Dynamic impact response characteristics of a helmeted Hybrid III headform using a centric and non-centric impact protocol

Walsh, Evan S; Post, Andrew; Rousseau, Philippe; Kendall, Marshall; Karton, Clara; Oeur, Anna; Foreman, Scott; Hoshizaki, T. Blaine

doi:10.1177/1754337112442299

Cited by 12 publications

(14 citation statements)

References 14 publications

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“…When comparing the helmets on linear acceleration alone, 36 only helmet C performed better than the other models, while the rest were equivalent, and all passed the current standard. 4 This pattern is seen throughout the dynamic-dependent variables, with helmet C producing significantly lower values than the majority of the other helmet models.…”

Section: Resultsmentioning

confidence: 93%

“…Helmet C consistently out-performed the others across impact conditions for dynamic response, and helmets C and A performed the best using brain tissue values. Helmets B and F tended to result in the highest values for dynamic response, 36 with helmets B and D having the highest values for brain tissue deformation.…”

Section: Resultsmentioning

confidence: 94%

“…The dynamic response data of the impacts collected in this research were reported in a previous paper by Walsh et al; 36 sample time histories for each of the five impact sites are found in the Appendix (Figures 4–8). A finite element simulation for each impact was run using the UCDBTM.…”

Section: Resultsmentioning

confidence: 99%

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The application of brain tissue deformation values in assessing the safety performance of ice hockey helmets

Hoshizaki

Walsh

Post

et al. 2012

Proceedings of the Institution of Mechanical Engineers, Part P:

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Dynamic impact responses and brain tissue deformations from helmeted centric and non-centric headform impacts were assessed with respect to suggested concussive injury thresholds from the literature. Results from six commercially available ice hockey helmets were compared statistically. It is proposed that the current centric impact standards for ice hockey helmets measuring linear acceleration have effectively eliminated traumatic head injuries in the sport, but that angular acceleration and brain tissue deformation metrics are more sensitive to the conditions associated with concussive injuries which continue to be a major injury in the sport.

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Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 94%

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The application of brain tissue deformation values in assessing the safety performance of ice hockey helmets

Hoshizaki

Walsh

Post

et al. 2012

Proceedings of the Institution of Mechanical Engineers, Part P:

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“…50,64,65 This model has been used in several recent papers for head impacts, head injury, helmet design, and concussion prediction. 29,45,64–67…”

Section: Methodsmentioning

confidence: 99%

“…25,27,28 In addition, the majority of all head-to-head impacts are not through the center of gravity of the head, resulting in a larger rotational component to the impact. 3,29,30 Therefore, the most common impact event in football, the head-to-head collision, results in a high risk of concussive injury, yet the current helmet is not designed specifically to protect against it. 31,32 The discrepancy between the impact event mechanism of concussive injury and the design and testing of current helmets may explain why the rate of concussion remains high.…”

Section: Introductionmentioning

confidence: 99%

The effect of a novel impact management strategy on maximum principal strain for reconstructions of American football concussive events

Taylor

Post

Hoshizaki

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part P:

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The purpose of this study was to test the effectiveness of a helmet to reduce maximum principal strain by decoupling the head–helmet interface in reconstructions of head-to-head concussive impacts in American football. The primary goal of the American football helmet has been protection of players against skull fractures and other traumatic brain injuries. The modern-day helmet has evolved and been designed to mitigate traumatic brain injury, but it does not offer optimized protection against concussive injury. Studies to determine the influence of decoupling strategies on changes to brain motion and the resulting influence on maximum principal strain, a metric associated with concussive injury, have not yet been examined under concussive impact conditions. In this study, 19 helmet-to-helmet concussive events from professional American football were reconstructed using a pneumatically driven linear impactor to determine the components (resultant and dominant) of linear and rotational acceleration. The University of College Dublin Brain Trauma Model was used to determine maximum principal strain values. A prototype helmet with a decoupling liner strategy was shown to significantly reduce maximum principal strain in seven of the head-to-head concussive impact reconstructions. In each case, the prototype helmet significantly reduced the dominant coordinate component of rotational acceleration. The results of this study indicate the potential of a helmet liner decoupling system in reducing maximum principal strain for reconstructions of concussive events in American football.

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Comparison of Ice Hockey Goaltender Helmets for Concussion Type Impacts

et al. 2018

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Concussions are among the most common injuries sustained by ice hockey goaltenders and can result from collisions, falls and puck impacts. However, ice hockey goaltender helmet certification standards solely involve drop tests to a rigid surface. This study examined how the design characteristics of different ice hockey goaltender helmets affect head kinematics and brain strain for the three most common impact events associated with concussion for goaltenders. A NOCSAE headform was impacted under conditions representing falls, puck impacts and shoulder collisions while wearing three different types of ice hockey goaltender helmet models. Resulting linear and rotational acceleration as well as maximum principal strain were measured for each impact condition. The results indicate that a thick liner and stiff shell material are desirable design characteristics for falls and puck impacts to reduce head kinematic and brain tissue responses. However for collisions, the shoulder being more compliant than the materials of the helmet causes insufficient compression of the helmet materials and minimizing any potential performance differences. This suggests that current ice hockey goaltender helmets can be optimized for protection against falls and puck impacts. However, given collisions are the leading cause of concussion for ice hockey goaltenders and the tested helmets provided little to no protection, a clear opportunity exists to design new goaltender helmets which can better protect ice hockey goaltenders from collisions.

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Dynamic impact response characteristics of a helmeted Hybrid III headform using a centric and non-centric impact protocol

Cited by 12 publications

References 14 publications

The application of brain tissue deformation values in assessing the safety performance of ice hockey helmets

The application of brain tissue deformation values in assessing the safety performance of ice hockey helmets

The effect of a novel impact management strategy on maximum principal strain for reconstructions of American football concussive events

Comparison of Ice Hockey Goaltender Helmets for Concussion Type Impacts

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