JPH0448054B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is directed to adapting an air turbine handpiece for dental treatment used for tooth cutting and a device for preventing contamination of the inside of its operating mechanism to various types of handpieces. The present invention relates to a handpiece drive device.

[Conventional technology]

The air turbine handpiece for dental treatment that has been used in practice supplies high-pressure (2 to 4 kg/cm ² ) airflow from an external pressurized air source to the air receiving blades of an air turbine installed at the tip of the hand piece. By applying it through a pipe and discharging it from an exhaust pipe, it is rotated at high speed (approximately 400,000 revolutions per minute) and drives a cutting tool that is directly connected to the turbine. Furthermore, in order to prevent the cutting tool from heating up when the handpiece is in use and to wash away tooth debris, cooling water is sprayed from an external water source through a water pipe toward the cutting edge, and a water outlet is placed in line with the water outlet. Means is taken to atomize the cooling water using fumes from an installed chip air pack.

By the way, when using a handpiece with a cutting tool that rotates at high speed during intraoral treatment, in order to prevent dangers such as contact with the film of the cutting tool when taking it out of the mouth at the end of treatment, etc., it is necessary to feed the handpiece to the air turbine at the working position. It is customary to remove the piece from the mouth after stopping the cutting and confirming that the rotation of the cutting tool has stopped.

However, even if the supply of drive air to an air turbine rotating at high speed is stopped, the receiving blades continue to rotate for a while due to their inertia, resulting in a negative pressure inside the structure. occurs.

As a result, at the tip of the handpiece held in the working position, the cooling water adhering to the chuck of the cutting tool and other structural gaps becomes sewage containing tooth debris, saliva, blood, and difficult bacteria inside the structure. There is a risk of internal contamination due to inhalation.

Therefore, it is necessary to disinfect the handpiece after each use, but in the case of disinfection using gas, which avoids disinfection using chemical solutions or heat treatment, which would damage the delicate internal structure of the handpiece, this method does not provide sufficient sterilization. Since it takes about 2 to 3 hours for disinfection to be effective, the work efficiency is low, making it virtually impossible for medical practitioners to disinfect this type of handpiece.

However, there have been problems in preventing infectious diseases caused by viral pathogens such as hepatitis B, AIDS, and adult bacterial leukemia.

As a measure to improve the disinfection method for such handpieces, a small amount of high-pressure air is sent into the tip structure of the piece through an air supply pipe etc. even after the handpiece has finished working, and this part is maintained at a positive pressure relative to the atmosphere. A method has been proposed in which internal contamination is prevented by preventing sewage from entering through the gaps, etc., and cleaning and disinfecting the outside of the piece is sufficient.

However, when maintaining pressure is supplied by an air supply pipe or a branch pipe of a chip air pipe among conventional internal pressure maintenance means, the air supplied at this time still flows out through the exhaust pipe, so this loss is compensated for. In order to obtain the minimum effective internal pressure on the pipe, a considerable amount of air must be fed even after the work is finished, and as a result, the rotation of the air turbine, i.e. the cutting tool, cannot be completely stopped. In addition,
A large amount of air is wasted to maintain this internal pressure, which requires a powerful air pressure source.

In addition, as another configuration, when air is supplied from the exhaust pipe for internal pressure fibers, the above-mentioned outflow loss from the exhaust pipe can be prevented, but on the other hand, if the air is supplied to the exhaust pipe in the opposite direction to that during operation, Air control has to be performed, and the device configuration for this tends to be complicated and bulky.Furthermore, in terms of functionality, air continues to be supplied through the exhaust pipe, so the supplied air is not connected to the air supply pipe side. Because the flow backs up and causes the turbine to rotate in the opposite direction, it is not possible to stably stop the rotation of the cutting tool.

Furthermore, in this case, it is not possible to prevent sewage from entering the check air pipe, so separate measures must be taken to prevent this.

For these reasons, as a means of preventing contamination due to internal pressurization after the operation of this type of handpiece has stopped, it is necessary to supply the minimum amount of low-pressure air necessary to maintain internal pressure to all supply and discharge pipes, including the tip air pipe. It is effective to send them at the same time.

Therefore, the present applicant has proposed an internal contamination prevention device for a handpiece that can eliminate the drawbacks of the conventional devices mentioned above and also fully achieve the various functions required of this type of device. New patent registration application No. 146230) was filed.

On the other hand, if the currently used handpieces are roughly classified, as shown in Fig. 9A, the notch gap between the core body 3 and the outer casing 4, in which the air supply pipe 1 and the water injection pipe 2 are provided, is used as an exhaust passage. There is a 2-hole type in which the exhaust groove 5 is configured, a 3-pole type in which an independent tip air pipe 6 is further provided on the core body 3 as shown in FIG. Instead, there is a 4-hole type in which an exhaust pipe 7 serving as an exhaust passage is formed in the core body 3.

[Problem that the invention seeks to solve]

By the way, the internal contamination prevention device for the handpiece proposed earlier has an air supply circuit,
It has three circuits, a tip air circuit and an exhaust circuit, and a water supply circuit, and is configured to supply low pressure air to each of these air circuits when the handpiece is stopped to maintain the internal pressure of the piece tip structure. Therefore, the function of the 4-hole type handpiece can be fully achieved by connecting these circuits to the corresponding pipes, but other 2-hole type or 3-hole type handpieces Since the number of holes and the number of circuits are different for this type of handpiece, it cannot be applied as is.

Therefore, the present invention provides a device for preventing internal contamination that is effective for preventing internal contamination.
The object is to develop a drive device with connection means for adaptation to a hole or four-hole type handpiece.

[Means for solving problems]

In order to achieve such an object, the configuration of the present invention includes a drive air circuit for an air turbine, an exhaust circuit thereof, and a tip air circuit for spraying, and is configured to perform braking and low-pressure air supply for maintaining internal pressure at the end of operation. In an air turbine handpiece mechanism driven by an operation control device, a connection adapter is provided between the operation control device and the used handpiece, and the inside of the adapter is a ventilation path that serves as an exhaust path and a low-pressure air supply path. In addition, a circuit for connecting each circuit on the operation control device side, an air supply passage on the handpiece side, and a tip air supply passage is incorporated inside the same, and a circuit is connected to the exhaust passage and a ventilation passage inside the adapter, and when the operation is completed, The present invention is characterized in that at least low-pressure air is supplied to the exhaust passage through the ventilation passage.

[Effect]

Even if the circuit handpieces on the operation control device side have different passage configurations, the two can always be connected by using an adapter appropriate for the type of handpiece.

〔Example〕

Next, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows an embodiment of the present invention, in which an adapter a is detachably connected to a two-hole handpiece 22, a relay pipe b and a water injection pipe c, which are circuits, are provided in the adapter a, and a relay pipe b and a water injection pipe c are provided in the adapter a. Pipe b is connected to hose g via an air supply pipe d and exhaust pipe e, which are circuits, and water injection pipe c is connected to hose g via water injection pipe f. The inside of the adapter a is hollow and forms a ventilation path that serves as an exhaust path and a low-pressure air supply path.

An air supply pipe 42 as an air supply passage and a water injection pipe 43 as a water injection passage are provided in the grip main body 41 of the hand piece 22, and a tip air pipe 53 as a tip air supply passage branches off from the air supply pipe 42. .

When high-pressure air as drive air is supplied to the air supply pipe 42, this air drives the blade h to rotate the cutting tool i, and a part of the high-pressure air is supplied to the cutting tool i.
is exhausted from the outer periphery of the grip body 4, and the remaining part is the grip body 4.
The air is discharged through the hollow portion of No. 1 to the exhaust groove 44 side, which is an exhaust passage.

The cooling water supplied to the water injection pipe 43 is supplied to the cutting tool i.
The air is ejected from the tip air pipe 53 and atomized by the air ejected from the tip air pipe 53.

Relay pipe b is connected to adapter a via a bracket etc.
As shown in FIG. 2, a hollow part j is formed in this relay pipe b, and a piston k is movably inserted into the hollow part j. It is biased to the right at .

The piston k is formed with a central air passage o, ports p and qq opening into the air passage o, and lands l, m, and n.

The relay pipe b has a pipe r opening into the hollow part j,
s, t, w, x are connected. pipe r,s
is opened inside the adapter a and communicates with the exhaust groove 44, the pipe t is connected to the exhaust pipe e, and the pipe w
is connected to the air supply pipe d, and similarly, the pipe x is connected to the air supply pipe 42.

When piston k moves left and right, lands i and n open and close ports p and q, and land m opens and closes pipes s and t. That is, when the piston k moves to the left against the spring u, the port p opens to the pipe x side through the hollow part j, and the port q is cut off from the pipe r, and at this time, the pipes s and t communicate with each other. .

On the other hand, when the piston k is stroking to the right as shown in the figure, the port p is closed, the other port q is opened to the pipe r side, and the pipes s and t are blocked.

The pipes s and t may communicate with each other, but when the land m moves to the left, they communicate through the hollow part j.

Next, we will discuss the operation.

When drive air is supplied through the hose g from the actuation control device, high-pressure air is guided from the air supply pipe d through the pipe w into the relay pipe b, and this air moves the piston k to the left against the spring u. It is further guided to the pipe x via the passage o and port p in the piston k. Furthermore, the air is blown onto the blade h through the supply pipe 42 to drive it. The return exhaust air that has driven the blade h is sent to the grip body 41.
It is exhausted to the atmosphere through the hollow part, the exhaust groove 44, the inside of the adapter a, the pipe s, the hollow part of the relay pipe b, the pipe t, the exhaust pipe e, and the hose g.

At the end of the treatment, the supply of drive air is stopped, and when low-pressure air of, for example, 0.2 kg/cm ² is sent to the air supply pipe d instead, the piston k moves to the right under the pressure of the spring U that overcomes this air pressure. death,
Port q is opened to pipe r, and low pressure air is passed through passage o - port q - pipe r - inside adapter a -
The air is sprayed onto the blade h through the exhaust groove 44,
At the same time, the inside of the grip main body 41 and the inside of the adapter a are pressurized to maintain positive pressure to prevent dirty water from entering the hand piece 22.

FIG. 3 is a configuration diagram of the main parts showing another embodiment of the present invention, which is intended for a two-hole type handpiece different from that shown in FIG. There is. The handpiece is provided with a passage similar to the handpiece of FIG. In this embodiment, an adapter 45 made of a hollow case that surrounds two exhaust grooves 44 formed by cutting out the peripheral portion of the main body 41 is interposed on the proximal end surface of the main body 41, and the adapter 45 is used to connect the air flow from the actuation control device to be described later. air hose 46
Connector 47 is attached.

And these adapter 45 and connector 4
7 is connected by an appropriate means such as a conventionally known screw ring with a flange or bayonet fitting. The connector 47 also serves as an adapter, and this adapter incorporates an internal ventilation path and circuit.

That is, in the adapter 45, relay pipes 48 and 49 are arranged in a hollow interior 45a that serves as an exhaust path and a low-pressure air supply path, and connect one end of each to the end holes of the air supply pipe 42 and the water injection pipe 43. The other end is connected to the air supply pipe 50 and the water injection pipe 51 of the connector 47, and the open end of the exhaust pipe 52 in the connector 47 is made to face the hollow interior 45a, so that the hollow interior 45a itself functions as a relay air passage. It is formed into a blower. Others, 53
is a tip air pipe which is branched from the tip region of the air supply pipe 42.

Therefore, the drive air sent through the hose 46 is blown to the blades of the air turbine through the air supply pipe 50, the relay pipe 48, and the air supply pipe 42, and drives the turbine, and a portion of the air is The tip of the branched chip air pipe 53 is applied to the cooling water being spouted from the water injection pipe 43 to atomize it. The air after this blowing drive passes through the inside of the grip main body 41, passes through the exhaust groove 44, the adapter hollow interior 45a, and is discharged from the exhaust pipe 52 into the atmosphere.

When the water injection and drive air are interrupted at the end of the treatment, low-pressure air is supplied to the air supply pipe 5 instead.
0 and exhaust pipe 52 at the same time, this air is sent to the handpiece tip structure from the air supply pipe 42 and the tip air pipe 53 as described above, and the low pressure air from the exhaust pipe 52 passes through the hollow interior 45a of the adapter. Since the air flows backward through the exhaust groove 44 and is sent out to the structure, a braking action is applied to the air turbine that receives air simultaneously from the air supply pipe 42 and the exhaust groove 44, and the internal pressure of the structure is maintained at a positive pressure. This makes it possible to prevent germs from entering the area.

FIG. 4 is a configuration diagram of main parts showing another embodiment of the present invention, which includes a water supply pipe 42, a water injection pipe 43, and a dedicated chip air pipe 54.
An adapter 45 is connected to the grip main body 41 of the hole-type handpiece. The adapter 45 is connected to the actuation control device through a connector different from that shown in FIG. 3.

Therefore, the adapter 45 in this case has the air supply relay pipe 48 assembled into its hollow interior 45a.
A check valve 55 is provided for the flow of drive air, and the high pressure drive air flowing through the relay pipe 48 and the low pressure air supply pipe 56 on the connector side are provided.
A piston valve 57 is attached that uses low pressure air sent from the piston as a differential pilot pressure.

In this piston valve 57, when the pistons 58a and 58b at both ends, which are integrally connected by a rod 58, are moved to the low-pressure air side position (the position shown by the solid line in the figure), a cylinder wall located between the two pistons 58a and 58b is inserted. Exhaust relay pipe 59a and hollow interior 4
A flow path pipe 59b is opened toward 5a. The opening position in the relay pipe 59a is at the position where it is closed by the piston 58b when the pistons 58a, 58b move to the drive air side (the position shown by the solid line in the figure), and on the other hand, the The line pipe 59b is located at a position where it is connected to the air supply pipe 56 via the cylinder inner chamber.

Further, a relay pipe 60 connected to the chip air pipe 54 is configured to be connected to a chip air pipe 62 on the connector side with a one-end open switching valve 61 interposed therebetween. In addition, the first
Structural parts common to the illustrated embodiments are designated by the same symbols.

The adapter in the fourth illustrated embodiment can also be applied to a two-hole type handpiece, in which case the tip air relay tube 60 and the tip air tube 62 are unnecessary.

Therefore, when the handpiece is operated, the circuit in the adapter hollow interior 45a is in the state shown by the solid line in the same figure, and the drive air sent through the air supply pipe 50 applies its energizing force to the check valve 55 with its supply pressure. Push the air supply pipe 4 open to the left against the
At the same time, the chip air from the chip air pipe 62 reaches the chip air pipe 54 through the relay pipe 60 which is communicated with the left end closed. Water injection pipe 4
3 is connected to a water injection pipe 51.

Air injected from the air supply pipe 42 toward the air turbine passes through the exhaust groove 44, returns to the adapter hollow interior 45a, and is discharged from the flow path pipe 59b to the exhaust pipe 52 via the piston valve 57.

When the air supply from the operation control device is switched to low-pressure air due to the interruption of drive air and tip air and the interruption of water injection due to the completion of treatment, the low-pressure air is further throttled or stopped from the air supply pipe 50 on the operation control device side. In the air supply state, the check valve 55 of the relay pipe 48 moves to the right due to the energizing force and closes as shown by the solid line in the figure, while the low pressure air is supplied through the air supply pipe 56. Since the piston valve 57 directly receiving the piston moves to the left and switches to the state shown by the chain line in the figure, the exhaust relay pipe 59a is closed by the piston 58b, and the flow path pipe 59
b and the air pipe 56 are brought into communication. As a result, the adapter hollow interior 45a is pressurized by the low-pressure air flowing in from the air supply pipe 56, so that the one-end open switching valve 61 in the chip air relay pipe 60 opens the interior 45a from its open end.
The tip air pipe 62 is closed by moving to the right from the chamber pressure to the position shown by the chain line in the figure.

The low-pressure air flowing into the hollow interior 45a flows from the open end of the previously opened switching valve 61 to the relay pipe 6.
0 into the tip air pipe 54 and through the exhaust groove 44 to the tip of the handpiece.As in the case of the first illustrated embodiment, turbine braking and maintenance of the internal pressure of the tip structure are performed. This effectively works to prevent internal contamination of the area.

At this time, the air supply pipe 42 of the grip main body 41 is filled with low-pressure air that has passed through the exhaust groove 44 and reached the tip structure, and the filling pressure is applied to the piston valve 57. corresponds to the internal maintenance pressure that has decreased somewhat due to leakage into the atmosphere from the structural gap in the tip structure, and therefore, the valve 57 receives this as one pilot pressure.
This switching state can be maintained stably by the pilot pressure of the other side which directly receives low pressure air.

FIG. 5 is a configuration diagram of main parts showing still another embodiment of the present invention, in which the air supply means from the operation control device is composed of the above-mentioned air supply pipe 50 and low-pressure air supply pipe 56. The configuration of the internal circuit in the adapter 45 for the two-pole type handpiece includes the relay pipe 48 equipped with the above-mentioned check valve 55, the exhaust pipe 52, and the water injection pipe 49, as well as the hollow interior 4.
Low-pressure air feed pipe 6 opening toward 5a
2, and the outer end of the exhaust pipe 52 can be opened and closed by a manual on-off valve 63 in the connector 47. In addition, 64 indicates an exhaust notch provided in a part of the connector 47.

Therefore, the operation of the handpiece during treatment is driven by the drive air sent from the air supply pipe 50, and the return air is passed from the exhaust groove 44, the hollow interior 45a, and the exhaust pipe 52 to the manual on-off valve 63 under the open position.
It is discharged into the atmosphere through the exhaust notch 64 of the connector 47.

Then, by manually closing the on-off valve 63 at the same time as the treatment ends, the air supply relay pipe 48
When the check valve 55 is closed, the low-pressure air sent from the air supply pipe 56 reaches the exhaust groove 44 through the hollow interior 45a through the supply pipe 62.
As in the previous embodiments, this effectively works to prevent contamination by damping the turbine and maintaining the internal pressure of the tip structure.

FIG. 6 is a configuration diagram of the main parts of yet another embodiment, in which low-pressure air is supplied only by the air supply circuit in the fifth embodiment, and the exhaust pipe is replaced with a manual opening/closing mechanism. The adapter 45 is attached to the grip body 41 of a two-hole type handpiece.
A relay pipe 48 connecting between the air supply pipe 50 and the air supply pipe 42 is provided in the hollow interior 45a, and an exhaust passage opening/closing valve 66 is provided which receives the supply pressure of the relay pipe 48 as pilot pressure through a branch pipe 65. It is arranged astride the adapter 45 and connector 47.

As shown in the seventh enlarged view, the on-off valve 66 has cylindrical pistons 68a and 68b connected by a rod 67, and between the cylindrical bottom of the piston 68b and the end wall of the cylinder 69, A pressure expanding spring 70 that gives these pistons 68a and 68b a tendency to move leftward in the figure is arranged with both ends fixed, and the pilot pressure from the branch pipe 65 connected to the other end wall of the cylinder 69 is applied. Therefore, these pistons 68a and 68b are moved rightward in the figure against the movement tendency by the spring 70.

This piston 68a has a through hole 72 that communicates between the circumferential groove 71 on the outer periphery of the piston and the inside of the cylinder, and the outer periphery of the piston is in the position when the piston 68a moves to the right in the figure (the position shown by the solid line). At the same leftward movement position (position shown by the chain line), the circumferential groove 7
A through hole 73 is provided in the portion of the cylinder wall occupied by No. 1, and a through hole 74 that opens when the piston 68b moves in the left direction and both pistons 68a and 6 are provided.
A through hole 75 is bored at a position in the cylinder wall which is located in the middle of the cylinder wall 8b and is kept open at all times. Note that the through holes 72 to 75 may be formed by small holes arranged in a circumferential direction on the cylinder peripheral wall.

Other structural parts common to those of the previous embodiment are denoted by the same symbols.

The on-off valve 66, which is driven by a turbine by high-pressure drive air sent from the air supply pipe 50 when the handpiece is operated, and which uses this as pilot pressure, is in the position shown by the solid line in FIG.
Since the through hole 73 is closed and the through holes 74 and 75 are in communication, the return air after driving the turbine passes through the exhaust groove 44, the hollow interior 45a, the through hole 75, and the through hole 74, and then reaches the disconnection of the connector 47. It is released into the atmosphere from the notch 64.

When the air supply from the air supply pipe 50 is switched to low-pressure air at the end of the treatment, the air is sent to the tip of the handpiece through the air supply relay pipe 48, and the opening/closing valve 66 is activated by the movable force of the expansion spring 70. It moves to the left in FIG. 5 against the low pilot pressure and assumes the position shown by the chain line, so that the through hole 74 is closed, while the through hole 73 communicates with the circumferential groove 71, and the above-mentioned Low-pressure air from the through hole 72 of the piston 68a to the groove 71 via the branch pipe 65 is guided into the hollow interior 45a, and the exhaust groove 44
send it towards.

Therefore, in this embodiment as well, the turbine control and pollution prevention functions can be achieved in the same way as in the above-mentioned embodiments, and moreover, the exhaust path can be automatically switched.

FIG. 8 shows an example of an operation control device for driving various handpieces in this manner.

That is, in addition to the drive air circuit 10 and the chip air circuit 11, a low pressure air circuit 12 that sends a pressure of about 0.2 kg/cm ² is connected to the air switch 13.
It is located under the control of

The drive air circuit 10 is provided with an air supply shuttle valve 15 which is connected to one end and the low pressure air circuit 12 is connected to the other end with the flow rate regulating throttle 14 interposed, and an outlet of the valve 15 is provided. An air supply connector 16 is provided at.

Similarly, the tip air circuit 11 consists of a circuit that connects to a tip air connector 18 via a tip air shuttle valve 17 which is connected to one end and the low pressure air circuit 12 is connected to the other end.

For each circuit configuration on the air supply side, an exhaust circuit is configured by a three-way valve 19 for exhaust.
That is, the three-way valve 19 is connected to the drive air circuit 1.
This is a pressure-sensitive operating valve that differentially uses the air supply pressure of 0 and the air supply pressure of the low-pressure air circuit 12 as a pilot pressure. and low pressure air circuit 12
are connected to each other.

Further, the low pressure air circuit 12 is provided with an air supply connector 32 for an independent low pressure air supply path.
The air supply connector 16, the chip air connector 18, the exhaust connector 20, and the air supply connector 32 are connected to the air supply tube 23, the chip air tube 24, and the exhaust tube, which are grouped together as the air supply hose 46 (see FIG. 1). The tubes 25 are connected to each other, and the hose 46 is provided with a water supply tube 26 as a water supply circuit extending from a pressurized water source 27 toward the handpiece 22.

Additionally, reference numeral 28 indicates a noise muffling muffler attached to the discharge passage 21, 10a indicates an air supply port, 11a indicates a chip air port, and 12a indicates a low pressure air port.

A switching circuit having such a configuration is constructed as a unit structure part _U1 .
This device is constructed as a single unit with a double structure in which another unit structure U ₂ that shares the low-pressure air circuit 12 is juxtaposed with this, and there is a connection between these two structures U ₁ and U ₂ . The circuit 29 is constructed with a shuttle valve 30 interposed, and a monitoring pressure gauge 31 is attached to the outlet of the valve 30.

According to this operation control device, each valve structure is controlled by the pressure air sent into the low-pressure air circuit 12 through the drive air port 10a, the tip air port 11a, and the air switch 13 which is placed in the normal circuit state when the handpiece is operated. Under these differences in supply pressure in the body, the tip air shuttle valve 17 has its ball valve 17a connected to the low pressure air circuit 1.
2 side, the piston valve 19a of the three-way exhaust valve 19 is pushed upward to the low pressure side, and the spherical valve 15a of the air supply shuttle valve 15 is also pressed against the low pressure side valve seat in the eighth illustrated circuit. in a state.

In this state, the pressure air sent from the drive air port 10a reaches the air supply connector 16 from the drive air circuit 10 through the shuttle valve 15,
The air is supplied to an air supply tube 23 connected to the connector 16. On the other hand, the exhaust from the handpiece 22 passes through the exhaust tube 25 and the exhaust connector 20, reaches the exhaust three-way valve 19, and is discharged into the atmosphere through the muffler 28. In addition, the tip air port 11a
Pressure air sent from the chip air circuit 1
1, Shuttle valve 17, Chip air connector 1
8, supplied to the same tube 24.

When the injection of drive air, chip air, and cooling water is stopped at the end of the tooth treatment work, the shuttle valves 15, 17 and the three-way valve 19 are
is switched by the pressure supplied by the low-pressure air circuit 12, low-pressure air is sent to the chip air connector 18 via the valve 17, and low-pressure air is also sent to the exhaust connector 20 via the three-way valve 19. The air supply connector 16 is connected to the exhaust connector 20 by a flow rate adjusting throttle 14 (needle valve).
A small amount of air at a lower pressure than the amount of air (air pressure) sent to the pump is sent.

Depending on the type of handpiece used, low-pressure air is supplied from the air supply connector 32 to the handpiece side as necessary, and together with the connector 32, other connectors 16, 18, and 20 are also used depending on the model. Then close the connectors of unnecessary circuits and use the operating control device.

Note that the air switch 13 in the low-pressure air circuit 12 is normally kept open, not only when securing positive pressure inside the handpiece after completing the aforementioned handpiece work, but also when the outside of the piece is soaked in a disinfectant solution, etc. When performing disinfection and cleaning, maintaining the internal pressure under the switch circuit prevents chemical liquid from entering the piece and protects the internal mechanism from the chemical liquid. 13 to prevent unnecessary waste of pressurized air.

〔Effect of the invention〕

As described above, according to the device of the present invention, in the air turbine handpiece mechanism, the drive air circuit for driving the turbine of the operation control device, the tip air circuit for cooling water spray, and the exhaust circuit are connected to the handpiece side through the adapter. Since the air passage is connected to the tip air supply passage and the exhaust passage, in addition to proper air supply and exhaust when the handpiece is operating, it is also possible to supply low-pressure air when the handpiece is stopped, so it is possible to supply low-pressure air to the turbine after work is completed. Braking can be controlled using the pressure in the exhaust pipe. Even if there are many types of handpieces with different passage configurations, the operation control device can be connected to all the handpieces by using an adapter that matches the handpiece. Furthermore, it is possible to control the turbine and stop it, as well as maintain the internal pressure of the handpiece tip mechanism including the exhaust groove at a positive pressure to prevent contaminated liquid from entering through gaps etc.
In addition to preventing internal contamination and contamination of the entire device connected to the piece, it is also technically difficult to sterilize the inside of the piece because it is sufficient to disinfect only the outside of the piece. or,
This has the effect of eliminating inconveniences such as being subject to restrictions due to gas sterilization over a long period of time, and allowing the handpiece to be sterilized in a short time, such as by immersing the tip of the piece in a disinfectant solution. Moreover, the device of the present invention can perform such control operations in the 2-hole type and the 3-hole type.
This can be applied to various conventionally used handpieces, such as the hole type, and is extremely useful in practical use.

[Brief explanation of the drawing]

1 and 2 are configuration diagrams of essential parts showing a basic embodiment of the device of the present invention, and FIGS. 3 to 6 are diagrams of configuration of essential parts showing other embodiments of the device of the present invention, respectively. FIG. 7 is an operation diagram showing an enlarged view of the main parts of the sixth illustrated embodiment, FIG. 8 is a circuit diagram showing an example of an operation control device applied to the device of the present invention, and FIG. 9 is a conventionally used one. FIG. 3 is an end view showing various types of handpieces. Explanation of symbols, 41... Grip body, 45... Adapter, 45a... Hollow interior, 47... Connector, 4
8, 49, 59a, 60...Relay pipe, 55...Check valve, 57...Piston valve, 59b...Flow path pipe, 6
1... One end open switching valve, 62... Feed pipe, 63...
Manual opening/closing valve, 66...Exhaust passage opening/closing valve.

Claims (1)

[Claims] 1. Driven by an operation control device that has a drive air circuit for an air turbine, its exhaust circuit, and a spraying chip air circuit, and performs braking and low-pressure air supply for maintaining internal pressure at the end of operation. In the air turbine handpiece mechanism, a connection adapter is provided between the operation control device and the used handpiece, and the inside of the adapter is formed as a ventilation path that serves as an exhaust path and a low-pressure air supply path, and the inside of the adapter is A circuit is incorporated to connect each circuit on the operation control device side, an air supply passageway on the handpiece side, and a tip air supply passageway, and the exhaust passageway is connected to a ventilation passageway inside the adapter, so that at least low-pressure air is supplied to the ventilation passageway at the end of operation. A handpiece drive device characterized in that the handpiece is supplied to an exhaust passage through a passageway.