US6080193A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable height fusion device
Assignee: Zimmer Spine Inc
•
Filing: 1998-09-15
•
Granted: 2000-06-27
•
Expires: 2018-09-15
Abstract
Abstract Method and apparatus for promoting a spinal fusion between neighboring vertebrae. The apparatus may be located in an intervertebral disc space and the apparatus preferably includes a pair of engaging plates for contacting the vertebrae. An alignment device of the apparatus may be used to alter the vertical distance between the engaging plates to customize the apparatus to fit a given patient. In an embodiment, the alignment device includes a rotatable connector and cam pins for adjusting the distance between the engaging plates. The alignment device is preferably adapted to vary the distance between the engaging plates such that the height of the apparatus proximate the anterior end is greater than the height of the apparatus proximate the posterior end whereby the natural lordosis of the spine is maintained after the apparatus is installed. The apparatus may further include a load-sharing member to allow stress to be imparted to bone in the vicinity of the apparatus to promote bone growth in accordance with Wolff's law.
Inventors
- 👤 Stephen H. Hochshuler
- 👤 Erik J. Wagner
- 👤 Ralph F. Rashbaum
- 👤 Richard D. Guyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:06
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/44; A61F2/4455; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/88; A61B17/8875; A61F2/30721; A61F2/30724; A61F2/30744; A61F2/3094; A61F2/30965; A61F2/442; A61F2/46; A61F2/4603; A61F2/4611; A61F2/28; A61F2002/2835; A61F2002/30001; A61F2002/30108; A61F2002/3011; A61F2002/30112; A61F2002/30131; A61F2002/30138; A61F2002/30143; A61F2002/30158; A61F2002/30159; A61F2002/30166; A61F2002/30199; A61F2002/30224; A61F2002/30261; A61F2002/30316; A61F2002/30317; A61F2002/30324; A61F2002/30326; A61F2002/30329; A61F2002/30331; A61F2002/30354; A61F2002/30362; A61F2002/3037; A61F2002/30383; A61F2002/30387; A61F2002/30405; A61F2002/30411; A61F2002/30476; A61F2002/30495; A61F2002/30507; A61F2002/30515; A61F2002/30535; A61F2002/30537; A61F2002/30538; A61F2002/3055; A61F2002/30556; A61F2002/30579; A61F2002/30593; A61F2002/30594; A61F2002/30604; A61F2002/30616; A61F2002/30621; A61F2002/30624; A61F2/30767; A61F2/30771; A61F2002/30772; A61F2002/30774; A61F2002/30777; A61F2002/30784; A61F2002/30785; A61F2002/30841; A61F2002/448; A61F2220/00; A61F2220/0025; A61F2220/0033; A61F2230/00; A61F2230/0002; A61F2230/0004; A61F2230/0013; A61F2230/0017; A61F2230/0026; A61F2230/0028; A61F2230/0063; A61F2230/0069; A61F2230/0082; A61F2250/00; A61F2250/0004; A61F2250/0006; A61F2250/0009; A61F2250/0014; A61F2250/0036; A61F2250/0037; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00017; A61F2310/00023; A61F2310/00179; Y; Y10; Y10S; Y10S606/00; Y10S606/907; Y10S606/909
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
162 words
A spinal implant for facilitating a fusion between neighboring vertebrae of a human spine, comprising: a first side opposite a second side; a pair of engaging plates adapted to fit between and engage the vertebrae to maintain a disk space between the vertebrae during use; a plurality of slots in each engaging plate, wherein each slot has at least one slanted section; a first pin and a second pin, wherein a portion of the first pin and a portion of the second pin are adapted to be positioned between the engaging plates on the slanted sections of the plurality of slot, the pins being substantially elongated and positioned to extend in a direction from the first side to the second side during use; and a connector for engaging the pins, wherein rotation of the connector causes movement of the first pin and the second pin along slanted sections of the slots to alter a separation distance between the engaging plates during use.
Claim 2
Dependent Claim
162 words
A spinal implant for facilitating a fusion between neighboring vertebrae of a human spine, comprising: a first side opposite a second side; a pair of engaging plates adapted to fit between and engage the vertebrae to maintain a disk space between the vertebrae during use; a plurality of slots in each engaging plate, wherein each slot has at least one slanted section; a first pin and a second pin, wherein a portion of the first pin and a portion of the second pin are adapted to be positioned between the engaging plates on the slanted sections of the plurality of slot, the pins being substantially elongated and positioned to extend in a direction from the first side to the second side during use; and a connector for engaging the pins, wherein rotation of the connector causes movement of the first pin and the second pin along slanted sections of the slots to alter a separation distance between the engaging plates during use.
Claim 3
Dependent Claim
21 words
The spinal implant of claim 1 wherein the engaging plates are substantially planar so as to inhibit subsidence of the vertebrae.
Claim 4
Dependent Claim
25 words
The spinal implant of claim 1 wherein the engaging plates comprise a plurality of openings to allow bone growth to occur through the engaging plates.
Claim 5
Dependent Claim
25 words
The spinal implant of claim 1 wherein the engaging plates comprise a plurality of openings, and further comprising bone graft packed between the engaging plates.
Claim 6
Dependent Claim
29 words
The spinal implant of claim 1, further comprising protrusions extending from at least one of the engaging plates for enhancing an engagement between the vertebra and the engaging plate.
Claim 7
Dependent Claim
23 words
The spinal implant of claim 1, further comprising a retaining plate proximate the posterior end for maintaining bone graft between the engaging plates.
Claim 8
Dependent Claim
24 words
The spinal implant of claim 1, further comprising a removable end cap proximate the anterior end for maintaining bone graft between the engaging plates.
Claim 9
Dependent Claim
61 words
The spinal implant of claim 1 wherein at least one of the engaging plates comprises a face and openings, the openings extending through the face to allow bone growth to occur through the engaging plate, and wherein the openings have a total area that is between about 60 percent and about 80 percent of a total surface area of the face.
Claim 10
Dependent Claim
58 words
The spinal implant of claim 1 wherein at least one of the engaging plates comprises a face and openings, the openings extending through the face to allow bone growth to occur through the engaging plate, and wherein the openings have a total area that is greater than about 50 percent of a total surface area of the face.
Claim 11
Dependent Claim
29 words
The spinal implant of claim 1 wherein the connector is a screw having a threaded portion, said threaded portion configured to engage a threaded portion of the first pin.
Claim 12
Dependent Claim
12 words
The spinal implant of claim 1 wherein the engaging plates comprise titanium.
Claim 13
Dependent Claim
40 words
The spinal implant of claim 1 wherein the engaging plates each further comprise a rib and a face, the rib extending in a substantially perpendicular direction from the face, the rib comprising the slot for receiving one of the pins.
Claim 14
Dependent Claim
23 words
The spinal implant of claim 1 wherein the engaging plates each further comprise a rib comprising the slot into which the pins extend.
Claim 15
Dependent Claim
47 words
The spinal implant of claim 1 wherein the connector is a screw adapted to move axially between the engaging plates, and wherein the screw further comprises a retaining ring for contacting a portion of at least one of the engaging plates to limit movement of the screw.
Claim 16
Dependent Claim
46 words
The spinal implant of claim 1 wherein the first pin comprises a threaded opening, and wherein the connector is a screw comprising a threaded portion and an unthreaded portion, the threaded portion extending through the threaded opening, the second pin being connected to the unthreaded portion.
Claim 17
Dependent Claim
60 words
The spinal implant of claim 1, further comprising an anterior end and a posterior end, and wherein the connector is adapted to move axially between the engaging plates in a direction from the anterior end to the posterior end, thereby moving the first pin toward the anterior end and the second pin toward the posterior end to increase the height.
Claim 18
Dependent Claim
52 words
The spinal implant of claim 1 wherein one of the slots comprises a first end and wherein the other slot comprises a second end, the first end and the second end extending in diverging directions, and wherein movement of one of the pins draws the first end and the second end together.
Claim 19
Dependent Claim
48 words
The spinal implant of claim 1 wherein the pins comprise an end and a receiving section, the end being disposed within one of the slots, the receiving section containing an opening for receiving the connector, the receiving section having a greater width than the end of the pin.
Claim 20
Dependent Claim
39 words
The spinal implant of claim 1 wherein the engaging plates each further comprise a rib and a face, the rib extending from the face in substantially perpendicular direction, and wherein the slot extends along a length of the rib.
Claim 21
Dependent Claim
39 words
The spinal implant of claim 1, further comprising an anterior end and a posterior end, and wherein movement of the pins alters the height proximate the anterior end at a faster rate than the height proximate the posterior end.
Claim 22
Dependent Claim
166 words
A spinal implant for facilitating a fusion between neighboring vertebrae of a human spine, comprising: a pair of engaging plates adapted to fit between and engage the vertebrae to maintain a disk space between the vertebrae during use; a plurality of ribs connected to each engaging plate, wherein the ribs provide a space and a separation distance between faces of the engaging plates; a plurality of slots in the ribs, each slot having at least one slanted section, a first pin positionable on slanted sections of the plurality of slots, the first pin configured to couple the pair of engaging plates together; a second pin positionable on slanted sections of the plurality of slots, the second pin configured to couple the pair of engaging plates together; and a connector coupled to the first pin and the second pin; wherein rotation of the connector causes movement of the pins along the slanted sections of the slots to alter the separation distance between the engaging plates during use.
Claim 23
Dependent Claim
166 words
A spinal implant for facilitating a fusion between neighboring vertebrae of a human spine, comprising: a pair of engaging plates adapted to fit between and engage the vertebrae to maintain a disk space between the vertebrae during use; a plurality of ribs connected to each engaging plate, wherein the ribs provide a space and a separation distance between faces of the engaging plates; a plurality of slots in the ribs, each slot having at least one slanted section, a first pin positionable on slanted sections of the plurality of slots, the first pin configured to couple the pair of engaging plates together; a second pin positionable on slanted sections of the plurality of slots, the second pin configured to couple the pair of engaging plates together; and a connector coupled to the first pin and the second pin; wherein rotation of the connector causes movement of the pins along the slanted sections of the slots to alter the separation distance between the engaging plates during use.
Claim 24
Dependent Claim
38 words
The spinal implant as defined in claim 21, wherein the faces of the engaging plates are configured to contact the vertebrae, and wherein the faces are substantially planar so as to inhibit subsidence of the vertebrae during use.
Claim 25
Dependent Claim
35 words
The spinal implant as defined in claim 21, further comprising at least one protrusion extending from at leas: one of the engaging plates for enhancing engagement between the vertebrae and the engaging plates during use.
Claim 26
Dependent Claim
26 words
The spinal implant as defined in claim 21, wherein the connector is a screw having a threaded portion configured to engage threading on the first pin.
Claim 27
Dependent Claim
40 words
The spinal implant as defined in claims 24, further comprising a retaining ring between an end of the screw and edges of the pair of engaging plates to inhibit movement of the end of the screw between the engaging plates.
Claim 28
Dependent Claim
25 words
The spinal implant as defined in claim 21, wherein at least one of the engaging plates further comprises openings, said openings extend through the face.
Claim 29
Dependent Claim
30 words
The spinal implant as defined in claim 26 wherein the openings have a total area that is greater than about 50 percent of a total surface area of the face.
Claim 30
Dependent Claim
33 words
The spinal implant as defined in claim 26, wherein the openings have a total area that is between about 60 percent and about 80 percent of a total surface area of the face.
Claim 31
Dependent Claim
17 words
The spinal implant as defined in claim 26, further comprising bone graft packed between the engaging plates.
References Cited (Backward Citations)
US4492226A
Cited
US4401112A
Cited
US4503848A
Cited
US4433677A
Cited
US4501269A
Cited
US4641636A
Cited
US4570618A
Cited
US4763644A
Cited
US4604995A
Cited
US4643178A
Cited
US4743256A
Cited
US4946458A
Cited
US5129904A
Cited
US4805602A
Cited
US4834757A
Cited
US4878915A
Cited
US5480437A
Cited
US4887596A
Cited
US5047029A
Cited
US5593409A
Cited
US5484437A
Cited
US5505732A
Cited
US5785710A
Cited
US4950269A
Cited
US5005562A
Cited
US5522899A
Cited
US5609635A
Cited
US5108399A
Cited
US5026373A
Cited
US4961740A
Cited
US4961740B1
Cited
US5147359A
Cited
US5201734A
Cited
US5074864A
Cited
US5154718A
Cited
US5116340A
Cited
US4966600A
Cited
US5129388A
Cited
US5192321A
Cited
US4987892A
Cited
US5489308A
Cited
US5344422A
Cited
US5055104A
Cited
US5176680A
Cited
US5290494A
Cited
US5651789A
Cited
US5360431A
Cited
US5474555A
Cited
US5102412A
Cited
US5181917A
Cited
US5127912A
Cited
US5108446A
Cited
US5303718A
Cited
US5171278A
Cited
US5123926A
Cited
US5390683A
Cited
US5693100A
Cited
US5336240A
Cited
US5176678A
Cited
US5713903A
Cited
US5192327A
Cited
US5563124A
Cited
US5527341A
Cited
US5658516A
Cited
US5306307A
Cited
US5242448A
Cited
US5385583A
Cited
US5290312A
Cited
US5603713A
Cited
US5242445A
Cited
US5246442A
Cited
US5263953A
Cited
US5261909A
Cited
US5360429A
Cited
US5357983A
Cited
US5569248A
Cited
US5704936A
Cited
US5403315A
Cited
US5306309A
Cited
US5423825A
Cited
US5318566A
Cited
US5281222A
Cited
US5312405A
Cited
US5688279A
Cited
US5348026A
Cited
US5545165A
Cited
US5667506A
Cited
US5380325A
Cited
US5700292A
Cited
US5702395A
Cited
US5616144A
Cited
US5549612A
Cited
US5653709A
Cited
US5312410A
Cited
US5653708A
Cited
US5609592A
Cited
US5628756A
Cited
US5496318A
Cited
US5676701A
Cited
US5336223A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-06-27 | 2003-12-27 | 2004-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-06-27 | 2007-12-27 | 2008-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-06-27 | 2011-12-27 | 2012-06-27 | $7700.00 | Window Closed / Lapsed |