Abstract: A verres needle assembly includes an outer sheath member, a detachable stylet subassembly and a high flow adaptor that replaces the stylet subassembly. The outer sheath includes a cutting edge for making an initial surgical incision. The stylet subassembly is spring loaded to protect the cutting edge after the initial incision and also permit gas to be injected to partially inflate a body cavity. A simple half twist or luer lock connection allows the stylet subassembly to be easily removed and replaced by a high flow adaptor. Gas can then be injected through the outer sheath which remains in position after removal of the stylet subassembly without any internal restriction. The entire insufflation procedure takes less time than for a conventional verres needle.