Jamming of fingers: an experimental study to determine force and deflection in participants and human cadaver specimens for development of a new bionic test device for validation of power-operated motor vehicle side door windows
The deformability of human fingers is central to addressing the real-life hazard of finger jamming between the window and seal entry of a power-operated motor vehicle side door window. The index and little fingers of the left hand of 109 participants and of 20 cadaver specimens were placed in a measurement setup. Participants progressively jammed their fingers at five different dorsal-palmar jam positions up to the maximum tolerable pain threshold, whereas the cadaver specimens were jammed up to the maximum possible deflection. Force-deflection curves were calculated corresponding to increasing deflection of the compressed tissue layers of the fingers. The average maximum force applied by the participants was 42 N to the index finger and 35 N to the little finger. In the cadaver fingers, the average of the maximum force applied was 1886 N for the index finger and 1833 N for the little finger. In 200 jam positions, 25 fractures were observed on radiographs; fractures occurred at an average force of 1485 N. These data assisted the development of a prototype of a bionic test device for more realistic validation of power-operated motor vehicle windows.
Amtsblatt der Europäischen Gemeinschaft. Änderung der Richtlinie 74/60/EWG des Rates zur Angleichung der Rechtsvorschriften der Mitgliedstaaten über die Innenausstattung der Kraftfahrzeuge. 2000. L87/22.
Hohendorff B, Weidermann C, Burkhart KJ, Rommens PM, Prommersberger KJ, Konerding MA. Lengths, girths, and diameters of child fingers from the age of 3 to 10 years. Ann Anat 2010; 192: 156–161.
Hohendorff B, Weidermann C, Pollinger P, et al. Entrapment of adult fingers between window glass and seal entry of a motor vehicle side door: an experimental study for investigation of the force at the subjective pain threshold. J Biomech 2011; 44: 2158–2161.
Hohendorff B, Weidermann C, Pollinger P, et al. Finger injuries caused by power-operated windows of motor vehicles: an experimental cadaver study. Injury 2012; 43: 903–907.
Hohendorff B, Weidermann C, Pollinger P, Burkhart KJ, Prommersberger KJ, Müller LP. Einklemmung eines Kinderfingers: Eine experimentelle Studie zur Bestimmung der elastischen Widerstände und der Punkte des Beginns der Knochen-/Gelenkdeformierung. Handchir Mikrochir Plast Chir 2012; 44: 1–4.
Hohendorff B, Weidermann C, Pollinger P, et al. Verletzungsrisiko von Kinderfingern in automatischen Scheibenschließanlagen von Kraftfahrzeugen. Unfallchirurg 2012; 26 [Epub ahead of print], DOI: 10.1007/s00113-011-2150-3.
Kent R, Stacey S, Parenteau C. Dynamic pinch tolerance of the phalanges and interphalangeal joints. Traffic Inj Prev. 2008; 9: 83–88.
National Consumer Affairs Center of Japan. NCAC News 2010; Vol. 22 No. 3.
National Highway Traffic Safety Administration. Federal motor vehicle safety standards and regulations, standard no. 118, power-operated window, partition, and roof panel systems. Title 49 of the Code of Federal Regulations, Part 571.118.
National Highway Traffic Safety Administration, National Center for Statistics and Analysis. Not-in-traffic surveillance 2007 – highlights. DOT HS 811 085. 2009.
Paridon HM, Mauser DM. Safeguarding of pinch and shear points on power windows by limitation of the closing velocity: a pilot study. Saf Sci 2006; 44: 197–207.
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