Patent DE1126073B successfully refreshed from Google Patents.
US5702455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expandable prosthesis for spinal fusion
Assignee: Individual
•
Filing: 1996-07-03
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Granted: 1997-12-30
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Expires: 2016-07-03
Abstract
Abstract A spine stabilizing prosthesis has first and second hollow, cylindrical bearing members interconnected by a hollow, cylindrical jacking screw adjustable to expand the prosthesis within a cavity to bridge respective opposite axial ends of the bearing members into pressure engagement with opposing vertebral faces. Walls of the bearing members are perforated by a plurality of bone fragment admitting apertures and forming a bone fragment receptacle so that bone can grow and fuse completely through said bearing members when the prosthesis is installed in the cavity. Respective axial ends of the bearing members are formed with rings of vertebrae engaging teeth having ramp surfaces permitting sliding engagement when rotated in one direction and biting into the facing surfaces when rotated in the opposite direction resisting rotation to permit further expansion apart of the bearing members by rotation of the jacking screw.
Inventors
- 👤 Rahul Saggar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:38
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/44; A61F2/4455; A61F2/4465; A61B; A61B17/00; A61B17/064; A61B17/0642; A61B17/56; A61B17/58; A61B17/68; A61B17/70; A61B2017/0647; A61F2/30721; A61F2/30744; A61F2/46; A61F2/4603; A61F2/4611; A61F2/28; A61F2002/2835; A61F2002/30001; A61F2002/30108; A61F2002/3011; A61F2002/30138; A61F2002/30146; A61F2002/30199; A61F2002/30224; A61F2002/30235; A61F2002/30316; A61F2002/30329; A61F2002/30405; A61F2002/30411; A61F2002/30433; A61F2002/30476; A61F2002/30507; A61F2002/30535; A61F2002/30537; A61F2002/3055; A61F2002/30593; A61F2002/30601; A61F2/30767; A61F2/30771; A61F2002/30772; A61F2002/30774; A61F2002/30784; A61F2002/30785; A61F2002/30787; A61F2002/30789; A61F2002/30818; A61F2002/30841; A61F2220/00; A61F2220/0025; A61F2220/0041; A61F2230/00; A61F2230/0002; A61F2230/0017; A61F2230/0063; A61F2230/0069; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00017; A61F2310/00023
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
164 words
A spine stabilizing prosthesis for insertion between respective facing surfaces of respective vertebral portions above and below a cavity caused by removal of a portion of vertebra comprising: first and second bearing members having respective remote, outer ends for bearing against said respective facing surfaces and respective adjacent inner ends; jacking screw adjustment means rotatively interconnecting respective adjacent inner ends of respective bearing members for relative rotation to adjust separation of said bearing members to bridge the cavity; said jacking screw adjustment means comprises a single tubular shaft having a medial, tool engageable portion and opposite open ends formed with respective threads which are opposite, complementary opposite threads being formed on said first and said second bearing portions; and, said bearing members having tubular, axially extending walls perforated by a plurality of bone fragment admitting apertures forming a bone fragment receptacle so that bone can grow and fuse through said bearing members and said tubular shaft when the prosthesis is installed in the cavity.
Claim 2
Dependent Claim
164 words
A spine stabilizing prosthesis for insertion between respective facing surfaces of respective vertebral portions above and below a cavity caused by removal of a portion of vertebra comprising: first and second bearing members having respective remote, outer ends for bearing against said respective facing surfaces and respective adjacent inner ends; jacking screw adjustment means rotatively interconnecting respective adjacent inner ends of respective bearing members for relative rotation to adjust separation of said bearing members to bridge the cavity; said jacking screw adjustment means comprises a single tubular shaft having a medial, tool engageable portion and opposite open ends formed with respective threads which are opposite, complementary opposite threads being formed on said first and said second bearing portions; and, said bearing members having tubular, axially extending walls perforated by a plurality of bone fragment admitting apertures forming a bone fragment receptacle so that bone can grow and fuse through said bearing members and said tubular shaft when the prosthesis is installed in the cavity.
Claim 3
Dependent Claim
65 words
A prosthesis according to claim 1 wherein, said respective remote, outer ends are formed with respective first and second rings of teeth for bearing against said respective facing surfaces, said teeth having ramp surfaces permitting sliding engagement with said facing surfaces when a respective bearing member is rotated in one rotational direction and biting into said facing surfaces when rotated in an opposite rotational direction.
Claim 4
Dependent Claim
262 words
A spine stabilizing prosthesis for insertion between respective facing surfaces of respective vertebral portions above and below a cavity caused by removal of a portion of vertebra comprising: first and second bearing portions having respective remote, outer ends and respective adjacent inner ends; said respective remote, outer ends being formed with respective first and second rings of teeth for bearing against said respective facing surfaces; jacking screw adjustment means rotatively interconnecting respective adjacent inner ends of respective bearing portions so that said bearing portions and said jacking screw adjustment means can be rotated relatively about a ring axis to adjust separation of said bearing portions to bridge the cavity; said teeth having ramp surfaces permitting sliding engagement with said facing surfaces in one rotational direction and biting into said surfaces in an opposite rotational direction; and, said jacking screw adjustment means comprising a single shaft having a medial, tool engageable portion and opposite ends formed with respective threads which are opposite, complementary opposite threads being formed on said first and said second bearing portions, so that, with the prosthesis inserted in the cavity with bearing portions aligned with respective facing surfaces, at least one of the bearing portions can be rotated in a first sense relative to the shaft to increase the axial length of the prosthesis until spanning the cavity with the rings of teeth in sliding engagement with respective surfaces and the tool engageable portion then rotated in an opposite sense to urge the bearing portions further apart and thereby drive the teeth into anchoring engagement with the respective surfaces.
Claim 5
Dependent Claim
262 words
A spine stabilizing prosthesis for insertion between respective facing surfaces of respective vertebral portions above and below a cavity caused by removal of a portion of vertebra comprising: first and second bearing portions having respective remote, outer ends and respective adjacent inner ends; said respective remote, outer ends being formed with respective first and second rings of teeth for bearing against said respective facing surfaces; jacking screw adjustment means rotatively interconnecting respective adjacent inner ends of respective bearing portions so that said bearing portions and said jacking screw adjustment means can be rotated relatively about a ring axis to adjust separation of said bearing portions to bridge the cavity; said teeth having ramp surfaces permitting sliding engagement with said facing surfaces in one rotational direction and biting into said surfaces in an opposite rotational direction; and, said jacking screw adjustment means comprising a single shaft having a medial, tool engageable portion and opposite ends formed with respective threads which are opposite, complementary opposite threads being formed on said first and said second bearing portions, so that, with the prosthesis inserted in the cavity with bearing portions aligned with respective facing surfaces, at least one of the bearing portions can be rotated in a first sense relative to the shaft to increase the axial length of the prosthesis until spanning the cavity with the rings of teeth in sliding engagement with respective surfaces and the tool engageable portion then rotated in an opposite sense to urge the bearing portions further apart and thereby drive the teeth into anchoring engagement with the respective surfaces.
Claim 6
Dependent Claim
11 words
A prosthesis according to claim 3 wherein, said shaft is tubular.
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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) | 2000-12-29 | 2001-06-30 | 2001-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-12-29 | 2005-06-30 | 2005-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-12-29 | 2009-06-30 | 2009-12-30 | $7700.00 | Window Closed / Lapsed |