US2002138144A1PendingUtilityA1
Threaded frusto-conical interbody spinal fusion implants
Priority: Feb 17, 1995Filed: Jan 16, 2002Published: Sep 26, 2002
Est. expiryFeb 17, 2015(expired)· nominal 20-yr term from priority
Inventors:Gary K. Michelson
A61F 2/4603A61F 2002/30593A61F 2/4637A61F 2002/30604A61F 2002/4627A61F 2002/30795A61F 2002/3021A61F 2002/30405A61F 2002/30879A61F 2002/4681A61F 2002/30777A61F 2/4611A61F 2002/448A61F 2002/30143A61F 2002/4629A61B 2017/922A61F 2002/30906A61B 17/1757A61F 2/30767A61B 17/8875A61F 2230/001A61F 2002/30909A61F 2002/4649A61F 2310/00017A61B 17/32A61F 2/4657A61F 2002/2835A61B 2090/036A61B 17/1671A61F 2002/30808A61F 2230/0069A61F 2002/3013A61F 2230/0017A61F 2002/30894A61F 2002/449A61F 2002/30892A61F 2002/30148A61F 2220/0025A61F 2310/00976A61F 2002/30217A61F 2310/00029A61F 2002/30062A61F 2002/30131A61F 2002/30426A61F 2002/30797A61F 2002/30785A61F 2002/30904A61B 17/3468A61F 2002/4619A61B 17/025A61F 2002/30224A61F 2/30744A61F 2002/30774A61F 2230/0013A61F 2250/0063A61F 2002/30861A61F 2/30771A61F 2230/0067A61F 2002/30836A61F 2002/30235A61F 2002/3085A61F 2310/00293A61F 2310/00023A61F 2/446A61F 2310/00796A61F 2002/3081A61B 2017/0256A61F 2210/0004A61F 2/442A61F 2002/30787A61F 5/04
46
PatentIndex Score
0
Cited by
0
References
0
Claims
Abstract
The present invention is directed to a variety of interbody spinal fusion implants having at least a partially frusto-conical configuration. An external thread is employed to increase implant stability and implant surface area, and for the purpose of advancing the spinal fusion implant into the fusion site. The spinal fusion implants of the present invention may be relatively solid or hollow and may have surface roughenings to promote bone ingrowth and stability. The spinal fusion implants of the present invention may have wells extending into the material of the implant from the surface for the purpose of holding fusion promoting materials and to provide for areas of bone ingrowth fixation.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1 . A frusto-conical interbody spinal fusion implant, comprising:
a body having an insertion end, a trailing end and an outer surface; and an external thread for engaging said implant to adjacent vertebrae of the spine, the outer locus of said external thread forming a substantially frusto-conical configuration, said implant being made of a material appropriate for human implantation.
2 . The implant of claim 1 in which said body has a substantially frusto-conical configuration.
3 . The implant of claim 1 in which said body has a substantially cylindrical configuration.
4 . The spinal fusion implant of claim 1 in which said trailing end is larger than said insertion end.
5 . The spinal fusion implant of claim 1 in which said insertion end is larger than said trailing end.
6 . The spinal fusion implant of claim 1 in which said implant comprises a bone ingrowth material.
7 . The spinal fusion implant of claim 1 in which said implant comprises a fusion promoting material.
8 . The spinal fusion implant of claim 1 in which said implant is at least in part bioabsorbable.
9 . The spinal fusion implant of claim 1 having a plurality of openings capable retaining fusion promoting material.
11 . The spinal fusion implant of claim 1 in which said external thread has a thread radius measured from the longitudinal central axis of said implant, said thread radius being substantially uniform throughout at least a portion of said implant.
12 . The spinal fusion implant of claim 1 in which said external thread has a thread radius measured from the longitudinal central axis of said implant, said thread radius being variable along the length of said implant.
13 . The spinal fusion implant of claim 1 in which said external thread has a thread height measured from said body which is variable along the length of said implant.
14 . The spinal fusion implant of claim 1 in which said external thread has a thread height measured from said body which is substantially constant along the length of said implant.
15 . The spinal fusion implant of claim 1 in which .said outer surface is porous at least in part.
16 . The spinal fusion implant of claim 1 in which said implant has an internal chamber and an access opening for accessing said internal chamber.
17 . The spinal fusion implant of claim 16 in which said internal chamber is capable of containing fusion promoting material.
18 . The spinal fusion implant of claim 16 in which said implant comprises a wall surrounding said internal chamber.
19 . The spinal fusion implant of claim 16 in which said wall has a plurality of openings passing therethrough in communication with said internal chamber.
20 . The spinal fusion implant of claim 16 in which said implant has means for closing said access opening.
21 . The spinal fusion implant of claim 1 in which said implant includes an engagement means for engaging instrumentation for the insertion of said implant.
22 . The spinal fusion implant of claim 1 in which at least a portion of said outer surface comprises wells having at least partial walls.
23 . The spinal fusion implant of claim 1 in which said implant is configured to be placed in close proximity in a side by side alignment to a second spinal fusion implant, said first and second implants when placed together having a combined overall width that is less than the sum of the individual maximum diameters of each of said first and second implants.
24 . The spinal fusion implant of claim 1 having a longitudinal central axis and at least one truncated side forming a planar surface parallel to said central axis.
25 . The spinal fusion implant of claim 24 in which said external thread has a thread height measured from said body which is greatest at said truncated side.
26 . A frusto-conical interbody spinal fusion implant, comprising:
a body having an insertion end, a trailing end and an outer surface; and an external thread for engaging said implant to adjacent vertebrae of the spine, the locus of said external thread forming a substantially cylindrical configuration, said implant being made of a material appropriate for human implantation.
27 . The implant of claim 26 in which said body has a substantially frusto-conical configuration.
28 . The implant of claim 26 in which said body has at least in part a cylindrical configuration.
29 . The spinal fusion implant of claim 26 in which said trailing end is larger than said insertion end.
30 . The spinal fusion implant of claim 26 in which said insertion end is larger than said trailing end.
31 . The spinal fusion implant of claim 26 in which said implant comprises a bone ingrowth material.
32 . The spinal fusion implant of claim 26 in which said implant comprises a fusion promoting material.
33 . The spinal fusion implant of claim 26 in which said implant is at least in part bioabsorbable.
34 . The spinal fusion implant of claim 26 having a plurality of openings capable retaining fusion promoting material.
35 . The spinal fusion implant of claim 26 in which said external thread has a thread radius measured from the longitudinal central axis of said implant, said thread radius being substantially uniform throughout the length of said implant.
36 . The spinal fusion implant of claim 26 in which said external thread has a thread radius measured from the longitudinal central axis of said implant, said thread radius being variable along at least a portion of said implant.
37 . The spinal fusion implant of claim 26 in which said external thread has a thread height measured from said body which is variable along the length of said implant.
38 . The spinal fusion implant of claim 26 in which said external thread has a thread height measured from said body which is substantially constant along at least a portion of said implant.
39 . The spinal fusion implant of claim 26 in which said outer surface is porous at least in part.
40 . The spinal fusion implant of claim 26 in which said implant has an internal chamber and an access opening for accessing said internal chamber.
41 . The spinal fusion implant of claim 26 in which said internal chamber is capable of containing fusion promoting material.
42 . The spinal fusion implant of claim 40 in which said implant comprises a wall surrounding said internal chamber.
43 . The spinal fusion implant of claim 40 in which said wall has a plurality of openings passing therethrough in communication with said internal chamber.
44 . The spinal fusion implant of claim 40 in which said implant has means for closing said access opening.
45 . The spinal fusion implant of claim 26 in which one of said ends of said implant includes an engagement means for engaging instrumentation for the insertion of said implant.
46 . The spinal fusion implant of claim 26 in which at least a portion of said outer surface comprises wells having at least partial walls.
47 . The spinal fusion implant of claim 26 in which said implant is configured to be placed in close proximity in a side by side alignment to a second spinal fusion implant, said first and second implants when placed together having a combined overall width that is less than the sum of the individual maximum diameters of each of said first and second implants.
48 . The spinal fusion implant of claim 26 having a longitudinal central axis and at least one truncated side forming a planar surface parallel to said central axis.
49 . The spinal fusion implant of claim 48 in which said external thread has a thread height measured from said body which is greatest at said truncated side.
50 . An interbody spinal fusion implant, comprising:
a body having a substantially cylindrical configuration, an insertion end, a trailing end and an outer surface; and an external thread for engaging said implant to adjacent vertebrae of th e locus of said external thread forming a substantially cylindrical configuration, said implant being made of a material appropriate for human implantation.
51 . The spinal fusion implant of claim 50 in which said implant comprises a bone ingrowth material.
52 . The spinal fusion implant of claim 50 in which said implant comprises a fusion promoting material.
53 . The spinal fusion implant of claim 50 in which said implant is at least in part bioabsorbable
54 . The spinal fusion implant of claim 50 having a plurality of openings capable retaining fusion promoting material.
55 . The spinal fusion implant of claim 50 in which said external thread has a thread radius measured from the longitudinal central axis of said implant, said thread radius being substantially uniform for at least a portion of said implant.
56 . The spinal fusion implant of claim 50 in which said external thread has a thread radius measured from the longitudinal central axis of said implant, said thread radius being variable along at least a portion of said implant.
57 . The spinal fusion implant of claim 50 in which said external thread has a thread height measured from said body which is variable along at least a portion of said implant.
58 . The spinal fusion implant of claim 50 in which said external thread has a thread height measured from said body which is substantially constant along the length of said implant.
59 . The spinal fusion implant of claim 51 in which said outer surface is porous at least in part.
60 . The spinal fusion implant of claim 51 in which said in has an internal chamber and an access opening for accessing said internal chamber.
61 . The spinal fusion implant of claim 60 in which said internal chamber is capable of containing fusion promoting material.
62 . The spinal fusion implant of claim 60 in which said implant comprises a wall surrounding said internal chamber.
63 . The spinal fusion implant of claim 60 in which said wall has a plurality of openings passing therethrough in communication with said internal chamber.
64 . The spinal fusion implant of claim 60 in which said implant has means for closing said access opening.
65 . The spinal fusion implant of claim 51 in which one of said ends of said implant includes an engagement means for engaging instrumentation for the insertion of said implant.
66 . The spinal fusion implant of claim 51 in which at least a portion of said outer surface comprises wells having at least partial walls.
67 . The spinal fusion implant of claim 51 in which said implant is configured to be placed in close proximity in a side by side alignment to a second spinal fusion implant, said first and second implants when placed together having a combined overall width that is less than the sum of the individual maximum diameters of each of said first and second implants.
68 . The spinal fusion implant of claim 51 having a longitudinal central axis and at least one truncated side forming a planar surface parallel to said central axis.
69 . The spinal fusion implant of claim 68 in which said external thread has a thread height measured from said body which is greatest at said truncated side.
70 . A frusto-conical interbody spinal fusion implant, comprising:
a body having a substantially frusto-conical configuration, an insertion end, a trailing end and an outer surface; and an external thread for engaging said implant to adjacent vertebrae of the spine, said implant being made of a material appropriate for human implantation.
71 . The implant of claim 70 in which said the outer locus of said external thread forms a substantially cylindrical configuration.
72 . The spinal fusion implant of claim 70 in which said insertion end is larger than said trailing end.
73 . The spinal fusion implant of claim 72 in which said insertion end comprises a tapered leading portion.
74 . The spinal fusion implant of claim 70 in which said trailing end is larger than said insertion end.
75 . The spinal fusion implant of claim 70 in which said implant comprises a bone ingrowth material.
76 . The spinal fusion implant of claim 70 in which said implant comprises a fusion promoting material.
77 . The spinal fusion implant of claim 70 in which said implant is at least in part bioabsorbable.
78 . The spinal fusion implant of claim 70 having a plurality of openings capable retaining fusion promoting material.
79 . The spinal fusion implant of claim 70 in which said external thread has a thread radius measured from the longitudinal central axis of said implant, said thread radius being substantially uniform throughout the length of said implant.
80 . The spinal fusion implant of claim 70 in which said external thread has a thread radius measured from the longitudinal central axis of said implant, said thread radius being variable along the length of said implant.
81 . The spinal fusion implant of claim 70 in which said external thread has a thread height measured from said body which is variable along the length of said implant.
82 . The spinal fusion implant of claim 70 in which said external thread has a thread height measured from said body which is substantially constant along the length of said implant.
83 . The spinal fusion implant of claim 70 in which said outer surface is porous at least in part.
84 . The spinal fusion implant of claim 70 in which said implant has an internal chamber and an access opening for accessing said internal chamber.
85 . The spinal fusion implant of claim 84 in which said internal chamber is capable of containing fusion promoting material.
86 . The spinal fusion implant of claim 84 in which said implant comprises a wall surrounding said internal chamber.
87 . The spinal fusion implant of claim 84 in which said wall has a plurality of openings passing therethrough in communication with said internal chamber.
88 . The spinal fusion implant of claim 84 in which said implant has means for closing said access opening.
89 . The spinal fusion implant of claim 70 in which one of said ends of said implant includes an engagement means for engaging instrumentation for the insertion of said implant.
90 . The spinal fusion implant of claim 70 in which at least a portion of said outer surface comprises wells having at least partial walls.
91 . The spinal fusion implant of claim 70 in which said implant is configured to be placed in close proximity in a side by side alignment to a second spinal fusion implant, said first and second implants when placed together having a combined overall width that is less than the sum of the individual maximum diameters of each of said first and second implants.
92 . The spinal fusion implant of claim 70 having a longitudinal central axis and at least one truncated side forming a planar surface parallel to said central axis.
93 . The spinal fusion implant of claim 92 in which said external thread has a thread height measured from said body which is greatest at said truncated side.
94 . The spinal, fusion implant of claim 1 in which said implant has an upper and lower portion for engaging the bone of the adjacent vertebrae, said upper and lower surfaces comprising a plurality of macroscopic openings.
95 . The spinal fusion implant of claim 26 in which said implant has an upper and lower portion for engaging the bone of the adjacent vertebrae, said upper and lower surfaces comprising plurality of macroscopic openings.
96 . The spinal fusion implant of claim 50 in which said implant has an upper and lower portion for engaging the bone of the adjacent vertebrae, said upper and lower surfaces comprising a plurality of macroscopic openings.
97 . The spinal fusion implant of claim 70 in which said implant has an upper and lower portion for engaging the bone of the adjacent vertebrae, said upper and lower surfaces comprising a plurality of macroscopic openings.
98 . The spinal fusion implant of claim 24 in which said external thread is continuous over at least a portion of said truncated side.Join the waitlist — get patent alerts
Track US2002138144A1 — get alerts on status changes and closely related new filings.
We store only your email — no account needed. See our privacy policy.