US4704128A
Expired / Lapsed
US
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Anchoring shank for an endoprosthesis
Assignee: Zimmer GmbH
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Filing: 1984-07-18
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Granted: 1987-11-03
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Expires: 2004-07-18
Abstract
Abstract The anchoring shank is provided in the proximal region with a rib structure formed of alternating rib crests and troughs. The troughs extend at an angle of inclination to the longitudinal axis of the shank of from 1° to 10° while the rib crests extend at a greater angle of inclination of from 2° to 12°. The troughs and rib crests, each have cross-sectional profiles which are curvilinear while the side walls of each rib are flat. In one embodiment, the radius of curvature of the troughs increase in the distal direction while the radius of curvature of the rib crests decrease in the distal direction.
Inventors
- 👤 Otto Frey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:22
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/32; A61F2/36; A61F2/3662; A61F2/367; A61F2/30767; A61F2/30771; A61F2002/30001; A61F2002/30108; A61F2002/3011; A61F2002/30138; A61F2002/30156; A61F2002/3082; A61F2002/30827; A61F2002/30828; A61F2002/30878; A61F2002/30879; A61F2002/30884; A61F2002/30891; A61F2002/30892; A61F2230/00; A61F2230/0002; A61F2230/0017; A61F2230/0023
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
83 words
An anchoring shank for an endoprosthesis having a longitudinal axis, and a rib structure on at least one surface thereof parallel to said axis, said rib structure including alternating rib crests and troughs, said troughs extending at a first angle of inclination to said axis of from 1° to 10° and said rib crests extending at a second angle of inclination to said axis of from 2° to 12° , whereby the first angle is smaller than the second angle in any case.
Claim 2
Dependent Claim
83 words
An anchoring shank for an endoprosthesis having a longitudinal axis, and a rib structure on at least one surface thereof parallel to said axis, said rib structure including alternating rib crests and troughs, said troughs extending at a first angle of inclination to said axis of from 1° to 10° and said rib crests extending at a second angle of inclination to said axis of from 2° to 12° , whereby the first angle is smaller than the second angle in any case.
Claim 3
Dependent Claim
22 words
An anchoring shank as set forth in claim 1 wherein said rib structure is disposed in a proximal region of said shank.
Claim 4
Dependent Claim
27 words
An anchoring shank as set forth in claim 1 wherein said first angle is from 2° to 5° and said second angle is from 4° to 8°.
Claim 5
Dependent Claim
54 words
An anchoring shank as set forth in claim 1 wherein said rib crests and said troughs each have a cross-sectional profile selected from one of a circular, elliptical and oval cross-sectional profile and wherein each rib crest has a rounded profile extending over a circular sector of a third angle between 2/3π and π.
Claim 6
Dependent Claim
61 words
An anchoring shank as set forth in claim 4 wherein the distance between two adjacent centers of curvature of a trough and an adjacent rib crest parallel to said shank surface is at least equal to the sum of the radii of curvature of said trough and said rib crest multiplied by the cosine of 90° minus one-half said third angle.
Claim 7
Dependent Claim
41 words
An anchoring shank as set forth in claim 5 wherein each said trough has an increasing radius of curvature towards a distal end of said shank and each said rib crest has a decreasing radius of curvature towards said distal end.
Claim 8
Dependent Claim
81 words
An anchoring shank for an endoprosthesis having a longitudinal axis, a pair of opposite side surfaces and a rib structure on each side surface at a proximal end thereof, each rib structure including alternating rib crests and troughs, said troughs extending at a first angle of inclination α to said axis of 1°≦α≦10° and each rib crest extending at a second angle of inclination β to said axis greater than said angle of said troughs and in a range of 2°≦β≦12°.
Claim 9
Dependent Claim
81 words
An anchoring shank for an endoprosthesis having a longitudinal axis, a pair of opposite side surfaces and a rib structure on each side surface at a proximal end thereof, each rib structure including alternating rib crests and troughs, said troughs extending at a first angle of inclination α to said axis of 1°≦α≦10° and each rib crest extending at a second angle of inclination β to said axis greater than said angle of said troughs and in a range of 2°≦β≦12°.
Claim 10
Dependent Claim
27 words
An anchoring shank as set forth in claim 7 wherein said first angle is from 2° to 5° and said second angle is from 4° to 8°.
Claim 11
Dependent Claim
53 words
An anchoring shank as set forth in claim 7 wherein said rib crests and said troughs each have a cross-sectional profile selected from one of a circular, elliptical and oval cross-sectional profile and wherein each rib crest has a rounded profile extending over a circular sector of a third angle γ of 2/3π≦γ≦π.
Claim 12
Dependent Claim
21 words
An anchoring shank as set forth in claim 7 wherein each trough and each rib crest has a curved cross-sectional profile.
Claim 13
Dependent Claim
55 words
An anchoring shank as set forth in claim 10 wherein the distance between two adjacent centers of curvature of a trough and an adjacent rib crest parallel to a respective side surface is at least equal to the sum of the radii of curvature of said trough and said rib crest multiplied by cos (90-γ/2).
Claim 14
Dependent Claim
41 words
An anchoring shank as set forth in claim 10 wherein each said trough has an increasing radius of curvature towards a distal end of said shank and each said rib crest has a decreasing radius of curvature towards said distal end.
Claim 15
Dependent Claim
14 words
An anchoring shank as set forth in claim 6 wherein said axis is straight.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1990-11-02 | 1991-05-04 | 1991-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-02 | 1995-05-04 | 1995-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-02 | 1999-05-04 | 1999-11-03 | $7700.00 | Window Closed / Lapsed |