| 摘要 |
Self-disabling or self-locking single-use syringe of the passive type, i.e., one that is self-locked after first use of the syringe, in such a way that any attempted reuse is prevented, comprising: a barrel which has an inner surface which defines a chamber for retaining a fluid, a plunger which comprises an elongated body, said elongated body comprising a plurality of longitudinal ribs and a piston which is connected to the end of the plunger close to the needle, the outer surface of the piston forming a fluid-tight connection with the inner surface of the barrel. The barrel comprises at least two rings provided on the internal face of the barrel and having the general shape of a circular crown with a variable internal radius, and in that each of the longitudinal fins of the piston has a height which is different from that of at least one of the other fins, in such a way that the plunger can be inserted tightly through the space defined by the variable internal radius of the barrel rings. |
