US5702484A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Endoprosthesis
Assignee: Biomet Deutschland GmbH
•
Filing: 1996-01-11
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Granted: 1997-12-30
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Expires: 2016-01-11
Abstract
Abstract An endoprosthesis for a cement free anchorage in a bone having a longitudinal direction comprises a prosthetic shank to be secured in the bone in the longitudinal direction of the bone. The prosthetic shank has a proximal end and a distal end and includes three plate-like blades arranged in parallel and presenting a cross-sectional profile that has an open configuration. A first one of the blades constitutes a central web and a second and third ones of the blades constitute side walls which enclose, at least partially, the central web and extend, at least partially, in parallel, in a direction of the central web. The prosthetic shank further includes bridges connecting the side walls with the central web. A region adjacent the distal end of the prosthetic shank is in the shape of a scoop and the blades are joined at least at the distal end to form a common cutting edge. A collar including a pin for receiving a ball joint is attached to the proximal end of the prosthetic shank.
Inventors
- 👤 Volkmar Goymann
- 👤 Emmanuel Anapliotis
- 👤 Juergen Darga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:19
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/30721; A61F2/30724; A61F2/32; A61F2/36; A61F2/3662; A61F2/30767; A61F2/367; A61F2/3676; A61F2002/30001; A61F2002/30108; A61F2002/3011; A61F2002/30112; A61F2002/30138; A61F2002/30156; A61F2002/30159; A61F2002/30177; A61F2002/30182; A61F2002/30189; A61F2002/30316; A61F2002/30329; A61F2002/30331; A61F2002/30332; A61F2002/30535; A61F2002/30565; A61F2002/30571; A61F2002/30593; A61F2002/30602; A61F2/30771; A61F2002/30841; A61F2002/30845; A61F2002/30878; A61F2002/30884; A61F2002/30906; A61F2/3609; A61F2002/3625; A61F2002/3631; A61F2002/365; A61F2002/3678; A61F2002/368; A61F2220/00; A61F2220/0025; A61F2220/0033; A61F2230/00; A61F2230/0002; A61F2230/0004; A61F2230/0017; A61F2230/0023; A61F2230/0028; A61F2230/0036; A61F2230/0056; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00023; A61F2310/00179; A61F2310/00293; A61F2310/00389; A61F2310/00592; A61F2310/00796
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
173 words
An endoprosthesis for a cement free anchorage in a bone having a longitudinal direction, comprising: a prosthetic shank to be secured in the bone in the longitudinal direction of the bone and having a proximal end and a distal end, the prosthetic shank comprising three plate-like blades arranged in parallel and presenting a cross-sectional profile that has an open configuration, a first one of the blades constituting a central web and a second and third ones of the blades constituting side walls which enclose, at least partially, the central web and extend, at least partially, in parallel, in a direction of the central web, the prosthetic shank further including bridges connecting the side walls with the central web, wherein a region adjacent the distal end of the prosthetic shank is in the shape of a scoop and the blades are joined at least at the distal end to form a common cutting edge; and a collar including a pin for receiving a ball joint attached to the proximal end of the prosthetic shank.
Claim 2
Dependent Claim
173 words
An endoprosthesis for a cement free anchorage in a bone having a longitudinal direction, comprising: a prosthetic shank to be secured in the bone in the longitudinal direction of the bone and having a proximal end and a distal end, the prosthetic shank comprising three plate-like blades arranged in parallel and presenting a cross-sectional profile that has an open configuration, a first one of the blades constituting a central web and a second and third ones of the blades constituting side walls which enclose, at least partially, the central web and extend, at least partially, in parallel, in a direction of the central web, the prosthetic shank further including bridges connecting the side walls with the central web, wherein a region adjacent the distal end of the prosthetic shank is in the shape of a scoop and the blades are joined at least at the distal end to form a common cutting edge; and a collar including a pin for receiving a ball joint attached to the proximal end of the prosthetic shank.
Claim 3
Dependent Claim
47 words
The endoprosthesis according to claim 1, wherein the central web has a central plane that is parallel with the side walls and the pin is arranged on the collar to have a central axis that lies in an extension of the central plane of the central web.
Claim 4
Dependent Claim
24 words
The endoprosthesis according to claim 1, wherein the blades are tapered in a streamlined fashion toward the distal end and having a rounded configuration.
Claim 5
Dependent Claim
27 words
The endoprosthesis according to claim 3, wherein the blades each have a medial edge that is substantially S-shaped when viewed from a side of the prosthetic shank.
Claim 6
Dependent Claim
13 words
The endoprosthesis according to claim 1, wherein the cross-sectional profile is substantially m-shaped.
Claim 7
Dependent Claim
16 words
The endoprosthesis according to claim 5, wherein the central web projects medially beyond the side walls.
Claim 8
Dependent Claim
17 words
The endoprosthesis according to claim 1, wherein the bridges are web-like and have distally oriented cutting edges.
Claim 9
Dependent Claim
46 words
The endoprosthesis according to claim 1, wherein each side wall delimits a space between itself and the central web and the prosthetic shank has openings at the proximal end that communicate with a respective one of the spaces between the side walls and the central web.
Claim 10
Dependent Claim
19 words
The endoprosthesis according to claim 8, wherein one of the openings is associated with each one of the spaces.
Claim 11
Dependent Claim
29 words
The endoprosthesis according to claim 8, wherein the openings are in the form of elongated holes that extend from a medial to a lateral direction of the prosthetic shank.
Claim 12
Dependent Claim
20 words
The endoprosthesis according to claim 10, wherein the holes are parallel to one another and are surrounded by rounded-off edges.
Claim 13
Dependent Claim
29 words
The endoprosthesis according to claim 1, wherein each of the side walls has an opening and a recess in a region near the proximal end of the prosthetic shank.
Claim 14
Dependent Claim
38 words
The endoprosthesis according to claim 12, wherein the recess in each side wall has a form of a circular segment which opens laterally and the opening in each side wall has one of a triangular and circular shape.
Claim 15
Dependent Claim
27 words
The endoprosthesis according to claim 13, further including support members mounted in the openings and extending at right angles to the longitudinal direction of the prosthetic shank.
Claim 16
Dependent Claim
17 words
The endoprosthesis according to claim 14, wherein the support members comprise one of spongiosa and bioporous material.
Claim 17
Dependent Claim
24 words
The endoprosthesis according to claim 1, wherein the prosthetic shank has a proximal region that includes a lateral wall that is only partially closed.
Claim 18
Dependent Claim
24 words
The endoprosthesis according to claim 16, wherein the lateral wall has elongated slots that extend parallel to the longitudinal direction of the prosthetic shank.
Claim 19
Dependent Claim
19 words
The endoprosthesis according to claim 1, wherein the endoprosthesis comprises a titanium material and is a vacuum cast product.
Claim 20
Dependent Claim
16 words
The endoprosthesis according to claim 1, wherein the blades of the prosthetic shank have rough surfaces.
Claim 21
Dependent Claim
17 words
The endoprosthesis according to claim 19, wherein the rough surfaces are as a result of sand blasting.
Claim 22
Dependent Claim
21 words
The endoprosthesis according to claim 19, wherein the blades each include a coating of bioporous material which constitutes the rough surfaces.
Claim 23
Dependent Claim
28 words
The endoprosthesis according to claim 21, wherein the coating comprises one of a hydroxyapatite ceramic and a plasma spray with a layer thickness of 50 to 100 micrometers.
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US4978357A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-12-29 | 2001-06-30 | 2001-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-12-29 | 2005-06-30 | 2005-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-12-29 | 2009-06-30 | 2009-12-30 | $7700.00 | Window Closed / Lapsed |