Safety penetrating instrument with triggered penetrating member retraction and single or multiple safety member protrusion

摘要: A safety penetrating instrument for establishing a portal in wall of an anatomical cavity includes cannula, member disposed within the lumen movable relative to place tip protected, non-exposed state, and various mechanisms simultaneously retracting while extending one or both cannula from locked positions wherein is extended position are retracted positions. Retraction extension protrusion either sleeve triggered individually combination by movement more three members upon entering cavity. Additionally, probe can be carried triggering retraction and/or similar manner moving predetermined proximal distance during penetration wall.