Abstract: A shell (1) for a prosthetic joint to be driven into a bone substance. The shell having an outer lateral surface (4) which is convexly curved in cross section and on which a plurality of ribs (5) is arranged. All ribs extend in the same direction at a preferably increasing gradient angle of 45° to 85° at the equatorial end (6) to a pole-side end (7). The cumulative flank projection area of all ribs (5) corresponds to at least a fifth of the entire outer lateral surface. As a result of this measure, a very high primary stability is achieved once the shell has been driven in, the shell being screwed into the bone substance very precisely and without bone material being sheared off. This arrangement can also be applied, similarly, to a concavely curved inner lateral surface.

Abstract: A shell (1) for a prosthetic joint to be driven into a bone substance. The shell having an outer lateral surface (4) which is convexly curved in cross section and on which a plurality of ribs (5) is arranged. All ribs extend in the same direction at a preferably increasing gradient angle of 45° to 85° at the equatorial end (6) to a pole-side end (7). The cumulative flank projection area of all ribs (5) corresponds to at least a fifth of the entire outer lateral surface. As a result of this measure, a very high primary stability is achieved once the shell has been driven in, the shell being screwed into the bone substance very precisely and without bone material being sheared off. This arrangement can also be applied, similarly, to a concavely curved inner lateral surface.

Abstract: A shell (1) for a prosthetic joint to be driven into a bone substance. The shell having an outer lateral surface (4) which is convexly curved in cross section and on which a plurality of ribs (5) is arranged. All ribs extend in the same direction at a preferably increasing gradient angle of 45° to 85° at the equatorial end (6) to a pole-side end (7). The cumulative flank projection area of all ribs (5) corresponds to at least a fifth of the entire outer lateral surface. As a result of this measure, a very high primary stability is achieved once the shell has been driven in, the shell being screwed into the bone substance very precisely and without bone material being sheared off. This arrangement can also be applied, similarly, to a concavely curved inner lateral surface.

Abstract: An outer shell (1) for a joint socket implant, in particular for an acetabular implant, which comprises a convex outer face (3) and a concave inner face (4) for receiving an inner shell. The concave inner face (4) has at least partially a toothing system (7), in particular a circular circumferential region (6) thereof. Via the toothing system (7), an inhibition of the rotatability of the two shells, relative to one another, can be achieved upon insertion of the inner shell into the outer shell (1).

Abstract: An outer shell (1) for a joint socket implant, in particular for an acetabular implant, which comprises a convex outer face (3) and a concave inner face (4) for receiving an inner shell. The concave inner face (4) has at least partially a toothing system (7), in particular a circular circumferential region (6) thereof. Via the toothing system (7), an inhibition of the rotatability of the two shells, relative to one another, can be achieved upon insertion of the inner shell into the outer shell (1).

Abstract: An implant (1), in particular an acetabular implant, for implantation into a bone has, at least in parts, a surface structure (2) of raised portions (3) and depressions (4). The depressions (4) have zones coated with a porous coating (5). The raised portions are either not coated at all or are coated such that the coating has a thin layer thickness or a higher abrasion resistance in these portions. In this way, an improved abrasion behavior is reached when the implant is inserted into the bone.

Abstract: The instrument has a collet (19) that has at least two clamping jaws (18, 18?) for engaging an engaging means (4) on an implant body (1). The collet is received in a sleeve portion (20), the free end (21) of which has a support portion (22) that can be supported on the surface of the implant. A tension element (23) that engages the collet is used as an actuating means for actuating the collet. The outer faces of the clamping jaws interact with the inner face of the sleeve portion such that the collet can be closed and moved relative to the free end of the sleeve portion by pulling the tension element.

Abstract: The invention relates to a ball-and-socket implant (I), in particular an acetabular implant, preferably in the shape of a spherical cup shell, said implant having at least one region with a surface structure (2, 7). The at least one region extends between the equator and the pole of the spherical cup shell. The surface structure comprises a plurality of structural elements (6), each of which is formed by a plurality of intersecting ridges (3, 8) with opposite inclinations. The number of structural elements (6) on the equator (5) or on a circle of latitude near the equator is the same as on a circle of latitude near the pole. The ridges (3, 8) have a curvature such that the inclination of the ridges with respect to the circles of latitude, and thus an angle between a tangent of the ridge curvature and a circle of latitude, continuously increases from the equator (5) to the pole (4).

Abstract: An implant, having a surface segment with at least one break line delineating an opening or recess of a closure segment which can be removed from the surface segment, is produced by first making a sub-assembly of the implant and then weakening the material in the region of the break line by material deformation.

Abstract: The instrument has a collet (19) that has at least two clamping jaws (18, 18?) for engaging an engaging means (4) on an implant body (1). The collet is received in a sleeve portion (20), the free end (21) of which has a support portion (22) that can be supported on the surface of the implant. A tension element (23) that engages the collet is used as an actuating means for actuating the collet. The outer faces of the clamping jaws interact with the inner face of the sleeve portion such that the collet can be closed and moved relative to the free end of the sleeve portion by pulling the tension element.

Abstract: The invention relates to a ball-and-socket implant (I), in particular an acetabular implant, preferably in the shape of a spherical cup shell, said implant having at least one region with a surface structure (2, 7). The at least one region extends between the equator and the pole of the spherical cup shell. The surface structure comprises a plurality of structural elements (6), each of which is formed by a plurality of intersecting ridges (3, 8) with opposite inclinations. The number of structural elements (6) on the equator (5) or on a circle of latitude near the equator is the same as on a circle of latitude near the pole. The ridges (3, 8) have a curvature such that the inclination of the ridges with respect to the circles of latitude, and thus an angle between a tangent of the ridge curvature and a circle of latitude, continuously increases from the equator (5) to the pole (4).

Abstract: The present invention relates to a joint socket (1) for a hip joint prosthesis, with a metal outer shell (2) and with a preferably ceramic inner shell (3). The outer shell (2) and the inner shell (3) are held together with a force fit by shrinkage and are connected to each other by at least one additional form-fit means (4; 5). The at least one form-fit means (4;5) is arranged on the periphery in the equatorial edge region of the joint socket in such a way that, as a result of the shrinkage stress, it forms a sealing operative connection between outer shell (2) and inner shell (3). The present invention further relates to a method for producing a joint socket (1), in which method a metal outer shell (2) is shrink-fitted onto a preferably ceramic inner shell (3), wherein at least one peripheral form-fit means (4;5) in the equatorial edge region of the outer shell (2) engages in a corresponding means of the inner shell (3).

Abstract: The invention relates to a method for producing an implant (1) having at least one surface segment having at least one break line (3) delineating for exposing an opening or recess of a closure segment (2) removable from the surface segment by the effect of force. In a first, preferably machining method, a sub-assembly of the implant (1) is first produced. In a second step, the material strength in the region of the break line (3) is weakened by material deformation.

Abstract: The invention provides a method for determining parameters relevant to the print quality of a printed product. A macroscopic photogram of a measuring field of the printed product is recorded using a camera having a macro lens. An actual value of a parameter relevant to the print quality is determined from the macroscopic photogram. The actual value is compared to a nominal value of the parameter relevant to the print quality. Whether the measuring field is printed with adequate quality is determined based on the comparison of the actual valve with the nominal value of the parameter relevant to the print quality.

Abstract: The invention provides a method for determining parameters relevant to the print quality of a printed product. A macroscopic photogram of a measuring field of the printed product is recorded using a camera having a macro lens. An actual value of a parameter relevant to the print quality is determined from the macroscopic photogram. The actual value is compared to a nominal value of the parameter relevant to the print quality. Whether the measuring field is printed with adequate quality is determined based on the comparison of the actual valve with the nominal value of the parameter relevant to the print quality.