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. Author manuscript; available in PMC: 2013 Feb 1.
Published in final edited form as: Neuroimage. 2011 Sep 14;59(3):2423–2429. doi: 10.1016/j.neuroimage.2011.08.107

Figure 3. Performance of the stepped cannula model.

Figure 3

The model effectively restricted backflow to the 3 mm step length. (A) Comparison of the original backflow model (grey) to the stepped model (black) in a simulation with a typical flow rate of 2.5 μL/min. Without the step model, the backflow would have passed the step, contrary to experimental evidence. (B) All simulations found to have backflow larger than 3 mm in the original backflow model were restricted to 3 mm by increasing the effective shear modulus at the step.