Humidification chamber for a respiratory assistance apparatus

A respiratory assistance device configured to provide a heated and humidified gases stream, comprising:

• a device gases inlet configured to receive a supply of gases;
• a blower configured to generate a pressurised gases stream from the supply of gases;
• a humidifier configured to heat and humidify the pressurised gases stream;
• a device gases outlet for the heated and humidified gases stream;
• and
• a flow path for the gases stream through the respiratory device from the device gases inlet through the blower unit and humidification unit to the device gases outlet,
• and wherein the humidifier is configured to receive and retain a removable humidification chamber for humidifying gases, comprising:
• a water tub that is configured to receive a volume of water, wherein the water tub comprises a base and a perimeter wall,
• a heater plate, wherein the heater plate is exposed through an aperture in a base surface of the water tub, and wherein the base of the water tub overlaps a portion of the heater plate such that a portion of an underside of the base surface is thermally insulated from the heater plate;
• a lid configured to engage the water tub for enclosing the water tub to define the interior volume of the humidification chamber,
• one or more clips for securing the lid in a closed position,
• a gases inlet for receiving a flow of gases into the interior volume of the humidification chamber,
• a gases outlet through which a humidified flow of gases may exit the interior volume of the humidification chamber, and
• wherein the water tub is rigid plastic and the heater plate is metallic, and wherein the underside of the base surface of the water tub comprises a rigid plastic portion and an exposed metallic portion of the heater plate.