A mains electricity (AC-powered) device designed to treat hard-to-heal open wounds (e.g., acute, traumatic, and chronic) using suction combined with instillation/aspiration of wound treatment solutions (e.g., saline) over the wound bed. It typically includes controls and a user-interface to vary negative pressure and irrigation parameters, tubing, and a collection receptacle. It is intended to reduce oedema, promote granulation tissue formation, and remove exudates and infectious material.