A needle assembly (10) including a cannula (12) having a sharpened distal end (20a), a line of elements (28) n the cannula (12) extending reward from the distal end (20a). A yieldable positioner (32) positions the elements (28) more proximate the distal end (20a). The positioner (32) may be in various forms including a plug (32), a tab (214) in the cannula (12) and a distortion (364). A stylet (22) engages the line of elements (28).
