Dual-Layer Insole with Fluid Cavities for Diabetic Foot Ulcer Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current footwear designs for diabetic patients are inadequate in preventing foot ulcers, as they often only address peak pressure or shear stress without effectively managing cyclic mechanical loading, leading to partial or marginal success in ulcer prevention.
Innovation Solution
The development of dual-layer insole apparatuses that modulate and redistribute pressure and shear stresses on the plantar surface of the foot through a fluid source system, incorporating cavities that can vary internal pressures to reduce prolonged mechanical loading and enhance blood perfusion, integrated with sensors and a control unit to adjust pressure dynamically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current footwear designs address only peak pressure or shear stress, then device complexity is reduced, but ulcer prevention effectiveness is insufficient
Solution Approach 1:
The insole is divided into multiple independent cavities (first cavity under metatarsal head, second cavity under heel, third cavity under another metatarsal head) that can be controlled separately. Each cavity can be independently inflated or deflated to provide targeted pressure relief to specific high-risk areas, allowing the system to address multiple stress factors simultaneously without requiring a completely new device design
Solution Approach 2:
The control unit alternates between inflating and deflating the cavities in a periodic cycle. During the diabetic patient's walking cycle, the system inflates cavities during stance phase to reduce peak pressure, then deflates them during swing phase. This periodic action allows the same physical structure to dynamically adapt to changing mechanical loads, providing comprehensive protection against both peak pressure and prolonged loading without requiring multiple separate devices
2Reliability
If a fluid source system with multiple cavities is used to modulate pressure, then cyclic mechanical loading management is improved, but device complexity increases
Solution Approach 1:
The fluid source and control unit serve multiple functions: they control pressure in all cavities, monitor pressure through sensors, adjust inflation/deflation timing based on gait phase, and adapt to different walking speeds. This multi-functionality allows a single integrated system to manage cyclic mechanical loading across multiple foot regions without requiring separate control mechanisms for each cavity
Solution Approach 2:
Pressure sensors are integrated into each cavity to provide real-time feedback to the control unit about the current pressure state. The control unit uses this feedback to automatically adjust the inflation and deflation timing and pressure levels, ensuring optimal pressure management during different phases of the walking cycle. This closed-loop feedback system enables the device to adapt to varying gait patterns without requiring complex manual adjustment mechanisms
3Reliability
If pressure is increased in cavities to reduce prolonged loading, then blood perfusion is enhanced, but peak pressure reduction may be compromised
Solution Approach 1:
The system employs periodic inflation and deflation of cavities synchronized with the gait cycle. During the stance phase when peak pressure occurs, cavities are inflated to provide immediate pressure relief. During the swing phase or periods of reduced loading, cavities are deflated or maintained at lower pressure to allow tissue deformation that promotes blood perfusion. This temporal separation of pressure relief and perfusion promotion functions resolves the contradiction between reducing peak pressure and enhancing blood flow
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 apparatus effectively reduces the risk of diabetic foot ulcers and metatarsal stress fractures by automatically altering gait patterns and facilitating blood perfusion, while also aiding in pain relief for individuals with rheumatoid arthritis and accelerating wound healing.
Implementation Method 1
a body (18) defining a plurality of cavities (22) configured to be coupled to a fluid source (102) such that the fluid source can deliver fluid to vary internal pressures of the cavities (22)
Data Source
AI summary
Dual-layer insole apparatuses for diabetic foot lesion prevention and related methods are provided. Some insole apparatuses have a body defining a plurality of cavities configured to be coupled to a fluid source. The fluid source can deliver fluid to vary internal pressures of the cavities. The body further defines an insole-shaped structure.