JPH0212976Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a medical/dental treatment instrument that can inject air, water, or both.

(Structure of conventional example and its problems) Conventionally, medical and dental treatment instruments capable of spraying pressurized air, pressurized water, or both have been used to treat teeth, etc. There are handpieces for cutting the affected area, syringes for washing and drying the affected area, etc. For example, in medical/dental treatment equipment that includes an air supply path that supplies pressurized air and a water supply channel that supplies pressurized water, there is a supply control valve for air supply and a supply control valve for water supply. When the valve is opened, the air and water supplied from the air supply source and water supply source to the air supply path and water supply channel of the medical and dental treatment equipment via the air supply pipe and water supply pipe built into the hose are supplied to the medical and dental treatment equipment. - Air or water is injected from the nozzle at the tip of the dental treatment instrument, and when the supply control valve of the air supply source or the supply control valve of the water supply source is opened individually, air or water is injected individually from the nozzle. By the way, if the ventilation of pressurized air and the flow of pressurized water are abruptly shut off by the respective supply control valves,
The pressure inside the air supply pipe and air supply path, as well as inside the water supply pipe and water supply path, becomes lower than atmospheric pressure temporarily, and water adhering to the vicinity of the injection port is discharged from the injection port along with the air into the air supply path and the water supply channel. It is sucked into the water supply channel, but in this water,
It also includes sewage that has bounced back from affected areas. Therefore, at the start of injection, sewage that has entered the air supply path and water supply channel is injected onto the affected area, and air is removed from the air supply pipe and air supply path and water supply pipe and water supply channel that have been contaminated with pathogens, etc. Medical and dental treatment instruments had the disadvantage of becoming a source of secondary infection, such as by spraying water onto the affected area.

(Purpose of the invention) The purpose of the invention is to prevent water adhering to the vicinity of the injection port from being sucked into the air supply path and water supply channel when pressurized air and pressurized water are shut off. Our goal is to provide medical and dental treatment instruments with the highest quality.

(Structure of the invention) The invention is one in which a check valve is installed in the air supply path and water supply channel near the injection port.

(Description of Embodiment) FIGS. 1 and 2 show the configuration of an embodiment of the present invention, and 1 indicates, for example, an air turbine (not shown) and a rotary shaft attached to the rotating shaft of the air turbine. An air turbine handpiece 4 has a chuck installed in the head part 2 and a power supply pipe (not shown) installed in the grip part 3; The air supply passage 9 is connected to an air supply source (not shown) via an air supply pipe 8 whose rear end is installed in the hose 7, and whose tip end has an injection port 10 connected to the head mounting neck 6.
A water supply channel 12 is connected to a water supply source (not shown) through a water supply pipe 11 whose rear end is installed in the hose 7 and which protrudes from the vicinity of the head part 2 and is connected to the injection port 5.
A check valve is installed in the air supply passage 4 near the injection port 10 and in the water supply channel 9 near the injection port 10, 13 is a valve box with a valve seat 14 at the rear (see Fig. 2), 15 is a valve box The valve body 13 is movably inserted into the valve body 13, and the spring 16 is interposed between the tip of the valve box 13 and the valve body 15. This spring 16 moves the valve body 15 backward (to the right in the figure).
is biased to bring the valve body 15 into close contact with the valve seat 14.

In this embodiment configured in this way, the supply control valve (not shown) of the air supply source and the supply control valve (not shown) of the water supply source are respectively closed, and air and water are supplied to the air supply path 4 and the water supply path 9. When the valve body 15 is not being supplied to the valve seat 14 due to the tension of the spring 16, the check valve 12 is also closed. or,
When the supply control valve (not shown) of the air supply source and the supply control valve (not shown) of the water supply source are respectively opened and air and water are supplied to the air supply channel 4 and the supply channel 9, the tension force of the spring 16 increases. The pressure of air and water that can withstand the above is applied to the valve body 15, the valve body 15 separates from the valve seat 14, the check valve 12 also opens, and air and water are jetted out from the injection ports 5 and 10, respectively. The cutting tool 17 held in the chuck and the cutting part are cooled. Then, when the supply control valve of the air supply source and the supply control valve of the water supply source are respectively closed and the supply of air and water to the air supply path 4 and the water supply path 9 is cut off, the air supply path 4
Due to the suction force due to the pressure drop inside the water supply channel 9 and the tension force of the spring 16, the valve body 15 is moved to the valve seat 14.
The check valve 12 is also closed. Therefore, the atmosphere flows from the injection ports 5 and 10 to the air supply path 4 and the air supply path 9.
The water that is no longer sucked into the air supply path 4 and adheres to the vicinity of the injection ports 5 and 10 also flows from the injection ports 5 and 10 to the air supply path 4.
and will no longer be sucked into the water supply channel 9. Furthermore, when the supply control valve of the air supply source or the supply control valve of the water supply source is opened and closed individually, one of the check valves 12 remains closed, but the other one opens and closes as described above, so that the supply control valve of the air supply source is When the supply control valve or the supply control valve of the water supply source is closed, the check valve 12 is also closed, and the water adhering to the vicinity of the injection port 5 or 10 is also removed from the injection port 5 or 10.
This prevents the air from being sucked into the air supply path 4 or the air supply channel 9.

FIG. 3 also shows the configuration of another embodiment of the present invention, in which the same reference numerals as those in FIGS. 1 and 2 indicate the same parts, and 18 indicates an injection port at the tip. 19, a valve storage part 23 that houses a normally closed air supply control valve 21 and a normally closed water supply control valve 22, and a grip that connects the hose 7 to the rear end. The syringe 25 is integrally formed with the part 24 as shown in the figure, and the tip opening is connected to the injection port 1.
9 and has a check valve 12 interposed in the middle thereof, and this injection pipe 25 is installed inside the nozzle part 20. 26 is an air supply path which has one end connected to the injection pipe 25 and the other end to the air supply pipe 8 of the hose 7, with a supply control valve 21 interposed in the middle; 27, one end connected to the injection pipe 25
The other end is connected to the water supply pipe 11 of the hose 7, and the supply control valve 22 is interposed in the middle part. There is. Reference numeral 28 denotes a lever for opening the supply control valve 21, which is swingably mounted on the upper part of the valve storage part 23, and 29 is a supply control valve 22, which is swingably mounted on the upper part of the valve storage part 23 in line with the lever 28. This is the lever for opening.

In this embodiment configured as described above, when the supply control valve 21 of the air supply source and the supply control valve 22 of the water supply source are respectively closed and air and water are not supplied to the injection pipe 25, the spring 16 is expanded. By force,
The valve body 15 is in pressure contact with the valve seat 14, and the check valve 12 is also closed. Also, by selectively pressing one or both of the levers 28 and 9, the supply control valve 21 and the supply control valve 22 are opened, and the injection pipe 25 is opened.
When one or both of air and water is supplied to the valve body 15 , the pressure of air and water that can resist the tension force of the spring 16 is applied to the valve body 15 , and the valve body 15 presses against the valve seat 1 .
4, the check valve 12 also opens, and air and water are ejected from the injection port 19 to dry or clean the affected area. Then, when the pressure on the levers 28 and 29 is released and the supply control valve 21 and the supply control valve 22 are closed to cut off the supply of air and water to the injection pipe 25, the suction force due to the pressure drop in the injection pipe 25 is released. Due to the tension of the spring 16, the valve body 15 is brought into pressure contact with the valve seat 14, and the check valve 12 is also closed. For this reason, the air is no longer sucked into the injection pipe 25 from the injection port 19, and water adhering to the vicinity of the injection port 19 is also removed from the injection port 19.
9 and is no longer sucked into the injection pipe 25.

(Effect of the invention) As explained above, according to the invention, when the air or water supply pressure becomes lower than a predetermined pressure, the valve body is activated by the spring means to open the air or water supply side opening of the valve box. Although the valve closes immediately, the pressure in the air supply line or water supply line is still higher than atmospheric pressure. As a result, sewage adhering to the vicinity of the injection port is no longer sucked into the air supply path or water supply channel, and the inside of the air supply path or water supply channel is no longer contaminated with pathogenic bacteria. This has the advantage of preventing medical treatment instruments from becoming a source of secondary infection.

In addition, even if sewage, etc. flows into the air supply path or water supply channel from the injection port when the medical/dental treatment equipment is not in use, the inflow of sewage, etc. should be removed by injection into the air supply path or water supply channel. Since the check valve near the mouth prevents contamination of the handpiece's air supply path or the entire water supply channel or the hose's air supply path or water supply channel, cleaning of the handpiece, hose, etc. , which has the advantage of simplifying sterilization work.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of an embodiment of the present invention, Fig. 2 is a sectional view of a check valve in an embodiment of the invention, and Fig. 3 is a sectional view of a check valve in an embodiment of the present invention.
The figure is a configuration diagram of another embodiment of the present invention. 1... Hand piece, 4, 26... Air supply path,
5, 10, 19...Injection port, 7...Hose, 8...
... Air supply pipe, 9, 27 ... Water supply channel, 11 ... Water supply pipe, 12 ... Check valve, 18 ... Syringe, 21,
22... Supply control valve, 25... Injection pipe.

Claims (1)

[Scope of claim for utility model registration] Medical and dental treatment that is equipped with an air supply path and/or a water supply path, and is capable of injecting air, water, or both. The device includes a valve box having a movable valve body therein, and a valve body that presses the valve body against an air or water inflow side opening of the valve body when the supply pressure of air or water becomes lower than a predetermined pressure. A medical/dental treatment instrument characterized in that a check valve comprising a spring means for immediately closing the valve is provided in the air supply path or the water supply channel near the injection port.