US4520797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Collateral ligament retractor
Assignee: Zimmer Technology Inc
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Filing: 1983-07-15
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Granted: 1985-06-04
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Expires: 2003-07-15
Abstract
Abstract A collateral ligament retractor includes a first member having a cupped arcuate finger member for insertion into the knee joint, along and partly around the tibal plateau and a curved portion extending from the finger outward around the ligament extending back substantially in the same direction as the finger and including a downwardly extending pivoted elongated arm extending to a position behind the knee above the calf with a second member being of similar design but larger to accommodate the everted patella positioned around the opposite ligament and a tension member in the form of a coil spring connected to the outer end of the arms of the members for biasing the arms toward one another for holding the ligaments in a retracted position.
Inventors
- 👤 Thomas D. Petersen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:42
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
179 words
A collateral ligament retractor assembly for retracting a pair of collateral ligaments for aiding and providing acess to a knee structure for knee surgery, comprising: a pair of substantially symmetrical individually manipulable retractor members, each retractor member defined by generally S-shaped lever means including curved finger means formed at one end thereof for independent insertion between a collateral ligament and a tibia plateau and partially encircling and extending behind and engaging the tibia plateau thereby providing fulcrum means comprising a pivot point about which said retractor member pivots in use, and including curved arm means curving around past said one end to a position outside the collateral ligament and terminating at a position behind and to one side of said one end and said tibia, and tension means connected between the arm means of said retractor members behind a knee structure after said retractor members have each been independently inserted in place said tension means pivoting said retractor members about their fulcrum means thereby holding the ligaments in a retracted position away from the tibia for providing access thereto.
Claim 2
Dependent Claim
179 words
A collateral ligament retractor assembly for retracting a pair of collateral ligaments for aiding and providing acess to a knee structure for knee surgery, comprising: a pair of substantially symmetrical individually manipulable retractor members, each retractor member defined by generally S-shaped lever means including curved finger means formed at one end thereof for independent insertion between a collateral ligament and a tibia plateau and partially encircling and extending behind and engaging the tibia plateau thereby providing fulcrum means comprising a pivot point about which said retractor member pivots in use, and including curved arm means curving around past said one end to a position outside the collateral ligament and terminating at a position behind and to one side of said one end and said tibia, and tension means connected between the arm means of said retractor members behind a knee structure after said retractor members have each been independently inserted in place said tension means pivoting said retractor members about their fulcrum means thereby holding the ligaments in a retracted position away from the tibia for providing access thereto.
Claim 3
Dependent Claim
52 words
The collateral ligament retractor assembly of claim 1 wherein each of said lever means includes pivoting arm means pivotally connected to an end of said curved arm means remote from said finger means and pivotable to variable positions out of the common plane including said finger means and said curved arm means.
Claim 4
Dependent Claim
27 words
The collateral ligament retractor of claim 2 wherein said tension means is a coil spring releasably connected between outer ends of each of said pivoting arm means.
Claim 5
Dependent Claim
23 words
The collateral ligament retractor of claim 1 wherein said curved finger means is generally cupped in configuration by curving about two separate axes.
Claim 6
Dependent Claim
240 words
A collateral ligament retractor assembly for retracting a pair of collateral ligaments for providing access to a knee for knee surgery, comprising: a pair of substantially symmetrical individually manipulable retractor members, each retractor member defined by generally S-shaped lever means having curved finger means at one end for independent insertion between a collateral ligaments and a tibia plateau and partially encircling and extending behind and engaging the tibia plateau thereby providing fulcrum means defining a pivot point about which said retractor member may pivot in use, and each retractor member including curved arm means for curving around the collateral ligament and past said one end to a position outside the collateral ligament and extending to and terminating at a positions behind and to one side of the tibia, and of said one end, said curved arm means includes a pivoting arm pivotally connected to and end of said curved arm means remote from said finger means and pivotable to variable positions out of a common plane of said finger means and said curved arm means, and coil spring means releaseably connected between the respective pivoting arms of said retractor members after said retractor members have each been independently inserted in place between the respective ligaments and tibia, said coil spring means biasing said retractor members and causing them to pivot about their fulcrum means and holding the ligaments in a retracted position away from the tibia to provide access thereto.
Claim 7
Dependent Claim
240 words
A collateral ligament retractor assembly for retracting a pair of collateral ligaments for providing access to a knee for knee surgery, comprising: a pair of substantially symmetrical individually manipulable retractor members, each retractor member defined by generally S-shaped lever means having curved finger means at one end for independent insertion between a collateral ligaments and a tibia plateau and partially encircling and extending behind and engaging the tibia plateau thereby providing fulcrum means defining a pivot point about which said retractor member may pivot in use, and each retractor member including curved arm means for curving around the collateral ligament and past said one end to a position outside the collateral ligament and extending to and terminating at a positions behind and to one side of the tibia, and of said one end, said curved arm means includes a pivoting arm pivotally connected to and end of said curved arm means remote from said finger means and pivotable to variable positions out of a common plane of said finger means and said curved arm means, and coil spring means releaseably connected between the respective pivoting arms of said retractor members after said retractor members have each been independently inserted in place between the respective ligaments and tibia, said coil spring means biasing said retractor members and causing them to pivot about their fulcrum means and holding the ligaments in a retracted position away from the tibia to provide access thereto.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-03 | 1988-12-03 | 1989-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-03 | 1992-12-03 | 1993-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-03 | 1996-12-03 | 1997-06-04 | $7700.00 | Window Closed / Lapsed |