ligature
noun [ C ] medical specialized uk/ˈlɪɡ.ə.tʃər/ us/ˈlɪɡ.ə.tʃɚ/
（用于紧缚的）带子;（尤指捆扎血管的）结扎线，缚线
a thread or wire used for tying something, especially a blood vessel
Ligatures are used in surgery to stop the flow of a bleeding artery. 在外科手术中结扎线用于防止动脉血管出血。