TOOL FOR PRODUCING A RECESS IN BONE TISSUE

Abstract

The present invention provides a tool for producing a recess in bone tissue for an implant, said tool comprising a first elongated tool segment with a first longitudinal axis and a receiving area, said receiving area having, about the first longitudinal axis, a first functional surface that is orientated substantially radially outwards and a second functional surface that is orientated radially inwards. The tool furthermore comprises a second elongated tool segment with a second longitudinal axis and an insertion section that can be inserted into the receiving area of the first tool segment, said insertion section having, about the second longitudinal axis, at least one functional surface that is orientated radially outwards and interacts with the first functional surface of the first tool segment that is orientated radially outwards. In addition, one of the at least one functional surfaces of the insertion section interacts with the second functional surface of the first tool segment. One of the interacting functional surface pairs is thereby engaged with one another for transmitting torque and the other of the interacting functional surface pairs allows a relative movement therebetween.

Claims

1-12. (canceled)

13. A tool (1) for producing a recess in bone tissue for an implant, said tool comprising: a first elongated tool segment (10) with a first longitudinal axis (L1) and a receiving area (14), said receiving area having, about the first longitudinal axis, a first functional surface (15) that is orientated substantially radially outwards and a second functional surface (16, 17, 18) that is orientated radially inwards, a second elongated tool segment (20) with a second longitudinal axis (L2) and an insertion section (24) that can be inserted into the receiving area of the first tool segment, said insertion section having, about the second longitudinal axis, at least one functional surface (25, 26, 27, 28) that is orientated radially outwards and interacts with the first functional surface (15) of the first tool segment that is orientated radially outwards, and one of the at least one functional surfaces (25, 26, 27, 28) of the insertion section interacting with the second functional surface (16, 17, 18) of the first tool segment, wherein the first longitudinal axis and the second longitudinal axis intersect, one of the interacting pairs of functional surfaces (15, 16, 17, 18, 25, 26, 27, 28) is engaged with one another for transmitting torque, and the other of the interacting pairs of functional surfaces (15, 16, 17, 18, 25, 26, 27, 28) allows a relative movement therebetween.

14. A tool (1) according to claim 13, wherein the first functional surface (15) of the first tool segment (10) is formed by a projection (11) in the receiving area (14), said projection preferably being conical or cylindrical.

15. A tool (1) according to claim 13, wherein the engaged pair of functional surfaces (15, 16, 17, 18, 25, 26, 27, 28) for the transmission of torque is engaged with a form-fit.

16. A tool (1) according to claim 14, wherein the engaged pair of functional surfaces (15, 16, 17, 18, 25, 26, 27, 28) for the transmission of torque is engaged with a form-fit.

17. A tool (1) according to claim 13, wherein at least the cross-sections of the functional surfaces (15, 16, 17, 18, 25, 26, 27, 28) of at least one pair of functional surfaces perpendicular to the respective longitudinal axis (L1, L2) have a substantially circular circumference.

18. A tool (1) according to claim 14, wherein at least the cross-sections of the functional surfaces (15, 16, 17, 18, 25, 26, 27, 28) of at least one pair of functional surfaces perpendicular to the respective longitudinal axis (L1, L2) have a substantially circular circumference.

19. A tool according to claim 13, wherein the first tool segment (10) and the second tool segment (20) comprise at least two separate functional surface pairs (15, 16, 17, 18, 25, 26, 27, 28) interacting therebetween.

20. A tool according to claim 14, wherein the first tool segment (10) and the second tool segment (20) comprise at least two separate functional surface pairs (15, 16, 17, 18, 25, 26, 27, 28) interacting therebetween.

21. A tool according to claim 13, wherein the first tool segment (10) and the second tool segment (20) comprise at least three separate functional surface pairs (15, 16, 17, 18, 25, 26, 27, 28) interacting therebetween, wherein the first pair of functional surfaces (15, 25) permits a relative movement therebetween, the second pair of functional surfaces (16, 26) supports the insertion section (24) in the receiving area (14), and the torque can be transmitted between the first and the second tool segments by the third pair of functional surfaces (18, 28).

22. A tool according to claim 14, wherein the first tool segment (10) and the second tool segment (20) comprise at least three separate functional surface pairs (15, 16, 17, 18, 25, 26, 27, 28) interacting therebetween, wherein the first pair of functional surfaces (15, 25) permits a relative movement therebetween, the second pair of functional surfaces (16, 26) supports the insertion section (24) in the receiving area (14), and the torque can be transmitted between the first and the second tool segments by the third pair of functional surfaces (18, 28).

23. A tool according to claim 13, wherein the functional surface (15) of the first tool segment (10) that is orientated radially outwards is exchangeable and preferably part of a third tool segment (30).

24. A tool according to claim 14, wherein the functional surface (15) of the first tool segment (10) that is orientated radially outwards is exchangeable and preferably part of a third tool segment (30).

25. A tool according to claim 13, wherein at least one of the tool segments (10, 20, 30) comprises at least one cutting element (12, 22, 32) on an outward facing circumferential surface.

26. A tool according to claim 14, wherein at least one of the tool segments (10, 20, 30) comprises at least one cutting element (12, 22, 32) on an outward facing circumferential surface.

27. A tool according to claim 13, wherein the receiving area (14) of the first tool segment (10) comprises a holding surface (13) which is formed by a cross-sectional extension within the receiving area and on which a corresponding cross-sectional extension of the insertion section (24) is supported in the inserted state such that the second tool segment is held in the first tool segment.

28. A tool according to claim 14, wherein the receiving area (14) of the first tool segment (10) comprises a holding surface (13) which is formed by a cross-sectional extension within the receiving area and on which a corresponding cross-sectional extension of the insertion section (24) is supported in the inserted state such that the second tool segment is held in the first tool segment.

29. A tool (1) according to claim 13, wherein a pair of functional surfaces is arranged at the height of the intersection of the first longitudinal axis (L1) and the second longitudinal axis (L2), said pair comprising a functional surface (26, 27, 28) of the insertion section (24) that is orientated radially outwards and a functional surface (16, 17, 18) of the receiving area (14) that is orientated radially inwards, and the pair of functional surfaces is preferably suitable for transmitting torque.

30. A tool (1) according to claim 14, wherein a pair of functional surfaces is arranged at the height of the intersection of the first longitudinal axis (L1) and the second longitudinal axis (L2), said pair comprising a functional surface (26, 27, 28) of the insertion section (24) that is orientated radially outwards and a functional surface (16, 17, 18) of the receiving area (14) that is orientated radially inwards, and the pair of functional surfaces is preferably suitable for transmitting torque.

31. A tool segment (10) with a longitudinal axis (L1), about which a receiving area for insertion of a further tool segment (20) is formed, said receiving area comprising an opening, a functional surface (16, 17, 18) that is orientated radially inwards, and an end face formed at least in sections by a functional surface (15) that is orientated radially outwards, wherein one of the functional surfaces (15, 16, 17, 18) is provided for the transmission of torque to the other tool segment and the other functional surface (15, 16, 17, 18) is configured to allow a relative movement to the other tool segment.

32. A set consisting of a tool according to claim 13 and an implant, in particular an endoprosthesis, which can be inserted into a recess that can be generated by the tool in the bone tissue of a long bone.

Description

BRIEF DESCRIPTION OF THE FIGURES

[0047] In the accompanying figures, to which reference is made in the following in the context of the detailed description of preferred embodiments, elements having the same function and/or design are identified by the same reference numbers.

[0048] FIG. 1 shows a schematic view of an embodiment example of the tool according to the invention, which is configured in three parts,

[0049] FIG. 2 shows a schematic sectional view of an embodiment example of the tool according to the invention, which illustrates the reciprocal bearing of two tool segments, and

[0050] FIG. 3 shows a schematic, three-dimensional side view of an embodiment example of the tool according to the invention to illustrate the kinematics.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

[0051] In the following description, the term “distal” refers to the side of a component which lies at the front in the direction of advancement of the tool. Accordingly, the term “proximal” refers to the side of a component which lies at the rear in the direction of advancement of the tool.

[0052] FIG. 1 shows an embodiment example of a tool 1 according to the invention, with which a recess can be produced in a long bone. The tool 1 comprises a first tool segment 10, a second tool segment 20 and a third tool segment 30.

[0053] The second tool segment 20 comprises cutting elements 22 with which a recess or hole can be produced in a bone, in particular a long bone. The tool 1, configured as a reamer, can equally be provided to widen an already existing or prepared opening in the bone tissue. The tool 1 is therefore, as already described above, provided to prepare a recess, which is adapted with respect to its geometry and its dimensions to an implant to be implanted.

[0054] The elongated tool segment 20, which is located at the front in the direction of advancement, may have a conical shape, as shown in FIG. 2. It is also possible to configure the tool 1 to produce a cylindrical opening, as is the case for the first tool segment 10. Cutting elements 22 are provided on the circumference of the second tool segment 20 to generate the recess. By means hereof, surrounding bone tissue can be removed by rotation of the second tool segment 20 around its longitudinal axis.

[0055] Furthermore, the second tool segment 20 comprises an insertion section 24 for connection to the first tool segment and for transmitting a rotation between the two tool segments. When viewed along the longitudinal axis, the insertion section 24 is located at the rear end of the second tool segment 20 in the direction of advancement.

[0056] The insertion section 24 can be inserted into a receiving area 14, not shown, of the first tool segment 10. As is described in more detail below, the first tool segment 10 and the second tool segment 20 are thereby arranged at an angle to one another.

[0057] In the shown embodiment of the tool 1, the first tool segment 10 can also comprise cutting elements 12 arranged on the circumference in the longitudinal direction of the tool segment 10 for forming a recess or opening in the bone tissue. As is apparent in FIG. 1 in view of the circumferential surface formed by the cutting elements 12, the tool segment 10 is provided for forming a cylindrical hole. An embodiment that is tapered at least in sections can, of course, also be provided for the first tool segment 10. It is furthermore possible to only provide cutting elements 12 in sections or to provide no cutting elements 12 at all on the first tool segment 10.

[0058] The receiving area 14 (see FIG. 2), into which the second tool segment 20 can be inserted, is provided at the side located at the front in the direction of advancement of the first tool segment 10. A receiving area for a third tool segment 30 is provided on the opposite side of the first tool segment 10 in the longitudinal direction.

[0059] In the present embodiment example, the third tool segment 30 is detachably connected to a thread 19, preferably a threaded hole, of the first tool segment 10 via a projection 11 comprising a thread 34. Alternatively, other connection techniques known to the person skilled in the art for rotary tools may also be used. It is furthermore possible to configure the first tool segment 10 and the third tool segment 30 as one piece.

[0060] The third tool segment 30 can also comprise cutting elements 32, as shown in the embodiment example of FIG. 1.

[0061] Located at the distal end of the elongated third tool segment 30 is the aforementioned thread 34 for connection to the first tool segment 10. A clamping element 36 is provided at the opposite or proximal end of the third tool segment 30, which is configured to be cylindrical in the present embodiment and can be clamped, for example, in a drill. A torque introduced via the connecting element 36 can be transmitted from the third tool segment 30 to the first tool segment 10 and, in turn, from this segment to the second tool segment 20.

[0062] This modular design of the tool 1 has the advantage that it can be adapted very well to the implant to be implanted or to the opening to be created herefor in the bone tissue.

[0063] FIG. 2 shows a sectional view through the first tool segment 10, which is connected at its proximal end to a third tool segment 30 and at its distal end to a second tool segment 20. In the illustrated embodiment of the first tool segment 10, it comprises a through-hole. This through-hole is provided at its proximal end with a thread 19 for receiving a threaded portion 34 on a distal projection of the third tool segment 30. The free space remaining in the through-hole after screwing in the threaded portion 34 forms the receiving area 14 for the insertion section 24 of the second tool segment 20.

[0064] Viewed from the proximal to the distal end, the receiving area 14 comprises a second functional surface 16 that is orientated radially inwards, an annular holding surface 13, a third functional surface 17 that is orientated radially inwards and a fourth functional surface 18 that is orientated radially inwards. The functional surfaces are preferably cylindrical, as shown, and are more preferably circular cylindrical. As is described below within the context of modifications of the present embodiment, fewer functional surfaces may also be provided.

[0065] The second functional surface 16 that is orientated radially inwards has an internal dimension I16 which is greater than the internal dimension I17 of the third functional surface 17 that is orientated radially inwards. Due to the resulting extension of the receiving area 14 in the proximal direction, a shoulder is formed, which forms an annular holding surface 13 in the receiving area 14 of the second tool segment 20. The annular holding surface 13 is preferably formed perpendicular to the longitudinal axis L1 of the first tool segment 10. The fourth functional surface that is orientated radially inwards has an internal dimension 118, which is in turn greater than the diameter I17.

[0066] In the embodiment illustrated in FIG. 2, the functional surfaces 16 and 17 that are orientated radially inwards are circular cylindrical. The internal dimension I16 of the second functional surface 16 and the internal dimension I17 of the third functional surface 17 are consequently internal diameters. By contrast, the fourth functional surface 18 of the first tool segment 10 that is orientated radially inwards is formed with a geometry that allows engagement with a corresponding functional surface 28 of the insertion section for transmission of a torque. It is a hexagon in the present embodiment example in FIGS. 2 and 3. It is to be understood that any other polygon or geometry may be used, provided that it allows torque to be transmitted. This applies accordingly to the fourth functional surface 28 of the second tool segment 20 that is orientated radially outwards.

[0067] Furthermore, located in the receiving area 14 of the first tool segment 10 is a first functional surface 15 that is orientated radially outwards, which is formed in the present embodiment by the projection 11 of the third tool segment 30 that is provided with a thread 34. It is alternatively possible to configure the first functional surface 15 that is orientated radially outwards as part of the first tool segment 10. In the embodiment illustrated in FIG. 2, the functional surface 15 is formed as a conical surface.

[0068] When viewed from the proximal to distal end, the insertion portion 24 of the second tool segment 20 inserted into the receiving area 14 comprises a first functional surface 25 that is orientated radially outwards, a second functional surface 26 that is orientated radially outwards, a third functional surface 27 that is orientated radially outwards and, as already mentioned above, a fourth functional surface 28 that is orientated radially outwards.

[0069] The functional surfaces 25, 26 and 27 taper in the illustrated embodiment from the distal end towards the proximal end point 29 of the insertion section 24. The first functional surface 25 of the second tool segment 20 that is orientated radially outwards is conical just like the first functional surface 15 of the first tool segment 10 that is orientated radially outwards. At least one of the functional surfaces 15 and 25 may likewise have the shape of a truncated cone.

[0070] The second functional surface 26 that is orientated radially outwards connects distally to functional surface 25 that is orientated radially outwards, and has the shape of a truncated cone. The functional surface 27, which also has the shape of a truncated cone, adjoins the functional surface 26. It has a smaller diameter at its proximal end than the distal base 21 of the truncated cone of the functional surface 26, which is also located at this proximal end. As a result, a shoulder is formed by the functional surface 26 and the functional surface 27. The shoulder surface serves as an annular support surface 23, which, as described below, interacts with the holding surface 13 of the first tool segment.

[0071] As described above, the tool 1 comprises, for the transmission of torque, at least one pair of functional surfaces that allows a relative movement therebetween, and at least one pair of functional surfaces that is engaged with a form fit or friction fit.

[0072] In the tool, the engaged pair of functional surfaces forms the torque transmitting device for transmitting a torque between the tool segments. With the aid of this torque, a cutting movement is performed by at least one of the tool segments. The pair of functional surfaces that allows a relative movement, i.e. slipping, in its contact region is on the other hand provided for support and guidance between the first and second tool segments, and thus transfers the forces in the longitudinal direction between the tool segments.

[0073] In the embodiment example illustrated in FIG. 2, more pairs of functional surfaces are, however, used in order to achieve as defined a sequence of movement as possible between the first tool segment 10 and the second tool segment 20.

[0074] The pair of functional surfaces which allows a relative movement therebetween is formed by the functional surfaces 15 and 25. As described above, the engaged pair of functional surfaces is formed by the functional surfaces 18 and 28. The functional surfaces 18 and 28 are thereby engaged with a form fit, which in general ensures a better transmission of torque than a friction-fit engagement. Furthermore, the effective or pitch circle diameter of the engaged functional surfaces 18 and 28 is approximately at the height of the intersection of the longitudinal axis L1 of the first tool segment 10 and the longitudinal axis L2 of the second tool segment 20.

[0075] The effective circle diameter or pitch circle diameter of a functional surface is the diameter on which lie the contact points where the perimeters of two interacting functional surfaces come into contact. As in gear technology, a gear ratio can be determined by the ratio between the effective circle diameters of two gear elements, for example two gearwheels. Since the effective circle diameters of the functional surfaces 18 and 28 are at the height of the intersection between the longitudinal axes L1 and L2 and since the longitudinal axis L1 forms the central point of the effective circle diameter of the functional surface 18 and the longitudinal axis L2 forms the central point of the effective circle diameter of the functional surface 28, the two effective circle diameters are approximately the same size, and thus the gear ratio is approximately 1:1.

[0076] Furthermore, a pair of functional surfaces is provided in the embodiment shown in FIG. 2, which supports the insertion section 24 in the receiving area 14. This pair consists of the second functional surface 16 of the first tool segment 10 which is orientated radially inwards and the second functional surface 26 of the second tool segment 20 which is orientated radially outwards. Alternatively or additionally, the pair of functional surfaces comprising the third functional surface 17 of the first tool segment 10 which is orientated radially inwards and the third functional surface 27 of the second tool segment 20 which is orientated radially outwards may be provided as a supporting functional surface pair.

[0077] The surfaces of the supporting and guiding functional surface pair roll against one another. Consequently, they allow substantially no relative movement between them and are also not provided for transmission of torque.

[0078] The interaction between the three pairs of functional surfaces is complemented in the present embodiment by supporting the support surface 23 on the holding surface 13 in the receiving area 14. The support of the support surface 23 on the holding surface 13 in particular ensures a defined contact between the functional surfaces 15 and 25 and the functional surfaces 26 and 16. At the same time, the insertion section 24 of the second tool segment 20 is reliably held in the receiving area 14 of the first tool segment 10.

[0079] So that the insertion section 24 can be inserted into the receiving area 14 in such a manner that the support surface 23 of the second tool segment 20 can reach behind the holding surface 13 of the first tool segment 10 in the proximal direction, a section of the insertion section 24 and/or the functional surface 15 that is orientated radially outwards is preferably configured to be elastically flexible. Alternatively or additionally, insertion of the insertion section 24 can take place in that the tool segment 30 is only completely screwed into the first tool segment 10 once the insertion section 24 of the second tool segment 20 has been inserted through the distal opening of the receiving area 14.

[0080] In the simplest case, however, the insertion section 24 and the receiving area 14 are dimensioned such that insertion of the insertion section 24 is possible without an elastic flexibility that is specifically provided therefor or without locking by the projection 11 of the third tool segment. The holding surface 13 and the support surface 23 hereby substantially prevent the second tool segment 20 from inadvertently falling out of the first tool segment 10, but not, however, with the same degree of reliability as the two previously described embodiments. On the other hand, it is particularly easy to exchange the first tool segment 10 in this embodiment.

[0081] Driving of the tool segment 20 takes place via the clamping element 36 shown in FIG. 1. The rotation introduced via this element is transmitted directly to the first tool segment 10. The transmission of torque from the first tool segment 10 to the second tool segment 20 then occurs, as described above, at the height of the pair of functional surfaces 18, 28 via the insertion section 24 that is inserted into the receiving area 14. However, the kinematic sequence of motion is largely determined by the pair of functional surfaces 15, 25 and the pair of functional surfaces 16, 26 and/or the pair of functional surfaces 17, 27.

[0082] As described above, the path of the tool 1 through the bone tissue results from a pilot hole, a bone density distribution in the bone tissue and/or a medullary cavity of the bone to be treated. The tool segment 20 thereby generally takes the path of least resistance. This path of least resistance thus guides the tool segment 20.

[0083] If initially only the tool segment 20 is guided, for example if only this segment is located in the bone tissue, this results in two movement possibilities that have already been described above between the first tool segment 10 and the second tool segment 20. On the one hand, the insertion section 24 with the longitudinal axis L2 can move on a double-cone circular path relatively about the longitudinal axis L1 of the first tool segment 10. In this state, a rotation can at the same time be transmitted from the first tool segment 10 to the second tool segment 20.

[0084] The movement of the insertion section 24 on a double-cone circular path relatively about the longitudinal axis L1 of the first tool segment 10 results, with reference to FIG. 2, owing to the circular tool path predetermined by the functional surface 15 and the functional surface 16. As an alternative to a circular tool path, other tool paths are also conceivable, such as, for example, a tool path which, due to a correspondingly formed geometry of the functional surface 16 and the functional surface 15, extends in an undulating manner about the longitudinal axis L1. In such an embodiment, the angle α between the longitudinal axes L1 and L2 changes depending on the angular position of the longitudinal axis L1 to the longitudinal axis L2.

[0085] If the first tool segment 10 shown in FIG. 2 is guided, for example by a surgeon's hand, the first tool segment 10 and the second tool segment 20 remain in the same position relative to a global coordinate system, such as the position shown in FIG. 2 or 3. The angle α of the tool segments 10 and to one another results from the angle between the two longitudinal axes L1 and L2, which is in turn determined by the taper angle of the functional surfaces 15 and 25.

[0086] Some possible modification possibilities of the embodiment shown in FIGS. 2 and 3 will be described below.

[0087] In the most simply constructed embodiment, transmission of rotation and support occurs between functional surfaces 15, 25 and 16, i.e. on the one hand at a position at which the functional surfaces 15 and 25 contact one another, and on the other hand at a position that is approximately diametrically opposite to this position, at which the functional surfaces 25 and 16 contact one another.

[0088] In this embodiment, the functional surfaces must be accordingly geometrically adjusted. For example, the second functional surface 16 of the first tool segment 10 that is orientated radially inwards may taper in the proximal direction. This embodiment also has a pair of functional surfaces that allows a relative movement therebetween and a pair of functional surfaces via which the transmission of torque is made possible. However, the pairs of functional surfaces overlap in this embodiment.

[0089] If the pair of functional surfaces that allows a relative movement therebetween is the pair of functional surfaces consisting of the first functional surface 15 that is orientated radially outwards relative to the longitudinal axis L1 and the first functional surface 25 that is orientated radially outwards relative to the longitudinal axis L2, then the pair of functional surfaces that enables transmission of a rotation or torque is between the second functional surface 16 and the first functional surface 25. In this case, the first tool segment 10 and the second tool segment 20 rotate in the same direction.

[0090] Depending on the choice of the respective effective circle diameters of the functional surface 25 and the functional surface 16, it is possible for the second tool segment 20 to rotate at a speed that differs from that of the tool segment 10 by the ratio between the effective circle diameters. In addition to the simple construction, an increase in the rotational speed of the first tool segment 10 relative to the second tool segment 20 is thus possible in this embodiment.

[0091] In a further alternative embodiment, torque transmission can occur between functional surfaces 15 and 25 whilst relative movement is allowed between functional surfaces 16 and 25. In this case as well, the rotational speed between the two tool segments 10 and 20 depends on the ratio of the effective circle diameters of the two functional surfaces 15 and 25. In this embodiment, however, the second tool segment 20 additionally rotates in the opposite direction in relation to the first tool segment 10. In this embodiment, there is consequently a reversal of the direction of rotation in addition to a gear ratio.

[0092] In order to achieve a more stable kinematic behavior of the tool segments 10 and 20 relative to one another, two separate pairs of functional surfaces can be provided. Applied to FIG. 2, the first pair of functional surfaces could be formed from functional surfaces 15 and 25, and the second pair of functional surfaces could be formed from functional surfaces 16 and 26. Alternatively, one of the remaining pairs of functional surfaces 17 and 27 or 18 and 28 could also be used.

[0093] In this embodiment, the relative movement occurs, for example, between the pair of functional surfaces 15, 25, whilst transmission of the rotational movement occurs by means of an engagement between the pair of functional surfaces 16, 26. As described above, the tool segment 10 and the tool segment 20 rotate in the same direction in this case, with the angular velocities of the tool segment 10 relative to the tool segment 20 depending on the ratio of the effective circle diameters of the functional surface 26 relative to the functional surface 16.

[0094] In the reverse case, i.e. an engagement between the functional surfaces 15 and 25 and a relative movement between the functional surfaces 16 and 26, the direction of rotation between the tool segments 10 and 20 is opposite to that of the preceding embodiment. The ratio of the effective circle diameters to one another again applies for the rotational speed.

[0095] Also in the case of the described modifications, a holding surface 13 is preferably provided on the first tool segment and a support surface 23 is preferably provided on the second tool segment.

[0096] Furthermore, in the modifications, there is a difference as regards the rotational speeds of the two tool segments since, differing from the embodiment example in FIG. 2, the torque transmission does not lie at the height of the intersection between the longitudinal axis L1 of the first tool segment 10 and the longitudinal axis L2 of the second tool segment 20. Consequently, the effective circle diameters of the insertion section 24 and the receiving area 14 or the third tool section 30 differ from one another.

[0097] Furthermore, more than two tool segments can also be at an angle to one another according to the invention. For example, the third tool segment can also be at an angle to the first tool segment and thus form a recess with two angles that is intended for an implant.

[0098] The present tool is intended in particular for implants implanted in long bones. These include in particular hip implants since, in this case, the property of the tool that it is able to prepare a hole provided with an angle is of particular advantage in view of the curved course of the natural neck of the femur.

LIST OF REFERENCE NUMBERS

[0099] 1 Tool [0100] 10 First tool segment [0101] 11 Projection in the receiving area [0102] 12 Cutting element [0103] 13 Holding surface in the receiving area [0104] 14 Receiving area [0105] 15 (First) functional surface of the first tool segment that is orientated radially outwards [0106] 16 (Second) functional surface of the first tool segment that is orientated radially inwards [0107] 17 (Third) functional surface of the first tool segment that is orientated radially inwards [0108] 18 (Fourth) functional surface of the first tool segment that is orientated radially inwards [0109] 19 Threaded hole [0110] 20 Second tool segment [0111] 21 Distal base of the truncated cone formed by the functional surface 26 [0112] 22 Cutting element [0113] 23 Supporting surface [0114] 24 Insertion section [0115] 25 (First) functional surface of the second tool segment that is orientated radially outwards [0116] 26 (Second) functional surface of the second tool segment that is orientated radially outwards [0117] 27 (Third) functional surface of the second tool segment that is orientated radially outwards [0118] 28 (Fourth) functional surface of the second tool segment that is orientated radially outwards [0119] 29 End point of the insertion section [0120] 30 Third tool segment [0121] 32 Cutting element [0122] 34 Threaded section [0123] 36 Clamping element [0124] I16 Interior dimension of the second functional surface of the first tool segment [0125] I17 Interior dimension of the third functional surface of the first tool segment [0126] I18 Interior dimension of the fourth functional surface of the first tool segment [0127] L1 First longitudinal axis [0128] L2 Second longitudinal axis [0129] α Angle between the longitudinal axes L1 and L2