Increasing the velocity of needle insertion reduces the force of the rupture event and asymptotically minimizes rupture deformation and work in multilayered porcine cardiac tissue.
Does increasing needle insertion velocity reduce rupture force and tissue deformation in biological materials?
Increasing needle insertion velocity reduces rupture force and tissue deformation, which may improve control during needle-based procedures.
During needle-based procedures, transitions between tissue layers often lead to rupture events that involve large forces and tissue deformations and produce uncontrollable crack extensions. In this paper, the mechanics of these rupture events is described, and the effect of insertion velocity on needle force, tissue deformation, and needle work is analyzed. Using the J integral method from fracture mechanics, rupture events are modeled as sudden crack extensions that occur when the release rate J of strain energy concentrated at the tip of the crack exceeds the fracture toughness of the material. It is shown that increasing the velocity of needle insertion will reduce the force of the rupture event when it increases the energy release rate. A nonlinear viscoelastic Kelvin model is then used to predict the relationship between the deformation of tissue and the rupture force at different velocities. The model predicts that rupture deformation and work asymptotically approach minimum values as needle velocity increases. Consequently, most of the benefit of using a higher needle velocity can be achieved using a finite velocity that is inversely proportional to the relaxation time of the tissue. Experiments confirm the analytical predictions with multilayered porcine cardiac tissue.
Mahvash et al. (Mon,) conducted a other in Needle insertion mechanics. Increased needle insertion velocity vs. Lower needle insertion velocity was evaluated on Needle force, tissue deformation, and needle work during rupture events. Increasing the velocity of needle insertion reduces the force of the rupture event and asymptotically minimizes rupture deformation and work in multilayered porcine cardiac tissue.