Orthopedic Walker Outsole for Natural Rollover and Simple Assembly
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Solution Overview
Problem
Conventional orthopedic walkers with linear outsoles impose stress and discomfort by resisting the natural gait of the wearer, leading to biomechanical compensations and long-term issues such as bad posture, foot abnormalities, and muscle imbalances, while also being costly and complex to manufacture.
Innovation Solution
An orthopedic walker with a reduced heel thickness and an overmolded outsole integrated with a base, featuring a lattice structure and molded slots for straps, which facilitates a natural rollover motion and simplifies manufacturing by eliminating adhesives and D-rings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a linear outsole design is used, then manufacturing is simplified, but it resists the natural gait of users causing discomfort and biomechanical problems
Solution Approach 1:
The outsole is designed with a curved profile that follows the natural rollover motion of the foot from heel strike through toe-off. This curvature allows the outsole to rock forward naturally during walking, facilitating external rotation and preventing the resistance to natural gait that occurs with linear designs.
2Strength
If conventional outsole thickness is used, then structural strength is maintained, but it creates awkward pressure points and conflicts with natural rollover motion
Solution Approach 1:
The outsole features variable thickness with a reduced heel thickness of approximately 0.5 to 1.5 inches, compared to conventional thicker designs. This localized thinning at the heel allows the outsole to more closely match the heel height of an unimpaired foot and facilitates natural rollover motion, while maintaining adequate strength through strategic reinforcement in other areas.
3Reliability
If separate D-ring components and adhesives are used, then outsole attachment is achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
The outsole is integrally molded to the base structure as a single piece, eliminating the need for separate D-ring components and adhesive bonding. This unified construction reduces the number of parts, simplifies manufacturing, and eliminates potential failure points associated with separate attachment methods while maintaining secure attachment.
Data Source
AI summary
An orthopedic walker includes an outsole and a base. 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.