WO1994008531A1

WO1994008531A1 - Diposable dental hand drill or bur assembly

Info

Publication number: WO1994008531A1
Application number: PCT/DE1992/000897
Authority: WO
Inventors: Hans-Ulrich Melchior; Michael Witcher; Novotny Milo; Speigel Howard
Original assignee: Melchior Hans Ulrich; Michael Witcher; Novotny Milo; Speigel Howard
Priority date: 1992-10-10
Filing date: 1992-10-28
Publication date: 1994-04-28
Also published as: DE4234287A1

Abstract

A dental hand drill or bur assembly with a connector (1) for connection to a prior art compressed air and water union, a cylindrical grip (2) with at least one compressed air and one water pipe and a drilling head (4) with a turbine (3) to drive an insertable drilling or burring tool, in which the turbine (3) can be driven by the compressed air fed in via the connector and taken into the drilling head (4) via the compressed air pipe, is constructed in such a way that the housing consisting of the connector air pipe, is constructed in such a way that the housing consisting of the connector (1), the grip (2) and the drilling head (4) is made of plastic so that it is a single-use or disposable item.

Description

DENTAL HAND DRILL OR MILLING UNIT FOR UNIQUE USE

The invention relates to a dental hand drill or milling cutter with a connection part for connecting a conventional compressed air and water coupling, e. .. .. nem at least one cylindrical handle part having a compressed air line and a water line and a drilling head having a turbine for driving an insertable drilling or milling tool, the turbine being drivable by the compressed air introduced via the connection piece and guided through the compressed air line into the drilling head.

Dental hand drills or dental hand milling cutters of the type in question have been known from practice for decades. These are so-called high-speed hand drills, in which the drilling or milling tool is driven by a rotor that is pressurized with compressed air. The water, which is also fed into the drill head in addition to the compressed air, serves to cool the drilling tool on the one hand and the drilling point on the other hand, i.e. of the tooth to be machined.

Dental hand drills of the type in question are extremely problematic, in particular with regard to diseases which can be transmitted by saliva and / or blood, since they have ideal niches for the nesting of bacteria and viruses, in particular in the area of the drill head. Consequently, the dental hand drills must be disinfected or sterilized extremely carefully after treatment of a patient. Consequently, the known hand drills must all be made of a material that is accessible to conventional sterilization measures, for example steam sterilization. Correspondingly, the known dental hand drills are usually equipped with complex metallic housings and accordingly have components or functional parts that are resistant to steam or to high temperatures. Such a Structural design of a dental hand drill, however, entails extremely high manufacturing costs. In addition, the conventional dental hand drills do not guarantee that the disinfection or even sterilization that took place before the treatment is actually carried out effectively.

For the patient to be treated, the conventional dental hand drill presents a further - psychological - problem, since the patient to be treated cannot see from the available dental hand drill whether he is actually disinfected or sterilized. As a result, enormous fear of contact with the patient arises, which increases the fear of dental treatment, which is always present anyway.

The invention is therefore based on the object of designing and developing a dental hand drill of the type mentioned at the outset in such a way that it is inexpensive to manufacture with the simplest construction and at the same time fully satisfies the requirements of a high-speed dental hand drill. The extremely inexpensive to produce dental hand drill should be usable in the sense of a disposable or disposable item.

The dental hand drill according to the invention is characterized by the features of claim 1. Thereafter, the dental hand drill or milling cutter in question is designed in such a way that the housing consisting of the connecting part, the handle part and the drilling head is at least largely made of plastic in the sense of a disposable or disposable article.

According to the invention, it has accordingly been recognized that the problem of an always germ-free or bacteria-free dental hand drill, in contrast to previous practice, can be solved by disposing of the dental hand drill as a disposable or disposable item. leads. For this purpose, it is necessary in accordance with the invention to manufacture the essential components of the dental hand drill - as far as possible - from inexpensive, if not even cheap, material. Accordingly, the housing consisting of the connection piece, the handle part and the drill head is at least predominantly made of plastic and can be thrown away after use, ie after treatment of a single patient. Sterilizing or disinfecting the dental hand drill is therefore no longer necessary. Correspondingly, at least the motion-free parts of the dental hand drill, namely in particular the housing or the housing parts, can be made from a less resistant material. The dental hand drill according to the invention in question could, for example, be welded into transparent plastic film and removed from the sealed packaging shortly before the treatment — in front of the patient to be treated. Thus, the patient actually has the certainty that he is being treated with a completely germ-free or bacteria-free dental hand drill and is not subject to the risk of infection from residues from other patients.

With regard to a particularly simple constructive configuration of the dental hand drill, it is particularly advantageous if the housing or if the housing parts are or are manufactured by injection molding. In this way, the housing parts - each individually - like the plastic parts of a ballpoint pen, are manufactured and then assembled. It would also be conceivable in the context of a further advantageous embodiment if the housing - if it is made entirely of plastic - is made in one piece, it only being necessary to ensure that the functional parts of the dental hand drill, for example the turbine and the connecting part, are sufficiently accessible . The one-piece design of the housing would have the enormous advantage of a single injection mold. In the event of a relatively complicated "inner life" of the invention According to the dental hand drill, the housing could be made in two parts with an approximately half parting line, the two parts of the housing being glued, welded or otherwise sealed together after the functional elements have been introduced.

With regard to the design of the connection part, it is particularly advantageous if it has a special connection for a corresponding compressed air and water coupling. Either a bayonet connection or a screw connection, preferably in the form of an external thread, could be provided. In any case, it must be ensured that neither compressed air nor water leaks occur in the area of the connecting part or the coupling to be flanged there. To particularly effectively prevent such leaks, a special ring seal, which can be fitted from the outside or put over this area, could be provided in the area of the connecting part or in the area of the transition between the connecting part and coupling, which at the same time unintentionally loosening the compressed air and water coupling effectively prevented.

The connecting part could furthermore have two connecting pins projecting from the housing, one connecting pin for the compressed air and another connecting pin for the water supply. These connection pins would then protrude into corresponding areas of the coupling. In the context of a particularly simple embodiment of the dental hand drill according to the invention, the connection pins could be integral components of the connection part and thus of the housing. If you want to secure the connection pins against breaking, the connection pins could be made of metal. Accordingly, these would have to be poured, fitted or glued into the connecting part. In any case, an adhesive connection favors the seal between the connection pins and the rest of the housing. The compressed air and water lines running from the connection pins to the drill head could be formed in the cylindrical handle part in the sense of plastic hoses. However, this required additional components of the dental hand drill. Likewise, the compressed air and water lines could, in a very particularly advantageous manner, be integral components of the handle part and thus of the housing. Additional components would then no longer be required. In any case, it is essential that the compressed air line opens into the drill head in the direction of the turbine so that the air escaping there can drive the turbine in rotation. From an aerodynamic point of view, the opening for the discharge of the compressed air is preferably elliptical.

Furthermore, it is particularly advantageous if the water line also extends into the drill head and, in the immediate area of the drill tool to be explained later, has an outlet opening or outlet nozzle directed towards the processing point. The water to be passed through the drill head serves on the one hand to cool the drill head itself and on the other hand to cool the drilling site, i.e. of the tooth to be treated.

With regard to an advantageous handling of the drill head with the simplest construction, it is a further advantage if the drill head is angled to the longitudinal axis of the handle part. In a very particularly advantageous manner, the boring head is angled by 30 °, with this fixed predefined angle allowing optimum handling in the tooth area.

With individual housing parts as well as with a one-part housing, it is of particular advantage if the head part is preferably in the area of the receptacle for the drilling tool is evident or closable by means of a lid. This cover is used at least in the course of assembly for inserting the turbine and other components relating to the turbine. The cover is preferably designed and dimensioned such that it has a passage in the middle approximately for receiving the drilling tool. The lid does not have to be watertight or airtight, especially since the air outlet for driving the turbine is in front of the lid when viewed in the direction of flow. Rather, air outlets are imperative so that the compressed air driving the turbine can escape unhindered from the drill head. This is preferably done in a direction opposite to the drilling tool.

Even with the simplest structural design, the aforementioned turbine is always rotatably mounted on an axis with bilateral bearings within the drill head. So that the turbine can withstand a load of up to 400,000 revolutions per minute, it is advantageous if the axis is made of metal. An abrasion-resistant, connection-stiff ceramic could also be considered here.

The same applies to the bearings arranged on both sides, which are also made of metal in the context of a preferred embodiment. Here, too, an abrasion-resistant ceramic could be used, which should only be designed so that it extends the duration of a treatment, i.e. up to about 5 hours, which can withstand enormous loads at high speeds. In order to avoid vibrations and for quasi self-lubrication, the bearings can be plastic-coated in a further advantageous manner. Here, for example, Teflon is particularly suitable.

Finally, with a view to receiving the drilling tool, it is particularly advantageous if the axis carrying the turbine is hollow at least at one end that it can have a receptacle for inserting the drilling tool there. The axis itself would then be designed to be a receptacle, which in turn considerably reduces the manufacturing costs.

There are various possibilities for advantageously designing and developing the teaching of the present invention. For this purpose, reference should be made on the one hand to the claims subordinate to patent claim 1, and on the other hand to the following explanation of an exemplary embodiment of the invention with reference to the drawing. In connection with the explanation of the preferred exemplary embodiment of the invention with reference to the drawing, generally preferred configurations and developments of the teaching are also explained. In the drawing shows

1 in an overall view, schematically, an exemplary embodiment of a dental hand drill or dental hand milling cutter according to the invention,

Fig. 2 in an enlarged view the head part of the dental hand drill shown in Fig. 1 and

Fig. 3 is a further enlarged view of the turbine of the head part shown in Fig. 2.

The figures together show a dental hand drill with a connection part 1 for connecting a conventional compressed air and water coupling, not shown in the figures, a cylindrical handle part 2, which has a compressed air and water line, also not shown in the figures, and a turbine 3 Drilling head 4 for driving an insertable drilling or milling tool that is also not shown in the figures. The turbine 3 is connected to the Part 1 introduced and driven through the compressed air line into the Bohr¬ head 4 driven.

In the manner according to the invention, the housing consisting of the connection part 1, the handle part 2 and the drill head 4 is made of plastic in the sense of a disposable or disposable article. The respective housing parts 1, 2 and 4 are manufactured by injection molding within the scope of the exemplary embodiment selected here. The housing can also be made in one piece.

Fig. 1 clearly shows that the connection part 1 has a screw connection in the form of an external thread 5 for a corresponding compressed air and water coupling. Furthermore, the connecting part 1 has two connecting pins 6 projecting from the housing, which serve to introduce compressed air on the one hand and water on the other. In the context of the embodiment chosen here, the connection pins 6 are made of metal and cast into the connection part 1. Likewise, the connection pins 6 can also be designed as integral components of the connection part 1.

With regard to the configuration of the compressed air and water lines running in the cylindrical handle part 2, for the sake of simplicity, reference is made here to the general part of the description, since the features relating to the compressed air and water lines cannot be seen from the figures .

In Fig. 1 is further indicated that the drill head 4 is angled to the longitudinal axis of the handle part 2. The angle of the drill head 4 selected here is approximately 30 °.

1 and 2 show together that the drilling head 4 in the area of the receptacle 7 the drilling tool, not shown in the figures, by means of a cover 8 for insertion or removal. would take the turbine 3 shown in Fig. 3 is evident. The turbine 3 shown in an isolated manner in FIG. 3 is rotatably supported on an axis, also not shown in the figures, with bearings on both sides, with both the axis and the bearings on both sides being made of metal in the embodiment chosen here. The bearings are also plastic coated. The axle is hollow at one end, namely on the side facing the receptacle 7, and there has a receptacle for inserting the drilling tool, so that the drilling tool passes through the receptacle 7 formed in the cover 8 into the corresponding receptacle of the axle is insertable.

Finally, it should be emphasized that the exemplary embodiment discussed above only serves to discuss the claimed teaching, but does not restrict it to the exemplary embodiment.

Claims

1. Dental hand drill or milling cutter, with a connecting part (1) for connecting a conventional compressed air and water coupling, a cylindrical handle part (2) having at least one compressed air line and a water line, and a drilling head (3) with a turbine (3) 4) for driving an insertable drilling or milling tool, the turbine (3) being drivable by the compressed air introduced via the connecting part (1) and guided through the compressed air line into the drilling head (4), characterized in that this comes from the connecting part (1), the handle part (2) and the drill head (4) existing housing in the sense of a disposable or disposable item is at least largely made of plastic.

2. Dental hand drill according to claim 1, characterized in that the housing (1, 2, 4) or the housing parts (1, 2, 4) is or are made by injection molding.

3. Dental hand drill according to claim 1 or 2, wherein the housing (1, 2, 4) is made entirely of plastic, characterized in that the housing (1, 2, 4) is made in one piece.

4. Dental hand drill according to one of claims 1 to 3, characterized in that the connecting part (1) has a preferably pressurized bayonet connection for a corresponding compressed air and water coupling.

5. Dental hand drill according to one of claims 1 to 3, characterized in that the connecting part (1) has a screw connection, preferably in the form of an external thread (5), for a corresponding compressed air and water coupling.

6. Dental hand drill according to one of claims 1 to 5, characterized in that the connection part (1) has at least two projecting connection pins (6) from the housing.

7. Dental hand drill according to claim 6, characterized in that the connecting pins (6) are integral parts of the connecting part (1) and thus the housing.

8. Dental hand drill according to claim 6, characterized in that the connecting pins (6) are made of metal.

9. Dental hand drill according to claim 8, characterized in that the connecting pins (6) in the connecting part (1) are poured or glued.

10. Dental hand drill according to one of claims 1 to 9, characterized in that the compressed air and water lines in the cylindrical handle part (2) are made in the sense of hoses made of plastic.

11. Dental hand drill according to one of claims 1 to 9, characterized in that the compressed air and water lines are integral components of the handle part (2).

12. Dental hand drill according to one of claims 1 to 11, characterized by the fact that the compressed air line opens via an elliptical opening into the drill head (4) in the direction of the turbine (3).

13. Dental hand drill according to one of claims 1 to 12, da¬ characterized in that the drill head (4) is angled to the longitudinal axis of the handle part (2).

14. Dental hand drill according to claim 13, characterized in that the drill head (4) to the longitudinal axis of the handle part (2) is angled and that the angle is preferably in the range between 30 ° and 45 °.

15. Dental hand drill according to one of claims 1 to 14, characterized in that the drill head (4) preferably in the region of the receptacle (7) for the drilling tool by means of a cover (8) for inserting or removing the turbine ( 3) can be opened.

16. Dental hand drill according to one of claims 1 to 15, da¬ characterized in that the turbine (3) is rotatably mounted on an axis with bearings on both sides.

17. Dental hand drill according to claim 16, characterized in that the axis is made of metal.

18. Dental hand drill according to claim 16 or 17, characterized gekenn¬ characterized in that the bearings are made of metal.

19. Dental hand drill according to claim 16 or 17, characterized gekenn¬ characterized in that the bearings are made of ceramic.

20. Dental hand drill according to claim 18 or 19, characterized gekenn¬ characterized in that the bearings are plastic-coated.

21. Dental hand drill according to one of claims 16 to 20, characterized in that the axis is hollow at least at one end and there has a receptacle (7) for inserting the drilling tool.