Lateral Entry Insert for Reverse Shoulder Cup Trial
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Solution Overview
Problem
The challenge in reverse shoulder arthroplasty (RSA) is achieving proper soft tissue tension and joint stability, as traditional trialing procedures often require multiple attempts and can lead to joint instability and increased recovery time due to the need for repeated stretching of soft tissues during the insertion and removal of humeral components.
Innovation Solution
A trial assembly comprising a trial cup and insert that allows lateral engagement and disengagement, with a centering member and flanges that lock in place upon rotation, enabling the insert to slide transversely into the cup, minimizing soft tissue tension and facilitating joint reduction without stretching, and accommodating various sizes and surgeon preferences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional trialing procedures are used with repeated insertion and removal of humeral components, then multiple attempts can be made to determine correct insert height, but soft tissue stretching occurs leading to joint instability and increased recovery time
Solution Approach 1:
The trial insert is nested within the trial cup, allowing the insert to be securely held in position during trialing. The centering member with flanges fits within the insert's groove, creating a nested structure that prevents dislocation while maintaining stability. This eliminates the need for repeated insertion and removal of separate components.
Solution Approach 2:
The invention merges the trial insert and trial cup into a single integrated assembly that cannot be accidentally dislocated. The centering member with locking flanges combines the functions of positioning, centering, and securing the insert within the cup, creating a unified structure that maintains joint stability throughout the trialing process.
2Adaptability or versatility
If traditional trialing procedures require repeated stretching of soft tissue for component insertion and removal, then multiple insert height options can be evaluated, but recovery time increases
Solution Approach 1:
The correct insert height is determined during the trial assembly before final implantation. The trial insert with different height options allows the surgeon to evaluate and select the optimal height in advance, ensuring proper soft tissue tension is established before the actual surgery. This preliminary determination prevents the need for postoperative adjustments and reduces recovery time.
3Measurement precision
If multiple trial inserts with varying heights are used to optimize soft tissue tension, then correct insert height can be determined, but the procedure requires multiple joint dislocations
Solution Approach 1:
The trial cup is designed with a universal centering member that can accommodate multiple trial inserts of varying heights. The groove and flange design allows any trial insert to be securely positioned within the same cup, eliminating the need for multiple dislocations. The single dislocation event suffices for evaluating all insert height options.
Data Source
AI summary
Trials for a reverse shoulder system are described. The trials generally include an insert housed within a humeral cup. The insert has a proximal end and a distal end, the proximal end having a concave recess therein adapted to receive a glenosphere prosthesis. The distal end of the insert includes a shaft, the shaft is substantially housed within the confines of the humeral cup. A distal end of the humeral cup is inserted in a humeral stem.