JP4752079B2 - Dental vacuum handpiece - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of a compressed air-driven dental vacuum handpiece for cleaning a tooth root canal and sucking and removing a cleaning liquid in a dental procedure.
[0002]
[Prior art]
In root canal treatment, the inside of the root canal is washed by injecting the washing solution into the root canal, and the used washing solution is removed from the root canal by vacuum suction.
Japanese Patent Application No. 2000-190678 discloses a compressed air-driven dental vacuum handpiece used for root canal cleaning and cleaning liquid suction.
In this vacuum handpiece, a compressed air-driven ejector pump equipped with a compressed air injection nozzle, a diffuser port, and a negative pressure port is incorporated in the head of the handpiece body, and a negative pressure is generated according to the injection of compressed air. Negative pressure is generated at the port. The negative pressure port of the ejector pump is connected to a suction pipe holder that is fixed to the head of the main body by press fitting, etc., and a disposable suction pipe made of vinyl resin or the like is replaceably attached to this suction pipe holder. The
[0003]
In use, this vacuum handpiece can be connected interchangeably with an existing dental hose extending from the dental unit, such as a turbine handpiece for tooth grinding, and supplied with compressed air from the dental unit . When the ejector pump is operated by supplying compressed air, the cleaning water in the root canal is sucked from the suction pipe and removed from the root canal by the negative pressure generated by the ejector pump.
[0004]
[Problems to be solved by the invention]
In this vacuum handpiece, it is not easy to clean when the suction tube holder is clogged with tooth tissue pieces or crushed pieces.
The suction tube holder is protruded from the head of the handpiece body so that a disposable suction tube can be inserted and removed. Therefore, when the handpiece is inadvertently dropped on the floor, the suction tube holder may be deformed or damaged due to the impact of the handpiece's own weight, and the suction tube may not be properly attached. As a result, there is an inconvenience that the vacuum handpiece cannot be used unless the handpiece is bothered for repair and the suction tube holder is replaced.
[0005]
An object of the present invention is to provide a dental vacuum handpiece that can easily cope with clogging of a suction tube holder.
Another object of the present invention is to provide a dental device in which a user (dentist) can easily replace a suction tube holder when the suction tube holder is deformed and damaged by accidentally dropping a vacuum handpiece. It is to provide a vacuum handpiece.
[0006]
[Means for Solving the Problems]
The present invention incorporates an ejector pump driven by compressed air into the head of the handpiece body, a suction pipe holder connected to the negative pressure port of the ejector pump is provided at the main body head, and a liquid is discharged from the suction pipe attached to the suction pipe holder. In the dental vacuum handpiece adapted to suck the water, the suction tube holder is detachably attached to the head of the handpiece main body and locked to the head by a set screw.
[0007]
With this configuration, when the suction tube holder is clogged or deformed or damaged due to unintentional dropping, etc., the user can simply replace the suction tube holder by loosening the set screw. And the dental procedure can be continued without much interruption.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Referring to the accompanying drawings, the vacuum handpiece 10 includes an elongated handpiece body 12 that can be gripped by hand. In the illustrated embodiment, the handpiece body 12 includes an anterior half 16 and a posterior body 17 that are detachably connected by a ball lock quick joint 14 well known in the field of dental handpieces. It can be separated from the body 17 and sterilized by heating in an autoclave.
[0009]
In order to connect this vacuum handpiece 10 to a dental hose 18 extending from a dental unit (not shown), a plug portion 20 of a conventional ball lock type quick joint is provided at the rear end of the handpiece rear body 17. The socket part 19 formed and attached to the tip of the dental hose 18 is detachably fitted by a one-touch operation.
The dental hose 18 is of a conventional type, and although not shown, a compressed air passage and a water passage are formed therein as is well known.
[0010]
A socket hole 24 of a hose joint is also formed in the rear part of the handpiece rear body 17 so that a male member 22 of a conventional hose joint provided at the tip of the dental hose 18 is fitted. Yes.
When the handpiece body 12 and the dental hose 18 are connected by the hose joint 22/24, the compressed air passage in the dental hose 18 is connected to the compressed air passage 26 formed in the handpiece body 12, and the dental hose 18 is connected. A water passage in the hose 18 is connected to a water passage 28 formed in the handpiece body 12.
In the illustrated embodiment, the compressed air passage 26 in the handpiece body 12 is provided with a flow control valve mechanism 30 described in Japanese Patent Publication No. 7-16497, and the compressed air passage 26 is turned by turning the operation ring 31. The flow rate of the flowing compressed air is adjusted.
[0011]
A compressed air driven ejector pump 34 is incorporated in the head 32 of the handpiece body 12.
In the illustrated embodiment, the ejector pump 34 is pivotally mounted on the main body head 32. Therefore, as can be clearly seen from FIG. 3, a cylindrical recess 36 is formed in the main body head 32, and a substantially cylindrical main body 38 of the ejector pump 34 is rotatably mounted in the recess 36. is there.
Sealing between the recess 36 and the ejector pump body 38 is performed by a pair of O-rings 37 shown in the figure.
The ejector pump main body 38 is prevented from coming off by a retaining pin 40 that engages with an annular groove formed on the outer periphery of the main body 38.
[0012]
The ejector pump main body 38 has a compressed air injection passage 42 having a small diameter and acting as an injection nozzle, and an exhaust passage formed on an extension line of the outlet of the injection passage 42 and opening as a diffuser port having a larger diameter. 44 and a suction passage (negative pressure port) 46 orthogonal to the exhaust passage 44 are formed, and the suction passage is formed by injecting compressed air from the injection passage (injection nozzle) 42 toward the exhaust passage (diffuser port) 44. A negative pressure is generated in the (negative pressure port) 46.
The compressed air supplied to the injection passage 42 of the ejector pump 34 is supplied from the compressed air passage 26, the central cavity 52, the compressed air passage 54, and the compressed air formed in the handpiece front half 16. This is done via the passage 56.
[0013]
The main body head 32 is provided with a stepped hole 48 coaxially with the suction passage (negative pressure port) 46, and the suction pipe holder 50 is fitted in the hole 48. An annular groove is provided in the upper portion of the suction tube holder 50, and the suction tube holder 50 is locked to the head portion 32 by engaging a set screw 58 screwed into the main body head portion 32 with the annular groove.
A disposable tapered suction tube 60 made of a relatively flexible transparent resin material such as vinyl resin is detachably attached to the suction tube holder 50. The negative pressure generated in the ejector pump 34 is transmitted to the suction pipe 60 via the suction pipe holder 50.
[0014]
The water passage 28 formed in the handpiece latter half body 17 is a water passage formed in the handpiece front half body 16 via a filter 62 stored in the latter half body 17 and a water passage 64 formed in the latter half body 17. 66.
A slight radial clearance or axial groove 68 is formed between the stepped hole 48 of the main body head 32 and the suction tube holder 50, from the dental unit to the dental hose 18, water passage 28, and water. The washing water supplied through the passage 66 is supplied to the upper part of the suction pipe 60 through these radial clearances or axial grooves, and drops along the outer periphery of the suction pipe 60.
[0015]
In the illustrated embodiment, a backwashing mechanism is provided to backwash the suction tube 60 when the suction tube 60 is clogged with tooth fragments or tissue pieces. Therefore, the central cavity 52 of the handpiece latter half body 17 is connected to the central passage 74 of the suction pipe holder 50 via the compressed air passage 70 formed in the latter half body 17 and the compressed air passage 72 formed in the front half body 16. It is connected.
A spool valve type backwash control valve 76 is incorporated in the compressed air passage 70. The backwash control valve 76 is configured such that when the operation button 78 is pressed, compressed air is sent to the compressed air passage 72, and when the operation button 78 is opened, the supply of compressed air is stopped.
[0016]
In use, the vacuum handpiece 10 is connected to a dental hose 18 from a dental unit. The supply of compressed air and cleaning water is controlled by a foot switch (not shown) attached to the dental unit.
In performing the root canal treatment, a suction port of an intraoral vacuum (not shown) is positioned in advance to the side of the tooth to be treated in the patient's oral cavity, and vacuum suction is started.
When the supply of cleaning water to the vacuum handpiece 10 is started by operating the foot switch of the dental unit, the cleaning water is supplied to the upper portion of the suction pipe 60 via the water passages 28, 64, 66 and the axial groove 68. Supplied and dropped from there along the outer circumference of the suction tube. Therefore, the root canal can be washed by inserting the tip of the suction tube 60 into the root canal of the tooth.
[0017]
When the supply of compressed air is started by operating the foot switch, the compressed air is sent to the injection passage 42 of the ejector pump 34 through the compressed air passage 26, the central cavity 52, the compressed air passages 54 and 56, and exhausted from the injection passage 42. It is injected toward the passage 44. As a result, a negative pressure is generated in the suction passage 46, and used washing water in the root canal is sucked from the suction pipe 60.
The sucked cleaning water is discharged forward together with the used compressed air from the exhaust passage 44, sucked by the intraoral vacuum disposed therein, and sent to the dental unit. The direction of the exhaust passage 44 can be adjusted by turning the ejector pump body 38.
[0018]
During use of the vacuum handpiece 10, the suction passage 60 or the central passage 74 of the suction tube holder 50 may be clogged by sucking a tooth cutting piece or the like. In that case, when the push button 78 is depressed to open the backwash control valve 76, the compressed air in the central cavity 52 is injected into the central passage 74 of the suction pipe holder 50 through the compressed air passages 70 and 72. A part of the compressed air injected into the passage 74 is directed to the exhaust passage 44, but the remaining portion of the compressed air is ejected from the suction pipe 60 to blow off the clogging. Thereby, the suction pipe 60 and the central passage 74 are cleaned.
[0019]
When a strong clogging occurs in the central passage 74 of the suction tube holder 50, the set screw 58 of the main body head 32 is loosened, the suction tube holder 50 is removed, and a new suction tube holder 50 is attached and a set screw is attached. Stop at 58.
Similarly, when the suction tube holder 50 is deformed or damaged by dropping the handpiece on the floor unintentionally, the suction tube holder 50 can be easily replaced by loosening the set screw 58.
[0020]
Although specific embodiments of the present invention have been described above, the present invention is not limited to them, and various modifications and changes can be made. For example, although the ejector pump is configured to be pivotable in the illustrated embodiment, the ejector pump can be formed so as not to pivot by machining the three passages directly into the main body head. Further, the backwashing mechanism is not essential and can be omitted. Furthermore, the ball lock type quick joint 14 can also be omitted.
[Brief description of the drawings]
FIG. 1 is a side view of a dental vacuum handpiece of the present invention.
FIG. 2 is a cross-sectional view of the handpiece shown in FIG.
FIG. 3 is an enlarged cross-sectional view of the head of the handpiece shown in FIG.
[Explanation of symbols]
10: Dental vacuum handpiece 12: Handpiece body 32: Headpiece body head 34: Ejector pump 46: Suction passage (negative pressure port)
50: Suction tube holder 58: Set screw 60: Suction tube

Claims (1)

A compressed air-driven ejector pump is incorporated into the head of the handpiece body that is inserted into the patient's oral cavity when the handpiece is used, and a suction pipe holder connected to the negative pressure port of the ejector pump is attached to the head of the handpiece body . In the dental vacuum handpiece that is provided on the suction tube holder and sucks the liquid from the suction tube attached to the suction tube holder, the suction tube holder is detachably mounted on the head of the handpiece body, and the head is fixed by a set screw. Dental vacuum handpiece, characterized in that it is locked to the part.

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