Wound therapy system with blockage and leak detection

A wound therapy system comprising:

• a canister configured to contain fluid removed from a wound site;
• a conduit having a first end coupled to the canister and a second end operably coupled to the wound site, wherein an interior volume of the conduit is defined by a single lumen providing the only fluid path to the wound site;
• wherein an interior volume of the canister and the interior volume of the conduit define a negative pressure circuit;
• a pump fluidly operably coupled to the wound site via the conduit and configured to apply negative pressure to the wound site via the negative pressure circuit;
• a pressure indicator configured to indicate a pressure within the negative pressure circuit;
• and
• a controller configured to:
• store a baseline pressure decay curve from an external model including an estimated volume and leak rate equal to the negative pressure circuit and that is representative of an expected change in pressure within the negative pressure circuit from a first negative pressure to a predetermined threshold pressure over a first period of time;
• generate a second pressure decay curve by operating the pump to apply a second applied negative pressure equal to the first negative pressure to the negative pressure circuit and measuring a change in pressure over a second period of time within the negative pressure circuit during which the pressure within the negative pressure circuit increases from the second applied negative pressure to the threshold pressure;
• compare the second pressure decay curve to the baseline pressure decay curve;
• and
• generate an alert in response to detecting that a difference between the second pressure decay curve and the baseline pressure decay curve exceeds a predetermined first variance threshold.