JP2015196090A - Implant System - Google Patents

Abstract

Improving an implant system, particularly a hip implant system, for easier handling. In an implant system, particularly a hip implant system, comprising at least one trial joint head with a spherical or substantially spherical articulating surface that can be clamped into a file shaft or artificial joint stem. One trial joint head comprises at least one release recess 26a, 26b arranged or formed in the region of the joint surface. [Selection] Figure 1

Description

  The present invention relates to an implant system, in particular a hip implant system, comprising at least one trial joint head with a spherical or substantially spherical articulating surface that can be clamped into a file shaft or an artificial joint stem.

  For example, when inserting an implant, particularly a hip implant, into a human or animal body to replace a damaged joint, particularly a damaged hip joint, a bone is first used to insert the artificial joint stem to be implanted. It is very common to prepare a cavity. In order to determine the final position and size of the implant to be inserted, the trial joint head is first tightened to the file shaft, and after the final artificial joint stem is inserted, the trial joint head is first fastened to the artificial joint stem. Connected. This can be done in particular by engaging the filed shaft or the prosthetic stem protuberance with the recess of the trial joint head.

  When inserting the trial head in the above-described manner, especially in the case of a taper connection, the trial joint head cannot be easily pulled out by hand because the trial joint head is too tightly clamped to the file shaft or the artificial joint stem. There is a problem.

DE 28 26 690 C2 DE 10 2008 030 260 A1 DE 10 2008 030 261 A1

  Therefore, an object of the present invention is to improve an implant system of the type described at the beginning so that it can be handled more easily.

  According to the invention, this object is achieved in an implant system of the kind mentioned at the outset, in which at least one trial joint head comprises at least one release recess arranged or formed in the region of the joint surface. Solved.

  Depending on its construction, the release recess allows the surgeon to grasp the trial joint head, eg, by hand, or engage the instrument to twist the trial joint head relative to the file shaft or prosthetic joint stem. By simply twisting, the trial joint head on the file shaft or prosthesis stem can be easily and reliably released, especially in the case of a tapered connection. In addition, by providing at least one release recess in the region of the joint surface, the above twisting operation can be performed without any trouble even with a dirty slippery glove or a very small trial head.

  In order to be able to grip the trial joint head particularly securely, it is advantageous if the trial joint head comprises two, three, four or more release recesses. In this way, for example, the trial joint head can be securely gripped with two, three, four, or five fingers, and the trial joint head can be used as a trial when twisted away from the file shaft or artificial joint stem. Fingers do not slip away from the joint head.

  If two or more release recesses are evenly distributed on the circumference of the at least one trial joint head, the handling and manufacturing of the implant system can be further improved. For example, the release recesses may be evenly distributed on the outer periphery with respect to the longitudinal axis defined by the trial joint head.

  Preferably, said at least one release recess defines a release recess longitudinal axis. In particular, the release recess longitudinal axis may extend parallel to the longitudinal axis defined by the at least one trial joint head. This facilitates the manufacture of the trial joint head on the one hand, and on the other hand, the surgeon directly recognizes in which direction the longitudinal axis of the trial joint head is oriented from the orientation and alignment of the release recess. Can do. In this way, the surgeon can release the trial joint head from the file shaft or the prosthesis stem with a particularly weak force, without exerting an excessive force especially on the already implanted prosthesis stem.

  In order to connect the trial joint head with the file shaft or the artificial joint stem, the at least one trial joint head has a distal direction for tightening connection with the corresponding connection projection of the file shaft or artificial joint stem. It is advantageous if it is provided with a connection receiving part that opens facing. Thereby, the trial joint head can be easily placed on the file shaft or the artificial joint stem in the same manner as the actual implant joint head. The connection projection is in particular formed in the shape of a conical connection tenon.

  Preferably, the connection receiving portion is tapered in a conical shape in a direction toward the joint surface. In other words, the connection receiving portion expands in the opposite direction. As a result, a particularly tapered connection can be formed between the trial joint head and the file shaft or the artificial joint stem. Also, depending on the inclination of the conical surface, a self-braking connection can also be produced between the trial joint head and the file shaft or the artificial joint stem.

  Particularly for cleaning purposes, it is advantageous if the at least one trial joint head is provided with a penetrating part that forms a liquid flow path between the joint surface and the connection receiving part. In this way, the cleaning liquid can surely flow out from the connection receiving portion when the trial joint head is cleaned and reused, particularly when sterilizing.

  If the penetration part is formed in the shape of a hole, the penetration part can be provided particularly easily.

  If the at least one release recess is provided with a release recess surface that faces away from the at least one trial joint head, the release recess can be particularly firmly grasped or engaged with a tool.

  Preferably, the release recess surface is curved concavely facing away from the at least one trial joint head. In this way, it is possible to form a release recess that forms a recess particularly in the joint surface. Therefore, the trial joint head can be reliably grasped even with particularly dirty and slippery gloves. Alternatively, the release recess surface may be formed flat.

  If the release recess surface is formed in the form of a hollow cylindrical surface piece, the release recess surface can be manufactured particularly easily. In this way, the release recess surface can be formed by, for example, milling.

  The construction and manufacture of the trial joint head can be further facilitated if the at least one release recess is formed symmetrically with respect to a symmetry plane including a longitudinal axis defined by the at least one trial joint head. . For example, the curvature of the concave release concave surface may coincide with or substantially coincide with the curvature of the preferably convex joint surface of the at least one trial joint head, but larger or smaller than this curvature. May be.

  The at least one trial joint head is particularly easily released from the file shaft or the artificial joint stem if the at least one release recess is formed in the form of a gripping recess and / or in the form of a tool element receptacle. be able to. This means in particular that the at least one trial joint head may comprise at least one gripping recess and / or at least one tool element receptacle. Of course, the trial joint head may comprise a plurality of gripping recesses and / or tool element receptacles. Furthermore, the tool element receiving part may be arranged or formed in the region of the holding recess. This is particularly relevant when the trial joint head cannot be released by hand, especially when the trial joint head is too tightly clamped to the file shaft or prosthesis stem. The advantage is that a mating tool can optionally be used to exert a greater release force to facilitate the release of the at least one trial joint head from the file shaft or prosthesis stem. In particular, the tool element receiving part may be arranged or formed symmetrically with respect to the holding recess. Optionally, the plurality of gripping recesses and tool element receiving portions may be evenly distributed on the outer periphery of the trial joint head, for example, and may be offset.

  Preferably, the tool element receptacle is open in a direction radially away from the at least one trial joint head with respect to the longitudinal axis defined by the at least one trial joint head. In this way, in order to release the at least one trial joint head from the file shaft or the artificial joint stem by engaging the tool with the tool element receptacle easily and reliably, in particular torque is applied to the trial joint head. Can be easily affected.

  It is advantageous if the tool element receiving part defines a setback (part recessed stepwise from the wall surface) with respect to the holding recess. This allows the surgeon to first attempt to release the trial joint head from the file shaft or prosthetic stem, especially by twisting by hand. If this is unsuccessful, the trial joint head can be twisted away from the file shaft or prosthesis stem by additionally using a tool that is engageable with at least one tool element receptacle.

  If the tool element receiving part has two inner surfaces extending in parallel or substantially parallel to each other, the trial joint head can be formed particularly easily. If it does in this way, a tool element receiving part can be manufactured by milling in the shape of a notch, for example. The inner surfaces may in particular face each other. Another internal connection surface connecting both inner surfaces extending parallel to each other may be curved, in particular concavely, to define a hollow cylindrical inner surface. Optionally, the inner surface may extend transversely, in particular perpendicularly to the longitudinal axis.

  If the inner surface extends parallel to the longitudinal axis of the at least one trial joint head, the torque for releasing the at least one trial joint head from the file shaft or artificial joint stem is particularly efficient. Can affect. Alternatively or optionally, the inner surface may extend transversely, in particular perpendicularly to the longitudinal axis. For example, using a corresponding tool with a corresponding recess provided in the corresponding recess of the trial joint head, for example a projection that engages a hole oriented transversely to the longitudinal axis, in particular a protruding pin, the trial joint head is It can be twisted from the side of the outer periphery.

  In order to allow an easy and reliable connection between a tool and the at least one trial joint head, it is advantageous if the tool element receptacle defines a stopper acting in the proximal direction. This can prevent the tool from sliding away from the at least one trial joint head in the distal direction.

  If the stopper includes a stopper surface facing in the proximal direction, the stopper can be easily formed. In this way, for example, the distal end or the distal end surface of the tool hits the stopper surface, and movement of the tool in the distal direction with respect to the trial joint head is prevented.

  Preferably, the stopper surface extends in a direction intersecting the inner surface, in particular perpendicularly. In this way, the defined stopper can be provided easily and reliably. Optionally, the stopper surface may be formed inclined slightly downward. In this way, the cleaning liquid, particularly water, can flow out more smoothly during cleaning.

  Furthermore, it can be advantageous if one tool element receptacle is assigned to each gripping recess. In particular, the tool element receiving part may be arranged or formed symmetrically with respect to the holding recess. As described above, it is possible to easily and reliably always find a tool element receiving portion suitable for a tool regardless of the alignment state of the trial joint head. Optionally, this assignment may be made such that the gripping recesses and the tool element receivers are evenly distributed, for example, on the outer circumference of the trial joint head.

  In order to ensure sufficient stability of the trial joint head, it is advantageous if the central length of the tool element receiving part coincides with about half the central length of the gripping recess.

  An implant system can be manufactured particularly easily if the at least one trial joint head is made of plastic. In that case, preferably the plastic is a sterilizable plastic. In particular, the different sizes of the trial joint head may be characterized by different colors. This can be easily realized, for example, by coloring plastic.

  Where the trial joint head is particularly tightly clamped on the file shaft or prosthesis stem, the implant system includes at least one release tool with at least one release element, the release element being said at least It is preferable if it is formed so as to correspond to or substantially correspond to the at least one release recess of one trial joint head. If at least one trial joint head cannot be manually released from the file shaft or prosthetic stem, or if it is not desirable to do so, this can be done easily and reliably using at least one release tool. it can. To release, it is only necessary to engage at least one release element of the release tool with at least one release recess of at least one trial joint head.

  For trial joint heads of different sizes, release tools that are specifically formed accordingly may be provided. Furthermore, the shape of the release tool may also be different, for example, the structure and orientation of the release element of the release tool may be different.

  The at least one release tool can be formed particularly easily if the at least one release element is formed in the form of a release protrusion. In that case, the release protrusion can easily be engaged with a release recess, for example a release recess in the form of a tool recess.

  According to another preferred embodiment of the invention, the at least one release element can be frictionally and / or shape-engaged engaged with the at least one release recess. In particular, the at least one release element can be frictionally and / or shape-engaged engaged with the at least one release recess in the form of a tool recess.

  Advantageously, the at least one release tool includes two, three, four or more release elements. These release elements are particularly arranged and formed such that two, three, four or more release recesses, in particular tool recesses, of the at least one trial joint head can be engaged simultaneously. It may be.

  In particular, the at least one release tool includes a handle, and the at least one release element is arranged or formed at a distal end or a distal end region of the handle, thereby allowing for handling of the release tool. Can be improved easily.

  Furthermore, it may be advantageous if the at least one release element is aligned parallel or substantially parallel to the handle. Thus, for example, by twisting the release tool about the longitudinal axis of the handle defined by the handle, the at least one trial joint head can be easily twisted away from the file shaft or artificial joint stem. “Substantially parallel” means in particular that the at least one release element and the handle may form a small angle, in particular up to 10 °.

  Further, the at least one release element defines a release element longitudinal axis, the handle defines a handle longitudinal axis, and an angle formed between the release element longitudinal axis and the handle longitudinal axis is Preferably, it is within the range of about 90 ° to about 180 °. Such an angle formation between the release element and the handle allows the release tool to be coupled with the at least one trial joint head even when the surgical procedure is different. In particular, depending on the surgical method, there may be a case where an angle that makes it impossible to connect a release element having a linearly extended shape to the trial joint head is unavoidable.

  In order to improve the handling of the implant system, it is advantageous if the at least one release tool comprises a gripping element arranged or formed at the proximal end or proximal end region of the handle. For example, the gripping region may be formed at the proximal end of the handle in the form of a thick portion of the handle. Furthermore, it is possible to form the gripping element with one or two wing-like projections projecting laterally from the handle, so that torque can easily be exerted with respect to the handle longitudinal axis.

  If the release tool is formed as a single item, it is particularly easy to manufacture the release tool. The release tool can be formed, for example, by stamping from a flat material.

  It is preferred if the release tool is made at least partly from a sterilizable metal. In this way, the stability required for the use of the release tool can be maintained. For example, the sterilizable metal may be flat steel or round steel, in particular instrument steel.

  Furthermore, it is advantageous if the implant system includes two or more trial joint heads with different diameters. In this way, the surgeon can easily determine and select the desired size of the joint head to be ultimately implanted. Preferably, trial joint heads of different sizes will have different colors or corresponding markings so that the surgeon can use these trial joints, especially when the surgical site is contaminated with blood, tissue, or other liquid. The head can be easily identified.

  Thus, the above description specifically includes embodiments of the implant system specifically listed in the form of clauses numbered below.

1. Implant system (10), in particular a hip joint implant system (10) comprising at least one trial joint head (12) with a spherical or substantially spherical articulating surface (14), which can be clamped to a file shaft or artificial joint stem 11)
Implant system, characterized in that the at least one trial joint head (12) comprises at least one release recess (26a, 26b) arranged or formed in the region of the joint surface (14) .

  2. Implant according to clause 1, characterized in that the at least one trial joint head (12) comprises two, three, four or more release recesses (26a, 26b). system.

  3. Implant according to clause 2, characterized in that the two or more release recesses (26a, 26b) are evenly distributed on the outer circumference of the at least one trial joint head (12). system.

  4). The at least one release recess (26a, 26b) defines a release recess longitudinal axis (30) that extends particularly parallel to a longitudinal axis (22) defined by the at least one trial joint head (12). An implant system according to any one of clauses 1 to 3, characterized in that

  5. Said at least one trial joint head (12) comprises a connection receptacle (18) opening in a distal direction for a clamping connection with a corresponding connection projection of a file shaft or prosthesis stem. Implant system according to any one of clauses 1 to 4, characterized in that

  6). 6. Implant system according to clause 5, characterized in that the connection receiver (18) tapers conically in a direction towards the articulating surface (14).

  7). Clause characterized in that the at least one trial joint head (12) comprises a penetration (38) forming a liquid flow path between the articulating surface (14) and the connection receiving part (18) The implant system according to 5 or 6.

  8). Implant system according to clause 7, characterized in that the penetration (38) is formed in the form of a hole (40).

  9. Clauses 1 to 8, characterized in that the at least one release recess (26a, 26b) comprises a release recess surface (32) facing away from the at least one trial joint head (12). The implant system according to any one of the above.

  10. 10. Implant system according to clause 9, characterized in that the release recess surface (32) is concavely curved facing away from the at least one trial joint head (12).

  11. Implant system according to clause 9 or 10, characterized in that the release recess surface (32) is formed in the form of a hollow cylindrical surface piece (34).

  12 The at least one release recess (26a, 26b) is formed symmetrically with respect to a symmetry plane (36) comprising a longitudinal axis (22) defined by the at least one trial joint head (12). The implant system according to any one of clauses 1 to 11,

  13. Clauses 1 to 12, characterized in that the at least one release recess (26a, 26b) is formed in the form of a gripping recess (28) and / or in the form of a tool element receptacle (42). The implant system according to any one of the above.

  14 The tool element receptacle (42) is opened to face in a direction radially away from the trial joint head (12) with respect to a longitudinal axis (22) defined by the at least one trial joint head (12). 14. Implant system according to clause 13, characterized in that

  15. Implant system according to clause 13 or 14, characterized in that the tool element receptacle (42) defines a setback (44) with respect to the gripping recess (28).

  16. Implant according to any one of clauses 13 to 15, characterized in that the tool element receptacle (42) comprises two inner surfaces (46) extending parallel or substantially parallel to each other. system.

  17. Implant system according to clause 16, characterized in that the inner surface (46) extends parallel to the longitudinal axis (22).

  18. Implant system according to any one of clauses 13 to 17, characterized in that the tool element receptacle (42) defines a stopper (48) acting in the proximal direction.

  19. 19. Implant system according to clause 18, characterized in that the stopper (48) comprises a proximally facing stopper surface (50).

  20. 20. Implant system according to clause 19, characterized in that the stopper surface (50) extends in a direction intersecting, in particular perpendicularly, to the inner surface (46).

  21. Implant system according to any one of clauses 13 to 20, characterized in that one tool element receptacle (42) is assigned to each gripping recess (28).

  22. Implant according to any one of clauses 13 to 21, characterized in that the central length of the tool element receptacle (42) corresponds to about half the central length of the gripping recess (28). ·system.

  23. Implant system according to any one of clauses 1 to 22, characterized in that the at least one trial joint head (12) is made of plastic, in particular sterilizable plastic.

  24. Clause characterized by at least one release tool (16) with at least one release element (56) formed to correspond to or substantially correspond to said at least one release recess (26b) 24. Implant system according to any one of 1 to 23.

  25. 25. Implant system according to clause 24, characterized in that the at least one release element (56) is formed in the form of a release protrusion (60).

  26. Said at least one release element (56) engages said at least one release recess (26b), particularly a release recess (26b) in the form of a tool recess (42), in a frictional and / or shape-connective manner. 26. Implant system according to clause 24 or 25, characterized in that

  27. 27. According to any one of clauses 24 to 26, characterized in that the at least one release tool (16) comprises two, three, four or more release elements (56). Implant system.

  28. The at least one release tool (16) includes a handle (54) and the at least one release element (56) is a distal end (62) or distal end region of the handle (54); (64) The implant system according to any one of clauses 24 to 27, characterized in that it is arranged or formed in (64).

  29. 29. Implant system according to clause 28, characterized in that the at least one release element (56) is aligned parallel or substantially parallel to the handle (54).

  30. The at least one release element (56) defines a release element longitudinal axis (80), the handle (54) defines a handle longitudinal axis (52), and the release element longitudinal axis Any of clauses 24 to 29, characterized in that the angle (82) formed between (80) and the handle longitudinal axis (30) is in the range of about 90 ° to about 180 ° The implant system according to one.

  31. The at least one release tool (16) includes a gripping element (76) disposed or formed in a proximal end (74) or proximal end region of the handle (54). 31. An implant system according to any one of clauses 28 to 30.

  32. Implant system according to any one of clauses 24 to 31, characterized in that the release tool (16) is formed as a single piece.

  33. Implant system according to any one of clauses 24 to 32, characterized in that the release tool (16) is at least partly manufactured from a sterilizable metal, in particular from flat steel or round steel.

  34. 34. Implant system according to any one of clauses 1 to 33, characterized by two or more trial joint heads (12) with different diameters.

  The following description of the preferred embodiments of the present invention will explain the invention in greater detail in conjunction with the drawings.

The schematic whole perspective view of the trial joint head before engaging with a release tool. The perspective view of arrangement | positioning of FIG. 1 seen from the side. FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. 4. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG.

  FIG. 1 schematically shows an implant system, generally designated 10, which has one or more clamping connections with a file shaft or prosthesis stem (not shown). Includes multiple trial joint heads.

  The trial joint head 12 exemplarily shown in FIG. 1 includes a spherical or substantially spherical joint surface 14.

  The implant system 10 further includes a plurality of release tools 16.

  The trial joint head 12 includes a connection receiving portion 18 that is tapered in a conical shape particularly in a direction toward the joint surface 14. Accordingly, the connection receiving portion 18 is formed in the shape of an inner cone 20, and the inner cone 20 is formed so as to correspond to a conical connection protrusion protruding from the file shaft or the artificial joint stem. .

  The connection receiving portion 18 is formed concentrically with respect to the longitudinal axis 22, and the longitudinal axis 22 extends in a direction intersecting a flat end surface 24 facing the distal direction of the trial joint head 12.

  The trial joint head 12 includes at least one release recess 26a or 26b arranged or formed in the region of the joint surface 14. The trial joint head 12 exemplarily shown in FIGS. 1 to 4 includes four release recesses 26a and four release recesses 26b.

  The release recess 26 a is formed in the form of a grip recess 28. Each gripping recess 28 defines a release recess longitudinal axis 30. The release recess longitudinal axis 30 extends parallel to the longitudinal axis 22 in the illustrated example of the trial joint head 12.

  The release recesses 26 a and 26 b are equally arranged on the outer periphery of the trial joint head 12, particularly with respect to the longitudinal axis 22.

  The gripping recess 28 defines a release recess surface 32 that faces away from the trial joint head 12.

  In the embodiment of the trial joint head 12 shown in FIGS. 1 to 4, the release concave surface 32 is curved in a concave shape so as to face away from the trial joint head 12.

  In particular, the release recess surface 32 may be formed in the form of a fragment 34 of a hollow cylindrical surface.

  The release recesses 26 a and 26 b are preferably formed symmetrically with respect to the symmetry plane 36 including the longitudinal axis 22.

  The joint head 12 is further provided with a penetration 38, which may be formed in the form of a hole 40 in particular. The penetrating portion 38 forms a liquid flow path between the connection receiving portion 18 and the joint surface 14.

  The release recess 26 b is formed in the form of a tool element receiving portion 42.

  In the embodiment of the illustrated trial joint head 12, each tool element receiving portion 42 is arranged symmetrically with respect to the holding recess 28, and particularly symmetrically with respect to each symmetry plane 36. The tool element receptacle 42 defines a setback 44 with respect to the gripping recess 28.

  The tool element receiving portion 42 is opened with respect to the longitudinal axis 22 so as to face a direction away from the trial joint head 12 in the radial direction. The tool element receiving portion 42 includes two inner surfaces 46 extending in parallel or substantially parallel to each other, and the inner surfaces 46 face each other.

  The inner surface 46 preferably extends parallel to the longitudinal axis 22.

  Furthermore, the tool element receiving part 42 is provided with a stopper 48 acting in the proximal direction, and this stopper 48 includes a stopper surface 50 facing in the proximal direction. The stopper surface 50 extends in a direction intersecting the inner surface 46, preferably vertically.

  In the illustrated embodiment of the trial joint head 12, one tool element receiver 42 is assigned to each gripping recess 28. Thereby, the holding recess 28 and the tool element receiving portion 42 form release recesses 26a and 26b adjacent to or connected to each other.

  In particular, as schematically shown in FIG. 4, the central length of the tool element receptacle 42 corresponds to about half the central length of the gripping recess 28.

  The trial joint head 12 is manufactured from plastic, for example. In that case, the plastic is preferably a sterilizable plastic.

  The implant system 10 may specifically include a plurality of trial joint heads 12. These trial joint heads 12 can be distinguished in particular by the different diameters defined by the articular surface 14.

  For example, if the trial joint heads 12 with different diameters have different colors or marks, the surgeon can easily distinguish the trial joint head 12 during surgery.

  The release tool 16 exemplarily shown in FIGS. 1 to 4 includes a handle defining a handle longitudinal axis 52 and two release elements 56. Alternatively, the release tool 16 may include only one, or three or more release elements 56.

  Both release elements 56 are arranged and formed with respect to each other symmetrically with respect to the mirror plane 58 including the handle longitudinal axis 52. These release elements 56 each define a release protrusion 60 that is formed to correspond to or substantially correspond to one of the release recesses 26b.

  Both release elements 56 form the forked distal end of the release tool 16. These release elements 56 are disposed or formed at the distal end 62 or distal end region 64 of the handle 54.

  In the illustrated embodiment of the release tool 16, the release element 56 is oriented parallel to the handle 54. Since these release elements 56 together form a fork-like arrangement or fork-like end of the release tool 16, both release protrusions 60 are shown as illustratively shown in FIGS. Can be engaged with the tool element receiving portion 42 at the same time while overlapping the through portion 38. In this manner, the release tool 16 can be placed on the trial joint head 12 from the proximal portion until the distal end surface 66 of the release protrusion 60 abuts the stopper surface 50.

  The release element 56 is particularly configured to be able to frictionally and / or shape-connectably engage one or more release recesses 26b.

  The tool element receiving portion 42 further includes an inner surface area 68 which is a hollow cylindrical shape that connects the inner surfaces 46 to each other and faces away from the longitudinal axis 22. The spacing between the inner surface areas 68 of the tool element receptacles 42 arranged opposite to each other with respect to the longitudinal axis 22 in the diametrical direction substantially coincides with the spacing 70 between the opposite side surfaces 72 of the release element 56.

  A gripping element 76 is arranged or formed at the proximal end 74 of the handle 54, which gripping element 76 comprises two gripping portions 78 projecting laterally, in particular perpendicularly, to the handle longitudinal axis 52. ing. In this way, a T-shaped end portion is formed as a whole of the release tool 16.

  The release tool 16 may optionally be formed from round or flat material. The embodiment of the release tool 16 shown schematically in FIGS. 1 to 4 is manufactured from flat material, preferably flat instrument steel, for example by stamping.

  Although not shown in the drawings, there are alternative constructions for the release tool. In an alternative construction, the release element longitudinal axis 80 and the handle longitudinal axis 52 defined by the release element 56 may form a constant angle 82 within the range of about 90 ° to about 180 °. In the embodiment shown in FIG. 2, the angle 82 is 180 °.

  As shown schematically in FIG. 4, when the release element 56 is engaged with the tool element receptacle 42, rotation of the release tool 16 about the handle longitudinal axis 52 twists the trial joint head 12, thereby The trial joint head 12 can be easily released from the file shaft or the connecting projection of the artificial joint stem.

  Even if the release tool 16 is not used, the surgeon engages the finger in the gripping recess 28 and twists the trial joint head 12 about the longitudinal axis 22 to connect the trial joint head 12 and the file shaft or prosthetic stem connection projection. By releasing the clamped taper connection between the two, the surgeon can easily and reliably release the trial joint head 12 from the file shaft or prosthetic stem.

DESCRIPTION OF SYMBOLS 10 Implant system 12 Trial joint head 14 Articulating surface 16 Release tool 18 Connection receiving part 20 Inner cone 22 Longitudinal axis 24 End surface 26a Release recessed part 26b Release recessed part 28 Gripping recessed part 30 Release recessed part longitudinal axis 32 Release recessed part surface 34 Surface fragment 36 Symmetric surface 38 Through portion 40 Hole 42 Tool element receiving portion 44 Setback 46 Inner surface 48 Stopper 50 Stopper surface 52 Handle vertical axis 54 Handle 56 Release element 58 Mirror surface 60 Release protrusion 62 End portion 64 End region 66 End surface 68 Inner surface area 70 Spacing 72 Side surface 74 End portion 76 Grip element 78 Grip portion 80 Release element longitudinal axis 82 Angle

Claims (15)

Implant system (10), in particular a hip joint implant system (10) comprising at least one trial joint head (12) with a spherical or substantially spherical articulating surface (14), which can be clamped to a file shaft or artificial joint stem 11)
Implant system, characterized in that the at least one trial joint head (12) comprises at least one release recess (26a, 26b) arranged or formed in the region of the joint surface (14) (10).   Implant according to claim 1, characterized in that the at least one trial joint head (12) comprises two, three, four or more release recesses (26a, 26b). ·system.   3. The two or more release recesses (26a, 26b) according to claim 2, characterized in that they are evenly distributed on the circumference of the at least one trial joint head (12). Implant system.   Said at least one trial joint head (12) comprises a connection receptacle (18) opening in a distal direction for a clamping connection with a corresponding connection projection of a file shaft or prosthesis stem. An implant system according to any one of claims 1 to 3, characterized in that   The at least one trial joint head (12) includes a penetration portion (38) that forms a liquid flow path between the joint surface (14) and the connection receiving portion (18). The implant system according to claim 4.   From claim 1, characterized in that said at least one release recess (26a, 26b) comprises a release recess surface (32) facing away from said at least one trial joint head (12). The implant system according to claim 5.   The release recess surface (32) is curved concavely facing away from the at least one trial joint head (12) and / or the release recess surface (32) is hollow cylindrical. 7. Implant system according to claim 6, characterized in that it is formed in the form of a face piece (34).   The at least one release recess (26a, 26b) is formed symmetrically with respect to a symmetry plane (36) comprising a longitudinal axis (22) defined by the at least one trial joint head (12). The implant system according to any one of claims 1 to 7.   1 1 to 8 characterized in that the at least one release recess (26a, 26b) is formed in the form of a gripping recess (28) and / or in the form of a tool element receptacle (42). The implant system according to any one of the above.   The tool element receptacle (42) is opened to face in a direction radially away from the trial joint head (12) with respect to a longitudinal axis (22) defined by the at least one trial joint head (12). And / or the tool element receptacle (42) comprises two inner surfaces (46) extending parallel or substantially parallel to each other. Implant system.   The tool element receptacle (42) defines a stopper (48) acting in the proximal direction and / or one tool element receptacle (42) is assigned to each gripping recess (28). And / or the center length of the tool element receptacle (42) coincides with about half the center length of the gripping recess (28). Implant system according to 9 and 10.   Implant system according to any one of the preceding claims, characterized in that the at least one trial joint head (12) is made of plastic, in particular sterilizable plastic.   At least one release tool (16) with at least one release element (56) formed to correspond to or substantially correspond to the at least one release recess (26b). Item 13. The implant system according to any one of Items 1 to 12.   Said at least one release element (56) in friction connection and / or with said at least one release recess (26b), in particular with said at least one release recess (26b) in the form of a tool recess (42); Being formably engageable and / or wherein the at least one release tool (16) includes a handle (54), and wherein the at least one release element (56) is the handle (54). 14. Implant system according to claim 13, characterized in that it is arranged or formed at the distal end (62) or the distal end region (64).   The at least one release element (56) defines a release element longitudinal axis (80), the handle (54) defines a handle longitudinal axis (52), and the release element longitudinal axis The angle (82) formed between (80) and the handle longitudinal axis (30) is in the range from about 90 ° to about 180 °, according to claims 13 and 14 The described implant system.

Images