| 摘要 |
A safety penetrating instrument for penetrating an anatomical cavity wall to gain access to an anatomical cavity includes a distally-biased penetrating member and a distally-biased safety member, both of which are movable proximally in relation to a housing during penetration of the anatomical cavity wall. Upon penetrating into the anatomical cavity, an extending mechanism moves a cannula and/or the safety member distally relative to the housing in order to protect the distal end of the penetrating member. Extension or protrusion of the cannula and/or the safety member can be triggered by distally-biased movement of the safety member and/or the penetrating member upon entering the anatomical cavity. |
