摘要: The first attempt to use fluids distend the uterine cavity in hysteroscopy was described 1908 by David1. To overcome known disadvantages arising from two characteristic features of uterus (the slit-shaped with walls practically apposition and ease which endometrial bleeding occurred after contact any instrument), Rubin2 later tried an arrangement water irrigated over lens hysteroscope means negative pressure. Rubin regarded positive pressure as contraindicated. Unfortunately, his results were not satisfactory.