DE102012105070A1 - Artificial socket for joint implant at bone, has bone protruding engagement elements in introduction layer toward in direction of bone-facing outer side, and base body partially coating with osteointegrative coating at outer side - Google Patents

Abstract

The socket (10) has a cup-shaped base body with an edge and a pole (24) and comprising bone protruding engagement elements in an introduction layer toward a bone-facing outer side direction. The base body is partially coated with an osteointegrative coating (56) at an outer side. The coating comprises titanium and/or calcium phosphate. The base body is free of engagement elements at a pole area (42) extending over the pole. The engagement elements are differently configured depending on a position at the base body. An independent claim is also included for a method for manufacturing of an artificial socket of a joint implant.

Description

The invention relates to an artificial socket for a joint implant, wherein the socket comprises a shell-shaped basic body with an edge and a pole, and wherein the basic body has engagement elements projecting in the direction of the bone in an insertion position towards a bone.

Moreover, the invention relates to a method for producing an artificial socket of a joint implant.

An artificial cup of the type mentioned above, a cup implant can be used in a joint implant, especially in a hip joint endoprosthesis, which has a joint socket and a cooperating with this shaft prosthesis for the femur. During implantation, the acetabulum is positioned in an insertion position and inserted into a previously prepared bone while applying force to the pole, for example the acetabulum in the case of a hip joint prosthesis. At the outside facing the bone, the pan has engaging elements projecting from the base body. The engagement elements serve a tight fit of the pan in the bone and can intervene in this for this purpose. Such a seat is referred to as a "press fit" in which the engagement elements usually protrude beyond the nominal contour of the bone-adapted recess.

The socket can be a socket which, on its inner side facing away from the outer side, has a joint surface which cooperates with a correspondingly formed joint surface of a further implant component. It is also conceivable that the pan is an outer cup of an implant component, in whose space enclosed by the base body an inner socket is inserted and firmly connected to the outer cup. In this case, the inner socket may comprise the above-mentioned joint surface for cooperation with the correspondingly formed joint surface of the further implant component.

The pan defines a pole, wherein it can also be provided that the main body has an opening at the pole, for example for connection to an insertion tool for the pan.

Object of the present invention is to provide a generic pan that can be anchored to the bone in a better way.

This object is achieved in a pan of the aforementioned type according to the invention that the body is coated on the outside at least partially with an osteointegrative coating.

In the inventive pan, primary stability relative to the bone can be achieved by bringing the engagement elements into engagement with the bone so that an interference fit of the socket with the bone can be achieved. In addition, the pan has a coating on at least a portion of the outside. The coating is osteointegrative and allows secondary stability of the cup to be achieved relative to the bone. In this case, "osteointegrative" can be understood to mean, in particular, that the coating favors the growth of bone or bone material on the cup and, in particular, makes it easier for a cup with base body and engagement elements without coating. For this purpose, the coating, at least facing the bone, may preferably have a porous structure in order to form a large bone-facing surface. The enlarged surface facilitates the ingrowth of bone or bone material and thereby promotes the tight hold of the pan on the bone. In practice, it is found that the combination of a macrostructure formed by the engagement elements with the microstructure formed by the coating can ensure a particularly reliable seat of the socket on the bone. By "macrostructure" on the one hand and "microstructure" on the other hand, it can be understood here in particular that the roughness resulting from the engagement elements exceeds the roughness resulting from the coating on the outside.

The coating is preferably osteoconductive and capable of stimulating the growth of bone or bone material.

It proves to be advantageous if the base body is coated with the coating at least on a section of the outside provided with engagement elements. The primary stability achievable by the engagement elements can in this way be specifically supplemented by the coating covering them with a secondary stability.

It is favorable if the main body is coated on the outside completely or substantially completely with the coating in order to allow an even better anchoring of the pan to the bone.

Preferably, the coating comprises titanium and / or calcium phosphate or consists of titanium and / or calcium phosphate. It shows in the Practice that porous titanium and / or calcium phosphate coatings have an osteointegrative effect.

The layer can be applied, for example, using a plasma coating process on the base body, which will be discussed below.

The average thickness of the coating is, for example, about 200 μm to about 500 μm, preferably about 350 μm.

It can be provided in particular that the coating is formed in sections of different thickness. In the present case, "differently thick" refers to an average thickness of the coating, including its layer thickness variation due to a porosity. It can be provided that sections of the coating have the same or substantially the same porosity different average layer thicknesses.

It is favorable if the base body is free of engagement elements at a pole region extending over the pole. Engagement elements in the region of the pole or the region extending over the pole are usually of rather reduced importance for an interference fit on the bone. This embodiment therefore makes it possible to simplify the manufacture of the pan.

It may be provided, for example, that the base body, starting from the pole over an angle of about 30 ° to about 50 ° is free of engagement elements, with respect to a pole axis of an ellipsoid defined by the body. In the present case, this can be understood in particular to mean that the main body is free of engagement elements from the pole to the approximately 60th degree of latitude or up to the approximately 40th degree of latitude, relative to an ellipsoid defined by the basic body. For example, the main body can form a section of a sphere, in particular a hemisphere, or a section of an ellipsoid which, for example, is flattened at the pole with respect to a spherical contour. The ellipsoid, in particular the sphere, can be adapted to a coordinate system with an equator running at the edge or near the edge and a pole coinciding with the pole. From about 40 degrees latitude to the pole to about 60 degrees latitude to the pole, in the present embodiment, the body may have a pole portion that is free of engagement elements.

It is advantageous if engaging elements are arranged on the outer circumference of the main body. In the present case, this can be understood in particular to mean that engaging elements are arranged at a distance from the pole at the radial region. For example, at latitudes approximately less than the 60th parallel or less than the approximately 40th parallel, the body is provided with engagement elements. By arranged on the outer circumference engagement elements a high primary stability of the pan can be ensured on the bone.

Conveniently, the engagement elements extend to the edge or substantially to the edge. By arranged on the edge or near the edge engaging elements an interference fit of the pan with the bone at or near the edge is made possible.

It is advantageous if the engagement elements in several circumferential rows, each defining a plane perpendicular to a polar axis defined by the body, are arranged on the base body. The engagement elements could rotate around the outside with respect to the polar axis. Each row runs in a plane perpendicular to the pole axis, and thus, as it were, along a latitude of an ellipsoid defined by the body. Adjacent rows may have identical distances or different distances from each other. Within a row, the engagement elements are preferably configured identically.

It can be provided that circumferential grooves are formed on the base body between the rows.

It is advantageous if the engagement elements are arranged on the base body in a plurality of rows, each of which defines a plane containing a pole axis defined by the base body. The engagement elements may extend in each of the pole axis containing planes, as it were along the longitudinal circles of an ellipsoid defined by the body. In the circumferential direction of the pole axis, adjacent rows preferably have identical distances from one another.

The above statements show that the engagement elements can be arranged in particular in the manner of a mesh or grid structure on the outside.

It proves to be advantageous if the engagement elements are designed differently depending on their position on the base body.

For example, it can be provided that the height of the engagement elements with respect to the base body otherwise decreases with decreasing distance to the pole. In the present case, this can be understood in particular to mean that engagement elements project further from the base body, the greater their distance from the pole. The high of Engagement elements may decrease monotonically and / or continuously as the distance to the pole decreases.

Further, it is advantageous if the length of the engagement elements, relative to a direction from the edge to the pole, increases in the direction of the pole. In the present case, this can be understood in particular as meaning that the engagement elements cover a larger number of latitudes of an ellipsoid defined by the base body as the distance from the pole decreases. The length of the engagement elements may increase monotonically and / or continuously with their decreasing distance to the pole.

It proves to be advantageous if the engagement elements have a first side surface, which faces a plane defined by the edge, and a second side surface, which faces the bone. In the present case, this can be understood in particular to mean that the engagement elements have an upper side (second side surface) facing the viewer from the outside in the direction of looking at the outside and an underside facing away from the viewer (first side surface). The first and second side surfaces may be connected directly or indirectly with each other and angularly oriented relative to each other. The engagement elements may at least partially have first side surfaces which are aligned in a plane parallel to the plane defined by the edge and thus in a plane perpendicular to the pole axis. Incidentally, lines of intersection of the first and / or the second side surface with the base body are preferably aligned in a plane perpendicular to the pole axis and may run along a latitude of an ellipsoid defined by the base body.

It proves to be favorable if, based on a direction from the edge to the pole, the first side surface is shorter than the second side surface. As a result, it is possible, in particular, to form barb-shaped projections with the engagement elements in order to enable reliable anchoring of the socket to the bone.

It is advantageous if the coating on the first side surface is thinner than on the second side surface.

It can preferably be provided in particular that the engagement elements are at least partially coated so that the coating protrudes at the free ends on the coating on the first side surface in the direction of a plane defined by the edge and the engagement elements with coating applied thereto an undercut in the direction train across the plane. The engagement elements with a coating applied thereto make it possible to form an undercut in a manufacturing technology simple manner. For this purpose, for example, as in the last advantageous embodiment of the pan, the coating on the first side surface thinner than on the second side surface, so that in the region of the free ends of the engaging elements projecting in the direction of the plane defined by the edge bead-shaped overhang Coating is formed. The undercut allows a particularly reliable fit of the pan, taking advantage of the primary and secondary stability of the bone.

Preferably, the engagement elements do not form an undercut in the cross-plane direction, thereby simplifying the manufacture of the pan. In the direction transverse to the plane, which is defined by the edge, the engagement elements can be formed without undercuts. The undercut can be easily formed by the coating manufacturing technology.

An advantageous embodiment of the pan according to the invention comprises engagement elements, which are formed in a truncated pyramid, frustoconical or prismatic. The engagement elements may be formed starting from the base body tapering and free of tips and be flattened at the ends. The engagement members may include discrete, angled side surfaces, such as the aforementioned first and second side surfaces. The side surfaces can be planar.

As mentioned above, the invention also relates to a method for producing an artificial socket of a joint implant.

The object of the present invention is to provide such a method by which one of the pans mentioned above can be produced.

• – Bereitstellen eines schalenförmigen Grundkörpers mit einem Rand und einem Pol;
• – Ausbilden von vorspringenden Eingriffselementen an einer in Einsetzlage einem Knochen zugewandten Außenseite des Grundkörpers; und
• – Beschichten zumindest eines Abschnitts der Außenseite mit einer osteointegrativen Beschichtung.

This object is achieved by a method comprising the following method steps:

• - Providing a bowl-shaped body with an edge and a pole;
• - Forming of projecting engagement elements on a in insertion position a bone facing outside of the body; and
• Coating at least a portion of the outside with an osteointegrative coating.

It is advantageous if a plasma coating method is used for the coating. For example, the main body is introduced into a reaction space in which a plasma is ignited. The one or more coating materials may be evaporated in the reaction space or introduced there using a carrier gas.

The material used for the coating is preferably titanium and / or calcium phosphate.

Especially when calcium phosphate is used for the coating, it can be provided that a different coating method is used than a plasma coating method. For example, a calcium phosphate coating can be applied using an electrolytic coating process.

It can be provided that the base body is coated with more than one coating. It is conceivable, for example, to coat the main body with a first coating comprising titanium and to apply a second coating comprising calcium phosphate to this first coating.

Advantageously, the base body is coated at least on a provided with engaging elements portion of the outside.

The main body may conveniently be completely or substantially completely coated on the outside.

It proves to be advantageous if the outside is coated in sections of different thickness.

The engagement elements are preferably formed by an abrasive manufacturing process, in particular by turning and / or by milling of the base body.

At an extending over the pole pole region of the body advantageously no engagement elements are formed, for example, starting from the pole over an angle of about 30 ° to about 50 °, with respect to a pole axis of an ellipsoid defined by the body. The main body can be formed free of engagement elements from the pole to about 60 degrees latitude or up to about 40 degrees latitude, based on an ellipsoid defined by the body.

Preferably, engagement elements are formed on the outer circumference of the main body, preferably up to the edge or substantially to the edge.

The engagement elements can be formed in a plurality of circumferential rows, each of which defines a plane perpendicular to a pole axis defined by the base body. Between the rows can, for example by turning, circumferential grooves are formed on the body.

Furthermore, the engagement elements can be formed on the base body in a plurality of rows, each of which defines a plane containing a pole axis defined by the base body. For example, the rows are formed by milling the body from the pole to the edge and / or vice versa.

Advantageously, the engagement elements are formed so that they are designed differently depending on their position on the base body, preferably that the height of the engagement elements with respect to the base body otherwise decreases with decreasing distance to the pole.

The length of the engagement elements, relative to a direction from the edge to the pole, may increase in the direction of the pole.

It is advantageous if the engagement elements are formed with a first side surface which faces a plane defined by the edge, and a second side surface which faces the bone.

Preferably, the first side surface is formed shorter than the second side surface with respect to a direction from the edge to the pole.

It proves to be favorable if the engagement elements are coated on the first side surface with a thinner coating than on the second side surface.

In particular, it is favorable if the engagement elements are at least partially coated such that the coating projects beyond the coating on the first side surface in the direction of a plane defined by the edge at the free ends of the engagement elements and the engagement elements with the coating applied thereto form an undercut in the direction train across the plane.

Advantageously, the engagement elements are made so that they (uncoated) do not form an undercut in the direction transverse to the plane.

The engagement elements can be formed in particular truncated pyramidal, frusto-conical or prismatic.

• 1. Künstliche Pfanne für ein Gelenkimplantat, wobei die Pfanne (10) einen schalenförmigen Grundkörper (12) umfasst mit einem Rand (20) und einem Pol (24), und wobei der Grundkörper (12) an einer in Einsetzlage einem Knochen zugewandten Außenseite (14) in Richtung des Knochens vorspringende Eingriffselemente (36) aufweist, dadurch gekennzeichnet, dass der Grundkörper (12) an der Außenseite (14) zumindest abschnittsweise mit einer osteointegrativen Beschichtung (56) beschichtet ist.
• 2. Pfanne nach Satz 1, dadurch gekennzeichnet, dass der Grundkörper (12) zumindest an einem mit Eingriffselementen (36) versehenen Abschnitt der Außenseite (14) mit der Beschichtung (56) beschichtet ist.
• 3. Pfanne nach Satz 1 oder 2, dadurch gekennzeichnet, dass der Grundkörper (12) an der Außenseite (14) vollständig oder im Wesentlichen vollständig mit der Beschichtung (56) überzogen ist.
• 4. Pfanne nach einem der voranstehenden Sätze, dadurch gekennzeichnet, dass die Beschichtung (56) Titan und/oder Calciumphosphat umfasst oder daraus besteht.
• 5. Pfanne nach einem der voranstehenden Sätze, dadurch gekennzeichnet, dass die Beschichtung (56) abschnittsweise unterschiedlich dick ausgebildet ist.
• 6. Pfanne nach einem der voranstehenden Sätze, dadurch gekennzeichnet, dass der Grundkörper (12) an einem sich über den Pol (24) erstreckenden Polbereich (42) frei von Eingriffselementen (36) ist.
• 7. Pfanne nach Satz 6, dadurch gekennzeichnet, dass der Grundkörper ausgehend vom Pol (24) über einen Winkel von ungefähr 30° bis ungefähr 50° frei von Eingriffselementen (36) ist, bezüglich einer Polachse (34) eines vom Grundkörper (12) definierten Ellipsoids.
• 8. Pfanne nach einem der voranstehenden Sätze, dadurch gekennzeichnet, dass am Außenumfang des Grundkörpers (12) Eingriffselemente (36) angeordnet sind.
• 9. Pfanne nach einem der voranstehenden Sätze, dadurch gekennzeichnet, dass sich die Eingriffselemente (36) bis zum Rand (20) oder im Wesentlichen bis zum Rand (20) erstrecken.
• 10. Pfanne nach einem der voranstehenden Sätze, dadurch gekennzeichnet, dass die Eingriffselemente (36) in mehreren umlaufenden Reihen (38), die jeweils eine Ebene senkrecht zu einer vom Grundkörper (12) definierten Polachse (34) definieren, am Grundkörper (12) angeordnet sind.
• 11. Pfanne nach Satz 10, dadurch gekennzeichnet, dass zwischen den Reihen (38) umlaufende Nuten (44) am Grundkörper (12) gebildet sind.
• 12. Pfanne nach einem der voranstehenden Sätze, dadurch gekennzeichnet, dass die Eingriffselemente (36) in mehreren Reihen (46), die jeweils eine vom Grundkörper (12) definierte Polachse (34) enthaltende Ebene definieren, am Grundkörper (12) angeordnet sind.
• 13. Pfanne nach einem der voranstehenden Sätze, dadurch gekennzeichnet, dass die Eingriffselemente (36) abhängig von deren Position am Grundkörper (12) unterschiedlich ausgestaltet sind.
• 14. Pfanne nach Satz 13, dadurch gekennzeichnet, dass die Höhe der Eingriffselemente (36) bezüglich des Grundkörpers (12) im Übrigen mit abnehmendem Abstand zum Pol (24) abnimmt.
• 15. Pfanne nach Satz 13 oder 14, dadurch gekennzeichnet, dass die Länge der Eingriffselemente (36), bezogen auf eine Richtung vom Rand (20) zum Pol (24), in Richtung des Poles (24) zunimmt.
• 16. Pfanne nach einem der voranstehenden Sätze, dadurch gekennzeichnet, dass die Eingriffselemente (36) eine erste Seitenfläche (48) aufweisen, die einer vom Rand (20) definierten Ebene (32) zugewandt ist, und eine zweite Seitenfläche (50), die dem Knochen zugewandt ist.
• 17. Pfanne nach Satz 16, dadurch gekennzeichnet, dass, bezogen auf eine Richtung von Rand (20) zum Pol (24), die erste Seitenfläche (48) kürzer ist als die zweite Seitenfläche (50).
• 18. Pfanne nach Satz 16 oder 17, dadurch gekennzeichnet, dass die Beschichtung (56) auf der ersten Seitenfläche (48) dünner ist als auf der zweiten Seitenfläche (50).
• 19. Pfanne nach einem der Sätze 16 bis 18, dadurch gekennzeichnet, dass die Eingriffselemente (36) zumindest teilweise so beschichtet sind, dass die Beschichtung (56) an deren freien Enden über die Beschichtung (56) an der ersten Seitenfläche (48) in Richtung einer vom Rand (20) definierten Ebene (32) hinausragt und die Eingriffselemente (36) mit darauf aufgebrachter Beschichtung (56) eine Hinterschneidung (58) in Richtung quer zur Ebene (32) ausbilden.
• 20. Pfanne nach Satz 19, dadurch gekennzeichnet, dass die Eingriffselemente (36) keine Hinterschneidung (58) in der Richtung quer zur Ebene (32) ausbilden.
• 21. Pfanne nach einem der voranstehenden Sätze, dadurch gekennzeichnet, dass die Eingriffselemente (36) pyramidenstumpfförmig, kegelstumpfförmig oder prismatisch ausgebildet sind.
• 22. Verfahren zur Herstellung einer künstlichen Pfanne eines Gelenkimplantates, umfassend die folgenden Verfahrensschritte: – Bereitstellen eines schalenförmigen Grundkörpers mit einem Rand und einem Pol; – Ausbilden von vorspringenden Eingriffselementen an einer in Einsetzlage einem Knochen zugewandten Außenseite des Grundkörpers; und – Beschichten zumindest eines des Abschnitts der Außenseite mit einer osteointegrativen Beschichtung.
• 23. Verfahren nach Satz 22, dadurch gekennzeichnet, dass zur Beschichtung in einem Plasmabeschichtungsverfahren verwendet wird.
• 24. Verfahren nach Satz 22 oder 23, dadurch gekennzeichnet, dass als Material für die Beschichtung Titan und/oder Calciumphosphat verwendet wird.
• 25. Verfahren nach einem der Sätze 22 bis 24, dadurch gekennzeichnet, dass der Grundkörper zumindest an einem mit Eingriffselementen versehenen Abschnitt der Außenseite beschichtet wird.
• 26. Verfahren nach einem der Sätze 22 bis 25, dadurch gekennzeichnet, dass der Grundkörper an der Außenseite vollständig oder im Wesentlichen vollständig beschichtet wird.
• 27. Verfahren nach einem der Sätze 22 bis 26, dadurch gekennzeichnet, dass die Außenseite abschnittsweise unterschiedlich dick beschichtet wird.
• 28. Verfahren nach einem der Sätze 22 bis 27, dadurch gekennzeichnet, dass die Eingriffselemente durch Drehen und/oder Fräsen des Grundkörpers gebildet werden.
• 29. Verfahren nach einem der Sätze 22 bis 28, dadurch gekennzeichnet, dass an einem sich über den Pol erstreckenden Polbereich des Grundkörpers keine Eingriffselemente ausgebildet werden.
• 30. Verfahren nach einem der Sätze 22 bis 29, dadurch gekennzeichnet, dass am Außenumfang des Grundkörpers Eingriffselemente ausgebildet werden, vorzugsweise bis zum Rand oder im Wesentlichen bis zum Rand.
• 31. Verfahren nach einem der Sätze 22 bis 30, dadurch gekennzeichnet, dass die Eingriffselemente so ausgebildet werden, dass sie abhängig von deren Position am Grundkörper unterschiedlich ausgestaltet sind, vorzugsweise dass die Höhe der Eingriffselemente bezüglich des Grundkörpers im Übrigen mit abnehmendem Abstand der Eingriffselemente zum Pol abnehmend ausgebildet wird.
• 32. Verfahren nach einem der Sätze 22 bis 31, dadurch gekennzeichnet, dass die Eingriffselemente mit einer ersten Seitenfläche ausgebildet werden, die einer vom Rand definierten Ebene zugewandt ist, und einer zweite Seitenfläche, die dem Knochen zugewandt ist.
• 33. Verfahren nach Satz 32, dadurch gekennzeichnet, dass die Eingriffselemente auf der ersten Seitenfläche mit einer dünneren Beschichtung überzogen werden als auf der zweiten Seitenfläche.
• 34. Verfahren nach Satz 32 oder 33, dadurch gekennzeichnet, dass die dass die Eingriffselemente zumindest teilweise so beschichtet werden, dass die Beschichtung an den freien Enden der Eingriffselemente über die Beschichtung an der ersten Seitenfläche in Richtung einer vom Rand definierten Ebene hinausragt und die Eingriffselemente mit darauf angebrachter Beschichtung eine Hinterschneidung in der Richtung quer zur Ebene ausbilden.

The above description therefore comprises in particular the exemplary embodiments of an artificial pan or a method for producing an artificial pan, which are defined below in the form of numbered sets:

• 1. Artificial pan for a joint implant, wherein the pan ( 10 ) a bowl-shaped base body ( 12 ) includes an edge ( 20 ) and a pole ( 24 ), and wherein the basic body ( 12 ) on a side facing in insertion position a bone ( 14 ) in the direction of the bone projecting engagement elements ( 36 ), characterized in that the basic body ( 12 ) on the outside ( 14 ) at least in sections with an osteointegrative coating ( 56 ) is coated.
• 2. pan according to sentence 1, characterized in that the basic body ( 12 ) at least at one with engaging elements ( 36 ) provided portion of the outside ( 14 ) with the coating ( 56 ) is coated.
• 3. pan according to sentence 1 or 2, characterized in that the basic body ( 12 ) on the outside ( 14 ) completely or substantially completely with the coating ( 56 ) is coated.
• 4. Pan according to one of the preceding sentences, characterized in that the coating ( 56 ) Comprises or consists of titanium and / or calcium phosphate.
• 5. Pan according to one of the preceding sentences, characterized in that the coating ( 56 ) is formed differently thick sections.
• 6. pan according to one of the preceding sentences, characterized in that the basic body ( 12 ) at one over the pole ( 24 ) extending pole region ( 42 ) free of engaging elements ( 36 ).
• 7. pan according to sentence 6, characterized in that the basic body starting from the pole ( 24 ) at an angle of about 30 ° to about 50 ° free of engagement elements ( 36 ), with respect to a polar axis ( 34 ) one of the main body ( 12 ) defined ellipsoids.
• 8. pan according to one of the preceding sentences, characterized in that on the outer circumference of the base body ( 12 ) Engaging elements ( 36 ) are arranged.
• 9. pan according to one of the preceding sentences, characterized in that the engagement elements ( 36 ) to the edge ( 20 ) or essentially to the edge ( 20 ).
• 10. Pan according to one of the preceding sentences, characterized in that the engagement elements ( 36 ) in several circumferential rows ( 38 ), each one plane perpendicular to one of the main body ( 12 ) defined polar axis ( 34 ), at the base body ( 12 ) are arranged.
• 11. pan according to sentence 10, characterized in that between the rows ( 38 ) circumferential grooves ( 44 ) on the base body ( 12 ) are formed.
• 12. Cup according to one of the preceding sentences, characterized in that the engagement elements ( 36 ) in several rows ( 46 ), one each from the main body ( 12 ) defined polar axis ( 34 ) define a level at the base body ( 12 ) are arranged.
• 13. Pan according to one of the preceding sentences, characterized in that the engagement elements ( 36 ) depending on their position on the base body ( 12 ) are designed differently.
• 14. pan according to sentence 13, characterized in that the height of the engagement elements ( 36 ) with respect to the basic body ( 12 ) with decreasing distance to the pole ( 24 ) decreases.
• 15. pan according to sentence 13 or 14, characterized in that the length of the engagement elements ( 36 ), relative to a direction from the edge ( 20 ) to the pole ( 24 ), in the direction of the pole ( 24 ) increases.
• 16. Pan according to one of the preceding sentences, characterized in that the engagement elements ( 36 ) a first side surface ( 48 ), one of the edges ( 20 ) defined level ( 32 ) and a second side surface (FIG. 50 ) facing the bone.
• 17. Pan according to sentence 16, characterized in that, based on a direction of edge ( 20 ) to the pole ( 24 ), the first side surface ( 48 ) is shorter than the second side surface ( 50 ).
• 18. Pan according to sentence 16 or 17, characterized in that the coating ( 56 ) on the first side surface ( 48 ) is thinner than on the second side surface ( 50 ).
• 19. Pan according to one of the sentences 16 to 18, characterized in that the engagement elements ( 36 ) are at least partially coated so that the coating ( 56 ) at the free ends of the coating ( 56 ) on the first side surface ( 48 ) in the direction of one from the edge ( 20 ) defined level ( 32 protrudes) and the engagement elements ( 36 ) with a coating applied thereto ( 56 ) an undercut ( 58 ) in the direction transverse to the plane ( 32 ) train.
• 20. pan according to sentence 19, characterized in that the engagement elements ( 36 ) no undercut ( 58 ) in the direction transverse to the plane ( 32 ) train.
• 21. Pan according to one of the preceding sentences, characterized in that the engagement elements ( 36 ) are truncated pyramidal, frusto-conical or prismatic.
• 22. A method for producing an artificial socket of a joint implant, comprising the following method steps: - providing a shell-shaped base body with an edge and a pole; - Forming of projecting engagement elements on a in insertion position a bone facing outside of the body; and coating at least one of the portion of the outside with an osteointegrative coating.
• 23. Method according to sentence 22, characterized in that it is used for coating in a plasma coating process.
• 24. Method according to sentence 22 or 23, characterized in that the material used for the coating is titanium and / or calcium phosphate.
• 25. The method according to any one of sentences 22 to 24, characterized in that the base body is coated at least on a provided with engaging elements portion of the outside.
• 26. The method according to any one of sentences 22 to 25, characterized in that the main body is completely or substantially completely coated on the outside.
• 27. The method according to any one of sentences 22 to 26, characterized in that the outside is coated in sections of different thickness.
• 28. The method according to any one of sentences 22 to 27, characterized in that the engagement elements are formed by turning and / or milling of the base body.
• 29. Method according to one of the sentences 22 to 28, characterized in that no engagement elements are formed on a pole region of the base body extending over the pole.
• 30. The method according to any one of sentences 22 to 29, characterized in that on the outer circumference of the main body engaging elements are formed, preferably to the edge or substantially to the edge.
• 31. The method according to any one of sentences 22 to 30, characterized in that the engagement elements are formed so that they are designed differently depending on their position on the base body, preferably that the height of the engagement elements with respect to the body by the way with decreasing distance of the engagement elements Pol decreasing is formed.
• 32. The method according to any one of sentences 22 to 31, characterized in that the engagement elements are formed with a first side surface which faces a plane defined by the edge, and a second side surface which faces the bone.
• 33. The method according to sentence 32, characterized in that the engagement elements are coated on the first side surface with a thinner coating than on the second side surface.
• 34. The method according to sentence 32 or 33, characterized in that that the engagement elements are at least partially coated so that the coating protrudes at the free ends of the engagement elements on the coating on the first side surface in the direction of a plane defined by the edge and the engagement elements with the coating applied to it, form an undercut in the direction transverse to the plane.

The following description of preferred embodiments of the invention is used in conjunction with the drawings for further explanation of the invention. Show it:

1 a perspective view of a first preferred embodiment of a pan according to the invention, comprising a base body and a coating applied thereto;

2 : a perspective view of the main body of the pan 1 ;

3 : a section-wise side view of the main body 2 ;

4 : a sectional longitudinal view of the pan off 1 and

5 : an enlarged view of detail A in 4 ,

1 shows in perspective an implant in the form of a preferred embodiment of a reference numeral 10 occupied artificial pan. At the pan 10 it is an external socket of a hip component of a hip joint. The pan 10 can be firmly connected to an inner socket of the hip component, not shown in the drawing. The inner socket can comprise a joint surface which cooperates with a correspondingly formed joint surface of a femoral component of a hip joint.

The pan comprises a bowl-shaped body 12 in the form of a hollow calotte, which has an outside 14 and an inside 16 having. The outside 14 is in a position of insertion of the pan 10 facing a bone, not shown in the drawing, in which the pan 10 anchored. Before inserting the pan 10 the bone (the acetabulum in the case of a hip socket) is adapted to a recess with a usually spherical contour, which in 5 through a solid line 18 is symbolized.

The main body 12 defines an ellipsoid and has an edge 20 which is arranged on the proximal side and an insertion opening 22 for insertion of the inner socket, not shown. The border is approximately at the equator of the ellipsoid or defines it. Defined on the distal side of the main body 12 a pole 24 , in which in the present case an opening 26 is formed. At the perforation 26 is a connection device 28 arranged over which a not shown in the drawing insertion tool with the pan 10 can be connected. The opening 26 is by means of a closure element 30 closable.

The edge 20 defines a level 32 , perpendicular to the one polar axis 34 of the basic body 12 is aligned. The main body 12 defines an ellipsoid, which can be a spherical ellipsoid. In the present case, however, the basic body defines 12 one along the pole axis 34 compressed ellipsoid, which is especially in 5 by comparison with the spherical contour 18 is recognizable. To the pole 24 around is the main body 12 compressed and thus flattened.

The main body 12 has a plurality of engagement elements 36 to intervene in the bone, from the outside 14 stick out in the direction of the bone. The engaging elements 36 are in rows 38 arranged, each one plane perpendicular to the polar axis 34 define. Within a row 38 revolve around the same engaging elements 36 the entire outside 14 , There are eleven rows in total 38 available. Proximalseitig is a first row 38 near the edge 20 arranged. Distal side is a row 38 approximately in the area of 40 , to 50 , Latitude of the body 12 defined ellipsoids arranged.

Neighboring rows 38 each have approximately the same distance from each other and extend over several degrees of latitude of the ellipsoid. The engaging elements 36 in the six, the edge 20 facing rows 38 cover about the same number of latitudes. engaging members 36 in the five, the pole 24 facing rows 38 On the other hand, they are slightly longer in terms of the direction from the edge 20 to the pole 24 , Accordingly, the spacing of the rows increases 38 from each other in the direction of the pole 24 at. In addition, the length of the engagement elements increases 36 , relative to the direction from the edge 20 to the pole 24 , in the direction of the pole 24 at.

At the edge 20 itself, a circumferential bead 40 training, are not engaging elements 36 arranged. The bead 40 can serve for holding and making the pan 10 facilitate. In addition, the bead can 40 are overlapped, for example, when inserting the pan 10 or during a revision with an insertion or a release tool. It is also conceivable that an inner pan the bead 40 overlaps.

Furthermore, there are no engagement elements 36 at the base body 12 arranged in a way over the pole 24 extending pole region 42 , The pole area 42 extends from the pole 24 until about to 40 , to 50 , Latitude of the body 12 defined ellipsoids. About an angle with respect to the polar axis 34 from about 40 ° to about 50 ° is the main body 12 free of engagement elements 36 ,

Between adjacent rows 38 are at the base body 12 circumferential grooves 44 formed in planes each perpendicular to the polar axis 34 ,

The engaging elements 36 are also in rows 46 on the outside 14 arranged, each one the pole axis 34 define containing level. Accordingly, the engagement elements extend 36 in the rows 46 along longitudes of the body 12 defined ellipsoids. Overall, about 60 until about 80 string 46 present, each extending over a few degrees of longitude, the rows 46 each equidistant to each other on the body 12 are arranged.

As the above description shows, the engagement elements are 36 on the outside 14 arranged in a mesh or lattice-like structure, wherein the pole region 42 and the bead 40 free of engagement elements 36 are.

The engaging elements 36 have an approximately frusto-conical shape in the "lower", ie the edge 20 facing six rows 38 , In the "upper", ie the pole 24 facing rows have the engagement elements 36 a rather prismatic, wedge-shaped structure. The height of the engagement elements 36 falls with decreasing distance from the pole 24 from. This can be understood in particular that the engagement elements 36 from the main body 12 Incidentally, the further the distance, the greater the distance from the pole 24 is. The longest engagement elements are, as mentioned, in the top row 38 present, which in plan view on the outside 14 have an approximately rectangular structure.

The engaging elements 36 each have a first side surface 48 on, the level 32 facing, and a second side surface 50 which faces the bone. The side surfaces 48 and 50 define each cut lines with planes perpendicular to the polar axis 34 , In particular, the first side surfaces 48 the bottom six rows 38 in planes or essentially in planes perpendicular to the polar axis 34 arranged. In the five upper rows 38 the first side surfaces are substantially formed by lateral walls of the circumferential grooves 44 ,

The second side surfaces 50 are apart from the engaging elements 36 in the top row 38 , formed angled. The engaging elements 36 The lower ten rows are thereby flattened at their free ends and free of peaks.

Furthermore, the engagement elements 36 at their base, about which they are with the main body 12 Incidentally, they are wider than at their free ends. Starting from their free ends, they have flared side surfaces 52 and 54 on, relative to those of the ranks 46 defined levels are inclined ( 3 ).

The engaging elements 36 serve a primary stability of the pan 10 to achieve anchoring in the bone. Usually, the bone is with the contour 18 prepared so that the engaging elements 36 with their free ends over the contour 18 out in the direction of the bone. This means that the pan 10 is chosen so that they are an excess with respect to the contour 18 has in the region of the engagement elements 36 , When inserting the pan 10 grab the engaging elements 36 into the bone, leaving the pan 10 due to the oversize is anchored by a press fit in the bone.

It proves to be advantageous that the engagement elements 36 on the outer circumference of the pan 10 to near the edge 20 are arranged. The approximately rectangular in plan view engagement elements 36 the top row 38 Serve as guiding elements that facilitate the insertion of the pan 10 relieve in the bones. As advantageous for easier insertion of the pan 10 in the bones also proves that the height of the engaging elements 36 with decreasing distance from the pole 24 decreases.

The through the engagement elements 36 caused primary stability in the anchoring of the pan 10 is complemented by a secondary stability through a coating 56 the outside 14 is ensured. The coating 56 extends substantially over the entire outside 14 , The only thing left out is the bead 40 on the edge 20 , The closure element 30 can also be a coating 56 exhibit. In the event that the main body 12 at the pole 24 no breakthrough 26 includes, the coating extends 56 preferably over the entire pole 24 ,

When coating 56 it is an osteointegrative coating, which, not shown in detail in the drawing, has a high porosity on its side facing the bone. Due to the high porosity, a large surface is formed facing the bone. This promotes the growth of bone or bone material on the coating 56 and with the pan 10 , The secondary stability achievable thereby supplements that achieved by the engagement elements 36 achievable primary stability and ensures a particularly reliable fit of the pan 10 on the bone.

The coating 56 is applied, for example, by a plasma coating method. In this process, the main body 12 with engaging elements formed thereon 36 be introduced into a reaction space in which a low-pressure gas is present. In the gas, for example argon, a plasma can be ignited under whose action the coating 56 on the body 12 reflected. The coating material, for example titanium and / or calcium phosphate, can be vaporized in the reaction space or introduced into the reaction space by means of a carrier gas.

It can also be provided that the coating 56 more than one layer comprises, for example, the base body 12 facing "lower" Titanlage and a bone facing "upper" layer of calcium phosphate.

The coating 56 has an average thickness of about 200 μm to about 500 μm, for example about 350 μm.

In particular, the coating has 56 different layer thicknesses. In the present case, "different layer thicknesses" can be understood in particular to mean that the average thickness of the coating 56 varies, but their porosity is identical or substantially identical in sections of different thickness.

The porosity of the coating 56 In particular, it may be about 25% to about 50%, measured as the ratio of in the coating 56 existing holes to a solid material.

In the 4 and 5 In particular, it can be seen that the thickness of the coating 56 on the second side surface 50 thicker than on the first side surface 48 while the porosity is essentially the same. This applies in the present case, at least for the lower eight rows 38 of engagement elements 36 , In at least these ranks 38 is the coating 56 on the engaging elements 36 so formed that the coating 56 formed at the free ends of a bead-shaped overhang and the coating 56 on the first side surfaces 48 protrudes, in the direction of the plane 32 , The engaging elements 36 with coating applied thereto 56 have thereby an approximately fin-shaped in an axial sectional view.

Through at the free ends in the direction of the plane 32 excellent coating 56 becomes an undercut 58 formed in a direction transverse to the plane 32 , The undercut 58 can be due to the coating 56 form manufacturing technology, so that a mechanical production of undercuts on the engagement elements 36 even to simplify the manufacture of the pan 10 can be omitted. The undercut 58 allows a particularly reliable fit of the pan 10 in the bone, taking advantage of the primary stability of the engaging elements 36 and the supporting secondary stability through the coating 56 ,

As mentioned, the invention also relates to a method of manufacturing the pan 10 , In the production of the pan 10 a basic body, for example made of titanium, can be provided, from which the basic body 12 can be made by turning and / or milling. For example, the base body is machined in an initial state by turning, with the inside 16 and the outside 14 , except the engaging elements 36 to be formed. The grooves 44 can by turning on the outside 14 be formed.

In a subsequent machining process, the engagement elements 36 be prepared in particular by milling the body. For example, at least one milling tool is provided which, starting from the pole 24 in the direction of the edge 20 and / or vice versa on the outside 14 emotional. In particular, two milling tools can be provided, the opposite of the pole 24 to the edge 20 and vice versa. By milling, the engagement elements 36 in the form shown in the drawing and therefore the main body 12 to get finished.

In a subsequent manufacturing step, the coating 56 on the outside 14 be applied, for example, using the above-mentioned plasma coating method. In the present form of engagement elements 36 this results in the aforementioned difference in thickness of the coating 56 on the first side surfaces 48 and the second side surfaces 50 and the bead-shaped overlap of the coating 56 at the free ends of the engagement elements 36 in the direction of the plane 32 for the formation of the undercut 58 in a technically simple manner.

Claims (25)

Artificial pan for a joint implant, wherein the pan ( 10 ) a bowl-shaped base body ( 12 ) includes an edge ( 20 ) and a pole ( 24 ), and wherein the basic body ( 12 ) on a side facing in insertion position a bone ( 14 ) in the direction of the bone projecting engagement elements ( 36 ), characterized in that the basic body ( 12 ) on the outside ( 14 ) at least in sections with an osteointegrative coating ( 56 ) is coated. Pan according to claim 1, characterized in that the basic body ( 12 ) at least at one with engaging elements ( 36 ) provided portion of the outside ( 14 ) with the coating ( 56 ) is coated. Pan according to claim 1 or 2, characterized in that the basic body ( 12 ) on the outside ( 14 ) completely or substantially completely with the coating ( 56 ) is coated. Ladle according to one of the preceding claims, characterized in that the coating ( 56 ) Comprises or consists of titanium and / or calcium phosphate. Ladle according to one of the preceding claims, characterized in that the coating ( 56 ) is formed differently thick sections. Pan according to one of the preceding claims, characterized in that the basic body ( 12 ) at one over the pole ( 24 ) extending pole region ( 42 ) free of engaging elements ( 36 ). Pan according to claim 6, characterized in that the basic body starting from the pole ( 24 ) at an angle of about 30 ° to about 50 ° free of engagement elements ( 36 ), with respect to a polar axis ( 34 ) one of the main body ( 12 ) defined ellipsoids. Pan according to one of the preceding claims, characterized in that the engagement elements ( 36 ) to the edge ( 20 ) or essentially to the edge ( 20 ). Pan according to one of the preceding claims, characterized in that the engagement elements ( 36 ) in several circumferential rows ( 38 ), each one plane perpendicular to one of the main body ( 12 ) defined polar axis ( 34 ), at the base body ( 12 ) are arranged. Pan according to one of the preceding claims, characterized in that the engagement elements ( 36 ) in several rows ( 46 ), one each from the main body ( 12 ) defined polar axis ( 34 ) define a level at the base body ( 12 ) are arranged. Pan according to one of the preceding claims, characterized in that the engagement elements ( 36 ) depending on their position on the base body ( 12 ) are designed differently. Pan according to claim 11, characterized in that the height of the engaging elements ( 36 ) with respect to the basic body ( 12 ) with decreasing distance to the pole ( 24 ) decreases. Pan according to one of the preceding claims, characterized in that the engagement elements ( 36 ) a first side surface ( 48 ), one of the edges ( 20 ) defined level ( 32 ) and a second side surface (FIG. 50 ), which faces the bone, preferably that, relative to a direction of edge ( 20 ) to the pole ( 24 ), the first side surface ( 48 ) is shorter than the second side surface ( 50 ). Pan according to one of the preceding claims, characterized in that the engagement elements ( 36 ) are truncated pyramidal, frusto-conical or prismatic. Method for producing an artificial socket of a joint implant, comprising the following method steps: - Providing a bowl-shaped body with an edge and a pole; - Forming of projecting engagement elements on a in insertion position a bone facing outside of the body; and Coating at least one of the portion of the outside with an osteointegrative coating. A method according to claim 15, characterized in that it is used for coating in a plasma coating process. A method according to claim 15 or 16, characterized in that titanium and / or calcium phosphate is used as the material for the coating. Method according to one of claims 15 to 17, characterized in that the base body is coated at least on a provided with engaging elements portion of the outside. Method according to one of claims 15 to 18, characterized in that the main body is completely or substantially completely coated on the outside. Method according to one of claims 15 to 19, characterized in that the outside is coated in sections of different thickness. Method according to one of claims 15 to 20, characterized in that the engagement elements are formed by turning and / or milling of the base body. Method according to one of claims 15 to 21, characterized in that no engagement elements are formed on a pole region of the base body extending over the pole. Method according to one of claims 15 to 22, characterized in that on the outer circumference of the main body engaging elements are formed, preferably to the edge or substantially to the edge. Method according to one of claims 15 to 23, characterized in that the engagement elements are formed so that they are designed differently depending on their position on the base body, preferably that the height of the engagement elements with respect to the base body by the way with decreasing distance of the engagement elements to the pole decreasing is trained. Method according to one of claims 15 to 24, characterized in that the engagement elements are formed with a first side surface, which faces a plane defined by the edge, and a second side surface, which faces the bone, preferably that the first side surface is formed shorter than the second side surface, referring to a direction from the edge to the pole.

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