second fastening screws 33 . In addition, the specific position of the fixing plate 31 can be adjusted by matching the second fastening screws 33 with different screw holes on the platform main body 10 .

As shown in Fig. 1, Fig. 2, Fig. 5 and Fig. 7, in the tibial platform assembly of this embodiment, the inner surface of the fixing plate 31 facing the platform main body 10 has a limiting step 312, and the step surface of the limiting step 312 is in line with the The lower surface of the platform body 10 fits. The above structure plays a role in positioning the platform main body 10 . In this embodiment, the fixed plate 31 is divided into an upper fixed edge and a lower fixed plate wing with the limit step 312 as the boundary, the upper fixed edge is fixedly connected with the side wall of the platform main body 10 through the second fastening screw 33, and the lower fixed plate The wing has a through hole 311 for passing the first fastening screw 32 . When the bone defect is repaired, the step surface of the limiting step 312 of the fixing plate 31 is attached to the lower surface of the platform main body 10, and the second fastening screw 33 is used to fix the fixing plate 31 on the side wall of the platform main body 10 superior.

As shown in FIGS. 1 to 4 , in the tibial plateau assembly of this embodiment, the support portion 20 includes a support column 22 and a support rod 23 disposed below the support column 22 , and the threaded hole 21 is located on the circumferential side wall of the support column 22 superior. The supporting part 20 is inserted into the tibial medullary cavity of the human body to serve as an auxiliary support for the tibial plateau assembly. In this embodiment, the support column 22 has an accommodation cavity inside, and a fusion through hole 24 communicating with the accommodation cavity is provided on the circumferential side wall of the support column 22 . Fusion bone fragments can be selectively implanted in the receiving cavity, and the fusion bone fragments can pass through the fusion through hole 24 and the intact bone tissue around the support part 20 or the bone fragments implanted between the fixation plate 31 and the support part 20 are very close. Good fusion together can realize the maximum adaptation to the shape of the bone defect and improve the repair quality of the bone defect.

As shown in FIGS. 1 to 4 , in the tibial plate assembly of the present embodiment, the support column 22 is tapered, and the support column 22 gradually shrinks and extends away from the platform main body 10 . The above structure can make the implantation of the support part 20 easier to operate. Of course, the shape of the support column 22 is not limited thereto, and in an embodiment not shown in the figure, the support column 22 may also have other shapes.

In the prior art, most knee joint implants are fixed with human bones in a bone cement fixation manner. However, the bone cement itself has some defects, which will cause some complications, such as bone cement debris can cause prosthesis loosening. In actual treatment, biological fixation is also used for younger patients with better bone quality, but biological fixation is not suitable for older patients with poor bone quality.

In this embodiment, the lower part of the platform body 10 has a bone cement groove. The upper surface of the platform main body 10 is matched with the tibial spacer, and the bone cement groove at the lower part is used to accommodate the bone cement, and the osteotomy surface at the joint between the platform main body 10 and the tibial joint is fixed by the bone cement.

As shown in FIGS. 1 to 7 , in the tibial plateau assembly of this embodiment, both the outer surface of the support part 20 and the inner surface of the fixing plate 31 facing the support part 20 have biological coatings. The biological coating can be a hydroxyapatite biological ceramic coating or a pure titanium powder coating. In this embodiment, the supporting part 20 is inserted into the medullary cavity of the tibial bone of the human body, and the arrangement of the biological coating can better fuse the supporting part 20 with the bone marrow in the medullary cavity to realize biological fixation. In addition, the biological coating on the inner surface of the fixation plate 31 facing the platform body 10 can also be well integrated with the implanted bone fragment. It should be noted that the biological coating is not limited to the hydroxyapatite bioceramic coating and the pure titanium powder coating, and in other embodiments not shown in the figure, the biological coating can also be other forms of biological coating.

The above-mentioned structure can realize the compound fixation method of bone cement fixation and biological fixation, and by combining the advantages of the two fixation methods, it has a good therapeutic effect on patients of different ages and different bone qualities.

From the above description, it can be seen that the above-mentioned embodiments of the present invention have achieved the following technical effects: the tibial plateau assembly of the present application can realize the repair of non-contained bone defects, avoid the use of revision prosthesis reconstruction, and improve the patient's Bone preservation plays a positive role. In addition, the tibial plateau component of the present application adopts bone cement fixation technology, bio-coating technology and bone fusion technology at the same time, which can have a good effect on the stability and fixation of the implanted prosthesis at the initial and later stages.

The above descriptions are only preferred embodiments of the utility model, and are not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (10)

1. a tibial plateau assembly, comprise main platform body (10) and be arranged on the support portion (20) below described main platform body (10), it is characterized in that, described tibial plateau assembly also comprises fixing head (31) and the securing member for fixing implantable bone block, described fixing head (31) is connected in the circumferential side wall of described main platform body (10), and described fixing head (31) extends along the axial direction of described main platform body (10), described securing member is located in described fixing head (31) with on described support portion (20), the space for holding and fix described implantable bone block is formed between described fixing head (31) and described support portion (20).

2. tibial plateau assembly according to claim 1, is characterized in that, described fixing head (31) is arranged adjustably along the circumferential position of described main platform body (10).

3. tibial plateau assembly according to claim 1, it is characterized in that, described securing member is the first trip bolt (32), and described support portion (20) have the screwed hole (21) matched with described first trip bolt (32).

4. tibial plateau assembly according to claim 3, is characterized in that, described fixing head (31) has the through hole (311) for wearing described first trip bolt (32).

5. tibial plateau assembly according to claim 1, is characterized in that, is connected between described fixing head (31) and the sidewall of described main platform body (10) by the second trip bolt (33).

6. tibial plateau assembly according to claim 1, it is characterized in that, described fixing head (31) has limited step (312) on the inner surface of described main platform body (10), and the step surface of described limited step (312) matches with the lower surface of described main platform body (10).

7. tibial plateau assembly according to claim 3, it is characterized in that, described support portion (20) comprises support column (22) and is arranged on the support bar (23) of described support column (22) below, and described screwed hole (21) is positioned in the circumferential side wall of described support column (22).

8. tibial plateau assembly according to claim 7, is characterized in that, described support column (22) has container cavity, the circumferential side wall of described support column (22) has the fusion through hole (24) communicated with described container cavity.

9. tibial plateau assembly according to claim 8, is characterized in that, described support column (22) is tapered, and described support column (22) extends along away from the direction of described main platform body (10) being shunk gradually ground.

10. tibial plateau assembly according to claim 1, is characterized in that, the outer surface of described support portion (20) and described fixing head (31) on the inner surface of described support portion (20), all there is biological coating.