| 摘要 |
A penetrating instrument for penetrating a wall of an anatomical cavity to gain access to the anatomical cavity includes a fixed or retractable penetrating member having a distal end for penetrating the anatomical cavity wall, a portal sleeve fixed relative to the penetrating member or movable between an extended position protecting the distal end of the penetrating member and a retracted position exposing the distal end of the penetrating member, and an expandable portion carried by the portal sleeve and movable from an expanded position to a contracted position during penetration of the cavity wall and from the contracted position to the expanded position upon introduction of the expandable portion in the anatomical cavity to anchor the portal sleeve relative to the anatomical cavity wall.
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