JPH0531124A - Dental treating apparatus with induction contact - Google Patents

Abstract

PURPOSE:To obtain a better image by a method wherein an induction coil connected to an electric element is arranged on a front connection surface while another induction coils is connected to a lead on a rear connection surface, and the coils are connected coaxially and an electrical signal is transmitted from the electric element to prevent oxidative corrosion of a conductor part without the exposure thereof. CONSTITUTION:At mated parts where a front part 1 joins on a rear part 2, a primary side induction coil 2 is mounted securely on the rear part 2 while a secondary side induction coil 31 on the front part 1 and center axes of both the coils align the center axis of an inserting tube 22. Outer circumferential ends of ferromagnetic circular bodies of both the inductor coils and inner circumferential ends thereof abut each other respectively on a connection surface between the secondary induction coil 31 on the front part 1 and the primary induction coil 32 on the rear part 2 to form a transformer. Thus, for example, when an alternating current with a commercial electrode frequency is supplied to the primary induction coil 32, an AC voltage is generated in the secondary induction coil 31 and when the secondary induction coil 31 is connected to a lighting lamp 4, it emits light.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dental treatment instrument such as a handpiece in which a front part and a rear part are rotatably and detachably connected to each other. To improve the electrical contacts for supplying or transmitting electrical signals from the electrical element to the rear.

[0002]

2. Description of the Related Art In a dental motor-driven cutting handpiece or the like, it is usual to be able to separate a gripping part containing a drive motor and an operating part continuing to a cutting blade, and power is supplied to the handpiece. The electric wires for supply and the tubes for air supply and water supply are collectively inserted into the soft hose,
It is detachably connected to the rear end of the handpiece via the connector portion. In this way, if the dental treatment device can be divided into two or more parts, each part of the treatment device is given compatibility, and it is convenient to replace each part in case of failure or according to the purpose of the treatment. Further, since only the necessary part can be removed and sterilized and washed, it is possible to avoid damage to the motor part and the like which are not suitable for high temperature and high pressure sterilization.

[0003] A dental treatment instrument usually has a bent shape at its working end so that it can be conveniently inserted into the oral cavity and treated at the target site of the target tooth. The hose connected to the rear of the handpiece is a hindrance when turning to obtain a suitable handpiece angle. Therefore, it is possible to release the restraint from the hose by rotatably providing a connecting portion on the connector or the gripping portion that connects the electric wire / tube to the handpiece body. If an electric element such as a lamp for lighting is built in the part, when connecting the power line of the lamp to the rear connector, it is necessary to provide a detachable and rotatable contact at the connecting part. There is.

In the conventional handpiece, for example,
A slip ring of a conductor is exposed and disposed on one of the connection surfaces of the grip portion and the joint portion connected thereto, and the other connection surface is brought into contact with a position corresponding to the slip ring. In the state where the child is disposed and both members are connected, the contact is slid on the slip ring to be in an energized state, and power for illumination is supplied from the grip portion to the joint portion, and both members are connected. It is known that the space between them can rotate (Japanese Patent Publication No. 61-45461).

[0005]

As described above, by utilizing the contact point composed of the slip ring and the contactor at the detachable connecting portion, the gripping portion and the joint portion are rotatably attached to each other. An electric wire or the like can be inserted from the holding portion to the joint portion through the contact. However, a rotatable contact utilizing this slip ring has a long life and a short life due to frictional deterioration of the metal surface of the slip ring, resulting in poor electrical connection. Since it is easy to corrode, the slip ring will corrode when sterilized under high temperature and pressure by an autoclave.
The electrical connection is poor and it cannot be used. In particular, when a signal from a CCD camera built in near the tip of the handpiece is transmitted through the slip ring, noise is generated in the transmitted signal, which disturbs the image on the monitor.

The present invention has been made to solve the above problems, and has an electrically movable contact, which has a highly reliable electric contact without the conductive portion being exposed to the outside atmosphere. It is intended to provide a dental treatment instrument.

[0007]

The dental treatment instrument of the present invention has one or more electric elements selected from among a lighting bulb, a drive motor, an ultrasonic transducer and an image pickup element, A dental treatment instrument in which a rear part and a front part in which the electric element is incorporated are connected so as to be rotatable about a rotation axis and detachable, and the electric element is provided on a connection surface of the front part. And an induction coil electrically connected to the rear part, and an induction coil connected to a lead wire from the rear side is connected to the connection surface of the rear part, and when the front part and the rear part are connected to each other. The induction coil is arranged coaxially with the rotation axis and coaxially close to supply electric power to the electric element via the both induction coils, and / or from the electric element. It is characterized by transmitting electric signals. Further, the dental treatment instrument of the present invention,
In particular, it is characterized by comprising gap adjusting means for adjusting the gap at the connection surface between the ferromagnetic body enclosing the front induction coil and the ferromagnetic body enclosing the rear induction coil. Is.

[0008]

The front portion and the rear portion face each other at the connecting surfaces which face each other when they are connected, or serve as a sliding contact surface, and an induction coil is arranged on each of the connecting surfaces of the front portion and the rear portion. , When the front part and the rear part are connected, both induction coils are coaxially arranged close to each other, so if an alternating current is applied to one coil, an alternating current is applied to the other induction coil by electromagnetic induction. If an external AC power supply is connected to the rear induction coil and the front induction coil is connected to the lamp for lighting, when the two induction coils approach each other, the lighting lamp emits light with the external power source. In general, if an electric element is connected to the front induction coil, the electric element can be operated. Both induction coils are not mechanically coupled to each other, and even if the front part is rotated with respect to the rear part around the rotation axis, the electromagnetic induction effect of the induction coil does not change, It becomes possible to constantly supply electric power from the rear side to the front side.

Since the induction coil has no contact portion due to contact, the metal surface is not exposed to the outside atmosphere, and it is extremely easy to cover and fill it with a corrosion-resistant insulator such as a synthetic resin, so that it can be used for a long period of time. Even in the case, it is not lost by friction and is not oxidized or corroded.

Further, an electric signal from an image pickup device such as a CCD camera can be easily transmitted to the external image control unit via the induction coil in the front portion, and since there is no contact portion due to contact, the connection is made. No electrical noise is picked up even if it is rotated in the section.

In particular, if the gap at the contact surface of the ferromagnetic material enclosing the pair of induction coils is adjusted, the gap becomes zero to maximize the power transfer rate, and the power transfer rate is provided by providing a corresponding gap. It becomes possible to supply the desired electric power by setting zero to zero and adjusting to a proper gap.
By adjusting the gap adjusting means, it is possible not only to open / close the power supply of the illumination lamp but also to adjust the illuminance of the illumination lamp provided in the front part to arbitrarily obtain the brightness of the tooth treatment site.

[0012]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1A is a cross-sectional view of a motor-driven tooth cutting hand piece according to an embodiment of the present invention. The front portion 1 of the hand piece is a joint connected to a head portion 12. A small bulb 4 for illumination is provided in the joint pipe portion 11 of the pipe portion 11, and a light beam from the light bulb 4 approaches a cutting tool mounting hole of the head portion 42.
The light guide 41 that has been inserted up to this point is electrically connected to illuminate the vicinity of the tip of the tool. The rear part 2 of the handpiece is a gripping part 21 equipped with a drive motor inside, and the front side of the gripping part 21 is an insertion tube 22 having a drive shaft incorporated therein. , The joint pipe section 1
The drive shaft is inserted into the accommodation space 13 provided at the end portion of the connector 1 so as to be easily attached and detached, and the drive shaft is connected to the drive shaft on the joint pipe side to transmit the power from the motor. The front part 1 and the rear part 2 are the inner surface of the accommodation space 13 and the rear part 2 of the front part 1.
By the sliding contact with the outer surface of the insertion tube 22, the object is rotatably joined and detachable.

In this embodiment, the front portion 1 and the rear portion 2 are
The primary side induction coil 32 is attached and fixed to the rear portion 2 at a portion where the and face to face each other when they are joined.
A secondary side induction coil 31 is attached and fixed to the coil, and the central axes of both coils are arranged to be the same as the central axis of the insertion tube 22.

The cross-sectional shape of the induction coil is shown in FIG.
As shown in, the annular body 33 made of a soft magnetic material,
34, the cross-sectional shape is a rectangle having a void, the void is open to one side surface of the annular body, and the coil is formed by winding a conductor wire in the void of the annular body. 31,
The interior is 32. The magnetic material may be formed by laminating a soft iron plate or a silicon steel plate, but a sintered ferrite magnetic material is preferably used. Also,
The end surface 35 of the opening of the annular body is sealed with an insulating material of synthetic resin to maintain the water tightness of the induction coil. The secondary induction coil 31 of the front part 1 and the primary induction coil 32 of the rear part 2 are connected to each other at the outer peripheral end and the inner peripheral end of the ferromagnetic annular body of both induction coils. When they come into contact with each other to form one transformer, and therefore, the primary induction coil 32 is supplied with, for example, an alternating current having a commercial power supply frequency, an alternating voltage is generated in the secondary induction coil 31, and the secondary induction coil 31 is formed. When the light bulb 4 for illumination is connected, the light bulb 4 is made to emit light.

2 (A) and 2 (B) show how the induction coil is arranged when the front part and the rear part of the handpiece are separated, but the primary induction coil 32 is the rear part 2. The secondary induction coil 31 is fixed to the connection surface of the motor unit 21.
Is fixed to the connection surface of the joint portion 22 which is the front portion 1.

FIG. 3A shows an embodiment of a compressed air turbine type handpiece for tooth cutting. In this example, the connector part 23 that connects the air supply pipe for driving the turbine, the electric wire for the illumination lamp, and the water supply pipe for cooling together to the joint part 11 of the handpiece becomes the rear part 2, and the joint part 1 of the handpiece.
1 is the front part 1, and the connector part 23 is detachably connected to the joint part 11 of the handpiece. An insertion pipe 24 is projectingly provided on the connector portion 23, and is inserted into the storage space 13 provided on the rear side of the joint portion 11 of the handpiece, and the water supply pipe and the air supply pipe correspond to the water supply pipe of the main body. The primary induction coil 32 is concentrically attached to the tip of the insertion tube 24 to connect the external power source and the electric wire 3.
6 and the secondary induction coil 31
Is disposed at the deepest portion of the storage space 13 of the body of the handpiece so as to be concentric with the insertion tube 24 and concentrically with the outer circumference of the primary induction coil 32. . Since the secondary induction coil 31 is connected to the lighting bulb 4 fixed in the main body of the handpiece, if the connector portion is connected, the secondary induction coil 32 can be supplied with an alternating current to cause the secondary induction coil 32 to flow. An alternating current is generated in the induction coil 31, the light bulb 4 is caused to emit light, the light guide 41 is transmitted, and the vicinity of the tip of the cutting blade is illuminated.

The structure of the induction coil used in this example is as follows.
As shown in FIG. 3B, both ends of the ring-shaped body are bent in the outer peripheral direction, and a conductive wire is wound around the inner space of the ring-shaped soft magnetic body 34 which is open to the outer peripheral side. , The primary induction coil 32, and the secondary induction coil 31 is formed by winding a conductive wire around the inner space of a soft magnetic body having an inner space similarly opened on the inner peripheral side. , The magnetic bodies 33 and 34 of both induction coils 31 and 32 are rotatable with a slight narrow gap between the outer peripheral side end surface of the primary induction coil 32 and the inner peripheral side end surface of the secondary induction coil 31. Is fitted to form a transformer.

FIG. 4 shows an embodiment of a dental vibration cutting instrument, in which electric power supplied to the illuminating light bulb 4 for illuminating a treatment area is generated at the joint surface between the instrument body 15 and the connector portion 23. A pair of induction coils 31, 32 provided on both sides
An inductive contact is formed on the joint surface in a non-contact state so that the joint surface is rotatable and detachable. The structure of the induction coil is the same as that shown in FIG. In this example, a spacer 8 made of a synthetic resin and having an appropriate thickness is interposed in the gap between the end faces of the ferromagnetic bodies 33 and 34 of both induction coils, and the coupling degree of the transformer is adjusted to adjust the brightness of the illumination. It's suppressed.

Further, in FIG. 4, the high frequency voltage supplied to the ultrasonic transducer 5 is also supplied from the outside by a pair of induction coils 315, 325 arranged on the joint surface between the main body 15 and the connector portion 23. It is induced from the high frequency current flowing through the electric wire 37 from the high frequency power supply.

FIG. 5 shows an example of application to a three-way syringe. A CC provided on the rear side of the nozzle with an image fiber 61 from the tip of the nozzle of the syringe.
The D image sensor 6 is optically coupled to convert the image of the affected area into an electric signal, and the electric signal is fixed to the deepest part of the insertion tube accommodating space of the syringe body and the primary induction coil 31 and the connector portion 23. Is transmitted to the external monitor control unit via electromagnetic coupling with the secondary induction coil 32 fixed to the tip of the insertion tube. The induction coils 31, 32 for image signal transmission must be high frequency coils, and
The induction coils 31 and 32 need to be a wide band transformer by using a ferrite material having excellent high frequency characteristics as a magnetic material.

A syringe equipped with a CCD image pickup device needs to be provided with an illumination lamp for illuminating an image pickup site. For this purpose, an illumination electric wire is similarly provided in FIG. 1 or 3. A contactless type can be obtained by the induction coil having the configuration shown.

FIG. 2 shows a gap adjusting means for adjusting the gap at the connection surface between the ferromagnetic material enclosing the front induction coil and the ferromagnetic material enclosing the rear induction coil of the treatment instrument. However, in the accommodation space 13 provided at the end of the joint pipe portion 11, the locking projection 9 is provided on the inner surface, and the outer peripheral surface of the insertion pipe 22 inserted into this accommodation space is A spiral groove 91 into which the locking projection 9 is fitted is engraved. The rear grip portion 21 is provided in the space 13 of the joint pipe portion 11 of the front portion 1.
By inserting and connecting the insertion tube 22 of No. 1 and rotating the rear part 2 slightly with respect to the front part 1, the gap between the ferromagnetic bodies 33 and 35 of the two induction coils facing each other at the connection surface is adjusted. Therefore, the coupling coefficient of the transformer is changed to adjust the brightness of the illumination.

[0024]

The following effects can be obtained by implementing the dental treatment instrument having the inductive contact of the present invention.

1) On the joint surface between the front part and the rear part of the treatment instrument,
By arranging the induction coil, it is possible to transmit electric power and electric signals between the front part and the rear part that are rotatable and detachably connected by electromagnetic coupling without having mechanical contact parts. Therefore, the front part of the treatment instrument can be freely rotated with respect to the connector part and the motor part according to the necessity of treatment, and the treatment instrument which is easy for the practitioner to use can be provided.

2) The contact made of the induction coil is not exposed to the surface of the therapeutic instrument by the metal, so that it will not be oxidized and corroded even after many years of use, and cannot be used even by sterilization under high temperature and high pressure. Without it, the durability is improved, and thus the treatment instrument with the inductive contact is highly reliable.

3) When the induction coil is used as a broadband high frequency coil, an electric signal from a CCD image pickup device installed in the front part of the treatment instrument can be transmitted to the monitor controller via the coil. Since it is not a mechanical contact point, even if the front part is rotated, electrical noise is not generated and good image reproduction is possible.

4) An illumination bulb or the like connected to the secondary induction coil by adjusting the gap at the connection surface of the ferromagnetic material enclosing the primary induction coil and the secondary induction coil by the gap adjusting means. The operation of the electric element can be easily controlled by hand during the operation, and it is useful for extending the life of the electric bulb.

[Brief description of drawings]

FIG. 1A is a sectional view of a motor-driven handpiece according to an embodiment of the present invention. (B) is a sectional view showing the disposition of the induction coil when the handpiece is separated into a front part and a rear part.

FIGS. 2A and 2B are cross-sectional views of a motor-driven handpiece when a front portion and a rear portion are separated from each other.

FIG. 3A is a cross-sectional view showing a pneumatic turbine type handpiece lip embodiment. FIG. 3B is a sectional view showing the arrangement of the induction coil.

FIG. 4 is a sectional view showing an embodiment of an ultrasonic vibration cutting treatment instrument.

FIG. 5 is a cross-sectional view showing an example of a three-way syringe.

[Explanation of symbols]

1 The front part of the treatment instrument 2 The rear part of the treatment instrument 4 Lighting bulb 5 Ultrasonic transducer 6 CCD image sensor 11 Joint part 12 head 21 grip section 22 Insertion tube 23 Connector 31,32 induction coil 33,34 Ferromagnet 35 End face of opening 62 Image sensor lead wire

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Makoto Numagawa             680 Higashihaman-cho, Fushimi-ku, Kyoto Mori Co., Ltd.             Ta Factory

Claims (2)

[Claims] 1. A lighting bulb, a drive motor, an ultrasonic transducer, and one or more electric elements selected from an image pickup element are built-in, and a rear section and a front section in which the electric elements are built-in are provided. In a dental treatment instrument which is rotatably and detachably connected about a rotation axis, an induction coil electrically connected to the electric element is disposed on a connection surface of the front portion, An induction coil connected to a lead wire from the rear is provided on the connection surface of the rear part, and when the front part and the rear part are connected, both induction coils are coaxial with the rotation axis and coaxially. A dental treatment instrument, which is arranged in close proximity to supply electric power to the electric element and / or transmit an electric signal from the electric element via the both induction coils. 2. The gap adjusting device according to claim 1, further comprising gap adjusting means for adjusting a gap at the connecting surface between the ferromagnetic body enclosing the front induction coil and the ferromagnetic body enclosing the rear induction coil. Dental treatment equipment.