Blood pump controller and ventricular assist system

A blood pump controller configured to control a blood pump which takes a blood into a pump chamber and supplies the blood taken into the pump chamber into a body of a user by a blood supply mechanism, the blood pump controller comprising:

• a controller body connected to the blood pump by way of a drive cable and configured to drive the blood pump;
• a battery pack configured to store electricity and to supply stored electricity to the controller body;
• and
• a battery housing body having a slot in which the battery pack is housed and held, wherein
• the controller body and the battery housing body are connected to each other by a given connection cable,
• the battery pack has at least a first surface on which an electricity-supply-side battery connection connector is disposed,
• the slot has at least a second surface on which an electricity-receiving-side battery connection connector is disposed,
• the battery pack and the battery housing body are configured such that, in a state where the battery pack is housed in the slot, an electrical connection is made between the electricity-supply-side battery connection connector and the electricity-receiving-side battery connection connector which form a pair of battery connection connectors, and the first surface and the second surface opposedly face each other,
• a first sealing member is attached to at least either one of the first surface or the second surface and is configured to provide sealing such that the first sealing member entirely surrounds and seals the pair of battery connection connectors in a state where the battery pack is housed in the slot and the first surface and the second surface opposedly face each other, and
• the first sealing member is formed of a first waterproof packing.