Abstract: This invention relates to a cervical canal catheter devised inorder not only to prevent possible complications accompanying the premature rupture of membrane in a pregnant woman, but also to carry extraction after positively awaiting the fetal maturity. Said catheter is made of a soft rubber or resin, has a gourd-shaped balloon or two independent balloons at the tip, and is used for preventing the efflux of amniotic fluid and the concomitant onset of labor-pains by inserting the catheter into cervical canal, expanding the balloon or balloons, and attaching the catheter by a conventional surgical closure of the cervix.