WO1997027813A1

WO1997027813A1 - Dental tool equipped with exclusion device

Info

Publication number: WO1997027813A1
Application number: PCT/JP1996/000162
Authority: WO
Inventors: Shoukou Nakamura
Original assignee: Nakamura Shoko
Priority date: 1996-01-29
Filing date: 1996-01-29
Publication date: 1997-08-07

Abstract

A novel dental device equipped with an exclusion device comprising a dental handpiece, an arm having a vent plate at its front end, and a mounting member for mounting the handpiece and the arm wherein the mounting member is integrally fixed to the body of the handpiece, while the arm is supported on the mounting member so as to be freely movable, rotatable around the axis, and movable in the axial direction and at the same time a plurality of arm inserting holes into which the arm can be selectively inserted are formed, or alternatively the mounting member is integrally fixed to the body of the arm, while a handpiece inserting hole for supporting the handpiece so as to be freely movable, rotatable around the axis, and movable in the axial direction, thereby enabling cutting to be smoothly carried out by a dental surgeon alone at every site to be treated.

Description

Description Dental instruments with retraction device

The present invention relates to a medical device used in a dental clinic, and more particularly, to a novel medical device in which a handpiece for dental use such as an air turbine, a contra, or a vacuum chip used for cutting treatment is combined with a retraction device. For appliances. Conventional technology

In general, when performing a treatment such as cutting in the department, the cutting is performed at the tip. ”A hand bead equipped with a tool, and a vacuum for sucking and removing waste liquid such as a mirror and liquid for observing the condition of the treated part Hems such as chips are used independently.

However, it is difficult for a physician to use all of these devices at the same time by himself / herself, and in particular, a specialized assistant is required to perform the exclusion work, which presses and removes the intraoral tissue with an exclusion tool. .

Therefore, in this type of cutting treatment, a single patient in a supine position is treated by a physician and an assistant, and so-called four-handed dentistry is usually used to heal the sitting position. However, in this case, both doctors and assistants need advanced skills such as Mira-techniques, genuine vacuum techniques, delivery of equipment, etc., and the technical levels of the doctors and assistants do not match And the screw cannot be smoothly run, it takes time, etc. There was a problem. Problems to be solved by the invention

The above-mentioned sitting treatment by our-handed dentistry is extremely useful when performing complicated operations such as surgery, but most of the dentists are cutting teeth and tooth cutting teeth. . The present inventor has attempted to develop a novel medical device capable of performing a smooth cutting treatment only by a physician at all treatment sites in view of such a condition and the problem of the above d.

By the way, the main technical role of Mira et al. In performing cutting treatment on the fangs is to remove the cavity tissue first, and then cut it first. Avoiding contact with the body, secondly, improving the visibility of the cutting tool obstructed by the intracavitary tissue, thirdly, improving the visibility of the healed area, and fourthly, the tooth The main technical role of the suction tube, such as a vacuum tip, is to create a space where the cutting tool can be freely assisted in the periphery.First, it sucks secretions such as saliva generated inside the cavity. Secondly, it is necessary to suck out cutting powder and the like generated during cutting.

U.S. Patent Nos. 5,252,78, 1,004,118, 1,0757,1,110,947, 230,767,2, S7129, 2924013, etc. Discloses various handpiece structures in which a protective plate is attached to the tip of a fang cutter, but these protective plates are designed to prevent the cutting tool from coming into contact with the tissue in the oral cavity. Because the mannequin is arranged on a part or whole of the periphery of the handpiece and attached to an appropriate part near the tip of the handpiece, it is impossible to adjust the position of the tip of the handpiece. Can adjust the position slightly to move Isl at the mounting part, It is not possible to adjust the position of the working burr inside the cavities, and there is no mechanism to exclude the intraoral tissue from the cutting tool.

Therefore, when using this kind of equipment, it is necessary to use a mirror or other retraction tool as in the past, as well as using a handpiece with a protective plate attached. Then, "cutting": there were drawbacks such as the deterioration of the visibility of the tool and the inability to perform proper treatment. Means to solve the problem

The present inventor has seen ship to solve problems above ¾, suction pipe or tooth; effectively bind and y ¹ cutting machine, an arm provided with a rejection plate at the tip portion through a mounting member, u A new medical device that can move the suction tube or cutting machine freely while eliminating the necessary u-lumen tissue with only one finger operation of the doctor in the intra-cavity working block It is.

As shown in the drawing explaining each embodiment of the present invention, this medical instrument has a suction tube or a tooth: a hand bead 1, which collectively refers to a cutting machine, an attachment member 2, and an excluding plate 4 at a tip portion. Arm 3 and has the following features.

That is, the first feature common to the dental instruments opened according to the present invention is that the handpiece 丄 and the arm 3 having the excluding plate 4 attached to the distal end thereof can be handled by the attaching member 2 so that the handpiece and the arm 3 can be handled with one hand. That is, the piece 1 and the arm 3 having the length are quickly connected in parallel at the base end, which is to be the grip portion, with the distal end directed in substantially the same direction.

This structure exhibits excellent operability especially when the handpiece 1 is a suction tube (in contrast, when the hand bead 1 is a tooth cutting machine, Since the movement of the tip of the tooth cutting machine is added, a structure to move the tip of the handpiece 1 is necessary.) Specifically, as shown in the first embodiment, the attachment member 2 fixed to the handpiece 1 has an arm insertion hole 2b, and the arm 3 is provided at a predetermined interval on the outer periphery of the handpiece 1. The suction U 1 d at the tip of the handpiece 1 and the elimination plate 4 at the tip of the arm 3 are inserted into the oral cavity only by one-handed grip operation. These can be positioned around the tusk. In other words, the handpiece 1 and the exclusion plate 4 at the distal end of the arm 3 as an exclusion tool can be handled simultaneously with one hand of the doctor.

The second feature is that the positional relationship between the tip of the hand bead 1 and the rejection plate 4 can be freely adjusted according to the work block.

Specifically, in the second embodiment, the arm 3 is provided with an arm 2b provided in the mounting member 2, so that the movement of the arm 3 is reduced, the axis M is removed, and the movement in the axial direction is | ¾. In the sixth and sixth embodiments, the hand bead に, the rotation around the axis, and the movement in the axial direction can be freely performed by the handpiece hole 2a provided on the mounting member 2. In both cases, the relative position S relationship between the tip of the handpiece 1 and the tip of the arm 3 is variable.

In particular, since the free movement is possible, the arm 3 and the hand bead 1 can perform the opening and closing movement with the mounting member 2 as a fulcrum. The fulcrum can be moved innumerably on a circular orbit on the outer periphery of the arm 3 or on a circular orbit on the outer periphery of the handpiece 1. Rich in variation of relative movement between 4 and the tip of hand bead 1.

By the way, there is a difference in the depth of the U Because the jaw opens and closes using the mandibular head of the temporomandibular joint as a pivot, the space in the oral cavity narrows from the front lip side to the soft palate side at the back, etc. Operated in a limited space at.

For this reason, the positional relationship between the tip of the instrument, that is, the rejection plate 4, the suction port ld, and the cutting tool 1c is very important. However, according to the instrument structure described above, the handpiece 1 centering on the teeth is required. The position of the tip (the suction port 1d or the cutting tool 1c) and the removal plate 4 can be opened even in a limited space in the oral cavity.

In addition, when the handpiece 1 is a tooth cutting machine, the structure of the cutting tool 1 which is the tip of the tooth cutting machine is not changed without changing the position of the exclusion plate 4 that exhausts the intraoral tissue. means that c can move freely with respect to the tooth. A third characteristic feature common to the dental instruments of the present invention is that the dental instrument has a structure capable of using a substantially ^ tube-shaped arm 3. The reason for using the straight arm 3 is mainly for the following reasons.

In other words, if the surface of the elimination plate 4 is a mirror surface in order to use the mirror technique, it is convenient if there is a function capable of removing the S on the mirror surface. To this end, a mechanism is provided that can blow air toward the sales surface of the exclusion plate 4. At that time, an air supply path 16 b is provided in the arm 3 as shown in FIG. 4 at ^ 43, but in order to provide this mechanism, It is optimal. Next, it is often necessary to be able to use the handpiece 1 alone during work related to treatment in the U-cavity. For this purpose, a structure in which the arm 3 can be instantaneously moved to the rear of the handpiece 1 is preferable. Also in this case, the substantially straight-tube type arm 3 is optimal.

The detailed features are described in the following examples. Example

The present invention that has achieved the above object will be described with reference to the drawings of the following embodiments.

FIGS. 1 to 4 are schematic diagrams of a dental device of a first embodiment in which a handpiece is used as a suction tube, and FIGS. 5 to 8 are tooth diagrams of a second embodiment in which a handpiece is used as a suction tube. FIGS. 9 to 12 are schematic views of a dental instrument according to a third embodiment in which a handpiece is used as a suction tube. FIG. 13 is a schematic diagram showing a dental instrument in which a handpiece is used as a suction tube. Fig. 14 is a schematic diagram of a dental instrument of the fourth embodiment, Fig. 14 is a schematic diagram of a dental instrument of the fifth embodiment in which the handpiece is suctioned, and Fig. 15 is a suction instrument of the handpiece. FIG. 16 is a schematic diagram of a dental device of the sixth embodiment in which a handpiece is used as a suction tube, and FIG. 17 is a schematic diagram of a dental device of the seventh embodiment in which a handpiece is used as a suction tube. This is an outline of the dental instrument of the eighth embodiment using a handpiece as a suction tube ^. It is a schematic view showing a different bear-like of the arm. FIGS. 20 to 25 are schematic views of the dental instrument of the ninth embodiment in which the hand bead is a tooth cutting machine. FIGS. 26 and 29 show that the hand piece is a tooth cutting machine. Outline of the dental appliance of the tenth embodiment that was completed! Fig. 30 and Fig. 31 are schematic diagrams of the dental appliance of the eleventh embodiment in which the handpiece was a 5 mm cutting machine. , Zono 32 and FIG. 33 are schematic diagrams of a dental instrument of the first embodiment in which the handpiece is a tooth: if cutting machine, and FIGS. 34 and 35 show that the handpiece is a suction tube. FIG. 36 is an explanatory diagram showing the movement of the handpiece in the case where the handpiece is used. FIG. 36 is an explanatory diagram showing the movement of the hand beads in the oral cavity when the handpiece is used as a suction tube. FIG. 40 and FIG. 41 are explanatory views showing the killing of the tip of a handpiece when a tooth cutting machine is used as a hand wheel. If you and the piece * Fang cutting machine FIG. 42 is an explanatory view showing the killing of the handpiece. FIG. 42 is an explanatory view showing the movement of the handpiece in the oral cavity when the handpiece is a tooth cutting machine. FIG. FIG. 2 is a schematic view showing an embodiment of an arm employed in the present invention.

[Exclusion plate and arm]

In each embodiment of the present invention, a Bg linear member whose tip is slightly bent toward the cutting tool 1c is adopted as the arm 3 inserted into the arm insertion hole 2b of the mounting member 2. You. Then, for example, an exclusion plate 4 having a circular elbow surface is provided at the tip so that the Mira technique can be used. As shown in FIG. 44, this type of arm 3 is provided with an air supply passage 1 in the arm 3 when a mechanism capable of ejecting an air is provided in order to remove the mirror of the exclusion plate 4. It is easy to provide 6b.

[Example in which handpiece 1 is used as suction tube]

In the * apparatus of the following example, the dentist performs the cutting and healing while holding the fang cutter with the other hand while carrying out the suction work and the pressure removal work with one hand. The first to fourth embodiments are examples of the arm floating type surgical device.

[First embodiment]

As shown in FIGS. 1 to 4, the dental appliance provided with the retraction device of the first embodiment uses a handpiece 1 (suction tube) having a slightly bent base end side. At the tip of the handpiece 1, a four-leaf thin plate-like mounting member 2 is integrally fixed to the body of the handpiece 1.

Then, a plurality of pieces (four places in the embodiment) are provided on the outer peripheral portion of the mounting member 2. The arm insertion hole 2b is formed. The arm 揷 inlet hole 2b is used to perform a suction operation and an exclusion operation so that the positional relationship between the distal end portion of the handpiece 1 and the exclusion plate 4 is most appropriate around the tooth to be treated. These are formed at different distances from the outer peripheral surface of the handpiece 1 in the circumferential direction. The arms 3 are free to move freely with a gap to the most appropriate one of the arm entrance holes 2b. Has been introduced.

[Second embodiment]

As shown in FIGS. 5 to 8, the second embodiment differs from the dental instrument having the retraction device of the first embodiment in that the handpiece 1 (suction) having a slightly bent base end side is used. The mounting member 2 has the above-mentioned function and has a different form.

[Third example]

The third embodiment uses a handpiece 1 (suction pipe) having a length with a large ffi-curved tip as shown in Figs. 9 and 2 and a circular arm insertion hole 2b. A ring-shaped attachment member 2 having the following shape is formed, and the attachment member 2 is fixed to a plurality of locations (three locations in the embodiment) on the outer peripheral surface of the bent portion of the handpiece 1. The arm 3 is loosely inserted in any of the arm holes 2b at the port where a gap is formed.

[Fourth embodiment]

In the fourth embodiment, as shown in FIG. 13, a mounting member 2 composed of a circular member and a ring member having a slight width protruding toward the center of a side portion of the circular member is used. ing. Then, the arm 3 is loosely inserted into the arm insertion hole 2b of the mounting member 2 with a gap formed, while the body of the handpiece 1 is inserted from the tip into the hand bead insertion hole 2a, ^ State of the song Is fitted and fixed.

In each of the above embodiments, the cross-sectional shape of the arm insertion hole 2b is a polygonal shape, while the cross-sectional shape of the outer peripheral surface of the arm 3 is different from the cross-sectional shape of the arm insertion hole 2b. It has a square shape. This allows the arm 3 to slightly rotate and move in the axial direction, but can restrict rotation around the axis during gripping. This is because the reaction force received from the tissue in the U cavity at the time of exclusion is mainly the turning force of the arm 3, and the tissue in the oral cavity can be reliably pressed by the finger operation by this restricting means.

The fifth embodiment and the sixth embodiment are examples of the handpiece destroying dental instrument.

[Fifth embodiment]

In the fifth embodiment, as shown in FIG. 4, a mounting member 2 composed of a circular member and a ring-shaped member having a small width protruding toward the center of the side of the circular member is used. I have. Then, the torso of the handpiece 1 is loosely inserted from the tip into the handpiece insertion hole 2a with a gap formed therebetween, while the arm 3 is inserted into the arm insertion hole 2b. For example, it is fixed by bolts 5 which are joined from the circumferential direction, for example, with retaining bolts.

[Sixth embodiment]

As shown in Fig. 15, the sixth embodiment uses a split sleeve having a C-shaped cross section and a mounting member 2 formed of a circular member protruding coaxially to the side of the split sleeve. . Then, the body of the hand bead 1 is gently inserted from the tip or the like with a gap formed in the handpiece 揷 insertion hole 2a, while the arm 3 is inserted into the arm zen insertion hole 2b and is inserted from the circumferential direction. It is fixed with the combined bolt 5. [7.8th embodiment]

The seventh to eighth embodiments show examples of dental instruments provided with a stopper means as shown in FIGS. 16 and 17. In the first embodiment to the β-th embodiment described above, the handpiece 1 can be used alone at any time during the operation, and the handpiece 1 can be used again with the elimination plate 4 at the tip of the arm 3. It is desirable that the tip of the handpiece 1 can be easily positioned. For this reason, as in the seventh embodiment, when the arm 3 is free to move, the stopper means 6 is provided to restrict the axial movement of the arm 3 on the outer peripheral surface to the rear side of the arm insertion hole 2b. As in the eighth embodiment, when the handpiece 1 is free to move, the stopper means 6 for restricting the axial movement to the ^ part side of the handbee's god's hole 2a on the outer periphery of the handpiece 1 is provided. . In the above configuration, you can push the arm 3 backward, and use the handpiece 1 alone. When the arm 3 is driven backward, the expulsion plate 4 is attached to the tip of the arm 3, so that the arm 3 does not come off in contact with the edge of the mounting member 2. FIGS. 18 and 19 are examples in which the arm 3 is bent according to the shape of the hand bead 1-[How to use the instrument when the handpiece 1 is a suction tube]

When handpiece 1 is used as a suction tube, the tooth is centered on all treatment sites, using mirror techniques as necessary, so that the cutting operation with the tooth cutting machine held by the other hand can be performed smoothly. It is important to create a working space that has been established. On the other hand, in the medical instrument provided with the above-described rejection device, as shown in FIGS. 34 to 36, the suction port Id of the handpiece 1 (suction pipe) involved in the suction operation is connected to the retraction device. The expulsion plate 4 of the arm 3 according to the above condition can be removed, specifically, the tissue in the U cavity can be excluded. At the time of centrifugal cutting, while maintaining the angle at which the mirror surface of the exclusion plate 4 can be observed, the suction tool C1d is positioned on the side of the tooth, and the cutting tool of the tooth cutting machine is used. An optimal positional relationship can be achieved, which creates a space in which 1 c can move. Figs. 34 and 35 show the basic positional relationship between the exclusion plate 4 and the suction port 1d. The mounting member 2 is hidden under the user's hand. Let me.

Rotational movement of the arm 3 around the axis can be prevented by the grip operation by the user and the mounting structure of the arm 3. Therefore, the suction port 1 d, which is the tip of the handpiece 1, is applied to the side of the tooth while the mouthpiece moth is pressed firmly by the exclusion plate 4, so that the suction operation can be performed. The angle of the suction port 1d and the angle of the exclusion plate 4 are basically in the basic form as shown in Figs. 34 and 35, but the arm suction hole 2b is In the case where a plurality of arms are formed on the outer periphery of the handpiece 1 as described above, if the arm 3 is selectively inserted into the arm hole 2b, for example, in FIG. The louvering plate 4 can be positioned on the right side, on the left side, on the left side of the suction U 1 d.

During treatment, the doctor grasps the present invention with one hand and grasps the tooth cutter E with the other hand, as shown in Fig. 36, and is targeted for treatment. Operate the tip of the tooth cutting machine E while removing the oral tissues such as the tongue A and the flesh C outside the teeth B with the vacuum tip 1 and the discharge plate 4 at the site, and suctioning saliva. The figure shows the exhaustion of the dental instrument provided with the retraction device of the first embodiment at the back of the forehead, but the same applies to the other examples. It can be used for all treatment sites regardless of their position relative to each other. [Example in which handpiece 1 is used as a tooth cutting machine]

In the dental instruments of the following examples: * The physician performs suction while holding the suction tube with the other hand while performing cutting freezing and exclusion with one hand.

The handpiece 1, which employs a gynecological instrument equipped with this retraction device, is a general-purpose tooth cutting machine having a grip at the body, and rotates at a high speed at the tip by a drive source such as air or a motor. It has a rotating body 1b and a cutting tool lc attached to the rotating body 1b.

[Ninth embodiment]

As shown in FIGS. 20 to 25, the surgical instrument provided with the exclusion device according to the ninth embodiment has a gap between the body of the hand bead 1 and the handpiece insertion hole 2a of the circular attachment member 2. G is formed so as to be loosely inserted, and a C-shaped or ring-shaped striker means 6.6 made of metal or an elastic body is attached to one side of the attachment member 2.

[10th embodiment]

As shown in FIGS. 26 and 127, the surgical tool provided with the retraction device of the tenth embodiment has a mounting member 2 formed of a ring-shaped or C-shaped member. The body of the handpiece 1 is loosely attached so that a gap G is formed in the hand bead insertion hole 2a of the member 2. As in the ninth embodiment, stopper means 6.6 formed of a member having a C-shaped or ring-shaped cross section is fitted and fixed to both sides of the mounting member 2 of the hand bead 1. The shape of the mounting member 2 may be a circular ring-shaped member as shown in FIG. 28 or an oval ring-shaped member as shown in W 29.

[Example 11]

* Equipment equipped with the retraction device of the first embodiment is shown in Figs. 30 and 31. As shown in the figure, a mounting member 2 having a handpiece insertion hole 2a having a taper opposite to the taper of the handpiece 1 is used. The torso of the handpiece 1 is loosely attached to the handpiece opening 2a of the mounting member 2 so as to form a squadron G. In this embodiment, the stopper means 6 is attached to the mounting member 2 It is attached only to the tip side of

[Example 12]

FIG. 32 and FIG. 33 show a 12th embodiment of the present invention. In the dental instrument provided with this retraction device, the arm 3 is freely mounted with a slight gap G provided in the arm insertion hole 2 b of the mounting member 2. Can perform the same motion as Bg in the first to third embodiments. When the arm 3 is freely movable as described above, the cut-off fif shape of the arm insertion hole 2b and the cross-sectional shape of the arm 3 are polygonal, and the movement of the shaft I port of the arm 3 is prevented. The block 6.6 is a storage means fixed to the outer peripheral surface to prevent the arm 3 from coming off.

[How to use instruments when handpiece 1 is a tooth cutting machine]

If handpiece 1 is used as a tooth cutting machine, it is important to kill the tip of the tooth cutting machine for cutting treatment. On the other hand, in the dental instrument provided with the retraction device having the above-described configuration, the cutting tool 1c has extremely high flexibility in addition to the change in the shape of the instrument in a narrow space.

Specifically, as shown in Fig. 37, the cutting tool 1 c is turned around the axis IH) while pressing the tissue in the U cavity with the exclusion plate 4 as shown in Fig. 37 by finger operation during work in the oral cavity. As shown in FIG. 38, the cutting tool 1c can be applied to a tooth by moving the cutting tool 1c in a three-dimensional direction such as a vertical or horizontal direction. Fig. 39 shows the idea that the oral tissue such as tongue A was pressed by the exclusion plate 4. c moves freely around tooth B.

Fig. 40 shows a state in which the tip of the handpiece 1 is moved in the vertical direction with the expulsion plate 4 stopped at a fixed position, and Fig. 4: 1 shows the expulsion plate 4 stopped at a fixed position. In this state, the tip of handpiece 1 is moved horizontally. Other movements can be easily imagined from these schematics.

At the time of treatment, as shown in Fig. 42, the doctor grasps the dental instrument equipped with the handpiece 1 and the retraction device with one hand, and grasps the vacuum tip D with the other hand. The distal end of the handpiece 1 is finger-moved while removing the U-cavity tissue such as the flesh C outside the tongue A and the teeth B with the vacuum tip 1 and the exclusion plate 4 at the target site. Manipulate. The figure shows a state in which the dental appliance provided with the retraction device of the 0th embodiment is used at the back of the lower forehead, but the same applies to other embodiments. It goes without saying that the same can be used for any treatment site regardless of the above. The invention's effect

The dental instrument provided with the exclusion device of the present invention can be easily used simply by attaching it to a general-purpose handpiece because of the configuration described above, and the dentist has the exclusion device of the present invention. With the use of dental instruments, it is possible to freely operate the cutting tool of the tooth cutting machine and the tip of the suction tube in the intended direction, while eliminating the necessary intraoral tissue with the rejection plate. At the treatment site, the doctor can perform a smooth cutting treatment only by the physician himself, for example, in the manner of operations such as routine use by Japanese people during meals. That is, The most distinctive function and effect of this dental device is that the shape of the distal end of the entire device can be inserted into the narrow space at the back of the oral cavity from a relatively large space on the near side of the oral cavity by a doctor's finger operation. In addition to being able to change the handpiece, the handpiece can be moved to the other finger while applying a strong pressing force to remove the intraoral tissue with any finger to the rejection plate at the end of the arm. With a finger to the tip of the arm, press the tissue inside the U cavity, such as the tongue and the 排除, firmly with the rejection plate. The tip of the can be moved freely in three dimensions. By using the dental instrument having the retraction device i of the present invention, the work of the dentist and the work of the assistant, which have been performed by the conventional four-handed dentis try and the cutting scropper, can be performed independently by the dentist. * Medical treatment can be performed more efficiently. Explanation of the mark

A: Tongue, B ..., C: Meat, ϋ: Suction tube (vacuum tip), t: Tooth cutting machine, 1 ... Handpiece, lb rotating body, lc cutting tool, Id suction U, 2 ... Mounting Member, 2a handpiece 揷 insertion hole, 2b arm insertion hole, 2c butterfly hole, 3… arm, 4… exclusion plate, 5… bolt, 6… stopper

Claims

The scope of the claims

1. A dental instrument comprising: a dental handpiece, an arm having a distal end provided with an exclusion hole, and a mounting member for mounting the handpiece and the arm, wherein the mounting member is a handpiece. An arm insertion hole is formed integrally with the body, and the mounting member has an arm insertion hole for supporting the arm while freely moving, rotating around the axis, and moving in the axial direction. Dental instrument with retraction device.

2. A dental instrument provided with an exclusion device described in claim i of the claims, wherein ii the iHl movement restricting means for restricting the movement of the shaft iPl of the ti arm is submerged. Dental instrument with device.

3. In the medical device provided with the exclusion device described in claim 1 of the claims, a stop-step is provided on the outer periphery of the arm to limit the amount of movement in the axial direction. ^ Family appliances with rejection device.

4. The medical device J provided with an exclusion device for stimulation according to claim 3 of the present invention, wherein the stopper means is provided on the rear side of the arm insertion hole. Dental instruments.

5. A dental instrument provided with the ejection device according to claims 1 to 4, wherein the handpiece is a tooth cutter or a suction tube or the like. Dental instruments.

6. In the medical instrument equipped with an exclusion device according to claims (5) and (5), a plurality of front arm insertion holes are provided in the outer peripheral direction of the hand bead, and the respective arm insertions are provided. A medical device provided with an exclusion device, which is characterized in that the arm can be selectively inserted into the hole. 7

WO 97/27813 PCT / JP96 / 00162

'/, y family Hand heat and: Exclusion plate at the tip ¾: Arm provided, ¾ Han I,' Consists of mounting member to attach bead and arm; w family with earth removal equipment is In the container 前, the front ui mounting member is integrally に! -Illuminated on the body of the arm, and the mounting member is provided with hand beads floating, M IP of the shaft IPI and transfer of the shaft カ! rr にし支持支持支持支持支持支持支持支持支持支持 ¾ ¾ ¾ ¾ ¾;

In the application device with nd ^ o pressure relief device in i7 in the range of special requirements, ¾ ¾ 外周外周外周外周外周外周外周外周外周外周する外周外周するする外周するするツするするする外周外周するする 7 "" ¾ · 'Surgery instrument with rejection that is characterized by the provision of a step,.

It is equipped with a £ Κ discharge device ίδ: characterized in that the stopper means is opened on the lower side of the hand hole.科 · Equipment ^.

1. Special

^ の fi fi W W W W W W W W W W W ビービー W W W W W W W W W ビーにおいてビーにおいて科科科ビービーにおいてにおいて科| ¾ Departmental appliances.

1 丄. The mounting end was attached to the base end of the suction tube and the base end of the arm provided with the exclusion plate at the end. : H.