Apparatus for topical negative pressure therapy

Apparatus for the provision of topical negative pressure therapy to a wound site, the apparatus comprising:

• a wound dressing configured to cover and seal the wound site;
• an aspiration lumen;
• a pressure sensing lumen;
• a negative pressure source configured to provide negative pressure to the wound dressing via the aspiration lumen;
• a junction positioned adjacent to the wound dressing, the junction configured to fluidically connect the aspiration lumen and the pressure sensing lumen;
• a first pressure sensor positioned along the aspiration lumen between the junction and the negative pressure source;
• a second pressure sensor positioned along the pressure sensing lumen;
• a valve in fluid communication with the pressure sensing lumen;
• and
• a controller configured to, based on signals received from the first and second pressure sensors, perform at least one of:
• detect a blockage in the aspiration lumen, clear the blockage in the aspiration lumen, and detect a leakage in a fluid flow path, wherein the fluid flow path comprises the wound dressing, the negative pressure source, the aspiration lumen, and the pressure sensing lumen,
• wherein the controller is further configured to:
• detect the blockage in the aspiration lumen based on comparison of a pressure difference between pressure sensed by the first pressure sensor and pressure sensed by the second pressure sensor with a pressure difference threshold;
• open the valve in response to detecting the blockage;
• close the valve if the pressure difference falls to substantially zero after expiration of a first time interval;
• and
• activate a blockage alarm if the pressure difference does not fall to substantially zero after expiration of a second time interval, the blockage alarm configured to indicate a blockage in the fluid flow path.