Multi-Zone Support Mattress for Pressure Off-Loading
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current mattress designs for preventing and treating pressure ulcers rely on unreliable interface pressure measurements, failing to effectively reduce the incidence of pressure ulcers in bedfast patients, particularly those with limited mobility, as they do not adequately address tissue oxygenation and ischemia.
Innovation Solution
A multi-zoned mattress with varying densities and materials, including polyurethane and synthetic latex foams, dynamically off-loads pressure by conforming to anatomical areas, equalizing blood oxygen saturation and reducing shear forces, using near-infrared spectroscopy to optimize oxygen levels around bony prominences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If interface pressure measurements are used to design mattresses, then pressure distribution can be monitored, but the reliability of pressure ulcer prevention is insufficient
Solution Approach 1:
The patent changes the measurement parameter from interface pressure (mmHg) to tissue oxygen saturation (StO2) using near-infrared spectroscopy. This parameter change provides more reliable prediction of pressure ulcer development because oxygen saturation directly reflects tissue ischemia status rather than just interface pressure. The system monitors StO2 levels in real-time to dynamically adjust mattress support zones.
Solution Approach 2:
The patent replaces the mechanical pressure measurement system with an optical detection system (near-infrared spectroscopy). This substitution allows non-invasive measurement of tissue oxygen saturation without requiring pressure sensors at the interface, providing more accurate information about actual tissue condition beneath the mattress.
2Adaptability or versatility
If non-powered mattresses with varying density foams are used, then cost is reduced and adaptability to patient weights is improved, but dynamic pressure off-loading capability is limited
Solution Approach 1:
The patent uses foam materials with varying densities (different ILD values) in different zones to create dynamic pressure redistribution. When a patient's weight compresses a high-density foam zone, the material's inherent viscoelastic properties cause it to deform and redirect pressure to adjacent lower-density zones, achieving dynamic off-loading without powered mechanisms.
Solution Approach 2:
The mattress employs composite foam structures with multiple layers of different materials (polyurethane, synthetic latex) and densities. This composite construction allows each zone to respond differently to applied pressure, creating a dynamic system that adapts to patient weight and position while remaining non-powered.
3Ease of operation
If powered mattresses with alternating pressure zones are used, then dynamic pressure redistribution is improved, but cost and device complexity increase
Solution Approach 1:
The mattress performs dynamic pressure redistribution automatically through the inherent mechanical properties of the foam materials. When pressure is applied to one zone, the foam's compression and lateral expansion properties naturally redirect the load to adjacent zones without requiring external power or control systems. The system serves itself through material physics.
Solution Approach 2:
The patent changes from active powered pressure adjustment to passive mechanical pressure redistribution by selecting foam materials with specific density and ILD parameters. The material parameters are engineered so that under compression, the foam automatically redirects pressure laterally to adjacent zones, achieving the same functional effect as powered systems but through material properties alone.
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 mattress effectively reduces the risk and treatment of pressure ulcers by maintaining high oxygen saturation in tissues, outperforming more expensive powered mattresses in maintaining oxygen levels in critical areas, while being cost-effective and adaptable to different patient weights and positions.
Implementation Method 1
The second zone includes a structure adapted to compress the first and third zones based on weight applied to the second zone
Implementation Method 2
a first zone adapted to conform to a first body part and a second zone adapted to provide support to a second body part
Data Source
AI summary
Systems, methods, and apparatus are provided for preventing and treating pressure ulcers in bedfast patients. The invention includes providing a non-powered mattress having a first zone adapted to conform to a first body part and a second zone adapted to provide support to a second body part, and off-loading interface pressure on the first body part to the second body part by dynamically increasing the support provided to the second body part by the second zone based on a weight of the first body part on the first zone. The off-loading of interface pressure from the first body part to the second body part equalizes blood oxygen saturation in tissue of the first and second body parts. Numerous additional aspects are disclosed.