Abstract: A needle assembly comprising an outer cannula having a restraining element, an inner rod capable of being removably inserted into a hollow cross-section of the outer cannula, a handle having a flexible restraining member with a restraining nub and a protruding element whereby a force applied to the protruding element disengages the restraining nub from the outer cannula restraining element and the handle can be removed and attached to the outer cannula. Other embodiments of the invention comprise a strike cap integrally connected to the inner rod whereby a force applied to the strike cap is directly transferred to the inner rod. Other embodiments of the invention comprise a rod attachment member connected to the inner rod and the handle having at least one handle attachment element whereby the inner rod attachment member cooperates with the handle attachment element to removably attach the inner rod to the handle.