Operation procedure were 78 lobectomies, 7 bilobectomies, 33 pneumonectomies, 9 wedge resections or segment resections.
肺单叶切除78例，两叶切除7例，全肺切除33例，楔形切除或段切9例。
2
As a sophisticated tunnel lining type, the universal wedge-shaped segments can do a good job in the control of the axis of the shield-driven tunnel and the quality of the segment ring.