Multi-Position Valve Assembly for Wheelchair Air Cushion Zone Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current inflatable air cushions for wheelchairs lack effective adjustability and customization, particularly in distributing pressure across different air zones, which can lead to tissue damage and pressure sores due to inadequate control over air flow between zones.
Innovation Solution
A multi-position airflow control assembly that includes a valve housing, valve body, connectors, and a control assembly with a seal member and actuation assembly, allowing for selective fluid connection or isolation of different air zones, enabling improved adjustability and customization by rotating the seal member to change fluid connections between zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If all air cells are configured to communicate with each other and exist at the same internal pressure, then the cushion structure is simple and easy to manufacture, but the adjustability and customization capability is poor
Solution Approach 1:
The air cushion is divided into multiple independently controllable air zones (first air zone, second air zone, third air zone, fourth air zone) separated by valve assemblies. Each zone can be individually inflated, deflated, or pressure-regulated through dedicated connectors and seal members, allowing customized pressure distribution across different seating areas to adapt to user-specific pressure relief needs.
Solution Approach 2:
The valve assemblies incorporate rotatable seal members that can dynamically switch between multiple positions to change fluid communication pathways. The seal member can rotate to connect different air zones to the common inflator or to isolate zones independently, enabling real-time adjustment of air distribution and pressure across zones based on user requirements.
2Manufacturing precision
If a simple valve system is used, then the device complexity is low, but the control precision over air flow between zones is insufficient
Solution Approach 1:
Rotatable seal members act as intermediaries between the common inflator and multiple air zones. These seal members precisely control fluid communication by rotating to align sealing surfaces with specific connector ports, enabling accurate selection of which air zones receive inflation pressure from the single inflator without cross-contamination between zones.
Solution Approach 2:
A single common inflator serves multiple air zones through the multi-position valve system. The rotatable seal member enables one inflator to selectively service different air zones sequentially or simultaneously, replacing the need for multiple dedicated inflators while maintaining precise control over each zone's pressure independently.
3Manufacturing precision
If multiple independent inflators are used for different air zones, then the control precision is high, but the device complexity and cost increase
Solution Approach 1:
One common inflator is designed to serve multiple air zones through the multi-position valve assembly. The rotatable seal member enables the single inflator to selectively connect to different air zones, achieving the same air distribution control that would require multiple independent inflators, thereby reducing system complexity and cost while maintaining precise pressure control across all zones.
Data Source
AI summary
A multi-position airflow control assembly includes a valve housing, a valve body received by the valve housing, a plurality of connectors coupled to the valve body, each connector configured to fluidly connect to an inflation zone of a cellular cushion, and a control assembly partially received by the valve body. The control assembly includes a seal member, and an actuation assembly operably connected to the seal member and configured to rotate the seal member relative to the valve body. The seal member is configured to rotate between a first position and a second position.