Modular Offset Stem Implants with Rotatable Intermediate Components
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Solution Overview
Problem
Current modular stem implants lack sufficient anatomical flexibility to accommodate varying patient anatomies, particularly in addressing mismatches between the intramedullary canal and the center of the proximal tibia.
Innovation Solution
A modular device with rotatably interconnectable intermediate components that allow for selective adjustment of the total offset between the stem and the end component, utilizing Morse taper or taper lock connections for eccentric coupling, enabling multiple relative offsets and orientations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing modular implants are used, then the implant can be installed, but anatomical flexibility is insufficient to accommodate varying patient anatomies
Solution Approach 1:
The implant is divided into multiple modular components including a stem, end component, and one or more intermediate components. Each intermediate component can be independently selected and combined, allowing the overall offset and orientation to be customized for different patient anatomies while maintaining manageable complexity through standardized interfaces
Solution Approach 2:
The intermediate components are designed with rotational capability, allowing the offset between the stem and end component to be dynamically adjusted by rotating the intermediate component to different angular positions. This enables flexible adaptation to various anatomical configurations without requiring multiple fixed-offset implant designs
2Adaptability or versatility
If a fixed offset implant is used, then the implant structure is simple, but it cannot address mismatches between the intramedullary canal and the center of the proximal tibia
Solution Approach 1:
One or more intermediate components are introduced as mediator elements between the stem and end component. These intermediates provide the offset adjustment functionality, allowing the stem axis and end component center to be positioned at various offsets while the intermediate component absorbs the complexity of the modular connection and rotational adjustment mechanism
Data Source
AI summary
A modular device for coupling a stem to an end component of an implant. The device includes a plurality of rotatably interconnectable intermediate components for coupling the stem to the end component, such that each intermediate component can be rotated for selectively changing a total offset between the stem and the end component by a relative offset.