Reverse artificial shoulder prosthesis

Abstract

The invention discloses a reverse artificial shoulder prosthesis. The reverse artificial shoulder prosthesis includes a shoulder glenoid cavity (2), wherein multiple bolts (1) for being inserted into the shoulder blade are mounted at one side of the shoulder glenoid cavity (2); the other end of the shoulder glenoid cavity (2) is connected to a humerus assembly. The humerus assembly includes a humerus head (3), a humerus lining (4), a humerus plate (5) and a humerus handle (6), wherein the humerus head (3) is connected with the shoulder glenoid cavity (2), the side, near to the humerus head (3), of the humerus lining (4) is used for containing the humerus head (3), the humerus head (3) and the shoulder glenoid cavity (2) can rotate in the humerus lining (4), the side, near the humerus lining (4), of the humerus plate (5) is connected to the the humerus lining (4) in a locking mode, the proximal end of the humerus handle is connected to the humerus plate (5), the transverse section of the proximal end of the humerus handle is elliptic, and the distal end of the humerus handle is used for being implanted in the proximal end of a humeral medullary cavity. The reverse artificial shoulder prosthesis can keep not loose during long-term use and meanwhile reduce the impact of an inferior glenohumeral notch.

Description

technical field [0001] The invention relates to a medical prosthesis, in particular to a reverse artificial shoulder joint prosthesis. Background technique [0002] The reverse shoulder joint is used for joint replacement of shoulder joints with large rotator cuff injuries, shoulder fractures, and tumor shoulder joints. The reverse shoulder joint at this stage has been able to complete the surgical replacement very well, but its structure has been found in actual use. There are still some shortcomings, which cause this kind of reverse shoulder joint to fail to achieve the best use effect in practical applications, and its shortcomings can be summarized as follows: [0003] 1) Neglecting the natural shape of the proximal end of the medullary cavity, resulting in unnecessary damage to the patient's bone in actual use, or the risk of postoperative rotational loosening under the condition of external force; [0004] 2) The threaded fixation of the humeral lining and the humeral...

AI Technical Summary

Problems solved by technology

[0005] 3) It is impossible to completely avoid the impingement of the humerus lining on the subglenoid notch, there is a chance of impacting on the subglenoid notch, and there is a chance of glenoid loosening during normal postoperative activities;

[0006] 4) Surface spraying is really helpful for bone ingrowth, but the transmission of force has not been reduced. All the stress on the prosthesis during human activities will be transmitted to the host bone without reservation, and the prosthesis will loosen in the long run

[0007] The reverse shoulder joint at the present stage still has the problem of unstable joint function recovery after surgery. Since the glenoid component of the current reverse shoulder joint ignores the problem of osteoporosis after implantation, when the glenoid disc is installed under pressure, use Submergence of the contact surface of the glenoid disc into the host bone, resulting in insufficient abduction of the humeral head

The eccentricity of the downward movement of the shoulder glenoid components depends entirely on the doctor's experience. The current structure has a limited downward movement range, which may still impinge on the lower notch of the glenoid after surgery, and the intraoperative operation is very limited.

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