Design of saline drip package?? Hi all. I am studying the principle of the saline drip package in order to modify it to suit my slow-flow-rate delivery system. But I can hardly find any explanation of the principles involved. Do anyone have such links? or could you explain the principles of such a drip package? What's so special with such a design? Especially the thing encircled. It is said that the volume of each droplet remains the same all the time. But, so what?