JP3137319B2 - Dental care handpiece - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dental handpiece used for dental treatment and the like. More specifically, the present invention relates to a dental medical handpiece, which is a so-called air turbine handpiece, in which a tool such as a cutting bar provided at a distal end portion rotates at a high speed by rotating a turbine.

More specifically, the present invention relates to a head, a grip, and a joint in which a rotary member having turbine blades is provided, and a head, a grip, and a joint, which are connected to each other, and in an internal space (inner cavity) of the joint. Various working media (eg, pressurized air, pressurized water, light guide for illuminating affected area, etc.) detachably engaged with
The present invention provides a highly functional and economical dentistry handpiece having a structure having a working medium conduit for supplying the dentistry.

[0003]

2. Description of the Related Art Recently, in the field of medical practice, it has become a serious problem that infectious agents such as AIDS virus and hepatitis virus are transmitted from patient to patient through a medical device. The above-mentioned problems are not an exception for dental or surgical medical handpieces (hereinafter referred to as dental medical handpieces or simply handpieces) used for dental medical care or surgical medical care.

[0004] The aforementioned problems stem from the reuse of dental handpieces, and as a means of cutting off the route of transmission of infectious agents, the handpiece must be completely sterilized or There are two ways to use a new handpiece for each patient. However, the sterilization method described above is not complete. In addition, using a new handpiece for each patient imposes high medical expenses on the patient because the conventional handpiece is expensive.

[0005] In this regard, recently, various disposable handpieces have been proposed, which are used for one patient and then disposed of. However, these disposable types have poor performance from the beginning because of their emphasis on economics, or have reduced performance or become unusable during treatment, making it impossible to perform complete and sufficient dental care. There is a problem that.

For example, a conventional disposable-type synthetic resin (plastic) handpiece for dentistry has a single function such that a cutting bar disposed at the tip cannot be replaced. Is the majority,
Further, their performance and functions are extremely inferior to conventional general-purpose products. For this reason, in one treatment of one patient, it is necessary to prepare a plurality of types of disposable type handpieces (for example, for each type of tool) and appropriately use them. Therefore, even though each handpiece is inexpensive, cost reduction cannot be achieved because a plurality of handpieces are used.

Further, the conventional disposable type synthetic resin dentistry handpiece is a conventional non-disposable type, specifically, a metal (metal) manufactured by precision machining or the like. Compared to the conventional handpiece, there is a problem in terms of function and performance due to low processing accuracy and the like, and it is still impossible to replace an expensive handpiece conventionally used in general. In other words, at present, conventional expensive metal dental handpieces are sterilized and used for each patient from the viewpoint of the safety of treatment and the like.

[0008]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of the prior art and provides a reusable type (recycling type) or a disposable type (disposable type).
Regardless of the type), the present invention provides a dental handpiece that is not inferior to the performance and function of a metal handpiece manufactured by conventional precision machining and has excellent cost merit (economical efficiency). .

[0009]

According to the present invention, a first aspect of the present invention is a head section (1) in which a rotating member having turbine blades is installed, and the head section (1) is connected to the head section (1). A cylindrical grip portion (2), a cylindrical joint portion (3) provided continuously with the grip portion (2), and the cylindrical grip portion (3) disposed in an internal space of the joint portion (3). A working medium conduit (4) for supplying a working medium to the dentist handpiece structured to removably engage with the joint part (3). Part (1), cylindrical grip part (2), and
The constituent member of the cylindrical joint portion (3) is formed of a material that can be integrally molded. (Ii) The cylindrical grip portion (2) is a split member including a pair of right and left half-split members; A shielding plate (5) provided between a pair of left and right half-split members; and (iii) the head portion (1), a tubular grip portion (2), and And a dental medical handpiece characterized in that the constituent members of the cylindrical joint part (3) are integrally joined to each other.

[0010] The second invention of the present invention relates to a method for manufacturing a dental medical handpiece according to the first invention, wherein: (i) the head part (1), a cylindrical grip part; (2), and
(Ii) forming at least the gripping portion (2) from a pair of left and right half-split members and a pair of left and right half-split members; Molded from a synthetic resin material so as to be constituted by a shielding plate disposed between the divided members, and (iii) each of the synthetic resin components is integrally joined to each other by joining means. And a method of manufacturing a dental handpiece.

Hereinafter, the technical structure and embodiments of the present invention will be described in detail with reference to the drawings. It goes without saying that the present invention is not limited to the illustrated one.

First, as described above, the dental handpiece of the present invention is manufactured especially from a synthetic resin (plastic). The trigger will be described here. The direct opportunity for the development of the synthetic resin dental medical handpiece according to the present invention is to improve the performance (enhancement and miniaturization) of the conventional expensive metal (metallic) dental air turbine handpiece. Therefore, the present inventors have developed a handpiece incorporating a new air supply / exhaust function. A small fluid-driven turbine handpiece incorporating the above-described new air supply / exhaust mechanism has been previously proposed by the present inventors (for example, US Patent Application License).
ion SN: 08 / 381,508). The small fluid-driven turbine handpiece previously proposed by the present inventors relates to a new structure for supplying and exhausting pressurized air to a rotating member of a head portion. More specifically, the small fluid-driven turbine handpiece proposed by the inventor of the present invention has one air supply port for supplying pressurized air to a rotating member disposed inside the head, and the one air supply port. It has a new air supply / exhaust system called an exhaust port arranged at a location very close to the vent. For example, the aforementioned air supply / exhaust system includes:
The above-mentioned one air supply port and a total of two air outlets disposed at extremely close positions above and below the air supply port. The new air supply / exhaust system proposed earlier by the present inventors has a simple structure at first glance, but is completely different from the prior art, thereby achieving surprisingly high performance. it can. This is because in the new air supply / exhaust system of the dental handpiece proposed earlier by the present inventors, the pressurized air flow supplied to the inside of the head chamber exhibits a completely different flow from the conventional one. That's why.

That is, in the above-mentioned small fluid-driven turbine handpiece proposed by the present inventors, the pressurized air flow supplied into the head chamber does not circulate in the chamber after collision with the turbine blade. (In a non-circulating state), the air is immediately exhausted from an exhaust port provided in the vicinity of the air supply port. On the other hand, in the conventional air supply / exhaust system, the pressurized air flow circulates (circulates) inside the chamber after colliding with the turbine blade, and is discharged from the exhaust port provided at the circulating (circular) end point. Is what is done. A completely unexpected result was obtained between the two air supply / exhaust systems (non-circulating system and circulating system), and specifically, the conventional system (circulating system) at the rotational speed of the tool.
Is 200,000 to 350,000 rpm, whereas the new system (non-diverting method) by the present inventors is 500,000 rpm.
The level is greatly improved and a large torque is realized. The details of the theoretical background regarding the difference between the performances of the two systems are explained in the above-mentioned proposal, but the conventional method (circulating method)
In, the main cause of performance degradation is that the pressurized air flow circulating in the chamber acts as a large resistor.

In the development process of the small fluid-driven turbine handpiece proposed by the inventors of the present invention, the idea of plasticizing the head portion was born. this is,
As described above, the pressurized air flow jetted into the head chamber is immediately (immediately) exhausted out of the system, so that a large load is not applied to the head chamber. A large load is not applied to the cap portion that covers the head portion, and therefore: the housing and the cap of the head portion can be easily and detachably formed; and • pressurized air is supplied into the chamber of the head portion. Since the air supply / exhaust port for air or exhaust can be arranged close to each other as described above, the air supply / exhaust system is used to form a working medium passage in the grip portion of the handpiece. The idea that the shielding plate can be configured by effectively using the shielding plate has been born, and the above-described point is the basis of the present invention.

The present invention has been developed in view of the above background, and is capable of integrally molding including a synthetic resin having excellent characteristics and functions capable of meeting the above-mentioned problems and various demands according to the present invention. Dental medical handpieces made of various materials are provided.

Hereinafter, embodiments of a dental handpiece of the present invention will be described in detail with reference to the drawings. It goes without saying that the present invention is not limited to the illustrated one.

FIGS. 1 to 8 are views for explaining a dental medical handpiece according to a first embodiment of the present invention. 1 to 3
As shown in the above, the dental handpiece (A) of the first embodiment of the present invention comprises the following main components. FIG. 1 is an overall perspective view, FIG. 2 is a cross-sectional view without the working medium conduit, and FIG. 3 is a plan view without the working medium conduit. That is, the dental handpiece (A) of the first embodiment of the present invention comprises (i) a head part (1) in which a rotating member (11) having a turbine blade (12) is housed, and (ii) the head. And (iii) a coupling part (3) connected to the gripping part (2), and (iv) a coupling part (3). A) a working medium conduit (4) for supplying various working media to a dentistry handpiece having a structure disposed in the internal space of (1) and detachably engaged and fixed to the joint portion (3); It is composed of

The basic internal structure of the dental handpiece (A) of the present invention is the same as a conventional general handpiece. In FIG. 1, the turbine blades (1
A working medium passage, such as pressurized air for rotating the 2) and pressurized water for cooling the treatment site, and a light guide for illuminating the affected area are shown. More specifically, in the dentistry handpiece (A) of FIG. 1, the working medium passages (pipes, ducts) include an air supply pipe (41) and an exhaust pipe (4).
2) and a water injection pipe (43), and has a straight (straight) light guide (6) in the grip part (2) for illuminating the affected part. In addition,
In FIG. 1, a power supply duct (also one of the working medium passages) for supplying power to the illuminating bulb (44) of the light guide (6) is omitted for clarity of illustration. In the present invention, even if the working medium passage is constituted by a cooling air pipe for cooling the treatment site, or an air pipe or the like that joins with the water injection pipe to enable spray-type water injection. The good thing is, of course.

As shown in FIG. 1, in the dental handpiece (A) of the present invention, the various working medium passages (pipes, ducts) are collectively referred to as working medium conduits (4). Further, in the dental medical handpiece (A) of the first embodiment of the present invention, the working medium conduit (4).
Adopts a structure which is attached to the inside of the joint part (3) from the rear end of the joint part (3) and is detachably locked. As will be described later, the working medium conduit (4) has a structure detachably engaged and fixed to the joint (3). When the working medium conduit (4) is engaged with the joint (3), the joint is engaged. In cooperation with the internal structure of the section (3), various functional media are communicated (connected) to the working medium conduits disposed corresponding to the inside of the grip section (2), and each functional medium is sent to the required site. It has the function of supplying or discharging. The illumination light is emitted from the light source (44) of the working medium conduit (4) to the light guide (6) disposed inside the grip portion (2).

In the present invention, the light guide (6)
Is made of a light-guiding material, and the one shown in the figure is made of a straight (straight) glass rod from the viewpoint of economy. As the light guide material, a glass fiber bundle, a plastic fiber bundle, a glass rod coated with a reflective film around a glass rod, or the like can be used. As shown in FIG. 1, a straight glass rod is used as the light guide (6),
In addition, a space is provided around the glass rod.
In this case, the refractive index of the glass rod and the refractive index of the space portion (air) are smaller, and the same structure as the total reflection type clad glass fiber is realized because the latter has a smaller refractive index. An extremely small optical transmission system can be obtained.

The first major feature of the dental handpiece (A) of the first embodiment of the present invention is that the head part (1), the grip part (2), and the joint part (3) are: Each of them is made of a material that can be integrally molded. That is, the dental handpiece (A) of the present invention.
Is composed of a plurality of divided members (elements) formed of an integrally moldable material, and these divided members are integrally joined to each other. As the material that can be integrally molded, a synthetic resin that can be injection-molded or an aluminum alloy that can be die-casted is used.

As the synthetic resin capable of being injection-molded, since this kind of dental medical handpiece is generally subjected to an autoclave sterilization treatment, heat resistance (for example, 135 ° C.,
(2.5 kgf / cm ² , 10 to 15 minutes) and excellent in chemical resistance, for example, polyetherimide (PE
I), polyethersulfone (PES), polyetherketone, polyimide and the like are used. These synthetic resins desirably have heat resistance having a glass transition point of 100 ° C. or higher, 217 ° C. for polyetherimide, 225 ° C. for polyether sulfone, and 1 ° C. for polyether ketone.
75 ° C, 250 ° C for polyimide, not deformed up to the temperature of these glass transition points, and injection molding is possible, so even if autoclave sterilization is repeated, it is durable. Can be used semi-permanently as in the case of the metal handpiece, and can be provided at low cost. Among them, since polyetherimide (PEI) does not generate microcracks even if autoclave sterilization is repeatedly performed, the above-mentioned heat-resistant and chemical-resistant synthetic resin which can be injection-molded is used. Is the most excellent one. Further, those obtained by blending an antibacterial agent with these synthetic resins are also preferable materials. For example, polyether sulfone (P
ES) 5 to 20 wt% of titanium oxide fine particles, and 0.5 to 1.0 wt.
% Is used. As the above-mentioned antibacterial agent, silver copper zeolite, silver zirconium phosphate, silver phosphate glass, silver phosphate ceramic, silver titania and the like are used in addition to the silver-deposited hydroxyapatite.

In the present invention, the above-mentioned joining between the divided members employs a desired joining means capable of obtaining a firm fixation such as adhesion or welding. For example, when the divided member is made of a synthetic resin, an ultrasonic welding method, a solvent welding method of dissolving and bonding with an organic solvent such as dichloromethane (methylene chloride), a heat welding method, a laser welding method, or the like can be employed. In the above-mentioned joining means, particularly in the ultrasonic welding method, in the case of this kind of small handpiece, not only the ultrasonic wave application direction but also a contact portion with another member in a direction perpendicular to the ultrasonic wave application direction is welded. This is an extremely useful joining means. This finding is not generally known,
It has been confirmed by the present inventors. In addition, it is preferable that the joining rib is integrally formed on the joining surface of the divided member during the ultrasonic welding.

FIGS. 4 to 8 are views for explaining the features of the dental medical handpiece (A) according to the first embodiment of the present invention. In the illustrated example, a constituent member of the handpiece (A) is a divided member (a) composed of a pair of left and right half-split members (a1, a2) in which the head part (1) and the grip part (2) are integrated.
It consists of. Other constituent members are shown in FIG. 10 (a) to FIG. 10 (c), which will be described later, with a shielding plate (5) provided as a partition plate between the pair of left and right half members (a1, a2). (3) integrally formed of a synthetic resin having a structure to be formed.

As shown in FIGS. 5 and 6, the divided member (a), which is a constituent member of the head portion (1) and the grip portion (2), that is, a pair of left and right half members (a1, a2) is provided. , Having a gutter shape having a substantially semicircular cross section. And
The joining surface (a) of the pair of left and right half-split members (a1, a2)
3, a4) is configured to be coplanar with a plane including the rotation axis (13) (see FIG. 13) of the rotation member (11) provided in the chamber space of the head portion (1). In the illustrated example, the joining surfaces (a3, a4) are formed by forming convex portions and concave portions (a5, a6) for convenience of positioning at the time of joining. In the illustrated example, a convex portion (a7) for forming a working medium passage is formed on the inner peripheral surface of the left half member (a2). In the present invention, a pair of left and right half-split members (a
It goes without saying that the joining surfaces (a3, a4) of (1, a2) may be joined with a shielding plate (5) interposed therebetween.

The protruding portion (a7) comes into contact with the left side surface of the shielding plate (5) as shown in FIG.
The inner space of 2) is divided into two sections. These partitioned spaces are used for an air supply passage (21) and a water supply passage (23) as working medium passages. Also, a right half member (a1)
The interior space of the light guide (6) and the exhaust passage (22)
Used for In the present invention, the uneven portions (a5 to a
7) may have a function as a rib for ultrasonic welding. That is, when ultrasonic welding is performed at the portions of the concave and convex portions (a5 to a7), the contact portions between the dividing member (a) and the shielding plate (5) are welded.

In the present invention, in order to stably hold and fix the light guide (6), it is preferable that the shielding plate (5) has a concave portion for holding the light guide (6). The details of the shielding plate (5) will be described later. In the present invention, as shown in FIG. 2, sealed end portions (24, 34) are formed on end surfaces of the grip portion (2) and the joint portion (3) that come into contact with each other. The sealed end (2
4, 34) are, as shown, conductive holes (241, 341) that communicate with the working medium passage, and light guide holding holes (240, 240) that hold the light guide (6) at the axial center position of the grip portion (2). 340).

In the dental handpiece (A) of the first embodiment of the present invention, the head part (1) has a divided structure comprising a pair of left and right half-split members together with the grip part (2) as described above. (See FIG. 4). The rotating member (11) is integrally incorporated in the head portion corresponding to the divided structure. As shown in FIG. 7, the head (1)
In the above, the rotating member (11) is disposed in a cylindrical chamber of the head portion (1), and is integrated with a rotating shaft (13) on which a variety of tools such as a cutting bar are detachably disposed at a tip portion. The turbine blade (12) provided in the main part is constituted as a main part. The rotating member (11) includes a rotating shaft (13).
It may be made of plastic except for. The bearing (14) that rotatably supports the rotating shaft (13) is a metal ball bearing type in the illustrated example, but an air bearing type that can rotate at a higher speed. May be adopted.

The schematic structure of the shielding plate (5) applied to the dental medical handpiece (A) of the first embodiment of the present invention is as follows.
This has been described with reference to FIGS. Here, the shielding plate (5)
8 will be described in detail with reference to FIGS. FIG.
The left side view of the shielding plate (5), that is, the left half member (a
FIG. 5 is a side view of a side (5a) facing 2) (see FIG. 4). FIG. 9 is a right side view of the shielding plate (5), that is, a side (5b) facing the right half member (a1) (see FIG. 4).
FIG. As shown in FIG. 4, which shows a plan view of the shielding plate (5), the distal end portion (head side) of the shielding plate (5).
The spherical portion (511) of (51) forms a part of the wall of the cylindrical chamber of the head (1).

The structure of the tip (51) of the shielding plate (5) is shown in FIGS. As shown in the figure, the distal end portion (51) of the shielding plate (5) has a single air supply port (52) and a total of the air supply ports (52) disposed in a vertically adjacent part of the air supply port (52). It has two exhaust ports (53, 54) and a water supply guide (55). Needless to say, the air supply port (52) communicates with the air supply passage (21), and the water supply guide (55) communicates with the water supply passage (23). Further, it goes without saying that the two exhaust ports (53, 54) communicate with the exhaust passage (22) as shown in FIG.

The air supply / exhaust system described above is a new structure air supply / exhaust system adopted in the small and high performance dental handpiece (US Patent Application SN: 08 / 381,508) proposed earlier by the present inventors. is there. That is, the characteristic point of the air supply / exhaust system is that the exhaust port is arranged close to the air supply port. In the case of the illustrated example, a total of two air outlets are provided at the upper and lower adjacent portions of one air supply port (52). Exhaust port (5
3, 54), which is completely different from the prior art. The supply / exhaust system can be realized very easily by employing the shielding plate (5) of the present invention.

FIG. 9 shows another major characteristic of the dental handpiece (A) of the first embodiment.
FIGS. 1 and 2 show a mode in which the light guide (6) is guided to the exit of the illumination light in a straight line. FIG.
Indicates that the shielding plate (5) has a light guide holding groove (56) for guiding the light guide (6) linearly. Then, in the light guide (6) holding mechanism by the light guide holding groove (56) of the shielding plate (5), the light guide (6)
Are arranged in the holding groove (56), and both ends thereof are fixed, but the outer peripheral surface other than the fixing portion is exposed to air (air to be exhausted). Such a holding mechanism of the light guide (6) has an important meaning as described below. In general, the light guide (6) applied to the lighting system is composed of various kinds. In the illustrated example, the light guide (6) is composed of one straight glass rod. In the holding mechanism of the light guide (6) in the illumination system of the present invention, the refractive index of the glass is larger than the refractive index of the surrounding air, so that the light transmission system of the light guide (6) is a glass fiber glass system. This is the same as that described above, so that the attenuation of illumination light can be prevented from decreasing. The clad type glass fiber system is intended to realize total reflection of transmitted light by making the refractive index of the central portion (core) and the outer peripheral portion (cladded) of the glass fiber different, thereby preventing attenuation of the transmitted light. It is. The holding mechanism of the light guide (6) also includes the shielding plate (5).
It can be easily realized by the above structure.

FIGS. 10A, 10B and 10C are views for explaining the structure of the joint (3) applied to the dental handpiece of the first embodiment of the present invention. The joint part (3) of the present invention is formed of, for example, an integrally molded product manufactured by injection molding a synthetic resin. And the said joint part (3)
(i) a sealed end portion (34) having a conduction hole (341) communicating with and connecting to the working medium passage disposed inside the grip portion (2);
(ii) Conduction for accommodating the distal end portion of the working medium conduit (4) (not shown) (a portion shown as 4A in FIG. 1 and constituting a joint on the working medium conduit side). A body portion (31) having a hole (32) and cooperating with the working medium conduit (4) in a manner to be described below to form a working medium conduit, and (iii) a working medium conduit (4) (FIG. (Not shown) and an engaging portion (33) that removably engages with the engaging portion.

The sealing end (34) of the joint (3) forms a joint with the sealing end (24) of the grip (2), and the working medium inside the grip (2). Three conducting holes [241 (2411-2) in the sealed end (24) leading to the air supply passage (21), the exhaust passage (22), and the water injection passage (23), which are passages.
413)], corresponding to the sealed end portion (34) of the joint portion (3).
Has three conductive holes [341 (3411 to 413)]. FIG.
1) As an air supply passage (321) and an exhaust passage (32)
2) and a hole communicating with the water injection passage (323) are shown. Also, a holding hole (340) for holding the light guide (6) is shown at the center of the sealed end (34). The above-mentioned conduction hole (341) is provided at the sealed end (34).
They are individually arranged at desired intervals in the circumferential direction. In the case of the illustrated example, the opening shape is a fan shape extending in the circumferential direction (see FIG. 10C). In the present invention, the shape and structure of the conduction hole (341) are not limited to those described above. Or a desired one such as one having a structure with a boss or the like. In FIG. 10, the sealed end (34)
A positioning projection (342) for guiding a joint portion of the grip portion (2) with the sealed end (24) is shown on the front surface of the grip portion (2).

The conducting hole (32) formed inside the main body (31) of the joint part (3) has an open end and is a tip of the working medium conduit (4), that is, the working medium conduit. The side joint part (4A) (see FIG. 1) is mounted and accommodated.
In the conduction hole portion (32), three holes configured to gradually increase in diameter from the sealing end portion (34) toward the engagement portion (33) are respectively provided with sealing end portions ( 34), and communicates with each of the working medium passages (41, 42, 43) of the working medium conduit (4).

The engaging portion (33) of the coupling portion (3) which engages with the working medium conduit (4) is constituted by having an engaging annular groove (331) in the illustrated example. The engagement annular groove (331) constitutes a detachable connection portion with the working medium conduit (4). In the illustrated example, the engagement annular groove (331) is provided on an outer peripheral portion of the engagement portion (33). The engaging portion (spring steel + engaging steel ball) of the working medium conduit side joint (4A) (see FIG. 1) engages removably. Due to the configuration of the connection part, the joint part (3) and the working medium conduit (4) are relatively rotatable. In the present invention, the structure of the connecting portion is not limited to the one described above, and may be another structure known in the art, and the specific structure of the engaging portion (33) correspondingly. Is also changed.

In the present invention, the joint portion (3), for example, the joint portion (3) made of synthetic resin is manufactured by integral molding by an injection molding method. More specifically, the joint part (3) made of the synthetic resin is provided in the mold with a conductive hole (32) that can communicate with each of the working medium passages (41, 42, 43) of the working medium conduit (4). That is, a separate stand may be inserted into a portion (see FIG. 10) corresponding to the air supply, exhaust, and water supply passages (321 to 323) to perform integral molding. In the present invention, it is needless to say that the joint portion (3) is not limited to the above-described integrally molded product, and may be composed of a desired number of divided members such as a divided member having a half-split structure. This point is not only the joint part (3), but also other head parts (1) and grip parts (2).
It is also true for

In the present invention, the sealing end (34) of the joint (3) and the sealing end (24) of the gripper (2) are joined by a desired fixing means. For example, bonding,
They are integrally joined by welding or welding. In the illustrated first embodiment, they are integrally joined by an ultrasonic welding method. In addition, a positioning concave portion (or a convex portion) (242, 342) for bonding is formed at a joint portion between the two members. In the illustrated example, the positioning convex part (342) is provided on the joint part (3) side and the positioning concave part (242) is provided on the grip part (2) side. The good thing is, of course. In the present invention, the positioning position of the positioning concave and convex portions (242, 342) is, for example, in the case where two positioning portions are disposed at the joint portion, a position of 180 °, that is, if they are not disposed on the same diameter line, The medium passage can be aligned and joined between the two members.

FIG. 11 is a view for explaining a dental medical handpiece (A) according to a second embodiment of the present invention. The features of the dental care handpiece (A) of the second embodiment are as follows. (i) The entire head portion (1) is integrated with the left half member (a2) of the grip portion (2). Then, the member is integrally joined to the right half member (a1) to obtain a final product, that is, a dental medical handpiece (A). (ii) In response to the fact that the entire head (1) is integrated, the rotating member (1) mounted in the head chamber
1) is a unitized cartridge type,
It is detachably attached to the head part (1). (iii) The cap (15) of the head (1) is configured to be removable when the rotating member (11) is attached or detached. In addition, the cap (15) is configured to function as a fixing member for the rotating member (11) when mounted. Other structures and operations other than those described above are the same as those in the first embodiment.

FIG. 12 is a view for explaining a dental medical headpiece (A) according to a third embodiment of the present invention. In the dental handpiece (A) of the third embodiment, the head (1), the grip (2), and the joint (3) are constituted by a pair of left and right half-members (a1, a2). It is characterized by the following points. Other structures and operations other than those described above are the same as those in the first embodiment.

FIG. 13 is a view for explaining a dental medical handpiece (A) according to a fourth embodiment of the present invention. In the dental handpiece (A) of the fourth embodiment, (i) the two parts of the grip part (2) and the joint part (3) are composed of a pair of left and right half-split members (a1, a2). (Ii) The whole head portion (1) is integrated with one of the half members (a2). Other structures and operations other than those described above are the same as those in the first embodiment.

FIGS. 14 and 15 illustrate a dental handpiece (A) according to a fifth embodiment of the present invention.
A feature of the dental care handpiece (A) of the fifth embodiment is that the operability of this kind of handpiece is improved, and in particular, the appearance and shape of the handpiece are improved in order to accurately operate the handpiece with respect to the treatment target. It was done. That is, the outer shape of the grip portion (2) is an upper surface portion (2a) that is a horizontal surface, and left and right slopes (2b, 2b,
2b), left and right side surfaces (2c to 2d) of a ship-like curved surface connected to each of the left and right slopes (2b, 2b), and a bottom (2e). The bottom surface of the ship is indicated by a solid line (2d) or dotted line (2d ').
It may be. A grip part (2) based on the external structure
And the handpiece can be operated accurately using each surface as a guide (for example, using the inclination angle of each surface with respect to the horizontal direction).

[0043]

In the dental handpiece of the present invention, the head, the grip, and the joint, which are the main components, are integrally molded by injection molding of a material that can be integrally molded, for example, synthetic resin. In addition to being configured based on a plurality of divided members, the divided members are integrally joined to each other by welding or the like. In particular, by using a synthetic resin as a material that can be integrally molded, the divided member can be given the same accuracy as that obtained by conventional precision machining. As a result, the precision of each component can be maintained, and its processing and assembly is much easier than conventional metal handpieces manufactured by precision machining. It does not take much time, and the manufacturing cost and the product cost can be significantly reduced. The above points are important in light of the strong demand for high-performance and inexpensive disposable type handpieces reflecting recent viral infections, AIDS problems, etc. .

The above-described highly functional handpiece is realized by adopting a new air supply / exhaust system, working medium supply system, and illumination optical system applied to the dental handpiece of the present invention. The system is easily manufactured from a one-piece molding material, such as a synthetic resin, and is optimized by employing a shield disposed within the body of the handpiece (bed body comprising a head, a grip and a joint). .

In the dental handpiece of the present invention, the structure of the joint portion is adapted to the structure of the unitized product of the working medium conduit in view of the recent unitization of the working medium conduit. It is. And such a structure of the joint part was developed based on the knowledge that it can be realized by integral molding of a material that can be integrally molded. For this reason, the dental handpiece of the present invention
It is versatile because it can be connected to the unitized product of the existing working medium conduit and can be made compatible with existing handpieces.

In addition, in the present invention, by using a synthetic resin as a material that can be integrally molded, a light-weight dentistry handpiece can be realized, thereby facilitating operation by a user such as a dentist. . Further, when each of the divided members is made of a synthetic resin, an ultrasonic welding method can be employed as a means for joining the divided members, so that completely integrated joining can be performed regardless of the type of the synthetic resin. In particular, even if the synthetic resin material is a high-functional material called high engineering plastic, it can be securely joined by the ultrasonic welding method, and thus the present invention provides a high value-added dental handpiece.

[Brief description of the drawings]

FIG. 1 is a sectional view of a dental medical handpiece according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a main part (excluding a working medium conduit part) of the dental care handpiece according to the first embodiment of the present invention.

FIG. 3 is a plan view of a main part (excluding a working medium conduit part) of the dental care handpiece according to the first embodiment of the present invention.

FIG. 4 is a plan view of a divided member constituting the dental care handpiece according to the first embodiment of the present invention.

FIG. 5 is a sectional view taken along line AA of FIG. 3;

FIG. 6 is a sectional view taken along line BB of FIG. 3;

FIG. 7 is a sectional view of a head portion of the dental care handpiece according to the first embodiment of the present invention.

FIG. 8 is a left side view of a shielding plate applied to the dental handpiece of the first embodiment of the present invention.

FIG. 9 is a right side view of a shielding plate applied to the dental handpiece of the first embodiment of the present invention.

FIG. 10 is a diagram illustrating a structure of a joint portion applied to the dental care handpiece according to the first embodiment of the present invention.

FIG. 11 is a plan view of a divided member constituting a dental medical handpiece according to a second embodiment of the present invention.

FIG. 12 is a plan view of a divided member constituting a dental care handpiece according to a third embodiment of the present invention.

FIG. 13 is a plan view of a divided member constituting a dental care handpiece according to a fourth embodiment of the present invention.

FIG. 14 is a perspective view illustrating the appearance of a dental handpiece according to a fifth embodiment of the present invention.

FIG. 15 is a sectional view taken along line II of FIG. 14;

[Explanation of symbols]

 A: Dental medical handpiece a: Splitting member a1: Right half-split member a2: Left half-split member a3, a4: Joining surface a5: Positioning protrusion a6 ... Positioning recess a7 Projecting part 1 Head part 11 Rotating member 12 Turbine blade 13 Rotating shaft 14 Bearing 15 Cap 2 Capping part 21 …… Air supply passage 22 …… Exhaust passage 23 …… Water supply passage 24… (Grip side) Sealed end 240… (Light guide) holding hole 241 …… Conducting hole 2411 …… Air supply hole 2412… Exhaust hole 2413… Water injection hole 242… Positioning concave part 3… Joint part 31… Body part 32… Conducting hole part 321… Air supply passage 322… … Exhaust passage 323 Water supply passage 33 Engagement part 331 Engagement annular groove 34 Sealed end 340 (Grip side) Holding hole (Light guide) Holding hole 341 Conducting hole 3411 … Air supply hole 3412… Exhaust hole 3413… Water injection hole 342… Positioning convex part 4… Working medium conduit 4A …… Working medium conduit side joint 41 41… Air supply passage (pipe) , Duct) 42 exhaust passage (pipe, duct) 43 water supply passage (pipe, duct) 44 light source 5 shielding plate 51 tip 511 spherical surface 52 …… Air supply port 53, 54 …… Exhaust port 55 …… Water supply guide section 56 …… Light guide holding groove 6 …… Light guide

Continuation of the front page (72) Fumiki Satoji, Inventor 6200-256, Kawashima-cho, Yokkaichi, Mie (72) Inventor, Shigeo Kobayashi 43-2, Odaida, Kuwana-shi, Mie (56) References JP-A-6-327699 (JP, A) JP-A-6-90964 (JP, A) JP-A-6-296623 (JP, A) JP-A-6-105853 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) A61C 1/00-1/08 A61C 3/00-3/02

Claims (25)

(57) [Claims] 1. A head part (1) in which a rotating member having turbine blades is housed, a cylindrical grip part (2) connected to the head part (1), and a continuous part provided to the grip part (2). Cylindrical joint part (3) to be formed, and a dental medical handpiece having a structure arranged in the internal space of the joint part (3) and detachably engaged with the joint part (3). A working medium conduit (4) for supplying a working medium, comprising: (i) said head part (1), a cylindrical gripping part (2), and
The constituent member of the cylindrical joint portion (3) is formed of a material that can be integrally molded. (Ii) The cylindrical grip portion (2) is a split member including a pair of right and left half-split members; A shielding plate (5) provided between a pair of left and right half-split members; and (iii) the head portion (1), a tubular grip portion (2), and The dental medical handpiece, wherein the constituent members of the cylindrical joint part (3) are integrally joined to each other. 2. At least two parts of a head part (1), a grip part (2), and a joint part (3) are divided members composed of a pair of right and left half-split members integrally formed of an integrally moldable material. The dental handpiece according to claim 1, wherein the handpiece is configured and the divided members are integrally joined to each other. 3. Dental care according to claim 1, wherein the space defined by the shielding plate (5) in the grip part (2) is a passage for the working medium supplied from the working medium conduit (4). Handpiece. 4. Dental medical handpiece according to claim 1, wherein the shielding plate (5) has a light guide holding groove (56) for holding the light guide (6) on one side. 5. The dental device according to claim 1, wherein a joining surface of the pair of right and left half members is coplanar with a plane including a rotation axis of a rotating member housed in the head portion (1). Medical handpiece. 6. A head part (1) and a grip part (2) are constituted by a divided member composed of a pair of right and left half-split members integrally formed, and the left and right parts of a part corresponding to the grip part (2) are formed. The dental handpiece according to claim 1 or 2, further comprising a shielding plate between the pair of half-split members, wherein a joining surface of the pair of left and right half-split members is integrally joined. 7. The dental medical device according to claim 6, wherein a joining surface of the pair of right and left half members is coplanar with a plane including a rotation axis of a rotating member housed in the head portion (1). Handpiece. 8. The grip portion (2) is constituted by a pair of left and right half-split members, and one of the pair of left and right half-split members is constituted by a split member having a head portion (1) integrally formed. The dental handpiece according to claim 1, further comprising a shielding plate between the pair of left and right halves, and a joining surface of the pair of left and right halves being integrally joined. 9. The dental medical device according to claim 8, wherein a joining surface of the pair of right and left half-split members is flush with a plane including a rotation axis of a rotating member housed in the head portion (1). Handpiece. 10. The head part (1), the grip part (2), and the joint part (3) are constituted by a divided member composed of a pair of left and right half-piece members integrally formed, and the pair of left and right halves is formed. The dental medical handpiece according to claim 2, wherein the joining surfaces of the split members are integrally joined. 11. The dental medical device according to claim 10, wherein a joining surface of the pair of right and left half members is coplanar with a plane including a rotation axis of a rotating member housed in the head portion (1). Handpiece. 12. A pair of left and right halves of a portion corresponding to the grip portion (2) are constituted by: (i) a gutter shape having a substantially semicircular cross section; One of the half-split members is formed by extending a protruding portion on the circumferential surface in the longitudinal direction, and (iii) when the left and right half-split members and the shielding plate are joined to each other, The dental handpiece according to any one of claims 1 to 2, wherein the shape portion contacts one side of the shielding plate. 13. When the pair of left and right half-split members are integrally joined, upper and lower portions separated by the protruding portion on the side having the protruding portion form an air supply passage and a water supply passage, and are protruded. The dental handpiece according to claim 12, wherein the side having no portion constitutes an exhaust passage. 14. The dental handpiece according to claim 12, wherein the joining surfaces of the pair of left and right half-split members have positioning concave portions and convex portions for mutual joining. 15. A gripping portion (2) and a joint portion (3) each having a sealing end portion (24, 34) at each end face joint portion, and said sealing end portions (24, 34). 3. The dental device according to claim 1, further comprising a light guide holding portion for holding the light guide at an axial position of the grip portion, and an opening communicating with the working medium passage. Medical handpiece. 16. The dental care handpiece according to claim 15, wherein the end face joint has a positioning concave part and a convex part for mutual joining, respectively. 17. A plurality of positioning concave portions and convex portions are formed so as not to be linearly arranged in a direction perpendicular to the axis of the grip portion (2) and the joint portion (3). A dental medical handpiece according to item 1. 18. The coupling (3) comprises a working medium conduit (4).
(33) engaging with the end of the working medium conduit (4)
A main body portion (31) having a conducting hole portion (32) communicating with the working medium passage, and a sealed end portion joined to the grip portion (2), the conducting hole (32) communicating with the conducting hole portion (32). 34
3. The dental handpiece according to claim 1, comprising a sealed end (34) having 1). 19. The conduction hole (32) is formed in a coaxial shape that gradually increases in diameter as viewed from the sealed end (34) of the joint (3) toward the engagement part (33). 19. Dental handpiece according to claim 18, having three consecutive holes, wherein the three holes communicate with a conduction hole (341) in the sealing end (34). 20. An outer structure of the grip portion (2) includes a horizontal upper surface portion, a left and right slope extending from the upper surface portion, a left and right side surface portion of a ship-like curved surface continuous with each of the left and right slopes, and 2. A structure comprising a bottom portion.
3. The dental handpiece according to item 2. 21. The integrally moldable material is an injection-moldable synthetic resin having a glass transition point of 100 ° C. or higher.
3. The dental handpiece according to item 2. 22. The dental handpiece according to claim 1, wherein the integrally formable material is an aluminum alloy that can be formed by die casting. 23. A head part (1) in which a rotating member provided with turbine blades is housed, a cylindrical grip part (2) connected to the head part (1), and a continuous connection to the grip part (2). Cylindrical joint part (3) to be formed, and a dental medical handpiece having a structure arranged in the internal space of the joint part (3) and detachably engaged with the joint part (3). A working medium conduit (4) for supplying a working medium, comprising: (i) said head part (1), a cylindrical grip part (2), and
(Ii) forming at least the gripping portion (2) from a pair of left and right half-split members and a pair of left and right half-split members; Molded from a synthetic resin material so as to be constituted by a shielding plate disposed between the divided members, and (iii) each of the synthetic resin components is integrally joined to each other by joining means. A method for manufacturing a dental handpiece, comprising: 24. The dental care handpiece according to claim 23, wherein the joining means is one or a combination of two or more selected from ultrasonic welding, heat welding, laser welding, and solvent welding. Production method. 25. The joining surface of each component member has joining ribs formed by integral molding.
4. The method for producing a dental handpiece according to item 3.