Adjustable Humeral Component for Shoulder Prosthesis
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Solution Overview
Problem
Current shoulder joint prostheses fail to optimize range of motion and adaptability for individual cases, particularly in conditions like osteoarthritis, trauma, and cuff tear arthropathy, and may not provide sufficient stability.
Innovation Solution
A modular shoulder arthroplasty system with a humeral component comprising a stem module and adjustable joint adapter, allowing for varying inclination angles and secure fixation, enabling use as either a joint replacement or reverse prosthesis, with features like radial arc shaped sections and locking mechanisms to enhance stability and positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed cup position is used in the humeral component, then the device structure is simple, but the range of motion and adaptability to individual cases are limited
Solution Approach 1:
The cup is made adjustable relative to the stem through a locking mechanism that allows the cup to be positioned at different angles and then locked in place. This dynamic adjustability enables adaptation to individual patient anatomy while maintaining structural integrity through the locking system
Solution Approach 2:
The humeral component is divided into separate modules: a stem with stem support surface and a separate cup with adapter support surface. This segmentation allows independent optimization of each component and enables angular adjustment between them to achieve optimal positioning for each patient
2Adaptability or versatility
If the cup is made adjustable to optimize range of motion, then adaptability improves, but device complexity increases
Solution Approach 1:
The adjustable mechanism allows the cup to be positioned at various angles relative to the stem during surgery, then locked in the optimal position. This provides dynamic adaptability for range of motion optimization while the locking mechanism maintains structural simplicity by eliminating the need for complex continuous adjustment systems
Solution Approach 2:
The stem support surface and adapter support surface are pre-configured with specific geometric features that guide the cup to predetermined angular positions. This preliminary configuration of support surfaces allows straightforward angular adjustment without requiring complex adjustment mechanisms during surgery
3Adaptability or versatility
If modular components are used to improve adaptability, then versatility increases, but stability and secure fixation become more difficult to ensure
Solution Approach 1:
The locking mechanism transitions the modular components from a movable state during surgery to a fixed stable state after assembly. The stem support surface and adapter support surface engage at predetermined angles, and the locking mechanism secures this configuration to prevent displacement, ensuring stability while maintaining modular versatility
Solution Approach 2:
The modular design separates the stem and cup components with defined interface surfaces (stem support surface and adapter support surface). These segmented components are designed with complementary geometric features that ensure precise alignment and stable fixation when assembled, with the locking mechanism preventing relative movement between segments
Data Source
AI summary
A humeral component of a shoulder prosthesis encloses a stem module which has a shank and an upper shank portion with a stem support surface. A joint adapter is adapted to hold either a liner or a spherical cap. The joint adapter has an adapter support surface which interfaces with the stem support surface. Further, the stem support surface and the adapter support surface have corresponding radial arc shaped sections which allow positioning of the joint adapter against the stem module at different inclination angles. For fastening the joint adapter to the stem module, a bolt or screw is provided.