AUGMENTATION DEVICE AND METHOD FOR ADAPTING AN AUGMENTATION DEVICE

Abstract

The invention relates to an augmentation device comprising an annular cone surrounding a channel which extends through the cone from a proximal cone end to a distal cone end of said cone. The invention furthermore relates to a method for adapting a cone size of such an augmentation device.

Claims

1. An augmentation device comprising an annular cone surrounding a channel which extends from a proximal cone end to a distal cone end of the cone through said cone, wherein the cone consists by at least 50 percent by volume, based on the total volume of the cone, of a biocompatible polymer, and is subdivided, by at least three radially circumferential grooves in a cone lateral surface opposite the channel, into annular cone segments, wherein the grooves have a groove depth of at least 1 mm and a groove width of at least 1 mm, and form sawing guides in order to adapt a cone size of the cone by separating one or more cone segments.

2. The augmentation device according to claim 1, wherein the lateral cone surface is roughened or porous at least in portions.

3. The augmentation device according to claim 1, wherein the lateral cone surface is formed by at least 70 percent by area, based on the entire lateral cone surface, of tantalum, a tantalum alloy, titanium, a titanium alloy, or stainless steel.

4. The augmentation device according to claim 1, wherein the biocompatible polymer is a PMMA bone cement.

5. The augmentation device according to claim 4, wherein the PMMA bone cement contains at least one antibiotic.

6. The augmentation device according to claim 1, wherein the cone comprises radially circumferential inner grooves in a cone inner surface facing toward the channel, which inner grooves are arranged opposite the grooves.

7. The augmentation device according to claim 1, wherein the lateral cone surface comprises at least two axially extending axial grooves having an axial groove depth of at least 1 mm and an axial groove width of at least 1 mm, each of which is connected at least to one of the grooves.

8. The augmentation device according to claim 1, wherein the cone segments are separated from one another in a stepped manner.

9. A method for adapting a cone size of an augmentation device according to claim 1, comprising a step of separating one or more cone segments at the proximal cone end and/or at the distal cone end by sawing, cutting, or breaking along the radially circumferential groove or grooves.

10. The method according to claim 9 for adapting an augmentation device comprising: an annular cone surrounding a channel which extends from a proximal cone end to a distal cone end of the cone through said cone, wherein the cone consists by at least 50 percent by volume, based on the total volume of the cone, of a biocompatible polymer, and is subdivided, by at least three radially circumferential grooves in a cone lateral surface opposite the channel, into annular cone segments, wherein the grooves have a groove depth of at least 1 mm and a groove width of at least 1 mm, and form sawing guides in order to adapt a cone size of the cone by separating one or more cone segments, comprising a step of separating a conical part from the cone by sawing, cutting, or breaking along two of the axially extending axial grooves.

Description

BRIEF DESCRIPTION

[0095] In the following, the invention is illustrated further, by way of example, by figures. The invention is not limited to the figures.

[0096] Shown are:

[0097] FIG. 1 a schematic side view of an augmentation device,

[0098] FIG. 2 a further schematic side view of the augmentation device from FIG. 1,

[0099] FIG. 3 a schematic longitudinal section of the augmentation device of FIGS. 1 to 3,

[0100] FIG. 4 an enlarged detail of the schematic longitudinal section from FIG. 4,

[0101] FIG. 5 a schematic side view of the augmentation device from FIGS. 1 and 2, with adapted cone size,

[0102] FIG. 6 a schematic longitudinal section of a further augmentation device, and

[0103] FIG. 7 a schematic side view of a further augmentation device with cone segments separated in a stepped manner.

DETAILED DESCRIPTION

[0104] FIG. 1 shows a schematic side view of an exemplary embodiment of an augmentation device 100. The augmentation device 100 is formed as one piece and consists of a PMMA bone cement loaded with an antibiotic. The augmentation device 100 comprises a solid annular cone 200 comprising a proximal cone end 210 and a distal cone end 220, wherein a cone outer diameter, formed by a lateral surface 230 of the cone, decreases from the proximal cone end 210 in the direction of the distal cone end 220. In the shown embodiment, the cone outer diameter decreases substantially linearly from the proximal cone end 210 to the distal cone end 220.

[0105] A channel extends through the cone 200 from the proximal cone end 210 to the distal cone end 220.

[0106] Three grooves 400, which subdivide the cone into four annular cone segments 250, respectively extend radially in a complete circumference in the lateral surface 230 of the cone 200. The grooves 400 are thereby arranged in such a way that the cone segments 250 have a substantially equal axial extent. The grooves 400 serve as sawing guides so that one or more cone segments 250 can be separated from the augmentation device 100 by suitable means, for example with a saw, in a simplified and safe manner. A cone size of the augmentation device 100 is adapted with each separation of a single cone segment 250. For example, by separating a cone segment 250 at the proximal cone end 210, it occurs both that the axial extent of the cone 200 is reduced by substantially 25% and a maximum cone outer diameter of the cone 200 is reduced.

[0107] The grooves 400 respectively extend in a plane which extends perpendicular to a longitudinal axis 205 of the cone 200.

[0108] In the lateral surface 230, twelve axial grooves 430 continue to run. The axial grooves 430 extend over the cone segment 250 at the proximal cone end 210 and also partially over the cone segment 250 distally adjacent thereto. All axial grooves 440 are connected at least to the groove 400 at the proximal cone end 210, wherein four of the axial grooves 440 open into this groove 400, whereas the remaining axial grooves 400 extend beyond the groove 400 at the proximal cone end 210 until further in the direction of the distal cone end 220.

[0109] Two of the axial grooves 430 are connected to one another via a connecting groove 440 and form an axial groove pair. The axial grooves 440 form, with the groove 400 at the proximal cone end 210 and/or with the connecting grooves 440, conical parts 270 which can be simply and safely separated from the cone 200, for example by sawing, and allow an improved adaptation to the anatomical conditions of a patient.

[0110] FIG. 2 shows the augmentation device 100 from FIG. 1 in a side view, rotated by 90° about the longitudinal axis. It can be seen in FIG. 2 that the axial grooves 430 are arranged symmetrically so that conical parts 270 can be separated from the cone 200 on two sides at the proximal cone end 210.

[0111] FIG. 3 shows the augmentation device 100 from FIGS. 1 and 2 in a schematic longitudinal section. From FIG. 3 it is to be learned that the channel 300 is formed by a cone inner surface 240 and extends from the proximal cone end 210, through the cone 200, to the distal cone end 220. The cone 200 has a conical wall thickness 260 which is constant over the entire axial extent except for slight variances at the proximal cone end 210 and at the distal cone end 220. The cone wall thickness 260 of the shown embodiment of the augmentation device 100 is 10 mm. Furthermore, it can be seen that the cone 200 is of solid design, and therefore that there is no fluid-conducting connection through the cone 200 between the cone inner surface 240 and the lateral cone surface 230.

[0112] FIG. 4 shows an enlarged detail of the schematic longitudinal section of FIG. 3. FIG. 4 shows in particular an enlarged longitudinal section through one of the grooves 400 of the augmentation device 100. The groove 400 has a groove depth 410 extending perpendicular to the lateral surface 230 and a groove width 420 extending parallel to the lateral surface 230. In the shown embodiment of the augmentation device 100, the groove 40 has a groove depth 410 of 1 mm and a groove width 420 of 2.5 mm.

[0113] FIG. 5 shows the augmentation device 100 from FIGS. 1 to 4 in a schematic side view, with adapted cone size. In comparison to the preceding FIGS. 1 to 4, the cone segment 250 with the largest outer diameter was removed at the proximal cone end 210, so that the augmentation device 100 in FIG. 3 has a reduced maximum cone outer diameter. In addition, a conical part 270 has respectively been separated on both sides of the cone 200 along the middle pair of axial grooves 430, running on both cone sides, and their connecting groove 440.

[0114] FIG. 6 shows a schematic longitudinal section of a further exemplary augmentation device 100′. The embodiment of the augmentation device 100′ largely corresponds to the embodiments described above and shown in FIGS. 1 through 5, and therefore reference is made to the above description to avoid repetition. Modifications of any of the embodiments shown in FIGS. 1 to 5 have the same reference sign with an apostrophe.

[0115] The augmentation device 100′ differs from the augmentation device 100 from FIGS. 1 to 5 by a porous lateral surface 230′ formed from titanium. In the shown embodiment of the augmentation device 100′, the lateral surface 230′ is formed entirely of titanium.

[0116] FIG. 7 shows a schematic side view of another exemplary augmentation device 100″. The embodiment of the augmentation device 100″ largely corresponds to the embodiments described above and shown in FIGS. 1 to 5 and FIG. 6, and therefore reference is made to the above description to avoid repetition. Modifications to an embodiment shown in FIGS. 1 to 5 and FIG. 6 have the same reference sign with two apostrophes.

[0117] The augmentation device 100″ differs from the augmentation devices 100 and 100′ from FIGS. 1 to 5 and FIG. 6 by cone segments 250″ that are recessed from one another in a stepped manner. Due to the step-like cone segments 250″, the cone outer diameter of the augmentation device 100″ does not decrease substantially linearly from the proximal cone end 210″ to the distal cone end 220″, but rather “abruptly” between the cone segments 250″.

REFERENCE NUMERALS

[0118] 100, 100′, 100″ Augmentation device [0119] 200, 200′, 200″ Cone [0120] 205 Longitudinal axis of the cone [0121] 210, 210′, 210″ Proximal cone end [0122] 220, 220′, 220″ Distal cone end [0123] 230, 230′, 230″ Lateral cone surface [0124] 240, 240′ Cone inner surface [0125] 250, 250′, 250″ Cone segment [0126] 260, 260′ Cone wall thickness [0127] 270, 270″ Conical part [0128] 300, 300′ Channel [0129] 400, 400′, 400″ Groove [0130] 410 Groove depth [0131] 420 Groove width [0132] 430, 430″ Axial groove [0133] 440, 440″ Connecting groove