US5697977A
Expired / Lapsed
US
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Method and apparatus for spondylolisthesis reduction
Assignee: Individual
•
Filing: 1995-06-07
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Granted: 1997-12-16
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Expires: 2015-06-07
Abstract
Abstract Method and apparatus for reduction of spondylolisthesis involving the insertion of an elongate implant which is split longitudinally into two side-by-side members, one of which is movable relative to the other, into the disk space between two misaligned vertebrae. Each of the members is provided with teeth for engaging the adjacent vertebrae and positioned on the members so as to be located on opposite sides of the implant. The implant formed by the two side-by-side members is generally rectangularly-shaped in cross section, the height of the rectangularly-shaped cross section being less than the width so that the implant can be inserted between the adjacent vertebrae with the lesser, height dimension oriented in the same direction as the axis of the spinal column and the larger width dimension at approximately a right angle to that axis. One of the two members is then moved relative to the other from the first position in which the members are in the abovedescribed, side-by-side relationship along the longitudinal axis of the implant to a second position in which the members are aligned with the respective, adjacent, misaligned vertebrae and the implant is then rotated by approximately 90° to cause the teeth to contact the bodies of the adjacent vertebrae. The two members are then brought back into the first side-by-side relationship to draw the misaligned vertebrae into alignment and the implant is rotated approximately 90° to disengage the teeth from the vertebrae for removal of the implant from the disk space.
Inventors
- 👤 Madhavan Pisharodi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:51
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/02; A61B17/025; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/44; A61F2/4455; A61F2/446; A61F2/46; A61F2/4603; A61F2/4611; A61B2017/0256; A61F2/3094; A61F2/30965; A61F2/442; A61F2/28; A61F2002/2835; A61F2002/30001; A61F2002/30108; A61F2002/3011; A61F2002/30159; A61F2002/30169; A61F2002/30199; A61F2002/30205; A61F2002/30214; A61F2002/30224; A61F2002/30252; A61F2002/30253; A61F2002/30286; A61F2002/30316; A61F2002/30329; A61F2002/30331; A61F2002/30362; A61F2002/3037; A61F2002/30383; A61F2002/3039; A61F2002/30398; A61F2002/30405; A61F2002/30426; A61F2002/30433; A61F2002/30535; A61F2002/30537; A61F2002/30553; A61F2002/30579; A61F2002/30593; A61F2002/30594; A61F2/30767; A61F2/30771; A61F2002/30772; A61F2002/30777; A61F2002/30795; A61F2002/30797; A61F2002/3085; A61F2002/30873; A61F2002/30878; A61F2002/30879; A61F2002/4625; A61F2002/4627; A61F2002/4629; A61F2220/00; A61F2220/0025; A61F2220/0033; A61F2220/0041; A61F2230/00; A61F2230/0002; A61F2230/0028; A61F2230/0047; A61F2230/0063; A61F2230/0067; A61F2230/0069; A61F2230/0073; A61F2230/0076; A61F2250/00; A61F2250/0004; A61F2250/0008; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00023
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
134 words
A method of aligning adjacent vertebrae after removing a portion of the intervertebral disk from therebetween to form a disk space comprising the steps of: inserting an elongate body having means formed on opposite sides thereof for selectively engaging the vertebrae adjacent the disk space into the disk space, the body being comprised of first and second side-by-side members, with the vertebrae engaging means extending into the disk space without engaging the adjacent vertebrae; moving the second member relative to the first member until the first and second members are approximately aligned with each of the adjacent vertebrae; rotating the body approximately 90° to cause the vertebrae engaging means thereon to engage the vertebrae; and moving the second member relative to the first member to align the vertebrae to which each member is engaged.
Claim 2
Independent Claim
134 words
A method of aligning adjacent vertebrae after removing a portion of the intervertebral disk from therebetween to form a disk space comprising the steps of: inserting an elongate body having means formed on opposite sides thereof for selectively engaging the vertebrae adjacent the disk space into the disk space, the body being comprised of first and second side-by-side members, with the vertebrae engaging means extending into the disk space without engaging the adjacent vertebrae; moving the second member relative to the first member until the first and second members are approximately aligned with each of the adjacent vertebrae; rotating the body approximately 90° to cause the vertebrae engaging means thereon to engage the vertebrae; and moving the second member relative to the first member to align the vertebrae to which each member is engaged.
Claim 3
Dependent Claim
24 words
The method of claim 1 wherein the first and second members are moved by moving a mandrel to which the second member is mounted.
Claim 4
Dependent Claim
56 words
The method of claim 1 wherein the body is elongate and wider in the middle portion than at the ends thereof and the first and second members are aligned with the adjacent vertebrae by positioning at the point relative to the adjacent vertebrae at which the respective wider middle portions maximally engage the respective adjacent vertebrae.
Claim 5
Dependent Claim
53 words
The method of claim 1 wherein the body is substantially rectangularly-shaped in cross section, the sides of the body defining a height of smaller dimension than the dimension of the sides defining the width of the body, the vertebrae engaging means being formed on the sides of the body defining the height thereof.
Claim 6
Dependent Claim
24 words
The method of claim 1 wherein the body is inserted into the disk space on one side of the center of the adjacent vertebrae.
Claim 7
Dependent Claim
20 words
The method of claim 1 additionally comprising replacing the first body with a monolithic implant after aligning the adjacent vertebrae.
Claim 8
Dependent Claim
16 words
The method of claim 6 additionally comprising replacing the second body with a second monolithic implant.
Claim 9
Independent Claim
257 words
A method of aligning adjacent vertebrae after removing portions of the intervertebral disk from therebetween to form first and second disk spaces on the sides of the center thereof comprising the steps of: inserting a first elongate body having means formed thereon for selectively engaging the vertebrae adjacent the disk space into the first disk space, the first body being comprised of first and second side-by-side members; moving the second member of the first body relative to the first member of the first body to a position in which the first and second members of the first body are approximately aligned with the adjacent vertebrae; rotating the first body approximately 90° to cause the vertebrae engaging means formed thereon to engage the adjacent vertebrae; moving the second member of the first body relative to the first member of the first body to align the adjacent vertebrae; inserting a second elongate body having means formed thereon for selectively engaging the adjacent vertebrae into the second disk space, the second implant being comprised of first and second side-by-side members; moving the second member of the second body relative to the first member of the second body to a position in which the first and second members of the second body are approximately aligned with the adjacent vertebrae; rotating the second body approximately 90° to cause the vertebrae engaging means formed thereon to engage the adjacent vertebrae; and moving the second member of the second body relative to the first member of the second body to align the adjacent vertebrae.
Claim 10
Independent Claim
257 words
A method of aligning adjacent vertebrae after removing portions of the intervertebral disk from therebetween to form first and second disk spaces on the sides of the center thereof comprising the steps of: inserting a first elongate body having means formed thereon for selectively engaging the vertebrae adjacent the disk space into the first disk space, the first body being comprised of first and second side-by-side members; moving the second member of the first body relative to the first member of the first body to a position in which the first and second members of the first body are approximately aligned with the adjacent vertebrae; rotating the first body approximately 90° to cause the vertebrae engaging means formed thereon to engage the adjacent vertebrae; moving the second member of the first body relative to the first member of the first body to align the adjacent vertebrae; inserting a second elongate body having means formed thereon for selectively engaging the adjacent vertebrae into the second disk space, the second implant being comprised of first and second side-by-side members; moving the second member of the second body relative to the first member of the second body to a position in which the first and second members of the second body are approximately aligned with the adjacent vertebrae; rotating the second body approximately 90° to cause the vertebrae engaging means formed thereon to engage the adjacent vertebrae; and moving the second member of the second body relative to the first member of the second body to align the adjacent vertebrae.
Claim 11
Dependent Claim
31 words
The method of claim 8 wherein the first and second members of the first and second bodies are moved by moving a mandrel to which the respective second members are mounted.
Claim 12
Dependent Claim
24 words
The method of claim 8 wherein the first and second elongate bodies are wider in the respective middle portions than at the ends thereof.
Claim 13
Dependent Claim
62 words
The method of claim 8 wherein the first and second elongate bodies are substantially rectangularly-shaped in cross section, the sides of the respective bodies defining the height being of smaller dimension than the dimension of the sides defining the width of the respective bodies, and the vertebrae engaging means are formed on the sides of the respective bodies defining the height thereof.
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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) | 2000-12-15 | 2001-06-16 | 2001-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-12-15 | 2005-06-16 | 2005-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-12-15 | 2009-06-16 | 2009-12-16 | $7700.00 | Window Closed / Lapsed |