US5865845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prosthetic intervertebral disc
Assignee: Individual
•
Filing: 1996-03-05
•
Granted: 1999-02-02
•
Expires: 2016-03-05
Abstract
Abstract The invention provides a spinal disc implant comprising a ring shaped body including a first pair of opposed substantially parallel sides spaced apart by a second pair of opposed sides to define a central bore. A first one of the second pair of sides defines a substantially arcuate curve joining a first end of the first pair of sides. A second one of the second pair of opposed sides substantially linearly joins a second end of the first pair of sides. The upper and lower surfaces of the ring shaped body have a plurality of teeth extending therefrom for engaging adjacent vertebrae. The implant is made of a biocompatible metal such as titanium or an alloy thereof, and the first and second sides tapering from the second end to the first end. The interior space may have a porous hydroxyapatite block shaped to fill the interior space. The porous hydroxyapatite substance helps the prosthesis integrate into the vertebral structure by allowing one grow into the pores.
Inventors
- 👤 John S. Thalgott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:26
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/44; A61F2/442; A61F2/4455; A61F2/4465; A61F2/46; A61F2/4603; A61F2/4611; A61F2/28; A61F2/30767; A61F2/30771; A61F2002/30001; A61F2002/30108; A61F2002/3011; A61F2002/30112; A61F2002/30113; A61F2002/30115; A61F2002/30138; A61F2002/30158; A61F2002/30182; A61F2002/30187; A61F2002/30199; A61F2002/30224; A61F2002/30228; A61F2002/3023; A61F2002/30261; A61F2002/30266; A61F2002/30316; A61F2002/30329; A61F2002/30476; A61F2002/30507; A61F2002/30535; A61F2002/30593; A61F2002/30604; A61F2002/30616; A61F2002/30772; A61F2002/30777; A61F2002/30795; A61F2002/30841; A61F2002/30843; A61F2002/30878; A61F2002/30891; A61F2002/30892; A61F2002/4635; A61F2220/00; A61F2220/0025; A61F2230/00; A61F2230/0002; A61F2230/0004; A61F2230/0006; A61F2230/0017; A61F2230/0026; A61F2230/0028; A61F2230/0034; A61F2230/0063; A61F2230/0069; A61F2230/0082; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00023; A61F2310/00179; A61F2310/00293
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
138 words
A spinal disc implant comprising a ring-shaped body including a first pair of opposed substantially parallel sides spaced apart by a second pair of opposed sides to define a central bore, a first one of the second pair of sides defining a substantially arcuate curve joining a first end of the first pair of sides, a second one of the second pair of opposed sides joining a second end of the first pair of sides, upper and lower surfaces of the ring-shaped body having a plurality of teeth extending therefrom along a perimeter of the implant for engaging the adjacent vertebral bodies, the implant being made of a bicompatible metal; the first and second sides tapering from the second end to the first end and conforming to a curvature of a vertebral body on which the implant rests.
Claim 2
Dependent Claim
138 words
A spinal disc implant comprising a ring-shaped body including a first pair of opposed substantially parallel sides spaced apart by a second pair of opposed sides to define a central bore, a first one of the second pair of sides defining a substantially arcuate curve joining a first end of the first pair of sides, a second one of the second pair of opposed sides joining a second end of the first pair of sides, upper and lower surfaces of the ring-shaped body having a plurality of teeth extending therefrom along a perimeter of the implant for engaging the adjacent vertebral bodies, the implant being made of a bicompatible metal; the first and second sides tapering from the second end to the first end and conforming to a curvature of a vertebral body on which the implant rests.
Claim 3
Dependent Claim
16 words
A spinal disc implant in accordance with claim 1 wherein the ring-shaped body is substantially oval.
Claim 4
Dependent Claim
16 words
A spinal disc implant in accordance with claim 1 wherein the ring-shaped body is substantially D-shaped.
Claim 5
Dependent Claim
18 words
A spinal disc implant in accordance with claim 3 wherein the biocompatible metal is titanium or alloys thereof.
Claim 6
Dependent Claim
24 words
A spinal disc implant in accordance with claim 3 wherein the central bore includes a porous hydroxyapatite block shaped to fill the central bore.
Claim 7
Dependent Claim
37 words
A spinal disc implant in accordance with claim 5 wherein the upper and lower surfaces of the ring-shaped body are convexly curved to mate with surfaces of adjacent endplates of vertebrae between which the implant is inserted.
Claim 8
Dependent Claim
41 words
A spinal disc implant in accordance with claim 5, wherein the implant includes a hole formed in the ring-shaped body, and further comprising a screw inserted in the hole for fixing the hydroxyapatite block in the central bore of the implant.
Claim 9
Dependent Claim
34 words
A spinal disc implant in accordance with claim 3 wherein the upper and lower surfaces of the ring-shaped body are curved to mate with adjacent endplates of vertebrae between which the implant is inserted.
Claim 10
Dependent Claim
171 words
A spinal disc implant having a generally elongated D-shaped body, the body tapering in thickness from a first end to a second end along first and second faces thereof, a degree of taper and thickness to allow the implant to fit within a cavity created by removal of a diseased or damaged vertebral disc and defined by an angle formed by adjacent vertebral bodies from between which the vertebral disc is removed, said spinal disc implant being of titanium or an alloy thereof and having a central bore open to first and second faces thereof being filled by a porous hydroxyapatite block shaped to substantially fill the central bore, the spinal disc implant additionally having a plurality of teeth projecting along the perimeter of the D-shaped body on the first and second faces for engaging bony and soft tissue of adjacent vertebrae, the teeth encircling the hydroxyapatite block and the second face convexly curved to mate with an overlying or underlying surface of a vertebral body on which the implant rests.
Claim 11
Dependent Claim
171 words
A spinal disc implant having a generally elongated D-shaped body, the body tapering in thickness from a first end to a second end along first and second faces thereof, a degree of taper and thickness to allow the implant to fit within a cavity created by removal of a diseased or damaged vertebral disc and defined by an angle formed by adjacent vertebral bodies from between which the vertebral disc is removed, said spinal disc implant being of titanium or an alloy thereof and having a central bore open to first and second faces thereof being filled by a porous hydroxyapatite block shaped to substantially fill the central bore, the spinal disc implant additionally having a plurality of teeth projecting along the perimeter of the D-shaped body on the first and second faces for engaging bony and soft tissue of adjacent vertebrae, the teeth encircling the hydroxyapatite block and the second face convexly curved to mate with an overlying or underlying surface of a vertebral body on which the implant rests.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-02-01 | 2002-08-03 | 2003-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-02-01 | 2006-08-03 | 2007-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-02-01 | 2010-08-03 | 2011-02-02 | $7700.00 | Window Closed / Lapsed |