Multi-Layer Fluid Cushion Support to Reduce Pressure Ulcers
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Solution Overview
Problem
Conventional cushioning devices fail to evenly distribute pressure across a patient's body, leading to localized pressure points that can cause pressure ulcers, and increasing fluid volume to prevent bottoming out compromises stability and comfort.
Innovation Solution
A multi-layer cushion support system comprising a central chamber filled with a gas and a peripheral chamber filled with a more viscous liquid, such as mineral oil, with an optional cushioning foam layer positioned beneath or atop the system to enhance pressure distribution and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If fluid volume in a single bladder is increased to prevent bottoming out, then pressure distribution improves, but stability deteriorates
Solution Approach 1:
The single fluid bladder is divided into multiple separate bladders (first bladder, second bladder, third bladder) arranged in a triangular configuration. Each bladder independently supports specific regions of the patient's body, preventing bottoming out while maintaining system stability through the distributed triangular structure.
Solution Approach 2:
Each individual bladder is sized and positioned to provide localized support for specific body regions (sacrum, greater trochanter, ischial tuberosity). The bladders have different volumes and placements tailored to the specific pressure distribution needs of different anatomical areas.
2Strength
If fluid filled bladder is made thick to prevent bottoming out, then structural support improves, but pressure relief capability deteriorates
Solution Approach 1:
The bladders are constructed as thin, flexible membranes that can conform closely to the patient's body contours. This thin-film design allows the bladders to provide structural support through their pressurized volume while maintaining the flexibility needed to eliminate hammocking and provide uniform pressure distribution.
3Ease of operation
If conventional foam cushion is used to conform to body shape, then comfort improves, but pressure redistribution effectiveness deteriorates
Solution Approach 1:
The system uses fluid-filled bladders instead of foam materials. The fluid (water or air) within each bladder can flow and redistribute under applied load, dynamically adapting to body contours while effectively redistributing pressure across larger surface areas. The fluid's ability to move laterally prevents localized pressure points that occur with conventional foam.
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 multi-layer system effectively reduces peak pressure by up to 59% compared to no cushioning and 28% compared to conventional cushions, providing uniform support and preventing pressure ulcers.
Implementation Method 1
A multi-layer cushion support system comprising a central chamber filled with a gas and a peripheral chamber filled with a more viscous liquid
Implementation Method 2
a peripheral chamber filled with a more viscous liquid, such as mineral oil
Data Source
AI summary
Multi-layer cushion supports are described which may generally comprise a first support having a first contact surface for contacting a portion of a body and a second surface opposite to the first surface, the first support defining a central chamber and a peripheral chamber surrounding the central chamber, wherein the first support is filled with a first gas or liquid and a second support attached to the first support along the first contact surface. The second support may be filled with a second gas or liquid which is relatively more viscous than the first gas or liquid. In particular, the first support may be filled with a volume of air and the second support may be filled with oil which is less than the volume of air.