Layered Helmet Liner with Air Bladder for Concussion Protection
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Solution Overview
Problem
Existing helmets do not adequately protect against concussions, as they fail to effectively absorb and disperse the impact forces that can lead to long-term cognitive issues, with many concussions going undetected or unreported.
Innovation Solution
A helmet liner comprising multiple layers: a multi-density polymer cushioning material, an air bladder filled with gas, and a viscoelastic rubber material, which work together to absorb, distribute, and disperse impact forces, reducing rotational and oscillatory forces on the head.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional single-layer helmet liner is used, then the helmet structure is simple and easy to manufacture, but it fails to adequately absorb and disperse impact forces, resulting in insufficient concussion protection
Solution Approach 1:
The helmet liner is divided into three distinct layers with different material properties: an outer energy-dissipating layer, a middle air bladder layer for force distribution, and an inner viscoelastic layer for shock absorption. Each layer performs a specific function in the impact mitigation sequence, transforming a single-layer structure into a multi-functional segmented system that effectively addresses concussion protection.
Solution Approach 2:
The invention combines three different material types in a composite liner structure: a rigid or semi-rigid outer layer material, an air-filled bladder material, and a viscoelastic inner layer material. This composite approach leverages the unique properties of each material to achieve superior impact protection that cannot be obtained with a single material, directly resolving the contradiction between protection effectiveness and structural simplicity.
2Strength
If a multi-layer liner with different materials is implemented, then impact force absorption and dispersion is significantly improved, but the manufacturing process becomes more complex and costly
Solution Approach 1:
By segmenting the liner into three manufacturable layers with clear interfaces, each layer can be produced using optimized processes for its specific material requirements, then assembled together. This segmentation approach manages manufacturing complexity by breaking down the multi-material construction into discrete, manageable components rather than attempting to create a monolithic multi-material structure.
Solution Approach 2:
The air bladder layer utilizes flexible membrane technology to create a thin, lightweight force-distribution layer that can be integrated between the outer and inner layers. This flexible film approach maintains the protective function while minimizing the thickness and material volume required, thereby reducing manufacturing complexity and cost compared to using thick rigid structures.
3Strength
If the liner uses only rigid materials for impact resistance, then structural strength is high, but the ability to absorb and disperse rotational and oscillatory forces is reduced
Solution Approach 1:
The liner applies local quality by using different material rigidities in different layers: the outer layer provides rigid structural support for initial impact resistance, while the inner viscoelastic layer provides compliant, energy-absorbing characteristics for rotational and oscillatory force mitigation. This spatial variation in material properties allows the single liner structure to simultaneously address both structural integrity and harmful force dispersion.
Solution Approach 2:
The composite liner structure combines rigid outer layer materials with compliant inner viscoelastic materials, creating a multi-phase composite that exhibits both strength and energy absorption characteristics. This material composite approach enables the liner to resist rigid impacts while simultaneously damping rotational and oscillatory forces through the viscoelastic properties of the inner layer.
4Reliability
If the helmet provides comprehensive concussion protection through advanced materials, then protection effectiveness increases, but the weight of the helmet increases
Solution Approach 1:
The air bladder layer utilizes pneumatic principles by filling a flexible chamber with air to create a lightweight yet effective force-distribution mechanism. Air provides substantial cushioning and force dispersion capability without the weight penalty of solid materials, enabling the helmet to achieve enhanced concussion protection while maintaining low weight. This pneumatic approach directly addresses the weight-protection contradiction.
Solution Approach 2:
The composite liner structure achieves high protection-to-weight ratio by combining lightweight materials across three layers: the outer layer uses thin rigid or semi-rigid material for structural support, the middle air bladder provides lightweight cushioning, and the inner viscoelastic layer offers lightweight shock absorption. This multi-material composite approach maximizes protective effectiveness while minimizing overall weight compared to using solid materials throughout.
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 layered liner significantly reduces the severity and frequency of concussions by converting unidirectional impacts into globally dispersed forces, stabilizing the head and brain, and providing enhanced collision impact protection.
Implementation Method 1
The first layer comprises a multi-density polymer cushioning material
Implementation Method 2
The second layer comprises an air bladder having an interior space that is filled with a gas
Implementation Method 3
The third layer comprises a viscoelastic rubber material that is configured to absorb the force of the impact and disperse energy from the force of the impact across the third layer
Implementation Method 4
viscoelastic rubber material that is configured to absorb the force of the impact and disperse energy
Data Source
AI summary
A shock absorbing helmet liner device for improving shock absorption and inhibiting head injuries includes a liner coupled to an internal surface of a helmet shell. The liner absorbs a force of an impact to the helmet shell to inhibit the force of the impact from injuring a user who is wearing the helmet shell. The liner has a first layer that includes a multi-density polymer cushioning material. A second layer is coupled to the first layer. The second layer includes an air bladder having an interior space that is filled with a gas. A third layer is coupled to the second layer. The third layer includes a viscoelastic rubber material that absorbs the force of the impact and disperses energy from the force of the impact across the third layer.