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San Antonio, TX, United States

Cormier J.,Biodynamic Research Corporation
Journal of biomechanical engineering | Year: 2011

The current understanding of the tolerance of the frontal bone to blunt impact is limited. Previous studies have utilized vastly different methods, which limits the use of statistical analyses to determine the tolerance of the frontal bone. The purpose of this study is to determine the tolerance of the frontal bone to blunt impact. Acoustic emission sensors were used to provide a noncensored measure of the frontal bone tolerance and were essential due to the increase in impactor force after fracture onset. In this study, risk functions for fracture were developed using parametric and nonparametric techniques. The results of the statistical analyses suggest that a 50% risk of frontal bone fracture occurs at a force between 1885 N and 2405 N. Subjects that were found to have a frontal sinus present within the impacted region had a significantly higher risk of sustaining a fracture. There was no association between subject age and fracture force. The results of the current study suggest that utilizing peak force as an estimate of fracture tolerance will overestimate the force necessary to create a frontal bone fracture. Source


Sherwood D.,University of Texas at San Antonio | Sponsel W.E.,University of Texas at San Antonio | Lund B.J.,U.S. Army | Gray W.,University of Texas at San Antonio | And 7 more authors.
Investigative Ophthalmology and Visual Science | Year: 2014

Purpose. We qualitatively describe the anatomic features of primary blast ocular injury observed using a postmortem porcine eye model. Porcine eyes were exposed to various levels of blast energy to determine the optimal conditions for future testing. Methods. We studied 53 enucleated porcine eyes: 13 controls and 40 exposed to a range of primary blast energy levels. Eyes were preassessed with B-scan and ultrasound biomicroscopy (UBM) ultrasonography, photographed, mounted in gelatin within acrylic orbits, and monitored with high-speed videography during blast-tube impulse exposure. Postimpact photography, ultrasonography, and histopathology were performed, and ocular damage was assessed. Results. Evidence for primary blast injury was obtained. While some of the same damage was observed in the control eyes, the incidence and severity of this damage in exposed eyes increased with impulse and peak pressure, suggesting that primary blast exacerbated these injuries. Common findings included angle recession, internal scleral delamination, cyclodialysis, peripheral chorioretinal detachments, and radial peripapillary retinal detachments. No full-thickness openings of the eyewall were observed in any of the eyes tested. Scleral damage demonstrated the strongest associative tendency for increasing likelihood of injury with increased overpressure. Conclusions. These data provide evidence that primary blast alone (in the absence of particle impact) can produce clinically relevant ocular damage in a postmortem model. The blast parameters derived from this study are being used currently in an in vivo model. We also propose a new Cumulative Injury Score indicating the clinical relevance of observed injuries. © 2014 The Association for Research in Vision and Ophthalmology, Inc. Source


Patent
Biodynamic Research Corporation | Date: 2013-03-14

System force-deformation measuring apparatuses (e.g., an apparatus that applies a quasi-static force), such as those, for example, configured to generate data (e.g., non-generic or accident-specific data) that assists in the reconstruction of vehicle collisions.


Wiechel J.F.,SEA Ltd. | Wiechel J.F.,Ohio State University | Scott W.R.,Biodynamic Research Corporation
ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE) | Year: 2013

A series of tip-over and off-the-dock impact tests were performed with stand-up forklifts in order to investigate the potential for injury to the operator of a forklift in these types of accidents when the forklift is equipped with an operator's compartment door. One Crown Equipment Company RR Model and one RC Model stand-up forklift were used in the impact tests. The only modification to the forklifts for the tests was the placement of a door on the entrance to the operator's compartment. A Hybrid III anthropomorphic test device (ATD) was placed in the operator's compartment as a human surrogate. During each test, head accelerations, chest accelerations, neck loads and lumbar loads were measured on the ATD. The motion of the forklift and the ATD were filmed with video and highspeed cameras. Results from the impact tests indicate that there is a high risk of head injury in a right side tip-over accident and a high risk of head injury and neck injury in a left side tip-over accident. There is a high risk of a head injury, neck injury and thoracic injury in off-the-dock forks-trailing accidents. In an offthe- dock forks-leading accident there is a high risk of arm/shoulder injury, head injury, and neck injury. In both tipover and off-the-dock forks-trailing accidents there is a high probability of an entrapment injury under the overhead guard on the forklift. Copyright © 2013 by ASME. Source


Patent
Biodynamic Research Corporation | Date: 2015-07-22

System force-deformation measuring apparatuses (e.g., an apparatus that applies a quasi-static force), such as those, for example, configured to generate data (e.g., non-generic or accident-specific data) that assists in the reconstruction of vehicle collisions.

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