US5554192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Intramedullary implant stem and centralizer
Assignee: Zimmer Technology Inc
•
Filing: 1994-10-05
•
Granted: 1996-09-10
•
Expires: 2014-10-05
Abstract
Abstract An implant stem 10 and distal centralizer 20. Implant stem 10 has a plurality of longitudinal channels 14 formed around its periphery adjacent its distal end 12. Channels 14 converge radially toward the apex of the stem distal end 12. Channels extend only partially into the body of implant stem 10 to provide sufficient material to maintain the structural integrity of the distal end of the implant. Centralizer 20 includes a plurality of radially extending blades 22. The proximal end of each blade 22 is shaped to extend upwardly for securely mating with implant stem 10. The complimentary cruciate configuration of channels 14 and blades 22 allows centralizer 20 to be securely attached to implant stem 10.
Inventors
- 👤 Roy D. Crowninshield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:10
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/30721; A61F2/30724; A61F2/32; A61F2/36; A61F2/3662; A61F2/3676; A61F2002/30001; A61F2002/30108; A61F2002/3011; A61F2002/30112; A61F2002/30138; A61F2002/30159; A61F2002/30179; A61F2002/30316; A61F2002/30329; A61F2002/30331; A61F2002/30362; A61F2002/30364; A61F2002/30367; A61F2002/30383; A61F2/30767; A61F2/30771; A61F2002/30878; A61F2002/30884; A61F2/46; A61F2002/4631; A61F2220/00; A61F2220/0025; A61F2220/0033; A61F2230/00; A61F2230/0002; A61F2230/0004; A61F2230/0017; A61F2230/0028; A61F2230/0058; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00023; A61F2310/00029
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
96 words
In combination, an implant prosthesis for insertion into a cavity prepared in a bone comprising a stem component having a distal end; and a centralizer for attachment to said stem component distal end, said stem component having a plurality of longitudinal channels formed around its periphery adjacent its said distal end, said centralizer including a plurality of blade parts for engaging said stem component within said channels when said centralizer is attached to said stem component, wherein said channels each have an inner wall, which converges radially toward the apex of said stem component distal end.
Claim 2
Dependent Claim
96 words
In combination, an implant prosthesis for insertion into a cavity prepared in a bone comprising a stem component having a distal end; and a centralizer for attachment to said stem component distal end, said stem component having a plurality of longitudinal channels formed around its periphery adjacent its said distal end, said centralizer including a plurality of blade parts for engaging said stem component within said channels when said centralizer is attached to said stem component, wherein said channels each have an inner wall, which converges radially toward the apex of said stem component distal end.
Claim 3
Dependent Claim
62 words
The combination of claim 1 wherein each said channel is defined by one of the inner walls and a pair of side walls, each of the inner walls being at an oblique angle to a longitudinal axis of the stem, and wherein said pair of side walls engage one of said blade parts when said centralizer is secured to said stem component.
Claim 4
Dependent Claim
22 words
The combination of claim 2 wherein the oblique angle is about 20° to 45° to the longitudinal axis of the stem component.
Claim 5
Dependent Claim
45 words
The combination of claim 1 wherein each blade part includes a proximal end shaped to extend towards said stem component distal end and having an edge for restrictive engagement with said stem component within a said channel when said centralizer is attached to said stem.
Claim 6
Dependent Claim
53 words
The combination of claim 1 wherein the plurality of blade parts comprises at least two centralizing blades for engaging said stem component within said channels, and wherein said centralizer includes at least one additional centralizing blade positioned about said centralizer to assist in centralizing said stem component within the cavity of the bone.
Claim 7
Dependent Claim
21 words
The combination of claim 5 wherein the at least one additional centralizing blade also engages said stem component within said channels.
Claim 8
Dependent Claim
157 words
In combination, an implant prosthesis for insertion into a cavity prepared in a bone comprising a stem component having a distal end; and a centralizer for attachment to said stem component distal end, said stem component having a plurality of longitudinal channels formed around its periphery adjacent its said distal end, said centralizer including a plurality of blade parts for engaging said stem component within said channels when said centralizer is attached to said stem component, wherein said channels converge radially toward the apex of said stem component distal end, and wherein each blade part includes a proximal end shaped to extend towards said stem component distal end and having an edge for restrictive engagement with said stem component within a said channel when said centralizer is attached to said stem, and wherein the proximal end of each blade part has an oblique inner edge for mating with a corresponding oblique inner wall of a corresponding channel.
Claim 9
Dependent Claim
157 words
In combination, an implant prosthesis for insertion into a cavity prepared in a bone comprising a stem component having a distal end; and a centralizer for attachment to said stem component distal end, said stem component having a plurality of longitudinal channels formed around its periphery adjacent its said distal end, said centralizer including a plurality of blade parts for engaging said stem component within said channels when said centralizer is attached to said stem component, wherein said channels converge radially toward the apex of said stem component distal end, and wherein each blade part includes a proximal end shaped to extend towards said stem component distal end and having an edge for restrictive engagement with said stem component within a said channel when said centralizer is attached to said stem, and wherein the proximal end of each blade part has an oblique inner edge for mating with a corresponding oblique inner wall of a corresponding channel.
Claim 10
Dependent Claim
130 words
In combination, an implant prosthesis for insertion into a cavity prepared in a bone comprising a stem component having a distal end; and a centralizer for attachment to said stem component distal end, said stem component having a plurality of longitudinal channels formed around its periphery adjacent its said distal end, said centralizer including a plurality of blade parts for engaging said stem component within said channels when said centralizer is attached to said stem component, wherein said channels converge radially toward the apex of said stem component distal end, and wherein said plurality of blade parts comprises a first pair of blades for engaging said stem component within said channels, and wherein said centralizer further includes a second pair of blades which do not engage any of said channels.
Claim 11
Dependent Claim
130 words
In combination, an implant prosthesis for insertion into a cavity prepared in a bone comprising a stem component having a distal end; and a centralizer for attachment to said stem component distal end, said stem component having a plurality of longitudinal channels formed around its periphery adjacent its said distal end, said centralizer including a plurality of blade parts for engaging said stem component within said channels when said centralizer is attached to said stem component, wherein said channels converge radially toward the apex of said stem component distal end, and wherein said plurality of blade parts comprises a first pair of blades for engaging said stem component within said channels, and wherein said centralizer further includes a second pair of blades which do not engage any of said channels.
Claim 12
Dependent Claim
46 words
The combination of claim 8 wherein said second pair of blades includes an arcuate inner edge which conforms substantially to an exterior contour of said distal end and which abut said exterior contour to provide additional support when said centralizer is attached to said stem component.
Claim 13
Dependent Claim
190 words
In combination, an implant prosthesis for insertion into a cavity prepared in a bone comprising a stem component having a distal end; and a centralizer for attachment to said stem component distal end, said stem component having a plurality of longitudinal channels formed around its periphery adjacent its said distal end, said centralizer including a plurality of blade parts for engaging said stem component within said channels when said centralizer is attached to said stem component, wherein said channels converge radially toward the apex of said stem component distal end, and wherein the plurality of blade parts comprises at least two centralizing blades for engaging said stem component within said channels, and wherein said centralizer includes at least one additional centralizing blade positioned about said centralizer to assist in centralizing said stem component within the cavity of the bone, and wherein the at least one additional centralizing blade does not engage any of said channels and includes an arcuate inner edge which conforms substantially to an exterior contour of said distal end and which abuts said exterior contour to provide additional support when said centralizer is attached to said component.
Claim 14
Dependent Claim
190 words
In combination, an implant prosthesis for insertion into a cavity prepared in a bone comprising a stem component having a distal end; and a centralizer for attachment to said stem component distal end, said stem component having a plurality of longitudinal channels formed around its periphery adjacent its said distal end, said centralizer including a plurality of blade parts for engaging said stem component within said channels when said centralizer is attached to said stem component, wherein said channels converge radially toward the apex of said stem component distal end, and wherein the plurality of blade parts comprises at least two centralizing blades for engaging said stem component within said channels, and wherein said centralizer includes at least one additional centralizing blade positioned about said centralizer to assist in centralizing said stem component within the cavity of the bone, and wherein the at least one additional centralizing blade does not engage any of said channels and includes an arcuate inner edge which conforms substantially to an exterior contour of said distal end and which abuts said exterior contour to provide additional support when said centralizer is attached to said component.
References Cited (Backward Citations)
US3793650A
Cited
US4268920A
Cited
EP0050533B1
Cited
GB2104391A
Cited
US4623353A
Cited
USD339865S
Cited
US5080680A
Cited
US5108439A
Cited
FR2683992A1
Cited
US5507831A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-09-10 | 2000-03-11 | 2000-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-09-10 | 2004-03-11 | 2004-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-09-10 | 2008-03-11 | 2008-09-10 | $7700.00 | Window Closed / Lapsed |