| 摘要 |
The device comprises an outer tubular and an inner tubular slidingly received within the outer tubular. The inner tubular has a distal end including an upper member and a lower member. Further, the device includes an open position with the distal end fully extended from the outer tubular, and a closed position with the distal end disposed within the outer tubular, wherein the upper member is biased away from the lower member and is disposed at an open angle ¸ o relative to the lower member when the device is in the opened position. A longitudinal axis of the lower member is fixed substantially parallel to a central axis of the outer tubular member, and at least a portion of a distal edge of the upper member and the lower member is sharpened. |
