“…Diffusion of gases through the walls of the rubber bag, which acts as a semipermeable membrane, is thought to take place [6,10,12,15]. The level of intramural pressure driving gas into the balloon as well as the solubility and diffusibility of the gas in rubber, the surface area of the balloon wall, and the duration of exposure of the balloon to gas are all significant factors affecting distention [6,12]. Thicker, less permeable neoprene rubber is used in some tubes to help decrease the inward diffusion of intestinal gas.…”