A safety assembly of the pen syringe needle (10) comprising: a connecting hub (12) having a proximal end (24) and a distal end (26)； a needle (14 fixed to said connection hub (12), said needle (14) having a distal end (48), formed for insertion into a patient, and a proximal end (50), extending said needle (14) distally from said distal end (26) of said connecting hub (12) to define an injection length of said needle (14) between said distal end (48) of said needle (14) and said distal end (26) of said connection hub (12)； a first sliding protection (16) relative to said connection hub (12) from a first state, in which said protection covers at least a substantial portion of said injection length of said needle (14 ), to a second state, in which at least a substantial portion of said injection length of said needle (14) is exposed； and a second sliding protection (18) relative to said connecting hub (12) from a first position, in which said protection covers said proximal end (50) of said acute ja (14), to a second position, in which said proximal end (50) of said needle (14) is exposed； characterized in that, a single load element (20) is arranged between said first and said second protections (16, 18) configured to simultaneously generate a load force configured to force said first protection (16) distally towards said first state and to generating a loading force configured to force said second protection (18) proximally towards said first position.Un conjunto de seguridad de la aguja de jeringa tipo pluma (10) que comprende: un cubo de conexión (12) que tiene un extremo proximal (24) y un extremo distal (26)； una aguja (14 fija a dicho cubo de conexión (12), teniendo dicha aguja (14) un extremo distal (48), formado para su inserción en un paciente, y un extremo proximal (50), que extiende dicha aguja (14) distalmente desde dicho extremo distal (26) de dicho cubo de conexión (12) para definir una longitud de inyección de dicha aguja (14) entre dicho extremo dista
