Disclosed is a system for delivering insufflation gas to a patient's body cavity during an endoscopic surgical procedure, the system comprising a system having a flow rate through a flow passage in communication with a pneumatically sealed trocar that prevents over-pressure in the body cavity. An insufflation conduit for delivering a continuous flow of insufflation gas to the body cavity, and an insufflation device for driving the gas flow through the insufflation conduit at a driving pressure, the system passing through the insufflation conduit Either the gas flow rate or the drive pressure required to maintain a particular flow rate can be configured to vary with body cavity pressure. [Selection diagram] Fig. 1内視鏡外科処置の間に患者の体腔に送気ガスを送達するためのシステムが開示され、該システムは、体腔の過圧を防ぐ空気圧封止されたトロカールと連通する流路を通してある流量で体腔に送気ガスの連続的な流れを送達するための送気導管と、駆動圧力で送気導管を通してガス流を駆動するための気腹装置とを含み、該システムは、送気導管を通るガス流量または特定の流量を維持するのに必要な駆動圧力のいずれかが体腔圧に応じて変化しうるように構成されうる。【選択図】図１
