A system for delivering gas during a laparoscopic surgical procedure performed within a patient's abdominal cavity, comprising: a) a gas delivery device having a housing with a port for receiving insufflating gas from a gas source, the housing of the gas delivery device being configured for enclosing a pump for circulating pressurized gas throughout the system; b) a separate gas conditioning unit having a housing configured for operative association with the gas delivery device and including: i) a first internal flow path for receiving pressurized gas delivered from the pump; ii) a second internal flow path for delivering insufflating gas to the abdominal cavity and for facilitating periodic static pressure measurements from the abdominal cavity; and iii) a third internal flow path for returning pressurized gas to the pump; and wherein the first internal flow path includes an internal nozzle assembly that is located within the housing of the gas conditioning unit and is configured to accelerate the pressurized gas delivered by the pump enclosed in the gas delivery device to the gas conditioning unit and thereby generate a continuous pressure barrier contained within the gas conditioning unit that inhibits egress of insufflating gas from the abdominal cavity, wherein the housing of the gas conditioning unit is generally cylindrical and includes an inlet end and an opposed outlet end, and wherein the gas delivery device includes an engagement port for detachably receiving the gas conditioning unit, wherein the outlet end of the housing of the gas conditioning unit includes an outlet cover I having a first outlet port corresponding to the first internal flow path, a second outlet port corresponding to the second internal flow and a third outlet port corresponding to the third internal flow path, wherein the inlet end of the gas conditioning unit includes an inlet cover having a first inlet port corresponding to the first internal flow path which communicates with a first conduit, a second inlet port corresponding to the second internal flow path which communicates with a second conduit and a third inlet port corresponding to the third internal flow path which communicates with a third conduit. a) a gas delivery device having a housing with a port for receiving insufflating gas from a gas source, the housing of the gas delivery device being configured for enclosing a pump for circulating pressurized gas throughout the system; b) a separate gas conditioning unit having a housing configured for operative association with the gas delivery device and including: i) a first internal flow path for receiving pressurized gas delivered from the pump; ii) a second internal flow path for delivering insufflating gas to the abdominal cavity and for facilitating periodic static pressure measurements from the abdominal cavity; and iii) a third internal flow path for returning pressurized gas to the pump; and i) a first internal flow path for receiving pressurized gas delivered from the pump; ii) a second internal flow path for delivering insufflating gas to the abdominal cavity and for facilitating periodic static pressure measurements from the abdominal cavity; and iii) a third internal flow path for returning pressurized gas to the pump; and wherein the first internal flow path includes an internal nozzle assembly that is located within the housing of the gas conditioning unit and is configured to accelerate the pressurized gas delivered by the pump enclosed in the gas delivery device to the gas conditioning unit and thereby generate a continuous pressure barrier contained within the gas conditioning unit that inhibits egress of insufflating gas from the abdominal cavity, wherein the housing of the gas conditioning unit is generally cylindrical and includes an inlet end and an opposed outlet end, and wherein the gas delivery device includes an engagement port for detachably receiving the gas conditioning unit, wherein the outlet end of the housing of the gas conditioning unit includes an outlet cover I having a first outlet port corresponding to the first internal flow path, a second outlet port corresponding to the second internal flow and a third outlet port corresponding to the third internal flow path, wherein the inlet end of the gas conditioning unit includes an inlet cover having a first inlet port corresponding to the first internal flow path which communicates with a first conduit, a second inlet port corresponding to the second internal flow path which communicates with a second conduit and a third inlet port corresponding to the third internal flow path which communicates with a third conduit.