1. The needle unit (1) for use with the container (2) comprising: i) a needle hub (4) in which is fixed the needle (5), wherein said needle has a distal end (6) and ii) provide a needle safety system comprising - the protective ring (42) adapted to translationally move relative to said needle hub between the distal position wherein said guard ring covers at least a portion of the distal end of said needle and wherein said needle is in the storage position or in the sTATUS uu completion of use, and a proximal position wherein the shield ring leaves said distal end open, and wherein the needle unit is in use, the containment ring is movable in said proximal position between the intermediate position in which the needle is partially inserted into the injection site and most proximal position where the needle is fully inserted into the injection site, - folding means (40, 43, 47, 48) connected to said guard ring and upo -mentioned needle hub configured to transition from the unfolded configuration in which said containment ring is in its distal position, in the fully folded configuration, wherein said guard ring is in the most proximal position, - biasing means (30) operable to expand from a loaded state to a quiescent state, providing transfer means of folding them completely folded configuration in an unfolded configuration upon removal of the needle from the injection site -1. Игольный блок (1) для использовании с емкостью (2), содержащий:i) игольную втулку (4), в которой зафиксирована игла (5), причем упомянутая игла имеет дистальный конец (6) иii) систему обеспечения безопасности иглы, содержащую:- защитное кольцо (42), выполненное с возможностью поступательного перемещения относительно упомянутой игольной втулки между дистальным положением, в котором упомянутое защитное кольцо охватывает по меньшей мере часть дистального конца упомянутой иглы и в котором упомянутая игла находится в состоянии хранения или в состоянии завершения использования, и проксимальным положе
