The Experts below are selected from a list of 207 Experts worldwide ranked by ideXlab platform

Sébastien Roth - One of the best experts on this subject based on the ideXlab platform.

  • Thorax Injury CRITERIA ASSESSMENT THROUGH NON-LETHAL IMPACT USING AN ENHANCED BIOMECHANICAL MODEL
    Journal of Mechanics in Medicine and Biology, 2017
    Co-Authors: Michèle Bodo, A. Bracq, Rémi Delille, C. Marechal, Sébastien Roth
    Abstract:

    Ballistic Injury refers to the interaction of a projectile and the human body, resulting in penetration or blunt trauma. In order to consider both consequences, a hydrodynamic elastoplastic constitutive law was implemented in a numerical FE model of the human torso to simulate soft tissues behavior and to evaluate their Injury risk. This law, derived from 20% ballistic gelatin, was proven to be very efficient and biofidelic for penetrating ballistic simulation in soft tissues at very high velocity. In this study, the ability of the hydrodynamic law to simulate blunt ballistic trauma is evaluated by the replication of Bir et al.’s (2004) experiments, which is a reference test of the literature for nonpenetrating ballistic impact. Lung Injury criteria were also investigated through the Bir et al.’s experiments numerical replication. Human responses were evaluated in terms of mechanical parameters, which can be global (acceleration of the body, viscous criteria and impact force) or local (stress, pressure and displacement). Output results were found to be in experimental corridors developed by Bir et al., and the maximum pressure combined with the duration of the peak of pressure in the lungs seems to be a good predictor for lung Injury.

  • UNCERTAINTIES OF IMPACT CONFIGURATION FOR NUMERICAL REPLICATIONS OF REAL-WORLD TRAUMA: A FE ANALYSIS
    Journal of Mechanics in Medicine and Biology, 2016
    Co-Authors: Michèle Bodo, Sébastien Roth
    Abstract:

    This study deals with free fall accident analysis involving adults, and their numerical replications using a finite element model of the human Thorax. The main purpose is to determine the role of body position at impact in the Thorax Injury risk appearance. For this study, cases of real-world free-fall provided by an emergency department were selected and investigated. These cases involved both male and female with an age range of 20 to 63 years, who sustained accidental free-fall with both injured and uninjured cases. The examination of the patients’ medical record provided helpful information to accurately perform numerical replications with the finite element model HUByx (Hermaphrodite Universal Biomechanical yx model) which was already validated for various experimental tests in the field of automobile, ballistic impacts and blast. The results of simulations at different impact location allowed highlighting the crucial influence of the body orientation in the risk of thoracic Injury occurrence.

  • From military to civil loadings: preliminary numerical-based Thorax Injury criteria investigations
    International journal for numerical methods in biomedical engineering, 2015
    Co-Authors: Aristide Awoukeng Goumtcha, Michèle Bodo, Lorenzo Taddei, Sébastien Roth
    Abstract:

    Effects of the impact of a mechanical structure on the human body are of great interest in the understanding of body trauma. Experimental tests have led to first conclusions about the dangerousness of an impact observing impact forces or displacement time history with PMHS (Post Mortem human Subjects). They have allowed providing interesting data for the development and the validation of numerical biomechanical models. These models, widely used in the framework of automotive crashworthiness, have led to the development of numerical-based Injury criteria and tolerance thresholds. The aim of this process is to improve the safety of mechanical structures in interaction with the body. In a military context, investigations both at experimental and numerical level are less successfully completed. For both military and civil frameworks, the literature list a number of numerical analysis trying to propose Injury mechanisms, and tolerance thresholds based on biofidelic Finite Element (FE) models of different part of the human body. However the link between both frameworks is not obvious, since lots of parameters are different: great mass impacts at relatively low velocity for civil impacts (falls, automotive crashworthiness) and low mass at very high velocity for military loadings (ballistic, blast). In this study, different accident cases were investigated, and replicated with a previously developed and validated FE model of the human Thorax named Hermaphrodite Universal Biomechanical model ( model). These previous validations included replications of standard experimental tests often used to validate models in the context of automotive industry, experimental ballistic tests in high speed dynamic impact and also numerical replication of blast loading test ensuring its biofidelity. In order to extend the use of this model in other frameworks, some real world accidents were reconstructed and consequences of these loadings on the FE model were explored. These various numerical replications of accident coming from different contexts raise the question about the ability of a FE model to correctly predict several kinds of trauma, from blast or ballistic impacts to falls, sports or automotive ones in a context of numerical Injury mechanisms and tolerance limits investigations. This article is protected by copyright. All rights reserved. Language: en

Sridhar Shankar - One of the best experts on this subject based on the ideXlab platform.

  • Imaging of Acute Thoracic Trauma
    Emergency Radiology, 2013
    Co-Authors: Neil Patel, Ajay Singh, Sridhar Shankar
    Abstract:

    Thorax Injury remains the third most common type of Injury in trauma patients. With the number of trauma cases on the increase, the incidence of injuries to the Thorax is proportionally increasing. The overall mortality rate of thoracic trauma is approximately 10 % and is highest in patients with cardiac or tracheobronchial-esophageal injuries. More than two-thirds of cases of trauma in developed countries are caused by motor vehicle collisions. The remaining cases are the result of falls or blows from blunt objects.

Michèle Bodo - One of the best experts on this subject based on the ideXlab platform.

  • Thorax Injury CRITERIA ASSESSMENT THROUGH NON-LETHAL IMPACT USING AN ENHANCED BIOMECHANICAL MODEL
    Journal of Mechanics in Medicine and Biology, 2017
    Co-Authors: Michèle Bodo, A. Bracq, Rémi Delille, C. Marechal, Sébastien Roth
    Abstract:

    Ballistic Injury refers to the interaction of a projectile and the human body, resulting in penetration or blunt trauma. In order to consider both consequences, a hydrodynamic elastoplastic constitutive law was implemented in a numerical FE model of the human torso to simulate soft tissues behavior and to evaluate their Injury risk. This law, derived from 20% ballistic gelatin, was proven to be very efficient and biofidelic for penetrating ballistic simulation in soft tissues at very high velocity. In this study, the ability of the hydrodynamic law to simulate blunt ballistic trauma is evaluated by the replication of Bir et al.’s (2004) experiments, which is a reference test of the literature for nonpenetrating ballistic impact. Lung Injury criteria were also investigated through the Bir et al.’s experiments numerical replication. Human responses were evaluated in terms of mechanical parameters, which can be global (acceleration of the body, viscous criteria and impact force) or local (stress, pressure and displacement). Output results were found to be in experimental corridors developed by Bir et al., and the maximum pressure combined with the duration of the peak of pressure in the lungs seems to be a good predictor for lung Injury.

  • UNCERTAINTIES OF IMPACT CONFIGURATION FOR NUMERICAL REPLICATIONS OF REAL-WORLD TRAUMA: A FE ANALYSIS
    Journal of Mechanics in Medicine and Biology, 2016
    Co-Authors: Michèle Bodo, Sébastien Roth
    Abstract:

    This study deals with free fall accident analysis involving adults, and their numerical replications using a finite element model of the human Thorax. The main purpose is to determine the role of body position at impact in the Thorax Injury risk appearance. For this study, cases of real-world free-fall provided by an emergency department were selected and investigated. These cases involved both male and female with an age range of 20 to 63 years, who sustained accidental free-fall with both injured and uninjured cases. The examination of the patients’ medical record provided helpful information to accurately perform numerical replications with the finite element model HUByx (Hermaphrodite Universal Biomechanical yx model) which was already validated for various experimental tests in the field of automobile, ballistic impacts and blast. The results of simulations at different impact location allowed highlighting the crucial influence of the body orientation in the risk of thoracic Injury occurrence.

  • From military to civil loadings: preliminary numerical-based Thorax Injury criteria investigations
    International journal for numerical methods in biomedical engineering, 2015
    Co-Authors: Aristide Awoukeng Goumtcha, Michèle Bodo, Lorenzo Taddei, Sébastien Roth
    Abstract:

    Effects of the impact of a mechanical structure on the human body are of great interest in the understanding of body trauma. Experimental tests have led to first conclusions about the dangerousness of an impact observing impact forces or displacement time history with PMHS (Post Mortem human Subjects). They have allowed providing interesting data for the development and the validation of numerical biomechanical models. These models, widely used in the framework of automotive crashworthiness, have led to the development of numerical-based Injury criteria and tolerance thresholds. The aim of this process is to improve the safety of mechanical structures in interaction with the body. In a military context, investigations both at experimental and numerical level are less successfully completed. For both military and civil frameworks, the literature list a number of numerical analysis trying to propose Injury mechanisms, and tolerance thresholds based on biofidelic Finite Element (FE) models of different part of the human body. However the link between both frameworks is not obvious, since lots of parameters are different: great mass impacts at relatively low velocity for civil impacts (falls, automotive crashworthiness) and low mass at very high velocity for military loadings (ballistic, blast). In this study, different accident cases were investigated, and replicated with a previously developed and validated FE model of the human Thorax named Hermaphrodite Universal Biomechanical model ( model). These previous validations included replications of standard experimental tests often used to validate models in the context of automotive industry, experimental ballistic tests in high speed dynamic impact and also numerical replication of blast loading test ensuring its biofidelity. In order to extend the use of this model in other frameworks, some real world accidents were reconstructed and consequences of these loadings on the FE model were explored. These various numerical replications of accident coming from different contexts raise the question about the ability of a FE model to correctly predict several kinds of trauma, from blast or ballistic impacts to falls, sports or automotive ones in a context of numerical Injury mechanisms and tolerance limits investigations. This article is protected by copyright. All rights reserved. Language: en

Yang Hua - One of the best experts on this subject based on the ideXlab platform.

  • Clinical diagnosis and treatment of 112 patients with punctured Thorax Injury
    Journal of Traumatic Surgery, 2001
    Co-Authors: Yang Hua
    Abstract:

    Objective To describe and sum up the clinical features and clinical experience in diagnosis and treatment of punctured Thorax.?Methods The clinical data of 112 cases of breast punctured wound treated in our hospital in 1995-1999 were analysed.?Results Among 112 cases,there were 109 cases receiving definite early diagnosis and 3 cases of misdiagnosis.Ninety eight cases had closed drainage,and 52 cases had operations(27 thoracotomy,25 laparotomy).One hundred and five cases were cured and 5 cases died.?Conclusions (1)?The punctured Thorax Injury is often complicated by some other severe wounds and high rate of shock.(2)?Tardive pyoThorax,ruptured diaphragm and wound in the loin and back are likely to get missed diagnosis.(3)?Infection in thoracic cavity is a probable complication of thoraco abdominal Injury with missed diagnosis or improper handling in operation.(4)?Operation is a preferential treatment and early treatment may get desired results.

Aristide Awoukeng Goumtcha - One of the best experts on this subject based on the ideXlab platform.

  • From military to civil loadings: preliminary numerical-based Thorax Injury criteria investigations
    International journal for numerical methods in biomedical engineering, 2015
    Co-Authors: Aristide Awoukeng Goumtcha, Michèle Bodo, Lorenzo Taddei, Sébastien Roth
    Abstract:

    Effects of the impact of a mechanical structure on the human body are of great interest in the understanding of body trauma. Experimental tests have led to first conclusions about the dangerousness of an impact observing impact forces or displacement time history with PMHS (Post Mortem human Subjects). They have allowed providing interesting data for the development and the validation of numerical biomechanical models. These models, widely used in the framework of automotive crashworthiness, have led to the development of numerical-based Injury criteria and tolerance thresholds. The aim of this process is to improve the safety of mechanical structures in interaction with the body. In a military context, investigations both at experimental and numerical level are less successfully completed. For both military and civil frameworks, the literature list a number of numerical analysis trying to propose Injury mechanisms, and tolerance thresholds based on biofidelic Finite Element (FE) models of different part of the human body. However the link between both frameworks is not obvious, since lots of parameters are different: great mass impacts at relatively low velocity for civil impacts (falls, automotive crashworthiness) and low mass at very high velocity for military loadings (ballistic, blast). In this study, different accident cases were investigated, and replicated with a previously developed and validated FE model of the human Thorax named Hermaphrodite Universal Biomechanical model ( model). These previous validations included replications of standard experimental tests often used to validate models in the context of automotive industry, experimental ballistic tests in high speed dynamic impact and also numerical replication of blast loading test ensuring its biofidelity. In order to extend the use of this model in other frameworks, some real world accidents were reconstructed and consequences of these loadings on the FE model were explored. These various numerical replications of accident coming from different contexts raise the question about the ability of a FE model to correctly predict several kinds of trauma, from blast or ballistic impacts to falls, sports or automotive ones in a context of numerical Injury mechanisms and tolerance limits investigations. This article is protected by copyright. All rights reserved. Language: en