Segmented Shell and Everted Sleeve for Post-Amputation Residuum Protection
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Solution Overview
Problem
Existing post-amputation residuum protection devices struggle to effectively accommodate volume fluctuations due to edema, leading to instability and inadequate protection.
Innovation Solution
A shell with circumferentially spaced longitudinal slits and a compression sleeve that can expand or contract to fit the varying volume of the residuum, with the sleeve everted to compress the shell inwardly for secure positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid shell is used to protect the residuum, then protection strength is improved, but adaptability to volume fluctuations deteriorates
Solution Approach 1:
The shell is divided into multiple circumferential segments separated by longitudinal slits. These segments can move relative to each other, allowing the shell to expand or contract in circumference while maintaining structural integrity and protection strength.
Solution Approach 2:
The shell incorporates flexible elements including longitudinal slits and circumferential hinges that enable the rigid-appearing structure to flex and adapt to volume changes in the residuum while maintaining its protective function.
2Adaptability or versatility
If a compression sleeve is added to accommodate volume fluctuations, then adaptability is improved, but device complexity increases
Solution Approach 1:
The compression sleeve is integrated with the shell structure through the eversion mechanism, where the sleeve's distal end passes through the shell and everts to become part of the compression system. This merging reduces the need for separate fastening mechanisms and simplifies the overall device.
Solution Approach 2:
The compression sleeve utilizes the user's own hand to apply compression by everting the sleeve over the residuum. This self-service mechanism eliminates the need for additional compression devices or complex adjustment mechanisms.
3Adaptability or versatility
If the shell is made flexible with slits to accommodate volume changes, then adaptability is improved, but structural stability deteriorates
Solution Approach 1:
The shell is segmented into multiple sections by longitudinal slits, allowing controlled flexibility while maintaining overall structural integrity. The segments can move independently to accommodate volume changes without compromising the stability of the entire structure.
Solution Approach 2:
The shell combines rigid and flexible elements, including the use of flexible materials for the sleeve and hinge regions while maintaining rigid protective sections, creating a composite structure that balances stability and adaptability.
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 flexible and secure fit that accommodates volume changes, ensuring consistent protection and comfort for post-amputation residua, regardless of edema fluctuations.
Implementation Method 1
a first plurality of circumferentially spaced longitudinal slits extending from the proximal end partially toward the distal end, and a second plurality of circumferentially spaced longitudinal slits extending from the distal end opening partially toward the proximal end for allowing the shell to expand or contract
Implementation Method 2
The sleeve everts upon application of a longitudinal force to the distal portion of the sleeve in a proximal direction for folding over and covering the shell
Implementation Method 3
The distal portion of the everted sleeve extends proximally of the shell to a position at least partially along the proximal portion of the sleeve for compressing the shell inwardly toward the residuum
Data Source
AI summary
An apparatus for protecting a post-amputation residuum comprises a shell defining a hollow interior cavity adapted for receiving and covering a distal portion of the residuum. The shell has an opening into the cavity at the distal end. A first and a second plurality of circumferentially spaced longitudinal slits extend from the proximal end and the distal end, respectively. A proximal portion of a compression sleeve is disposed over at least a portion of the residuum. A free distal portion of the sleeve extends through the opening in the shell and everts upon application of a longitudinal force to the distal portion of the sleeve in a proximal direction for folding over and covering the shell. The distal portion of the sleeve extends proximally of the shell to a position at least partially along the proximal portion of the sleeve for compressing the shell inwardly toward the residuum.