US5152798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Endoprosthesis
Assignee: Johnson and Johnson
•
Filing: 1989-12-21
•
Granted: 1992-10-06
•
Expires: 2009-12-21
Abstract
Abstract Endoprosthesis, in particular a hip joint prosthesis, provided with a hollow shaft being implantable in a hollow space of a bone, being of a tubular and curved shape and diminishing with respect to its diameter and material cross-cut, whereby, from the end that is near to the joint towards the end that is far away from the joint, the bending rigidity of the shaft diminishes to a relatively larger extent than the longitudinal rigidity of the shaft.
Inventors
- 👤 Curt Kranz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:34
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/32; A61F2/36; A61F2/3662; A61F2/30767; A61F2/367; A61F2/3676; A61F2002/30001; A61F2002/30003; A61F2002/30004; A61F2002/30014; A61F2002/30316; A61F2002/30317; A61F2002/30324; A61F2002/30329; A61F2002/30451; A61F2002/30476; A61F2002/30495; A61F2002/30535; A61F2002/30561; A61F2002/30593; A61F2002/30594; A61F2002/30667; A61F2002/30708; A61F2/30721; A61F2002/30733; A61F2/30771; A61F2002/30772; A61F2002/30784; A61F2002/30785; A61F2002/30795; A61F2/3094; A61F2/30942; A61F2002/30952; A61F2002/30971; A61F2002/30973; A61F2002/30975; A61F2/3609; A61F2002/365; A61F2002/3652; A61F2002/3678; A61F2002/368; A61F2220/00; A61F2220/0025; A61F2220/0058; A61F2250/00; A61F2250/0014; A61F2250/0018; A61F2250/0029; A61F2250/0036; A61F2250/0058; A61F2250/0071; A61F2250/0084; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00023; A61F2310/00389; A61F2310/00592; A61F2310/00796
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
158 words
An endoprosthesis comprising: a hollow shaft being implantable in a hollow space of a bone, said hollow shaft having a joint end and an end distant from said joint end, and being of a tubular and curved shape having an inner curved side and an outer curved side, and said hollow shaft diminishing substantially continuously with respect to its diameter and its cross-sectional area, from the joint end towards the distant end, and the bending rigidity of said shaft and the longitudinal rigidity of said shaft diminishing substantially continuously from said joint end to said end distant from said joint end, wherein the inner curved side of said shaft has an elongated notch extending from said distant end a substantial distance toward and terminating before reaching said joint end to diminish bending rigidity in a corresponding region of said shaft so that the bending rigidity diminishes to a relatively larger extent than the longitudinal rigidity of said shaft.
Claim 2
Dependent Claim
158 words
An endoprosthesis comprising: a hollow shaft being implantable in a hollow space of a bone, said hollow shaft having a joint end and an end distant from said joint end, and being of a tubular and curved shape having an inner curved side and an outer curved side, and said hollow shaft diminishing substantially continuously with respect to its diameter and its cross-sectional area, from the joint end towards the distant end, and the bending rigidity of said shaft and the longitudinal rigidity of said shaft diminishing substantially continuously from said joint end to said end distant from said joint end, wherein the inner curved side of said shaft has an elongated notch extending from said distant end a substantial distance toward and terminating before reaching said joint end to diminish bending rigidity in a corresponding region of said shaft so that the bending rigidity diminishes to a relatively larger extent than the longitudinal rigidity of said shaft.
Claim 3
Dependent Claim
25 words
An endoprosthesis as defined in claim 1, wherein a remaining portion of said shaft in the area of said elongated notch is substantially partially tubular.
Claim 4
Dependent Claim
57 words
An endoprosthesis as defined in claim 2, wherein said shaft comprises two partially tubular portions, one said partially tubular portion comprises said inner curved side and the other one of said two partially tubular portions comprises said outer curved side, said outer side extending further from said joint end and being longer than said inner curved side.
Claim 5
Dependent Claim
14 words
An endoprosthesis as defined in claim 1, wherein said shaft comprises a titanium-aluminum-vanadium alloy.
Claim 6
Dependent Claim
13 words
An endoprosthesis as defined in claim 4, wherein said titanium-aluminum-vanadium alloy comprises TiA16V4.
Claim 7
Dependent Claim
20 words
An endoprosthesis as defined in claim 1, further comprising means for defining openings in a wall of said hollow shaft.
Claim 8
Dependent Claim
31 words
An endoprosthesis as defined in claim 6, wherein said hollow shaft is filled with polyethylene and a surface of the polyethylene is coated wit apatite in a region of said openings.
Claim 9
Dependent Claim
41 words
An endoprosthesis as defined in claim 6, further comprising one of a joint and a joint part onto which a joint can be attached detachably connected to the joint end by means of a bracing ring with a predetermined breaking point.
Claim 10
Dependent Claim
15 words
An endoprosthesis as defined in claim 8, wherein said joint part comprises an attachment cone.
Claim 11
Dependent Claim
30 words
An endoprosthesis as defined in claim 1, further comprising means for defining recesses in one of said inner and outer curved sides of said hollow shaft for weakening the wall.
Claim 12
Dependent Claim
21 words
An endoprosthesis as defined in claim 10, wherein said recesses are filled with said material which permits ingrowth of line tissue.
Claim 13
Dependent Claim
38 words
An endoprosthesis as defined in claim 11, wherein said recesses are partly filled with said material, and the surface of the recesses partly filled with said material are indented with relation to the rest of the shaft surface.
Claim 14
Dependent Claim
28 words
An endoprosthesis as defined in claim 1, wherein at least part of a surface of said endoprosthesis is coated with a material which permits ingrowth of live tissue.
Claim 15
Dependent Claim
13 words
An endoprosthesis as defined in claim 1, wherein said hollow shaft is collarless.
References Cited (Backward Citations)
US3314420A
Cited
US4287617A
Cited
US4595393A
Cited
US4904264A
Cited
US4718914A
Cited
US4792339A
Cited
EP0243585A2
Cited
US4904262A
Cited
US4919678A
Cited
US4865608A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-10-06 | 1996-04-06 | 1996-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-06 | 2000-04-06 | 2000-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-06 | 2004-04-06 | 2004-10-06 | $7700.00 | Window Closed / Lapsed |