Embodiments of the invention provide apparatus, systems and methods for introducingfluids into a body cavity for hypothermic and resuscitative treatment. One embodimentprovides an apparatus for introducing fluids into a peritoneal cavity comprisingan access device for insertion into subcutaneous tissue, an infusion memberand an advancement member. The access device includes a lumen, a proximal end,a tissue penetrating distal end and a stop for controlling the depth of the distalend into tissue. The infusion member includes an infusion lumen, a removal lumenand at least one sensor and is advanceable from a lumen of the access device intothe peritoneal cavity. The advancement member is removably positionable inan infusion member lumen and has sufficient column strength to advance the infusionmember tip through abdominal wall tissue into the peritoneal cavity. When theadvancement member is removed, the infusion member tip is substantially atraumatic.
