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Flexural and torsional rigidity of colonoscope at room and body temperatures

Hellier, David, Albermani, Faris, Evans, Brendon, de Visser, Hans, Adam, Clayton J., Passenger, Joshua D., & , (2011) Flexural and torsional rigidity of colonoscope at room and body temperatures. Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine, 225(4), pp. 389-399.

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Abstract

A series of experiments have been conducted to determine the flexural, EI, and torsional, GJ, rigidity of an Olympus colonoscope CF‐140S and torsional rigidity of a Pentax colonoscope EC‐3870 and the dependency of these properties on temperature and on the presence of loops. Along the length of the colonoscope, the Olympus colonoscope flexural rigidity varied between 260 and 400 Ncm2 and torsional rigidity varied between 68 and 88 Ncm2/deg, with an average of 76 Ncm2/deg for tests involving 0.86 Nm of anti‐clockwise torque. Results show a significant decrease of 10% in torsional rigidity between clockwise and anti‐clockwise torque. For the Pentax colonoscope flexural rigidity was not tested; its torsional rigidity varied between 34 and 76 Ncm2/deg, with an average of 46 Ncm2/deg for tests involving 0.43 Nm of anti‐clockwise torque. An increase in temperature of the Olympus colonoscope from 24°C to 37°C reduces EI by an average of 17% and GJ by an average of 7%. A right‐handed loop caused a significant increase in flexural rigidity, but other looping configurations had no significant influence.

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3 citations in Scopus
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4 citations in Web of Science®

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ID Code: 42392
Item Type: Journal Article
Keywords: torsional rigidity, flexural rigidity, colonoscope mechanical properties, effect of temperature on mechanical properties, colonoscope
DOI: 10.1177/09544119JEIM883
ISSN: 0954-4119
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > BIOMEDICAL ENGINEERING (090300) > Biomechanical Engineering (090302)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Current > Institutes > Institute of Health and Biomedical Innovation
Past > Schools > School of Engineering Systems
Copyright Owner: Copyright 2011 Sage Publications Ltd.
Deposited On: 19 Sep 2011 09:16
Last Modified: 20 Sep 2011 05:20

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