| 摘要 |
FIELD: medical engineering. SUBSTANCE: device has whole tube, toothed cutting edge, middle and tail part having flats. The teeth are arranged longitudinally and have trapezoid shape and cutting plane. The cutting plane is arranged at given angle of alpha. The teeth are arranged at positive frontal angle of gamma. The positive frontal angle is formed owing to frontal edge being displaced to a value of e from the axis so that , where D is the external drill diameter. EFFECT: low cost production; simplified design. 4 cl, 4 dwg
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