Electrophoresis apparatus and pump

Regardless of the individual difference of the pump to fill the electrophoresis medium in a capillary to allow removal of the air bubbles. Of the flow path formed between the inner surface and the plunger side of the container in which the electrophoretic medium is accommodated, a cross-sectional area of ​​the easy flow path side in the electrophoresis medium flow occurs stagnation, on the opposite side flow path of It formed to be wider than the cross-sectional area. That is, formed so as to increase the flow rate of the electrophoretic medium in an easy channel section occur stagnation. Thus, the flow of the electrophoresis medium can be eliminated extremely small area in the pump.