| 摘要 |
The invention generally relates to a needle assembly of the kind having a needle, an elongate blunting device, a shifting member, and a flash chamber. The needle is of the kind that has a needle proximal end, a sharp needle distal end and a needle cannula extending therethrough. The elongate blunting device is at least partially located within the needle cannula. The elongate blunting device is of the kind that has a blunting device proximal end, a blunting device distal end, and a blunting device blood flow passage therethrough through which blood can flow from the blunting device distal end to the blunting device proximal end. The shifting member can be actuated to move relative to the needle and, upon movement relative to the needle, causes movement to the elongate blunting device from a retracted position wherein the blunting device distal end is retracted into the needle cannula so that the sharp needle distal end can penetrate the body, to an extended position wherein the blunting device distal end extends out of the needle cannula so as to prevent the sharp needle distal end from penetrating the body.
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