A needle assembly, comprising: a needle having a sharpened end and an opposing end, the needle being insertable through a base; and a needle shield device, comprising: a first shield connectable to one of the base and a fluid connector connectable to the base, the first shield being fixedly connected to the opposing end of the needle and having at least one cantilevered arm with a tapered edge; a second shield having a stop, wherein in a first position of the second shield relative to the first shield, in which the sharpened end of the needle is exposed outside the second shield, the stop engages with the tapered edge of the first shield to create a jam connection with the one of the base and the fluid connector, the first and second shields having a common central axis; and a biasing element biasing the first shield axially away from the second shield; wherein proximal displacement of the second shield relative to the one of the base and the fluid connector proximally displaces the first shield along with the second shield until the first shield is no longer connected to the one of the base and the fluid connector; and wherein when the first shield is no longer connected to the one of the base and the fluid connector, under the force of the spring, the cantilevered arm of the first shield deflects relative to the stop and the first shield displaces axially relative to the second shield to cover the sharpened end of the needle. a needle having a sharpened end and an opposing end, the needle being insertable through a base; and a needle shield device, comprising: a first shield connectable to one of the base and a fluid connector connectable to the base, the first shield being fixedly connected to the opposing end of the needle and having at least one cantilevered arm with a tapered edge; a second shield having a stop, wherein in a first position of the second shield relative to the first shield, in which the sharpened end of the needle is exposed outside the second shield, the stop engages with the tapered edge of the first shield to create a jam connection with the one of the base and the fluid connector, the first and second shields having a common central axis; and a biasing element biasing the first shield axially away from the second shield; a first shield connectable to one of the base and a fluid connector connectable to the base, the first shield being fixedly connected to the opposing end of the needle and having at least one cantilevered arm with a tapered edge; a second shield having a stop, wherein in a first position of the second shield relative to the first shield, in which the sharpened end of the needle is exposed outside the second shield, the stop engages with the tapered edge of the first shield to create a jam connection with the one of the base and the fluid connector, the first and second shields having a common central axis; and a biasing element biasing the first shield axially away from the second shield; wherein proximal displacement of the second shield relative to the one of the base and the fluid connector proximally displaces the first shield along with the second shield until the first shield is no longer connected to the one of the base and the fluid connector; and wherein when the first shield is no longer connected to the one of the base and the fluid connector, under the force of the spring, the cantilevered arm of the first shield deflects relative to the stop and the first shield displaces axially relative to the second shield to cover the sharpened end of the needle.