| 摘要 |
<p>With regard to a syringe that allows a needle to be retracted within a barrel main body on completion of an injection by engaging a needle base with an extremity of a piston and pulling back the piston, the engagement between the needle base and the piston extremity is confirmed visually. However, since the two members are arranged within the extremity of the barrel, it cannot be said that visual confirmation is easy. In order to solve the above-mentioned problem, the present invention is characterised in that projections (11, 22) are provided on the base side of the inner face of a barrel main body (1) and on the base side of a piston (2), and the two projections (11, 22) making physical contact and snapping back at the same time as a needle base and a piston extremity engage with each other on completion of the injection generate an aural signal and/or a tactile signal. It is thereby achieved that possible aural and/or tactile recognition of the engagement is easily and reliably carried out with respect to the piston extremity and the needle base to which a needle (5) is connected. <IMAGE></p> |
