Dynamic Footwear Insole with Hydraulic Protrusions
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Solution Overview
Problem
Existing footwear inserts that stimulate cutaneous pressure sensation from the edges of the feet often lead to adaptation and desensitization, causing reduced effectiveness in improving balance over time, and may cause discomfort, which can result in reverse effects on balance and stability.
Innovation Solution
The use of hydraulic forces to automatically raise protrusions on the insole perimeter area through special liquid cells implanted inside the insole, which activate only under increased pressure from the plantar foot surface, providing timely amplification of cutaneous pressure sensation without permanent irritation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If permanent raised ridges are used to stimulate cutaneous pressure sensation, then balance control is improved, but the brain adapts to the signals and desensitization occurs over time
Solution Approach 1:
The insert transforms from static permanent ridges to dynamic protrusions that activate only when needed. The liquid-filled chambers remain dormant during normal walking but protrude when pressure sensors detect COP near the perimeter, providing stimulation only during balance-threatening situations and avoiding continuous adaptation.
Solution Approach 2:
The insert employs periodic/pulsed action by activating protrusions only during specific moments when balance correction is needed, rather than continuous stimulation. This intermittent activation prevents the brain from adapting to constant signals while maintaining balance control effectiveness.
2Reliability
If permanent raised ridges are used to stimulate cutaneous pressure sensation, then balance control is improved, but discomfort and irritation occur leading to reverse effects
Solution Approach 1:
The insert transitions from static permanent ridges that cause continuous discomfort to dynamic protrusions activated only when needed. The soft flexible material and liquid-filled chambers allow the protrusions to emerge gently only during balance correction needs, eliminating constant irritation while maintaining balance control.
3Ease of operation
If thicker insoles are used to provide support, then comfort is improved, but cutaneous sensory feedback is muffled
Solution Approach 1:
The insert introduces pressure sensors and liquid-filled chambers as intermediary elements between the thick insole and the foot. These sensors detect COP position and trigger protrusion activation, bridging the gap between the cushioning insole and the need for cutaneous feedback without requiring thin insole material.
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
This solution enhances somatosensory awareness and stability by mimicking the natural feedback mechanism, reducing the risk of falls and improving balance control in individuals with somatosensory deficits, while avoiding discomfort and long-term desensitization.
Implementation Method 1
The use of hydraulic forces to automatically raise protrusions on the insole perimeter area through special liquid cells implanted inside the insole
Data Source
AI summary
An article of footwear and insert for an article of footwear are provided with means for provisional instantaneous enhancing cutaneous mechanoreceptors pressure sensation from the plantar surface (sole) of the foot perimeter zone.Such instantaneous stimulation ought to compensate age/illness—related deterioration of plantar cutaneous sensation; it enhances its ability to detect and react to the shifts of the body's Center of Gravity (COG) toward the edges of the feet which, if left uncorrected right away, cause ankle sprain, and/or loss of balance and fall.An insole disclosed is provided with a set of pressure-activated protrusions, which form a narrow strip in close proximity to the perimeter of the insole inside the inner neighborhood of the plantar sole perimeter, and becomes active just when the Center Of Pressure (COP) of the wearer of the footwear is shifting dangerously toward the edges of the feet.