Abstract
The invention relates to an augmentation device comprising an annular cone surrounding a channel which extends axially along a longitudinal axis of the augmentation device from a proximal cone end to a distal cone end, wherein an outer diameter of the cone decreases from the proximal cone end in the direction of the distal cone end.
Claims
1. An augmentation device comprising an annular cone surrounding a channel which extends axially along a longitudinal axis of the augmentation device from a proximal cone end to a distal cone end, wherein an outer diameter of the cone decreases from the proximal cone end in the direction of the distal cone end, wherein at least two metal plates following an outer contour of the cone are arranged on a lateral surface of the cone, wherein the cone is reversibly detachable from the metal plates by displacing the cone in the direction of the proximal cone end.
2. The augmentation device according to claim 1, wherein the metal plates are spaced apart from one another by axially extending gaps between the metal plates.
3. The augmentation device according to claim 2, wherein axially extending webs are formed on the lateral surface of the cone, which engage in the gaps between the metal plates.
4. The augmentation device according to claim 3, wherein the webs comprise at least one web guide means which fluidically connects the proximal cone end to the distal cone end and/or the proximal cone end to a web outer surface.
5. The augmentation device according to claim 1, wherein the cone comprises at least one cone guide means which fluidically connects the proximal cone end and the distal cone end.
6. The augmentation device according to claim 1, wherein the cone comprises a sliding element at the proximal cone end, which sliding element interacts with the metal plates at a proximal metal plate end facing the proximal cone end such that a force acting on the cone from the direction of the proximal cone end can be transmitted to the metal plates via the sliding element.
7. The augmentation device according to claim 1, wherein the metal plates are arranged on the lateral surface of the cone such that a reversible, form-fitting connection is formed between the metal plates and the lateral surface.
8. The augmentation device according to claim 1, wherein a cone wall thickness of the cone is greater than or equal to a metal plate wall thickness of the metal plates.
9. The augmentation device according to claim 1, wherein the metal plates cover at least 80% by area of the lateral surface of the cone.
10. The augmentation device according to claim 1, wherein a metal plate outer surface facing away from the lateral surface of the cone is roughened, porous, and/or comprises blind holes.
11. The augmentation device according to claim 10, wherein the blind holes comprise a diameter of less than 3 mm.
12. The augmentation device according to claim 1, wherein the cone comprises feedthroughs which fluidically connect the channel to an intermediate space between the cone and the metal plates.
13. The augmentation device according to claim 1, wherein a scraper element is arranged on a distal channel end facing the distal cone end.
14. The augmentation device according to claim 1, wherein the metal plates comprise a biocompatible metal.
15. The augmentation device according to claim 1, wherein the cone comprises a biocompatible polymer.
Description
FIGURES
[0087] In the following, the invention is illustrated further, by way of example, by figures. The invention is not limited to the figures.
[0088] Shown are:
[0089] FIG. 1 a schematic perspective side view of an augmentation device in a separate state,
[0090] FIG. 2 the augmentation device from FIG. 1 in a perspective side view in an assembled state,
[0091] FIG. 3 a schematic perspective side view of a further augmentation device,
[0092] FIG. 4 a schematic exploded view of a further augmentation device,
[0093] FIG. 5 a schematic perspective sectional view of a further augmentation device,
[0094] FIG. 6 a schematic perspective sectional view of a further augmentation device,
[0095] FIG. 7 a schematic perspective side view of a further augmentation device in a separate state,
[0096] FIG. 8 a schematic perspective side view of a further augmentation device.
DESCRIPTION OF THE FIGURES
[0097] FIG. 1 is a schematic side view of an augmentation device 100 in a separate state. The augmentation device 100 comprises an annular cone 200 through which a fluid-conducting channel 300 extends axially from a proximal cone end 210 to a distal cone end 220. The cone 200 comprises an outer diameter which decreases from the proximal cone end 210 in the direction of the distal cone end 220. The cone 200 comprises an elliptical cross-section.
[0098] The cone 200 comprises a lateral surface 230 and two, axially extending webs 240 facing one another on the lateral surface 230 (only one of the webs 240 is completely visible). The cone 200 and the webs 240 are formed in one piece. A channel-like web guide means 245, which fluidically connects the proximal cone end 210 to the distal cone end 220, extends axially through each of the webs 240. The web guide means 245 allow a pharmaceutical fluid, e.g., an aqueous antibiotic solution, to be applied, via the proximal cone end 210, which is easily accessible for the surgeon in the implanted state of the augmentation device 100, to the distal cone end 220, which is difficult to access for the surgeon in the implanted state of the augmentation device 100.
[0099] In addition to the cone 200, the augmentation device 100 comprises two bent metal plates 400, wherein the metal plates are shaped such that they can be arranged, following an outer contour of the cone, in contact with the lateral surface 230. In FIG. 1, the cone 200 and the metal plates 400 of the augmentation device 100 are shown separately from one another.
[0100] The metal plates 400 are shaped in particular on a metal plate inner surface 410 facing the cone 200 such that the metal plates 400—in particular, the metal plate inner surface 410—follow the outer contour of the cone 200 such that the metal plates 400 can be arranged in contact with the lateral surface 230.
[0101] At the proximal cone end 210, the cone 200 further comprises a sliding element 250 extending radially around the cone 200, in particular the proximal cone end 210. The metal plates 400 each comprise a metal plate recess 420, into which the sliding element 250 can engage when the metal plates 400 are arranged on the lateral surface. This facilitates the arrangement and improves the adhesion of the metal plates 400 to the lateral surface 230.
[0102] FIG. 2 shows the augmentation device 100 from FIG. 1 in a perspective side view in an assembled state. The metal plates 400 are arranged on the cone 200 and are in contact with the lateral surface 230 (cf. FIG. 1), so that the metal plate inner surfaces 410 (cf. FIG. 1) are substantially completely in contact with the lateral surface 230 (cf FIG. 1). In the assembled state, the sliding element 250 engages in the metal plate recesses 420 (cf FIG. 1), so that an axial force application on the cone 200 from the proximal cone end 210 in the direction of the distal cone end 220 is transmitted to the metal plates 400 via the sliding element 250. This facilitates the implantation of the augmentation device 100 in a patient and ensures that the metal plates 400 do not slip on the lateral surface 230 (cf FIG. 1) in the direction of the proximal cone end 210 during implantation. In the assembled state, the metal plates 400 are located both on the lateral surface 230 (cf FIG. 1) and on the webs 240. The metal plates 400 are spaced apart from one another by the webs 240. Between the metal plates 400, gaps (not shown) are formed, which are substantially completely filled by the webs 240. The webs 240 prevent unintentional slippage of the metal plates 400 on the cone 200.
[0103] FIG. 3 is a perspective side view of a further embodiment of an augmentation device 100′ in an assembled state. The embodiment of the augmentation device 100′ largely corresponds to the embodiment described above and shown in FIGS. 1 and 2, and therefore reference is made to the above description in order to avoid repetition. Modifications to an embodiment shown in FIGS. 1 and 2 have the same reference sign with an additional apostrophe. The augmentation device 100′ differs from the augmentation device 100 from FIGS. 1 and 2 by blind holes 430 present in the metal plates 400′ (numbered only by way of example and only visible on the metal plate 400′ facing the observer of the drawing). The blind holes 430 improve growth and ingrowth of bone tissue on and into the metal plates 400′.
[0104] FIG. 4 is a perspective side view of a further embodiment of an augmentation device 100″ in a separate state. The embodiment of the augmentation device 100″ largely corresponds to the embodiments described above and shown in FIGS. 1 through 3, and therefore reference is made to the above description to avoid repetition. Modifications of any of the embodiments shown in FIGS. 1 through 3 have the same reference sign with two apostrophes. The embodiment of the augmentation device 100″ differs from the embodiment of the augmentation device 100′ from FIG. 3 in that the channel-like web guide means 245″ extending axially through the webs 240″ comprise further web guide means openings 246 (numbered only by way of example) on the outer web surfaces 240a facing the metal plates 400″ in the assembled state of the augmentation device 10″. As a result, a pharmaceutical fluid, e.g., an aqueous antibiotic solution, can be applied not only to the distal cone end 220″, but, additionally, also over the axial extension of the augmentation device 100″. In order to achieve as uniform a distribution as possible over the entire circumference of the augmentation device 100″ when a pharmaceutical fluid is applied to the web guide means 245″ at the proximal cone end 210″, the further web guide means openings 246 are connected in a fluid-conducting manner to inner grooves 440 extending on the inner metal plate surfaces 410″ in the assembled state of the augmentation device 100″. The inner grooves 440 are in turn fluidically connected to the blind holes 430″ in order to allow as uniform a distribution of a pharmaceutical fluid as possible over the circumference of the augmentation device 100″.
[0105] FIG. 5 is a sectional view of a perspective side view of a further embodiment of an augmentation device 100′″ in an assembled state. The embodiment of the augmentation device 100′″ largely corresponds to the embodiments described above and shown in FIGS. 1 through 4, and therefore reference is made to the above description to avoid repetition. Modifications of any of the embodiments shown in FIGS. 1 through 4 have the same reference sign with three apostrophes. The embodiment of the augmentation device 100′″ differs from the embodiment of the augmentation device 100″ according to FIG. 4 in that the metal plates 400′″ do not comprise blind holes, and in that the web guide means openings 246′″ of the web guide means 245′″ facing the metal plates 400′″ are not fluidically connected to inner grooves extending on the metal plate inner surfaces, but are fluidically connected to outer grooves 445 extending on the metal plate outer surface. The outer grooves 445 allow the most extensive possible distribution of a pharmaceutical fluid applied into the web guide means 245′″ at the proximal cone end 210′″ over the circumference of the augmentation device 100′″.
[0106] FIG. 6 is a sectional view of a perspective side view of a further embodiment of an augmentation device 100″″ in an assembled state. 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 through 5 have the same reference sign with four apostrophes. The embodiment of the augmentation device 100″″ differs from the previous embodiments in that the metal plates 400″″ are formed on both sides of the cone 200″″ from a plurality of—in particular, from in each case six—metal plate segments 450 (numbered only by way of example). The individual metal plate segments 450 are reversibly separable from one another, as a result of which the metal plates 400″″ are quickly and easily adaptable in their axial extension along the longitudinal axis of the augmentation device 100″″. For example, the two metal plate segments 450 can be removed at the distal cone end 220″, whereby the metal plates 400″″ are “shortened” around these two metal plate segments. Thus, anatomical specifics of a patient during an operation can be addressed quickly and easily.
[0107] FIG. 7 is a perspective side view of a further embodiment of an augmentation device 100′″″ in a separate state. The embodiment of the augmentation device 100′″″ largely corresponds to the embodiments described above and shown in FIGS. 1 through 6, and therefore reference is made to the above description to avoid repetition. Modifications of any of the embodiments shown in FIGS. 1 through 6 have the same reference sign with five apostrophes. The embodiment of the augmentation device 100″″ differs from the previous embodiments in that the cones 200′″″ comprise four, axially extending webs 240′″″ distributed substantially uniformly over the lateral surface 230″″″, and four metal plates 400″″. The cone 20′″″ comprises feedthroughs 260 (numbered only by way of example) which, in the assembled state of the augmentation device 100′″″, fluidically connect the channel 300′″″ and the metal plates 400′″″ to one another. A bone cement paste, which is applied in the implanted state of the augmentation device 100′″″ into the channel via the proximal cone end 210′″″, can reach the metal plates 400′″″ through the feedthroughs 260 and fill any intermediate spaces between the metal plates 400′″″ and the lateral surface 230′″″ of the cone 200′″″. This reduces micromovements of the metal plates 400′″″ and reduces or prevents material abrasion, in particular metal abrasion.
[0108] FIG. 8 is a perspective side view of a further embodiment of an augmentation device 100′″″ in an assembled state. The embodiment of the augmentation device 100′″″ largely corresponds to the embodiments described above and shown in FIGS. 1 through 7, and therefore reference is made to the above description to avoid repetition. Modifications of any of the embodiments shown in FIGS. 1 through 7 have the same reference sign with six apostrophes. At the distal cone end 220″″″, the augmentation device 100″″″ comprises a scraper element 270 which is fixedly connected to the cone 200″″″ and is designed as an elastically deformable plate comprising four notches 271 intersecting at one point (numbered only as an example). The notches 271 form plate sections in the plate of the scraper element 270. The scraper element 270 fluidically closes the distal cone end 220″″″ for bone cement paste (not shown) applied through the proximal cone end 210″″″ into the channel (not shown in FIG. 8; cf, for example, FIG. 1), so that the bone cement paste does not emerge from the distal cone end 220″″″ and remains within the channel. In conjunction with the notches 271, the elastic material of the scraper element 270 allows a stem of a prosthesis (not shown) to be pushed out through the channel from the direction of the proximal cone end 210″″″ by the bone cement paste located there and, by the scraper element 270, from the distal cone end 220″″″. In this case, the plate sections formed by the notches 271 in the scraper element 270 are bent outwards through the stem and scrape adhering bone cement off the stem as it is pushed out of the distal cone end 220″″″. The stem is thus, when it leaves the augmentation device 100″″″, substantially free of bone cement paste at the distal cone end 220″″″.
REFERENCE SIGNS
[0109] 100, 100′, 100″, 100′″, Augmentation device [0110] 100″″, 100′″″, 100″″″ [0111] 200, 200′, 200″, 200′″, Cone [0112] 200″″, 200′″″, 200″″″ [0113] 210, 210′, 210″, 210′″, Proximal cone end [0114] 210″″, 210′″″, 210″″″ [0115] 220, 220′, 220″, 220′″, Distal cone end [0116] 220″″, 220′″″, 220″″″ [0117] 230, 230″, 230′″″ Lateral surface [0118] 240, 240′, 240″, 240′″, Web [0119] 240″″, 240′″″, 240″″″ [0120] 240a Web outer surface [0121] 245, 245′, 245″, 245′″ Web guide means [0122] 246 Web guide means opening [0123] 250, 250′, 250″, 250′″, Sliding element [0124] 250″″, 250′″″, 250″″″ [0125] 260 Feedthrough [0126] 270 Scraper element [0127] 271 Notch [0128] 300, 300′, 300″, 300′″ Channel [0129] 300″″, 300′″″, 300″″″ [0130] 400, 400′, 400″, 400′″, Metal plate [0131] 400″″, 400′″″, 400″″″ [0132] 410, 410″ Metal plate inner surface [0133] 420, 420″ Metal plate recess [0134] 430, 430″ Blind hole [0135] 440 Inner groove [0136] 445 Outer groove [0137] 450 Metal plate segment
