The influence of human head tissue properties on intracranial pressure response during direct head impact

2006 ◽  
Vol 1 (4) ◽  
pp. 281 ◽  
Author(s):  
Jesse Ruan ◽  
Priya Prasad
Keyword(s):  
Intracranial Pressure ◽  
Human Head ◽  
Head Impact ◽  
Pressure Response ◽  
Tissue Properties ◽  
Direct Head

Investigation on Energy Absorption Characteristics of PVB Laminated Windshield Subject to Human Head Impact

2010 ◽  
Vol 34-35 ◽  
pp. 956-960 ◽  
Author(s):  
Bo Han Liu ◽  
Meng Yi Zhu ◽  
Yue Ting Sun ◽  
Jun Xu ◽  
Dong Yun Ge ◽  
...  
Keyword(s):  
Dynamic Behavior ◽  
Energy Absorption ◽  
Human Head ◽  
Head Impact ◽  
Laminated Glass ◽  
Absorption Property ◽  
Element Simulation ◽  
Impact Position ◽  
Two Parameters ◽  
Absorption Characteristics

In this paper, energy absorption characteristics of PVB laminated windshield subject to human head impact are studied. SHPB method is carried out to obtain the constitutive relationships of PVB laminated glass in dynamic behavior. With the SHPB results embedded, finite element simulation is used to study the dynamic behavior of PVB laminated windshield. In particular, energy absorption characteristics are investigated. Two parameters for measuring the energy absorption property of windshield are suggested, i.e. loss of head velocity and HIC value and a parametric study is carried out to see the effect of impact velocity and impact position. Results can shed lights on the research of energy absorption capability of PVB laminated windshield.

scholarly journals Evaluation of a laboratory model of human head impact biomechanics

2015 ◽  
Vol 48 (12) ◽  
pp. 3469-3477 ◽  
Author(s):  
Fidel Hernandez ◽  
Peter B. Shull ◽  
David B. Camarillo
Keyword(s):  
Human Head ◽  
Head Impact ◽  
Laboratory Model ◽  
Head Impact Biomechanics ◽  
Impact Biomechanics

Brazilian Jiu-Jitsu–Related Post-Concussion Symptoms Ameliorated With Neurorehabilitation

Neurology ◽  
2021 ◽  
Vol 98 (1 Supplement 1) ◽  
pp. S25.1-S25
Author(s):  
Frank Patterson ◽  
Matthew Michael Antonucci
Keyword(s):  
Academic Performance ◽  
Social Interactions ◽  
Head Trauma ◽  
Emotional Regulation ◽  
Head Impact ◽  
Whole Body ◽  
Trail Making Test ◽  
Direct Head ◽  
Trail Making ◽  
The Subject

ObjectiveDiscuss neurorehabilitation efficacy in a case of concussion without direct head impact.BackgroundWhile there is growing concern about the prevalence and severity of concussion in mixed martial arts, a grappling component, Brazilian Jiu-Jitsu, is not typically perceived as high risk. Rapid acceleration or deceleration without direct head trauma led to a concussion for a 15-year-old male during jiu-jitsu throwing drills. The subject and parents reported difficulty with academic performance, social interactions, and emotional regulation. Symptoms persisted for 4 months before care was sought by the subject and his parents. Without direct head trauma or impact, concussion was not initially suspected.Design/MethodsThirteen sessions of treatment were performed in a neurorehabilitation setting utilizing joint manipulation, vestibular rehabilitation with a whole-body off-axis rotation device, oculomotor exercises, neuromuscular re-education, and electrical stimulation. C3 Logix was utilized as a baseline (immediately preceding second treatment due to equipment difficulties) and at discharge to measure effects of treatment.ResultsData is reported as “(baseline, discharge, percent-change).” Graded Symptom Checklist score out of 162 (91, 20; −78.02%), Trail Making Test A (sec) (26.8, 19.7; −26.49%), Trail Making Test B (sec) (69.9, 37.9; −45.78%), Digit-Symbol Matching speed (# of symbols) (66, 71; +7.58%), Choice reaction time (msec) (452, 397; −12.17), Static:Dynamic Visual Acuity (line difference) (1, 0.4; −60%). Subjectively, the subject and his parents reported improved academic performance, social interactions, and emotional regulation leading to a better home and educational experience for all involved.ConclusionsThis case displays positive clinical improvements with a functional neurology approach to outpatient neurorehabilitation. Further investigation into this multimodal rehabilitation for post-concussion symptoms, with and without direct head impact, is recommended. Continued concussion education and awareness are recommended for sports with rapid acceleration or deceleration and limited direct head impact.

scholarly journals Game-Related Impacts in High School Boys’ Lacrosse

2019 ◽  
Vol 7 (4) ◽  
pp. 232596711983558 ◽  
Author(s):  
Shane V. Caswell ◽  
Patricia Kelshaw ◽  
Andrew E. Lincoln ◽  
Lisa Hepburn ◽  
Reginald Dunn ◽  
...  
Keyword(s):  
High School ◽  
Rotational Velocity ◽  
Linear Acceleration ◽  
The United States ◽  
Head Impact ◽  
Level Of Evidence ◽  
Cross Sectional ◽  
Head Impacts ◽  
Direct Head ◽  
The Impact

Background: The rate of concussions in boys’ lacrosse is reported to be the third highest among high school sports in the United States, but no studies have described game-related impacts among boys’ lacrosse players. Purpose: To characterize verified game-related impacts, both overall and those directly to the head, in boys’ varsity high school lacrosse. Study Design: Cross-sectional study; Level of evidence, 3. Methods: A total of 77 male participants (mean age, 16.6 ± 1.2 years; mean height, 1.77 ± 0.05 m; mean weight, 73.4 ± 12.2 kg) were instrumented with sensors and were videotaped during 39 games. All verified game-related impacts ≥20 g were summarized in terms of frequency, peak linear acceleration (PLA), and peak rotational velocity (PRV). Descriptive statistics and impact rates per player-game (PG) with corresponding 95% CIs were calculated. Results: Overall, 1100 verified game-related impacts were recorded (PLA: median, 33.5 g [interquartile range (IQR), 25.7-51.2]; PRV: median, 1135.5 deg/s [IQR, 790.0-1613.8]) during 795 PGs. The rate for all verified game-related impacts was 1.38 impacts per PG (95% CI, 1.30-1.47). Of these, 680 (61.8%) impacts (PLA: median, 35.9 g [IQR, 26.7-55.5]; PRV: 1170.5 deg/s [IQR, 803.2-1672.8]) were directly to the head (impact rate, 0.86 impacts/PG [95% CI, 0.79-0.92]). Overall, midfielders (n = 514; 46.7%) sustained the most impacts, followed by attackers (n = 332; 30.2%), defenders (n = 233; 21.2%), and goalies (n = 21; 1.9%). The most common mechanisms for overall impacts and direct head impacts were contact with player (overall: n = 706 [64.2%]; head: n = 397 [58.4%]) and stick (overall: n = 303 [27.5%]; head: n = 239 [35.1%]), followed by ground (overall: n = 73 [6.6%]; head: n = 26 [3.8%]) and ball (overall: n = 15 [1.4%]; head: n = 15 [2.2%]). Direct head impacts were associated with a helmet-to-helmet collision 31.2% of the time, and they were frequently (53.7%) sustained by the players delivering the impact. Nearly half (48.8%) of players delivering contact used their helmets to initiate contact that resulted in a helmet-to-helmet impact. Players receiving a head impact from player contact were most often unprepared (75.9%) for the collision. Conclusion: The helmet is commonly used to initiate contact in boys’ high school lacrosse, often targeting defenseless opponents. Interventions to reduce head impacts should address rules and coaching messages to discourage intentional use of the helmet and encourage protection of defenseless opponents.

scholarly journals Computational Modeling of Skull Bone Structures and Simulation of Skull Fractures Using the YEAHM Head Model

Biology ◽  
2020 ◽  
Vol 9 (9) ◽  
pp. 267 ◽  
Author(s):  
Alcino Barbosa ◽  
Fábio A. O. Fernandes ◽  
Ricardo J. Alves de Sousa ◽  
Mariusz Ptak ◽  
Johannes Wilhelm
Keyword(s):  
Computational Models ◽  
Soft Tissues ◽  
Constitutive Models ◽  
Human Head ◽  
Head Model ◽  
Head Impacts ◽  
Skull Model ◽  
Linear Behavior ◽  
Local Material ◽  
Direct Head

The human head is a complex multi-layered structure of hard and soft tissues, governed by complex materials laws and interactions. Computational models of the human head have been developed over the years, reaching high levels of detail, complexity, and precision. However, most of the attention has been devoted to the brain and other intracranial structures. The skull, despite playing a major role in direct head impacts, is often overlooked and simplified. In this work, a new skull model is developed for the authors’ head model, the YEAHM, based on the original outer geometry, but segmenting it with sutures, diploë, and cortical bone, having variable thickness across different head sections and based on medical craniometric data. These structures are modeled with constitutive models that consider the non-linear behavior of skull bones and also the nature of their failure. Several validations are performed, comparing the simulation results with experimental results available in the literature at several levels: (i) local material validation; (ii) blunt trauma from direct impact against stationary skull; (iii) three impacts at different velocities simulating falls; (iv) blunt ballistic temporoparietal head impacts. Accelerations, impact forces, and fracture patterns are used to validate the skull model.

Comparison of intracranial pressure response to cadaver head kinematics

2006 ◽  
Vol 39 ◽  
pp. S155 ◽  
Author(s):  
W.N. Hardy ◽  
M.J. Mason ◽  
C.D. Foster ◽  
K.H. Yang ◽  
A.I. King
Keyword(s):  
Intracranial Pressure ◽  
Pressure Response ◽  
Head Kinematics
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