Modular Shoulder Prosthesis Baseplate With Removable Collet Fixation
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Solution Overview
Problem
Existing shoulder joint implants face challenges in securing the glenosphere component to the scapula due to mismatched diameters between the bore of the metaglene component and the bone screw, leading to increased surgical complexity and backward incompatibility with standard glenoid/glenosphere components.
Innovation Solution
A modular shoulder joint implant design featuring a baseplate with a throughbore that accommodates a removable collet and optional bone screw, allowing for various configurations that include a collet alone or combined with a bone screw, facilitating secure attachment of the glenosphere component while maintaining compatibility with existing components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the proximal diameter of the bore is widened to accommodate the screw diameter, then the bone screw can be inserted through the bore, but this causes backward incompatibility with glenoid/glenosphere components having coupling elements with narrower widths
Solution Approach 1:
The invention divides the fastening function into two separate components: a collet that engages with the coupling element and a bone screw that provides additional anchoring. The collet has a reduced diameter to fit within the original bore dimensions, while the bone screw is inserted through a separate path or enlarged portion, allowing each component to optimize its function without compromising compatibility.
Solution Approach 2:
The collet acts as an intermediary component between the coupling element and the bone screw. It transmits the locking action while maintaining the original bore dimensions for compatibility, and simultaneously provides a mechanism to engage the bone screw for enhanced fixation when needed.
2Ease of operation
If a top-down or lateral approach is used to insert the screw through the bore, then the screw can be inserted, but the surgical procedure complexity increases
Solution Approach 1:
The fastening system is segmented into the collet and bone screw as separate functional elements. The collet is inserted first through the original bore using standard techniques, and the bone screw is added subsequently through a simplified path, breaking down the complex single-step insertion into two simpler sequential steps.
Solution Approach 2:
The collet is installed first as a preliminary action before the bone screw is inserted. This preliminary installation establishes the primary connection and creates a prepared state that simplifies the subsequent bone screw insertion, allowing the surgeon to add the screw through a more direct approach.
Data Source
AI summary
Shoulder joint implants are disclosed herein for use in shoulder reconstruction that are configured to facilitate the inclusion a central bone screw for augmented bone fixation. The implant can include a baseplate (or metaglene) configured to secure a glenosphere or other prosthetic component to the glenoid. To facilitate lateral or proximal insertion of a central bone screw through the implant, a throughbore defined along the central axis of the metaglene can be widened to accommodate the maximum diameter of the screw. To enable fixation of the glenosphere to the metaglene, a collet can be configured to engage the smaller diameter of a glenosphere coupling element and inserted into the central throughbore. The collet and the bone screw can be separate parts, thereby making insertion of the bone screw optional. Alternatively, the collet and bone screw can be integrated together to form a unitary construct.