CUTTING INSTRUMENT Russian patent published in 1998 - IPC

FIELD: medical engineering. SUBSTANCE: device has stem 7 with neck 6 and working part 1 connected to neck 6 having lateral screw facets 2 and 3 and cutting end face edges 4. Lateral screw facets 2 and 3 are designed as cutting ones and arranged as right hand and left hand thread with pitch ratios being equal to (3:5)-(3:1), respectively. Working part 1 is additionally provided with cutting edges as protrusions 5 being in parallel relation to its longitudinal axis. The instrument optionally has width of protrusions 5 being equal to 0.2-0.8 d, where d is the working part diameter. The protrusions are oriented at an angle of 120 deg to each other. The cutting end face edges can have sharpening angle at their apices equal to 125-156 deg. EFFECT: wide range of functional applications. 4 cl, 3 dwg