A needle assembly for an infusion set, comprising: a needle having a sharpened end and an opposing end; and a needle tip shield for shielding the needle, comprising: a needle shield connectable to an infusion set base; a needle hub fixedly connected to the opposing end of the needle, wherein the needle shield and needle hub are displaceable relative to each other from a first state, in which the sharpened end of the needle is exposed outside the needle shield, to a second state, in which the sharpened end of the needle is shielded by the needle shield; and an actuation button movably connected to the needle hub and movable relative to the needle hub from a first button state to a second button state; characterized in that: wherein the actuation button includes a lower portion connected to a lever having a fulcrum and a push tab at a free end of the lever; and wherein actuation of the actuation button by a user pressing the push tab in a first direction causes the fulcrum to contact the needle hub and move the lower portion to travel in a second direction opposite to the first direction from the first button state to the second button state. a needle having a sharpened end and an opposing end; and a needle tip shield for shielding the needle, comprising: a needle shield connectable to an infusion set base; a needle hub fixedly connected to the opposing end of the needle, wherein the needle shield and needle hub are displaceable relative to each other from a first state, in which the sharpened end of the needle is exposed outside the needle shield, to a second state, in which the sharpened end of the needle is shielded by the needle shield; and an actuation button movably connected to the needle hub and movable relative to the needle hub from a first button state to a second button state; a needle shield connectable to an infusion set base; a needle hub fixedly connected to the opposing end of the needle, wherein the needle shield and needle hub are displaceable relative to each other from a first state, in which the sharpened end of the needle is exposed outside the needle shield, to a second state, in which the sharpened end of the needle is shielded by the needle shield; and an actuation button movably connected to the needle hub and movable relative to the needle hub from a first button state to a second button state; characterized in that: wherein the actuation button includes a lower portion connected to a lever having a fulcrum and a push tab at a free end of the lever; and wherein actuation of the actuation button by a user pressing the push tab in a first direction causes the fulcrum to contact the needle hub and move the lower portion to travel in a second direction opposite to the first direction from the first button state to the second button state. wherein the actuation button includes a lower portion connected to a lever having a fulcrum and a push tab at a free end of the lever; and wherein actuation of the actuation button by a user pressing the push tab in a first direction causes the fulcrum to contact the needle hub and move the lower portion to travel in a second direction opposite to the first direction from the first button state to the second button state.