Helmet Open-Cell Foam Impact Threshold
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Solution Overview
Problem
Current protective helmets, particularly in contact sports, are inadequate in absorbing high-impact forces that can lead to traumatic brain injuries such as concussions, and lack effective monitoring systems to assess impact frequency and severity, posing a risk to athletes.
Innovation Solution
A helmet design featuring a solid open-cell phenolic resin foam that deforms irreversibly upon impacts above a selected threshold pressure (e.g., 70 G) to absorb energy, combined with an inner pad for resilient cushioning and optional sensors to monitor impacts and communicate data for real-time analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional energy absorbing liners are used in helmets, then the helmet provides basic cushioning, but the helmet fails to effectively absorb high-impact forces above a threshold that cause concussions
Solution Approach 1:
The patent applies parameter changes by utilizing the pressure-dependent mechanical properties of foam materials. The foam exhibits a threshold pressure below which it deforms elastically and above which it undergoes plastic collapse, enabling selective absorption of high-impact forces that cause concussions while allowing lower impacts to be cushioned reversibly.
Solution Approach 2:
The patent employs composite materials by combining foam material with the helmet shell and liner structure. The foam is integrated into the helmet assembly, creating a composite system where the foam's nonlinear mechanical properties complement the structural integrity of the helmet, providing enhanced concussion protection.
2Strength
If the helmet uses a rigid structure to protect against impacts, then the helmet provides structural integrity, but the helmet transmits excessive impact forces to the head
Solution Approach 1:
The patent utilizes parameter changes by exploiting the foam material's transition from elastic to plastic deformation at a threshold pressure. This allows the helmet to maintain structural integrity through the rigid shell while the foam progressively absorbs impact forces, reducing the force transmitted to the head as impact severity increases.
3Reliability
If the helmet provides comprehensive protection against all impacts, then the helmet maximizes safety, but the helmet cannot distinguish between safe and dangerous impacts requiring intervention
Solution Approach 1:
The patent applies color changes as a visual indicator system. The foam material or associated indicators change color based on the degree of compression experienced, allowing users to visually distinguish between impacts that remained below the concussion threshold (reversible deformation) and those that exceeded it (plastic collapse), providing immediate feedback on impact severity.
Solution Approach 2:
The patent implements feedback through visual indicators that provide immediate information about impact severity. The color-changing mechanism or visual markers allow users to assess whether an impact required medical evaluation, creating a feedback loop that informs subsequent decisions about athlete safety and intervention needs.
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 helmet effectively reduces the intensity of high-impact forces transmitted to the head, potentially preventing concussions and providing critical data for identifying high-risk athletes and determining appropriate interventions.
Implementation Method 1
a solid open-cell phenolic resin foam arranged to deform irreversibly in the event of an impact which applies a pressure greater than a selected threshold pressure to absorb the energy of the impact
Implementation Method 2
an inner pad configured to deform resiliently to cushion the head of a user
Data Source
Figure 1~2
Figure 3
Figure 4A~4B-4
AI summary
A helmet (10) comprising (i) an outer shell (12); (ii) an inner pad (14) configured to deform resiliently to cushion the head of a user; and (iii) a solid open-cell foam material (18) wherein the outer shell is spaced apart from the inner pad by the solid open-cell foam material and wherein the solid open-cell foam material is arranged to deform irreversibly in the event of an impact which applies a pressure greater than a selected threshold pressure to absorb the energy of the impact.