Biomedical Engineering Reference
In-Depth Information
Chapter 4
Respect for Tissue Representation
Using Photoelastic Stress Analysis for
Endovascular Surgery Simulation
Silicone vasculature was presented in previous chapters for
endovascular surgery simulation and built relying on the tomogram
of human vasculature, and human arterial lumen was recreated in
silicone with 13
N
m of accuracy. Major vasculature models were
built and integrated in the endovascular evaluator EVE. This silicone
vasculature allows low circulation and a maximum pressure of
200
mmHg, enabling practice of endovascular tools deployment in
models simulating diseased vasculature (Fig. 4.1a). It is of particular
interest for endovascular surgery research, medical training and
endovascular tools industry to develop sensing technologies for
quantitative evaluation of interaction between intravascular tools
and silicone vasculature, to enable the proiling of human skills
and device performance. For that purpose the use of photoelastic
effect for measuring the stress in walls of urethane vasculature was
proposed in 2005 [1]. Polarized light undergoes a phase shift when
passing through photoelastic materials producing birefringence (Fig.
4.1b). In this chapter we will present how to measure stress, morphology
changes, catheter shape and trajectory from photoelastic images during
endovascular surgery simulation. Micro force sensors placed on the
catheter tip [2] cannot replace photoelastic stress analysis as they modify
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