Threadless Prosthetic Valve Assembly with Magnetic Latch
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Solution Overview
Problem
Existing check valves used in prosthetic sockets require high dexterity for proper alignment and installation, posing difficulties for individuals with impaired upper extremities, and can be challenging to remove due to tight seals and friction.
Innovation Solution
A threadless valve assembly with a latched insert and magnetic coupling, featuring overlapping flange surfaces, resiliently biased latch arms, and adjustable air pressure release, allowing for easy insertion and removal without the need for precise threading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If threaded valve insert is used with fine pitch threads, then airtight seal is achieved, but high dexterity and hand-eye coordination are required for proper alignment and installation
Solution Approach 1:
The valve assembly is divided into separate components: a valve base and a valve insert. The insert can be independently attached to the base through threading, allowing for separate manufacturing and assembly. This segmentation enables the sealing function to be isolated in the insert while the base provides mounting support.
Solution Approach 2:
The patent replaces the traditional threaded connection system with an alternative mechanical attachment mechanism. Instead of relying solely on fine pitch threads that require precise alignment, the design incorporates features that facilitate easier coupling between the insert and base, reducing the dexterity requirements for installation.
2Reliability
If valve insert is tightly screwed into valve base, then quality of seal is improved, but friction increases making removal extremely difficult
Solution Approach 1:
The valve insert and base are designed with dynamic attachment characteristics. The connection allows for easy attachment through threading while incorporating features that enable controlled detachment. The mechanical design balances the tightening force needed for sealing with the ability to overcome friction during removal through proper force application.
3Reliability
If threaded connection is used for valve insert, then secure retention is achieved, but individuals with involved upper extremities cannot perform insertion or removal
Solution Approach 1:
The valve assembly is designed to be self-servicing where possible, with the valve insert capable of being attached and detached through simple mechanical actions. The design incorporates features that reduce the complexity of the operation, making it accessible to users with limited hand function by minimizing the required dexterity and force.
4Reliability
If valve base is located at most distal aspect of limb socket, then proper suspension pressure is maintained, but visibility and alignment angle become poor
Solution Approach 1:
The valve base is designed with a flanged structure that extends perpendicular to the socket surface, creating an accessible interface at a different spatial dimension. This flange provides a larger target area for alignment and a better angular approach for installation, while the valve insert maintains its position at the distal aspect of the socket for proper suspension pressure.
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
Facilitates easy mounting and removal of the valve insert, reducing friction and dexterity requirements, making it accessible for individuals with impaired upper extremities and ensuring a secure, adjustable seal for prosthetic applications.
Implementation Method 1
a threadless base supports an insert via O'rings and a magnetic coupling
Implementation Method 2
Resiliently biased latch arms are mounted to the insert and located to pivot during insert insertion and extraction
Implementation Method 3
O'ring seals the insert within the seat
Implementation Method 4
A spring biased valve piece or stem piece having adjustable air pressure release capabilities is concentrically supported in the insert
Data Source
AI summary
A valve assembly having a threadless base and a removable threadless insert that separately contains a check valve piece. The check valve piece is resiliently supported to abut a seal fitted to the insert. In one assembly, a pair of resiliently biased latch arms restrain the insert to the base. Flanges at the latch arms are resiliently biased to flex and grip the base as the insert is pushed into the base. Insert removal is effected with the release and lifting of the latch arms. In another assembly, the insert is magnetically coupled to the base and a resiliently biased check valve piece and setscrew adjuster regulates flow pressure.