Contoured Footwear Insole for Metatarsal Alignment and Comfort
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Solution Overview
Problem
Existing footwear, particularly mass-produced insoles and custom orthotics, struggle to provide proper biomechanical support and alignment under the first metatarsal head, leading to instability and discomfort due to variations in individual foot anatomy.
Innovation Solution
A contoured insole design featuring a raised metatarsal pad with specific slopes on the medial and lateral sides to accommodate varying foot sizes, allowing the first metatarsal to evert and the fifth metatarsal to invert, combined with a modified heel cup to reduce plantar fascia pressure, enhancing flexibility and comfort across multiple shoe sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid insole board is used from heel to metatarsal heads, then structural support is provided, but flexibility and comfort are reduced
Solution Approach 1:
The insole is divided into distinct zones: a rigid heel counter for structural support, a flexible midfoot section, and a raised metatarsal pad area with relief under the first metatarsal head. This segmentation allows different regions to provide different levels of support and flexibility, resolving the contradiction between overall structural integrity and localized flexibility.
Solution Approach 2:
The insole implements local quality by providing rigid support only where needed (heel counter) while maintaining flexibility in other areas (midfoot and metatarsal region). The raised metatarsal pad creates a localized area of reduced support under the first metatarsal head, allowing natural foot movement while maintaining support elsewhere.
2Ease of manufacture
If mass-produced insoles are used, then manufacturing cost is reduced, but proper biomechanical support for individual foot anatomy is compromised
Solution Approach 1:
The insole design incorporates universal features that accommodate a wide range of foot anatomies. The raised metatarsal pad with its specific geometry and the heel counter design provide biomechanical benefits for diverse foot types, allowing a single design to serve multiple functions across different users while maintaining manufacturing efficiency.
Solution Approach 2:
The insole utilizes parameter changes in its geometry, particularly the raised metatarsal pad height and the relief area dimensions, to accommodate variations in foot anatomy. These parameter adjustments allow the mass-produced insole to adapt to individual foot characteristics without requiring custom manufacturing for each user.
3Ease of operation
If the first metatarsal head is supported with reduced support area, then eversion and plantar flexion are encouraged, but stability may be compromised
Solution Approach 1:
The insole employs asymmetric design with the raised metatarsal pad positioned to create uneven support distribution. The pad extends further medially than laterally, and the relief area is strategically positioned to encourage specific foot movements (eversion and plantar flexion) while the asymmetric heel counter provides compensating stability, resolving the contradiction between movement freedom and stability.
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
A trim to fit insole for insertion into a shoe has a raised metatarsal pad on the insole upper surface, wherein the raised metatarsal pad has a first region rising at a slope inboard from a medial edge of the insole board, and configured to underlie the first metatarsal head of the wearer, a second, raised top surface region configured to underlie the second to fourth metatarsal shafts of the wearer, and a third region sloping downward towards the lateral edge of the insole configured to underlie the fifth metatarsal shaft of the wearer, wherein all three regions cooperate to evert the first metatarsal and to invert the fifth metatarsal of the wearer.