Cooling cap assembly and cooling unit

A cooling cap assembly comprising:

• a flexible heat exchanger configured to remove heat from a scalp of a patient;
• a cooling unit fluidly coupled to the heat exchanger and configured to circulate fluid through the heat exchanger, the cooling unit comprising a controller configured to:
• determine a power source for the cooling unit;
• and
• select an operation state of the cooling unit based on the determined power source.

A method of controlling cooling of a scalp of a head of a chemotherapy patient comprising:

• applying a cooling cap assembly to the head, wherein the cooling cap assembly comprises a flexible heat exchanger;
• circulating a fluid through the heat exchanger using a cooling unit fluidly coupled to the heat exchanger, wherein the cooling unit comprises a plurality of operation states;
• determining a power source of the cooling unit;
• and
• selecting the operation state of the cooling unit based on the determined power source.