Monolithic Flexure Support Mechanism for Wear-Free Disc Motion
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Solution Overview
Problem
Existing compliant support mechanisms, particularly in medical devices like artificial disc replacements, suffer from complications such as implant migration, subsidence, and wear due to their multi-part designs and mechanical properties differing from natural intervertebral discs, leading to further spinal complications.
Innovation Solution
A novel compliant support mechanism using additive manufacturing to create a monolithic structure with compliant flexure prongs, customizable and optimized through computational modeling and machine learning, mimicking natural disc motion and function, with no articulating joints, and featuring variable flexure prongs for enhanced support, damping, and controlled motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multi-part designs are used in compliant support mechanisms, then ease of manufacture is improved, but reliability deteriorates due to implant migration, subsidence, and wear
Solution Approach 1:
The patent merges multiple separate components into a single monolithic structure manufactured via additive manufacturing. The compliant support mechanism integrates the support body, flexure elements, and attachment features into one continuous piece, eliminating interfaces between parts that would otherwise be prone to wear, migration, and subsidence. This resolving the contradiction by prioritizing reliability through integration while maintaining manufacturability through advanced manufacturing processes.
2Strength
If mechanical properties are made different from natural intervertebral discs, then structural support is improved, but harmful factors increase due to further spinal complications
Solution Approach 1:
The patent applies local quality by creating regions of different mechanical properties within the monolithic structure. The flexure elements have controlled compliance in specific directions to provide motion, while other regions maintain higher stiffness for structural support. This localized differentiation allows the implant to mimic natural disc behavior in critical areas while providing enhanced structural support where needed, reducing harmful effects on surrounding spinal structures.
Solution Approach 2:
The patent utilizes parameter changes by varying the geometric parameters of the flexure elements during additive manufacturing. By adjusting wall thickness, curvature, and cross-sectional dimensions in different regions, the mechanism achieves tailored compliance characteristics. This allows optimization of mechanical properties to balance structural support with motion control, preventing harmful spinal complications while maintaining necessary strength.
3Reliability
If monolithic structure with compliant flexure prongs is used, then reliability is improved by minimizing wear, but device complexity increases
Solution Approach 1:
The patent replaces traditional mechanical joint systems with compliant flexure prongs that provide motion through elastic deformation rather than articulating surfaces. This substitution eliminates wear between moving parts while maintaining the necessary degrees of freedom. The complexity is managed through additive manufacturing, which can efficiently produce the complex monolithic geometry without requiring complex assembly processes.
Solution Approach 2:
The patent applies segmentation by dividing the monolithic structure into functional zones: rigid support regions for structural integrity and compliant flexure regions for controlled motion. The flexure prongs are segmented into multiple bending zones with varying compliance characteristics. This functional segmentation allows the device to achieve reliable wear-free operation while managing complexity through clear functional differentiation within the monolithic structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides improved motion and function while minimizing wear, offering customizable and durable implantable devices for intervertebral disc replacements, reducing the risk of complications and enhancing long-term performance.
Implementation Method 1
compliant flexure prongs...provide support, damping, and/or a controlled range of motion
Implementation Method 2
the compliant flexure prongs have a variable structure including one or more bends, curves, or twists
Data Source
AI summary
There is disclosed a compliant support mechanism including a first support surface; a second support surface; and one or more flexure prongs arranged in a configuration therebetween, each flexure prong having a plurality of bends or curves along its length so as to allow the configuration of one or more flexure prongs to be resiliently compliant when subjected to external forces on the support surfaces. The one or more flexure prongs have a compliance profile dependent upon the application.