Contoured Insole with Gel and Polyurethane Zones
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Solution Overview
Problem
Existing over-the-counter shoe insoles either prioritize cushioning and fail to provide adequate support during strenuous activities or focus on control, leading to potential foot injuries due to abrupt load changes, and they are not practical for widespread use without individualized fitting or adjustment.
Innovation Solution
A shoe insole design featuring a base layer, a forefoot pad made of clear TPR gel, and a midfoot-to-heel support cushion of soft polyurethane, with a separation wall and additional features like diamond-shaped groove patterns and a heel dome, providing both enhanced cushioning and control while preventing pronation and supination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cushioning insole is used to maximize shock absorption, then cushioning performance is improved, but support and control during strenuous activities deteriorates
Solution Approach 1:
The insole is divided into multiple functional zones with different material properties: a firmer central zone for support and control, and softer peripheral zones for cushioning. This segmentation allows the insole to simultaneously provide both cushioning and support during strenuous activities without bottoming out.
Solution Approach 2:
Different regions of the insole have locally optimized material characteristics - the central load-bearing areas use firmer materials for support, while edge and heel areas use softer materials for cushioning. This local quality differentiation resolves the contradiction between needing firm support and soft cushioning in different locations.
2Strength
If a rigid insole structure is used to control foot motion, then control performance is improved, but forgiveness and injury prevention deteriorates
Solution Approach 1:
The insole transitions from static rigid structures to dynamic materials that adapt their properties during use. The viscoelastic and shear-thickening materials provide firm control when needed but become more compliant under rapid loading, preventing abrupt load changes and reducing injury risk.
Solution Approach 2:
The insole materials change their mechanical parameters in response to applied stress - remaining soft during normal movement for comfort, then becoming stiffer under high impact loads for protection. This parameter change allows the insole to provide both control and forgiveness depending on the loading conditions.
3Reliability
If custom made insoles are produced to address individual needs, then fit and performance are improved, but manufacturing cost and accessibility deteriorates
Solution Approach 1:
The insole design uses universal anatomical zones that accommodate the majority of foot types and activity requirements. By incorporating multiple functional materials in standardized configurations, the insole achieves near-custom performance for a broad population without requiring individualized manufacturing processes.
Solution Approach 2:
The insole combines multiple materials with different properties (viscoelastic foam, shear-thickening fluid, gel) in a composite structure that provides comprehensive support and cushioning. This composite approach allows a single mass-produced insole to deliver the complex performance previously requiring custom multi-material 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 insole offers improved ankle and foot stability, enhanced cushioning, and controlled motion, making it suitable for various activities without the need for individualized fitting, while minimizing movement and providing balanced biomechanical support.
Implementation Method 1
a forefoot pad made of a clear TPR gel... providing enhanced cushioning
Implementation Method 2
The many bones, muscles, ligaments, and tendons of the foot function to absorb and dissipate the forces of impact
Implementation Method 3
a midfoot-to-heel support cushion made of a soft polyurethane
Implementation Method 4
The forefoot pad has a diamond shaped groove pattern on its bottom surface to improve forefoot cushioning characteristics, and improve traction and adhesion of the insole inside and along the interior bottom surface of the user's shoe
Implementation Method 5
curving up in the medial arch area to form an arch support area... providing controlled motion... preventing pronation and supination
Implementation Method 6
curving around the heel area to form a heel cup... providing improved ankle and foot stability
Data Source
AI summary
An insole having a top sheet and a base layer with three pieces that include a base layer, a forefoot pad made of a clear TPR gel and a mid-foot to heel cushion made of a supersoft polyurethane. The midfoot/heel surface has a raised arch with criss-crossing longitudinal curvilinear indentations, a flattened midfoot area with a metatarsal midfoot tear-drop raised area, and a heel cup that surrounds the exterior back of the heel. A heel pod opening goes through the entirety of the thickness of base layer of the insole body and a heel pad is affixed to the bottom surface of the base layer being made of a clear TPR gel or blown EVA. There is also a supersoft heel dome and a metatarsal raised dome on the top (foot contact) surface of the insole which would be directly above the heel pod and the metatarsal midfoot area, respectively.