Dual-Position Arm Sling for Elbow Extension and Wrist Support
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Solution Overview
Problem
Traditional arm slings immobilize the elbow in a flexed position, leading to increased pressure in the cubital tunnel and risk of ulnar neuritis and carpal tunnel syndrome, and often fail to support the wrist adequately, causing hyperflexion and discomfort, while also restricting arm rotation and making daily activities difficult.
Innovation Solution
A dual-position arm sling apparatus that allows the elbow to be maintained in an extended, neutral rotation position, with the option to transition to an internal rotation position, providing support in both neutral and adducted orientations, and includes a garment design that distributes weight comfortably across the torso, reducing neck strain and allowing functional use of the arm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the elbow is immobilized in a flexed position, then the arm can be supported, but pressure in the cubital tunnel increases and ulnar neuritis risk increases
Solution Approach 1:
The arm sling apparatus allows dynamic positioning of the elbow between flexed and extended positions through adjustable straps and fasteners, enabling the user to transition from a supported flexed position to an extended position to relieve cubital tunnel pressure while maintaining arm support stability
Solution Approach 2:
The apparatus changes the elbow angle parameter from a fixed flexed position to an adjustable range including extended positions, thereby modifying the pressure distribution in the cubital tunnel region and reducing ulnar neuritis risk while preserving arm support
2Ease of operation
If the wrist is not adequately supported, then arm mobility is improved, but hyperflexion occurs and discomfort increases
Solution Approach 1:
The arm sling apparatus provides localized wrist support through a wrist cuff or strap that specifically targets the wrist region, allowing the wrist to be supported in a neutral position while the rest of the arm maintains mobility and freedom of movement
3Reliability
If the arm is restricted in rotation, then shoulder stability is improved, but daily activities become difficult
Solution Approach 1:
The apparatus transitions from restricting arm rotation to allowing dynamic rotation through adjustable straps that can be configured to permit rotational movement, enabling patients to perform daily activities while maintaining shoulder stability through controlled support
Solution Approach 2:
The arm sling apparatus is designed with multi-functional adjustability, allowing it to support the arm in various positions including rotated positions needed for daily activities, while still providing shoulder stability through its garment integration and adjustable support mechanisms
4Reliability
If a traditional arm sling is used, then the arm can be supported, but neck strain increases due to poor weight distribution
Solution Approach 1:
The arm sling apparatus uses a garment-based support system that distributes the arm weight across the torso and shoulders through a vest or gilet structure, counterbalancing the weight to prevent concentration of force on the neck and reduce neck strain while maintaining arm support
Data Source
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AI summary
A sling apparatus for supporting an arm of a person may include a garment to be worn on the torso, and arm support elements mounted on the garment that are configured to support the arm of the person wearing the garment in at least two positions with respect to the torso. The two positions may include a first position of the arm having the elbow extended with a shoulder associated with the arm of the person being in a neutral rotation orientation, and a second position of the arm having the shoulder associated with the arm being in an adducted, internal rotation position with the elbow flexed.