胀管为开口薄壁套管；
套管头四通包括固定和密封套管柱上端的部件，并经常提供一个用于与环形空间连通的开口。
The casing bowl incorporates features to secure and seal the upper end of the casing string and frequently provides a port to enable communication with the annulus.
第一和第二套管针活门定位在套管主体端盖内，并且各自在其中间部分具有开口。
First and second trocar valves are positioned within the cannula body end housing and each having an opening in a medial portion thereof.
套管 头端开口的全新设计，能减少阻塞。
Minimum clogging thanks to the redesigned opening at the end of outer tube.
套管 头端开口的全新设计，能减少阻塞。
Minimum clogging thanks to the redesigned opening at the end of outer tube.
应用推荐