Comparison of Innovated Thermoplastic Polyurethane and Commercial Helmet Lining Technology in Mitigating Concussions as Measured by Linear Accelerations and Risk of Head Injury During Simulated Horizontal Impacts to the Head

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URL: http://knowledgecommons.lakeheadu.ca:7070/handle/2453/4704

Abstract

Advances in helmet designs and technology have not completely eliminated the incidence of mild traumatic brain injuries (mTBI) in the sport of ice hockey. One issue that concerns researchers is that the vinyl nitrile (VN) and expanded polypropylenes (EPP) materials used to manufacture hockey helmets have remained the same since the implementation of mandatory helmets in the 1970s, due to the cost and capability of these materials to meet the aesthetic demands of the public. One potential avenue to address this concern is to use new thermoplastic polyurethane (TPU) lining materials in existing helmet shells to better mitigate impact forces while maintaining the aesthetic structure of the helmet. The TPU material has the desirable qualities of being tough, meaning that it is resistant to tearing. The TPU material also has highly elastic properties meaning that it can deform to absorb energy and quickly return to its original shape. Hence, the first purpose of this study was to compare the capability of the 3D printed TPU lining inserts to absorb energy during static loading to commercially available liners made from VN and EPP. The second purpose of this study was to determine the effectiveness of 3D printed TPU liners in reducing linear acceleration and risk of head injury from a simulated impact when compared to traditional liner materials during dynamic testing. The results from the static testing using a Chatillon TCD1100 Force Tester, indicated that the TPU liner absorbed 38.6% of the loading energy, which fell between the EPP (41.8%) and VN (15.8%) indicating that it performs approximately as well as, commercially available liners. The results from the simulated dynamic impacts to the head at five different locations, as defined by the NOCSAE protocol, revealed a significant interaction effect between impact location and liner type on measures of linear acceleration and risk of head injury. When examining the interaction effect, the results indicated that the EPP liner performed the best at the front and front boss locations, while the TPU liner performed the best at the side, rear boss, and rear locations. The primary implication of these results is that a hockey helmet lining material with multilayer characteristics composed of TPU and EPP structures would better mitigate impact forces from all locations to minimize the risk of concussions.

Cited Works (14)

Year	Entry
2004	Zhang L, Yang KH, King AI. A proposed injury threshold for mild traumatic brain injury. J Biomech Eng. 2004;126(2):226-236.
2011	Forero Rueda MA, Cuia L, Gilchrist MD. Finite element modelling of equestrian helmet impacts exposes the need to address rotational kinematics in future helmet designs. Comput Methods Biomech Biomed Eng. December 2011;14(12):1021-1031.
2014	Post A, Karton C, Hoshizaki TB, Gilchrist MD. Analysis of the protective capacity of ice hockey helmets in a concussion injury reconstruction. In: Proceedings of the 2014 International IRCOBI Conference on the Biomechanics of Injury. September 10-12, 2014; Berlin, Germany.72-80.
1953	Gurdjian ES, Lissner HR, Latimer FR, Haddad BF, Webster JE. Quantitative determination of acceleration and intracranial pressure in experimental head injury: preliminary report. Neurology. 1953;3(6):417-423.
1955	Gurdjian ES, Webster JE, Lissner HR. Observations on the mechanism of brain concussion, contusion, and laceration. Surg Gynecol Obstet. December 1955;101(6):680-690.
2010	Schmitt K-U, Niederer PF, Muser MH, Walz F. Trauma Biomechanics: Accidental Injury in Traffic and Sports. 2nd ed. Deidelberg, Germany: Springer; 2010.
2013	Rowson S, Duma SM. Brain injury prediction: assessing the combined probability of concussion using linear and rotational head acceleration. Ann Biomed Eng. May 2013;41(4):873-882.
2006	Kleiven S. Evaluation of head injury criteria using a finite element model validated against experiments on localized brain motion, intracerebral acceleration, and intracranial pressure. Int J Crashworthiness. 2006;11(1):65-79.
1966	Gadd CW. Use of a weighted-impulse criterion for estimating injury hazard. In: Proceedings of the 10th Stapp Car Crash Conference. November 8-9, 1966; Hollomon Air Force Base, NM. Warrendale, PA: Society of Automotive Engineers:164-174. SAE 660793.
2003	King AI, Yang KH, Zhang L, Hardy W, Viano DC. Is head injury caused by linear or angular acceleration? In: Proceedings of the 2003 International IRCOBI Conference on the Biomechanics of Impact. September 25, 2003; Lisbon, Portugal.1-12.
1966	Gurdjian ES, Roberts VL, Thomas LM. Tolerance curves of acceleration and intracrantal pressure and protective index in experimental head injury. J Trauma. September 1966;6(5):600-604.
2009	Rousseau P, Hoshizaki TB. The influence of deflection and neck compliance on the impact dynamics of a Hybrid III headform. Proc Inst Mech Eng Part P-J Sports Eng Tech. 2009;223(1):89-97.
2006	Pellman EJ, Viano DC, Withnall C, Shewchenko N, Bir CA, Halstead PD. Concussion in professional football: helmet testing to assess impact performance—Part 11. Neurosurgery. January 2006;58(1):78-95.
1975	Hodgson VR. National Operating Committee on Standards for Athletic Equipment football helmet certification program. Med Sci Sports. F, 1975;7(2):225-232.

Cited By (1)

Year	Entry
2022	Renyard N. Evaluating the Combined Effect of Thermoplastic Polyurethane Material in Ice Hockey Goaltender Helmets and Cervical Muscle Strength in Mitigating Concussion Risk During Simulated Horizontal Head Collisions [Master's thesis]. Thunder Bay, ON: Lakehead University; 2022.