| 摘要 |
An injection syringe, at least comprising a piston (2), a liquid holder (1) and a needle (5), where the needle is situated on a needle holder (4) which is displaceable in the liquid holder, and where before use the needle is situated in the liquid holder and can be driven out by displacing the piston, as a result of which the needle holder is clamped, while the needle holder also serves as an auxiliary piston which with the piston bounds a liquid space, according to the invention there is at the other side of the needle holder an expansion agent (8) which becomes active with delayed effect after sliding out of the needle, and is equipped to drive back the needle holder with the needle. |
