JPH09140731A - Hand piece for compressed air driven type dental wash and suction provided with disposable syringe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To omit or reduce sterilizing processing by generating negative pressure in a sucking path when an air exhausting path is opened by operating a cutoff valve, sucking liquid into the liquid chamber of syringe, supplying compressed air and injecting liquid. SOLUTION: An operating ring 80 is held at an idle position, the needle tip of syringe is immensed on medicinal liquid, and compressed air is supplied. The compressed air is jetted from a jet nozzle 66 of ejector pump 52 toward an axial air exhausting path 76, and negative pressure is generated in a sucking path 94. Thus, the floating piston of syringe is moved back and the medicinal liquid is sucked into the liquid chamber. Medicinal liquid sucking speed is controlled by adjusting the idle position of operating ring 80 by turning a stopper ring 90. Next, when compressed air is supplied by closing a cutoff valve 86 by moving the operating ring 80 forth, since a radial air exhausting path 78 is closed, compressed air flows back through the sucking path 96 as shown by an arrow. Thus, the floating piston of syringe is moved forward and medicinal liquid is injected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dental cleaning suction handpiece for cleaning a cavity of a tooth, a root canal and a periodontal tooth with a chemical solution and sucking the cleaning solution in a dental treatment. More specifically, the present invention is capable of being equipped with a disposable syringe, and is adapted to drive the syringe by the action of compressed air to perform suction and delivery of a liquid medicine, for compressed air-driven dental cleaning suction. Regarding the handpiece.

[0002]

2. Description of the Related Art Japanese Patent Publication No. 30369/1993 has a suction pump of an ejector type, which is adapted to suck a chemical solution or the like from a suction tube at the tip by a negative pressure generated by the action of compressed air. A handpiece is disclosed. A backflow valve is provided in this handpiece, and the clogging of the suction tube is blown off by causing the compressed air of the ejector pump to flow back into the suction tube.

[0003]

In this suction handpiece, since the suction passage extends inside the handpiece, when the infected cavity or root canal is washed with a chemical solution and the used chemical solution is aspirated. , The suction passage inside the handpiece is contaminated with bacteria and pus. Therefore, after use, the entire handpiece must be sterilized by an autoclave disinfecting device, which requires time and labor for management.

Another drawback of this suction handpiece is that the operation button of the check valve is arranged at a predetermined angular position in the circumferential direction of the handpiece, so that the suction tube is desired regardless of the posture of the dentist. The tip of the handpiece must be connected to the handpiece via a swivel joint to direct it to any angular position. Therefore, the structure is complicated, the number of parts is large, and the handpiece is expensive.

On the other hand, in the prior art, a disposable manual syringe is known. Since this type of manual syringe is disposable for each patient, infection between patients can be avoided, and it has the advantage of being hygienic. The disposable manual syringe includes a cylinder and a plunger formed of plastic or the like.

In order to suck a chemical solution such as hydrogen peroxide solution or sodium hypochlorite solution from the container using a manual syringe, usually, the cylinder is held by the left hand and the plunger is pulled by the right hand. Next, the drug solution is delivered by holding the syringe in the right hand and pushing the plunger with the thumb of the right hand. Furthermore, in order to dry the cavity and the root canal by sucking the used chemical from the cavity and the root canal that have been washed with the chemical solution in this way, change hands again, hold the cylinder with the left hand, and hold with the right hand. You have to pull the plunger. Therefore, both hands are required for the operation, and the operation is troublesome, and it is difficult to quickly perform the dental treatment because the syringe must be changed.

It is an object of the present invention to provide a compressed air driven dental cleaning suction handpiece that does not contaminate the internal air passages and therefore can eliminate or reduce the sterilization process. . Another object of the present invention is to provide a compressed air-driven dental washing suction handpiece capable of sucking and injecting a chemical solution with only one hand operation. Still another object of the present invention is to provide a compressed air-driven dental washing suction handpiece capable of quickly and easily sucking and injecting a liquid medicine. In another aspect, an object of the present invention is to mount a disposable syringe, to drive the disposable syringe by using compressed air to perform suction and injection of a drug solution, and to simplify the structure. An object of the present invention is to provide an inexpensive compressed air driven dental cleaning suction handpiece.

[0008]

According to the invention, a compressed air supply hose from the dental unit is connected to the rear end of the handpiece. A disposable syringe is detachably attached to the other end of the handpiece. This disposable syringe includes a cylinder and a floating piston slidably fitted in the cylinder, and the floating piston divides the inside of the cylinder into a liquid chamber and an air chamber. The handpiece contains an ejector pump that produces a negative pressure by injecting compressed air. This ejector pump has an injection nozzle communicating with the compressed air supply hose, an exhaust passage communicating with the atmosphere, and a suction passage communicating with the air chamber of the syringe.
The handpiece is provided with a shutoff valve that opens and closes the exhaust passage of the ejector pump.

When the exhaust passage is opened by operating the shutoff valve, the negative pressure generated in the suction passage causes the floating piston of the syringe to retreat to suck the liquid into the liquid chamber of the syringe. On the other hand, when the exhaust passage is closed, the compressed air injected from the injection nozzle flows backward into the air chamber through the suction passage to advance the floating piston and eject the liquid in the liquid chamber.

After use, the disposable syringe may be removed from the handpiece and discarded. Since the inside of the cylinder of the disposable syringe is separated into the liquid chamber and the air chamber by the floating piston, even if the pus and the like are sucked into the liquid chamber together with the liquid medicine, the air system inside the air chamber and the handpiece is contaminated. There is no. Therefore, as long as the used syringe is replaced with a new syringe, the next patient can be immediately treated without sterilizing the handpiece.

Since the suction and injection of the drug solution can be performed by operating the operation member of the shutoff valve with a finger while holding the handpiece with one hand, a series of procedures for sucking, injecting, and re-sucking the drug solution are performed with one hand. It can be done quickly and easily only by the operation.

In a preferred embodiment, the shut-off valve has an annular actuating member which extends circumferentially along the outer circumference of the handpiece. With such a configuration, the shutoff valve can be operated regardless of the rotational angle position of the handpiece, and the swivel joint of the related art can be eliminated. Therefore, the handpiece of the present invention has a simple structure, a small number of parts, and can be manufactured at low cost. The above-mentioned features and effects of the present invention, as well as other features and advantages, will be made clear by the description of the following embodiments.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 and 2, a compressed air driven irrigation and suction dental handpiece device 10 is shown.
Includes a handpiece 12, a disposable syringe 14 is detachably attached to the tip of the handpiece 12, and a compressed air supply hose 16 from a dental unit (not shown) is detachably connected to the rear end of the handpiece 12. It For this reason,
A female member 18 of a conventional one-touch joint is formed at the rear end of the handpiece, and a male member 20 of the one-touch joint attached to the tip of the compressed air supply hose 16 can be fitted in a known manner. ing.

As the syringe 14, a luer lock type disposable syringe manufactured by Nipro Medical Engineering Co., Ltd. can be preferably used. As shown in FIG. 3, the disposable syringe of the same company includes a plastic cylinder 22 and a plastic plunger 24, and an elastomer piston 26 is attached to the tip of the plunger 24. A disposable needle 2 for dental treatment is provided at the tip of the cylinder 22.
8 (commercially available under the name of Clean Washing Needle from the same company) can be attached by screwing. This needle 28 can be bent and used at any desired angle as shown in FIG. Alternatively, any other commercially available disposable dental needle may be used.

For the purposes of the present invention, the manually operated plunger 24 of a commercially available disposable syringe is not needed, only the piston 26 is utilized as a floating piston. Therefore, the piston 26 is separated from the plunger 24, and as shown in FIG. 4, only the piston 26 is mounted in the cylinder 22 in a freely movable state. Alternatively, the tip of the plunger 24 and the piston 26 may be cut with scissors or the like before use. By fitting the floating piston 26 in the cylinder 22, the inside of the cylinder is divided into a liquid chamber 30 and an air chamber 32.

As shown in FIG. 3, in a commercially available luer lock type disposable syringe 14, a flange 34 for engaging a finger has a diametrically opposed peripheral edge portion cut out in a chord shape, and Arc-shaped peripheral portion 36 facing the
And chordal sides 38 adjacent to them. In the preferred embodiment of the present invention, the commercially available disposable syringe 14 is removably attached to the handpiece 12 by utilizing such a shape of the flange 34.

For this reason, a syringe holder 40 is provided at the tip of the handpiece 12. As can be seen from FIGS. 4, 5 and 6, this syringe holder 4
0 has a pair of diametrically opposed pawls 42 complementary to the chordal notches in the flange 34. Each nail 4
The reference numeral 2 includes a partially cylindrical wall 44 circumscribing the arc-shaped peripheral portion 36 of the flange 34 with a minute clearance, and a crescent-shaped wall 46 extending radially inward from the wall 44. An annular groove is formed in the end surface 48 of the syringe holder 40, and an O-ring 50 is fitted therein.

Therefore, as shown in FIG.
While compressing, the flange 34 of the syringe 14 is pressed against the end surface 48 of the syringe holder 40,
When rotated by 0 degrees, the arcuate peripheral edge portion 36 of the flange 34 engages with the claw 42 as shown in FIG. 6, and the disposable syringe 14 is easily attached to the handpiece 12. When disposing of the used syringe 14,
It may be rotated once and removed from the syringe holder 40.

FIG. 7 shows an example of the structure of the handpiece 12. Referring to FIG. 7, an ejector type jet pump 52 is arranged in the handpiece 12. In the illustrated embodiment, the handpiece 12 has a substantially columnar main body 54 and a nozzle forming member 56 fixed to the main body, and the main body 54 and the nozzle forming member 56 form an ejector pump 52. The shoulder portion of the nozzle forming member 56 is brought into contact with the shoulder portion 58 of the main body 54, an outer threaded collar 60 is screwed onto the main body 54, and a fixing ring 64 abutting against the flange 62 of the nozzle forming member 56 is attached to the rear portion of the collar 60. The nozzle forming member 56 is positioned with respect to the main body 54 by being screwed into the inner screw of the.

The nozzle forming member 56 includes the handpiece 12
A compressed air jet nozzle 66 is formed along the axis of. A shaft hole 68 is formed in the rear portion of the nozzle forming member 56 so that the male member 20 (FIG. 2) of the one-touch joint is fitted therein. The female member 18 of the one-touch joint described above is configured by the shaft hole 68 and the fixing ring 64. In the general one-touch joint shown in FIG. 2, the male member 20 of the one-touch joint is configured so that the pressurized water is supplied from the axial passage and the compressed air is supplied from the port 70 opened to the side. ing. In order to fit such a popular one-touch joint, the nozzle forming member 56 is formed with an axial passage 72 offset radially outward from its axis and a diametric passage 74 communicating with the axial passage 72. I am doing it. The compressed air injection nozzle 66 communicates with this diametrical passage 74, and the upper end of the diametrical passage 74 is closed by a blind plug. Therefore, as shown in FIG. 1, when the male member 20 of the one-touch joint is connected to the rear end of the handpiece 12 and the compressed air is sent from the dental unit to the compressed air supply hose 16, the compressed air is jetted from the jet nozzle 66. To be done.

The ejector pump 52 includes the injection nozzle 6
Negative pressure is generated by compressed air injected from 6,
The pressure of the compressed air is directly transmitted to the air chamber 32 of the syringe 14. Therefore, the main body 54 has an axial exhaust passage 76 that is aligned and opposed to the injection nozzle 66.
A radial exhaust passage 78 communicating with the axial exhaust passage 76 is formed. The axial exhaust passage 76 has a diameter larger than the diameter of the injection nozzle 66, and its inlet is formed in a tapered shape.

The radial exhaust passage 78 is open to the outer periphery of the main body 54 and is opened and closed by an operation ring 80 slidably fitted on the outer periphery of the main body 54.
An annular groove 82 facing the radial exhaust passage 78 is formed on the inner periphery of the operation ring 80. The annular groove 82 is formed in the operation ring 80 at a plurality of axial passages 84 formed at equal intervals in the circumferential direction. Through the atmosphere. The operating ring 80 cooperates with the main body 54 to form a shutoff valve 86 that opens and closes the radial exhaust passage 78. As shown in FIG.
When the operating ring 80 is located at a position where the annular groove 82 of the operating ring 80 is aligned with the radial exhaust passage 78, the compressed air flow injected from the injection nozzle 66 into the axial exhaust passage 76 is directed to the radial exhaust passage 78 and the annular groove. 82 and axial passage 8
It is discharged to the atmosphere via 4. As shown in FIG. 8, when the operation ring 80 is displaced to the left in the figure, the operation ring 8
An inner peripheral wall 88 of 0 closes the opening of the radial exhaust passage 78. A stopper ring 9 is provided on the outer periphery of the right end of the main body 54.
0 is screwed to regulate the rest position of the operation ring 80. The operation ring 80 is a coil spring 92.
Is urged toward the stopper ring 90.

A disc-shaped suction passage 94 is formed between the main body 54 and the nozzle forming member 56.
4 communicates with a shaft hole 98 of the main body 54 through an axial suction passage 96 formed in the main body 54 while being offset radially outward with respect to the axial exhaust passage 76. In order to reduce the suction resistance, it is preferable to form a plurality of axial suction passages 96. As can be seen from FIG. 4, when the syringe 14 is mounted on the handpiece 12, the shaft hole 98 of the handpiece body 54 communicates with the air chamber 32 of the syringe.

Next, in order to explain the mode of use and operation of the handpiece 12, as described above, after the piston 26 is separated from the plunger 24 of the commercially available disposable syringe and is inserted deep into the cylinder 22, Disposable syringe 1
4 is attached to the handpiece 12, and the compressed air hose 16 is connected to the handpiece 12. The device 10 including the assembly of the handpiece 12 and the syringe 14 can be held by only one hand as shown in FIG. In such a state of being gripped with one hand, the dentist can put the thumb on the operation ring 80 as shown in FIG. 1 and push the operation ring forward with only the thumb. In order to facilitate the operation with the thumb, the outer shape of the operation ring 80 is formed in a tapered shape, and the outer circumference of the operation ring 80 is provided with a series of grooves or knurls.

When the tip of the needle 28 of the syringe 14 is dipped in the liquid medicine in the liquid medicine container and the supply of compressed air is started by operating a foot pedal (not shown) of the dental unit, the compressed air is ejected by the ejector pump 52. Nozzle 6
The negative pressure is generated in the suction passage 94 of the ejector pump 52 by being injected from 6 toward the exhaust passage 76 in the axial direction.
This negative pressure is transmitted to the air chamber 32 of the syringe via the suction passage 96 and the shaft hole 98, and the floating piston 26 is retracted by the action of the negative pressure. Therefore, as shown in FIG. Sucked. By rotating the stopper ring 90 to adjust the rest position of the operation ring 80 and thus the opening degree of the radial exhaust passage 78, the suction speed of the chemical liquid can be adjusted. When the desired amount of drug solution is sucked into the syringe, the dentist can temporarily stop the supply of compressed air by operating the foot pedal.

After inserting the needle 28 of the syringe 14 into the cavity of the tooth, the root canal, or the periodontium, the operating ring 80 is moved forward with the thumb as shown in FIG. Restart air supply. Since the radial exhaust passage 78 of the ejector pump 52 is closed by the operating ring 80, the compressed air injected from the injection nozzle 66 flows backward through the suction passage as indicated by an arrow in FIG.
The pressure of the compressed air is applied to the air chamber 32 of the syringe 14. As a result, the floating piston 26 advances and ejects the chemical liquid in the cylinder from the needle 28.

After the cleaning and disinfection of the cavity and the root canal are completed in this way, the operating ring 80 is released by the action of the coil spring 92 by discarding the excess chemical liquid in the spitton or releasing it without discarding it. It returns to the position shown in FIG. As a result, the floating piston 26 retreats again by the action of the negative pressure generated by the ejector pump 52, sucks the used drug solution in the cavity or root canal into the syringe, and dries the cavity or root canal. After cleaning, disinfecting and drying the cavity or root canal, the dentist can remove the disposable syringe 14 from the handpiece 12 and discard. The new syringe 14 can be used for the next treatment of the patient.

Although a specific embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications and changes can be made. For example, the structure and outer shape of the operation ring and the syringe holder, and the arrangement of the air passage can be changed as appropriate.

[0029]

In the handpiece device 10 and handpiece 12 for dental cleaning and suction of the present invention, the commercially available disposable syringe 14 is used in a disposable manner, and the air system inside the handpiece is not contaminated. It is possible to prevent infection between patients without sterilizing the handpiece. Therefore, it is possible to provide a handpiece device and handpiece for dental cleaning and suction that are extremely easy to disinfect and maintain. Disposable syringes are very inexpensively available.

A series of operations for sucking, injecting, and re-sucking the drug solution can be performed by operating the operation ring 80 of the shutoff valve 86 with a finger while holding the handpiece with one hand, so that the dental treatment can be performed with only one hand. Can be done quickly and easily.

Cylinder 2 of commercially available disposable syringe 14
Since 2 is made of transparent plastic and the contents can be easily confirmed with the eyes, the dental treatment can be performed extremely easily and accurately.

According to the preferred embodiment, when the operating member of the shutoff valve 86 is constituted by the annular operating ring 80, the shutoff valve can be operated regardless of the rotational angle position of the handpiece, and the conventional swivel joint can be operated. Can be abolished. Therefore, the handpiece of the present invention has a simple structure, a small number of parts, and can be manufactured at low cost.

[Brief description of the drawings]

FIG. 1 is a side view showing a usage state of a handpiece device of the present invention.

FIG. 2 is an exploded view of the handpiece device shown in FIG.

FIG. 3 is an exploded perspective view of a commercially available disposable syringe.

4 is a cross-sectional view taken along line IV-IV of FIG.

5 is a perspective view showing how the commercially available disposable syringe shown in FIG. 3 is attached to a handpiece.

6 is a perspective view showing a state where the commercially available disposable syringe shown in FIG. 3 is attached to a handpiece.

FIG. 7 is an axial cross-sectional view of the handpiece shown in FIGS. 1 and 2, showing the operating ring in a rest position.

FIG. 8 is a cross-sectional view similar to FIG. 7, showing the operation ring displaced forward.

[Explanation of symbols]

 10: Handpiece device for dental cleaning and suction 12: Handpiece 14: Disposable syringe 22: Cylinder of disposable syringe 26: Floating piston of disposable syringe 28: Needle of disposable syringe 34: Flange of disposable syringe 40: Syringe of handpiece Holder 52: Ejector pump 66: Ejector pump injection nozzle 80: Operating ring

Claims (8)

[Claims] 1. A handpiece to which a compressed air supply hose can be connected at one end, and a disposable syringe detachably attached to the other end of the handpiece, wherein the disposable syringe is slidable in a cylinder and inside thereof. A floating piston fitted therein, the floating piston divides the interior of the cylinder into a liquid chamber and an air chamber, and the handpiece has a built-in ejector pump for generating negative pressure by jetting compressed air. The ejector pump includes an injection nozzle that communicates with a compressed air supply hose, an exhaust passage that communicates with the atmosphere, and a suction passage that communicates with an air chamber of a syringe, and the handpiece has the exhaust gas of the ejector pump. Equipped with a shut-off valve that opens and closes the passage, and when the exhaust passage is opened by operating the shut-off valve, the negative pressure generated in the suction passage acts on the cylinder. When the floating piston of the injector retreats to suck the liquid into the liquid chamber of the syringe and the exhaust passage is closed by operating the shutoff valve, the compressed air injected from the injection nozzle flows back into the air chamber through the suction passage. Then, the floating piston is advanced to eject the liquid in the liquid chamber. 2. The shutoff valve is provided with an annular operating member that extends in the circumferential direction along the outer circumference of the handpiece so that the shutoff valve can be operated regardless of the rotational angle position of the handpiece. A handpiece device according to claim 1. 3. The disposable syringe comprises a diametrically opposed flange with a notched peripheral edge, and the handpiece comprises a pair of diametrically opposed claws for gripping the flange. The handpiece device according to claim 1 or 2, wherein the syringe is attached to and detached from the handpiece by rotating the syringe. 4. A handpiece to which a compressed air supply hose can be connected at one end, and a syringe detachably attached to the other end of the handpiece, wherein the syringe is slidably fitted in a cylinder. And a floating piston that divides the inside of the cylinder into a liquid chamber and an air chamber, and the handpiece includes an ejector pump that generates negative pressure by injecting compressed air. The ejector pump includes an injection nozzle that communicates with a compressed air supply hose, an exhaust passage that communicates with the atmosphere, and a suction passage that communicates with an air chamber of a syringe, and the handpiece has the exhaust passage of the ejector pump. It is equipped with a shut-off valve that opens and closes the valve, and when the exhaust passage is opened by operating the shut-off valve, the negative pressure generated in the suction passage causes the floating piston The ton moves backward to suck the liquid into the liquid chamber of the syringe, and when the exhaust passage is closed, the compressed air injected from the injection nozzle flows backward into the air chamber through the suction passage to move the floating piston forward. A handpiece device for compressed air driven dental cleaning and suction, characterized in that the liquid in the liquid chamber is ejected. 5. The handpiece device according to claim 4, wherein the syringe comprises a disposable syringe with a plastic cylinder. 6. A mounting portion to which a disposable syringe can be removably mounted is formed at one end of the handpiece, and the other end of the handpiece is connectable to a compressed air supply hose, the disposable syringe being a cylinder and its inside. And a floating piston that is slidably fitted to the handpiece. The floating piston divides the inside of the cylinder into a liquid chamber and an air chamber, and generates negative pressure by injecting compressed air into the handpiece. An ejector pump is arranged, and the ejector pump includes an injection nozzle that communicates with a compressed air supply hose, an exhaust passage that communicates with the atmosphere, and a suction passage that communicates with an air chamber of a syringe. The pump is equipped with a shutoff valve that opens and closes the exhaust passage, and when the exhaust passage is opened by operating the shutoff valve, the negative pressure generated in the suction passage is affected. The floating piston of the syringe retracts further to suck the liquid into the liquid chamber of the syringe,
When the exhaust passage is closed by operating the shut-off valve, the compressed air injected from the injection nozzle flows backward into the air chamber through the suction passage to advance the floating piston to eject the liquid in the liquid chamber. A compressed air-driven dental cleaning suction handpiece characterized in that 7. The shutoff valve includes an annular operating member extending in the circumferential direction along the outer periphery of the handpiece, and the shutoff valve can be operated regardless of the rotational angle position of the handpiece. A handpiece according to claim 6, characterized in that 8. The handpiece according to claim 7, wherein the annular operating member is formed to have a thickened tip so that a user's finger can be easily engaged with the annular operating member.