Table 1.

Summary of the design goals for each prototype. Five early prototypes were designed and constructed to iteratively minimize the pump size and improve fluid dynamic performance. Various geometric parameters and magnetic coupling configurations were tested.

Prototype	Design goal
1	Demonstrate magnetic coupling arrangements with different impeller geometries at 3x scale including alternating vs continuous polarities, axial vs radial polarities, cylindrical vs tubular orientations, and bar vs arc segments. Prototype 1 measured 20 mm in diameter.
2	Demonstrate magnetic coupling bar magnet configuration with the proximal impeller blade configuration and the distal blade configuration at 2x scale. Prototype 2 measured 14 mm in diameter.
3	Demonstrate magnetic coupling with four radially-polarized 1 mm arc magnets at miniaturized scale. Prototype 3 measured 8 mm in diameter.
4	Improve rheological signature with re-designed axial outlet and integrated diffusor to provide increased forward flow of fluid by increasing the pressure generated.
5	Improve rheological signature with integrated diffusor combined with outlet flow straightener to provide better axial flow and inducer to properly stabilize impeller.