JP2017018460A - Dental instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dental instrument capable of swiftly removing a negative pressure state compared with a structure of flowing back exhaust.SOLUTION: The dental instrument includes a rotating body 30 provided inside a head part 11, equipped with a tooth treatment appliance, and rotating by air supply. The dental instrument further includes a lock mechanism configured to come into contact with/separate from the rotating body according to an amount of air supply. Preferably, the lock mechanism includes: a lock member 50 that is movable along the axial direction of the rotating body; and an elastic member 52 that, when the air supply is stopped, energizes the lock member in a direction of being engaged with the rotating body.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a dental instrument, and more particularly, to a dental instrument that is provided inside a head portion and includes a rotating body that is mounted with a tooth treatment tool and rotates by supplying air.

  As a treatment method for caries, removal of carious portions is generally performed, and teeth are cut with a dental instrument. Examples of dental instruments include those using an air turbine using compressed air and a micro engine using motor rotation. When an air turbine is used, it can rotate at a higher speed than a micro engine.

  On the other hand, when the air turbine is used, the rotating body coasts and rotates with its own inertial force even if the supply of air is stopped. For this reason, the air in the head portion is exhausted to be in a negative pressure state, and foreign matters are easily sucked into the head portion from the outside. In addition, if the blade is replaced while it is coasting, there is a risk of injury to the hand. Thus, for example, Patent Documents 1 and 2 disclose a technique for recirculating exhaust gas into the head portion to eliminate the negative pressure state.

Japanese Patent No. 5435655 JP 2014-12092 A

  However, in the techniques described in Patent Documents 1 and 2, a reflux path that communicates the air exhaust path and the inside of the head portion is provided, and the negative pressure state cannot be eliminated until the inside of the head portion is filled with the recirculated exhaust gas. There's a problem.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a dental instrument that can quickly eliminate a negative pressure state as compared with a structure in which exhaust gas is recirculated.

  In order to solve the above-mentioned problem, the invention of claim 1 is a dental instrument that is provided inside a head portion and is equipped with a rotating body that is mounted with a tooth treatment tool and rotates by supplying air. A lock mechanism configured to be engageable and disengageable with respect to the rotating body according to the supply amount of the air is provided.

  According to a second aspect of the present invention, in the first aspect of the invention, the locking mechanism includes a lock member that is movable along the axial direction of the rotating body, and the rotation of the lock member when the supply of air is stopped. And an elastic member that urges the body in a direction to be engaged with the body.

  According to a third aspect of the present invention, in the second aspect of the present invention, the lock member can be engaged with a blade of the rotating body to which the air is blown.

  According to the present invention, the locking mechanism of the rotating body is provided, and the rotating body stops by engaging with the rotating body. Therefore, the rotating body is quickly stopped as compared with the structure in which the exhaust gas is recirculated, The negative pressure state can be quickly eliminated.

It is an external view of the dental instrument which concerns on one Embodiment of this invention. It is sectional drawing of the head part shown in FIG. FIG. 3 is an exploded perspective view of the lid member shown in FIG. 2. It is a figure explaining operation | movement of a locking mechanism.

Hereinafter, the dental instrument of the present invention will be described with reference to the drawings. FIG. 1 is an external view of a dental instrument according to an embodiment of the present invention. 2 is a sectional view of the head portion shown in FIG. 1, and FIG. 3 is an exploded perspective view of the lid member shown in FIG.
A handpiece 10 shown in FIG. 1 includes a head portion 11 and a grip portion 12, and an instrument cord 13 that can supply air or water toward the head portion 11 is installed at the rear end of the grip portion 12. ing.

The grip portion 12 is formed, for example, curved, and a head portion 11 to which a tooth treatment tool (for example, a cutting bar) 14 can be attached is provided at the front end.
For example, when a foot controller (not shown) is stepped on, air or the like is supplied into the head unit 11, and when the foot controller is stopped, supply of air or the like is stopped.

  As shown in FIG. 2, the head portion 11 has a connecting cylinder 20 that is connected to the grip portion. An air supply path 23, a turbine chamber 22, an exhaust path 21 and a light guide 24 are formed in the connecting cylinder 20. The air supply path 23 and the exhaust path 21 open to the turbine chamber 22, and the light guide 24 is disposed below the exhaust path 21 and opens toward the vicinity of the tip of the tooth treatment tool. In FIG. 2, the description of the tooth treatment device is omitted.

  The turbine chamber 22 is provided with a rotating body 30. The axis of the rotator 30 intersects the front end of the grip portion, for example, in the orthogonal direction, and the rotator 30 is rotatably supported by the connecting cylinder 20 via a ball bearing 33. A seal member 35 is provided between the ball bearing 33 and the connecting cylinder 20.

  The rotating body 30 has a plurality of blades 31 made of, for example, brass or aluminum. The blades 31 extend outward in the radial direction of the rotating body 30 and are formed so as to be able to receive air. The rotating body 30 can rotate when compressed air from the air supply path 23 is supplied to the turbine chamber 22 and blown against the blades 31.

The rotating body 30 has a sleeve 32 to which a tooth treatment tool can be attached. The root of the tooth treatment device is inserted into the sleeve 32 through the sleeve opening 32a.
In the sleeve 32, for example, a press chuck type chuck 37 is provided on the opposite side of the sleeve opening 32a. The tooth treatment device attached to the sleeve 32 can be extracted from the sleeve 32 by pushing the chuck upper surface 37a toward the sleeve opening 32a.

  The head unit 11 has a lid member 40 that covers the turbine chamber 22. A central opening 41 that can receive the upper side of the rotating body 30 is formed in the lid member 40, and the rotating body 30 is rotatably supported by the lid member 40 via a ball bearing 43. A seal member 45 is provided between the ball bearing 43 and the lid member 40, and a seal member 46 is provided between the lid member 40 and the connecting cylinder 20.

Here, for example, the lid member 40 is provided with a lock mechanism. Specifically, the lid member 40 has, for example, a cup-shaped accommodation chamber 47 that can accommodate the lock mechanism between the central opening 41 and the outer peripheral surface of the lid member 40. The axis of the storage chamber 47 is parallel to the axis of the rotating body 30, for example.
As shown in FIG. 3, the lock mechanism includes, for example, a lock member 50, a screw 51, and a spring 52.

  The lock member 50 includes a disk-like base portion 50a that can move in the storage chamber 47 and a rod-like protrusion portion 50b that extends downward from the base portion 50a, and extends in the axial direction of the rotating body 30 described in FIG. It is configured to be able to engage and disengage with respect to the rotating body 30 by moving along. The lock member 50 is made of stainless steel, for example. The screw 51 is installed in the vicinity of the opening of the accommodation chamber 47 and can restrict the movement of the lock member 50 toward the rotating body 30. The spring 52 is installed at the bottom of the storage chamber 47 and urges the lock member 50 in a direction to engage the rotating body 30. The spring 52 corresponds to the elastic member of the present invention.

FIG. 4 is a diagram for explaining the operation of the locking mechanism.
When the compressed air is supplied into the head portion 11 described with reference to FIG. 2 due to the foot controller being depressed, the pressure in the turbine chamber 22 increases. As a result, the pressure in the turbine chamber 22 overcomes the urging force of the spring 52, and the lock member 50 is detached from the blade 31 of the rotating body 30 as shown in FIG. Retracts into the storage chamber 47.

  On the other hand, when the stepping of the foot controller is stopped, the supply of compressed air into the head unit is stopped. In this case, conventionally, the rotating body is coastingly rotated by its own inertia force for about 1.5 to 3 seconds, for example. For this reason, the air in the turbine chamber is discharged and a negative pressure state is reduced to several atmospheres, and foreign matter is easily sucked into the head portion from the outside. In addition, the tooth treatment device is also rotating while it is rotating.

  However, according to the present invention, when the supply of compressed air into the head portion 11 described with reference to FIG. 2 is stopped, the urging force of the spring 52 overcomes the pressure of the turbine chamber 22, and as shown in FIG. The lock member 50 moves to a position where the base 50 a is regulated by the screw 51. As a result, the tip of the protrusion 50b is inserted between, for example, the blade 31 and the blade 31 and engages with the vicinity of the tip of the rotating blade 31, so the rotating body 30 is forcibly stopped.

  Thus, if the lock mechanism of the rotating body is provided, the negative pressure state can be quickly eliminated by stopping the rotating body more quickly than the structure in which the exhaust gas is recirculated. Then, if the coasting rotation is eliminated, it is possible to prevent, for example, inhalation of foreign matter due to a negative pressure state and unintentional damage to the oral cavity due to a tooth treatment device. It also contributes to shortening the treatment time because there is no feast time. In addition, a simpler structure can be achieved by the above-described lock mechanism including the lock member, the spring, and the screw.

In the above-described embodiment, the example in which the lock member is engaged near the tip of the blade has been described. However, the lock member may be engageable with the root portion of the blade. In this case, the durability of the rotating body can be improved.
Moreover, in the said Example, the lock member was demonstrated and demonstrated as an example inserted between blades. However, it is possible to achieve the quick stop function of the rotating body by engaging, for example, a groove formed on the upper surface of the rotating body.

DESCRIPTION OF SYMBOLS 10 ... Handpiece, 11 ... Head part, 12 ... Grip part, 13 ... Instrument cord, 14 ... Tooth treatment tool, 20 ... Connection pipe | tube, 21 ... Exhaust path, 22 ... Turbine chamber, 23 ... Air supply path, 24 DESCRIPTION OF SYMBOLS ... Light guide, 30 ... Rotating body, 31 ... Blade, 32 ... Sleeve, 32a ... Sleeve opening, 33 ... Ball bearing, 35 ... Seal member, 37 ... Chuck, 37a ... Chuck upper surface, 40 ... Cover member, 41 ... Center opening , 43... Ball bearing, 45 and 46... Sealing member, 47... Storage chamber, 50... Locking member, 50 a.

Claims (3)

A dental instrument that is provided inside the head portion and includes a rotating body that is mounted with a tooth treatment tool and rotates by supplying air,
A dental instrument comprising: a lock mechanism configured to be engageable and disengageable with respect to the rotating body according to the supply amount of the air.   The lock mechanism includes a lock member that is movable along an axial direction of the rotating body, and an elastic member that biases the lock member in a direction to engage the rotating body when the supply of air is stopped. The dental instrument according to claim 1, comprising: a dental instrument. The dental instrument according to claim 2, wherein the lock member is engageable with a blade of the rotating body to which the air is blown.

Images