| 摘要 |
PCT No. PCT/GB81/00094 Sec. 371 Date Jan. 25, 1982 Sec. 102(e) Date Jan. 25, 1982 PCT Filed May 28, 1981 PCT Pub. No. WO81/03420 PCT Pub. Date Dec. 10, 1981.A vacuum extractor for use in childbirth has an evacuable suction cup for engaging the child's scalp, the cup being connected to a source of a pulling force in a manner which ensures that the line of the force passes substantially through the center of the cup's lip, thereby minimizing the production of tilting moments on the cup on application of an oblique pulling force. |
