TISSUE RESECTING INSTRUMENT

An end effector assembly (100) of a tissue-resecting device includes an outer shaft (120) defining a window (128), a drive wire (140) extending through the outer shaft (120), and a distal cutting tip (150) disposed within the outer shaft (120). The drive wire (140) includes a cylindrical body (142) and a distal end portion (144) defining a semi-cylindrical configuration including a semi-cylindrical bottom surface and a planar top surface having a semi-cylindrical cut-out defined therein. The distal cutting tip (150) at least partially overlaps the window (128) and has a semi-cylindrical lumen defined by a semi-cylindrical bottom surface and an open top. The distal end portion (144) of the drive wire (140) is at least partially received and within the semi-cylindrical lumen with the semi-cylindrical surfaces substantially mating. The drive wire (140) is configured to drive rotation or oscillation of the distal cutting tip (150) relative to the outer shaft (120).