A multimodal surgical gas delivery system comprising: - a fluid pump adapted and configured to circulate insufflation fluid through the system; - a supply conduit in fluid communication with an output of the fluid pump and configured and adapted for delivering pressurized insufflation fluid to an output port of a control unit (210; 310); - a return conduit in fluid communication with an input of the fluid pump for delivering insufflation fluid to the fluid pump and configured and adapted for returning insufflation fluid to an input port of the control unit ; - an adjustable back-pressure control valve in fluid communication with the supply conduit and the return conduit , the back-pressure control valve being adapted and configured to respond to a supply conduit pressure exceeding a set pressure by opening and directing fluid from the supply conduit to the return conduit ; - an insufflation control for controlling addition of insufflation fluid into the system, from an insufflation gas source ; - an insufflation conduit for delivering insufflation gas to the system from the insufflation control ; - a control panel configured and adapted to permit a user to select a mode of the multimodal surgical gas delivery system; - a conduit set , adapted and configured to connect to the supply, return and insufflation conduits , and to a plurality of surgical devices in fluid communication with the surgical cavity, - a pressure sensor , adapted and configured to sense pressure of a surgical cavity through the insufflation conduit ; and - a dump valve in fluid communication with the supply conduit adapted and configured to release fluid from the system when an over-pressure condition is sensed, characterized by a switching valve (295; 395) in connection with the supply, return and insufflation conduits , the switching valve (295; 395) being configured and adapted to divert the insufflation conduit between fluid connection with one or more of the surgical devices , and the return conduit to the fluid pump . - a fluid pump adapted and configured to circulate insufflation fluid through the system; - a supply conduit in fluid communication with an output of the fluid pump and configured and adapted for delivering pressurized insufflation fluid to an output port of a control unit (210; 310); - a return conduit in fluid communication with an input of the fluid pump for delivering insufflation fluid to the fluid pump and configured and adapted for returning insufflation fluid to an input port of the control unit ; - an adjustable back-pressure control valve in fluid communication with the supply conduit and the return conduit , the back-pressure control valve being adapted and configured to respond to a supply conduit pressure exceeding a set pressure by opening and directing fluid from the supply conduit to the return conduit ; - an insufflation control for controlling addition of insufflation fluid into the system, from an insufflation gas source ; - an insufflation conduit for delivering insufflation gas to the system from the insufflation control ; - a control panel configured and adapted to permit a user to select a mode of the multimodal surgical gas delivery system; - a conduit set , adapted and configured to connect to the supply, return and insufflation conduits , and to a plurality of surgical devices in fluid communication with the surgical cavity, - a pressure sensor , adapted and configured to sense pressure of a surgical cavity through the insufflation conduit ; and - a dump valve in fluid communication with the supply conduit adapted and configured to release fluid from the system when an over-pressure condition is sensed, <EOS>