Abstract: Disclosed herein is a patient interface for wound treatment and/or management, comprising: an interface body configurable to substantially or at least partially surround a wound, the interface body comprising a gas inlet and defining a first gas flow path having a first flow resistance, and a second gas flow path having a second flow resistance. The first gas flow path is arranged in fluid communication with the gas inlet and the second gas flow path. The interface body comprises or is configurable to provide a gas outlet at or adjacent to the wound site.

Abstract: Disclosed herein is an obturator and/or cannula configured for insertion of a trocar assembly into a surgical cavity and allowing insertion of medical instruments into the surgical cavity through the cannula after removal of the obturator. The cannula can include an obturator for use in a trocar assembly. A trocar assembly is disclosed including a cannula having a shaft, optionally with a lumen, and one or more elements protruding outwardly from a surface of the lumen and an obturator. The obturator can comprise a shaft with one or more portions configured to accommodate the one or more elements protruding from the lumen surface when the obturator shaft is located in the lumen of the cannula.