FIELD: medicine.
SUBSTANCE: head of dental drill consists of case, impeller and bearings. Case has coating and cavity. Impeller contains shaft and blades. Device, preventing back suction, is placed between case coating and butt ends of respective shaft. Preventing device can be realised by implementation of head case coating as rubber head case coating or placement of rubber component between head case and impeller. Rubber coating of head case and rubber component can brake impeller in due time, as soon as back suction occurs, to reduce suction of dirt. Head can contain light-diode ring-shaped lamp. Contact and separation between upper lamp surface and electricity-conducting film provide respectively switching on and switching off of light-diode lamp.
EFFECT: simplified construction and ease of installation.
26 cl, 15 dwg
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