| 摘要 |
A safety trocar penetrating instrument particularly useful in least invasive surgery includes a portal sleeve, a trocar disposed in the portal sleeve and having a sharp, solid, angled tissue penetrating distal end and a safety shield disposed in the portal sleeve and receiving the trocar, the safety shield being movable relative to the trocar between an extended position wherein a distal end of the safety shield protects the sharp tip and a retracted position exposing the sharp tip. The configuration of the distal ends of the trocar and the safety shield in the retracted position present a substantially continuous, angled surface for penetrating tissue. A hub receiving proximal ends of the trocar and safety shield includes a locking mechanism allowing the safety shield to be automatically or optionally locked in the extended position and permitting selective, releasable or automatic locking of the safety shield in the retracted position.
|
