COMBINED ANNULAR DRILLING FOR BLIND HOLES IN BONE TISSUE Russian patent published in 2018 - IPC A61B17/16 

FIELD: medicine.

SUBSTANCE: invention relates to medicine. Combined circular drill for blind holes in the bone tissue contains a working part and a shank. Working part is a tubular body, made slotted in the form of petals with cutting gears on the ends. Working part consists of two coaxial and symmetrically arranged tubular two-petal housings one in the other. Cases are fixed with the help of flanges made on them on the end surface of a tubular shank with an external thread for a driven rotating handle that interacts with an axially transverse cross beam and a helical spring placed inside the shank with radial protrusions on the pushers. Pushers are installed in diametrically made along the entire length of the grooves on the outer surface of the inner tubular body, at the ends facing the cutting gears of which there are cut-off cutters in the form of figured elastic plates with curvilinear ends bent to the center with cutting gears at the ends located in the notches on the end curved surfaces of the petals of the inner case adjacent to the inner curvilinear surfaces of the annular shoulders at the ends of the petals of the outer tubular housing with cutting triple blades.

EFFECT: invention provides for obtaining blind annular holes and a separated from the bone tissue hollow core that is integral throughout the depth of drilling in the bone tissue of the neck and the femoral head.

1 cl, 12 dwg