WO2018193798A1

WO2018193798A1 - Dental treatment apparatus

Info

Publication number: WO2018193798A1
Application number: PCT/JP2018/012454
Authority: WO
Inventors: 稔菅野; 太郎菅野; 高畑　興邦; 圭祐中村; 長谷川　和男
Original assignee: 株式会社エーゼット
Priority date: 2017-04-21
Filing date: 2018-03-27
Publication date: 2018-10-25
Also published as: JPWO2018193798A1

Abstract

This dental treatment apparatus 1 includes: a handset 2 that has a hollow tip portion 21 which ejects sterile water; a tank 3 that stores the sterile water; a pump 6; a first flow path 4 through which the sterile water that is delivered to the handset 2 from the tank 3 via a pump 6 flows; a second flow path 5 through which the sterile water bypasses the pump 3 and flows when returning to the tank 3 from the handset 2; a valve 7 that is positioned along the second flow path 5; and a control unit 8. At least a portion of the first flow path 4 between the pump 6 and the handset 2 is formed from an elastic member that elastically deforms in response to the difference in pressure of the sterile water between when the pump 6 is operating and when the pump 6 is not operating. The control unit 8 keeps the valve 7 in a closed state during the operation period of the pump 6 and opens the valve 7 when the operation period of the pump 6 ends.

Description

Dental treatment equipment

The present invention relates to a dental treatment device that discharges sterilized water to an affected area in the oral cavity.

As a method for treating periodontal disease, a treatment method is known in which bactericidal water is sprayed onto the affected area in the oral cavity to sterilize periodontal pathogens in plaque and the like. The dental treatment apparatus used in this treatment method includes a tank in which sterilized water such as hydrogen peroxide is stored, and a nozzle that discharges sterilized water supplied from the tank to the affected area.

On the other hand, in Patent Document 1 below, a vibration part that vibrates by a vibrator that generates ultrasonic vibrations, a chip part that is connected to the vibration part and transmits ultrasonic vibrations, and a germicide is released from the chip part. There has been proposed a dental treatment device including a flow path and an optical system for irradiating a laser beam that photodecomposes a disinfectant from a tip portion. By irradiating laser light to the bactericidal agent released from the tip portion to the affected area, hydroxyl radicals having a bactericidal effect against pathogenic bacteria are generated, so that periodontal disease can be effectively treated.

Japanese Patent Laid-Open No. 2015-12877

By the way, in the conventional dental treatment apparatus described above, in order to make it easy for the practitioner to perform treatment, the handset provided with the tip portion is provided with sterilized water via a tube formed of a relatively flexible material such as an elastomer. Is supplied. A pump is generally used to supply sterilizing water to the tip portion. Therefore, when the back pressure of the sterilizing water sent from the pump to the tip portion increases, the tube may expand. In a typical conventional dental treatment apparatus, since the back pressure is sufficiently small compared with the hardness of the tube, the expansion of the tube is negligible, and its influence is almost negligible. However, the back pressure of the sterilizing water is higher than usual when the flow path of the tip portion is narrowed to pass an optical fiber or the like as in the dental treatment device described in Patent Document 1 described above, for example. Therefore, there is a possibility that the amount of expansion of the tube becomes a size that cannot be ignored. Also, when the flow rate or flow rate of sterilizing water is increased according to the selection of the treatment method, the amount of expansion of the tube may increase due to the increase in back pressure.

If the expansion amount of the tube becomes too large, the amount of contraction of the tube when the pump stops and the back pressure decreases will also increase, so sterilized water pushed out of the tube with the contraction can leak out from the tip of the tip part There is sex.

This invention is made | formed in view of this situation, The objective is to provide the dental treatment apparatus which can make it difficult to leak sterilization water from a chip | tip part, when discharge | release of sterilization water is stopped. .

A dental treatment device according to one aspect of the present invention includes a handset including a hollow tip part that discharges sterilized water to an affected area in the oral cavity, a tank in which the sterilized water is stored, and the sterilizer in the tank. A pump that pumps water to the handset, a first flow path through which the sterilizing water pumped from the tank to the handset flows, and the sterilizing water that bypasses the pump and returns from the handset to the tank. A second flow path; a valve provided in the middle of the second flow path; and a control unit configured to control opening and closing of the valve. At least a part of the first flow path between the pump and the handset is formed by an elastic member that is elastically deformed according to a difference in pressure of the sterilizing water between when the pump is activated and when it is stopped. The control unit keeps the valve closed during the operation period of the pump, and opens the valve when the operation period of the pump ends.

According to the dental treatment apparatus, since the valve is kept closed during the operation period of the pump, the sterilizing water is sent to the handset through the first flow path. At this time, since the pressure of the sterilizing water increases between the pump and the handset, at least a part of the first flow path formed by the elastic member expands. When the pump is stopped, the pressure of the sterilizing water sent out from the pump is lowered, so that the expanded first flow path contracts. However, since the valve is opened at this time, the sterilizing water pushed out by contraction of the first flow path returns to the tank through the second flow path. This makes it difficult for the sterilizing water to leak from the tip portion.

Preferably, the control unit may close the valve when a predetermined time elapses after the operation period of the pump ends.

According to this configuration, when the predetermined time elapses after the pump is stopped, the second flow path is blocked by the valve. Accordingly, the sterilizing water does not flow out from the tank to the tip portion via the second flow path.

Suitably, the said control part may change the length of the said predetermined time according to the flow volume information regarding the flow volume of the said sterilization water when the operation period of the said pump is complete | finished.

According to this configuration, the time during which the second valve is closed is adjusted according to the flow rate of the sterilizing water when the operation period of the pump ends. For example, the predetermined time is adjusted so that the time for the closed state is lengthened when the flow rate of the sterilizing water is large, and the time for the closed state is shortened when the flow rate of the sterilizing water is small. Thereby, leakage of the sterilizing water due to the elastic deformation after stopping the pump, and leakage of the sterilizing water due to the sterilizing water flowing from the tank to the handset via the second flow path, respectively It becomes easy to be suppressed.

Preferably, the control unit may keep the valve open during the stop period of the pump.

According to this configuration, it is possible to control the operation and stop of the pump and the opening and closing of the valve by a common signal, and the control of the control unit is simplified.

Preferably, the tank may include a main tank that stores the sterilizing water, and a sub tank in which the sterilizing water that flows from the main tank to the pump is temporarily stored. The inside of the sub tank may be at atmospheric pressure, and the second flow path may be connected to the sub tank.

According to this configuration, when the valve is opened as the pump is stopped, the handset and the sub tank are connected via the second flow path. Since the inside of the sub tank is at atmospheric pressure, the sterilizing water easily returns to the sub tank.

Preferably, the dental treatment device may include an optical fiber that transmits a laser beam that is inserted into the sterilizing water flow path in the tip portion and irradiated to the sterilizing water emitted from the tip portion.

According to this configuration, the sterilizing effect of the sterilizing water released from the tip portion is enhanced.

According to the present invention, it is possible to make it difficult to leak the sterilizing water from the tip portion when the discharge of the sterilizing water is stopped.

FIG. 1 is a block diagram schematically showing a configuration of a dental treatment apparatus according to an embodiment of the present invention. FIG. 2 is an enlarged vertical cross-sectional view showing a tip portion of the handset. FIG. 3 is an enlarged longitudinal sectional view showing a state where the main tank is being attached to the sub tank. FIG. 4 is an enlarged longitudinal sectional view showing a state where the main tank is attached to the sub tank.

Hereinafter, a dental treatment apparatus according to an embodiment of the present invention will be described.
FIG. 1 is a block diagram schematically showing a configuration of a dental treatment apparatus 1 according to an embodiment of the present invention. FIG. 2 is an enlarged longitudinal sectional view showing a portion of the tip portion 21 of the handset 2 in the dental treatment apparatus 1 shown in FIG. FIG. 3 is an enlarged longitudinal sectional view showing a state in the middle of attachment of the main tank 30 to the sub tank 31 in the dental treatment apparatus 1 shown in FIG. FIG. 4 is an enlarged longitudinal sectional view showing a state where the main tank 30 is attached to the sub tank 31.

(overall structure)
A dental treatment device 1 according to an embodiment of the present invention is a device used for treatment of periodontal disease and the like. As shown in FIG. 1, the dental treatment device 1 is a hollow tip portion that discharges sterilizing water such as hydrogen peroxide solution to an affected part in the oral cavity (such as a gap between a tooth and a gum on which dental plaque adheres). The handset 2 including 21, the tank 3 in which the sterilized water is stored, the pump 6 that sends the sterilized water in the tank 3 to the handset 2, and the sterilized water that is sent from the tank 3 to the handset 2 through the pump 6 flows. A first flow path 4, a second flow path 5 through which sterilized water returns from the handset 2 to the tank 3, bypassing the pump 6, a valve 7 provided in the middle of the second flow path 5, and opening / closing of the valve 7 And a control unit 8 for controlling.

(Handset 2)
As shown in FIG. 2, the handset 2 has a tubular conduit portion 20 connected to the tip portion 21. The conduit portion 20 forms a flow path 20 A through which sterilizing water flows, and is connected to the first flow path 4. The conduit part 20 guides the sterilizing water supplied from the first flow path 4 to the chip part 21.

The tip portion 21 is a metal nozzle formed in a tapered shape, and the middle is bent in a substantially L shape as shown in FIG. Since the middle of the tip portion 21 is bent in an L shape, the tip of the tip portion 21 is easily inserted into the patient's oral cavity. A sterilizing water discharge port 21a is formed at the tip of the tip portion 21, and the sterilizing water can be discharged from the sterilizing water discharge port 21a to the affected part such as between teeth. The sterilizing water discharge port 21a is formed with a small diameter so that the sterilizing water can be vigorously released to the affected part, and has a small opening area.

As shown in FIG. 2, the first optical fiber 23 is inserted into the sterilizing water flow path 21 A formed by the tip portion 21. The first optical fiber 23 transmits laser light output from a laser light source (not shown). The sterilizing water discharged from the chip part 21 is irradiated with this laser light. The first optical fiber 23 is made of, for example, resin, and is inserted into the chip portion 21 along the flow path 21A. The tip of the first optical fiber 23 reaches the sterilizing water discharge port 21a and faces the outside from the sterilizing water discharge port 21a. Since the first optical fiber 23 is thus inserted, the sterilizing water flow path 21A in the vicinity of the sterilizing water discharge port 21a of the tip portion 21 is very narrow.

The second optical fiber 24 is inserted into the sterilizing water flow path 20 A formed by the conduit section 20. The second optical fiber 24 is made of, for example, quartz, and the tip thereof is coupled to the base end of the first optical fiber 23 with the optical axis aligned.

A vibration part 22 that generates ultrasonic vibrations is attached to the base end part of the chip part 21. By causing the tip portion 21 to vibrate ultrasonically, it is possible to efficiently remove plaque, tartar and the like of the affected area.

(Tank 3)
As shown in FIGS. 3 and 4, the tank 3 includes a main tank 30 in which sterilizing water is stored, and a sub tank 31 in which sterilizing water flowing from the main tank 30 to the pump 6 is temporarily stored. A main tank 30 is detachably attached to the sub tank 31. The inside of the sub tank 31 is at atmospheric pressure.

The main tank 30 has a main tank body 32 formed of polyethylene or the like. In the main tank main body 32, sterilized water is stored in an airtight manner. A plug member 33 is attached to the end of the main tank main body 32 (the lower end in FIGS. 3 and 4) for preventing the sterilizing water from leaking out during transport. The plug member 33 has a cylindrical plug body 33A, and a sterilizing water discharge port 33B is formed at the center of the tip of the plug body 33A. An on-off valve 9 is incorporated in the plug body 33A.

As shown in FIG. 3, the on-off valve 9 has a disc-like valve portion 9A that reciprocates within the plug body 33A to open and close the sterilizing water discharge port 33B, and a stem portion 9B that supports the valve portion 9A. One end of the stem portion 9B is fixed to the valve portion 9A, and is located on the opposite side of the sterilizing water discharge port 33B with the valve portion 9A interposed therebetween. The stem portion 9B is supported by an annular guide portion 33C provided in the plug body 33A so as to be capable of moving forward and backward with respect to the sterilizing water discharge port 33B.

As shown in FIG. 3, the on-off valve 9 has a compression coil spring 9C provided on the outer periphery of the stem portion 9B. The compression coil spring 9C is sandwiched between the valve portion 9A and the guide portion 33C. The valve portion 9A is constantly urged in a direction to close the sterilizing water discharge port 33B by the compression coil spring 9C.

As shown in FIG. 3, the guide portion 33C is formed with a through-hole 33D that communicates the main tank body 32 and the plug body 33A. The sterilizing water stored in the main tank body 32 flows into the plug body 33A through the through hole 33D. When the valve portion 9A of the on-off valve 9 is lifted, the sterilizing water stored in the main tank main body 32 flows out from the sterilizing water discharge port 33B.

As shown in FIG. 3, the sub tank 31 includes a bottomed sub tank main body 34 and an annular lid member 34 A attached to the upper opening of the sub tank main body 34. A mounting port 34B for attaching the main tank 30 to the sub tank 31 is formed in the center of the lid member 34A. Further, a through hole 34C is formed in the lid member 34A so that the inside of the sub tank main body 34 becomes atmospheric pressure when the main tank 30 is attached to the sub tank 31.

At the center of the bottom of the sub-tank main body 34, a valve operating stem 34D that pushes up the valve portion 9A of the on-off valve 9 of the main tank 30 when the main tank 30 is attached to the sub-tank 31 is erected. A discharge port 34 E connected to the first flow path 4 and the second flow path 5 is formed at the bottom of the sub tank body 34.

When the main tank 30 is attached to the sub tank 31, as shown in FIG. 3, the main tank 30 is moved in the direction of arrow A in FIG. 3 so that the plug member 33 is on the lower side, and the plug member 33 of the main tank 30 is moved to the sub tank. 31 is inserted into the mounting opening 34B of the lid member 34A. Then, as shown in FIG. 4, the valve portion 9A of the on-off valve 9 contacts the tip of the valve operation stem 34D and is lifted against the urging force of the compression coil spring 9C. When the valve portion 9A of the on-off valve 9 is lifted, the sterilizing water in the main tank main body 32 flows into the sub tank main body 34 from the sterilizing water discharge port 33B.

(First channel 4 and second channel 5)
As shown in FIG. 1, the first flow path 4 includes a flow path 41 that connects the tank 3 and the pump 6, and a flow path 42 that connects the pump 6 and the handset 2. In the example of FIG. 1, the second flow path 5 includes a flow path 51 branched from the flow path 41 and connected to the valve 7, and a flow path 52 branched from the flow path 42 and connected to the valve 7. Among these flow paths, at least a part of the flow path 42 connecting the pump 6 and the handset 2 is an elastomer having an appropriate flexibility so that the handset 2 can be freely handled during treatment. Hose or the like is used. That is, at least a part of the flow path 42 is formed by an elastic member. Therefore, the elastic member forming the flow path 42 is elastically deformed according to the difference in the pressure of the sterilizing water between when the pump 6 is activated and when it is stopped.

In addition, the other part (flow

path

42, 51, 52) in the 1st flow path 4 and the 2nd flow path 5 may be formed with comparatively hard members, such as resin and a metal, and elasticity, such as an elastomer, is used. You may form with the member which has, and these members may be combined and formed.

(Pump 6)
As shown in FIG. 1, the pump 6 includes a pump main body 61 and a motor 62. When the motor 62 rotates and drives an impeller (not shown) of the pump body 61, the pump body 61 is operated, and the sterilizing water in the first flow path 4 is sent out from the tank 3 toward the handset 2. Note that the pump 6 is not limited to a system that rotationally drives the impeller, but may be another system.

(Control unit 8)
The control unit 8 is a device that controls the overall operation of the dental treatment apparatus 1 and includes, for example, a computer that executes processing according to a program stored in a storage device. The control unit 8 may execute all processing by a computer and a program, or may execute at least part of processing by dedicated hardware (logic circuit).

The control unit 8 is responsive to a control command input from an input device (not shown) (button, switch, rotary knob, touch panel, operation key, etc.) or another control device (host controller connected via a network, etc.). The operation of the pump 6, the valve 7, the vibration unit 22, and the laser light source (not shown) is controlled. For example, when a control command is input so as to execute discharge of sterilizing water from the tip portion 21, irradiation of laser light, and ultrasonic vibration of the tip portion 21, the control portion 8 rotates the motor 62 of the pump 6. Then, control is performed so as to oscillate the vibration unit 22 and output laser light from the laser light source. Further, the control unit 8 may adjust the driving force of the pump 6, the magnitude of vibration in the vibration unit 22, and the intensity of the laser light output from the laser light source in accordance with the input control command.

When the control unit 8 operates the pump 6 according to the input control command, the control unit 8 keeps the valve 7 closed during the operation period of the pump 6. In addition, when the control unit 8 stops the pump 6 according to the input control command, the control unit 8 opens the valve 7 when the operation period of the pump 6 ends. When the valve 7 is opened at the end of the operation period of the pump 6, the control unit 8 closes the valve 7 when a predetermined time elapses after the operation period of the pump 6 ends.

(Operation)
Next, the operation of the dental treatment apparatus will be described.
In order to treat the patient, the therapist performs a predetermined operation for operating the device in an input device (not shown) or the like. When an operation command corresponding to this operation operation is input from an input device or the like, the control unit 8 operates the pump 6 in accordance with the input operation command and outputs a laser beam from a laser light source (not shown). Then, the vibration unit 22 of the handset 2 is ultrasonically vibrated.

The controller 8 keeps the valve 7 closed during the operation period of the pump 6. When the operation command is input, the control unit 8 maintains the valve 7 in the closed state if the valve 7 has already been closed, and closes the valve 7 if the valve 7 has been opened. Then, the pump 6 is operated.

When the pump 6 is activated, the sterilizing water in the sub tank 31 is sent to the handset 2 via the first flow path 4. At this time, since the second flow path 5 is blocked by the valve 7, the sterilizing water does not recirculate from the outlet of the pump 6 to the inlet through the second flow path 5. The sterilizing water sent to the handset 2 passes through the flow path 21A in the tip part 21 and is discharged to the outside from the sterilizing water discharge port 21a formed at the tip of the tip part 21. Thereby, sterilization water is discharge | released toward a patient's affected part.

When the sterilizing water is discharged from the sterilizing water discharge port 21 a of the tip part 21, the back pressure of the sterilizing water increases in the flow path from the pump 6 to the tip part 21 of the handset 2. In the example shown in FIG. 2, the sterilizing water discharge port 21 a of the tip portion 21 is formed with a small cross-sectional area, and the first optical fiber 23 is inserted into the tip portion 21. 21A is very narrow. Therefore, the back pressure of the sterilizing water during the operation of the pump 6 becomes considerably high. Due to the influence of this high back pressure, the flow path 42 (elastomer hose or the like) formed of an elastic member expands.

After the treatment of the affected area, the therapist performs a predetermined stop operation for stopping the apparatus using an input device (not shown). When a stop command corresponding to this stop operation is input from an input device or the like, the control unit 8 stops the pump 6 according to the input stop command and stops the output of laser light from a laser light source (not shown). In addition, the ultrasonic vibration in the vibration unit 22 is stopped.

When the pump 6 is stopped, the back pressure of the sterilizing water sent from the pump 6 to the handset 2 is rapidly reduced. When the back pressure of the sterilizing water decreases, the elastic member of the flow path 42 that has expanded contracts, and this contraction force becomes a force for sending out the sterilizing water. The sterilizing water pushed by the contraction force of the flow path 42 tends to flow to the sterilizing water discharge port 21 a of the tip portion 21. Therefore, the control unit 8 opens the valve 7 when the operation period of the pump 6 ends, so that the sterilizing water can return to the tank 3 side in the second flow path 5.

When the valve 7 is opened and the second flow path 5 is opened, the sterilized water pushed by the contraction force of the flow path 42 returns to the sub tank 31 via the second flow path 5. Since the inside of the sub tank 31 is at atmospheric pressure, and the second flow path 5 is sufficiently wider than the flow path 21A of the tip portion 21, most of the sterilizing water pushed by the contraction force of the flow path 42 is obtained. It is collected in the sub tank 31. Therefore, even if the flow path 42 contracts when the operation of the pump 6 is stopped, the sterilizing water does not easily leak from the sterilizing water discharge port 21a of the tip portion 21.

When a predetermined time has elapsed since the operation period of the pump 6 has ended, the control unit 8 closes the valve 7. Thereby, the sterilizing water flowing out from the sub tank 31 to the handset 2 through the second flow path 5 is blocked. Therefore, for example, sterilization water can be prevented from leaking from the sterilization water discharge port 21a of the tip portion 21 due to a siphon phenomenon or the like.

As described above, according to the dental treatment device 1 according to the present embodiment, the pressure (back pressure) of the sterilizing water between the pump 6 and the handset 2 by sending the sterilizing water from the pump 6 to the handset 2. Therefore, at least a part of the first flow path 4 formed by the elastic member expands. When the pump 6 is stopped, the pressure of the sterilizing water sent out from the pump 6 is lowered, so that the expanded first flow path 4 is contracted. However, since the valve 7 is opened at this time, the sterilized water pushed out by the contraction of the first flow path 4 returns to the tank 3 through the second flow path 5. Accordingly, it is possible to make it difficult to leak the sterilizing water from the tip portion 21 when the discharge of the sterilizing water is stopped. Moreover, since the sterilizing water can be reused by returning the sterilizing water to the tank 3, wasteful disposal of the sterilizing water can be reduced.

Further, according to the dental treatment device 1 according to the present embodiment, since the valve 7 is kept closed during the operation period of the pump 6, the outlet 6 of the pump 6 is connected to the inlet via the second flow path 5. The sterilized water does not reflux. Thereby, since the sterilization water in the sub tank 31 can be stably sent out to the handset 2 side, the sterilization water can be stably discharged from the sterilization water discharge port 21a of the tip portion 21.

Further, according to the dental treatment device 1 according to the present embodiment, when the valve 7 is opened as the pump 6 is stopped, the handset 2 and the sub tank 31 are connected via the second flow path 5. Since the inside of the sub tank 31 is at atmospheric pressure, the sterilizing water easily returns to the sub tank 31. Thereby, the leakage of the sterilizing water from the tip part 21 can be made less likely to occur.

Furthermore, according to the dental treatment apparatus 1 according to the present embodiment, the second flow path 5 is blocked by the valve 7 when a predetermined time has elapsed since the operation period of the pump 6 has ended. As a result, the sterilizing water does not flow out from the tank 3 to the tip portion 21 via the second flow path 5, so that the tip portion 21 in the stop period of the pump 6 is compared with the case where the valve 7 is left open. It is possible to make it difficult to cause leakage of sterilizing water from the water.

The present invention is not limited to the embodiment described above. That is, those skilled in the art may make various modifications, combinations, subcombinations, and alternatives regarding the components of the above-described embodiments within the technical scope of the present invention or an equivalent scope thereof.

For example, in the above description of the embodiment, an example in which the time from the end of the operation period of the pump 6 to the closing of the valve 7 (hereinafter referred to as “valve opening time”) is constant is described. The embodiment is not limited to this example. In one modification of the present embodiment, the control unit 8 may change the valve opening time. For example, the control unit 8 may change the valve opening time according to the flow rate information regarding the flow rate of the sterilizing water when the operation period of the pump 6 ends.

The flow rate information is, for example, a control command related to the driving force of the pump 6 that is input to the control unit 8 from an input device or the like. The control unit 8 performs control to adjust the driving force of the pump 6 according to this control command (flow rate information), thereby adjusting the flow rate of the sterilizing water. For example, the controller 8 lengthens the valve opening time stepwise or continuously as the flow rate set in the flow rate information increases. When the flow rate of the sterilizing water is large, the back pressure of the sterilizing water increases and the amount of expansion of the first flow path 4 increases, so that the amount of contraction of the first flow path 4 accompanying the stop of the pump 6 also increases. The amount of sterilizing water pushed out from the flow path 4 increases. In this case, by increasing the valve opening time, it becomes easy to stably return the sterilizing water pushed out from the first flow path 4 to the tank 3, so that the leakage of the sterilizing water from the tip portion 21 is hardly caused effectively. be able to. Conversely, as the flow rate set in the flow rate information decreases, the valve opening time is shortened stepwise or continuously, so that the sterilizing water flowing from the tank 3 to the handset 2 via the second flow path 5 is easily blocked. Therefore, the sterilizing water flowing through the second flow path 5 can also be made difficult to leak from the tip portion 21.

Further, in a modification of the present embodiment, the control unit 8 may keep the valve 7 open during the stop period of the pump 6. Thus, the operation and stop of the pump 6 and the opening and closing of the valve 7 can be controlled by a common signal, so that the control of the control unit 8 can be simplified.

In the example of FIG. 1, the second flow path 5 is indirectly connected to the sub tank 31 via the first flow path 4. However, in a modification of the present embodiment, the second flow path 5 is directly connected to the sub tank 31. It may be connected.

In the example of FIG. 1, the sterilizing water returns to the tank 3 via the second flow path 5, but in a modification of the present embodiment, the sterilized water is separated into the other tank separated from the first flow path 4. The second flow path 5 may be connected.

In the example of FIG. 2, the first optical fiber 23 is inserted into the chip unit 21, but in one modification of the present embodiment, the optical fiber may not be inserted into the chip unit 21.

1 ... Dental treatment device 2 ... Handset 3 ... Tank 30 ... Main tank 31 ... Sub tank 4 ... 1st flow path 5 ... 2nd flow path 6 ...・・ Pump 7 ・・・・・・・・・・・ Valve 8 ・・・・・・・・・・ Control unit 21 ・・・・・・・・・・・ Tip unit 22 ・・・・・・・・・・・Oscillating part 23 ... 1st optical fiber 24 ... 2nd optical fiber

Claims

A handset including a hollow tip part that discharges sterilized water to the affected area in the oral cavity;
A tank in which the sterilized water is stored;
A pump for sending the sterilizing water in the tank to the handset;
A first flow path through which the sterilized water is sent from the tank to the handset via the pump;
A second flow path through which the sterilizing water flows around the pump and returns from the handset to the tank;
A valve provided in the middle of the second flow path;
A control unit for controlling the opening and closing of the valve,
At least a part of the first flow path between the pump and the handset is formed by an elastic member that is elastically deformed according to a difference in pressure of the sterilizing water between when the pump is activated and when it is stopped. ,
The control unit keeps the valve closed during the operation period of the pump, and opens the valve when the operation period of the pump ends.
Dental treatment device.
The control unit closes the valve when a predetermined time has elapsed after the operation period of the pump ends.
The dental treatment apparatus according to claim 1.
The control unit changes the length of the predetermined time according to flow rate information related to the flow rate of the sterilizing water when the operation period of the pump ends.
The dental treatment apparatus according to claim 2.
The control unit keeps the valve open during the pump stop period,
The dental treatment apparatus according to claim 1.
The tank
A main tank in which the sterilizing water is stored;
A sub-tank for temporarily storing the sterilizing water flowing from the main tank to the pump,
The inside of the sub tank is at atmospheric pressure,
The second flow path is connected to the sub tank;
The dental treatment device according to any one of claims 1 to 4.
An optical fiber that transmits a laser beam that is inserted into the sterilizing water flow path in the tip portion and irradiated to the sterilizing water emitted from the tip portion;
The dental treatment apparatus according to any one of claims 1 to 5.