| 摘要 |
<p>An automatic retractable safety trocar instrument (10) for introducing a portal sleeve (14) into a cavity in the body includes a portal sleeve, a trocar (12) disposed within the portal sleeve and a safety shield (16) disposed between the portal sleeve and the trocar and having a distal end (26) biased to an extended position protruding beyond a distal end of the portal sleeve. The trocar is supported in a manner to automatically move proximally from an operative position wherein a sharp distal end of the trocar protrudes from the portal sleeve to a retracted position wherein the sharp distal end is protected within the instrument in response to distal movement of an operating member upon penetration into a cavity in the body. The safety shield is supported in a manner to automatically move proximally from the extended position during penetration of tissue (T) and to automatically move distally toward the extended position upon introduction of a distal end of the portal sleeve in an anatomical cavity.</p> |
