US20030100950A1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cage-type intervertebral implant
Assignee: Scolio GmbH
•
Filing: 2001-03-21
•
Granted: —
•
Expires: 2021-03-21
Abstract
Abstract The invention relates to a cage-type intervertebral implant that is made up of a dished side wall ( 1 ), a cambered side wall ( 2 ), a front part ( 3 ), a rear part ( 4 ) and at least one intermediate wall ( 5, 6 ), thus comprising at least two cavities ( 7, 8, 9 ). An upper and a lower cage surface ( 10, 11 ) include a first lordosis angle (α 1 ) in the direction front part-rear part and a second lordosis angle (α 2 ) perpendicular thereto, said cage surfaces ( 10, 11 ) intersecting outside the cage. The cage structure is characterized by a doubler-wedge geometry (double-wedge-shaped cage) that is defined by the two lordosis angles (α 1 ) and (α 2 ) and that advantageously adapts itself to the anatomical conditions in the intervertebral area. The cage is further characterized by a high moment of tilt that effectively counteracts a tipping of the cage. The method used for producing the cage structure is essentially characterized by working the cage material by means of a high-pressure water jet, said cold-cutting technique having proved to be the most economical.
Inventors
- 👤 Olivier Moret
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:31
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/44; A61F2/4455; A61F2/4465; A61F2/3094; A61F2/30965; A61F2/442; A61F2/46; A61F2/4603; A61F2/4611; A61F2002/30001; A61F2002/30003; A61F2002/3006; A61F2002/3008; A61F2002/30108; A61F2002/3011; A61F2002/30112; A61F2002/30133; A61F2002/30316; A61F2002/30535; A61F2002/30593; A61F2/30767; A61F2/30771; A61F2002/30772; A61F2002/30774; A61F2002/30777; A61F2002/30784; A61F2002/30785; A61F2002/30787; A61F2002/30795; A61F2002/30807; A61F2002/3082; A61F2002/30827; A61F2002/30828; A61F2002/30878; A61F2002/30879; A61F2002/30891; A61F2002/30892; A61F2002/30976; A61F2230/00; A61F2230/0002; A61F2230/0004; A61F2230/0015; A61F2250/00; A61F2250/0058; A61F2250/0096; A61F2250/0098; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00017; A61F2310/00023; A61F2310/00389; A61F2310/00592; A61F2310/00796
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
220 words
1 . Cage for a cage-like intervertebral implant, comprising a member divided into cavities, wherein the cage ( 100 ) is constituted by a concave-curved sidewall ( 1 ), a convex-curved sidewall ( 2 ), a front portion ( 3 ), and a rear portion ( 4 ), a first, inner radius of curvature (R 1 ) being allocated to the inner sidewall ( 1 ), and a second, outer radius of curvature (R 2 ) being allocated to the outer sidewall ( 2 ); the sidewalls are connected to the front portion and the rear portion; the sidewalls ( 1 , 2 ) are connected to at least one partition ( 5 , 6 ) substantially perpendicular to the sidewalls, whereby the cage ( 100 ) has at least two cavities ( 7 , 8 , 9 ); and the sidewalls ( 1 , 2 ), front portion ( 3 ), rear portion ( 4 ), and the at least one partition ( 5 , 6 ) form an upper and a lower cage surface ( 10 , 11 ), the latter forming a lordosis angle (@ 1 ) in the front portion-rear portion direction, and a second lordosis angle (@ 2 ) perpendicular thereto, in that the cage surfaces ( 10 , 11 ) intersect outside the cage.
Claim 2
Dependent Claim
220 words
1 . Cage for a cage-like intervertebral implant, comprising a member divided into cavities, wherein the cage ( 100 ) is constituted by a concave-curved sidewall ( 1 ), a convex-curved sidewall ( 2 ), a front portion ( 3 ), and a rear portion ( 4 ), a first, inner radius of curvature (R 1 ) being allocated to the inner sidewall ( 1 ), and a second, outer radius of curvature (R 2 ) being allocated to the outer sidewall ( 2 ); the sidewalls are connected to the front portion and the rear portion; the sidewalls ( 1 , 2 ) are connected to at least one partition ( 5 , 6 ) substantially perpendicular to the sidewalls, whereby the cage ( 100 ) has at least two cavities ( 7 , 8 , 9 ); and the sidewalls ( 1 , 2 ), front portion ( 3 ), rear portion ( 4 ), and the at least one partition ( 5 , 6 ) form an upper and a lower cage surface ( 10 , 11 ), the latter forming a lordosis angle (@ 1 ) in the front portion-rear portion direction, and a second lordosis angle (@ 2 ) perpendicular thereto, in that the cage surfaces ( 10 , 11 ) intersect outside the cage.
Claim 3
Dependent Claim
54 words
2 . Cage according to claim 1 , wherein the inner sidewall ( 1 ) has a smaller height than the outer sidewall ( 2 ), or the outer sidewall ( 2 ) has a smaller height than the inner sidewall ( 1 ), whereby a second lordosis angle (@ 2 ) is formed.
Claim 4
Dependent Claim
34 words
3 . Cage according to claim 1 or 2 , wherein the front portion ( 3 ) and the rear portion ( 4 ) have a substantially equal second lordosis angle (@ 2 ).
Claim 5
Dependent Claim
26 words
4 . Cage according to one of claims 1 - 3 , wherein the lordosis angle (@ 1 ) is 2-8°, preferably 3, 5, or 7°.
Claim 6
Dependent Claim
31 words
5 . Cage according to one of claims 1 - 4 , wherein the lordosis angle (@ 2 ) is 0.1-4°, preferably 2°, and in the limiting case is identically zero.
Claim 7
Dependent Claim
42 words
6 . Cage according to one of claims 1 - 5 , wherein the first, inner radius of curvature (R 1 ) and the second, outer radius of curvature (R 2 ) have substantially the same centers, but preferably centers arranged offset.
Claim 8
Dependent Claim
45 words
7 . Cage according to one of claims 1 - 6 , wherein the inner radius of curva-ture (R 1 ) is 15-23 mm, preferably 22 mm, and the outer radius of curvature (R 2 ) is 18-26 mm, preferably 19, 21 or 23 mm.
Claim 9
Dependent Claim
31 words
8 . Cage according to one of claims 1 - 7 , wherein the inner sidewall ( 1 ) has at least one opening ( 13 , 14 , 15 ).
Claim 10
Dependent Claim
24 words
9 . Cage according to one of claims 1 - 8 , wherein the outer sidewall ( 2 ) has at least one opening.
Claim 11
Dependent Claim
31 words
10 . Cage according to one of claims 1 - 9 , wherein the front portion ( 3 ) is rounded and has at least one beveled surface ( 23 ).
Claim 12
Dependent Claim
52 words
11 . Cage according to one of claims 1 - 10 , wherein the rear portion ( 4 ) has in its middle a hole ( 20 ) with an internal thread, which is surrounded by two guide elements ( 21 , 22 ) which run substantially parallel or in a V-shape.
Claim 13
Dependent Claim
44 words
12 . Cage according to claim 11 , wherein the guide elements [ 21 , 22 ] are arranged about perpendicular, or about parallel, or at an angle of 0° to 90°, preferably 45°, to the cage surfaces around the hole ( 20 ).
Claim 14
Dependent Claim
25 words
13 . Cage according to claim 11 or 12 , wherein the guide elements ( 21 , 22 ) are constituted as ribs or recesses.
Claim 15
Dependent Claim
50 words
14 . Cage according to one of claims 1 - 13 , wherein holes ( 31 , 32 , 33 ) are provided in the front portion ( 3 ) and in the rear portion ( 4 ) for markers of a metal of high density as balls and/or pins.
Claim 16
Dependent Claim
18 words
15 . Cage according to claim 14 , wherein tantalum is provided as the metal for the markers.
Claim 17
Dependent Claim
27 words
16 . Cage according to claim 14 or 15 , wherein the markers are arranged as pins about perpendicular or parallel to the hole ( 20 ).
Claim 18
Dependent Claim
42 words
17 . Cage according to one of claims 1 - 16 , wherein the cage surfaces ( 10 , 11 ) have tabular raised portions ( 24 , 25 , 26 , 27 ) which run substantially parallel to the cage surfaces.
Claim 19
Dependent Claim
68 words
18 . Cage according to one of claims 1 - 17 , wherein it has a tilting moment (M) directed in the direction of the center of the inner radius of curvature (R 1 ) and, in comparison with the tilting moment of a cuboidal cage of the same cross section, same length and comparable cage structure, exceeding this tilting moment by a factor of at least 1.30.
Claim 20
Dependent Claim
44 words
19 . Cage according to one of claims 1 - 18 , wherein it consists of polyether ether ketone (PEEK), polyether ketone ether ether ketone (PEKEEK), or of polysulfone (PS), or of a composite material, preferably carbon fiber reinforced composites of CFK/PEEK and CFK/PEKEEK.
Claim 21
Dependent Claim
21 words
20 . Cage according to one of claims 1 - 18 , wherein it consists of titanium or a Ti alloy.
Claim 22
Dependent Claim
22 words
21 . Cage according to claim 20 , wherein it has a hydroxyapatite ceramic (HAK) coating or a tricalcium phosphate (TCP) coating.
Claim 23
Dependent Claim
54 words
22 . Cage according to one of claims 1 - 21 , wherein it has a Cage Mass Index (CMI) according to Equation (1) CMI=Volume of cage material/Volume of cage (1) which for CFK/PEEK, CFK/PEKEEK, and PS is less than 0.25, preferably 0.22, and for titanium or Ti alloys, less than 0.20, preferably 0.17.
Claim 24
Dependent Claim
131 words
23 . Process for the production of a cage according to one of claims 1 - 22 , wherein in a first step a blank of cage material is machined in a first direction by means of an ultrahigh pressure water jet, the contours of the sidewalls ( 1 , 2 ), of the front portion ( 3 ), the rear portion ( 4 ), the at least one sidewall ( 5 , 6 ), the at least two cavities ( 7 , 8 , 9 ), and the guide elements ( 21 , 22 ) arising; and in a second step the blank is milled in a direction substantially perpendicular to the first direction; and in a third step, the markers are installed; and finishing follows in a fourth step.
Claim 25
Dependent Claim
99 words
24 . Process according to claim 23 , wherein, in the second step, the cage surfaces ( 10 , 11 ) are milled according to the first lordosis angle (@ 1 ), the tabular raised portions ( 24 , 25 , 26 , 27 ) are milled corresponding to the second lordosis angle (@ 2 ); and the beveled surfaces ( 23 , 23 @) of the front portion ( 3 ), the at least one opening ( 13 , 14 , 15 ) of the sidewall ( 1 ), and the first hole ( 20 ) are milled.
Claim 26
Dependent Claim
21 words
25 . Process according to claim 24 , wherein the first hole ( 20 ) is provided with an internal thread.
Claim 27
Dependent Claim
36 words
26 . Process according to one of claims 22 - 25 , wherein, in the third step, second holes ( 31 , 32 , 33 ) are formed for the markers, and the markers are inserted.
Claim 28
Dependent Claim
26 words
27 . Process according to one of claims 22 - 26 , wherein the final processing of the machine blank includes trovalization, marking, cleaning, and packaging.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.