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Biomedical Engineering / Biomedizinische Technik

Joint Journal of the German Society for Biomedical Engineering in VDE and the Austrian and Swiss Societies for Biomedical Engineering and the German Society of Biomaterials

Editor-in-Chief: Dössel, Olaf

Editorial Board: Augat, Peter / Habibović, Pamela / Haueisen, Jens / Jahnen-Dechent, Wilhelm / Jockenhoevel, Stefan / Knaup-Gregori, Petra / Lenarz, Thomas / Leonhardt, Steffen / Plank, Gernot / Radermacher, Klaus M. / Schkommodau, Erik / Stieglitz, Thomas / Boenick, Ulrich / Jaramaz, Branislav / Kraft, Marc / Lenthe, Harry / Lo, Benny / Mainardi, Luca / Micera, Silvestro / Penzel, Thomas / Robitzki, Andrea A. / Schaeffter, Tobias / Snedeker, Jess G. / Sörnmo, Leif / Sugano, Nobuhiko / Werner, Jürgen /


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1862-278X
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Volume 58, Issue 1

Issues

Volume 57 (2012)

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

Bernd Hohendorff
  • Corresponding author
  • Elbe Clinic Stade Buxtehude, Department of Handsurgery, Aesthetics and Plastic Surgery, Bremervörder Straße 111, D-21682 Stade, Germany
  • Email
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Christian Weidermann
  • Ilmenau University of Technology, Faculty of Mechanical Engineering, Institute of Thermodynamics and Fluid Mechanics, Helmholtzring 1, D-98684 Ilmenau, Germany
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Philipp Pollinger
  • University of Applied Sciences Coburg, Department of Mechanical Engineering, Automotive Technology andManagement, Mechatronics, Friedrich-Streib-Straße 2, D-96450 Coburg, Germany
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  • De Gruyter OnlineGoogle Scholar
/ Klaus J. Burkhart
  • Department of Trauma, Hand and Elbow Surgery, Centre for Orthopaedic and Trauma Surgery, University Medical Center Cologne, Kerpener Straße 62, D-50937 Köln, Germany
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  • De Gruyter OnlineGoogle Scholar
/ Lars Peter Müller
  • Department of Trauma, Hand and Elbow Surgery, Centre for Orthopaedic and Trauma Surgery, University Medical Center Cologne, Kerpener Straße 62, D-50937 Köln, Germany
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  • De Gruyter OnlineGoogle Scholar
Published Online: 2012-12-12 | DOI: https://doi.org/10.1515/bmt-2012-0004

Abstract

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.

Keywords: Finger; force-deflection curve; jamming; power-operated window

References

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About the article

Corresponding author: Bernd Hohendorff, Elbe Clinic Stade Buxtehude, Department of Handsurgery, Aesthetics and Plastic Surgery, Bremervörder Straße 111, D-21682 Stade, Germany, Phone: +49-(0) 4141-97-2897, Fax: +49-(0) 4141-97-2917


Received: 2012-08-16

Accepted: 2012-11-26

Published Online: 2012-12-12

Published in Print: 2013-02-01


Citation Information: Biomedizinische Technik/Biomedical Engineering, Volume 58, Issue 1, Pages 39–49, ISSN (Online) 1862-278X, ISSN (Print) 0013-5585, DOI: https://doi.org/10.1515/bmt-2012-0004.

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