Patent US5961522A successfully refreshed from Google Patents.
US5961522A
Expired / Lapsed
US
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Laminectomy chisel and guide apparatus
Assignee: Individual
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Filing: 1997-11-10
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Granted: 1999-10-05
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Expires: 2017-11-10
Abstract
Abstract A set of bone chisels is disclosed for use in laminectomy procedures wherein portions of the lamina, facet, and pedicle have to be removed for successful performance of the surgery. The chisels are shaped for use in conjunction with a tubular nerve root retractor which also spreads or spaces vertebral bodies in accordance with some surgical procedures.
Inventors
- 👤 Hamid M. Mehdizadeh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:11
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/16; A61B17/1662; A61B17/1671; A61B17/1604
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
178 words
A bone chisel and guide for use in laminectomy procedures, comprising a nerve root retractor and disc space spreader having a tubular body, said tubular body having an inside diameter, a proximal end, a distal end, and a tang extending from said distal end having a length and width for entering an intradiscal space between vertabral bodies and for contacting adjacent vertebral bodies and maintaining a disc space therebetween, a chisel body having a length extending through said tubular body inside diameter and having a proximal end and a distal end, said chisel body being configured for passage through said tubular body inside diameter and for extension of said proximal and distal ends from said tubular body proximal and distal ends respectively, said chisel body length providing extension of said chisel body distal end to positions adjacent said tang, cutting means on said chisel body distal end, said cutting means having a curvature substantially in conformance with the curvature of said tubular body inside diameter, and means on said chisel body proximal end for manipulating said cutting edge.
Claim 2
Dependent Claim
178 words
A bone chisel and guide for use in laminectomy procedures, comprising a nerve root retractor and disc space spreader having a tubular body, said tubular body having an inside diameter, a proximal end, a distal end, and a tang extending from said distal end having a length and width for entering an intradiscal space between vertabral bodies and for contacting adjacent vertebral bodies and maintaining a disc space therebetween, a chisel body having a length extending through said tubular body inside diameter and having a proximal end and a distal end, said chisel body being configured for passage through said tubular body inside diameter and for extension of said proximal and distal ends from said tubular body proximal and distal ends respectively, said chisel body length providing extension of said chisel body distal end to positions adjacent said tang, cutting means on said chisel body distal end, said cutting means having a curvature substantially in conformance with the curvature of said tubular body inside diameter, and means on said chisel body proximal end for manipulating said cutting edge.
Claim 3
Dependent Claim
47 words
The bone chisel and guide of claim 1 wherein said chisel body comprises a longitudinal section having outside dimensions substantially smaller than the tubular body inside diameter, whereby the tubular body and said longitudinal section are formed to depart from coaxial relationship for maneuvering said cutting means.
Claim 4
Dependent Claim
47 words
The bone chisel and guide of claim 2 wherein said cutting means comprises a cutting blade extending from said chisel body distal end, said cutting blade having a cutting edge lying substantially in one plane and a blade curvature substantially fitting within the tubular body inside diameter.
Claim 5
Dependent Claim
20 words
The bone chisel and guide of claim 1 wherein said means for manipulating said cutting edge comprises an impact cap.
Claim 6
Dependent Claim
44 words
The bone chisel and guide of claim 1 wherein said chisel body comprises a longitudinal member having an outside dimension for sliding contact with the tubular body inside diameter, whereby the tubular body and said longitudinal member are held in a substantially coaxial relationship.
Claim 7
Dependent Claim
24 words
The bone chisel and guide of claim 5 wherein said cutting means comprises a curved serrated cutting edge on said chisel body distal end.
Claim 8
Dependent Claim
27 words
The bone chisel and guide of claim 6 wherein said means for manipulating comprises a T-shaped handle for imparting rotational motion to said curved serrated cutting edge.
Claim 9
Dependent Claim
28 words
The bone chisel and guide of claim 5 wherein said cutting means comprises a curved cutting edge lying substantially in one plane on said longitudinal member distal end.
Claim 10
Dependent Claim
17 words
The bone chisel and guide of claim 8 wherein said means for manipulating comprises an impact cap.
Claim 11
Dependent Claim
127 words
Chisel and guide apparatus for removal of bone from ones of adjacent vertabral bodies during laminectomy procedures, comprising a tubular body having an inside diameter, a proximal end and a distal end, a tang extending from said distal end, said tang having a length and width for contacting adjacent vertabral bodies and for entering vertabral body intradiscal space to maintain a predetermined space therebetween, a chisel body formed to extend through said tubular body inside diameter and having a proximal end and a distal end, said chisel body proximal end extending from said tubular body proximal end for longitudinal and rotational manipulation, said chisel body being formed for maneuverability of said chisel body distal end adjacent said tang, and cutting means on said chisel body distal end.
Claim 12
Dependent Claim
127 words
Chisel and guide apparatus for removal of bone from ones of adjacent vertabral bodies during laminectomy procedures, comprising a tubular body having an inside diameter, a proximal end and a distal end, a tang extending from said distal end, said tang having a length and width for contacting adjacent vertabral bodies and for entering vertabral body intradiscal space to maintain a predetermined space therebetween, a chisel body formed to extend through said tubular body inside diameter and having a proximal end and a distal end, said chisel body proximal end extending from said tubular body proximal end for longitudinal and rotational manipulation, said chisel body being formed for maneuverability of said chisel body distal end adjacent said tang, and cutting means on said chisel body distal end.
Claim 13
Dependent Claim
21 words
Apparatus as in claim 10, comprising means on said chisel body proximal end for manipulating said cutting means longitudinally and rotationally.
Claim 14
Dependent Claim
24 words
Apparatus as in claim 10 wherein said chisel body has an outside diameter providing a substantially sliding fit with said tubular body inside diameter.
Claim 15
Dependent Claim
14 words
Apparatus as in claim 10; wherein said cutting means comprises a serrated cutting edge.
Claim 16
Dependent Claim
138 words
Apparatus for removal of bone from selected portions of adjacent vertabral bodies during lamenectomy procedures wherein the vertebral bodies have a vertabral disc space therebetween, comprising a tubular body having a proximal end and a distal end and having an inside diameter, tang means attached to said tubular body distal end, said tang means having a width for contacting and spacing the adjacent vertabral bodies and for entering the vertabral disc space, chisel means having a chisel body for extending through said tubular body with a distal end extending from said tubular body distal end to positions adjacent said tang means, said chisel means further having a proximal end extending from said tubular body proximal end, means for manipulating said chisel means mounted on said chisel means proximal end, and cutting means on said chisel means distal end.
Claim 17
Dependent Claim
138 words
Apparatus for removal of bone from selected portions of adjacent vertabral bodies during lamenectomy procedures wherein the vertebral bodies have a vertabral disc space therebetween, comprising a tubular body having a proximal end and a distal end and having an inside diameter, tang means attached to said tubular body distal end, said tang means having a width for contacting and spacing the adjacent vertabral bodies and for entering the vertabral disc space, chisel means having a chisel body for extending through said tubular body with a distal end extending from said tubular body distal end to positions adjacent said tang means, said chisel means further having a proximal end extending from said tubular body proximal end, means for manipulating said chisel means mounted on said chisel means proximal end, and cutting means on said chisel means distal end.
Claim 18
Dependent Claim
25 words
The apparatus of claim 14, comprising an outside diameter on said chisel body that provides a substantially sliding fit with said tubular body inside diameter.
Claim 19
Dependent Claim
13 words
The apparatus of claim 14, wherein said cutting means comprises a serrated edge.
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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) | 2002-10-04 | 2003-04-05 | 2003-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-10-04 | 2007-04-05 | 2007-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-10-04 | 2011-04-05 | 2011-10-05 | $7700.00 | Window Closed / Lapsed |