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Shoulder joint prosthesis

A shoulder joint and prosthesis technology, applied in the field of shoulder joint prosthesis, can solve problems such as loose glenoid components and lack of stability in reverse shoulder joint replacement

Inactive Publication Date: 2018-11-09
UNIV HOSPITALS COVENTRY & WARWICKSHIRE NHS TRUST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In severe cases, the scapular notch may lead to loosening of the glenoid component in arthroplasty
Like all shoulder replacements, reverse shoulder replacements may lack stability

Method used

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  • Shoulder joint prosthesis
  • Shoulder joint prosthesis
  • Shoulder joint prosthesis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0064] figure 1 An expanded view showing the components of a prosthesis 1 comprising a first cup 2 and a second cup 3 and a plate 4 held between the first cup 2 and the second cup 3 . The first cup 2 , the second cup 3 and the plate 4 are located between the ball member 5 and the humeral stem 6 .

[0065] The prosthesis is a reverse shoulder prosthesis. Thus in use the ball member 5 is secured to the patient's scapula and the stem 6 is introduced into the humerus.

[0066] Figure 2a and Figure 2b A first cup 2 comprising a convex 7 and a concave 8 is shown. In use, the concave surface 8 is adapted to move freely around the ball member 5 . The convex surface 7 is adapted so that the plate 4 held constrained between the first cup 2 and the second cup 3 can move freely around the convex surface 7 . The first cup body 2 includes a support 9 extending outward around the outer edge of the first cup body 2 . The seat 9 extends completely around the circumference of the firs...

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Abstract

A reverse shoulder joint prosthesis (1) for location between a humerus and a scapula comprised a ball (5) to be fixed to the scapula and a humeral stem 6 to be fixed to the humerus. The prosthesis comprises a first cup (2), a second cup (3) and a plate (4) retained between said cups. The first cup is free to move about the ball. The plate has a trunion (16) adapted to connect to the humeral stem through an aperture in the second cup. The plate is free to move between the cups. The prosthesis has a first phase of movement in which the plate moves between the cups and a distinct second phase ofmovement in which the first cup moves on the ball. The shoulder joint prosthesis provides an extended range of movement through the provision of two motion phases while minimising wear, scapula infringement and instability.

Description

technical field [0001] The present invention relates to a shoulder prosthesis for use in reverse shoulder replacements (ie, replacements in which a prosthetic ball is attached to the scapula). Background technique [0002] Reverse shoulder replacement is a well-established method of replacing the shoulder joint. In 2011, 42 percent of all major shoulder replacements in the United States were reverse shoulder replacements. One of the reasons shoulder replacements are so attractive is that they are better suited for use in patients with significant rotator cuff injuries. [0003] However, patients undergoing reverse shoulder replacement often suffer from a limited range of motion due to the relatively small range of motion of the replaced glenohumeral joint. Another common problem experienced after reverse shoulder replacement is impingement of the humeral component against the scapula, which causes scapular notching. In severe cases, the scapular notch may lead to loosenin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61F2/40A61F2/30
CPCA61F2/30A61F2/40A61F2/4014A61F2/4059A61F2/4081A61F2002/30331A61F2002/30518A61F2002/30649A61F2002/30662A61F2002/30663A61F2002/30878A61F2002/4085A61F2002/30654A61F2002/3069
Inventor 汤姆·劳伦斯理查德·金
Owner UNIV HOSPITALS COVENTRY & WARWICKSHIRE NHS TRUST
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