BIOPSY ROTARY CUTTING DEVICE

A biopsy rotary cutting device, comprising a dynamic sealing structure (4) provided outside an inner knife tube (3). The dynamic sealing structure (4) forms a cavity outside the inner knife tube (3). The inner knife tube (3) comprises a first tube section (31) and a second tube section (32) that are sequentially arranged in the axial direction of the inner knife tube (3). The outer diameter of the second tube section (32) is less than the outer diameter of the first tube section (31). The dynamic sealing structure (4) is internally provided with a seal ring (43). The cavity comprises a first cavity (41) and a second cavity (42). When the inner knife tube (3) moves to a first position along the axial direction thereof, the seal ring (43) is outside the second tube section (32), and there is an inter-cavity gap (46) between the seal ring (43) and the second tube section (32), to communicate the first cavity (41) with the second cavity (42). The biopsy rotary cutting device can introduce atmospheric air and form