Custom Footwear Structure for Dynamic Toe Alignment
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Solution Overview
Problem
Conventional footwear designs fail to accommodate the dynamic range of motion of the phalanges, leading to issues like hallux valgus due to the static structure forcing inelastic bones into mal-orientation, neglecting the mathematics of ligamental mal-orientation.
Innovation Solution
Footwear designs that allow for lateral and medial articulation and expansion of all five toes, incorporating features like flared forefoot portions, spherical protrusions, and toe separators, utilizing 3D printing for customization and lattice structures to support natural toe alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional footwear uses a static, pill-shaped sole structure to accommodate the tarsal and metatarsal bones, then the footwear provides structural support and stability, but it causes mal-orientation of the phalanges and leads to hallux valgus due to the dynamic range of motion of the toes
Solution Approach 1:
The footwear transitions from a static sole structure to a dynamic one that allows the forefoot portion to expand and articulate laterally and medially. This enables the shoe to adapt to the dynamic range of motion of the phalanges during walking and balancing, preventing mal-orientation while maintaining structural support through controlled flexibility.
Solution Approach 2:
The footwear is divided into distinct functional zones: a stable hindfoot portion and a dynamic forefoot portion with independent articulation capabilities. This segmentation allows the heel area to provide structural support while the toe area accommodates the dynamic motion of the phalanges, resolving the contradiction between stability and flexibility.
2Shape
If footwear applies external forcing function to correct toe alignment, then toe orientation may be improved, but it requires substantial external intervention and complex mechanisms
Solution Approach 1:
The footwear enables the body's own tendons and muscles to act as internal forcing functions that naturally realign the phalanges. By providing the appropriate dynamic environment with lateral and medial articulation, the shoe allows the physiological structures to self-correct the alignment without requiring complex external mechanical intervention.
Solution Approach 2:
The invention replaces complex external mechanical forcing systems with the body's own physiological mechanisms. Instead of using motors, actuators, or complex linkages to force toe alignment, the footwear utilizes the natural tension and contraction of tendons and muscles to achieve correction, significantly simplifying the system.
3Ease of manufacture
If footwear uses a standardized sole shape for mass production, then manufacturing cost and complexity are reduced, but it cannot accommodate individual variations in foot anatomy and toe dynamics
Solution Approach 1:
The footwear utilizes 3D printing technology to vary geometric parameters such as forefoot expansion angle, articulation point location, and lattice structure density based on individual foot scans. This allows each shoe to be customized to the patient's specific anatomy while still using automated manufacturing processes, bridging the gap between standardized production and personalized fit.
Solution Approach 2:
The manufacturing process incorporates preliminary scanning and modeling of the patient's foot anatomy before production. This preliminary action captures individual variations in foot structure and toe dynamics, allowing the 3D printing process to pre-calculate the optimal sole geometry and articulation characteristics for each individual case.
Data Source
AI summary
A method for forming a custom footwear article based on a characteristic scan of a human foot.