US4657550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Buttressing device usable in a vertebral prosthesis
Assignee: Individual
•
Filing: 1986-01-16
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Granted: 1987-04-14
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Expires: 2006-01-16
Abstract
Abstract A device for maintaining the normal spacing between two vertebrae defining, in the vertebral column, the ends of a cavity resulting from the removal of at least a part of a vertebra comprises two bases each having means for anchorage in one of said end vertebrae; and adjustable buttressing means connecting said bases together.
Inventors
- 👤 Youssef H. Daher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:51
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/46; A61F2/4603; A61F2/4611; A61F2/44; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/84; A61B17/86; A61B17/8695; A61F2002/30001; A61F2002/30108; A61F2002/3011; A61F2002/30138; A61F2002/30154; A61F2002/30199; A61F2002/30224; A61F2002/30235; A61F2002/30316; A61F2002/30329; A61F2002/30331; A61F2002/30362; A61F2002/30364; A61F2002/30367; A61F2002/30405; A61F2002/30411; A61F2002/30476; A61F2002/30507; A61F2002/30535; A61F2002/30537; A61F2002/3055; A61F2002/30601; A61F2/30767; A61F2/30771; A61F2002/30772; A61F2002/30784; A61F2002/30785; A61F2002/30787; A61F2002/30841; A61F2002/30878; A61F2002/30891; A61F2002/30892; A61F2220/00; A61F2220/0025; A61F2220/0033; A61F2230/00; A61F2230/0002; A61F2230/0017; A61F2230/0021; A61F2230/0063; A61F2230/0069
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
180 words
A device for maintaining the normal spacing between two vertebrae defining, in the vertebral column, the ends of a cavity resulting from the removal of at least a part of a vertebra, said device comprising: buttressing means including a connecting piece in the form of an elongated nut and a pair of threaded rods engaging said nut, each rod having a free end extending from said nut, said rods being movable with respect to each other in the connecting piece in a direction parallel to the axis of the vertebral column, and anchorage means including a base provided with a plurality of anchorage points, said base being attached to each of said free ends for anchoring said device between said vertebrae, at least one of said bases being removably attached to its associated free end by connecting means including a tenon on one of said free end and said associated base and a mortice on the other of said free end and said base, said mortice and said tenon having corresponding cross-sections such that said tenon fits into said mortice.
Claim 2
Independent Claim
180 words
A device for maintaining the normal spacing between two vertebrae defining, in the vertebral column, the ends of a cavity resulting from the removal of at least a part of a vertebra, said device comprising: buttressing means including a connecting piece in the form of an elongated nut and a pair of threaded rods engaging said nut, each rod having a free end extending from said nut, said rods being movable with respect to each other in the connecting piece in a direction parallel to the axis of the vertebral column, and anchorage means including a base provided with a plurality of anchorage points, said base being attached to each of said free ends for anchoring said device between said vertebrae, at least one of said bases being removably attached to its associated free end by connecting means including a tenon on one of said free end and said associated base and a mortice on the other of said free end and said base, said mortice and said tenon having corresponding cross-sections such that said tenon fits into said mortice.
Claim 3
Dependent Claim
27 words
The device of claim 1 wherein said free end is in the form of a tenon and said base is provided with a mortice of corresponding cross-section.
Claim 4
Dependent Claim
14 words
A device in accordance with claim 2, wherein said tenon has a polygonal cross-section.
Claim 5
Dependent Claim
19 words
A device in accordance with claim 3, wherein said tenon has a cross-section which is at least substantially square.
Claim 6
Dependent Claim
20 words
A device in accordance with claim 1 further including a washer adjacent each base and fitted in said anchorage points.
Claim 7
Dependent Claim
19 words
A device in accordance with claim 1, wherein said connecting piece is provided with internal threads of opposite directions.
Claim 8
Dependent Claim
25 words
A device in accordance with claim 1, wherein means are provided at both ends of said connecting piece for locking said buttressing elements in position.
Claim 9
Dependent Claim
27 words
A device in accordance with claim 1, wherein a plurality of orifices are provided in said connecting piece adapted to receive means for rotating said connecting piece.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-04-13 | 1990-10-13 | 1991-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-13 | 1994-10-13 | 1995-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-13 | 1998-10-13 | 1999-04-14 | $7700.00 | Window Closed / Lapsed |