A system for distending body tissue cavities of subjects by continuous flow irrigation during endoscopie procedures, the system including: a fluid source reservoir containing a non viscous physiologic fluid meant for cavity distension a fluid supply conduit tube connecting the fluid source reservoir to an inlet port of a variable speed positive displacement inflow pump and an outlet port of the said inflow pump being connectable to an inflow port of an endoscope instrument through an inflow tube for pumping the fluid at a controlled flow rate into the cavity, the flow rate of the said inflow pump being termed as the inflow rate an inflow pressure transducer being located anywhere in the inflow tube between the outlet port of the inflow pump and the inflow port of the endoscope an outflow port of the endoscope being connectable to a waste fluid collecting container via a waste fluid carrying tube, and characterized in that an active inflow pressure pulsation dampening means is connected to the inflow tube for dampening the pressure pulsations inside the cavity created by the positive displacement inflow pump.Cette invention concerne un système permettant de distendre des cavités de tissus corporels de sujets par irrigation à écoulement continu pendant des procédures endoscopiques, lequel système comprend: un réservoir dune source de fluide contenant un fluide physiologique non visqueux servant à distendre une cavité un tube damenée de fluide reliant le réservoir de source de fluide à un orifice dadmission dune pompe dadmission volumétrique à vitesse variable, un orifice dévacuation de ladite pompe dadmission pouvant être relié à un orifice dadmission dun instrument endoscopique par un tube dadmission en vue du pompage du fluide à un débit commandé dans la cavité, le débit de cette pompe dadmission étant appelé débit dadmission un transducteur de pression dadmission situé à un endroit quelconque dans le tube dadmission entre lorifice dévacuation de la pompe dadmission
