Refrigerant electromechanical control

A temperature regulation method for a balloon catheter, the method comprising supplying cryogenic fluid to a balloon of the balloon catheter in at least two phases, the at least two phases comprising a cooldown phase and a regulation phase subsequent to the cooldown phase,

• wherein the cooldown phase comprises:
• coupling a source of the cryogenic fluid to the balloon;
• delivering the cryogenic fluid to the balloon via a flow control valve to cool the balloon;
• obtaining one or more temperature measurements for the balloon;
• determining, using the one or more temperature measurements, that a temperature of the balloon satisfies a first predetermined condition;
• and,
• in response to the determining, closing the flow control valve;
• and,
• wherein the regulation phase comprises repeating the following steps:
• obtaining one or more further temperature measurements for the balloon;
• determining, using the one or more further temperature measurements, whether a temperature of the balloon satisfies a second predetermined condition;
• and,
• if the temperature of the balloon satisfies the second predetermined condition, opening the flow control valve to increase supply of the cryogenic fluid to the balloon.