| 摘要 |
<p>A retractable safety penetrating instrument includes a cannula (14) and a needle (12) disposed within the cannula and supported in a manner to automatically move proximally from an extended position wherein a sharp distal end (18) of the neddle protrudes from the cannula to a retracted position wherein a sharp distal end (18) of the needle protrudes from the cannula to a retracted position wherein the sharp distal end of the needle is protected in response to distal movement of the retractable safety penetrating instrument upon penetration into a cavity in the body. A retracting mechanism (48) moves the needle proximally, is normally locked in a position preventing proximal movement of the needle and is released by distal movement of an operating member (68) to trigger retraction of the needle.</p> |
