JPH0638984A - Dental handpiece - Google Patents

Abstract

PURPOSE:To achieve a prevention of infective diseases by a method wherein a rotary blade to be driven by compressed air is supported with a bearing on one end side thereof and a cutting tool is provided integral with a spindle of the rotary blade to make a handpiece disposable with the simplification of the construction thereof. CONSTITUTION:This handpiece is arranged to integrate a head case 20 housing a rotary blade 10 to be rotated with the supply of compressed air and a body in which an air supply path 24 and an exhaust path 22 are formed. The rotary blade 10 is fitted into a rotating shaft 16 supported with one bearing 14 at an intermediate part and a tip end part made to stick out from a head 34 of the rotating shaft 16 is formed as cutting tool 18. This eliminates a complicated and costly chuck mechanism thereby enabling the providing of a handpiece disposable at a low cost.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a dental air turbine handpiece.

[0002]

2. Description of the Related Art Dental air turbine handpieces are
A bearing that supports the rotor and its shaft in a rotatable state,
It consists of a chuck mechanism for attaching the cutting tool and a water circuit for cooling the cutting tool.

Such a dental air turbine handpiece has a complicated and expensive chuck mechanism for mounting a cutting tool, and the chuck mechanism holds the cutting tool so that it does not fall out.

However, such a chuck mechanism is
Frequent replacement of the cutting tool or long-term use causes wear or failure, resulting in falling out or loosening of tightening. In addition, the stable rotation of the cutting tool is not obtained, which causes the runout of the core.
For this reason, there is a possibility that firm safety cannot be obtained. Further, bearings are provided at both ends of the rotary blade, which hinders downsizing of the head of the handpiece.

Water is mainly used as the cooling fluid for the cutting tool of the dental air turbine handpiece, but in the case of water cooling, the mechanism on the unit side sucks dirty water into the handpiece and Bacteria and infectious pathogens may propagate inside the body. For this reason, some water valves in the body of the handpiece are provided with a complicated mechanism such as a check valve to prevent this, but this also causes the handpiece to be expensive. The water for cooling the cutting tool also becomes a spray during treatment, which also hinders the operator's visual field.

Due to such a complicated structure, the dental air turbine handpiece is very expensive, so that it will be used for a long period of time, and it will be difficult to maintain a clean state. is there. Therefore, the development of a safer and easier-to-use dental handpiece has been eagerly awaited.
Since there are several types of cutting tools that the surgeon actually uses on a daily basis, a disposable handpiece seems to be most suitable.

[0007]

The problem to be solved by the present invention is that the dental air-turbine handpiece is very expensive due to its complicated internal structure, so that it is difficult to solve the problem for a long period of time. Since it is used over a long period of time and it is difficult to maintain a clean state, it is an objective to develop an inexpensive and disposable type for preventing infectious diseases.

In order to reduce the manufacturing cost, it is possible to remove a complicated and expensive chuck mechanism for mounting a cutting tool, avoid the risk of the cutting tool coming off or loosening due to wear or failure, and obtain a firm safety. It is to be able to do so, and to stabilize the rotation of the cutting tool to eliminate the cause of runout.

Furthermore, since water is used for cooling the cutting tool, the problem of contamination of the handpiece body due to bacteria and infectious disease bacteria due to suction of dirty water is solved, and the obstruction of the visual field during surgery due to water mist is eliminated. Is.

[0010]

SUMMARY OF THE INVENTION The present invention is directed to removing the complex and expensive chucking mechanism for mounting a cutting tool, including the rotor spindle and the cutting tool contained within the dental handpiece head. The main feature is that the shaft and the shaft are integrated to be common, and a ball bearing type bearing inner ring portion is integrally molded on the common shaft.

Further, by using the exhaust air of the compressed air after driving the handpiece to cool the cutting tool, the water circuit is eliminated, and bacteria of the handpiece body due to suction of dirty water, infectious pathogens, etc. It eliminates the risk of contamination and further ensures a clear view during treatment.

As described above, it is possible to provide a small-sized, inexpensive disposable product by simplifying the inside of the handpiece.

[0013]

1 is a cross-sectional view of one embodiment of the present invention, which is composed of a handpiece head 34, an air supply passage 24 and an exhaust passage 22 of a main body, and has an extremely simplified internal structure. Therefore, it is a disposable dental handpiece that can be manufactured at low cost.

FIG. 2 is an enlarged sectional view of the head of FIG. 1. The rotary blade 10 and the cutting tool 18 have a common rotary shaft 16, and the rotary shaft 16 is fitted to the rotary blade 10. The rotating shaft 16 is rotatably supported by the ball bearing 14.

Further, the rotary blade 10 is driven by the air compressed by the external compressor being jetted out through the air supply passage 24, and the compressed air which has been used for driving the rotary blade 10 is discharged through the exhaust passage 22. It is sent back to the main body. A part of the discharged compressed air is injected into the cutting tool 18 as a cooling fluid for the cutting tool 18 through the cooling air passage 26.

FIG. 3 is an enlarged cross-sectional view of the head of an embodiment in which the rotary shaft and the inner ring of the ball bearing are integrally formed. The rotary shaft 16 is provided with an inner ring portion 28 corresponding to the inner ring of the ball bearing. A ball bearing is formed by 30 and the outer ring 32 to support the rotating shaft 16 in a rotatable state.

[0017]

According to the dental handpiece of the present invention, the cutting tool and the rotor blade main wheel are integrated, and the bearing is set on one end side of the rotor blade. Furthermore, the inner ring of the ball bearing type bearing is also the main shaft. Since it is integrated with, the complicated and expensive chuck mechanism can be eliminated, and usually 300,000 to 500,
000r. p. Since a stable rotation balance of the cutting tool rotating at m can be obtained, the life of the bearing supporting the rotary blade main shaft can be sufficiently maintained by one.

The elimination of the chuck mechanism by the integration of the shaft and the setting of the bearing at one end of the rotary blade make the head of the handpiece extremely compact, which is a permanent issue for dental handpiece makers. It can make a great contribution to the partial treatment and pediatric dental treatment.

Further, since the water circuit is also removed for cooling the exhaust gas, the risk of contamination of bacteria and infectious pathogens due to suction of sewage is eliminated, and a vacuum for sucking drainage from the patient's mouth is also unnecessary. Further, during the treatment, the water mist for cooling the cutting tool which obstructs the visibility disappears, and a clear visual field can be obtained.

As a result of the above, the inside of the handpiece is simplified, resulting in a cheaper product, which can be supplied as a disposable dental handpiece for preventing infectious diseases.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of one embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of the head of FIG.

FIG. 3 is an enlarged sectional view of the head of an embodiment in which the cutting tool shaft, the rotary blade shaft, and the inner ring of the ball bearing bearing are integrally molded.

[Explanation of symbols]

 10 Rotor Blade 12 O-ring 14 Ball Bearing 16 Rotating Axis 18 Cutting Tool 20 Head Case 22 Exhaust Passage 24 Air Supply Passage 26 Cooling Air Passage 28 Inner Ring 30 Bearing Ball 32 Bearing Outer Ring 34 Handpiece Head 36 Spindle

Claims (4)

[Claims] 1. A dental handpiece having a rotary blade housed in the head of the dental handpiece, which is driven by compressed air, is used with a cutting tool, and has an injection port for cooling the cutting tool with a fluid. In a dental handpiece, supported in a rotatable state by a bearing on one end side of the rotary blade,
A dental handpiece characterized in that the main axis of the rotary blade and the axis of the cutting tool are connected without a chuck mechanism. 2. The dental handpiece according to claim 1, wherein the main shaft of the rotary blade and the shaft of the cutting tool are integrally formed. 3. The dentistry according to claim 2, wherein a ball bearing type inner ring portion is integrally formed on a shaft on which the main shaft of the rotary blade and the shaft of the cutting tool are integrally formed. For handpiece. 4. A dental tool characterized in that a fluid used for cooling the cutting tool is used to cool the cutting tool by using exhaust of compressed air after driving the rotary blade. Handpiece.