METHOD OF TREATING BONE TISSUE AND SURGICAL INSTRUMENT FOR EFFECTING THE METHOD Russian patent published in 1994 - IPC

FIELD: medical engineering. SUBSTANCE: surgical instrument transforms rotational motion of shaft 4 and electric motor 2 of a power unit into angular harmonic oscillatory motion of tubular drill 7 with the aid of eccentric 14 and fork 16. Oscillation amplitude should be equal to 2.23-2.38 of a pitch of the drill bit teeth of tubular drill 7 and oscillation frequency should be within the range of 20.5-23.5 Hz. An angle at the vertex of the drill bit teeth should lie within the range of 58-61 degrees and setting angle of teeth should be within the range of 3.688.1 degrees, every other tooth being set outwardly. EFFECT: reduced traumatism of bone and soft tissue. 8 cl, 1 tbl