JP4381563B2 - Dental handpiece - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a dental handpiece having a function of pouring and cooling a cutting working surface of a rotary cutting tool.
[0002]
[Prior art]
Conventionally, in dental treatment, the affected part is deleted using a handpiece with a rotating cutting tool inserted. However, in this treatment, heat is generated by cutting when the affected part is deleted. In order to prevent harmful effects on the living body and at the same time, in order to eliminate chips generated by cutting, water and air are mixed and sprayed onto the cutting surface of the rotary cutting tool.
[0003]
As the conventional handpiece, for example, a dental handpiece disclosed in Japanese Utility Model Publication No. 4-50015 or a dental handpiece disclosed in JP-A-2-228957 is known.
[0004]
As shown in FIG. 4, the dental handpiece disclosed in Japanese Utility Model Publication No. 4-50015 has a rotor 52 built in the head 51, and a rotary cutting tool 54 is mounted on the axis of the rotary shaft 53. A diverging cylindrical water injection hole 55 is provided in the vicinity of the cutting tool 54 mounting portion of the head 51 to simultaneously spray water and air toward the cutting action surface of the cutting tool 54.
[0005]
On the other hand, a water flow path 57 and an air flow path 58 are provided inside the handpiece body 56, and the water flow path 57 is connected to the circumferential groove 59 and the air flow path 58 is connected to the circumferential groove 60, as shown in the circle. The circumferential groove 60 and the circumferential groove 59 are communicated with each other through a small gap 61, and water and air are mixed in the circumferential groove 59 and sprayed in a mist form from the water injection hole 55. In addition, the injection direction with respect to the cutting action surface of the rotary cutting tool 54 can be injected over the entire length of the rotary cutting tool 54 by appropriately setting the inclination angle Θ1 and the opening angle Θ2 of the water injection hole 55.
[0006]
As shown in FIG. 5, the dental handpiece disclosed in JP-A-2-228957 has a water channel 73 connected to a circumferential groove 72 formed in the head 71, and an air channel to the circumferential groove 74. 75 is connected, and the circumferential groove 74 is in communication with a ring-shaped injection hole 78 formed at the outlet of the cylindrical water injection hole 77 via the circumferential groove 76, and simultaneously injects water and air in the form of a mist. It has become. In this case, air is injected as a conical airflow from the ring-shaped injection hole 78, whereby water is oriented to the cutting portion by the Coanda effect by the conical airflow to reduce turbulence.
[0007]
[Problems to be solved by the invention]
However, in the case of the dental handpiece disclosed in Japanese Utility Model Publication No. 4-50015, water and air are mixed in the circumferential groove 59 and then sprayed in the form of a mist from the diverging cylindrical water injection hole 55. As a result, there is a problem in that unevenness in the amount of water injection tends to occur depending on the mixed state of water and air in the circumferential groove 59.
[0008]
Further, in the case of a dental handpiece disclosed in Japanese Patent Laid-Open No. 2-228957, water is concentrated and oriented in the cutting part by the Coanda effect of conical airflow, and water is sprayed over a wide range by changing the spraying direction. For example, there is a problem that it is difficult to inject water on the average over the entire length of a rotary cutting tool having a long cutting action surface.
[0009]
Accordingly, the present invention has been made in view of the above-described problems, and an object thereof is to provide a dental handpiece capable of spraying water on the entire surface of the cutting surface of various shapes of rotary cutting tools on average.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, a dental handpiece according to claim 1 of the present invention is a handpiece for performing dental treatment while spraying water on a cutting action surface of a rotary cutting tool mounted on a head portion. A plurality of water injection holes are formed in the head portion into which the nozzle is inserted, the injection direction of the water injection holes is set at a constant angle with respect to the cutting action surface of the cutting tool, and the injection direction of the water injection holes with injection direction is formed adjacent the air injection hole which intersects obliquely to the water injection holes Te, diffusion range of the water injected by the Rukoto changing the jetting direction of the water at injection pressure from the air injection holes Is freely changed, and water is jetted onto a desired cutting action surface of the cutting tool.
[0011]
According to the dental handpiece of the first aspect, the jet direction of water is changed by the jet pressure of the air by jetting air in a direction obliquely intersecting the jet direction of the water jetted at a constant angle. Thus, the diffusion range of water injection can be freely changed, and water injection can be performed over a wide range of a rotary cutting tool having a long cutting action surface.
[0012]
The dental handpiece according to claim 2 forms an air injection hole adjacent to the water injection hole for injecting in directions intersecting at various angles with respect to the injection direction of the water injection hole set at a constant angle, The water injection hole and a pair of air injection holes formed adjacent to the water injection hole are formed at a plurality of locations around the rotary cutting tool.
[0013]
According to the dental handpiece according to claim 2, by providing a plurality of pairs of water injection holes and air injection holes formed in the direction where the injection directions intersect with each other and adjacent to each other at a plurality of locations around the rotary cutting tool, Water can be sprayed around the cutting action surface from a plurality of locations, and the effect of cooling the affected area and removing cutting waste can be enhanced.
[0014]
The dental handpiece according to claim 3 is a water injection direction relative to a longitudinal direction of the rotary cutting tool by changing a relative pressure between a water pressure injected from the water injection hole and a pneumatic pressure injected from the air injection hole. It is a feature that can be freely changed.
[0015]
According to the dental handpiece according to claim 3, by changing the relative pressure of the water to be jetted and the air to freely change the jetting direction of the water, it corresponds to the shape of the rotary cutting tool of various shapes. It becomes possible to inject efficiently to the cutting action surface.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 3 relate to an embodiment of the present invention, FIG. 1 is a sectional view of a head of a dental handpiece, FIG. 2 is a perspective view of the head of a dental handpiece, and FIG. 3 is an entire dental handpiece. FIG.
[0017]
As shown in FIG. 3, the dental handpiece of the present invention includes a head portion 2 containing a rotation mechanism (not shown) at one end of the handpiece body 1, and the rotary cutting tool 3 is attached to and detached from the rotation center of the built-in rotation mechanism. It is configured to be freely mounted.
[0018]
As this detailed structure, the head portion 2 includes a rotor 6 that rotates pneumatically around a rotating shaft 5 that is rotatably supported by upper and lower bearings 4 as shown in FIG. The rotary cutting tool 3 is detachably attached to the lower end of 5.
[0019]
A ring 7 is fixed to the lower surface of the head portion 2 via a nut 8, a water injection hole 9 is formed on the outer side of the lower surface of the ring 7, and an air injection hole 10 is formed on the inner side adjacent to the water injection hole 9. Is formed. On the other hand, a water flow path 11 and an air flow path 12 are provided on the handpiece body 1 side, and the water injection hole 9 is connected to the water flow path 11 via a circumferential groove 13 formed on the head portion 2 side. 10 is connected to the air flow path 12 through a circumferential groove 14.
In addition, the code | symbol 15 in a figure shows packing.
[0020]
The water injection holes 9 and the adjacent air injection holes 10 form a pair and are provided at a plurality of positions on a concentric circle centering on the tool 3. And the angle with respect to the rotating shaft of all the water injection holes 9 provided in a plurality of places is set to a constant angle of a = a ′, and each of the air injection holes 10 has a different angle such as b or c with respect to the rotating shaft. The water injection direction 16 and the air injection direction 17 intersect at intersections P, Q, and the like.
[0021]
Note that the water injection holes 9 and the air injection holes 10 that make a pair are desirably arranged to face each other at a plurality of locations on a concentric circle with the rotary cutting tool 3 as the center, but the arrangement is not limited to the face-to-face arrangement.
[0022]
In the dental handpiece having the above configuration, water and air pressurized by a pressure source (not shown) in use are supplied to the head unit 2 side through the water flow path 11 and the air flow path 12 of the handpiece body 1. The supplied pressure water is introduced into the circumferential groove 13 and ejected from the plurality of water ejection holes 9 communicating with the circumferential groove 13. On the other hand, the pressure air is introduced into the circumferential groove 14 and is ejected from the plurality of air ejection holes 10 communicating with the circumferential groove 14. In this case, the water injection 16 injected from the water injection hole 9 provided outside on the center of the rotary tool 3 and the air injection 17 injected from the air injection hole 10 provided adjacent to the inside are points P and Q. The direction of the water jet 16 is pushed outward by the pressure of the air jet 17 jetted from the inside, so that the water injection range is diffused to the range indicated by R or S.
[0023]
Further, by changing the relative jet pressure of water and air supplied to the dental handpiece of the present invention, the diffusion range indicated by R or S of the water jet can be freely changed, and various shapes can be obtained. Water can be efficiently ejected in accordance with the cutting action surface of the rotary cutting tool.
[0024]
【The invention's effect】
According to the present invention, with the respective injection directions injected from both the water injection hole and the air injection hole so as to intersect obliquely, by Rukoto at air injection pressure by changing the jetting direction of the water, the water It is possible to freely change the diffusion range of the injection and to perform water injection on the average over the entire length of the rotary cutting tool having a long cutting action surface.
[0025]
Moreover, since the water injection direction can be freely changed by relatively changing the air pressure or water pressure supplied to the handpiece, it is efficient for the cutting action surface of various shapes of rotary cutting tools with different lengths. Water injection can be performed.
[0026]
As described above, the heat and shavings generated in the affected area during treatment can be efficiently and reliably removed, the adverse effect of the generated heat on the living body can be prevented, and the treatment efficiency can be improved.
[Brief description of the drawings]
FIG. 1 is a sectional view of a head of a dental handpiece according to an embodiment of the present invention.
FIG. 2 is a perspective view of the head of a dental handpiece.
FIG. 3 is a side view showing the entire dental handpiece.
FIG. 4 is an explanatory diagram of a conventional handpiece.
FIG. 5 is an explanatory diagram of a conventional handpiece.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Handpiece main body 2 Head part 3 Rotary cutting tool 4 Bearing 5 Rotating shaft 6 Rotor 7 Ring 8 Nut 9 Water injection hole 10 Air injection hole 11 Water flow path 12 Air flow path 13, 14 Circumferential groove 15 Packing 16 Water injection direction 17 Air Injection direction

Claims (3)

In the handpiece for performing dental treatment while spraying water on the cutting action surface of the rotary cutting tool attached to the head part,
A plurality of water injection holes are formed in the head portion into which the rotary cutting tool is inserted, the injection direction of the water injection holes is set at a constant angle with respect to the cutting action surface of the cutting tool, and the water injection holes are injected. with injection direction is formed adjacent the air injection hole which intersects obliquely to the water injection hole with respect to the direction of water injected by the Rukoto changing the jetting direction of the water at injection pressure from the air injection holes The dental handpiece is characterized in that water is sprayed onto a desired cutting surface of the cutting tool by freely changing the diffusion range of the cutting tool.   An air injection hole is formed adjacent to the water injection hole and is adjacent to the water injection hole and is injected in a direction intersecting at various angles with respect to the injection direction of the water injection hole set at a constant angle. The dental handpiece according to claim 1, wherein a pair of air injection holes formed in this manner is formed at a plurality of locations around a rotary cutting tool. Claims, characterized in that to the injection direction of water relative to the longitudinal direction of the rotary cutting tool freely changed by changing the relative pressures between the air pressure ejected from the water pressure and the air injection hole for injecting from the water injection holes Item 3. A dental handpiece according to item 1 or 2 .

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