Abstract: The apparatus, used for introducing limited quantities of carbon dioxide into the human body for operational purposes, particularly laparoscopy, includes a control device for delivering the carbon dioxide, a connecting nipple on the control device for connecting a flexible tubing to a Veress needle introducable into the body and a pressure gauge for indicating the pressure present in the body cavity. A second connection nipple is provided on the control device and connected by a nipple to the pressure gauge. The second connection nipple is connected by a further flexible tubing either to a dual Veress needle or to a second single Veress needle, so that the pressure gauge is directly connected with the body cavity rather than through the operative Veress needle.