保护鞘 meaning in English

protecting sheath

Unlike the rigid fixation of the fusion procedure , the artificial disc features a shock - absorbing cushion . the disc consists of a flexible centre sandwiched between 2 small , shell - shaped metal caps and is surrounded by a protective sheath . it thus allows for motion at the operated disc level and therefore reduces neighboring disc degeneration as occurs following the fusion operation
与颈椎融合手术不同的是，人工颈椎间盘系统有如一个吸收震动的弹簧，由一个具弹性的内核夹在两片小金属外壳中，外加一层保护鞘组成，植入患者的颈椎后，能确保患者的颈椎节段日后回复弹性，有效减低邻近颈椎盘的退化。