| 摘要 |
A trocar (2) includes a hollow body (4) defining a path between its proximal and distal ends with an obturator assembly (6) positioned along the path. The tip (34, 36) of the obturator assembly has a cutting element (38). A novel gas sealing assembly (114) seals the path along the trocar body and includes first and second sealing elements (122) each movable laterally, typically radially, along a linear path between a sealing position, to seal the path when an object, such as an obturator barrel (14), is not positioned along the path, and an object passing position, when an object is positioned along the path. The gas sealing assembly also includes a flexible, elastic, conical element (144) with a hole (158) at its tip and raised ridges or rings (164) along its inner surface (154), for sealing the path when an object is positioned along the path.
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