Bore head for boring bone channels

Abstract

Abstract Drill head for boring out bone channels, characterized by the following features: a central bore for a guide wire; four spiral teeth arranged at 90% intervals on the periphery and having a small angle of twist, such as 15°, that form an angle of approximately 45% relative to the longitudinal axis of bore at the forward end in the starting cut and that form the main cutting edges and whose secondary cutting edges consecutive to the main cutting edges are located approximately on a cylinder whose axis coincides with the axis of the bore, the length of the secondary cutting edges located on the cylindrical surface is smaller than the diameter of the cylinder; the rounded base of the slot-like chip chambers between the teeth is radially close to the bore and the faces of the teeth bordering the chip chambers in the starting cut area are provided with a ground face such that a relatively sharp edge is formed, extending from the ends of the teeth and the chip chamber surfaces between them to the bore.

Inventors

• 👤 Hans Erich Harder

Bibliographic Details