US4272855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anchoring surface for a bone implant
Assignee: Sulzer AG
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Filing: 1979-05-10
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Granted: 1981-06-16
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Expires: 1999-05-10
Abstract
Abstract The anchoring surface of the bone implant is provided with villi (depressions or projections) devoid of corners and edges. The villi are of generally conical shape with transition surfaces merging into the base level of the anchoring surface. The villi allow implanting in a bone without cement since bone tissue is allowed to grow into or around the villi.
Inventors
- 👤 Otto Frey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:36
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/30767; A61F2/30771; A61F2/32; A61F2/36; A61F2/3662; A61F2002/30001; A61F2002/30108; A61F2002/3011; A61F2002/30112; A61F2002/30125; A61F2002/30878; A61F2002/30891; A61F2002/30892; A61F2002/30894; A61F2230/00; A61F2230/0002; A61F2230/0004; A61F2230/0008
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
130 words
A bone implant having an anchoring surface including a plurality of villi, each said villus having a generally conical shape devoid of corners and edges and a longitudinal axis extending from a base level of said surface at an angle of from 50° to 90°, each said villus having a transition surface merging into said base level of said anchoring surface without corners and edges, each said villus having a cross-section in a transverse plane at said base level with a transverse width D and a longitudinal length L in the range D≦L≦3 D, a height H from said base level in the range 1D≦H≦5 D, and with a spacing A between the generatrices of the conical shape of adjacent villi in said transverse plane in the range 0.25 D≦A≦1D.
Claim 2
Dependent Claim
130 words
A bone implant having an anchoring surface including a plurality of villi, each said villus having a generally conical shape devoid of corners and edges and a longitudinal axis extending from a base level of said surface at an angle of from 50° to 90°, each said villus having a transition surface merging into said base level of said anchoring surface without corners and edges, each said villus having a cross-section in a transverse plane at said base level with a transverse width D and a longitudinal length L in the range D≦L≦3 D, a height H from said base level in the range 1D≦H≦5 D, and with a spacing A between the generatrices of the conical shape of adjacent villi in said transverse plane in the range 0.25 D≦A≦1D.
Claim 3
Dependent Claim
23 words
An implant as set forth in claim 1 wherein said longitudinal axis of a villus is directed perpendicularly to the local stress direction.
Claim 4
Dependent Claim
34 words
An implant as set forth in claim 1 wherein a villus having a longitudinal length L greater than a transverse width D thereof has said longitudinal axis directed perpendicularly to the local stress direction.
Claim 5
Dependent Claim
35 words
An implant as set forth in claim 1 wherein a villus having a longitudinal length L greater than a transverse width D thereof has a height H at least equal to said longitudinal length L.
Claim 6
Dependent Claim
25 words
An implant as set forth in claim 1 wherein a villus has a height H at least equal to twice said transverse width D thereof.
Claim 7
Dependent Claim
18 words
An implant as set forth in claim 1 wherein each villus is a depression in said anchoring surface.
Claim 8
Dependent Claim
14 words
An implant as set forth in claim 1 wherein each villus is a projection.
Claim 9
Dependent Claim
17 words
An implant as set forth in claim 1 wherein said width is between 0.25 and 10 millimeters.
Claim 10
Dependent Claim
132 words
A bone implant having an anchoring surface including a plurality of villi, each said villus having a generally conical shape devoid of corners and edges and a longitudinal axis extending from a base level of said surface at an angle of from 50° to 90°, each said villus having a transition surface merging into said base level of said anchoring surface without corners and edges, each said villus having a cross-section in a transverse plane at said base level with a transverse width D and a longitudinal length L in the range of D≦L≦3 D, a height H from said base level in the range D≦H≦5 D, and with a spacing A between the generatrices of the conical shape of adjacent villi in said transverse plane in the range 0.25 D≦A≦3 D.
Claim 11
Dependent Claim
132 words
A bone implant having an anchoring surface including a plurality of villi, each said villus having a generally conical shape devoid of corners and edges and a longitudinal axis extending from a base level of said surface at an angle of from 50° to 90°, each said villus having a transition surface merging into said base level of said anchoring surface without corners and edges, each said villus having a cross-section in a transverse plane at said base level with a transverse width D and a longitudinal length L in the range of D≦L≦3 D, a height H from said base level in the range D≦H≦5 D, and with a spacing A between the generatrices of the conical shape of adjacent villi in said transverse plane in the range 0.25 D≦A≦3 D.
Claim 12
Dependent Claim
135 words
A bone implant having an anchoring surface including a plurality of villi, each said villus having a generally conical shape devoid of corners and edges and a longitudinal axis extending from a base level of said surface at an angle of from 50° to 90°, each said villus having a transition surface merging into said base level of said anchoring surface without corners and edges, each said villus having a cross-section in a transverse plane at said base level with a transverse width D and a longitudinal length L in the range D≦L≦3 D, a height H from said base level in the range of 0.5 D≦H≦5 D, and with a spacing A between the generatrices of the conical shape of adjacent villi in said transverse plane at most equal to said transverse width D.
Claim 13
Dependent Claim
135 words
A bone implant having an anchoring surface including a plurality of villi, each said villus having a generally conical shape devoid of corners and edges and a longitudinal axis extending from a base level of said surface at an angle of from 50° to 90°, each said villus having a transition surface merging into said base level of said anchoring surface without corners and edges, each said villus having a cross-section in a transverse plane at said base level with a transverse width D and a longitudinal length L in the range D≦L≦3 D, a height H from said base level in the range of 0.5 D≦H≦5 D, and with a spacing A between the generatrices of the conical shape of adjacent villi in said transverse plane at most equal to said transverse width D.
Claim 14
Dependent Claim
127 words
A bone implant having an anchoring surface including a plurality of villi, each said villus having a generally conical shape devoid of corners and edges and a longitudinal axis extending from a base level of said surface at an angle of from 50° to 90°, each said villus having a transition surface merging into said base level of said anchoring surface without corners and edges, each said villus having a cross-section in a transverse plane at said base level with a transverse width D and a longitudinal length L in the range of D≦L≦3 D, a height H from said base level of 1.3 D, and with a spacing A between the generatrices of the conical shape of adjacent villi in said transverse plane of 0.75 D.
Claim 15
Dependent Claim
127 words
A bone implant having an anchoring surface including a plurality of villi, each said villus having a generally conical shape devoid of corners and edges and a longitudinal axis extending from a base level of said surface at an angle of from 50° to 90°, each said villus having a transition surface merging into said base level of said anchoring surface without corners and edges, each said villus having a cross-section in a transverse plane at said base level with a transverse width D and a longitudinal length L in the range of D≦L≦3 D, a height H from said base level of 1.3 D, and with a spacing A between the generatrices of the conical shape of adjacent villi in said transverse plane of 0.75 D.
Claim 16
Dependent Claim
133 words
A bone implant having an anchoring surface including a plurality of villi, each said villus having a generally conical shape devoid of corners and edges and a longitudinal axis extending from a base level of said surface at an angle of from 50° to 90°, each said villus having a transition surface merging into said base level of said anchoring surface without corners and edges, each said villus having a cross-section in a transverse plane at said base level with a transverse width D and a longitudinal length L in the range of D≦L≦3 D, a height H from said base level in the range 0.5 D≦H≦5 D, and with a spacing A between the generatrices of the conical shape of adjacent villi in said transverse plane in the range 0.25 D≦A≦3 D.
Claim 17
Dependent Claim
133 words
A bone implant having an anchoring surface including a plurality of villi, each said villus having a generally conical shape devoid of corners and edges and a longitudinal axis extending from a base level of said surface at an angle of from 50° to 90°, each said villus having a transition surface merging into said base level of said anchoring surface without corners and edges, each said villus having a cross-section in a transverse plane at said base level with a transverse width D and a longitudinal length L in the range of D≦L≦3 D, a height H from said base level in the range 0.5 D≦H≦5 D, and with a spacing A between the generatrices of the conical shape of adjacent villi in said transverse plane in the range 0.25 D≦A≦3 D.
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) | 1984-06-15 | 1984-12-15 | 1985-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-15 | 1988-12-15 | 1989-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-15 | 1992-12-15 | 1993-06-16 | $7700.00 | Window Closed / Lapsed |