Needles include a cannula defining a bore within the cannula, a distal opening of the bore of the cannula, and one or more of at least one protrusion or an enlarged rounded surface on a proximal surface of the needle proximate the distal opening and at least one chamfered surface positioned proximate a tip of the cannula. Methods include forming at least one protrusion on a distal portion of a needle bordering a distal opening of the needle.
