| 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 th at any attempted reuse is prevented, and is characterised in that it compris es 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 di fferent 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 in ternal radius of the barrel rings. In this way resistance to the passage of the piston is minimised, thereby reducing the risk of causing bruises, and w ith a manufacturing cost substantially similar to that of conventional syrin ges.
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