The development of a next-generation polymeric headform surrogate for concussion and helmet evaluation

运动员使用头盔大大减少了头部撞击导致的严重脑损伤的发生率。尽管头盔被广泛使用，但脑震荡的发生率仍然存在问题。与大多数创伤性损伤不同，脑震荡可能不会对大脑造成明显的结构性损伤，但会导致神经功能障碍的快速发作。反复的创伤与神经退行性疾病有关，具有破坏性的心理健康结果，包括抑郁水平的增加，** 攻击性和自杀倾向。为减少脑损伤而实施的头盔测试标准包括监测跌落测试的头盔刚性人头模型的 ** 加速度曲线，以确保不超过临界 ** 阈值。硬加速度阈值可能不足以定义创伤的临界条件，特别是当撞击引起头部的旋转加速度时，或者当我们考虑重复的亚震荡撞击也导致显著的神经退行性变时。人类大脑的反应肯定比我们目前的测试所能解决的要复杂得多，需要一个新的评估基础。拟议的研究项目将联合收割机尸体测试与有限元建模相结合，以 ** 为下一代可变形人头模型的设计和验证提供信息，用于冲击测试。**这个新的人头模型将返回在撞击过程中发生的大脑变形的测量结果。由于大脑在撞击过程中会发生明显的变形，预计 ** 这种测量对对 ** 大脑有害的旋转力更敏感。完成后，开发的人头模型将为标准委员会提供一个可能取代当前标准的替代方案。推进头盔评估的状态 ** 有可能提高许多有脑震荡风险的加拿大人的长期生活质量。

The use of helmets by athletes has drastically reduced the incidence of severe brain injuries**resulting from head impacts. Despite widespread use of helmets, there continues to be a**concerning level of incidence of concussion. In contrast to the majority of traumatic injuries, a**concussion may not cause visible structural damage to the brain, but results in the rapidonset**of neurological dysfunction. Repeated trauma has been linked to a neurodegenerative**disease with devastating mental health outcomes, including increased levels of depression,**aggression, and suicidality.**Helmet testing standards implemented to reduce brain trauma involve monitoring the**acceleration profiles of a drop-tested helmeted rigid headforms to ensure that critical**thresholds are not exceeded. Hard acceleration thresholds may not be adequate to define**critical conditions for trauma, particularly when an impact induces a rotational acceleration of**the head or when we consider evidence that repeated subconcussive impacts have also led**to significant neurodegeneration. The response of a human brain is certainly more complex**than our current testing may be able to resolve, requiring a new basis of evaluation.**The proposed research project will combine cadaver testing with finite element modelling to**inform the design and validation of a next-generation deformable headform for impact testing.**This new headform will return measurements of brain deformation that occur during the**impact. Since the brain undergoes significant deformation during an impact, it is expected that**this measurement would be more sensitive to the rotational forces that are detrimental to the**brain. Upon completion, the developed headform will provide standards committees with an**alternative that may replace the current standards. Advancing the state of helmet evaluation**has the potential to increase the long-term quality of life for numerous Canadians at risk for**concussion.