| 摘要 |
An annular cutter (10) comprising: a body (20) including a peripheral annular wall (30) having a leading end (34) defining a cutting surface (40), the cutting surface (40) being configured to rotate about a central longitudinal axis of the body (20) as the annular cutter (10) is advanced along the longitudinal axis in a cutter advancement direction; wherein the cutting surface (40) includes: a plurality of circumferentially spaced scalloped blade portions (42); and a plurality of recessed regions (44), each of the plurality of recessed regions (44) being provided circumferentially between a respective pair of the plurality of circumferentially spaced scalloped blade portions (42) and aligned along the longitudinal axis with at least a part of at least one scalloped blade portion of the plurality of circumferentially spaced scalloped blade portions (42). |
