Non-Water Activated Cast with Breathable Composite Layers
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Solution Overview
Problem
Existing casts for lower extremities are inefficient, time-consuming to apply, and may not provide optimal biomechanical support, particularly for diabetic foot conditions, due to issues with breathability, weight, stiffness, and the need for water activation.
Innovation Solution
A cast system comprising at least two layers of sheet-like material, with a water-resistant and breathable inner layer and a semi-rigid, non-water-activated outer layer, designed to enclose the lower extremity and provide controlled ankle movement and weight-bearing capabilities without the need for water activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If water-activated cast materials (plaster, fiberglass) are used, then the cast can provide structural support and immobilization, but the application process becomes time-consuming and requires water activation procedures
Solution Approach 1:
The cast material is pre-formed into a rigid structure with predetermined anatomical contours before application. The material is pre-cut and pre-shaped to fit the lower extremity, eliminating the need for time-consuming wrapping and molding procedures during application.
Solution Approach 2:
The patent employs a disposable, single-use cast system that is pre-fabricated and discarded after use. This eliminates the need for complex activation procedures and allows for rapid application and removal without requiring water activation or setting time.
2Stability of the object's composition
If traditional cast materials are used, then the cast provides immobilization, but the cast lacks breathability and causes discomfort for diabetic foot conditions
Solution Approach 1:
The cast is constructed from composite materials that combine rigid structural components for immobilization with breathable, moisture-wicking layers in contact with the skin. This multi-material construction provides both structural support and breathability, addressing the needs of diabetic foot patients.
Solution Approach 2:
Different regions of the cast have different properties: the inner layer contacting the skin is made breathable and moisture-absorbent, while the outer structural layers provide rigidity and immobilization. This local differentiation of material properties allows the cast to simultaneously provide immobilization and breathability.
3Shape
If water-activated cast materials are used, then the cast can be molded to fit, but the material becomes excessively stiff and resists molding
Solution Approach 1:
The cast is pre-formed into its final shape during manufacturing with precise anatomical contours. This preliminary shaping eliminates the need for现场 molding and eliminates the contradiction between moldability and stiffness, as the cast arrives ready-to-apply in its final configured state.
4Ease of operation
If fiberglass mesh sleeves are used, then the cast can be stretched and placed over the extremity, but the cast lacks sufficient rigidity for weight-bearing and immobilization
Solution Approach 1:
The cast is pre-formed and pre-configured before application, eliminating the need for stretching and molding during application. The rigid structure is designed to be applied as a complete unit, providing both ease of application and sufficient rigidity for weight-bearing.
Solution Approach 2:
The cast combines rigid structural materials with flexible interface layers that facilitate easy application. The composite construction allows the outer structure to remain rigid for immobilization while the inner layers provide ease of application and comfort.
Data Source
AI summary
A non-water-activatable cast has one or more layers of sheet-like material which create a combined flexibility, stiffness, or rigidity so that the cast may be manually positioned in substantial contact with a lower extremity to be received within the cast. As such, the cast is not only readily deployable by a patient, but has predetermined flexibility located and selected to control ankle movement within a therapeutically appropriate range, whether used by itself or in association with a related orthosis, such as a CAM walker. In certain applications, the cast likewise offloads or otherwise redistributes force by virtue of the rigidity of the plantar impact surface on such cast and the rigidity of other cast portions.