Knee Cushion Foam Geometry for Spinal Alignment and Pressure Relief
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Solution Overview
Problem
Existing knee cushions for side sleepers often fail to adequately reduce pressure points and maintain spinal alignment, leading to discomfort during rest or sleep.
Innovation Solution
A knee cushion with an integral foam member featuring a modified peace symbol design, including leg depressions and circular depressions, made from polyurethane foam, which allows for adjustable positioning and airflow to align hips and prevent knee bone contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a knee cushion is placed between the knees to reduce pressure points and align the spine, then comfort and sleep quality improve, but the device complexity increases due to the need for specific geometric configurations and materials
Solution Approach 1:
The knee cushion incorporates a modified peace symbol geometry with curved surfaces instead of flat planes. The circular depression at the center and the V-shaped leg depressions create contoured surfaces that naturally conform to the curvature of knees and hips, providing pressure relief and anatomical alignment without complex mechanical components
Solution Approach 2:
The cushion uses specific material parameters (foam density, elasticity, and firmness) to achieve the desired comfort and support functions. By carefully selecting and tuning these material parameters, the cushion provides therapeutic benefits for spine alignment and pressure point reduction while maintaining a simple overall device structure
2Ease of manufacture
If the knee cushion uses a simple geometric shape, then manufacturing ease improves, but the ability to accommodate different leg positions and provide proper alignment decreases
Solution Approach 1:
The knee cushion is divided into distinct functional zones: a central circular depression for knee placement, V-shaped leg depressions for lower leg support, and raised peripheral areas for hip alignment. This segmentation allows each zone to perform its specific function while maintaining a relatively simple monolithic foam structure that is easy to manufacture
Solution Approach 2:
The modified peace symbol geometry introduces asymmetric elements into the otherwise circular cushion design. The V-shaped leg depressions and raised areas create asymmetric zones that guide and accommodate legs in specific positions, providing versatility for different sleeping positions while remaining manufacturable as a single molded piece
3Stability of the object's composition
If the knee cushion uses raised profiles to keep knees elevated, then spinal alignment improves, but pressure points on the knees may increase
Solution Approach 1:
The cushion applies different surface qualities to different locations: the central circular depression provides a soft, recessed area that cradles the knee and distributes pressure, while the surrounding raised profiles provide firm support for hip and spine alignment. This local differentiation of surface quality allows simultaneous achievement of elevation and pressure relief
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 cushion provides comfort and relaxation by reducing pressure points, maintaining spinal alignment, and accommodating different leg positions, enhancing the quality of rest or sleep for side sleepers.
Implementation Method 1
an integral foam member having a first major surface, an oppositely aligned second major surface... The integral foam member has an Indentation Force Deflection at 25% of from between about 8 pounds-force to about 18 pounds-force
Implementation Method 2
The bottom surfaces can have upwardly extending raised areas to increase air flow
Data Source
AI summary
A knee cushion is disclosed which includes an integral foam member having a first major surface, an oppositely aligned second major surface, at least one side wall joining the first major surface to the second major surface. Leg depressions are formed in both the first and second major surfaces. The leg depressions are arranged in the shape of a modified peace symbol. The leg depressions permit a person to position the knee cushion between their knees while sleeping on their side to assist in aligning their hips and for keeping their spine straight. The integral foam member also includes a circular depression located in a central portion of the modified peace symbol on both the first and second major surfaces. Lastly the integral foam member has an Indentation Force Deflection at 25% of from between about 8 pounds-force to about 18 pounds-force.