An adaptive finite element model for steerable needles.

Biomechanics and Modeling in Mechanobiology
Michele TerzanoMatthew Oldfield

Abstract

Penetration of a flexible and steerable needle into a soft target material is a complex problem to be modelled, involving several mechanical challenges. In the present paper, an adaptive finite element algorithm is developed to simulate the penetration of a steerable needle in brain-like gelatine material, where the penetration path is not predetermined. The geometry of the needle tip induces asymmetric tractions along the tool-substrate frictional interfaces, generating a bending action on the needle in addition to combined normal and shear loading in the region where fracture takes place during penetration. The fracture process is described by a cohesive zone model, and the direction of crack propagation is determined by the distribution of strain energy density in the tissue surrounding the tip. Simulation results of deep needle penetration for a programmable bevel-tip needle design, where steering can be controlled by changing the offset between interlocked needle segments, are mainly discussed in terms of penetration force versus displacement along with a detailed description of the needle tip trajectories. It is shown that such results are strongly dependent on the relative stiffness of needle and tissue and on the tip of...Continue Reading

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Citations

Apr 26, 2021·Journal of the Mechanical Behavior of Biomedical Materials·M TerzanoA E Forte

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Software Mentioned

DistMesh
MATLAB
qquad
SIMULIA

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