Reverse Shoulder Prosthesis Deep Articulation Stability
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Solution Overview
Problem
Current reverse shoulder prostheses face issues with luxations, wear, and unstable anchorage, and the snap fit connection during surgery can be challenging, leading to prolonged and invasive procedures.
Innovation Solution
A reverse-type total shoulder prosthesis with a deep concave component in the humerus and a spherical convex component on the scapula, featuring a press-fit and bone-ingrowth fixation, along with a tubular screw anchor that securely attaches to the scapula, providing enhanced stability and reduced wear, and a simplified surgical method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a shallow concave component is used in reverse shoulder prosthesis, then the snap fit connection during surgery is easier, but the stability and range of movement are limited
Solution Approach 1:
The patent inverts the conventional reverse prosthesis design by placing the deep concave component in the humerus and the convex spherical head on the scapula, rather than the traditional shallow configuration. This inversion allows for deep coverage (180-200°) of the spherical head while maintaining ease of snap-fit connection during surgery, thereby achieving both stability and operational ease.
2Stability of the object's composition
If a deep concave component with 180°-200° coverage is used, then the stability and range of movement are improved, but the snap fit connection during surgery becomes difficult
Solution Approach 1:
By inverting the traditional design configuration, the patent achieves deep coverage (180-200°) of the spherical head while maintaining ease of snap-fit connection. The deep concave component in the humerus and convex head on the scapula arrangement allows superior stability and range of movement without compromising surgical ease.
3Length of moving object
If conventional reverse-type prosthesis with large radius flat head is used, then the center of rotation is shifted proximally, but the articulation depth is insufficient leading to luxations
Solution Approach 1:
The patent inverts the conventional design by placing the deep concave component in the humerus and convex spherical head on the scapula. This creates a deep spherical articulation with adequate coverage (180-200°) that provides superior resistance to luxation while maintaining the proximal center of rotation position characteristic of reverse-type prostheses.
4Ease of manufacture
If shallow articulation is used in either anatomical or reverse-type prosthesis, then the surgical procedure is simpler, but the stability is limited
Solution Approach 1:
The patent inverts the traditional shallow articulation design by implementing a deep spherical articulation with 180-200° coverage. The deep concave component in the humerus and convex head on the scapula provide superior stability and range of movement while maintaining surgical simplicity through the snap-fit connection mechanism.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution offers superior stability, reduced wear, and a more efficient, less invasive surgical procedure with lower costs and improved clinical outcomes for both humans and animals, while ensuring a wide range of impingement-free movement.
Implementation Method 1
fixed by press fit into reamed-out cancellous bony bed
Implementation Method 2
followed by secondary stabilization by bone ingrowth
Implementation Method 3
inserted into the scapula through the subchondral bone of the glenoid cavity and then along the long axis of the scapula, partially cutting into all three flat bones forming the triad of the scapula
Data Source
Figure 1a~1b
Figure 2
Figure 3
AI summary
The invention relates to a total prosthesis for the shoulder joint. It is of the socalled reverse type with a concave component in the humerus and a convex component on the scapula.