JPH0723980A - Dental hand piece - Google Patents

Abstract

PURPOSE:To prevent cross infection and to extend the life of a bearing by which a rotor is freely rotatably supported by preventing adhesion and aspiration of chips and contaminants. CONSTITUTION:In a hand-piece head portion 1, the rotor shaft 3 of a rotor 2 is supported at its upper and lower sides by a bearing 4 and the rotor 2 is designed to freely rotate. A support member 5 for supporting the bearing 4 is provided inside the hand-piece head portion 1 with an O-ring 6 between the member 5 and the portion 1. An exhaust circuit 7 comprising a plurality of grooves is formed among the inside wall of the hand-piece head portion 1, the support member 5 and the O-ring 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention prevents a dental treatment machine from being contaminated by pathogenic bacteria and bacteria from a handpiece through a joint hose, and also prevents suction of cutting powder to be incorporated in the handpiece. The present invention relates to a dental handpiece having a long life.

[0002]

2. Description of the Related Art Conventionally, a dental handpiece is one in which a rotor installed in a head portion thereof and rotatably supported by a bearing is rotated by driving air to perform cutting treatment. Then, the air after rotating the rotor was exhausted by returning from the joint hose to the dental treatment machine through the inside of the exhaust hole in the handpiece.

[0003]

However, the above-mentioned conventional dental handpiece has the following drawbacks. In other words, during the cutting treatment, the suction action due to the rotation of the rotor occurs, and the cutting powder and contaminants in the patient's mouth are sucked or attached to the head through the gap between the head and the rotor shaft or the hole for attaching and detaching the bar. Will end up.
As a result, there is a risk of cross infection to other patients.
In addition, cutting powder may enter the bearings that rotatably support the rotor, causing malfunctions.

Therefore, the present invention was developed in view of the above-mentioned drawbacks of the prior art. By preventing the adhesion and suction of cutting powder and contaminants, it is possible to prevent cross-infection to other patients. The purpose of the present invention is to provide a dental handpiece that can extend the life of the bearing.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a dental handpiece for cutting and treating a rotor, which is installed in a head portion of a handpiece and is rotatably supported by a bearing, by rotating with compressed air. An exhaust circuit for the compressed air, which is composed of a groove or a passage, is formed in the piece head portion.

According to the present invention, the exhaust circuit for the compressed air is formed in the handpiece head portion, and the air film is formed on the handpiece head portion by the exhaust air, so that the adhesion and suction of cutting powder and contaminants can be prevented. it can.

[0007]

Embodiment 1 FIGS. 1 and 2 show the present embodiment, FIG. 1 is a sectional view of a handpiece head portion, and FIG. 2 is AA ′ of FIG.
It is a line sectional view. Reference numeral 1 denotes a handpiece head portion. Inside the handpiece head portion 1, a rotor shaft 3 of a rotor 2 is supported by bearings 4 above and below, and the rotor 2 is configured to be rotatable. A support member 5 that supports the bearing 4 is provided in the handpiece head portion 1 via an O-ring 5. An exhaust circuit 7 including a plurality of grooves is formed between the inner wall of the handpiece head portion 1 and the lower support member 5 and O-ring 6.

In the handpiece having the above structure, the compressed air after rotating the rotor 2 passes through the exhaust circuit 7,
The air is exhausted from the gap 8 between the lower part of the handpiece head part 1 and the lower part of the rotor shaft 3 to form an air film 9.

According to this embodiment, since the air film is formed by the exhausted compressed air, it is possible to prevent the adhering and suction of the cutting powder and the pollutant, and prevent the cross infection to other patients. At the same time, the life of the bearing that rotatably supports the rotor can be extended.

[0010]

Embodiment 2 FIGS. 3 and 4 show this embodiment, FIG. 3 is a sectional view of a handpiece head portion, and FIG. 4 is BB 'of FIG.
It is a line sectional view. Handpiece head portion 11 of this embodiment
Differs from that of the first embodiment in that an exhaust circuit 12 similar to the exhaust circuit 7 is provided above the handpiece head unit 1 as well, and the other components are the same. Are denoted by the same reference numerals and description of the configuration is omitted.

In the handpiece having the above-described structure, the compressed air after rotating the rotor 2 passes through the exhaust circuit 7 and the exhaust circuit 12, and the bar of the head cap 13 above and below the handpiece head portion 11 is attached and detached. The air is exhausted from the holes 14 and forms air films 9 on the upper and lower sides, respectively.

According to this embodiment, by forming the air films above and below the handpiece head portion, it is possible to further prevent the adhesion and suction of cutting powder and contaminants as compared with the first embodiment. It is possible to prevent cross-infection of the patient and to extend the life of the bearing that rotatably supports the rotor.

[0013]

[Embodiment 3] FIGS. 5 to 8 show this embodiment, FIG. 5 is a sectional view of the handpiece head portion, FIG. 6 is a sectional view taken along the line CC ′ of FIG. 5, and FIG. 7 is a sectional view of the handpiece head portion. FIG. 8 is a sectional view, and FIG. 8 is a sectional view taken along the line DD ′ of FIG. 7. The handpiece head portions 21 and 22 of this embodiment have a structure similar to that of the above-described first embodiment, and the exhaust circuit 7 composed of a plurality of grooves is eliminated, and instead the exhaust circuit 23 and 24 composed of a plurality of holes are formed. The other points are the same, and the same numbers are given to the same components to omit the description of the configurations.

The handpiece having the above structure has the same operation as that of the first embodiment, and the description of the operation will be omitted.

According to this embodiment, the same effect as that of the first embodiment can be obtained.

In this embodiment as well, it is needless to say that exhaust circuits may be provided above and below the handpiece head portions 21 and 22 as in the case of the second embodiment.

[0017]

As described above, according to the dental handpiece of the present invention, the handpiece head is provided with the exhaust circuit including the grooves or holes for exhausting the compressed air for driving the rotor, By forming the air film on the piece head, it is possible to prevent adhesion and suction of cutting powder and contaminants. Therefore, cross infection to other patients can be prevented, and the life of the bearing that rotatably supports the rotor can be extended.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a handpiece head portion showing a first embodiment.

FIG. 2 is a sectional view taken along the line AA ′ of FIG.

FIG. 3 is a cross-sectional view of a handpiece head portion showing a second embodiment.

FIG. 4 is a sectional view taken along line B-B ′ of FIG.

FIG. 5 is a cross-sectional view of a handpiece head portion showing a third embodiment.

6 is a cross-sectional view taken along the line C-C ′ of FIG.

FIG. 7 is a cross-sectional view of a handpiece head portion showing a third embodiment.

8 is a cross-sectional view taken along the line D-D ′ of FIG. 7.

[Explanation of symbols]

 1 Handpiece Head Part 2 Rotor 3 Rotor Shaft 4 Bearing 5 Supporting Member 6 O-Ring 7 Exhaust Circuit 8 Gap 9 Air Film 11 Handpiece Head Part 12 Exhaust Circuit 13 Headcap 14 Hole 14 21 Handpiece Head Part 22 Handpiece Head Part 23 Exhaust circuit 24 Exhaust circuit

Claims (1)

[Claims] 1. A dental handpiece for cutting treatment by rotating compressed air to rotate a rotor installed in a handpiece head part and rotatably supported by a bearing,
A dental handpiece characterized in that an exhaust circuit for the compressed air is formed in the head portion of the handpiece, the exhaust circuit comprising a groove or a passage.