US5308349A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for performing knee surgery and retractors for use therein
Assignee: Individual
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Filing: 1992-12-09
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Granted: 1994-05-03
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Expires: 2012-12-09
Abstract
Abstract A method of performing knee surgery and retractors and a femoral distractor for use in performing such method are provided, said retractors including a PCL tibial retractor, lateral patellar retractor, collateral ligament retractor, posterior cruciate ligament retractor and unicompartmental retractor designed to cooperate with one another in performing such method.
Inventors
- 👤 W. F. Michael Mikhail
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:11
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/02; A61B17/025; A61B2017/0268
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
136 words
An unicompartmental retractor for use in performing knee surgery comprising: (a) a handle having a longitudinal axis and having a flat section defining a first plane and, (b) an integral tip extending from said handle and having first, second and third sections, said first section having a planar portion disposed at an angle between 43.5°0 and 46.5° to said first plane, said second section following an arcuate path having a radius between 1.3 inches and 1.7 inches and said third section following a straight line path disposed at an angle of 5° ±2°0 to a second plane perpendicular to said first plane and extending in a direction away from said handle and terminating below said first plane such that the included angle between said path straight line and said first plane is between 83° and 87°.
Claim 2
Dependent Claim
136 words
An unicompartmental retractor for use in performing knee surgery comprising: (a) a handle having a longitudinal axis and having a flat section defining a first plane and, (b) an integral tip extending from said handle and having first, second and third sections, said first section having a planar portion disposed at an angle between 43.5°0 and 46.5° to said first plane, said second section following an arcuate path having a radius between 1.3 inches and 1.7 inches and said third section following a straight line path disposed at an angle of 5° ±2°0 to a second plane perpendicular to said first plane and extending in a direction away from said handle and terminating below said first plane such that the included angle between said path straight line and said first plane is between 83° and 87°.
Claim 3
Dependent Claim
99 words
An unicompartmental retractor for use in performing knee surgery comprising: (a) a handle having a flat section defining a plane; and, (b) an integral tip extending from said flat section and cooperating therewith to define a line of juncture, said tip having first and second adjoining sections, said first section having a planar portion disposed at an angle between 43.5° and 46.5° to said plane such that the included angle between said flat section and said planar portion is between 133.5° and 136.5°, said second section following an arcuate path having a radius between 1.2 inches and 1.8 inches.
Claim 4
Dependent Claim
99 words
An unicompartmental retractor for use in performing knee surgery comprising: (a) a handle having a flat section defining a plane; and, (b) an integral tip extending from said flat section and cooperating therewith to define a line of juncture, said tip having first and second adjoining sections, said first section having a planar portion disposed at an angle between 43.5° and 46.5° to said plane such that the included angle between said flat section and said planar portion is between 133.5° and 136.5°, said second section following an arcuate path having a radius between 1.2 inches and 1.8 inches.
Claim 5
Dependent Claim
41 words
An unicompartmental retractor according to claim 2, wherein said arcuate path has a center of radius located on the opposite side of said plane from said integral tip and on the opposite side of said line of juncture from said handle.
Claim 6
Dependent Claim
36 words
An unicompartmental retractor according to claim 3, wherein said tip has edges disposed toward each other at an angle between 8° and 12° and said third section has a length between 0.28 inch and 0.32 inch.
Claim 7
Dependent Claim
32 words
An unicompartmental retractor according to claim 4, wherein the end of said third section has a breadth between 0.28 inch and 0.32 inch and a thickness between 0.04 inch and 0.08 inch.
Claim 8
Dependent Claim
59 words
An unicompartmental retractor according to claim 2, wherein said arcuate path has a center of radius located on the opposite side of said plane from said integral tip by a distance between 0.33 inch and 0.37 inch and on the opposite side of said line of juncture from said handle by a distance between 2.21 inches and 2.31 inches.
Claim 9
Dependent Claim
52 words
An unicompartmental retractor according to claim 2, wherein said integral tip includes a third section extending from said second section, said third section extending in a path toward said plane and tapering away from said handle such that the included angle between said path and said plane is between 83° and 87°.
Claim 10
Dependent Claim
158 words
An unicompartmental retractor for use in performing knee surgery comprising: (a) a handle having a flat section defining a first plane; and, (b) an integral tip extending from said flat section and cooperating therewith to define a line of juncture, said tip having first, second and third adjoining sections, said first section having a planar portion adjacent said line of juncture and disposed at an angle between 43.5° and 46.5° to said first plane such that the included angle between said first plane and said planar portion is between 133.5° and 136.5°, said section following an arcuate path having a radius between 1.3 inches and 1.7 inches and said third section extending in a path directed toward said first plane and tapering away from said handle at an angle of 5° ±2° to a second plane perpendicular to said first plane such that the included angle between said path and said first plane is between 83° and 87°.
Claim 11
Dependent Claim
158 words
An unicompartmental retractor for use in performing knee surgery comprising: (a) a handle having a flat section defining a first plane; and, (b) an integral tip extending from said flat section and cooperating therewith to define a line of juncture, said tip having first, second and third adjoining sections, said first section having a planar portion adjacent said line of juncture and disposed at an angle between 43.5° and 46.5° to said first plane such that the included angle between said first plane and said planar portion is between 133.5° and 136.5°, said section following an arcuate path having a radius between 1.3 inches and 1.7 inches and said third section extending in a path directed toward said first plane and tapering away from said handle at an angle of 5° ±2° to a second plane perpendicular to said first plane such that the included angle between said path and said first plane is between 83° and 87°.
Claim 12
Dependent Claim
42 words
An unicompartmental retractor according to claim 8, wherein said arcuate path has a center of radius located on the opposite said of said first plane from said integral tip and on the opposite side of said line of junction from said handle.
Claim 13
Dependent Claim
60 words
An unicompartmental retractor according to claim 8, wherein said arcuate path has a center of radius located on the opposite side of said first plane from said integral tip by a distance between 0.33 inch and 0.37 inch and on the opposite side of said line of juncture from said handle by a distance between 2.21 inches and 2.31 inches.
Claim 14
Dependent Claim
31 words
An unicompartmental retractor according to claim 8, wherein said third section terminates at an end, said end being positioned on the same side of said first plane as said second section.
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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) | 1997-05-02 | 1997-11-01 | 1998-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-05-02 | 2001-11-01 | 2002-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-05-02 | 2005-11-01 | 2006-05-03 | $7700.00 | Window Closed / Lapsed |