Numerical analysis of the effects of a high gradient magnetic field on flowing erythrocytes in a membrane oxygenator

• Effects of a gradient magnetic field on erythrocytes in an oxygenator were analyzed.
• Blood changes magnetic susceptibility depending on if it is carrying oxygen or not.
• Oxygenation of deoxygenated blood is effective for pressure rise in a magnetic field.
• A membrane oxygenator works as an actuator.
• There is a possibility of self-circulation of blood through an oxygenator.

This study was carried out to clarify the effect of a high gradient magnetic field on pressure characteristics of blood in a hollow fiber membrane oxygenator in a solenoid coil by means of numerical analysis. Deoxygenated erythrocytes are paramagnetic, and oxygenated erythrocytes are diamagnetic. Blood changes its magnetic susceptibility depending on whether it is carrying oxygen or not. Motion of blood was analyzed by solving the continuous equation and the Navier–Stokes equation. It was confirmed that oxygenation of deoxygenated blood in the downstream side of the applied magnetic field was effective for pressure rise in a non-uniform magnetic field. The pressure rise was enhanced greatly by an increase in magnetic field intensity. The results suggest that a membrane oxygenator works as an actuator and there is a possibility of self-circulation of blood through an oxygenator in a non-uniform magnetic field.