Microscopic observations of needle and soft-tissue simulant interactions

Alex Jahya, Sarthak Misra

    Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademic

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    Currently, physicians have no means of correctly estimating the needle tip location during percutaneous needle insertion. A model of needle-tissue interaction that predicts the needle tip location would assist physicians in pre-operative planning and hence improve needle targeting accuracy. This study is aimed to investigate the interactions of bevel-tipped needles and soft tissue in situ, using agarose gel as a soft-tissue simulant. An experimental setup is designed to record the needle-gel interaction forces and torques during needle insertion. Gel rupture during needle insertion is observed using a Laser Scanning Confocal Microscope and recorded in time series and three-dimensional images (Figure). Experimental results show the possibility of observing in situ gel rupture during needle insertion and relating them to the needle-gel interaction forces and torques. Moreover, it is seen that the maximum force along the insertion axis, |Fz max|, is proportional to bevel angle and inversely proportional to insertion speed. The maximum resultant torque, ||Tr max||, is found to be inversely proportional to bevel angle and proportional to insertion speed. However, the influence of the increase in insertion speed in |Fz max| and ||Tr max|| diminishes as insertion speed increases. These results concur with observations noted in gel rupture images.
    Original languageUndefined
    Title of host publication23rd Congress of the International Society of Biomechanics
    Place of PublicationBrussel, Belgium
    PublisherInternational Society of Biomechanics
    Number of pages2
    ISBN (Print)not assigned
    Publication statusPublished - 3 Jul 2011
    EventXXIII Congress of the International Society of Biomechanics, ISB 2011 - Brussel, Belgium
    Duration: 3 Jul 20117 Jul 2011
    Conference number: 23

    Publication series

    PublisherInternational Society of Biomechanics


    ConferenceXXIII Congress of the International Society of Biomechanics, ISB 2011
    Abbreviated titleISB 2011


    • METIS-289630
    • Needle
    • EWI-20726
    • IR-80781
    • CE-Advanced Robotics
    • Fracture

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