Pneumatic Mattress Cell Layout for Slip-Free Alternating Support
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Pneumatic mattresses face a dichotomy between simplicity and support, as separate independent cells can lead to anatomical slipping between deflated cells, while integrally fabricated cells provide better support but are more complex and costly.
Innovation Solution
The mattress features an array of inner cells with pneumatic connectors along the edges, allowing for physical and pneumatic connection between edge cells and inner cells, enabling cyclic pressurization and deflation in sequences to simulate movement and prevent slipping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If separate independent cells are used, then simplicity and cost-effectiveness are improved, but anatomical slipping occurs between deflated cells
Solution Approach 1:
The mattress is divided into multiple independent pneumatic cells arranged in an array, allowing each cell to be manufactured and assembled separately. This segmentation maintains simplicity and cost-effectiveness while enabling the cyclic pressurization and deflation of individual cells to prevent anatomical slipping through coordinated inflation sequences.
Solution Approach 2:
The pneumatic cells are cyclically pressurized and exhausted in sequence, creating periodic action that simulates natural movement. This periodic inflation and deflation prevents anatomical slipping by ensuring that as one cell deflates, adjacent cells are pressurized to maintain support and prevent skin folds.
2Reliability
If integrally fabricated cells are used, then support and prevention of anatomical slipping are improved, but device complexity and cost increase
Solution Approach 1:
Rather than using a single integrally fabricated cell structure, the system segments the mattress into multiple independent cells connected through pneumatic conduits. This segmentation reduces manufacturing complexity and cost while maintaining the support function through coordinated cyclic pressurization of multiple smaller cells.
Solution Approach 2:
The pneumatic connectors and conduits serve multiple functions: they physically connect adjacent cells, enable pneumatic communication for pressure equalization, and facilitate cyclic inflation/deflation sequences. This multi-functionality reduces the need for separate components, thereby reducing overall device complexity.
3Device complexity
If cells are pressurized and exhausted in phase, then structural simplicity is maintained, but support effectiveness is reduced when one cell deflates
Solution Approach 1:
Instead of pressurizing and exhausting all cells in phase, the system implements periodic action with sequential phases where different sets of cells are pressurized at different times. This ensures that when one cell deflates, adjacent cells are either maintaining pressure or being pressurized, thereby maintaining continuous support effectiveness.
Solution Approach 2:
The system prepares for potential cell deflation by having adjacent cells in different pressure states. Before a cell fully deflates, neighboring cells are already pressurized to provide support, preventing the patient from being dropped onto the hard bed base. This prior cushioning approach maintains support effectiveness without requiring complex real-time monitoring.
Data Source
AI summary
A pneumatic mattress has two edge cells and transverse inner cells, arranged in adjacent pairs as alternate cells. An inflation hose has internal pipes, which receive alternating pneumatic pressure for the cells via extensions to connectors at both ends of cells. The edge cells are physically connected to the inner cells via the connectors.