Surface replacement instrument device for acromion impingement after huge rotator cuff injury

Abstract

The utility model relates to the technical field of orthopedic medical instruments, in particular to a surface replacement instrument device for acromion impact after huge rotator cuff injury, which can eliminate acromion lower impact when a humerus head moves and is beneficial to recovery after the rotator cuff injury. The humerus prosthesis comprises a metal hemispherical prosthesis fixed to the top of a humerus and a metal strip-shaped prosthesis fixed to the end of an acromion, a clamping groove is formed in the lower portion of the metal strip-shaped prosthesis, a ceramic prosthesis is embedded in the clamping groove, and the bottom of the ceramic prosthesis is a spherical surface matched with the metal hemispherical prosthesis.

Description

Technical Field

[0001] The utility model relates to the technical field of orthopedic medical instruments, in particular to a surface replacement instrument for shoulder impingement syndrome following giant rotator cuff injury. Background Art

[0002] Giant rotator cuff tears have always been a difficult problem in clinical treatment. Due to the large defect, direct repair under arthroscopy is often not possible. Since it is difficult to re-establish effective rotator cuff tendon-bone healing, there is also a high risk of re-rupture and poor prognosis after primary repair. Even if the shoulder instability caused by giant rotator cuff tears is corrected by tendon reconstruction or upper joint capsule reconstruction with one end of the artificial graft fixed to the upper edge of the glenoid and the other end fixed to the rotator cuff footprint, there are still problems such as wear and fibrosis degeneration during repeated shoulder activities. Summary of the invention

[0003] In order to solve the existing problem of acromion impingement after rotator cuff injury, the utility model provides a surface replacement device for acromion impingement after huge rotator cuff injury, which can eliminate subacromial impingement during humeral head movement and is beneficial to the recovery after rotator cuff injury.

[0004] The technical solution is as follows: a surface replacement device for acromion impingement syndrome after massive rotator cuff injury, characterized in that it includes a metal hemispherical prosthesis fixed to the top of the humerus and a metal strip prosthesis fixed to the end of the acromion, a slot is provided at the bottom of the metal strip prosthesis, a ceramic prosthesis is embedded in the slot, and the bottom of the ceramic prosthesis is a spherical surface that matches the metal hemispherical prosthesis.

[0005] It is further characterized in that the front end of the bottom of the ceramic prosthesis is provided with an arc-shaped protrusion;

[0006] The top surface of the metal strip prosthesis is coated with a hydroxyapatite coating;

[0007] The metal strip prosthesis is fixed to the acromion by screws;

[0008] The greater tuberosity and the humeral head of the humerus are provided with a cylindrical notch, and the bottom of the metal hemispherical prosthesis is provided with a fixing head which matches the cylindrical notch and has a hydroxyapatite coating on the surface and is fixed by bone cement;

[0009] The side wall of the columnar notch is provided with a side notch, and the side portion of the fixing head is provided with an anti-rotation wing embedded in the side notch.

[0010] After adopting the utility model, a metal strip prosthesis is added to the end of the acromion, the lower articular surface of the acromion is extended, and a ceramic prosthesis is embedded on the metal strip prosthesis to cooperate with the metal hemispherical prosthesis on the top of the humerus, thereby avoiding the collision of the humeral head with the acromion during movement, protecting the rotator cuff tearing position, and being beneficial to the recovery after injury. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the utility model;

[0012] Figure 2 Schematic diagram of the combination of metal strip prosthesis and ceramic prosthesis. DETAILED DESCRIPTION

[0013] See Figure 1 , Figure 2 As shown, a surface replacement device for acromion impingement syndrome after massive rotator cuff injury includes a metal hemispherical prosthesis 2 fixed to the top of the humerus 1 and a metal strip prosthesis 4 fixed to the end of the acromion 3. The metal strip prosthesis 4 is fixed to the acromion 3 by three screws 8 arranged in a triangle. A dovetail-shaped slot 5 is provided at the bottom of the metal strip prosthesis 4, and a ceramic prosthesis 6 is embedded in the slot 5. The bottom of the ceramic prosthesis 6 is a spherical surface that matches the metal hemispherical prosthesis 2.

[0014] The front end of the bottom of the ceramic prosthesis 6 is provided with an arc-shaped protrusion 7. The slightly convex design can press the humeral head on the outside to further reduce the displacement, and the contact between the arc surface and the spherical surface can play a lever role.

[0015] The top surface of the metal strip prosthesis 4 is coated with a hydroxyapatite coating, which can promote the formation of new bones.

[0016] In order to facilitate the installation of the metal hemispherical prosthesis 2, a cylindrical notch is opened on the greater tuberosity and the humeral head of the humerus 1 to expose the cancellous bone at the bottom of the greater tuberosity, and then the fixing head at the bottom of the metal hemispherical prosthesis is inserted, and the surface of the fixing head is provided with a hydroxyapatite coating, and finally fixed with bone cement;

[0017] In order to prevent the metal hemispherical prosthesis 2 from rotating, a side notch is provided on the side wall of the cylindrical notch, and an anti-rotation wing embedded in the side notch is provided on the side of the fixing head.

Claims

1. A surface replacement device for shoulder impingement after massive rotator cuff injury, characterized in that: The invention comprises a metal hemispherical prosthesis fixed to the top of the humerus and a metal strip prosthesis fixed to the end of the acromion. A slot is provided at the bottom of the metal strip prosthesis, a ceramic prosthesis is embedded in the slot, and the bottom of the ceramic prosthesis is a spherical surface matched with the metal hemispherical prosthesis.

2. The surface replacement device for shoulder impingement after massive rotator cuff injury according to claim 1, characterized in that: An arc-shaped protrusion is arranged at the front end of the bottom of the ceramic prosthesis.

3. The surface replacement device for shoulder impingement after massive rotator cuff injury according to claim 1, characterized in that: The top surface of the metal strip prosthesis is coated with a hydroxyapatite coating.

4. The surface replacement device for shoulder impingement after massive rotator cuff injury according to claim 1, characterized in that: The metal strip prosthesis is fixed to the acromion by screws.

5. The surface replacement device for shoulder impingement after massive rotator cuff injury according to claim 1, characterized in that: The greater tuberosity and the humeral head of the humerus are provided with columnar notches, and the bottom of the metal hemispherical prosthesis is provided with a fixing head which matches the columnar notch and has a hydroxyapatite coating on the surface and is fixed by bone cement.

6. The surface replacement device for shoulder impingement after massive rotator cuff injury according to claim 5, characterized in that: The side wall of the columnar notch is provided with a side notch, and the side portion of the fixing head is provided with an anti-rotation wing embedded in the side notch.

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