Abstract: A device for delivering gas into a surgical cavity comprising a patient interface having an inlet, fluidly connected with a gas source, and an outlet, the patient interface being configured to deliver a conditioned flow of gas into the surgical cavity. The conditioned flow of gas may have the properties of having a reduced outlet velocity relative to the velocity of the inlet gas, or having a diffuse flow, or being heated, or being substantially laminar or non-turbulent, or a combination thereof. The invention may also comprise an attachment mechanism to attach to or anchor the patient interface.

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.