Implementations of a capillary tube syringe are provided. In some implementations, a capillary tube syringe comprises an elongated hollow outer tube having a proximal end and a distal end and a needle extending from the first end of the outer tube outside the outer tube and extending inside the outer tube. In some implementations, an elongated hollow capillary tube having a proximal end and a distal end extend along the inside of the outer tube. In some implementations, a normally compressed spring is operatively connected to the needle. In some implementations, the spring is configured to expand when activated to retract the needle inside the elongated hollow tube. In some implementations, the capillary tube diameter is less than or equal to 0.865 inches.
