600899C-IV and 600899C-V electrical suction units are new style mobile suction devices for medical use designed for operations of gynaecology in hospitals. It is fit for induced abortion for women in early pregnancy, and can be widely used in suctioning of fetal head for women in child delivery as well as remains after child delivery and other secretions, pus and blood in surgical operations. The machine adopts oil-free lubricating vacuum pump, avoiding the pollution of oil mist. The pump requires no daily maintenance and servicing. The overflow protection device in the machine prevents liquid from flowing into the pump. Being of one-way mode, the pump does not produce positive pressure, ensuring safety in use and convenient operation. Hand-operated switch and footstep-operated switch are connected in parallel for option. The complete machine works stably and produces low level of noise. It is long in service life and safe and reliable in use.