Modular Reverse Shoulder Prosthetic With Locking Bearing Coupling
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Solution Overview
Problem
Conventional humeral implants fail to accommodate patients with inadequate skeletal structure during revision procedures, particularly in allowing proper articulation between the implant and the coracoacromial arch of the scapula, leading to suboptimal articulation dynamics.
Innovation Solution
A modular reverse shoulder prosthetic system featuring a glenoid tray with a coupling aperture and a bearing coupling member that includes a locking surface and a coupling flange, allowing for adjustable articulation and secure engagement with the humeral shaft and head, enabling revision of the articulation surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional humeral implants are used, then the implant structure is simple, but the articulation dynamics are suboptimal due to inability to accommodate patients with inadequate skeletal structure
Solution Approach 1:
The implant is divided into multiple modular components including a glenoid tray, bearing coupling member, and bearing member that can be assembled together. This segmentation allows each component to be optimized independently while providing adaptability for revision procedures in patients with inadequate skeletal structure.
Solution Approach 2:
The glenoid tray is designed with a coupling aperture that can accommodate different bearing coupling members and configurations, making it a universal base component that serves multiple functions including primary fixation, articulation support, and revision capability across different patient anatomies.
2Ease of repair
If conventional implants are used, then the manufacturing process is simple, but the revision capability is limited
Solution Approach 1:
The bearing coupling member includes a locking mechanism with a locking surface that can be engaged or disengaged to secure or release the bearing member. This dynamic locking capability enables easy revision by allowing the bearing components to be locked in place during normal operation but readily released when revision is needed.
Solution Approach 2:
The bearing coupling member acts as an intermediary component between the glenoid tray and the bearing member, providing a standardized interface with the coupling aperture and locking surface that mediates the connection and enables straightforward revision without affecting the underlying glenoid tray or humeral components.
3Reliability
If the coupling aperture has a single diameter, then the manufacturing is simple, but the locking mechanism cannot engage properly
Solution Approach 1:
The coupling aperture is designed with non-uniform diameter, featuring a first diameter in the first portion and a second diameter in the second portion, where the diameters differ. This local variation in geometry provides a specific locking surface at the interface between portions, enabling reliable engagement of the locking mechanism while maintaining a relatively simple overall aperture structure.
Data Source
AI summary
A reverse modular humeral implant for implantation into a humerus that includes a natural humeral shaft and a natural humeral head. The implant includes a humeral stem implantable into the natural humeral shaft, and an adapter couplable to the humeral stem, the adapter including an anchoring projection configured to be coupled to a convex bearing.