Disposable high-speed turbo dental drill handpiece anti-suckback device

Abstract

A single-use device for preventing back siphonage in a high-speed turbine dental handpiece. The device is installed on a side of a handpiece head (1) provided with a burr (3). The device comprises an elastic spindle sealing cover (17) and an inelastic spindle sealing cover (15). After successively connecting the device, the elastic spindle sealing cover (17) will press against a conical braking surface of a turbine spindle (9) once the dental handpiece is switched off, achieving rapid braking and preventing back siphonage. A metal ring (18) is provided in the center of the elastic spindle sealing cover (17) to prevent a curved deformation of the elastic spindle sealing cover (17) caused by air pressure-induced swelling, thereby avoiding loss of rotation speed and output power. The inelastic spindle sealing cover (15) can prevent excessive air pressure-induced swelling and resulting loss of elasticity of the elastic spindle sealing cover (17). The device has low cost and is able to stop back siphonage, extend a service life of the elastic spindle sealing cover (17), and effectively prevent cross infection.

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 handpiece comprises machine head body, machine head cover, drill pin, front machine handle, rear machine handle to form. 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 cause iatrogenic cross-infection. The reasons are as follows: [0004] 1) Generation of pollution s...

AI Technical Summary

Problems solved by technology

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

[0011] The size of the wind wheel shaft is φ3.175mm, the size of the drill pin is φ1.6mm, the inner hole of the anti-suckback elastic shaft seal cover is about φ2mm, and the actual area used for braking in the elastic shaft seal cover is only an annular area of ​​less than 0.6mm2 , plus the braking plane of the rubber parts and the end face of the wind rotor shaft are difficult to be very close, so the braking is often not sensitive enough

[0012] 2) The elastic shaft seal cover is a thin-walled part of rubber, which is prone to permanent deformation and loses its recovery ability when it is repeatedly blown by the airflow. The reliability is greatly reduced and the brake life is short.

[0013] 3) if Figure 5 As shown, when the airflow blows the elastic shaft seal cover, the shaft seal cover will be deformed in an arc shape, so that the inner hole 13 of the center lip of the elastic shaft seal cover will lose the shape of a positive cylinder, and the air circulation area will become smaller, which will affect the normal exhaust of the turbine, so that Increased air pressure on the back of the rotor blades in the rotor chamber affects the rotation speed and output power of the rotor

After the elastic shaft seal cover is repeatedly inflated, the deformation is too large, resulting in permanent deformation and loss of recovery ability

After the elastic shaft seal cover is inflated, the center hole of the lip is deformed to make the air passage smaller, which affects the rotation speed and output power of the wind rotor

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