A needle unit includes an outer cannula and an inner wire passing through a passageway thereof. The outer cannula is straight or curved, and the outer cannula has a piercing end and an open end connected to the passageway. The piercing end has a dull tip. An opening is disposed around the dull tip of the piercing end or at a top of the piecing end of the cannula. The inner wire has a threading part at an end thereof near an opening of the outer cannula. The threading part allows the suture thread passing through the threading part, and the inner wire is movable inwardly or outwardly via the opening. Therefore, the needle unit can be advantageous to tie the desired vessels or parenchyma of a liver in hepatic resection with less restriction.本發明是揭露一種套針組,其包括外套管體以及設於外套管體之內部通道的內部線體。外套管體為直管或彎管,且外套管體具有內部通道,且該外套管體更具有穿刺端以及連接內部通道之開口端。穿刺端具有一鈍端。外套管體之穿刺端的鈍端附近或穿刺端的末端上具有一開孔。內部線體在鄰近外套管體之開孔之一端具有穿線部。縫合線係穿過穿線部,而內部線體則由開孔進出。因此,在肝臟切除手術中,利用套針組有利於結紮特定血管或肝實質,且較不受限。100...套針組110a/110b...外套管體111...內部通道113...外套管體之開口端115...外套管體之穿刺端117...開孔120...內部線體121...穿線部130...縫合線α...弦切角θ...中心角w...寬度
