Apparatus and a method for the provision of topical negative pressure therapy to a wound site are described, the apparatus comprising: vacuum generating means for generating a negative pressure at said wound site said vacuum generating means being operably connected to a dressing at said wound site by aspiration conduit means； pressure sensing conduit means in fluid communication with said aspiration conduit means at a junction adjacent said dressing； first pressure sensing means between said junction and said vacuum generating means； second pressure sensing means operably associated with said pressure sensing conduit means； diagnostic means in communication with said first and second pressure sensing means； and control means in communication with said diagnostic means for controlling pressure in said aspiration and said pressure sensing conduit means.
