Humerus handle beneficial to large and small tubercle reconstruction

Abstract

The utility model discloses a humerus handle beneficial to large and small tubercle reconstruction, which comprises a humerus prosthesis handle, a cover plate and a fixing screw, a screw hole is arranged on the humerus prosthesis handle, a joint surface is fixed on the humerus prosthesis handle, the joint surface is matched with a cambered surface joint head, and the cover plate is fixed on the cover plate. The humerus prosthesis handle is mutually fixed with a human body bone block through the cover plate and the fixing screw. According to the humerus handle beneficial to large and small tubercle reconstruction, the overall operation is simple, a doctor does not need to conceal a suture binding mode and a mechanical structure when a patient moves later, compared with a traditional suture binding mode, the risk that bone fragments are separated from the binding position is high, the design has no risk, fixation is firm, the humerus prosthesis handle is made of a titanium alloy material, and the use is convenient. The screw and the cover plate are also made of titanium alloy materials, biocompatibility is guaranteed, meanwhile, strength is achieved, the cover plate and the screw are in spherical connection, the device can better adapt to the shape of a bone block, and the adaptability of the device is improved.

Description

Technical Field

[0001] This utility model relates to the field of shoulder joint replacement surgery technology, specifically a humeral stem that facilitates the reconstruction of the greater and lesser tubercles. Background Technology

[0002] Total shoulder arthroplasty is a surgical procedure to replace a damaged or degenerated shoulder joint, aiming to relieve pain, restore shoulder function, and improve quality of life. This surgery is commonly used to treat various shoulder conditions, such as osteoarthritis of the shoulder, rotator cuff tears, or other degenerative joint diseases, and is mainly divided into the following three types:

[0003] Total shoulder arthroplasty: Also known as anatomical shoulder arthroplasty, this surgery involves replacing the entire shoulder joint with an artificial joint, including the humeral head and the glenoid fossa of the scapula. During the surgery, the surgeon removes the damaged humeral head and replaces it with an artificial humeral head, while the glenoid fossa of the scapula is also replaced with an artificial glenoid fossa.

[0004] Inverted shoulder arthroplasty, also known as reverse shoulder replacement, involves reversing the positions of the ball and socket of the shoulder joint. The ball-shaped portion of the humeral head is placed within the concave socket of the scapula, while the concave portion of the scapula is replaced by the ball-shaped portion of the humeral head. Inverted shoulder arthroplasty is typically used for patients with severe rotator cuff injuries or loss of function, particularly those who cannot regain function through conventional total shoulder arthroplasty.

[0005] Hemiarthroplasty: This surgery replaces only the humeral head while preserving the glenoid fossa of the scapula. Hemiarthroplasty is suitable for patients with only humeral head damage, while the glenoid fossa of the scapula remains intact.

[0006] In human anatomy, the supraspinatus, infraspinatus, and teres minor muscles attach near the greater tuberosity, while the subscapularis muscle attaches to the lesser tuberosity. In some injuries, severe proximal humeral injuries can cause the greater and lesser tuberosities to detach from the humeral shaft, forming fragments. All three types of shoulder replacement surgery involve reconstruction of the greater and lesser tuberosities. This is typically achieved by using surgical sutures to bind the fragmented bone tissue around the prosthesis. Commercially available artificial shoulder prostheses often have pre-drilled holes for suture binding and insertion. However, this method presents the following problems:

[0007] 1. Due to the elasticity of sutures, bone fragments may experience significant relative movement during stress, which is detrimental to bone tissue healing.

[0008] 2. The surgical procedure is complex and difficult to perform;

[0009] Therefore, to address the above issues, a humeral stem that facilitates the reconstruction of the greater and lesser tubercles is designed to better meet practical application needs. Utility Model Content

[0010] The purpose of this invention is to provide a humeral stem that facilitates the reconstruction of the greater and lesser tubercles, thereby solving the problems mentioned in the background art.

[0011] To achieve the above objectives, this utility model provides the following technical solution: a humeral stem that facilitates the reconstruction of greater and lesser tubercles, comprising a humeral prosthesis stem, a cover plate, and fixing screws. The humeral prosthesis stem has screw holes, and an articular surface is fixed on the humeral prosthesis stem, with the articular surface cooperating with the arcuate articular head. The humeral prosthesis stem is fixed to the human bone block by the cover plate and fixing screws.

[0012] Preferably, the humeral prosthesis stem, cover plate, and fixation screw are all made of titanium alloy. By limiting the materials of the humeral prosthesis stem, cover plate, and fixation screw, both biocompatibility and installation strength can be guaranteed.

[0013] Preferably, there are no fewer than three screw holes on the humeral prosthesis stem, and the screw holes and fixing screws are distributed in a one-to-one correspondence. Through the above structure, the stability of the entire device installation and fixation can be guaranteed.

[0014] Preferably, the cover plate is uniformly fixed with anti-slip teeth, and the anti-slip teeth contact the human bone blocks to achieve the anti-slip effect. Through the action of the anti-slip teeth, the stability of the connection between the cover plate and the human bone blocks can be guaranteed.

[0015] Preferably, the cover plate is also provided with through holes evenly spaced, and a concave spherical surface is provided in the middle of the cover plate. Through the above structure, the normal use of the device can be guaranteed.

[0016] Preferably, the end of the fixing screw is provided with a convex spherical surface, and the convex spherical surface cooperates with the concave spherical surface. By cooperating with the concave spherical surface, the fixing screw and the cover plate can be installed at a certain angle, which better meets the installation requirements of human bone blocks.

[0017] Compared with the prior art, the beneficial effects of this utility model are: the humeral stem that facilitates the reconstruction of the greater and lesser tubercles is simple to operate, and doctors no longer need to consider the binding method of sutures and the mechanical structure during patient movement. Compared with traditional suture binding, the risk of bone fragments detaching from the binding position is high. This design does not have this risk and is firmly fixed. The humeral prosthesis stem is made of titanium alloy, and the screws and cover plates are also made of titanium alloy, which ensures biocompatibility while also providing strength. Furthermore, the cover plate and screws are connected by a ball joint, which can better adapt to the shape of the bone fragments and improve the adaptability of the device. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall exploded three-dimensional structure of the device of this utility model;

[0019] Figure 2 This is a bottom-view, exploded three-dimensional structural diagram of the overall composition of the device of this utility model;

[0020] Figure 3 This is a schematic diagram of the three-dimensional structure of the cover plate of this utility model.

[0021] In the diagram: 1. Humeral prosthesis stem; 2. Screw hole; 3. Articular surface; 4. Cover plate; 401. Anti-slip teeth; 402. Through hole; 403. Concave spherical surface; 5. Fixing screw; 501. Convex spherical surface. Detailed Implementation

[0022] 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.

[0023] Please see Figures 1-3 This utility model provides a technical solution: a humeral stem that facilitates the reconstruction of greater and lesser tubercles, including a humeral prosthesis stem 1, a cover plate 4 and a fixing screw 5. The humeral prosthesis stem 1 has a screw hole 2, and an articular surface 3 is fixed on the humeral prosthesis stem 1. The articular surface 3 cooperates with the arcuate articular head. The humeral prosthesis stem 1 is fixed to the human bone block by the cover plate 4 and the fixing screw 5.

[0024] The humeral prosthesis stem 1, cover plate 4, and fixing screw 5 are all made of titanium alloy; there are no fewer than 3 screw holes 2 on the humeral prosthesis stem 1, and the screw holes 2 and fixing screw 5 are distributed in a one-to-one correspondence; anti-slip teeth 401 are evenly fixed on the cover plate 4, and the anti-slip teeth 401 contact the human bone block to achieve the anti-slip function; through holes 402 are also evenly opened on the cover plate 4, and an inward concave spherical surface 403 is provided in the middle position of the cover plate 4; a convex spherical surface 501 is provided at the end of the fixing screw 5, and the convex spherical surface 501 cooperates with the inward concave spherical surface 403;

[0025] When using a humeral stem that facilitates reconstruction of the greater and lesser tubercles, such as Figures 1-3As shown, firstly, holes are drilled in the human bone block according to the installation requirements of the humeral prosthesis stem 1. Then, the humeral prosthesis stem 1 is inserted and installed into the human bone block. Finally, the installation and locking are achieved by connecting the fixing screw 5 through the round hole and screw hole 2 on the cover plate 4 and the human bone block. During the installation process, the cooperation between the convex spherical surface 501 and the concave spherical surface 403 allows the cover plate 4 and the fixing screw 5 to be installed without being perpendicular. That is, the cover plate 4 and the fixing screw 5 can be installed at an angle within a certain range, so as to better adapt to the shape of the human bone block for fixation. After installation, the anti-slip teeth 401 contact with the human bone block to achieve an anti-slip effect and ensure the stability of the device installation. This is the working principle of the humeral stem that is beneficial for the reconstruction of the greater and lesser tubercles.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A humeral stem facilitating the reconstruction of greater and lesser tubercles, comprising a humeral prosthesis stem (1), a cover plate (4), and fixation screws (5), characterized in that: The humeral prosthesis stem (1) has screw holes (2) and articular surfaces (3) are fixed on the humeral prosthesis stem (1). The articular surfaces (3) cooperate with the arcuate articular head. The humeral prosthesis stem (1) is fixed to the human bone block by a cover plate (4) and fixing screws (5).

2. The humeral stem facilitating reconstruction of the greater and lesser tubercles according to claim 1, characterized in that: The humeral prosthesis stem (1), cover plate (4), and fixing screw (5) are all made of titanium alloy.

3. The humeral stem facilitating reconstruction of the greater and lesser tubercles according to claim 1, characterized in that: There are no fewer than three screw holes (2) on the humeral prosthesis stem (1), and the screw holes (2) and the fixing screws (5) are distributed in a one-to-one correspondence.

4. The humeral stem facilitating reconstruction of the greater and lesser tubercles according to claim 1, characterized in that: The cover plate (4) is uniformly fixed with anti-slip teeth (401), and the anti-slip teeth (401) contact the human bone blocks to achieve the anti-slip effect.

5. The humeral stem facilitating reconstruction of the greater and lesser tubercles according to claim 1, characterized in that: The cover plate (4) is also provided with through holes (402) evenly, and a concave spherical surface (403) is provided in the middle position of the cover plate (4).

6. The humeral stem facilitating reconstruction of the greater and lesser tubercles according to claim 5, characterized in that: The end of the fixing screw (5) is provided with a convex spherical surface (501), and the convex spherical surface (501) cooperates with the concave spherical surface (403).

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