| 摘要 |
The invention relates to a syringe (1) which comprises a rod (5) mounted for reciprocating movement in relation to a container (2), wherein one end of the rod has the form of a needle (3) or is able to coact with a needle. The syringe further comprises a piston (4) and coupling means (6) which connect and disconnect the piston to and from the rod. The coupling means assume a connecting state when the piston is drawn by the rod from a position proximate to the needle to a position in which it is distanced therefrom, and are brought to a disconnecting or disconnected state when the piston is pressed by the rod towards the needle. The coupling means comprise support and/or slide surfaces (5k', 5k) arranged on that part of the rod which is proximal to the needle, and opposing support and/or slide surfaces (4k', 4k) on the piston. The first support and/or slide surfaces (4k') provided on the piston and located nearest the needle (3) are inclined (c) to an extent such that as the rod (5) moves towards the needle (3), the piston (4) is rotated about a container centre line, among others. |
