| 摘要 |
A front element not constrained to the front portion of the needle is provided, foldable on itself about a first folding axis parallel to the front portion. The rear portion of the needle is constrained to the front element such that the needle can rotate with respect to the front element about a second folding axis perpendicular to the needle. The device can assume a first operating configuration in which the element is folded on itself by rotation about the first axis, with the front portion of the needle enclosed between the two fins of the element, these facing each other and being close together. The device includes an elastically soft layer applied to the inner surface of the front element in correspondence at least with the final portion of the needle. When the front element is folded on itself into the first configuration this layer presses against the final portion of the needle to close its mouth opening.
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