| 摘要 |
Disposable syringe ( 100 ) characterized in that it is provided a needle carrier socket element ( 4 ), coupable with a lip of a reservoir ( 1 ) from inside the same reservoir, in that a seal ( 46 ) is realized on said lip for seating a sealing gasket ( 7 ) between needle carrier socket ( 4 ) and reservoir lip, in that it is provided a double hook element ( 9 ), causing, after the piston stroke toward the end of said socket element ( 4 ) of the needle ( 5 ), to allow its retraction within the reservoir ( 1 ) during the reverse stroke of the piston ( 2 ) and in that an elastic element or spring ( 8 ) is provided between said double hook element ( 9 ) and the end of said reservoir lip, that, when compressed, maintains said double hook element ( 9 ) in its position, and when extended acts to cause the return of the needle ( 5 ) within the reservoir ( 1 ).
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