Source: http://www.google.com/patents/US20050267581?dq=6188988
Timestamp: 2016-09-30 00:45:22
Document Index: 383014020

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Patent US20050267581 - Intervertebral Implant - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsAn intervertebral implant comprises first and second parts having outer surfaces engaging adjacent vertebral surfaces. An insert between these parts provides relative movement therebetween. The first and/or second parts may have engagement means in the form of apertures for engagement with insertion...http://www.google.com/patents/US20050267581?utm_source=gb-gplus-sharePatent US20050267581 - Intervertebral ImplantAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS20050267581 A1Publication typeApplicationApplication numberUS 11/185,781Publication dateDec 1, 2005Filing dateJul 21, 2005Priority dateJul 2, 1999Also published asCA2391330A1, CA2391330C, DE29911422U1, DE29924985U1, DE59914691D1, EP1194088A1, EP1194088B1, EP1795155A2, EP1795155A3, EP1795155B1, US6936071, US8506634, US8795371, US8882839, US8974530, US20050085917, US20070265707, US20130173005, US20150142113, WO2001001893A1Publication number11185781, 185781, US 2005/0267581 A1, US 2005/267581 A1, US 20050267581 A1, US 20050267581A1, US 2005267581 A1, US 2005267581A1, US-A1-20050267581, US-A1-2005267581, US2005/0267581A1, US2005/267581A1, US20050267581 A1, US20050267581A1, US2005267581 A1, US2005267581A1InventorsThierry Marnay, Boris BeyersdorffOriginal AssigneeThierry Marnay, Boris BeyersdorffExport CitationBiBTeX, EndNote, RefManPatent Citations (101), Referenced by (138), Classifications (41), Legal Events (3) External Links: USPTO, USPTO Assignment, EspacenetIntervertebral Implant
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [0035] The intervertebral implant 1 shown in the drawing includes three parts, namely a platelike upper part 2, a platelike lower part 3, and a substantially platelike pivot insert 4. [0036] The upper part 2 is embodied flat on its top, thus creating a support face 5, on which various kinds of protrusions 6, 7 are disposed which serve the purpose of anchoring the upper part 2 in a vertebra that rests, with its end face toward an intervertebral space, on the support face 5. [0037] The upper part 2 is substantially rectangular in cross section; in the exemplary embodiment shown, a longitudinal edge 8 curves outward. [0038] On the two short sides of this rectangle, the thickness of the platelike upper part 2 is less than in the central region, so that along the short sides of the upper part 2, downward-pointing recesses 9 each extending parallel to these edges are formed that are open toward the outside. The central region of the upper part 2 is located between the two recesses 9 and thus has a greater thickness or height and thus forms a downward-pointing protrusion 10 embodied between the two recesses 9. This protrusion is defined by an underside 11, which extends substantially parallel to the support face 5 and in which there is a spherical indentation 12, which forms a bearing plate for the pivot insert 4. [0039] The lower part 3 of the intervertebral implant 1 is also platelike in embodiment and on its underside has a flat support face 13 with protrusions 14 and 15, which correspond to the protrusions 6 and 7 of the support face 5. On the side remote from the support face 13, the thickness of the lower part 3 is less in the central region than in an outer region. This outer region of greater thickness has the form of a U, with two parallel legs 16, 17, which extend parallel to the short edges of the lower part 3, which in cross section is embodied similarly to the upper part 2, and with a crosspiece 18 that connects the two legs 16 and 17 on one end. The region enclosed by the legs 16 and 17 and the crosspiece 18 forms a central indentation 19, whose area is substantially equivalent to the area of the central protrusion 10 of the upper part 2, while the disposition and length of the legs 16 and 17 correspond essentially to the disposition and length of the recesses 9 on the upper part 2. As a result, it is possible to place the upper 2 and lower part 3 on one another in such a way that the central protrusion 10 of the upper 2 dips into the central indentation 19, while the legs 16 and 17 of the lower part 3 dip into the recesses 9 of the upper part 2 (FIG. 4); in this position, the upper part 2 and lower part 3 have maximum proximity to one another and a minimal structural height. [0040] The dimensions are selected such that the various recesses are essentially filled completely by the protrusions dipping into them. [0041] Blind bores 20 and 21 are machined into the two legs 16 and 17 of the lower part 3, extending parallel to these legs 16, 17 from their free ends; the diameter of these bores is relatively great in proportion to the height of the legs 16, 17, and this diameter is in fact greater than the thickness or height of the lower part 3 in the region of the central indentation 19. [0042] Blind bores 22 and 23, which extend parallel to the blind bores 20 and 21 in the lower part 3, are machined into the central protrusion 10 of the upper part 2, in the vicinity of its side edges. These blind bores 22 and 23 again have a relatively great diameter, which corresponds to a substantial portion of the height of the protrusion 10 and is greater than the thickness of the upper part 2 in the region of the recesses 9. [0043] When the upper part 2 and lower part 3 rest tightly against one another in the manner described, the blind bores 20 and 21 of the lower part 3 and the blind bores 22 and 23 of the upper part 2 overlap at least partly in the direction of the height of the intervertebral implant 1, as is clearly shown in FIGS. 4 and 5. [0044] The blind bores 20, 21, 22 and 23 serve as receptacles for pinlike extensions of a manipulation instrument, not shown in the drawing, and thus form engagement elements for this manipulation instrument, which in this way separately engages the upper part 2 and the lower part 3. With this manipulation instrument, it is possible to introduce the upper part 2 and the lower part 3 of the intervertebral implant 1 into an intervertebral space; the very low structural height of the intervertebral implant 1 facilitates this introduction, which can be done essentially without major widening of the intervertebral space. [0045] After the introduction of the upper part 2 and lower part 3 in this way, the two parts of the intervertebral implant 1 can be spread apart; that is, their spacing is increased, for instance with the aid of the manipulation instrument that is holding the upper 2 and the lower part 3. [0046] In this spread-open position of the upper part 2 and lower part 3, it is possible to thrust the pivot insert 4 between the upper part 2 and the lower part 3. [0047] This pivot insert is constructed essentially in the shape of a plate, which has a flat underside 24 and a spherically upward-curved top side 25. The outer dimensions of the platelike pivot insert correspond to those of the central indentation 19 in the lower part 3, so that the pivot insert 4 can be thrust into this indentation, filling it up, specifically from the side toward which the blind bores 20, 21, 22, 23 open. Guide strips 26 on the side edges of the pivot insert 4 engage corresponding guide grooves 27 in the legs 16, 17, so that an insertion guide for the pivot insert 4 is formed that fixes it in the lower part 3 after its insertion. The inserted pivot insert 4, after insertion, fills up the indentation 19 and protrudes with its spherically curved top side 25 upward past the top side of the lower part 3; the spherical top side 25 dips in complimentary fashion into the spherically curved indentation 12 on the underside of the protrusion 10, where with the upper part 2 it forms a ball joint, which enables a certain pivotability of the upper part 2 relative to the lower part 3 (FIG. 7). [0048] The pivot insert 4 can have a detent protrusion 28 on its flat underside 24; when the pivot insert 4 is inserted into the lower part 3, this protrusion locks elastically into a detent recess 29 that is located on the bottom of the indentation 19; as a result, the pivot insert 4 is also fixed in the insertion direction in the indentation 19. [0049] The upper part 2 and lower part 3 are preferably made of physiologically safe metal, such as titanium, while the pivot insert 4 preferably comprises a likewise physiologically safe plastic material, such as polyethylene. These support faces 5 and 13 can be embodied in an especially bone-compatible way; for instance, this surface can be roughened by a coating, so that optimal anchoring to the adjacent bone material is obtained. [0050] The invention may also be described as follows, which description is the full equivalent of the preceding discussion. An upper part 2 has an upper surface 5 for engaging a vertebrae and a lower surface which comprises a downward pointing protrusion 10 between side recesses 9 and a rounded portion, preferably in the form of a concave spherical indentation 12. A lower part 3 has a lower surface 13 for engaging a vertebrae. A pivot insert 4, when joined to the lower part 3, as shown for example in FIG. 3, provides a convex upper surface portion 25, preferably spherical, in operational engagement with the rounded portion 12 of the upper part. [0051] The lower part 3 and pivot insert 4 may, taken together, be described as a lower part formed in two pieces, namely the elements 3 and 4, wherein the element 3 may be referred to as a lower piece and the element 4 may be referred to as an upper piece. [0052] The upper and lower parts include on their upper surface and lower surface, respectively, protrusions 7 and 14 which may also be referred to as anchors, which anchor the upper and lower parts, respectively, into the adjacent vertebrae that form the intervertebral space and rest against the respective upper and lower surfaces. [0053] As shown in the figures, the anchors 6 and 14 each have a zigzag edge which comprise teeth. As best shown in FIG. 7, anchor 6 is greater in height than the remainder of the upper part 2, i.e., from surface 5 to the bottom of protrusion 10. Similarly, anchor 14 is greater in height than the remainder of the lower part 3, i.e., from lower surface 13 to the top of walls 16, 17 and 18. As also shown in the figures, in the preferred embodiment, the length of the anchors 6 and 14, i.e., in the direction from the anterior to the posterior thereof, is greater than one half of the overall dimension of its respective part from its anterior to its posterior, passing through that anchor. [0054] The lower part comprises three walls including parallel side walls 16 and 17 and a rear wall 18. These walls form between them a central indentation 19 which comprises a recess with a generally flat surface. The fourth side of the recess is open. The pivot insert 4 has a detent 28 that snap-fits into a detent recess 29 formed in the generally flat surface of recess 19. [0055] As best shown in FIGS. 2, 4 and 5, in the absence of pivot insert 4, the protrusion 10 of upper part 2 can fit down between walls 16, 17 and 18 of the lower part 2. This fitting of protrusion 10 within the recess 19, surrounded by walls 16, 17 and 18 may be referred to as “nesting” since the protrusion 10 essentially “nests” within recess 19. With the upper and lower parts in this nested condition, as shown in FIGS. 4 and 5, the combined height of the upper and lower parts 2 and 3, i.e., the height from surface 13 to surface 5, is less than the total additive height of the upper and lower parts, taken separately, i.e., less than the total of the height from surface 13 to the top of walls 16, 17 and 18 plus the height from surface 5 to the bottom of protrusion 10. [0056] To reach its final destination within an intervertebral space, the implant must of course be moved along a path from outside of the patient, into the patient, and then into the intervertebral space. In the illustrated embodiment, as described above, instruments would engage apertures 20, 21, 22 and 23 to move the implant along a path. The anchors 6 and 14 are parallel to this path. As a point of reference, lateral planes parallel to the direction of this path pass through opposed side surfaces of the parts. Thus, in the illustrated embodiment, the path would be parallel to the front to rear (anterior to posterior) direction, wherein, during insertion, the rear (posterior) of the implant would constitute the lead end and the front (anterior) thereof would constitute the trailing end. [0057] Although the invention has been described in detail with respect to preferred embodiments thereof, it will be apparent that the invention is capable of numerous modifications and variations, apparent to those skilled in the art, without departing from the spirit and scope of the invention. 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