Abstract: The invention concerns a surgical apparatus for the irrigation and aspiration of the operative cavity during endoscopic surgery. The apparatus comprises a reservoir of liquid for irrigation of the cavity, a pump for circulating the liquid in the cavity, a pressure measuring and control means, such as a piezometric cell and valve for measuring and controlling pressure in the cavity and a flow control means for controlling the flow of the liquid. The apparatus also provides temperature control means by which the temperature of the liquid may be adjusted, which along with pressure control means and adjustment of pressure of the liquid in the cavity, provides a desired hemostatic effect during the surgical process.