Heel Off-Loading Boot Structure for Foot Drop Prevention
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Solution Overview
Problem
Existing devices for preventing or curing heel sores in bed patients are ineffective in reducing pressure and friction, often become disengaged, create additional pressure points, and fail to allow for the use of medical tubing like sequential compression pumps, leading to inadequate blood flow and increased risk of decubitus ulcers.
Innovation Solution
A medical boot featuring a combination of angled foam and fiber fill, with sewn holes for medical tubing, moisture-absorbing interior fabric, and moisture-repelling exterior fabric, along with secure strapping and a T-bar stabilizer to prevent internal rotation, ensuring effective heel elevation and air circulation while preventing foot drop and bacterial growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If foam cushioning is used to relieve heel pressure, then pressure reduction is achieved, but additional pressure points are created on the patient's leg
Solution Approach 1:
The boot combines foam cushioning material with fiber filling material to create a composite structure. The foam provides pressure relief while the fiber filling distributes pressure evenly, preventing the formation of additional pressure points on the patient's leg.
2Stress or pressure
If fiber filling is used to provide cushioning, then some cushioning is achieved, but the heel cannot be sufficiently elevated
Solution Approach 1:
The boot integrates foam cushioning material with fiber filling material in a layered composite structure. The foam layer provides elevation and structural support for the heel, while the fiber filling layer provides additional cushioning and comfort, achieving both heel elevation and cushioning simultaneously.
3Stress or pressure
If prior art devices are used to reduce heel pressure, then pressure reduction is achieved, but they do not off-load pressure from the heel
Solution Approach 1:
The boot is designed with a segmented structure featuring a heel cutout that separates the heel area from the cushioning material. This segmentation allows the heel to be completely off-loaded from pressure contact points while maintaining support for the surrounding leg areas.
4Ease of manufacture
If devices are designed from untreated foam alone, then manufacturing is simple, but bacteria can harbor inside the boot
Solution Approach 1:
The boot uses a composite structure combining foam material with fiber filling material. The fiber filling material has natural antibacterial properties that prevent bacterial growth inside the boot, while the foam provides structural support. This composite approach maintains manufacturing feasibility while eliminating the bacterial harboring problem of untreated foam alone.
5Stress or pressure
If foam cushioning is used to support the heel, then pressure relief is achieved, but foot contracture and decreased blood flow occur
Solution Approach 1:
The boot features a heel cutout that segments the support structure from the heel area. This allows the heel to be completely off-loaded from pressure contact points while maintaining support for the surrounding leg areas, preventing foot contracture and improving 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 boot effectively reduces pressure and friction, enhances blood flow, allows for simultaneous use of medical tubing, and prevents bacterial growth, thereby reducing the risk of heel sores and associated joint problems, while being easy to use and maintain.
Implementation Method 1
The boot effectively reduces pressure and friction
Implementation Method 2
moisture-absorbing interior fabric
Implementation Method 3
moisture-repelling exterior fabric
Implementation Method 4
enhances blood flow, allows for simultaneous use of medical tubing
Data Source
AI summary
A heel supporting and protective boot for bed-ridden patients, comprising unitary exterior and interior body forms which contain fiber filling and an angled foam wedge. Sewn tube holes on both sides allow for insertion of medical tubing. The inner fabric of the boot is antibacterial and moisture absorbent, while the outer fabric is moisture repellant. Left and right “Y-straps” provide secure upper and lower fastening of the boot as it envelops the patient's foot and lower leg. Two “loop” straps and a T-stabilizer stabilize the boot and keep the foot at a 90 degree angle to help eliminate foot drop. An opening at the heel of the boot and a circular cutout in the foam wedge allow the heel to remain exposed to air, provide proper elevation, and enhance blood circulation. The device enhances the healing of existing ulcers and minimizes the occurrence of foot drop and new pressure points.