False water breaking - Gihasui

...Meanwhile, if the membranes break before the start of labor (labor) it is called premature rupture, and if the membranes break before the cervix is ​​fully dilated during labor it is called premature rupture. Sometimes the amniotic membrane is divided into two layers, and when one of them breaks and the fluid that has accumulated between them leaks out, this is called false rupture. Furthermore, when the membranes break, it is normal to be able to touch the fetus directly, but sometimes the membranes do not break at the bottom, but break inside the uterine cavity, and the presenting part of the fetus is still covered by the membrane even though the amniotic fluid has leaked out. ...

*Some of the terminology that refers to "false membrane rupture" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…一方，分娩(陣痛)開始前の破水を前期破水といい，分娩中に子宮口全開大以前の破水を早期破水という。また，ときに卵膜が2枚に分かれていて，その1枚が破れてその中間に貯留した液が流出することを偽破水という。さらに破水がおこれば，胎児が直接触れられるようになるのがふつうであるが，破水が卵膜の最下端でおこらず，子宮腔内で破れたために，羊水は漏出していても胎児先進部はまだ卵膜をかぶっていることがある。…

※「偽破水」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報