Modeling and Simulation of Cutting in Soft Biological Tissues for Surgical Simulation

<p>Surgical simulation as a practice has gained popularity owing to the dexterityit can impart to the surgical interventions and planning. It is also extremelychallenging since it requires an accurate correlation to reality. The objective ofthis study is to develop computational tools that can simulate cutting in softbiological tissues and suggest a stress based criterion for predicting the onset offailure.</p><p>The cutting algorithm proposed in this study is based on the total Lagrangian explicit dynamics approach and gives due consideration to the nonlinearities associated with tissue-like materials, both geometric and material. Theconstitutive response of the tissue is modeled using a hyperelastic Neo-Hookeanmaterial and the dynamic equations of equilibrium are derived based on the total Lagrangian formulation. The equations of equilibrium are integrated usingthe central difference operator. The algorithm uses node snapping and edgerelocation procedures to align the edge of the element with the direction of cut.</p><p>The second part of the thesis focuses on determining a stress-based cuttingcriterion to mark the beginning of failure in the tissue. For a given set offorce-displacement data from experimental results reported in the literature onporcine liver, we construct finite element models using a commercially availablefinite element code to simulate the deformation field in the tissue. The aim is tofind the stress state in the tissue corresponding to that rupture displacement.A number of studies are performed to analyze the effect of parameters like thetool velocity, radius of the tool, on the reaction force and stress state in thetissue.</p>

Name thesis:degree_name

MS

Level thesis:degree_level

masters

Discipline thesis:degree_discipline

Engineering and Applied Science: Mechanical Engineering

Grantor dc:publisher

University of Cincinnati

Year dc:date

2012

Author dc:creator

• Mishra, Shikta

Contributors dc:contributor

• Vemaganti, Kumar

• Mechanics

Statement dc:rights

• unrestricted
• This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.

Language dc:language

English

Repository record dc:identifier

http://rave.ohiolink.edu/etdc/view?acc_num=ucin1352994028

OAI identifier oai:identifier

oai:etd.ohiolink.edu:ucin1352994028