Fig. 4

Simulation of gel filling into the microfluidic device for different designs (a) Movement of collagen solution with leakage to media channel of the design number 1; (b) Movement of collagen solution without leakage along the gel channel of the design number 2; (c) Movement of collagen solution without leakage along the gel channel of the design number 3; (d) Movement of collagen solution with leakage to media channel of the design number 4; The dynamic viscosity of the collagen solution with a concentration of 2.0 mg/mL is 6 mPa × s ⁴⁵.