| 摘要 |
A needle insertion tool has a front plunger (3) axially movably provided near a fore-end of and in a housing (1) and having an insertion needle (42), a rear plunger (5) provided behind the front plunger so as to be axially movable in the housing, a front spring (6) for pulling backward the front plunger, and a rear spring (7) for pushing forward the rear plunger. The insertion needle can be instantly, forcibly projected a cap (2) and then reversed, so that a moving distance of the front plunger with the insertion needle can be reduced. This solves a problem such as the microvibration of the needle and a measuring instrument or the microvibration and shock of the springs being transmitted to a fingertip for a long time, dulling a patient's pain as much as possible. |
