JPH0714396B2 - Air turbine hand piece drive - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a drive device for an air turbine handpiece, and in particular, chips, saliva, indoor suspended matter, and the like that scatter and float in the oral cavity when tooth cutting work is stopped. The present invention relates to an air turbine handpiece drive device that prevents foreign matter from entering the air turbine handpiece.

(Problems to be Solved by Related Art and Invention) Conventionally, in an air turbine handpiece that injects compressed air to rotate an air turbine at a high speed, a back pressure suction force due to inertial rotation of the air turbine even after the stop. Therefore, there is a problem that foreign matter such as chips and saliva that are scattered and floating in the oral cavity of the patient enter the air turbine handpiece.

In addition, even after the air turbine handpiece was stopped, dust and particles floating in the room, floating foreign matters such as bacteria, entered and adhered to the air turbine handpiece, which was unsanitary.

Therefore, due to back pressure suction or adhesion that occurs at the end of tooth cutting work or after that, foreign matter such as oral chips, saliva or indoor suspended matter enters and adheres to the air turbine handpiece and the air turbine rotating shaft, etc. There was a risk of damage to the plant and infection of the disease by pathogenic bacteria.

(Means for Solving Problems) The present invention has been made in view of the above points, and foreign matter such as cutting chips, saliva, or indoor suspended matter invading and adhering to the air turbine handpiece enters and adheres to the air turbine handpiece. The compressed air supply source, the compressed air line for driving that supplies compressed air to the air turbine handpiece, and the air discharge for discharging the air used in the air turbine. In an air turbine handpiece drive device having a pipeline, the compressed air supply pipeline from the compressed air supply source and the driving compressed air pipeline or the discharge pipeline are alternately communicated with each other. A 4-port 2-position drive switching valve that is switch-controlled by a petal-type drive main valve is installed, and discharge is performed at the switching position where the compressed air supply conduit and the drive compressed air conduit are in communication. Pipe In the switching position where the passage and the discharge port communicate with each other, the compressed air flows to rotate the air turbine, and the supply pipe line and the discharge pipe line communicate with each other, the driving compressed air pipe line is The compressed air in the supply line is blocked and is sent back to the discharge line of the air turbine through the throttle valve, and after the air turbine is stopped, the inside is always maintained in a positive pressure state. Is.

At the time of stopping the tooth cutting work, the device of the present invention is also in a positive pressure state due to a large amount of compressed air for driving the turbine in the air turbine handpiece as in the case of other known devices, and is scattered in the patient's oral cavity, There is no risk of floating chips, saliva, etc. entering the container.

However, even after the tooth cutting work is stopped, the drive switching valve 2 is switched and the low-pressure compressed air decompressed by the throttle valve 2'is returned to the air turbine 4'through the air discharge conduit 6. Since it is sent, the inside of the air turbine handpiece 4 is in a positive pressure state.

Therefore, according to the air turbine handpiece driving device of the device of the present invention, foreign matter such as chips, saliva, or indoor suspended matter that are scattered or floating in the oral cavity can be prevented in this way.

(Operation) In the air turbine handpiece driving device of the present invention, when the tooth cutting work is stopped and the supply of the driving compressed air to the handpiece is stopped (the compressed air supply pipe line 5 and the discharge pipe line). 6), the low-pressure compressed air decompressed by the throttle valve 2'of the switching valve is in the air turbine 4 '.
Therefore, the back pressure suction force that is normally generated due to the inertial rotation of the air turbine 4 ′ is canceled, and at the same time, the low pressure compressed air is continuously fed back to the inside of the turbine head portion 7. Keep positive pressure.

As a result, foreign matter such as chips, saliva, or indoor suspended matter that are scattered or floating in the oral cavity is prevented from entering and adhering to the air turbine handpiece.

Further, even when the handpiece after the driving is stopped is placed on the holder, the turbine head can be continuously maintained at the positive pressure, so that the foreign matters such as dust and bacteria floating in the room are not generated in the air turbine. It is possible to prevent it from entering and adhering to the inside of the handpiece.

(Embodiment) FIG. 1 is a circuit diagram illustrating an operating state of an air turbine handpiece drive device according to an embodiment of the present invention, and FIG. 2 is a circuit diagram illustrating a stopped state of FIG.

In FIG. 1, 1 is a compressed air supply source, 2 is a drive switching valve, 3 is a petal-type drive main valve, 4 is an air turbine handpiece, 5 is a compressed air supply line, and 5'is a drive compression. An air conduit, 6 is an air discharge conduit.

The compressed air supply source 1 and the drive switching valve 2 are connected by a compressed air supply pipe line 5, and a drive compressed air pipe line 5 ′ is provided between the drive switching valve 2 and the air turbine handpiece 4. Air discharge pipes 6 are arranged in parallel. In addition, the middle of the compressed air supply pipeline 5 and the pilot port of the drive switching valve 2 are connected by control compressed air pipelines 9 and 9 ′ equipped with a petal type drive main valve 3.

The drive switching valve 2 of the present apparatus is a 4-port 2-position valve with an atmosphere opening port having a throttle valve 2 '.
During the tooth cutting operation, the compressed air supply conduit 5 is communicated with the driving compressed air conduit 5 ′ by inputting the control compressed air from the driving main valve 3 to rotate the air turbine 4 ′ at a high speed. . Also, when work is stopped,
As shown in FIG. 2, the main drive valve 3 returns to the old position, the pipe 5 communicates with the air discharge pipe 6 through the throttle valve 2 ′, and the compressed air decompressed by the throttle valve 2 ′ becomes air. As a result of being sent back to the turbine 4 ′, the inside of the head portion 7 of the air turbine handpiece 4 is in a positive pressure state, and foreign matter such as chips, saliva or indoor suspended matter that scatters and floats in the oral cavity enters the head portion 7. , No adhesion will occur.

The air turbine handpiece 4 has a pore portion 8 communicating with the atmosphere in the head portion 7, and a part of the compressed air supplied from the driving compressed air pipeline 5 ′ or the air discharging pipeline 6. Alternatively, all of them are released to the atmosphere from the pores 8.

At the start of the tooth cutting operation, when the petal-type drive main valve 3 which is normally closed is pressed and opened, the control compressed air is driven from the compressed air supply source 1 through the control compressed air pipelines 9 and 9 '. Press the auxiliary valve (pilot valve) of the switching valve 2 for
The output port of the valve 2 is switched to a switching device that connects the compressed air supply conduit 5 and the driving compressed air conduit 5 ', and the air turbine 4'is rotated at high speed.

In FIG. 2, when the pressing of the petal-type drive main valve 3 is released after the tooth cutting work is stopped, the compressed control air in the pipe line 9'pressing the auxiliary valve of the drive switching valve 2 is released by the valve. Three
Is released from the atmosphere opening port of the valve 2, the auxiliary valve of the valve 2 is restored, and the output port is switched to the switching position for connecting the compressed air supply pipe line 5 and the discharge pipe line 6 to the pipe line 6. And the conduit 5'is closed.

As a result, the compressed air decompressed by the throttle valve 2'is sent back to the air turbine 4 '.

(Effects of the Invention) As described in detail in the following examples, the device of the present invention includes a compressed air supply source, a compressed air duct for driving that supplies compressed air to an air turbine handpiece, and an air used in the air turbine. In an air turbine handpiece drive device having an air discharge pipeline for discharging the compressed air supply pipeline from the compressed air supply source, and the compressed air pipeline for driving or the discharge pipeline. A 4-port 2-position drive switching valve, which is switched and controlled by a petal-type drive main valve so as to communicate with either of them alternately, is provided, and the compressed air supply pipeline and the compressed air pipeline for communication are communicated with each other. In the switching position where the discharge pipe line communicates with the discharge port, compressed air flows so as to rotate the air turbine, and in the switching position where the supply pipe line communicates with the discharge pipe line. , Drive compression The air pipeline is closed, the compressed air in the supply pipeline is sent back to the discharge pipeline of the air turbine through a throttle valve, and the inside is always maintained in a positive pressure state after the air turbine is stopped. Is.

As a result, foreign matter such as chips, saliva, bacteria, or indoor suspended matter that are scattered or floating in the oral cavity is prevented from invading and adhering to the air turbine handpiece, and damage to the air turbine rotating shaft, etc., diseases caused by pathogenic bacteria, etc. It can prevent infection.

[Brief description of drawings]

FIG. 1 is a circuit diagram illustrating an operating state of the air turbine handpiece drive device of the present invention, and FIG. 2 is a circuit diagram illustrating a stopped state of FIG. 1 ... Compressed air supply source, 2 ... Drive switching valve, 2 '...
Throttle valve, 3 ... Petal drive main valve, 4 ... Air turbine handpiece, 4 '... Air turbine, 5 ... Compressed air supply conduit, 5' ... Driving compressed air conduit, 6 …
... Air discharge pipe line, 7 ... head part, 8 ... pore part,
9, 9 '... Compressed air pipeline for control

Claims (1)

[Claims] 1. A compressed air supply source, a drive compressed air pipeline for supplying compressed air to an air turbine handpiece, and an air discharge pipeline for discharging air used in the air turbine. In the air turbine handpiece drive device, a compressed air supply conduit from the compressed air supply source,
The compressed air supply is provided with a 4-port 2-position drive switching valve which is switched and controlled by a petal type drive main valve so as to alternately communicate with either the drive compressed air line or the discharge line. At the switching position where the working pipe line and the driving compressed air pipe line communicate with each other, the discharge pipe line and the discharge port communicate with each other, and compressed air flows to rotate the air turbine, and the supply pipe line. At the switching position where the passage and the discharge pipe are communicated with each other, the drive compressed air pipe is closed, and the compressed air in the supply pipe is sent back to the discharge pipe of the air turbine through the throttle valve, An air turbine handpiece drive device characterized in that the inside of the air turbine is always maintained in a positive pressure state after the air turbine is stopped.