Pin drive rotary surgical cutting tools and powered handpieces

A surgical cutting tool (22) includes an elongated shaft (30) and a cutting head (38). The shaft defines a coupling portion (36) terminating at a proximal end (62) of the shaft, a stem portion (34), and a distal portion (32). The stem portion defines a central axis A. The coupling portion optionally defines a deflection surface (72a, 72b) positioned oblique with respect to the central axis and connected with a first driven surface (76a) and a second driven surface (74a). Upon insertion into a drive chuck (40) with drive pins (44a, 44b), the deflection surface promotes self-alignment of the cutting tool and the drive chuck. 外科切割工具(22)包括细长轴(30)和切割头(38)。所述轴界定终止于轴的近端(62)的联接部分(36)、杆部分(34)和远侧部分(32)。所述杆部分界定中心轴线A。所述联接部分任选界定相对于所述中心轴线倾斜安置且与第从动表面(76a)和第二从动表面(74a)连接的挠曲表面(72a、72b)。在利用驱动销(44a、44b)插入驱动卡盘(40)后，所述挠曲表面促进所述切割工具与所述驱动卡盘的自对准。