JPH06296623A - Hand piece - Google Patents

Abstract

PURPOSE:To protect secondary infection in a dental treatment such a AIDS, hepatitis, etc., by letting a handle and a cartridge be separate parts, and attaining a use purpose of the hand piece by docking integrally each of them with one operation, whenever it is used. CONSTITUTION:A handle 1 and a cartridge 3 are made to be separate parts, respectively. The handle 1 of them consists of a pipe-shaped structure body consisting of a metal or a high heat resistance resin being free from alteration, deformation and corrosion, and can be subjected to complete sterilization and washing having no fear of a fault of a rotation driving part, in a high temperature liquid such as boiling water, etc., or in a high temperature sterilization furnance. On the other hand, the cartridge 3 is constituted of a plastic formed part with respect to all parts except a bearing. Also, in a casing 4 for constituting the cartridge 3, a cylindrical part into which the handle tip part 2 of the handle 1 is fitted is provided. In such a way, the handle with stands high temperature sterilization executed repeatedly, complete sterilization and high temperature washing are possible, and the cartridge is disposable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a handpiece as a dental medical instrument.

[0002]

2. Description of the Related Art In a conventional handpiece, a handle portion and a handle tip portion to which a rotary drive unit can be attached are integrated by welding or screwing, and the rotary drive unit is inserted into a casing of the handle tip portion and then a cap is used. It is generally used by screwing, fixing and integrating.

[0003]

In the field of dentistry, the risk of secondary infections such as AIDS and hepatitis is extremely high due to the handpiece among many therapeutic instruments. ing.

The reason is that instruments such as pliers and tweezers can be sterilized or sterilized with little trouble in boiling water liquid or in a high temperature sterilization furnace and can be used repeatedly, but the internal structure of conventional handpieces is small. It requires high speed rotation and is composed of precision parts including bearings. Therefore, after repeated high temperature sterilization, it is necessary to replenish the bearing with lubricating oil, but the lubrication state cannot be confirmed.

Further, since a complete seal is not possible due to the internal structure, it cannot be washed to remove the residue after sterilization unless the unit containing the rotating mechanism such as the turbine and the bearing is removed.

An object of the present invention is to fundamentally solve these problems and provide a handpiece capable of protecting secondary infections in dental care such as AIDS and hepatitis.

[0007]

In order to achieve the above-mentioned object, the present invention separates a handle (1) and a cartridge (3) containing a rotary drive of a bar (21) from each other. And the casing (4) for this cartridge (3)
A tubular portion (4a) into which the tip portion (2) of the handle (1) is fitted, and a cartridge (3)
The main point is that all parts except the bearing are made of plastic molded products.

[0008]

According to the present invention, the handle (1) and the cartridge (3) are separate parts, and the purpose of use of the handpiece is achieved by docking and integrating them with one touch each time of use. Due to the separation of the two parts, the handle (1) withstands repeated high temperature sterilization to protect against secondary infections such as AIDS and hepatitis, which are rapidly increasing.
It enables complete sterilization and high-temperature washing for residue removal.

A cartridge (3) having a built-in rotation driving unit which can be attached / detached to / from the handle end (2) with one touch.
Can be made disposable to ensure hygiene and safety.

[0010]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 is a side view before docking showing one embodiment of a handpiece of the present invention, FIG. 2 is a plan view of the same as above, and FIG. 5 is a side view after docking.

The handle (1) and the cartridge (3) are separate parts, of which the handle (1) is a simple pipe-like structure made of metal or high heat resistant resin which is free from alteration, deformation and corrosion. In a high-temperature liquid such as boiling water or in a high-temperature sterilization furnace, complete sterilization and washing can be performed without the risk of failure of the rotary drive unit.

The handle tip (2) of the handle (1) is an angled portion of the body of the handle (1).

Then, as shown in FIG. 4, the handle (1)
On the rear end face, a turbine rotation air supply pipe (32), a water pipe (33) for mixed spraying of air and water, an air pipe (34) and an exhaust pipe (35) are provided, which is used as an operating table for dental treatment. Compressed air and water are supplied by the connecting tube connector, and the air supply pipe (32), the water pipe (33) and the air pipe are attached to the front end surface of the handle (1) as shown in FIG. Each (34) protrudes into place.

On the other hand, in order to make the cartridge (3) disposable and inexpensive, all the parts except the bean rings (12) and (12 ') are made of plastic molded products.

As shown in FIGS. 6 and 8, the casing (4) constituting the cartridge (3) has a tubular portion (4a) into which the handle tip (2) is fitted, with its opening at the rear end. A concave ring groove (5) is provided on the inner peripheral surface of the cylindrical portion (4a) near the rear end of the tubular portion (4a) so as to prevent it from coming off when it is integrally docked with the handle (1). .

On the other hand, the handle (1) has
In order to integrate docking, a mountain-shaped ring (6) protruding in accordance with the position of the concave ring groove (5) formed on the inner peripheral surface of the casing (4) is provided on the rear end of the handle front end (2). The handle (1) and the cartridge (3) are pressed together in the directions (7) and (7 ') of the arrow so that they can be docked and integrated with one touch.

Further, when the handle (1) and the cartridge (3) are separated, they can be separated with one touch by pulling the arrow directions (8) and (8 ') to each other.

In front of the mountain-shaped ring (6) of the handle (1), an R-concave key groove (9) is attached to the inner peripheral surface of the tubular portion (4a) of the casing (4). Is provided with an R-shaped key (10) protruding in the vertical direction, and the key (10) is engaged with the key groove (9) to prevent the cartridge (3) from rotating during docking.

As shown in FIG. 10, from the top surface of the head of the casing (4) of the cartridge (3), the turbine rotating shaft (11)
Then, the turbine assembly assembled in the order of the bearing (12), the flange (26), the bearing (12 ') and the pressurizing retainer (27) was inserted into the rotary drive part.

The bearing rings (12) and (12 ') act to rotate the outer ring in the direction of rotation due to inertia at the time of starting rotation, so that the outer ring is fixed and smooth rotation of the bearing ring sphere is smoothed. Need that.

Further, the above-mentioned bear ring (12) (12 ') is built in the turbine rotating shaft (11) with the turbine blade in the central part sandwiched between them, but it is formed on the inner and outer rings of the rolling surface of the bearing ball. Because of the R-shaped groove, there is an axial gap, which causes looseness of the inner and outer rings in the thrust direction. This axial gap is spring-like elasticity so that the tip of the bar (21) can always be kept constant according to changes in radial and axial loads during cutting, and is suitable for the inner and outer rings of the bearings (12) (12 '). It is necessary to apply pressure.

Further, as described above, in order to sufficiently exert the bearing ring performance, the load fluctuations in the thrust direction and the radial direction generated during the cutting work of the bar (21) are absorbed, and the bar is smoothly rotated by a constant pressurization. , It is necessary to prevent the outer ring from rotating due to inertia.

A cap (16) for accommodating the turbine assembly in a fixed position is fitted on the upper surface of the head of the casing (4).
The inner circumference of the upper surface of the head of the casing (4) is tapered (2
8) and the side surface of the cap (16) is a taper (28 ') that engages with the taper fitting portion (28).

A casing tip head portion (29) for heating car rig fusion is secured above the tapered fitting portion (28) of the casing (4), and a polygon is provided below the tapered fitting portion (28). Mold the surface (14 ').

The outer peripheral cylindrical shape of the pressurizing retainer (27) is a polygonal surface (14), and the polygonal surface (14 ') at a position opposite to the inner cylinder pressurizing retainer (27) of the casing (4).
Has a small clearance that allows the polygonal surface (14) to slide up and down.

As shown in FIG. 11, this pressurizing retainer (2
The outer ring holder (13) on the inner circumference of 7) is
The outer ring of 2 ') is molded into a size that can be press-fitted, and the outer ring of the bean ring (12') is fixed. And bear ring (1
2) and the elastic ring (15), which is the top plate of the pressurizing retainer (27) in order to properly maintain the axial gap between the ring (12 ') and the ring (12'), has a rib-shaped ring () that contacts the end surface of the cap (16). The end face of 17) creates a wave-like elastic curved surface during assembly and pushes down the outer ring of the bearing (12 ') with an appropriate pressure, and the spring-like elasticity causes the pressure retainer (27) to move up and down as a whole. I was able to keep the axial gap constant at all times.

By the way, in the cutting work with the handpiece, the bar (21) is surely chucked when the turbine rotates at a high speed, and the vibration due to the center deviation is caused due to the slight deviation of the shaft diameter tolerance of the bar (21). It is necessary to ensure chucking without awakening.

Therefore, it is assumed that the inner diameter cylindrical structure of the turbine rotating shaft (11) is composed of a straight cylindrical portion (20), a stop portion (18) and a tapered cylindrical portion (19) in the middle thereof.

The straight cylindrical portion (20) maintains the straightness holding accuracy of the bar, and the tapered cylindrical portion (19) completely secures the chucking of the bar (21) by plastic plastic elasticity.
Prevents the bar (21) from loosening and falling off even when the turbine rotates at high speed.

The stop cylinder portion (18) is a cylinder having a diameter smaller than that of the bar (21) so that the bar (21) can be stopped at a fixed position when the bar (21) is inserted so as to prevent the bar (21) from projecting through.

Next, usage and operation will be described. When reaching the end of the handpiece, move the tip (2) of the handle (1) and the cartridge (3) toward each other in the direction of the arrow (7).
Docking integrated with (7 ').

A mountain-shaped protruding ring (6) and an R-shaped keyway (9) are provided on the handle tip (2) of the handle (1).
The concave ring groove (5) on the inner peripheral surface of the cylinder of the cartridge (3) and the protruding key (10) are fitted to each other to prevent the retainer and the detent.

The bar (21) firmly fixed by the straight cylindrical portion (20) and the tapered cylindrical portion (19) provided on the inner peripheral surface of the turbine rotating shaft (11) is provided with a turbine rotating air supply pipe (32). The air that is further pumped and accelerated by the compressed air injection hole (30) rotates in conjunction with the high speed rotation of the turbine.

The heat generated when the high-speed rotating bar (21) is applied to the dental affected area for cutting is generated by the water pipe (33) and the air pipe.
It passes through (34) and reaches the spray holes provided in the casing (14) of the cartridge (3), respectively, and the mixture injection holes (36) that are obliquely drilled form a spray-like shape to cool the bar (21) and the affected area. To do.

Depending on the condition of the affected area, the turbine rotating shaft (11)
The fluctuating load is applied in the radial direction and the thrust direction to the bar (21) fixed to the turbine (21), and the same fluctuating load is also applied to the turbine rotating shaft (11).

The bearings (12) and (12 ') always require stable rotation of the bearing balls against the above-mentioned fluctuating load, but in order to rotate the radial load and the thrust load with respect to the torque within the allowable range without difficulty. The bearing (1
2) The axial clearance of (12 ') must be maintained by constant pressure.

The pressurizing retainer (27) performs the following functions in order to maintain the axial gap of the bearing by a constant pressurization. Due to the polygonal surface (14) on the outer periphery, the polygonal surface (14 ') facing the casing (4) moves up and down with a small clearance that can slide, against overload at the start of rotation and cutting. And bearing by inertia (12 ')
To prevent the outer ring from rotating. The elasticity imparting part (15) is a film ring and
Keep a constant pressure on the bearing by spring-like elasticity through the ring (17) that contacts the inner end face of 6). The outer ring holding portion (13) fixes the outer ring by an inner cylinder peripheral surface that can always apply an appropriate pressure of a slip detent that can prevent slip of the outer ring due to inertia during rotation of the bearing (12 ').

Due to the three functions of the pressurizing retainer (27), the turbine rotating shaft (11) and the bar (21) can smoothly keep rotating with respect to the torque within the allowable range.

A turbine blade is formed on the outer periphery of the turbine rotating shaft (11), and a flange is integrally formed on one side of the turbine rotating shaft (11) in order to prevent expansion of the tip of the turbine blade due to centrifugal force due to high speed rotation.

Insert one of them by inserting the flange (26)
Both end surfaces are closed, bucket-shaped turbine blades are formed,
The energy of the jet air can be converted to the maximum rotational energy.

The bar (21) is formed by the straight cylindrical portion (20) and the tapered cylindrical portion (19) on the inner cylindrical surface of the turbine rotating shaft (11).
It is held vertically and firmly held and rotated by the elastic chucking torque. The rear end of the bar (21) has a bar (2
The stop cylinder (18) having a diameter smaller than that of 1) stops at a fixed position without protruding through.

In the manufacturing process of the handpiece of the present invention, as described above, the taper fitting portion (28) between the casing head of the cartridge (3) and the cap (16) is
The turbine assembly assembled in the order of the bearing (12), the flange (26), the bearing (12 ') and the pressurizing retainer (27) was inserted into the turbine rotating shaft (11) from the upper surface of the head of the casing (4). After that, the cap (16) is fitted and mounted, and a confirmation inspection for normal rotation is performed.

Then, after confirmation, the head end (29) of the casing is fusion-bonded with a heating car rig to complete the assembly.

In this inspection process, in the case of a defective rotation product, in order to re-inspect whether or not it is based on the assembly procedure of parts of specified dimensions, the cap ( 16) Remove and take out the turbine assembly.

Cartridge (3) for conducting inspection work
Compressed air is sent from the compressed air injection hole (30a) to check the rotation, but the cap (16) is prevented from floating and fixed by the injection pressure of the compressed air even before the heating curling fusion, so that the cap is fixed. The side of the cap (16) is tapered (28
′) And the taper fitting part (28) of the casing (4) are fitted and snap-fitted for inspection.

After confirming that the operation is normal, the head end portion (29) of the casing is heated and curled to be integrated.

When the affected part is to be deleted by hand bead, appropriate removal treatment is performed by exchanging several kinds of bars (21) having different tip shapes depending on the condition of the affected part.

The bar (21) can be quickly attached to and detached from the cartridge (3), and the replaced bar (21) needs to be securely chucked even if there is a diameter difference within the dimensional tolerance range. . For reliable chucking and attachment / detachment of the bar (21), the bar (21) is firmly chucked by the plastic plastic elasticity of the tapered cylindrical portion (19), so the bar (21) is inserted and removed. A large amount of torque is required for the work, and the bearings must be attached and detached without damage to the bearing due to excessive load during the insertion and extraction work.

Therefore, the present invention uses an attaching / detaching jig (31) as shown in FIG. The attaching / detaching jig (31) is
A two-divided cavity having the same shape as the head of the cartridge (3) and having the same shape can be freely opened and closed by a hinge. The vertical direction of the cavity of the attaching / detaching jig (31) is the same as the length of the turbine rotating shaft (11) built in the cartridge (3).

The attachment / detachment jig (31) has the same cylindrical diameter as the bar (21) when the attachment / detachment jig is closed by the right and left symmetrical R-shaped portions of the attachment / detachment jig. When the bar is pressed in, the insertion guide part (25), which is a part that straightly slides, and the left and right symmetrical R-shapes of the detachable jig that can be opened and closed, like this insertion guide part (25). When the left and right sides of the attachment / detachment jig are closed, a push-out guide portion (37) having a cylindrical diameter identical to that of the stop cylindrical portion (18) and having a function of sliding the pin (24) straight is provided.

Further, the attachment / detachment jig (31) has a jig (23) for extracting the bar (21) integrally provided with the pin (24).
, And the insertion jig (22) having a concave taper at the tip of the bar (21) are integrally molded, and are arranged above and below the two-divided external shape of the cartridge (3).

In this way, when the head of the cartridge (3) is wrapped by closing the attachment / detachment jig (31) for molding the cavity into a vertically split left-right symmetrical shape, the bar (21) is pressed and inserted. The tip of the bar (21) is applied to the insertion jig (22) having a concave taper at the tip, and the bar (21) is press-fitted from the insertion guide (25).

In extracting the bar (21), the pin (24) of the extracting jig (23) is inserted into the pushing guide portion (37) and the stop cylinder portion (18) of the turbine shaft (11) and then pressed. The bar (21) firmly chucked in the tapered cylindrical portion (19) of the turbine rotating shaft (11) can be removed.

Due to the above structure and operation, the turbine shaft (11) and the bearings (12) and (12 ') are prevented from moving up and down by the attachment / detachment jig (31), so that the roller surface of the bearing and the bearing ball are overloaded. It is possible to repeat the work of attaching and detaching the bar (21) without damaging it. Further, due to the sliding effect of the insertion guide portion (25) and the push-out guide portion (37) of the bar (21), it is possible to prevent bending deformation of the bar (21) and damage of the tip cutting edge due to the attachment / detachment work.

[0055]

As described above, in the handpiece of the present invention, the handle and the cartridge are separate parts, and the purpose of use of the handpiece is achieved by docking and integrating them with each other with one touch each time of use. so,
By separating the two parts, the handle withstands repeated high temperature sterilization, complete sterilization and high temperature washing to remove residues, and Cartridge secures hygiene and safety by making it disposable. Therefore, it is possible to protect against secondary infection in dental care such as AIDS and hepatitis.

[Brief description of drawings]

FIG. 1 is a side view of a handpiece according to an embodiment of the present invention before docking.

FIG. 2 is a plan view showing an embodiment of the handpiece of the present invention before docking.

FIG. 3 is a front end view of the handle.

FIG. 4 is a rear end surface of a handle.

FIG. 5 is a side view after docking showing an embodiment of the handpiece of the present invention.

FIG. 6 is a vertical side view of the cartridge.

7 is a cross-sectional view taken along the line AA of FIG.

FIG. 8 is a cross-sectional plan view of the cartridge.

9 is a cross-sectional view taken along the line BB of FIG.

FIG. 10 is an exploded perspective view of a cartridge.

FIG. 11 is a partially cutaway perspective view of the pressurizing retainer.

FIG. 12 is a perspective view of an attachment / detachment jig for a cartridge and a bar.

[Explanation of symbols]

 (1) ... Handle (2) ... Handle tip (3) ... Cartridge (4) ... Casing (4a) ... Cylindrical part (5) ... Concave ring groove (6) ... Mountain-shaped ring (7) ( 7 ') (8) (8') ... arrow (9) ... key groove (10) ... key (11) ... turbine rotating shaft (12) (12 ') ... bearing (13) ... outer ring holding part (13') … Bearing outer ring (14) (14 ′)… Polygonal surface (15)… Elasticity imparting part (16)… Cap (17)… Ring (18)… Stop cylinder part (19)… Tapered cylinder part (20)… Straight cylinder Part (21)… Bar (22)… Insertion jig (23)… Extrusion jig (24)… Pin (25)… Insertion guide part (26)… Flange (27)… Pressure retainer (28)… Taper fitting Mating part (28 ') ... Taper (29) ... Casing tip end part (30) (30a) ... Compressed air injection hole (31) ... Attachment / detachment jig (32) ... Air supply pipe (33) ... Pipe (34) ... air pipe (35) ... exhaust pipe (35 ') ... exhaust hole (36) ... mixed injection holes (37) ... extruded guide portion

Claims (8)

[Claims] 1. A casing (4) constituting the cartridge (3), wherein the handle (1) and the cartridge (3) containing the rotary drive part of the bar (21) are separately detachable parts. ) Is provided with a tubular portion (4a) into which the tip portion (2) of the handle (1) is fitted. 2. The cartridge (3) comprises plastic moldings for all parts except bearings.
The listed handpiece. 3. A cylindrical ring portion (4a) of the casing (4), which is formed by docking with the distal end portion (2) of the handle (1) and uses a plastic ring-like elastic groove to prevent slipping out when the handle (1) is integrated. 5) is formed on the inner peripheral surface, while the concave ring groove (5) is formed on the tip portion (2) of the handle (1).
The handpiece according to claim 1 or 2, wherein a chevron-shaped ring (6) that engages with is formed on the outer peripheral surface. 4. The chevron-shaped ring (6) of the handle (1).
A key groove (9) having an R-shaped recess is provided in front of the casing, and an R-shaped key (10) protruding in the vertical direction is provided on the inner peripheral surface of the tubular portion (4a) of the casing (4). The handpiece according to any one of claims 1 to 3. 5. Cartridge (3) casing (4)
Insert the turbine assembly assembled in the order of bearing (12), flange (26), bearing (12 ') and pressurizing retainer (27) from the top surface of the head to the rotary shaft (11) of the rotary drive unit. To form this pressure retainer (2
7) is an outer ring holding part molded to a size that allows the outer ring of the bean ring (12 ') to be press-fitted, and the outer ring of this bean ring (12') is pressed down with appropriate pressure, and the spring-like elasticity causes the entire The handpiece according to any one of claims 1 to 4, wherein an elasticity imparting portion is provided which can be operated up and down to always keep the axial gap constant. 6. The inner diameter cylindrical structure of the turbine rotating shaft (11) has a straight cylindrical portion (20) for maintaining straightness of the bar and a penetrating protrusion of the bar (21) as a cylinder having a diameter smaller than that of the bar (21). The handpiece according to any one of claims 1 to 5, comprising a stop cylindrical portion (18) for preventing and a tapered cylindrical portion (19) in the middle thereof. 7. The inner periphery of the upper surface of the head of the casing (4) is a tapered fitting portion (28), and the side surface is tapered (28 ').
The handpiece according to any one of claims 1 to 6, wherein a cap (16) capable of being snapped is fitted as said. 8. A two-divided cavity having the same length as the head of the cartridge (3) and having the same shape can be freely opened and closed by a hinge, and the insertion guide part (25) and the extrusion guide part (37) can be opened and closed. ), The pin (2
4) An integral jig (23) for the bar (21)
The handpiece according to any one of claims 1 to 7, characterized in that a bar and a bar (21) are combined with an insertion jig (22) having a concave taper.