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Biomechanical Considerations for Assessing Interactions of Children and Small Occupants with Inflatable Seat Belts
Published November 11, 2013 by The Stapp Association in United States
Annotation ability available
NHTSA estimates that more than half of the lives saved (168,524) in car crashes between 1960 and 2002 were due to the use of seat belts. Nevertheless, while seat belts are vital to occupant crash protection, safety researchers continue efforts to further enhance the capability of seat belts in reducing injury and fatality risk in automotive crashes. Examples of seat belt design concepts that have been investigated by researchers include inflatable, 4-point, and reverse geometry seat belts. In 2011, Ford Motor Company introduced the first rear seat inflatable seat belts into production vehicles.
A series of tests with child and small female-sized Anthropomorphic Test Devices (ATD) and small, elderly female Post Mortem Human Subjects (PMHS) was performed to evaluate interactions of prototype inflatable seat belts with the chest, upper torso, head and neck of children and small occupants, from infants to young adolescents. Tests simulating a 6-year-old child asleep in a booster seat, with its head lying directly on its shoulder on top of the inflatable seat belt, were considered by engineering judgment, to represent a worst case scenario for interaction of an inflating seat belt with the head and neck of a child and/or small occupant.
All evaluations resulted in ATD responses below Injury Assessment Reference Values reported by Mertz et al. (2003). In addition, the tests of the PMHS subjects resulted in no injuries from interaction of the inflating seat belt with the heads, necks, and chests of the subjects. Given the results from the ATD and PMHS tests, it was concluded that the injury risk to children and small occupants from deployment of inflatable seat belt systems is low.
- Stephen W. Rouhana - Ford Motor Company
- Srinivasan Sundararajan - Ford Motor Company
- Derek Board - Ford Motor Company
- Priya Prasad (Retired) - Ford Motor Company
- Jonathan D. Rupp - University of Michigan Transportation Research Institute
- Carl S. Miller - University of Michigan Transportation Research Institute
- Thomas A. Jeffreys - University of Michigan Transportation Research Institute
- Lawrence W. Schneider - University of Michigan Transportation Research Institute
CitationRouhana, S., Sundararajan, S., Board, D., Prasad (Retired), P. et al., "Biomechanical Considerations for Assessing Interactions of Children and Small Occupants with Inflatable Seat Belts," SAE Technical Paper 2013-22-0004, 2013, https://doi.org/10.4271/2013-22-0004.
- Aduma, S., Oota, K., Nagumo, H., and Okabe, T. (2009) Development of a new airbag system for rear seat occupants. Proc. 21st International Technical Conference on the Enhanced Safety of Vehicles, Paper No. 09-0288, Stuttgart, Germany.
- American Academy of Pediatrics Committee on Injury, Violence, and Poison Prevention (2011) Technical report on child passenger safety. http://pediatrics.aappublications.org/content/127/4/e1050.full.html#related-urls.
- Andersson, M., Bohman, K., Osvalder, A.L. (2010) Effect of booster seat design on children's choice of seating positions during naturalistic riding. Annals of the Advances of Automotive Medicine 54: 171-180.
- Arbogast, K.B., Gholve, P.A., Friedman, J.E., Maltese, M.R., Tomasello, M.F., and Dormans, J.P. (2007) Normal cervical spine range of motion in children 3-12 years old. Spine 32(10): E309-E315.
- Athey, J. and Balser, J. (1998) A summary of the work of the SAE ATD Chest Deflection Task Team. Proc. 16th International Technical Conference on the Enhanced Safety of Vehicles, Paper No. 06-S9-W-27, Windsor, Canada.
- Augenstein, J., Digges, K., Bahouth, G., Perdeck, E., Dalmotas, D., and Stratton, J. (2005) Investigation of the performance of safety systems for protection of the elderly. Proc. Association for the Advancement of Automotive Medicine, 49: 361-370.
- Banglmaier, R.F., Pecoraro, K.M., Feustel, J.R., MacFarland, R.W., Scherer, R.D., and Rouhana, S.W. (2005) Development and evaluation of a proposed neck shield for the 5th percentile Hybrid III female dummy. Stapp Car Crash Journal 49: 509-31.
- Billault, P., Tisseron, C., Dejeammes, M., Biard, R., Cord, P., and Jenoc, P. (1979) The Inflatable Diagonal Belt (Improvement of protection in the case of frontal impact). Proc. of the Seventh International Technical Conference on Experimental Safety Vehicles, Paris, France.
- Bir, C. and Viano, D. (1999) Biomechanical predictor of Commotio Cordis in high-speed chest impact. J Trauma 47(3): 468-473.
- Bostrom, O. and Haland, Y. (2003) Benefits of a 3+2 point belt system and an inboard torso side support in frontal, far-side and rollover crashes. Proc. 18th International Technical Conference on the Enhanced Safety of Vehicles, Paper No. 03-0451, Nagoya, Japan.
- Bostrom, O., Haland, Y., Soderstrom, P. (2005) Seat integrated 3-point belt with reversed geometry and an inboard torso side-support airbag for improved protection in rollover. Proc. 19th International Technical Conference on the Enhanced Safety of Vehicles, Paper No. 05-0204, Washington, DC, USA.
- Burkes, J.M., Cromack, J.R., and Glenn, T.H. (1975) Human volunteer testing of the inflatable seat belt restraint. Proc. Association for the Advancement of Automotive Medicine, 19: 365-374.
- Burkes, J.M., Cromack, J.R., and Ziperman, H.H. (1975a) Impact Testing of Allied Chemical ‘Inflataband’ with dummies and human volunteers. Final Report, DOT HS 801 739, Vol. I.
- Burkes, J.M., Cromack, J.R., and Ziperman, H.H. (1975b) Impact testing of Allied Chemical ‘Inflataband’ with dummies and human volunteers. Final Report, DOT HS 801 739 Vol. II.
- Charlton, J., Koppel, S., Kopianathan, C., and Taranto, D. (2010) How do children really behave in restraint systems while traveling in cars? Annals of the Advances of Automotive Medicine 54: 181-191.
- Coppoletta, J.M., and Wolbach, S.B. (1933) Body length and organ weights of infants and children. Am J Pathology 9(1): 55-70.
- Cromack, J.R. (1980) Highlights of NHTSA's occupant restraint programs to 1979. Proc. American Association for the Advancement of Automotive Medicine 24: 379-395.
- Dau, N. (2007) Evaluation of injury criteria for predicting Commotio Cordis. American Society of Biomechanics, Abstract 141 (Poster 4-19) at 2007 ASB Meeting at Stanford University.
- Digges, K.H. and Morris, J.B. (1991) Opportunities for frontal crash protection at speeds greater than 35 mph. SAE Technical Paper Number 910807.
- Evans, L. (1986) The effectiveness of safety belts in preventing fatalities. Accident Analysis and Prevention 18: 229-241.
- Evans, L. (2004) Traffic Safety. Science Serving Society, Bloomfield Hills, MI.
- Ferrario, V.F., Sforza, C. Serrao, G., Grassi, G., and Mossi, E. (2002) Active range of motion of the head and cervical spine: A three-dimensional investigation of healthy young adults. J. Orthopaedic Research 20(1): 122-129.
- Fitzpatrick, M.U. (1977) Vehicle integration and evaluation of advanced restraint systems - restraint systems analyses. Final Report DOT HS 803 343.
- Fitzpatrick, M. and Egbert, T. (1975) Inflatable seat belt development for subcompact car passengers. Final Report DOT HS 801 719.
- Forman, J.L., Lopez-Valdes, F.J., Dennis, N., Kent, R.W., Tanji, H., and Higuchi, K. (2010) An inflatable seat belt system in the rear seat occupant environment: Investigating the feasibility and benefit in frontal impact sled tests with a 50th percentile male ATD. Annals of Advances in Automotive Medicine 54: 111-126.
- Forman, J.L., Segui-Gomez, M., Ash, J.H., Lopez-Valdes, F.J. (2011) Child posture and shoulder belt fit during extended night-time traveling: An in-transit observational study. Annals of the Advances of Automotive Medicine 55: 3-14.
- Geddes, L.A. and Roeder, R.A. (2005) Evolution of our knowledge of sudden death due to Commotio Cordis. Am J of Emerg Med 23: 67-75.
- GHSA - Governors' Highway Safety Assoc (2012) http://www.ghsa.org/html/stateinfo/laws/childsafety_laws.html, accessed June 12, 2012.
- Hammer, D.R., McClenathan, R.V., and Karigiri, S.S. (1999) Performance requirements for an inflatable seatbelt assembly. SAE Technical Paper Number 1999-01-3222.
- Hardy, W. N., Foster, C., Mason, M., Yang, K., King, A., and Tashman, S. (2001) Investigation of head injury mechanism using neutral density technology and high-speed biplanar X-ray. Stapp Car Crash Journal 45: 337-368.
- Horsch, J.D., Horn, G. and McCleary, J.D. (1991) Investigation of inflatable seat belt restraints. Proc. 35th Stapp Car Crash Conference, pp. SAE Technical Paper Number 912905.
- Humanetics Innovative Systems (2013) CRABI 12-month-old dummy data sheet. http://www.humaneticsatd.com/crash-test-dummies/children/crabi-12-month-old, accessed September 2013.
- Irwin, A.L. and Mertz, H.J. (1997) Biomechanical basis for the CRABI and Hybrid III child dummies. Proc. 41st Stapp Car Crash Conference SAE Technical Paper 973317.
- Jakobsson, L., Bohman, K., Stockman, I., Andersson, M., and Osvalder, A-L. (2011) Older children's sitting postures when riding in the rear seat. Proc. 55th IRCOBI Conference, pp. 137-148.
- Janda, D.H., Viano, D.C., Andrzejak, D.V., and Hensinger, R.N. (1992) An analysis of preventive methods for baseball-induced chest impact injuries. Clinical J of Sports Medicine 2: 172-179.
- Janda, D.H., Bir, C.A., Viano, D.C., and Cassatta, S.J. (1998) Blunt chest impacts: Assessing the relative risk of fatal cardiac injury from various baseballs. J Trauma 44(2): 298-303.
- Karigiri, S.S., McClenathan, R.V., Kargol, J.A., and Shanmugavelu, I. (1999) Injury mitigating benefits of an inflatable shoulder belt for seat-integrated application. SAE Technical Paper Number 1999-01-0085.
- Kahane, Charles J. (2000) Fatality reduction by safety belts for front-seat occupants of cars and light trucks: Updated and Expanded estimates based on 1986-99 FARS data. NHTSA Report DOT HS 809 199.
- Kahane, Charles J. (2004) Lives saved by the Federal Motor Vehicle Safety Standards and other vehicle safety technologies, 1960-2002 - Passenger cars and light trucks - with a review of 19 FMVSS and their effectiveness in reducing fatalities, injuries and crashes. NHTSA Report DOT HS 809 833.
- Kang Y.-S., Moorhouse K., Bolte IV, J.H. (2011) Measurement of six degrees of freedom head kinematics in impact conditions employing six accelerometers and three angular rate sensors (6aω configuration). Journal of Biomechanical Engineering 133: Paper 111007-1.
- Kent, R.W., Henary, B., and Matsuoka, F. (2005) On the fatal crash experience of older drivers. Proc. Association for the Advancement of Automotive Medicine 49: 371-391.
- Kent, R.W., Lopez-Valdes, F.J., Dennis, N.J., Lessley, D., Forman, J., Higuchi, K., Tanji, H., Ato, T., Kameyoshi, H., and Arbogast, K. (2011) Assessment of a three-point restraint system with a pre-tensioned lap belt and an inflatable, force-limited shoulder belt Stapp Car Crash Journal 55: 141-159.
- Kroell, C.K., Allen, S.D., Warner, C.Y., Perl, T.R. (1986) Interrelationship of velocity and chest compression in blunt thoracic impact to Swine II. Proc. 30th Stapp Car Crash Conference, SAE Technical Paper 861881.
- Kumaresan S., Yoganandan, N., and Pintar F.A. (1997) Age-Specific Pediatric Cervical Spine Biomechanical Responses. Proc. 41st Stapp Car Crash Conference, pp. 31-61.
- Kumaresan S., Yoganandan, N., and Pintar F.A., Maiman, D., and Kuppa, S. (2000) Biomechanical study of pediatric human cervical spine: A finite element approach. J. Biomechanical Engineering - Transactions of ASME 122: 60-71.
- Link, M.S. (2003) Mechanically induced sudden death in chest wall impact (Commotio Cordis). Prog. in Biophysics and Molecular Biology 82: 175-186.
- Link, M.S., Bir, C.A., Dau, N., Madias, C., Estes III, N.A.M., Maron, B.J. (2008) Protecting our children from the consequences of chest blows on the playing field: A time for science over marketing. Pediatrics 122(2): 873-877.
- Link, M.S., Ginsburg, S.H., Wang, P.J., Kirchhoffer, J.B., Berul, C.I., Estes III, N.A.M., and Paris, Y.M. (1998) Commotio Cordis: Cardiovascular manifestations of a rare survivor. Chest 114: 326-328.
- Link, M.S., Maron, B.J., VanderBrink, B.A., Takeuchi, M., Pandian, N.G., Wang, P.J., Estes III, N.A.M. (2001) Impact directly over the cardiac silhouette is necessary to produce ventricular fibrillation in an experimental model of Commotio Cordis. J Am Coll Cardiology (JACC) 37(2): 649-654.
- Link, M.S., Maron, B.J., Wang, P.J., Pandian, N.G., VanderBrink, B.A., and Estes III, N.A.M. (2002) Reduced risk of sudden death from chest wall blows (Commotio Cordis) with safety baseballs. Pediatrics 109(5): 873-877.
- Link, M.S., Maron, B.J., Wang, P.J., et al (2003) Upper and lower limits of vulnerability to sudden arrhythmic death with chest wall impact (Commotio Cordis)”, J Am Coll Cardiology (JACC) 41(1): 99-104.
- Link, M.S., Wang, P.J., Pandian, N.G., et al. (1998a) A biological model of Commotio Cordis: Sudden death from low energy chest wall impact. J Am Coll Cardiology (JACC) Abstract 410-2.
- Link, M.S., Wang, P.J., Pandian, N.G., et al. (1998b) Resuscitation in a biological model of Commotio Cordis: Sudden death from low energy chest wall impact. J Am Coll Cardiology (JACC) Abstract 910-2.
- Link, M.S., Wang, P.J., Pandian, N.G., et al. (1998c) Safety baseballs reduce ventricular fibrillation and EKG changes in a biological model of Commotio Cordis: Sudden death from low energy chest wall impact. J Am Coll Cardiology (JACC) Abstract 1055-74.
- Madias, C., Maron, B.J., Alsheik-Ali, A.A., Estes III, N.A.M., and Link, M.S. (2007) Commotio Cordis. Indian Pacing and Electrophysiology Journal 7(4): 235-245.
- Maron, B.J., Estes III, N.A.M., Link, M.S. (2005) Task Force 11: Commotio Cordis. J Am Coll Cardiology (JACC) 45(8): 1371-3.
- Maron, B.J., Gohman, T.E., Kyle, S.B., Estes III, N.A.M., Link, M.S. (2002) Evidence against the efficacy of current chest wall protection for sudden death due to precordial blows (Commotio Cordis). J Am Coll Cardiology (JACC) Abstract 1091-118A.
- McCrory, P. (2002) Commotio Cordis. Br J Sports Med 36: 236-237.
- Mertz, H.J. (2002) Anthropomorphic Test Devices. In Accidental Injury: Biomechanics & Prevention (Second Edition), ed. Nahum A.M. and Melvin J.W., pp. 72-88. Springer-Verlag, New York.
- Mertz, H.J., Irwin, A.L., and Prasad, P.P. (2003) Biomechanical and scaling bases for frontal and side impact Injury Assessment Reference Values. Stapp Car Crash Journal 47: 155-188.
- Michaelson, J., Forman, J., Kent, R.W., and Kuppa, S. (2008) Rear seat occupant safety: Kinematics and injury of PMHS restrained by a standard 3-point belt in frontal crashes. Stapp Car Crash Journal 52: 295-325.
- Nakhla, S. (2002) Benefits of inflatable seat belts in reducing serious injury to vehicle occupants during crashes. Airbag 2002.
- Penning, L. (1979) Normal movements of the cervical spine. Am. J. Roentgenology 130: 317-326.
- Pincemaille, Y., Trosseille, X., Mack, P., Tarriere, C., Breton, F., and Renault, B. (1989) Some new data related to human tolerance obtained from volunteer boxers. Proc. 33rd Stapp Car Crash Conference, SAE Technical Paper 892435.
- Pintar, F.A., Mayer, R., Yoganandan, N., and Sun, E. (2000) Child neck strength characteristics using an animal model. Stapp Car Crash Journal 44: 77-83.
- Prasad, P. and Daniel, R.P. (1984) A biomechanical analysis of head, neck and torso injuries to child surrogates due to sudden torso acceleration. Proc. 28th Stapp Car Crash Conference, SAE Technical Paper 841656.
- Rouhana. S.W., Bedewi, P.G., Kankanala, S.V., Prasad, P., Zwolinski, J.J., Meduvsky, A.G., Rupp, J.D., Jeffreys, T.A., Schneider, L.W. (2003) Biomechanics of 4-point seat belt systems in frontal impacts. Stapp Car Crash Journal 47: 367-399.
- Rouhana, S.W., Kankanala S.V., Prasad, P., Rupp, J.D., Jeffreys, T.A., Schneider, L.W. (2006) Biomechanics of 4-point seat belt systems in farside impacts. Stapp Car Crash Journal 50: 267-298.
- Rowson, S. and Duma, S.M. (2013) Brain injury prediction: Assessing the combined probability of concussion using linear and rotational head acceleration. Annals of Biomedical Engineering 41(5): 873-882.
- Rutzki (nee Wilke), E. (1972) Safety Belts. United States Patent No. 3,682,498, Granted August 8, 1972.
- SAE International (1995) SAE J211-1 Instrumentation for Impact Test - Electronic Instrumentation.
- SAE International (2010) SAE J1727 Calculation Guidelines for Impact Testing.
- Sander, V. and Unger, T. (2011) Actual restraint systems: Reached their limits!? Proc. 22nd International Technical Conference on the Enhanced Safety of Vehicles, Paper No. 11-0351, Washington, DC, USA.
- Schneider, D. (2001) Communication from BF Goodrich and Autoliv.
- Schneider, L.W., Robbins, D.H., Pflug, M.A., and Snyder, R.G. (1983) Development of anthropometrically-based design specifications for an advanced adult anthropomorphic dummy family. NHTSA Final Report, DTNH22-80-C-07502.
- Sforza, C., Grassi, G., Fragnito, N., Turci, M., and Ferrario, V.F. (2002) Three-dimensional analysis of active head and cervical spine range of motion: Effect of age in healthy male subjects. Clinical Biomechanics 17(8): 611-614.
- Side Airbag Out-of-Position Injury Technical Working Group (2003) Recommended procedures for evaluating occupant injury risk from deploying side airbags. Available at www.IIHS.org.
- Stalnaker, R.L. (1993) Inconsistencies in state laws and federal regulations regarding child restraint use in automobiles. SAE Technical Paper 933087.
- Strother, C.E. and Morgan, R. M. (1974) The efforts of the National Highway Traffic Administration in the development of advanced passive protection systems and child restraint systems. SAE Technical Paper Number 740580.
- Sundararajan, S., Rouhana, S.W., Board, D., DeSmet, E., Prasad, P., Rupp, J.D., Miller, C.S., and Schneider, L.W. (2011) Biomechanical assessment of a rear-seat inflatable seatbelt in frontal impacts. Stapp Car Crash Journal 55: 161-197.
- Terry, Sydney L. and Batchelor, Robert B. (1969) Inflatable Cushioning Device. United States Patent No. 3,430,979, Granted March 4, 1969.
- Valani, R., Mikrogianakis, A., and Goldman, R.D. (2004) Cardiac concussion (Commotio Cordis). Can J Emerg Med 6(6): 428-30.
- Viano, D.C., Andrzejak, D.V., and King, A.I. (1992a) Fatal chest injury by baseball impact in children: A brief review. Clinical J Sports Medicine 2: 161-165.
- Viano, D.C., Andrzejak, D.V., Polley, T.Z., and King, A.I. (1992b) Mechanism of fatal chest injury by baseball impact: Development of an experimental model. Clinical J Sports Medicine 2: 166-171.
- Viano, D.C., Bir, C., Cheney, A.K., and Janda, D.H. (2000) Prevention of Commotio Cordis in Baseball: An evaluation of chest protectors. J Trauma 49(6).
- Vrzal, P.D. (1975) Occupant Protection… Back to the Basics. SAE Technical Paper Number 750394.
- Walsh, M.J. (1976) Sled tests of three-point systems including air belt restraints. Final Report DOT HS 801 939.
- Weber, K. (2002) Child passenger protection In Accidental Injury: Biomechanics and Prevention, ed. Nahum A.M. and Melvin J.W., pp.523-549, Springer-Verlag, New York.
- Weinstock, J., Maron, B.J., Song, C., Mane, P.P., Estes III, N.A.M., and Link, M.S. (2006) Failure of commercially available chest wall protectors to prevent sudden cardiac death induced by chest wall blows in an experimental model of Commotio Cordis. Pediatrics 117(4): e1-e7.
- Yang, S., Hagiwara, S., Engelke, K., Dhillon, M.S., Guglielmi, G., Bendavid, B.A., Soejima, O., Nelson, D.L., and Genant, H.K. (1994) Radiographic absorptiometry for bone mineral measurement of the phalanges: Precision and accuracy study. Radiology 192: 857-859.
- Yoganandan, N., Stemper, B.D., Kaufman, B.A., and Pintar, F.A. (2008) Biomechanics of the pediatric spine. In Surgery of the Pediatric Spine, eds. Kim D.H., Betz R.R., Huhn S.L., and Newton P.O., pp 11-22, Thieme Medical Publications, New York, NY.
- Youdas, J.W., Garrett, T.R., Suman, V.J., Bogard, C.L., Hallman, H.O., and Carey, J.R. (1992) Normal range of motion of the cervical spine: An initial goniometric study. Physical Therapy 72(11) 770-780.
- Zhang, L., Yang, K.H., and King, A.I. (2004) A proposed injury threshold for mild traumatic brain injury. J. Biomechanical Engineering - Transactions of the ASME 126: 226-236.