Search Results

Head injuries are the most common injuries sustained by children in motor vehicle crashes regardless of age, restraint and crash direction. Previous research identified the front seat back as relevant contact point associated with head injuries sustained by restrained rear seated child occupants. The objective of this study was to conduct a test series of headform impacts to seat backs to evaluate the energy management characteristics of relevant contact points for pediatric head injury. A total of eight seats were tested: two each of 2007 Ford Focus, Toyota Corolla, 2006 Volvo S40, and 2008 Volkswagen Golf. Five to six contact points were chosen for each unique seat model guided by contact locations determined from real world crashes. Each vehicle seat was rigidly mounted in the center track position with the seatback angle adjusted to 70 degrees above the horizontal.

Pediatric Anthropomorphic Test Devices (ATDs) are valuable tools for assessing the injury mitigation capability of automotive safety systems. The neck pendulum test is widely used in biofidelity assessment and calibration of the ATD neck, and neck moment vs. angle response requirements are the metrics typically derived from the test. Herein, we describe the basis and methods for modifying the neck pendulum such that it more closely reflects base of the neck accelerations observed by a restrained three-year old ATD in a frontal crash. As a measure of base of the neck acceleration, the x-direction chest acceleration from thirty-one restrained Hybrid III three-year-old ATDs in vehicle frontal crash tests were analyzed. The standard neck pendulum yielded a mean peak acceleration that is 1.2x the peak of vehicle base of the neck accelerations, 1.6x the average, and 0.24x the duration.

Data presented in this paper demonstrated that the landscape for child occupant protection - the children and their restraints, vehicles, and crashes - is changing rapidly. Children are not small adults but are rather rapidly growing, developing, and changing and so too are their restraint needs. The past several years witnessed a growing awareness of these biomechanical challenges with the emergence of increased use of size-appropriate restraints for children under age 9 years and differences in patterns of injury by age. Vehicles involved in crashes with children reflect the trend overall: less passenger vans and cars and more light trucks, the majority of which are equipped with second generation air bags. The majority of crashes occurred on roads with posted speed limits below 45 miles per hour. The age group of particular concern is the newly driving teenage years (16-19) in which the crash and fatality rates are the highest among all age groups.

Data suggest that in response to substantial educational efforts, more children are being placed in the rear seats of vehicles. As this transition occurs, it is important to make efforts to optimize the performance of rear seat restraints for children. Prior to developing new restraints for children for the rear seat, a better understanding of child responses in various crash scenarios is needed. The objective of this study was to evaluate the performance of various restraint systems and countermeasures for child occupants in different crash scenarios. Sled tests were carried out with a Hybrid III 6 year old anthropomorphic test device (ATD) in frontal, oblique and side impact configurations. The performance of a highback and a backless booster seat was assessed. The results were compared with two standard 3 point belt restraint systems: 1. a package shelf mounted belt, and 2. a C-pillar mounted belt.

Restrained children between the ages of 3 to 15 years in crashes were identified in an on-going crash surveillance system (1998-2002) which links insurance claims data to telephone survey and crash investigation data. The risk of upper extremity injury associated with airbag deployment was estimated and a series of cases was examined using in-depth crash investigation to identify the mechanisms of these injuries. This study found that 3.5% of children who were exposed to a passenger airbag (PAB) received an upper extremity fracture, making them 2.5 times as likely to sustain an upper extremity fracture than children in similar crashes who were not exposed to a PAB. Female children were 2.2 times as likely to receive an isolated upper extremity fracture when exposed to a PAB than male children. The incidence rate, gender difference, and injury mechanism in children all appear to be similar to those of adults.

On-site, in-depth investigations were conducted on 14 crashes involving 15 children who sustained facial fractures. Of the 23 facial fractures documented, the most frequent were the nose (n=8), orbit (n=6), zygoma/maxilla (n=6), and mandible (n=3). The most frequent contact point of those seated in the rear was the rear of the front seat; of those seated in the front, the instrument panel. 11/15 had sub-optimal torso restraint resulting from placing the shoulder belt behind their back or sitting in a position only equipped with a lap belt. The data suggest that these injuries resulted from high-energy impact with interior vehicle components. Revision to FMVSS 201 to account for vehicle interior structures typically contacted by child occupants and enhancement of pediatric dummies to measure facial impact forces should be considered.