Leak detection in negative pressure wound therapy system

An apparatus for applying negative pressure wound therapy to a wound, the apparatus comprising:

• a housing comprising a source of negative pressure configured to be in fluidic communication with a wound dressing via a fluid flow path, the source of negative pressure configured to aspirate fluid from the wound;
• a pressure sensor configured to measure a pressure in the fluid flow path;
• and
• a controller programmed to operate the source of negative pressure, the controller further programmed to:
• within a set period of time following initiation of the negative pressure wound therapy,
• determine a rate of flow in the fluid flow path from a plurality of readings indicative of activity of the source of negative pressure;
• determine a rate threshold from a pressure setpoint for the source of negative pressure;
• detect that the fluid flow path is sealed in response to (i) the rate of flow in the fluid flow path not satisfying the rate threshold and (ii) the pressure in the fluid flow path satisfying a pressure threshold;
• and
• in response to detecting that the fluid flow path is sealed, provide an indication that the fluid flow path is sealed.