Patent US3297994A successfully refreshed from Google Patents.
US4621630A
Expired / Lapsed
US
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Guide for femoral neck osteotomy
Assignee: Howmedica Osteonics Corp
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Filing: 1983-04-15
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Granted: 1986-11-11
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Expires: 2003-04-15
Abstract
Abstract A guide for femoral neck osteotomy comprises a longitudinal rod having attaching structure at the lower end thereof for securing the rod to a femur at the greater trochanter. A transversely extending support arm is secured to the rod adjacent the lower end thereof, and a guide bar is connected to the support arm. The guide bar has at least one elongate planar surface disposed at an angle of 45° to the axis of the rod. In use, the rod is aligned with the long shaft axis of the femur and attached to the femur at the greater trochanter. The rod is manipulated until the support arm and the long shaft axis of the tibia are disposed in the same plane. This procedure properly positions the elongate planar surface of the guide bar whereby an instrument in engagement with that surface traverses the femoral neck at an angle of 45° to the long shaft axis of the femur.
Inventors
- 👤 Robert V. Kenna
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:12
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/14; A61B17/15
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
118 words
A guide for femoral neck osteotomy, comprising a longitudinal rod having attaching means at the lower end thereof for securing the longitudinal rod to a femur at the greater trochanter, a tranversely extending support arm secured to the longitudinal rod adjacent the lower end thereof, a guide bar connected to the support arm having at least one elongate planar surface downwardly and outwardly extending at an angle of 45° to the axis of the longitudinal rod, and a keyed connection between the support arm and the guide bar whereby the guide bar is free to slide laterally on the support arm toward and away from the longitudinal rod but is prevented from rotating relative to the support arm.
Claim 2
Dependent Claim
118 words
A guide for femoral neck osteotomy, comprising a longitudinal rod having attaching means at the lower end thereof for securing the longitudinal rod to a femur at the greater trochanter, a tranversely extending support arm secured to the longitudinal rod adjacent the lower end thereof, a guide bar connected to the support arm having at least one elongate planar surface downwardly and outwardly extending at an angle of 45° to the axis of the longitudinal rod, and a keyed connection between the support arm and the guide bar whereby the guide bar is free to slide laterally on the support arm toward and away from the longitudinal rod but is prevented from rotating relative to the support arm.
Claim 3
Dependent Claim
30 words
A guide as in claim 1 wherein the support arm has a semicircular cross section and the guide bar includes a semicircular bore for mating engagement with the support arm.
Claim 4
Dependent Claim
22 words
A guide as in claim 1 wherein the guide bar includes two elongate planar surfaces spaced from and parallel to each other.
Claim 5
Dependent Claim
18 words
A guide as in claim 3 wherein the elongate planar surfaces comprise opposite surfaces on the guide bar.
Claim 6
Dependent Claim
34 words
A guide as in claim 1 wherein the guide bar includes a downwardly extending interconnecting portion between the elongate planar surface and the point of connection of the guide bar to the support arm.
Claim 7
Dependent Claim
13 words
A guide as in claim 1 wherein the attaching means comprises a spike.
Claim 8
Dependent Claim
18 words
A guide as in claim 1 including a strike plate at the upper end of the longitudinal rod.
Claim 9
Dependent Claim
53 words
A guide as in claim 1 including a straight edge connected to and outwardly extending from the guide bar for locating the center of a femoral head, the straight edge means extending at an angle of 90° to a reference plane defined by the axes of the support arm and the longitudinal rod.
Claim 10
Dependent Claim
42 words
A guide as in claim 8 wherein the lower end of the longitudinal rod includes a transverse flat surface and the point of connection of the straight edge to the guide bar is at the same elevation as the transverse flat surface.
Claim 11
Dependent Claim
37 words
A guide as in claim 1 including a transversely disposed alignment bar connected to the longitudinal rod at the upper end portion thereof and extending at an angle of 90° to the axis of the support arm.
Claim 12
Independent Claim
151 words
A method for removal of the neck and head of a femur, comprising the steps of aligning the longitudinal axis of a rod with the long shaft axis of the femur; attaching the rod to the femur at the greater trochanter; positioning a transverse support arm secured to the rod at the lower end portion thereof so that the axis of the support arm and the long shaft axis of the tibia are disposed in the same plane: providing a guide bar on the support arm having an elongate planar surface downwardly and outwardly extending at an angle of 45° to the longitudinal axis of the rod; and guiding a cutting instrument against the femoral neck while the instrument is in engagement with the elongate planar surface on the guide bar, whereby the instrument traverses the femoral neck at an angle of 45° to the long shaft axis of the femur.
Claim 13
Independent Claim
151 words
A method for removal of the neck and head of a femur, comprising the steps of aligning the longitudinal axis of a rod with the long shaft axis of the femur; attaching the rod to the femur at the greater trochanter; positioning a transverse support arm secured to the rod at the lower end portion thereof so that the axis of the support arm and the long shaft axis of the tibia are disposed in the same plane: providing a guide bar on the support arm having an elongate planar surface downwardly and outwardly extending at an angle of 45° to the longitudinal axis of the rod; and guiding a cutting instrument against the femoral neck while the instrument is in engagement with the elongate planar surface on the guide bar, whereby the instrument traverses the femoral neck at an angle of 45° to the long shaft axis of the femur.
Claim 14
Dependent Claim
77 words
A method as in claim 11 including the further step of positioning a transversely disposed alignment bar connected to the upper end portion of the rod 90° out of phase with the axis of the support arm so that a plane passing through the axis of the alignment bar and the longitudinal axis of the rod is perpendicular to the plane defined by the long shaft axis of the tibia and the axis of the support arm.
Claim 15
Dependent Claim
116 words
A guide for femoral neck osteotomy, comprising a longitudinal rod having attaching means at the lower end thereof for securing the longitudinal rod to a femur at the greater trochanter, a transversely extending support arm secured to the longitudinal rod adjacent the lower end thereof, and a guide bar connected to the support arm having at least one elongate planar surface downwardly and outwardly extending at an angle of 45° to the axis of the longitudinal rod, the lower end of the longitudinal rod including a transverse flat surface and the attaching means comprising a spike downwardly extending from the transverse flat surface and having a longitudinal axis aligned with the axis of the longitudinal rod.
Claim 16
Dependent Claim
116 words
A guide for femoral neck osteotomy, comprising a longitudinal rod having attaching means at the lower end thereof for securing the longitudinal rod to a femur at the greater trochanter, a transversely extending support arm secured to the longitudinal rod adjacent the lower end thereof, and a guide bar connected to the support arm having at least one elongate planar surface downwardly and outwardly extending at an angle of 45° to the axis of the longitudinal rod, the lower end of the longitudinal rod including a transverse flat surface and the attaching means comprising a spike downwardly extending from the transverse flat surface and having a longitudinal axis aligned with the axis of the longitudinal rod.
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) | 1989-11-10 | 1990-05-12 | 1990-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-10 | 1994-05-12 | 1994-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-10 | 1998-05-12 | 1998-11-11 | $7700.00 | Window Closed / Lapsed |