| 摘要 |
A medical instrument includes a housing, a stylet having a portion in the housing, a cannula coaxially receiving the stylet and having a portion in the housing, and a member coupled to the housing. The stylet and the cannula are movable between an extended position and a retracted position. The member, e.g., a lever, is configured to move the stylet and the cannula from the extended position to the retracted position.
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