Zero-suckback device for disposable high-speed turbine dental drill handpiece

摘要

A zero-suckback device for a disposable high-speed turbine dental drill handpiece includes two units respectively installed at two ends of the head of the handpiece. On one side of the handpiece head where a drill pin is installed, one unit consists of an elastic shaft sealing casing which is centrally embedded with a central framework made of hard substances and a non-elastic shaft sealing casing, and a lip portion of the elastic shaft sealing casing fits a wind wheel shaft with a tapered end. On the cover side of the handpiece head and between a button housing and a head housing, an O-shaped sealing ring is installed, and a one-way ball valve is installed at the center of the button housing. Suckback prevention measures are adopted at both sides of the handpiece head, so matters sucked back can be controlled to be a very low level, nearly zero.