The present invention provides a system for cutting ligament or soft tissue in the body, comprising a flexible wire-like cutting element which has a smooth surface, a fetching tool and an imaging device. The fetching tool has a rigid, needle-shaped distal part. The length of the distal part is long enough to be extended from the first position which is laterally adjacent to the ligament to the second position which is also laterally adjacent to the ligament and opposite to the first position. Further, the apex of the distal part enables it to enter into the body from the first position, and move along one side edge of the ligament and come out of the body from the second position. The engaging and releasing structure at the distal part can be engaged with the cutting element at the second position, and in the course of returning along the original path, it is kept to engage with the cutting assembly until it returns to the first position outside the body where it will be released from the cutting assembly. The imaging device can display the position of the fetching tool relative to the ligament or soft tissue.本發明提供一種用於切割身體內的韌帶或軟組織的系統，包括：柔性的線狀切割元件，其具有平滑的表面；回取工具，其具有剛性針狀的遠端部分，所述遠端部分的長度足以使其從與所述韌帶橫向相鄰的第一位置延伸到與所述韌帶橫向相鄰並與所述第一位置相對的第二位置，並且所述遠端部分的頂端能夠使其從所述第一位置進入身體、沿著所述韌帶的一側邊沿移動並從所述第二位置伸出身體，並且所述遠端部分的接脫結構可以使其在所述第二位置處與所述切割元件接合，在其沿原路徑退回到所述第一位置的過程中與所述切割組件保持接合，並使其在退回到所述第一位置的體外處與所述切割組件脫開；成像裝置，其能夠顯示所述回取工具相對於所述韌帶或軟組織的位置。
