Appliance for implant work on the jaw/dentine or other part of the body.

The present invention relates to an apparatus for reducing the number of different required lengths of processing tools in the form of drills, grinding instruments, etc. for implantation work on the jaw / dentin or other parts of the body. Each processing instrument is designed with a part for attachment to a rotation unit (tool) with which each processing instrument can be rotated. The device consists of an extension unit, which is formed or connected at its first end to a fastening part which corresponds to the fastening part on each processing instrument, and via which the extension unit can be inserted into the rotation unit and rotated by it. The extension unit is also formed with a receptacle for each machining instrument, which extends from its other end and can be inserted with its fastening part into the receptacle for establishing a rotationally fixed cooperation between the fastening part and the extension unit via a surface on the fastening part and an active surface in the extension unit , The extension unit is preferably formed with a cutout provided between the first and the second end, via which the insertion position of each processing instrument in the extension unit can be indicated in the longitudinal direction and via which each processing instrument inserted into the unit is accessible for its separation from the extension unit.

Because of different drilling or processing depths and variable accessibility during implantation work, there is a need for equipment which allows a considerable range of fluctuation in the lengths of the processing instruments / drills. For this reason, sets with a large number of machining instruments / drills have been made available, of which instruments / drills of suitable length have been selected as work progresses. A large number of processing instruments make work difficult and, moreover, are expensive to obtain.

The present invention takes advantage of the knowledge that the number of required lengths of processing instruments can be reduced by one or more extension units between the rotary unit and each processing instrument. Extension units of this type are previously known, see GB-A-2 058 615. However, an extension unit is desired which is easier for the dentist to handle.

The invention proposes an extension unit for processing instruments. The extension unit itself will be available in several lengths as required. In a rotary unit, the extension unit will be easy to set up and can accommodate and hold processing instruments of different types and lengths, at least in a rotationally fixed manner. From the point of view of handling, the operation will be simple and clear, so that the extension unit can be reliably anchored in the rotation unit and any processing instrument in the extension unit at any time. The extension unit must have a smooth structure that has no adverse effect on the work to be performed.

In addition, their manufacture will be technically simple and economically attractive.

The present invention proposes an apparatus which achieves the above-mentioned objects.

The active surface of the extension unit also forms a self-locking wedge surface with which each processing instrument can be fixed in its longitudinal insertion direction. When viewed in the longitudinal and transverse directions of the extension unit, the active surface is preferably straight. It can interact with a similarly straight counter surface of the fastening part of each processing instrument. Furthermore, the active surface is inclined in the direction of insertion and widens towards the other end of the extension unit at a small angle, which can be selected in the range from 20 to 60. The angle is preferably up to about 40. The counter surface of the fastening part of each processing instrument runs essentially parallel to the longitudinal axis of the processing instrument. By using this part, which is preferably reinforced relative to the other parts of the extension unit, an opening can be set up in connection with this rotation surface, which is combined as an active and self-locking wedge surface. The opening provides the possibility of a visible display of the insertion position of each processing instrument in the extension unit. The opening also creates a simple separation option for an inserted machining tool. In addition, this opening means that the active surface can be given a position which is advantageous from the standpoint of production. The opening is preferably made with the aid of an inclined, segment-shaped cut which is milled into the cutout. The receptacle is preferably arranged centrally in the extension unit, the depression running along its longitudinal axis towards this opening. Due to the inclination of this recess / opening, the inclined expansion of the surface towards the other end of the extension unit can be achieved.

The extension unit is preferably made with two cylindrical parts that protrude from each side of the cutout. The cylindrical part carrying the fastening part of the extension unit is designed with a first, preferably smallest, diameter. The part carrying the receptacle is formed with a diameter that is larger than this first diameter. The cutout has a diameter or an external dimension that is larger than the second diameter.

Compared to previous extension units, such as that described in the aforementioned GB-A-2 058 615, the proposed construction provides a smooth, easy-to-use and reliably functioning extension unit, which significantly reduces the number of processing tools in the sets used. For example, the reduction in processing instruments and the economical manufacture of the extension unit result in good overall economy when used in medical care. Handling is extremely simple in that the extension unit is inserted into the rotating unit in the same way as any processing instrument. Each processing instrument can be easily inserted into the extension unit and safely arranged in it using the self-locking wedge principle. The separation of each processing instrument from each extension unit can be carried out easily, for example thanks to the fact that a finger, a tool, etc. can be easily placed over this opening to bring about the separation. The use of this inclined surface can result in the machining instrument being displaced slightly about its axis of rotation. However, this has no effect, since the work in question involves rotating at a low speed, for example at around 2000 rpm. The extension unit can be made from a single piece, which has a thicker central part and two substantially cylindrical parts, one of which is made with fasteners and the other with a receptacle. The middle part is provided with an inclined and advantageously cut-out opening, which is predetermined on one side of the unit.

A currently proposed embodiment of a device with the characterizing features of the invention is described below with reference to the attached drawings, in which:

1 shows a basic diagram of parts of a known rotary unit;

2 shows the first type of a machining instrument from the side, a machining instrument being shown separately and a machining instrument being inserted into an extension unit;

3 shows the second type of machining instrument, the machining instruments themselves being available in a number of lengths (for example 4) and each machining instrument in turn can be inserted into an extension unit;

4 shows the third type of processing instrument, which is shown separately and also inserted into an extension unit;

5 shows the fourth type of processing instrument (cf. FIG. 3);

Figure 6 shows the detailed construction of the extension unit in a longitudinal section.

Figure 7 is a view of the first end of the unit of Figure 6; and

8 is a view of the second end of the unit of FIG. 6th

FIG. 1 shows the head of a rotary unit 1, which is known per se and is designed for holding processing tools / drills of different types 2 to 12 according to FIGS. 2 to 5. Each machining instrument of the machining instruments 2 to 12 has a fastening part 2a which is formed with a rear flange 13 and a recess (recess) 14 which is arranged behind the latter. Each machining instrument has a head 15 with an associated part 16 which effects the machining. Since the processing instruments themselves, like the rotary unit, are already well known, they are not described in detail here. Each processing instrument can be inserted into an extension unit 17. The basic construction of the extension unit is the same in FIGS. 2 to 5, for which reason only the extension unit in FIG. 2 is described in detail. The extension unit 17 is formed with a fastening part 17a, which basically corresponds to the construction of the fastening part 2a in each processing instrument. In this regard, the attachment part can be inserted into the rotary unit 1 in a manner that corresponds to each machining instrument. The rear flange on the fastening part of the extension unit has reference number 18 and the following groove has reference number 19. The extension unit carries at its end 17b the processing instrument 2 'corresponding to that set out below.

2 shows the possibility of achieving different (two) drill lengths L and L 'with the aid of a processing instrument 2 and an extension unit 17. In the first-mentioned case, the processing tool is inserted directly into the rotation unit 1 and in the last-mentioned case it is inserted into the extension unit, which in turn is inserted or has been inserted into the rotation unit 1.

3 shows that it is possible to achieve seven different machining instrument lengths with the aid of four machining instruments 3, 4, 5 and 6 and an extension unit 17 '.

4 shows the possibility of achieving three different machining instrument lengths with the aid of two machining instruments 7, 8 and an extension unit 17 '.

FIG. 5 shows a case that corresponds to that of FIG. 3. 2 to 5 also show different types of processing instruments.

According to FIG. 6, the extension unit is manufactured in the factory from a first cylindrical part 20 with a diameter D1, a second cylindrical part 21 with a second diameter D2 and a section 17c which is arranged between the parts 20 and 21. As can be seen from FIGS. 6 and 8, a segment-shaped part is removed from the cylindrical part 20. The length of the removed part is indicated by the reference symbol a. A surface 22 is formed by the segment-shaped depression, which is straight in the longitudinal and transverse directions of the extension unit. A receptacle 23 runs in the middle and in the longitudinal direction of the extension unit. The part 17c is provided with an opening 24 which is produced with the aid of an inclined recess / cut, the wall of which is indicated by the reference number 25. The recess is inclined so that its axis 26 is inclined relative to the perpendicular 27 of the longitudinal axis 28 of the extension unit. The bottom surface 29 of the opening is thus beveled relative to this longitudinal axis 28. This base surface 29 is preferably straight in the essential longitudinal and transverse directions of the extension unit and is also beveled in the longitudinal section, which is shown in FIG. 6, relative to the longitudinal axis 28. The surface widens toward the second end 17b '. The degree of beveling can be in the range from 20 to 60, and in the illustrated case it is selected up to about 40. The middle part 17c is preferably thicker than the parts 20 and 21. In a preferred embodiment, the diameter D1 is smaller than the diameter D2, which in turn is smaller than the diameter D3 (in the circular, central section 17c) or the external dimension (in the non-circular, central section) of the central part 17c.

A surface 30 on the fastening part 31 of a processing instrument inserted into the extension unit can be placed on the inclined or beveled surface 29.

The surface 30 basically has a shape that corresponds to the surface 22 on the extension unit. This surface 30 is thus straight in the longitudinal and transverse directions of the processing instrument and furthermore essentially parallel to the longitudinal axis 28 of the longitudinal section shown in FIG. 6. The straight surfaces 29 and 30 therefore form a rotationally fixed contact between the extension unit and the processing instrument which is inserted in the latter. Due to the inclination or inclination of the surface 29, a fixing effect in the longitudinal direction of the machining instrument is achieved which corresponds to the longitudinal axis 28. The machining instrument in question can be pressed into its position by holding its head (see reference number 15 in FIG. 2) and moving its fastening part 31 into the receptacle 23, which is shown in FIG. 6. The opening provides a visible display of the insertion position of the processing instrument in the longitudinal direction relative to the extension unit. The opening / recess 24 can also serve as an access point when the processing instrument is separated from the extension unit. The cut or the recess 24 is formed in such a way that it runs downward from the outside (outer surface) 32 of the cutout 17c, below the central axis 28. The receptacle 23 and the recess 24 are in contact with their inner parts. A segment-shaped, radially extending surface 33 is arranged at the transition.

The extension unit is approximately 30 mm long and the recess 24 has a length of approximately 3 mm. The approximate values ​​for the diameters D1 to D3 are 2.35, 3.5 and 5.5 millimeters, respectively. The receptacle 23 is designed in such a way that it effects good guidance of each processing instrument.

The invention is not limited to the exemplary embodiment shown above, but may be subject to modifications within the scope of the following claims and the concept of the invention.