| 摘要 |
A shield mechanism is provided for an IV catheter assembly that includes an introducer needle (14) for inserting the IV catheter (22) into a vein of a patient. The shield mechanism includes a guard (40) that is slidably movable along the needle (14) from a proximal position where the sharp distal tip (18) of the needle (14) is exposed to a distal position where the sharp distal tip (18) of the needle (14) is safety shielded. A hinged arm (54) connects the guard (40) to a hub (20) of the needle (14). The hinged arm (54) can be collapsed upon itself, such that the guard (40) is adjacent the hub (30) of the needle (14). Alternatively, the hinged arm (54) can be extended to cause the guard (40) to move distally along the needle (14) and into a position for shielding the sharp distal tip (18) of the needle (14). A spring (68, 90, 95) may be provided to assist movement of the guard (40) toward the distal shielded position. A mechanism is provided to temporarily connect the guard (40) to the catheter hub (30) to automatically shield the needle (14') when it is withdrawn from the catheter. |
