Zero back suction device for disposable high-speed turbine dental drill handpiece

Abstract

The invention provides a zero back suction device for a disposable high-speed turbine dental drill handpiece, which is mounted at two ends of a handpiece head body; at the side where a drill point is mounted on the handpiece head body, the device is composed of an elastic shaft seal cover and a non-elastic shaft seal cover of a center framework of which the center is embedded with a hard substance, and the lip of the elastic shaft seal cover is matched with a rotor shaft of which the end part is conical; at the side of a handpiece head cover of the handpiece head body of the device, an O-shaped seal ring is mounted between a button cover body and a handpiece head cover body, and a ball non-return valve is additionally arranged at the center of the button cover body; and because anti-back suction measures are adopted at two sides of the handpiece head body, the content of back suction substances can be controlled to be very low, namely that an almost zero back suction state is realized.

Description

technical field [0001] The invention belongs to a medical device, in particular to a dental hand-held appliance for drilling and grinding teeth. Background technique [0002] Existing high-speed turbo dental drill handpieces comprise a head body, a head cover, a drill needle, a front handle, and a rear handle, see figure 1 . The rear handle is connected with the quick-plug connector of the dental treatment machine to obtain the compressed air and cooling pressure water required for the mobile phone to work. The front handle is the part held by the doctor. A wind wheel that can be driven by compressed air is installed in the machine head body. The wind wheel is installed in the middle of the wind wheel shaft, supported by two bearings and damped by two O-shaped rubber rings. [0003] At present, this dental drill handpiece can produce suck-back phenomenon, which may lead to iatrogenic cross-infection. The reasons are as follows: [0004] 1) Generation of pollution source...

AI Technical Summary

Problems solved by technology

[0006] 2) Suckback can lead to iatrogenic cross-infection

At this time, if the mobile phone head is completely immersed in water, water will enter the turbine chamber from the gap between the head cover and the button cover under the negative pressure of the wind wheel chamber, causing iatrogenic cross-infection

[0012] The above water immersion test shows that although the patent ZL20061020074.X and other anti-suckback devices involving one side have the anti-suckback function in the one-sided water immersion test, and can even achieve zero back-suction, they are completely immersed in water. However, it cannot prevent the occurrence of back suction, because the back suction material will enter the fan chamber from the other side, so there is still a back suction phenomenon and there may be iatrogenic cross-infection. See Figure 5 , Image 6

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