Methods and systems for a dynamic support mattress to treat and reduce the incidence of pressure ulcers
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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 difficulty moving, such as diabetic, insensate, and paraplegic patients.
Innovation Solution
A multi-zoned mattress with varying densities and shapes, using foam materials to dynamically off-load pressure from critical anatomical areas, ensuring even blood oxygen saturation and reducing tissue ischemia by distributing weight and minimizing shear forces, thereby preventing and treating pressure ulcers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If powered mattresses with pneumatic zones are used to dynamically off-load pressure, then pressure distribution is improved, but device complexity and cost increase
Solution Approach 1:
The mattress uses the patient's own body weight to dynamically adjust pressure distribution. When a patient shifts weight onto one zone, the foam compression automatically increases support in adjacent zones, creating a self-regulating system that requires no external power or control mechanisms
Solution Approach 2:
The mattress employs foam materials with specific density ranges (1.8-2.28 lbs/ft³ for base structure, 2.7-3.39 lbs/ft³ for core layer, 3.65-4.62 lbs/ft³ for top layer) to achieve dynamic pressure adjustment through material property variations rather than mechanical actuation
2Measurement precision
If interface pressure measurements are used to predict pressure ulcer development, then early detection is possible, but measurement reliability is insufficient
Solution Approach 1:
The patent replaces mechanical pressure measurement systems with near-infrared spectroscopy, an optical method that directly measures tissue oxygen saturation levels to assess ischemia risk, providing more reliable prediction of pressure ulcer development
Solution Approach 2:
The system uses near-infrared spectroscopy to measure oxygen saturation in tissues, leveraging the absorption characteristics of oxygenated hemoglobin to provide real-time assessment of tissue health and ischemia risk
3Ease of manufacture
If a single-density foam mattress is used, then manufacturing is simple, but pressure distribution effectiveness is reduced
Solution Approach 1:
The mattress is constructed with three distinct foam layers of varying densities (base structure: 1.8-2.28 lbs/ft³, core layer: 2.7-3.39 lbs/ft³, top layer: 3.65-4.62 lbs/ft³) to provide different mechanical properties in different zones, optimizing both pressure distribution and manufacturing feasibility
Solution Approach 2:
The mattress combines multiple foam materials with different density characteristics to create a composite structure that achieves superior pressure off-loading performance while maintaining manufacturing simplicity through layered construction
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 levels 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, and compressing the first zone increases the support provided to the patient by the first zone
Implementation Method 2
A multi-zoned mattress with varying densities and shapes, using foam materials to dynamically off-load pressure from critical anatomical areas, ensuring even blood oxygen saturation and reducing tissue ischemia by distributing weight
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.