Fixing structure for repairing acetabulum

Abstract

The utility model relates to the technical field of medical instruments, in particular to a fixing structure for repairing acetabulum, which comprises a fixing plate and a cushion block, and the fixing plate is fixed on the rear upper part of the acetabulum; the cushion block is mounted at the acetabular fossa; the fixed plate and the cushion block are fixed through a bolt; a positioning plate is arranged on one side of the cushion block installation opening. During use, the fixing plate is arranged on the upper rear portion of the acetabulum, a stable structure on the upper rear portion of the acetabulum is rebuilt through the fixing plate, then the cushion block is installed at the position of the acetabular fossa, and therefore the bone defect range of the acetabulum is reduced to the size of a common acetabular cup; the mounting angle of the acetabular cup is adjusted through the positioning plate, the whole operation is simple, the operation time is shortened, and the position of the artificial prosthesis is accurately mounted; the fixing plate, the cushion block and the positioning plate are matched to solve the problems of repairing of huge acetabulum defects and installation of prosthesis positions, the prosthesis does not need to be specially printed before an operation, a large amount of pressing bone grafting is not needed, and the operation cost of a patient is saved.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and more specifically, to a fixation structure for repairing the acetabulum. Background Technology

[0002] Total hip arthroplasty (THA) is a common surgical procedure for treating severe hip joint diseases. With the development of medical technology and the improvement of prosthetic materials, the 10-15 year survival rate of THA prostheses can reach 90%. Although the survival rate of THA is very high, some patients still need hip revision surgery due to aseptic loosening, dislocation, infection, and other reasons.

[0003] Acetabular bone defects are among the most challenging problems in hip revision surgery. Reconstructing the bone defect based on the remaining acetabular bone, restoring the hip joint's center of rotation, achieving initial stability and fixation of the revision prosthesis, and ensuring sufficient active bone contact area are crucial for successful revision. However, current surgical methods often employ porous biological acetabular cups, pressure grafts, structural bone grafts, and biological metal reinforcement blocks. These methods have drawbacks such as limited bone source, bone graft resorption, fixation failure, mismatch between the block shape and the defect, and difficulty in achieving long-term biological stability. Therefore, clinical outcomes vary and there is considerable controversy surrounding these methods.

[0004] In view of this, we propose a fixation structure for repairing the acetabulum. Utility Model Content

[0005] The purpose of this invention is to provide a fixation structure for repairing the acetabulum.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A fixation structure for repairing the acetabulum includes a fixation plate and a pad. The fixation plate is fixed to the upper posterior part of the acetabulum to provide load-bearing capacity after reconstruction of the damaged acetabulum. The pad is installed in the acetabular fossa to provide an installation environment for the acetabular cup. The fixation plate and the pad are fixed together by bolts. A removable positioning plate is provided on one side of the pad's installation opening for adjusting the installation angle of the acetabular cup.

[0008] As a further embodiment of this utility model: the fixing plate is symmetrically provided with a plurality of sliding holes, and one end of the fixing plate is provided with a screw hole.

[0009] As a further embodiment of this utility model, the fixing plate is arched, and the inner side of the fixing plate fits the acetabulum.

[0010] As a further embodiment of this utility model: the pad is an irregular hemispherical shape, the pad is filled with bone cement, and the acetabular cup is fixed in the pad by the bone cement.

[0011] As a further embodiment of this utility model: the surface of the pad is provided with several through holes, and the pad is installed at the inner curve of the arch of the fixing plate.

[0012] As a further embodiment of this utility model, both the fixing plate and the pad are made of titanium alloy.

[0013] As a further embodiment of this utility model: the positioning plate is provided with fixing rods on both sides, one end of the fixing rod is fixed to the ischial spine or anterior superior iliac spine, and the other end is fixed to the positioning plate by a nut.

[0014] As a further embodiment of this utility model: the positioning plate is also provided with several adjustment holes, which are used for grinding the bone around the pad block by the grinding tool and for positioning the subsequent acetabular cup.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] 1. In this fixation structure for repairing the acetabulum, a fixation plate is set on the upper posterolateral side of the acetabulum to reconstruct the stable structure on the upper posterolateral side of the acetabulum. Then, a pad is installed in the acetabular fossa to reduce the bone defect area of ​​the acetabulum to the size of a normal acetabular cup. After the fixation plate and the pad are fixed together with bolts, the installation angle of the acetabular cup is adjusted by the positioning plate. The overall operation is simple, the operation time is shortened, and the artificial prosthesis is installed in a precise position.

[0017] 2. In this fixation structure used to repair the acetabulum, the fixation plate, pad, and positioning plate work together to solve the problems of repairing large acetabular defects and installing the prosthesis. It eliminates the need for preoperative prosthesis printing and extensive bone grafting, saving patients surgical costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the mounting plate installation in this scheme;

[0019] Figure 2 This is a schematic diagram of the installation of the fixing plate and pad in this scheme;

[0020] Figure 3 This is a schematic diagram of the positioning plate installation in this scheme.

[0021] The meanings of the labels in the diagram are as follows:

[0022] 100. Fixing plate; 101. Screw hole; 102. Sliding hole;

[0023] 200, spacer block; 201, through hole;

[0024] 300. Positioning plate; 301. Adjustment hole; 302. Fixing rod. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Example

[0027] like Figure 1 , Figure 2 and Figure 3 As shown, this embodiment provides a fixation structure for repairing the acetabulum, including a fixation plate 100 and a pad 200. Since current techniques cannot repair large defects in the acetabulum, acetabular cup installation is difficult. The reason for this is the inability to rebuild a stable structure around the acetabulum. Therefore, the fixation plate 100 is fixed to the upper posterior part of the acetabulum to provide load-bearing support for the reconstructed upper posterior part of the defective acetabulum; the pad 200 is installed at the acetabular fossa to create an installation environment for the acetabular cup; the fixation plate 100 and the pad 200 are fixed together by bolts. A detachable positioning plate 300 is provided on one side of the mounting opening of the pad 200. The positioning plate 300 is used to adjust the installation angle of the acetabular cup. Through the cooperation of the fixation plate 100, the pad 200, and the positioning plate 300, the problem of large acetabular defects is solved.

[0028] The improvement of this embodiment lies in the following: by setting a fixation plate 100 on the posterosuperior aspect of the acetabulum, the stabilizing structure of the posterosuperior aspect of the acetabulum is reconstructed using the fixation plate 100. Then, by installing a pad 200 in the acetabular fossa, the bone defect of the acetabulum is reduced to the size of a normal acetabular cup. The fixation plate 100 and the pad 200 are fixed together with bolts. The overall operation is simple and the operation time is shortened. At the same time, the fixation plate 100 and the pad 200 together can solve the problem of huge acetabular defects. There is no need to print a special prosthesis before surgery, nor is it necessary to perform a large amount of pressure bone grafting, thus saving surgical costs for patients.

[0029] Since the simplest way to install a fixation plate on the upper posterior side of the acetabulum is by bolting, the fixation plate 100 is symmetrically provided with several sliding holes 102, and one end of the fixation plate 100 is provided with screw holes 101. In this embodiment, the fixation plate 100 is used with 5 sets of sliding holes 102, each hole being 2cm long, and 3 screw holes 101 with a diameter of 4.5mm. One end of the fixation plate 100 is fixed to the acetabulum by bolts passing through the screw holes 101, and the other end can be fixed to the upper posterior side of the acetabulum by adjusting the position of the bolts in the sliding holes 102. Considering the different body shapes of people, the fixation plate 100 is divided into three sizes: large, medium, and small, to suit people of different body shapes.

[0030] To facilitate the subsequent installation of the pad 200, the fixation plate 100 is arched, and its inner side conforms to the acetabulum. The pad 200 has several circular through holes 201 on its surface, and the pad 200 is installed at the inner curve of the arch of the fixation plate 100. The pad 200 also comes in three sizes: large, medium, and small, to suit people of different body types. The diameters of the three different sizes of pad 200 are 40mm, 50mm, and 60mm, respectively. To facilitate the fixation of the acetabular cup, the pad 200 is hemispherical, and bone cement is filled inside the pad 200. The acetabular cup is fixed inside the pad 200 by the bone cement.

[0031] Considering the need to adjust the installation angle of the acetabular cup according to the patient's specific condition during installation, the positioning plate 300 is equipped with fixing rods 302 on both sides. One end of the fixing rod 302 is fixed to the ischial spine or anterior superior iliac spine, and the other end is fixed to the positioning plate 300 by a nut. The positioning plate 300 is also equipped with several adjustment holes 301. After the pad 200 is installed, the reduced acetabular fossa is ground by using an acetabular reamer through the adjustment holes 301. After grinding, the auxiliary rod is inserted into the same adjustment hole 301 as the acetabular reamer, and the acetabular cup is pushed into the ground acetabular fossa. It should be noted that the selection of the adjustment hole 301 needs to take the angle into account. The reference line is the distance from the center of the adjustment hole 301 to the center of the reduced acetabular fossa. This reference line needs to meet the following requirements: the horizontal angle is within 40° to 50° and the vertical angle is within 10° to 15° to prevent hip dislocation.

[0032] It should be further explained that both the fixation plate 100 and the pad 200 are made of titanium alloy. Using this material, the plasticity is high and it is harmless to the human body. The bolts are flat-head screws with a diameter of 4.5mm and a length of 16mm to 40mm, which can connect the pad 200 and the fixation block 100 into a whole. The fixation rod 302 is L-shaped, and the end that is fixed to the ischial spine or anterior superior iliac spine is threaded, which facilitates subsequent drilling and fixing of the fixation rod 302.

[0033] In summary, the working principle of this solution is as follows:

[0034] During the surgery, a suitable fixation plate 100, spacer 200, and several bolts are selected according to the size of the patient's acetabulum. The fixation plate 100 is placed at a predetermined position on the posterosuperior aspect of the acetabulum. Bolts are passed through the screw holes 101 and the sliding holes 102 at the ends away from the screw holes 101 on the fixation plate 100 to fix it on the posterosuperior aspect of the acetabulum. Then, the spacer 200 is placed in the acetabular fossa. Using the sliding holes 102 on the fixation plate 100, bolts are used to connect the spacer 200 to the fixation plate 100 from the outside in. Two fixation rods 302 are then used. The fixation rod 302 is fixed to the ischial spine and anterior superior iliac spine by drilling holes. The other end of the fixation rod 302 is fixed to the positioning plate 300 by nuts. The acetabular reamer is taken and the appropriate adjustment hole 301 is selected. The grinding head of the acetabular reamer is ground against the reduced acetabular fossa through the adjustment hole 301. After grinding, bone cement is filled into the pad 200. Then, the acetabular cup is pushed into the pad 200 through the same adjustment hole 301 using the auxiliary rod. Finally, the fixation rod 302 is removed, the positioning plate 300 is removed, and the femoral stem is processed and installed. Finally, the procedure is completed by routine suturing.

[0035] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0036] Therefore, the above description is only a preferred embodiment of this application and is not intended to limit the scope of this application; that is, all equivalent modifications made in accordance with the scope of the claims of this application shall be within the protection scope of the claims of this application.

Claims

1. A fixation structure for repairing the acetabulum, comprising a fixation plate (100) and a pad (200), characterized in that: The fixing plate (100) is fixed to the upper posterior part of the acetabulum to provide load-bearing capacity after reconstruction of the damaged acetabulum; the pad (200) is installed in the acetabular fossa to provide an installation environment for the acetabular cup; the fixing plate (100) and the pad (200) are fixed together by bolts; a detachable positioning plate (300) is provided on one side of the mounting opening of the pad (200), and the positioning plate (300) is used to adjust the installation angle of the acetabular cup.

2. The fixation structure for repairing the acetabulum according to claim 1, characterized in that: The fixing plate (100) is symmetrically provided with a plurality of sliding holes (102), and one end of the fixing plate (100) is provided with a screw hole (101).

3. The fixation structure for repairing the acetabulum according to claim 1, characterized in that: The fixing plate (100) is arched, and the inner side of the fixing plate (100) fits against the acetabulum.

4. The fixation structure for repairing the acetabulum according to claim 1, characterized in that: The pad (200) is an irregular hemispherical shape, and the pad (200) is filled with bone cement. The acetabular cup is fixed in the pad (200) by the bone cement.

5. The fixation structure for repairing the acetabulum according to claim 1, characterized in that: The pad (200) has several through holes (201) on its surface, and the pad (200) is installed at the arched inner bend of the fixing plate (100).

6. The fixation structure for repairing the acetabulum according to claim 1, characterized in that: Both the fixing plate (100) and the pad (200) are made of titanium alloy.

7. The fixation structure for repairing the acetabulum according to claim 1, characterized in that: The positioning plate (300) is provided with fixing rods (302) on both sides. One end of the fixing rod (302) is fixed to the ischial spine or anterior superior iliac spine, and the other end is fixed to the positioning plate (300) by a nut.

8. The fixation structure for repairing the acetabulum according to claim 1, characterized in that: The positioning plate (300) is also provided with a number of adjustment holes (301), which are used for grinding the bone around the grinding pad (200) and for positioning the subsequent acetabular cup.

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