Cast Protector Flexible Sleeve Sealing
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Solution Overview
Problem
Existing cast protectors face challenges in providing a waterproof seal without a semi-rigid sealing ring, which increases manufacturing costs and complicates packaging, and they often tear when stretched over varying cast diameters, especially at joints like elbows and knees.
Innovation Solution
A flexible waterproof sleeve with a stretchable diaphragm and a 'released radius cut' at the corner, eliminating the need for a separate sealing ring, allowing for easy application and sealing without tearing, and enabling compact packaging by folding over itself.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a semi-rigid sealing ring is used to provide a waterproof seal, then the sealing effectiveness is improved, but the manufacturing cost increases and packaging becomes bulky
Solution Approach 1:
The patent removes the separate semi-rigid sealing ring component entirely, extracting it from the cast protector system. Instead, the waterproof seal is achieved through the flexible tubular material itself forming a self-contained seal with the diaphragm, eliminating the need for additional sealing ring components and reducing manufacturing complexity and packaging volume.
Solution Approach 2:
The patent merges the sealing function into the flexible tubular material and diaphragm assembly itself. The tubular material and diaphragm work together as an integrated sealing system rather than requiring a separate sealing ring, combining multiple functions into a single unified structure that reduces part count and packaging requirements.
2Adaptability or versatility
If the diaphragm is made highly stretchable to accommodate various cast diameters, then the adaptability is improved, but the risk of tearing at the sealing point increases
Solution Approach 1:
The patent applies different properties to different parts of the diaphragm structure. The diaphragm is designed with a reinforced sealing area where it attaches to the tubular material, providing local strength enhancement at the critical sealing point while maintaining overall stretchability in other areas to accommodate various cast diameters.
Solution Approach 2:
The diaphragm is constructed as a composite structure combining stretchable material with reinforcing elements at the sealing interface. This composite construction allows the diaphragm to stretch adequately for different cast sizes while the reinforcing components prevent tearing at the attachment point to the tubular material.
3Ease of operation
If the cast protector is made flexible to allow movement and easy application, then the ease of operation is improved, but the waterproof integrity may be compromised
Solution Approach 1:
The patent employs a flexible tubular material as the primary structure of the cast protector. This flexible material forms a conforming sleeve that can accommodate joint movements and easy application while maintaining waterproof integrity through proper sealing design at the diaphragm attachment points, allowing the protector to be both flexible and reliable.
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 solution provides a cost-effective, waterproof seal that accommodates various cast sizes and shapes, including 90° bends, while maintaining integrity and ease of use, reducing manufacturing expenses and improving packaging efficiency.
Implementation Method 1
the diaphragm must be more stretchable, than the flexible cast cover. Such a difference in stretch properties often results in a tear at the point of sealing of the diaphragm and cast cover
Implementation Method 2
Adjacent laterally to the open end 16 are two tab areas 18 and 20 which can be pulled conveniently by grasping with the hand in order to pull the cast protector on over a limb
Data Source
AI summary
Cast and bandage protector that avoids use of a separate sealing ring and therefore can be folded over upon itself, has suitability for convenient packaging and at the same time still provides an effective waterproof sealing arrangement.