Shape Memory Alloy Wire Compression Garment
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Solution Overview
Problem
Traditional compression appliances provide uneven compression forces across the body, leading to inadequate support and recovery for muscles, and are often uncomfortable and bulky, which can reduce compliance with treatment regimens and increase the risk of conditions like deep vein thrombosis.
Innovation Solution
A wearable compression appliance featuring a single shape memory alloy wire embedded in a wrap portion, with a looped arrangement that provides consistent compression through two zones with varying wire segment spacing, allowing for actuation to constrict and expand, mimicking multiple wires while reducing power consumption and hardware volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If traditional compression appliances use multiple wires or plastic wrapping, then compression force can be applied, but the device becomes bulky and uncomfortable
Solution Approach 1:
The patent combines multiple wire functions into a single shape memory alloy wire that performs both structural support and compression actuation. The SMA wire is embedded within a compression garment to replace traditional multiple-wire systems, reducing hardware volume while maintaining compression capability through the wire's unique shape memory properties
Solution Approach 2:
The patent utilizes parameter changes in the shape memory alloy wire's physical state (phase transformation between austenite and martensite) to achieve compression. By changing temperature or applied voltage, the wire transforms between extended and contracted states, providing dynamic compression control without bulky mechanical components
2Ease of manufacture
If traditional compression appliances use uniform wire spacing, then manufacturing is simple, but compression precision varies across body parts
Solution Approach 1:
The patent implements local quality by varying the spacing of the shape memory alloy wire along its length to match the anatomical requirements of different body parts. The wire is positioned with closer spacing in regions requiring higher compression (such as distal extremities) and wider spacing in regions requiring lower compression, optimizing recovery effectiveness for each specific body zone
3Force
If compression appliances provide high compression force, then recovery benefits increase, but comfort decreases and compliance reduces
Solution Approach 1:
The patent implements dynamic compression through the shape memory alloy wire's ability to transform between states. The system can adjust compression force levels and patterns in real-time based on user needs, providing high compression when required for recovery while allowing relaxation periods to maintain comfort and user compliance throughout extended wear periods
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 consistent and precise compression across the body, enhancing muscle recovery, reducing muscle damage, and improving venous return, while being lightweight, portable, and comfortable, thus increasing compliance and reducing the risk of vascular issues.
Implementation Method 1
the wire element is made of a shape changing material such as a shape memory alloy
Data Source
AI summary
A compression appliance includes a textile-based wrap, an electronic assembly, and wiring comprising a single wire looped through the length of the wrap. The wiring comprises shape changing materials that are used to apply controllable intermittent sequential compression or constriction pressure to a body portion of a person when the compression appliance is wrapped around the body portion. The appliance can incorporate a pre-tensioning element that applies a known initial tension to the shape changing material prior to activation of a compression cycle. The wire can be then actuated according to a compression protocol to sequentially contract and release the wire. The proposed wiring and component configuration will need access to lower power and a reduced volume of hardware as compared to conventional compression appliances.