Acetabular prosthesis capable of adjusting direction of screw

Abstract

The utility model relates to the technical field of medical instruments, and discloses an acetabular prosthesis capable of adjusting the direction of a screw, which comprises an acetabular cup and a filling block connected with the acetabular cup, the acetabular cup comprises an acetabular opening and a cup body connected with the acetabular opening, the acetabular opening is round, the cup body is of a hemispherical structure matched with the acetabular opening, the cup body is of a truss type pore structure, and a sliding groove matched with the filling block is formed in the cup body; the filling block comprises a solid area and a porous area arranged on the inner side of the solid area, the porous area is of a truss type pore structure, screw grooves are formed in the filling block, and screws are movably arranged in the screw grooves. The screw is of a solid structure, and cancellous bone fixing threads are arranged on the screw. And the thickness of the cup body is 5mm. And the width of the filling block is 10mm. And the pore diameter of the truss-type pore structure of the cup body is any even number within 40-82mm. The filling block of the acetabular prosthesis can be secondarily adjusted, the position and the direction of the screw can be determined, and the requirements for the position and the direction during screw placement are met.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to an acetabular prosthesis with adjustable screw directions. Background Art

[0002] Hip replacement surgery is an effective method for treating hip joint diseases developed in the mid-20th century. Initially, hip replacement surgery was mainly used for patients with diseases such as elderly hip fractures and femoral head necrosis. With the continuous improvement of surgical techniques and the improvement of prosthetic materials, the scope of indications for hip replacement surgery has gradually expanded to include diseases such as hip dysplasia, hip osteoarthritis, and hip infection.

[0003] Hip replacement surgery is widely used in medical practice, and the acetabular prosthesis is an important part of hip replacement surgery. Its structural design and fixation method directly affect the surgical effect and the patient's recovery. Traditional acetabular prostheses often have problems such as a single structure and limited fixation methods. Therefore, an acetabular prosthesis with a more reasonable structure and more convenient use is needed. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the utility model provides an acetabular prosthesis with adjustable screw direction, which solves the problems of single structure and limited fixing method of acetabular prosthesis in the prior art.

[0005] In order to achieve the above-mentioned purpose of the utility model, the technical solution adopted by the utility model is: an acetabular prosthesis with adjustable screw direction, comprising an acetabular cup and a filling block connected to the acetabular cup;

[0006] The acetabular cup includes an acetabular opening and a cup body connected to the acetabular opening. The acetabular opening is circular in shape, and the cup body is a hemispherical structure matching the acetabular opening. The cup body is a truss-type pore structure, and a slide groove matching the filling block is arranged on the cup body.

[0007] The filling block comprises a solid area and a porous area arranged inside the solid area. The porous area is a truss-type pore structure. A screw groove is arranged on the filling block, and a screw is movably arranged in the screw groove.

[0008] The beneficial effects of the utility model are as follows: the cup body and porous area of ​​the filling block of the acetabular cup adopt a truss-type pore structure, which reduces the weight while maintaining the overall strength, reduces the pressure on the surrounding bones, and thus reduces the risk of fractures; the cup body and the porous area are porous structures, which are intended to promote bone growth and achieve the purpose of long-term fixation after implantation. The filling block has a variety of specifications, and the parameters are designed according to the acetabular cup to be adapted. The position of the filling block where the screw slot is located is different to ensure that the screw is in different positions on the acetabular cup.

[0009] Furthermore, in the above-mentioned acetabular prosthesis with adjustable screw direction, the screw is a solid structure, and a cancellous bone fixing thread is arranged on the screw.

[0010] The beneficial effects of adopting the above further solution are: the screw is a solid structure, has a cancellous bone fixing thread, has self-tapping ability, and can be inserted into the bone by rotating itself. The cancellous bone thread can ensure that the screw has a better holding force in the cancellous bone and prevent the screw from falling off.

[0011] Furthermore, in the above-mentioned acetabular prosthesis with adjustable screw direction, the thickness of the cup body is 5 mm.

[0012] The beneficial effect of adopting the above further solution is that the thickness of 5 mm provides sufficient rigidity and support for the acetabular prosthesis, which helps to maintain the stability of the prosthesis during and after the operation.

[0013] Furthermore, in the above-mentioned acetabular prosthesis with adjustable screw direction, the width of the filling block is 10 mm.

[0014] The beneficial effect of adopting the above further solution is: since a screw groove is provided on the filling block, the width of the filling block is 10 mm and screws of various diameters can be provided.

[0015] Furthermore, in the above-mentioned acetabular prosthesis with adjustable screw direction, the pore diameter of the cup-body truss-type pore structure is any even number within the range of 40 mm-82 mm.

[0016] The beneficial effect of adopting the above further scheme is that the appropriate size of the pore diameter can reduce the stress shielding effect on the surrounding bone, maintain the biomechanical properties of the bone, and help maintain bone density.

[0017] Furthermore, in the above-mentioned acetabular prosthesis with adjustable screw direction, the length of the screw is any even number within the range of 14 mm-120 mm, and the cross-sectional diameter of the screw is any even number within the range of 4 mm-10 mm.

[0018] The beneficial effect of adopting the above further scheme is that the wide range of lengths and diameters can adapt to the anatomical structure of the hip bones of different patients, providing more options to meet the needs of different patients.

[0019] The beneficial effects of the utility model are as follows: the acetabular cup of the acetabular prosthesis adopts a hemispherical structure, which matches the circular shape of the acetabulum opening, providing better biomechanical properties and range of joint motion. The cup body and the porous area adopt a truss-type pore structure, which can improve the mechanical strength of the prosthesis while reducing weight and reducing pressure on the surrounding bone. The acetabular prosthesis has various models and specifications to meet the needs of different surgical options, and is produced by 3D printing to meet product strength and bone ingrowth requirements. The acetabular cup is equipped with multiple slides for adjusting the direction and position of the screws during surgery. The filling block can adjust and determine the position and direction of the screws for secondary adjustment to meet the requirements for position and direction when the screws are placed. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the structure of the acetabular prosthesis;

[0021] Figure 2 is a schematic diagram of the cross-sectional structure of an acetabular prosthesis;

[0022] Figure 3 It is a structural diagram of the filling block;

[0023] Figure 4 It is a structural diagram of the filling block;

[0024] Figure 5 is a schematic diagram of the structure of a screw;

[0025] Wherein: 1. acetabular cup, 2. filling block, 3. acetabular opening, 4. cup body, 5. slide groove, 6. solid area, 7. porous area, 8. screw groove, 9. screw. DETAILED DESCRIPTION

[0026] The specific implementation methods of the utility model are described below to facilitate technical personnel in this technical field to understand the utility model, but it should be clear that the utility model is not limited to the scope of the specific implementation methods. For ordinary technical personnel in this technical field, as long as various changes are within the spirit and scope of the utility model defined and determined by the attached claims, these changes are obvious, and all utility model creations using the concept of the utility model are protected.

[0027] like Figure 1 As shown, this embodiment provides an acetabular prosthesis with adjustable screw direction, comprising an acetabular cup 1 and a filling block 2 connected to the acetabular cup 1;

[0028] The acetabular cup 1 includes an acetabular opening 3 and a cup body 4 connected to the acetabular opening 3. The acetabular opening 3 is circular in shape and is a solid structure to ensure its roundness. The cup body 4 is a hemispherical structure that matches the acetabular opening 3. The cup body 4 is a truss-type pore structure. The pore diameter of the truss-type pore structure of the cup body 4 is any even number between 40 mm and 82 mm, which is intended to promote bone growth and achieve long-term fixation after implantation. The cup body 4 is 5 mm thick and is provided with a chute 5 that matches the filling block 2. The edge of the chute 5 is a solid structure to ensure its strength.

[0029] The filling block 2 includes a solid area 6 and a porous area 7 arranged inside the solid area 6. The porous area 7 is a truss-type pore structure. A screw groove 8 is arranged on the filling block 2, and a screw 9 is movably arranged in the screw groove 8. The width of the filling block 2 is 10 mm, and its structural shape is a concentric arc surface, which is used to cooperate with the arc surface of the acetabular cup 1. The filling block 2 has a variety of specifications, and the parameters are designed according to the acetabular cup 1 to be adapted. The filling block 2 is used in pairs and has different lengths to ensure that the screw 9 is in different positions on the acetabular cup 1. The screw 9 is a solid structure, and a cancellous bone fixing thread is arranged on the screw 9. The length of the screw 9 is any even number within 14 mm-120 mm, and the cross-sectional diameter of the screw 9 is any even number within 4 mm-10 mm. The screw 9 has a self-tapping ability and can be inserted into the bone by rotating itself. At the same time, the cancellous bone thread can ensure that the screw 9 has a better holding force in the cancellous bone to prevent the screw 9 from falling off.

[0030] When in use, the first step is to process the bone bed according to the size of the patient's acetabulum, meet the minimum bone removal amount, and at the same time achieve the optional acetabular cup 1 specification;

[0031] The second step is to insert the acetabular cup 1 using a gripper and tap it to stabilize it. While inserting it, the position and direction of the slide groove 5 on the acetabular cup 1 are adjusted to determine the direction and position of the screw 9 for the first time.

[0032] The third step is to select the filling block 2 corresponding to the acetabular cup 1 and place it in the corresponding chute 5, and adjust the position, and finally select the appropriate filling block 2, the filling blocks 2 are paired in pairs, and the screw grooves 8 are relatively placed in the chute 5 of the acetabular cup 1, and the position of the circular hole formed by them determines the final position and direction of the screw 9;

[0033] Step 4: After selecting a suitable slider and adjusting its position, use a hexagonal wrench to align the screw 9 with the screw slot 8 formed by the filling block 2 and rotate it to insert it. The self-tapping ability of the screw 9 enters the cancellous bone during the rotation process and relies on the cancellous bone thread to hold the cancellous bone and prevent it from falling off, thereby achieving fixation and locking;

[0034] The fifth step is to select and determine a suitable filling block 2 according to the above method, and complete the implantation of the screws 9 on the other slide grooves 5 of the acetabular cup 1.

Claims

1. An acetabular prosthesis with adjustable screw direction, characterized in that: It comprises an acetabular cup (1) and a filling block (2) connected to the acetabular cup (1); The acetabular cup (1) comprises an acetabular opening (3) and a cup body (4) connected to the acetabular opening (3); the acetabular opening (3) is circular in shape; the cup body (4) is a hemispherical structure matching the acetabular opening (3); the cup body (4) is a truss-type pore structure; and a slide groove (5) matching the filling block (2) is provided on the cup body (4); The filling block (2) comprises a solid region (6) and a porous region (7) arranged inside the solid region (6); the porous region (7) is a truss-type pore structure; a screw groove (8) is arranged on the filling block (2); a screw (9) is movably arranged in the screw groove (8).

2. The acetabular prosthesis with adjustable screw direction according to claim 1, characterized in that: The screw (9) is a solid structure, and a cancellous bone fixing thread is provided on the screw (9).

3. The acetabular prosthesis with adjustable screw direction according to claim 1, characterized in that: The cup body (4) has a thickness of 5 mm.

4. The acetabular prosthesis with adjustable screw direction according to claim 1, characterized in that: The width of the filling block (2) is 10 mm.

5. The acetabular prosthesis with adjustable screw direction according to claim 1, characterized in that: The pore diameter of the truss-type pore structure of the cup body (4) is any even number between 40 mm and 82 mm.

6. The acetabular prosthesis with adjustable screw direction according to claim 2, characterized in that: The length of the screw (9) is any even number between 14 mm and 120 mm, and the cross-sectional diameter of the screw (9) is any even number between 4 mm and 10 mm.

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