US3848273A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shank for bone implants
Assignee: Sulzer AG
•
Filing: 1973-01-29
•
Granted: 1974-11-19
•
Expires: 1993-01-29
Abstract
Abstract The shank is provided with texturized zones in the external surface to insure uniform contact between the bone cement and the shank when the shank is implanted. The texturized zones allow the shank to be withdrawn readily from a bone and can be formed to depths of 10 to 100 Mu .
Inventors
- 👤 O Frey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:27
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/30767; A61F2/30771; A61F2/3094; A61F2/32; A61F2/36; A61F2/3662; A61F2/38; A61F2/3804; A61F2/42; A61F2/4261; A61F2002/30001; A61F2002/30108; A61F2002/3011; A61F2002/30112; A61F2002/30136; A61F2002/30838; A61F2002/30904; A61F2002/30906; A61F2/3609; A61F2002/3625; A61F2002/3631; A61F2/46; A61F2002/4631; A61F2230/00; A61F2230/0002; A61F2230/0004
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
53 words
A solid shank for implanting in a bone cement to anchor a bone implant in a bone, said shank having a narrowing crosssectional area towards one end and an external non-porous surface having discrete unconnected depressions therein between raised portions of said shank, said depressions being between 10 microns and 100 microns depth.
Claim 2
Dependent Claim
53 words
A solid shank for implanting in a bone cement to anchor a bone implant in a bone, said shank having a narrowing crosssectional area towards one end and an external non-porous surface having discrete unconnected depressions therein between raised portions of said shank, said depressions being between 10 microns and 100 microns depth.
Claim 3
Dependent Claim
20 words
A shank as set forth in claim 1 wherein said depressions are separated by rounded portions to merge together smoothly.
Claim 4
Dependent Claim
25 words
A shank as set forth in claim 1 wherein said depressions extend into said surface for a depth of between 20 microns and 30 microns.
Claim 5
Dependent Claim
43 words
A shank as set forth in claim 1 having a longitudinal axis and wherein said surface includes at least two load bearing zones having said depressions therein, each zone having a regular toothing extending transversely of said longitudinal axis to form said depressions.
Claim 6
Dependent Claim
33 words
A shank as set forth in claim 4 wherein said regular toothing includes transverse rows of spaced apart teeth with the spacing between discrete teeth increasing toward said one end of said shank.
Claim 7
Dependent Claim
19 words
A shank as set forth in claim 1 wherein said zones includes a plurality of regularly disposed trough-shaped depressions.
Claim 8
Dependent Claim
32 words
A shank as set forth in claim 1 having a plurality of longitudinal side walls defining a generally trapezoidal cross-sectional area, at least two of said side walls having said depressions therein.
Claim 9
Dependent Claim
31 words
A shank as set forth in claim 10 wherein said depressions are each formed as a single shell of a length (u) to width (v) to depth (t) ratio of 12:4:1.
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) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |