Orthopedic Walker Outsole Structure for Natural Rollover Gait
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Solution Overview
Problem
Conventional orthopedic walkers with linear outsoles disrupt the natural gait of users, causing discomfort, stress, and biomechanical issues due to mismatch with the user's natural rollover motion, and are costly with complex manufacturing processes.
Innovation Solution
An orthopedic walker with an overmolded outsole integrated to the base, featuring a reduced heel thickness and tapered lattice structure, eliminating the need for adhesives, and incorporating molded slots for straps, which reduces material complexity and weight while enhancing the natural rollover motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a linear outsole design is used, then the manufacturing process is simple, but it disrupts the natural gait and causes discomfort and biomechanical issues
Solution Approach 1:
The outsole is designed with a curved rollover profile that follows the natural arc of foot motion during walking. The curved geometry allows the heel to transition smoothly to the toe, enabling the foot to roll forward naturally during the gait cycle without forcing the foot into an unnatural straight-line motion pattern
Solution Approach 2:
The outsole parameters are optimized to match anatomical foot dimensions and natural gait mechanics. The curved rollover profile, heel height, and toe geometry are specifically dimensioned to replicate the natural foot's motion arc and contact sequence with the ground during walking
2Ease of manufacture
If conventional adhesive bonding is used to attach the outsole, then the attachment method is simple, but it increases manufacturing cost and complexity
Solution Approach 1:
The outsole and base are merged into a single integrated component through overmolding. The outsole material is molded directly over the base structure in one continuous manufacturing operation, eliminating the need for separate attachment steps and adhesive materials
Solution Approach 2:
The walker combines a structural plastic base with a thermoplastic elastomer outsole in a composite construction. The overmolding process creates a durable bond between these two different materials, with the elastomer outsole providing both structural integration and enhanced comfort properties
3Strength
If a thick heel design is used, then the structural support is robust, but it creates pressure points and discomfort on the user's foot
Solution Approach 1:
The heel area features a reduced thickness design that provides adequate structural support while minimizing contact pressure on the user's heel. The localized thinning of the heel portion maintains necessary strength for load-bearing while improving comfort during weight-bearing activities
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 integrated design provides a more comfortable and natural gait, reduces user stress, and lowers manufacturing costs by simplifying the structure and eliminating the need for separate fastening components.
Implementation Method 1
an overmolding process, wherein a plastic outsole is molded directly onto the base without adhesive, with the outsole material flowing into holes in the base to create mechanical interlocks
Data Source
Figure 1A
Figure 1
Figure 2~3A
AI summary
An orthopedic walker (100) includes an outsole (102) and a base (104). The outsole is formed from a thermoplastic elastomer and has protrusions or recesses interlocking corresponding protrusions or recesses of the base. The outsole is securely attached in place to the base due to a shrink-fit about at least a portion of the base and without adhesive.