Objective: to study the diagnosis and management of the rupture of previa blood vessel of velamentous insertion of umbilical cord.
目的：探讨脐带帆状附着前置血管破裂的诊断及处理。
Provided is an annular metal cord and an endless metal belt which have an excellent rupture strength and which can be easily manufactured, and a method for manufacturing the annular metal cord.
本发明公开一种具有高断裂强度和耐疲劳性且容易制造的环形 金属线和环形金属带，以及该环形金属线的制造方法。
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