Segmented Shoe Sole with Pre-Stretched Grooves for Natural Gait
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Solution Overview
Problem
Conventional shoes exacerbate forefoot varus and over pronation issues by restricting forefoot extension and eversion, leading to poor foot positioning, instability, and increased susceptibility to injuries such as plantar fasciitis and ACL injuries.
Innovation Solution
A modified shoe design featuring a sole with independent flexible and movable heel, midfoot, forefoot, and toe box portions, and deep pre-stretched flex grooves, allowing for natural foot movements and proper gait patterns by enabling forefoot extension and eversion, and distributing weight across the heel, lateral midfoot, and forefoot.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional shoes are designed with a rigid sole structure, then manufacturing precision and structural stability are improved, but forefoot extension and eversion are restricted, leading to poor foot positioning and increased injury risk
Solution Approach 1:
The sole is divided into multiple independent sections: heel portion, midfoot portion, forefoot portion, and toe box portion. Each section can move independently, allowing the forefoot to extend and evert naturally while maintaining overall structural stability. The connection sections between portions use elastic compressible material to enable this segmented movement.
Solution Approach 2:
The sole transitions from a rigid static structure to a dynamic structure where each portion can move relative to others during gait. The pre-stretched flexible grooves and elastic connection sections allow the sole to adapt its shape and flexibility based on the foot's natural movements during walking or running.
2Adaptability or versatility
If the sole is made completely flexible to allow natural foot movement, then forefoot extension and eversion are improved, but structural stability and weight distribution are compromised
Solution Approach 1:
By segmenting the sole into distinct portions connected by elastic materials, the design achieves both flexibility for movement and stability for weight distribution. Each portion maintains its structural integrity while allowing controlled movement relative to adjacent portions.
Solution Approach 2:
Different portions of the sole have different properties: the heel portion provides stable weight bearing, the midfoot portion allows controlled movement through connection sections, and the forefoot portion enables natural extension and eversion. Each area is optimized for its specific function while contributing to overall stability.
3Adaptability or versatility
If deep pre-stretched flexible grooves are added to the sole, then forefoot extension during push-off is improved, but device complexity increases
Solution Approach 1:
The deep pre-stretched flexible grooves create curved, rounded bottom sections in the forefoot portion. These rounded contours naturally guide the forefoot through extension and eversion movements during push-off, eliminating the need for complex mechanical joints or articulations.
Solution Approach 2:
The flexible grooves are formed directly into the sole material itself, creating a flexible shell structure that bends and deforms naturally during foot movement. This avoids the need for separate flexible components or complex assemblies, maintaining relatively simple device construction.
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 modified shoe promotes a natural gait pattern, reduces the risk of injuries associated with forefoot varus and over pronation, and enhances foot muscle training by allowing the foot to land and push off in a more neutral and stable position.
Implementation Method 1
each connection section is composed of an elastic compressible material
Implementation Method 2
each connection section further comprises a pre-stretched flexible groove
Data Source
AI summary
A modified shoe that allows the forefoot to extend, creating an everted forefoot in relation to an inverted heel. This action of the foot creates a higher and contracted medial arch. The force of the first metatarsophalangeal joint and first phalange pushing against the ground tilts the rest of the foot at a slight angle to the lateral side, creating supination. The modified shoe also incorporates a unique process of pre-stretching forefoot flex grooves that will allow for a more efficient hinge at the metatarsophalangeal joints. This allows for the several biomechanical changes to a person's gait pattern. This shoe will allow for people to walk with a more natural gait pattern, and not the gait pattern that many people have adopted due to restrictive footwear. This shoe will be ideal for people with forefoot varus, and will have benefits for people with a neutral foot as well.