US5116380A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prosthetic implant with spacers having tapered trailing edges
Assignee: Zimmer Technology Inc
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Filing: 1991-02-28
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Granted: 1992-05-26
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Expires: 2011-02-28
Abstract
Abstract A prosthetic implant for insertion into a cement filled intramedullary canal including a plurality of spacers formed from PMMA. The spacers include a body having a frontal portion and a trailing portion. The body of the spacers narrowing with distance from said frontal portion toward said trailing portion. The narrowing body of the spacers interrupting the flow of cement along the implant body as the body is inserted into a cement filled intramedullary canal. The narrowing trailing portion of the spacers cause the cement flow to smoothly re-attach to the implant body without creating substantial disturbances or vortexes in the cement.
Inventors
- 👤 Leda C. Hewka
- 👤 Perry A. Geremakis
- 👤 Mark B. Lester
- 👤 Jack E. Parr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:46
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/30721; A61F2/30724; A61F2/30734; A61F2/30767; A61F2/32; A61F2/36; A61F2/3662; A61F2/367; A61F2/3676; A61F2002/30001; A61F2002/30108; A61F2002/3011; A61F2002/30138; A61F2002/30153; A61F2002/30199; A61F2002/30252; A61F2002/30273; A61F2002/30316; A61F2002/30317; A61F2002/30322; A61F2002/30329; A61F2002/30451; A61F2002/30535; A61F2002/30604; A61F2002/30616; A61F2/30771; A61F2002/30878; A61F2/3609; A61F2002/3625; A61F2002/3627; A61F2002/3631; A61F2002/3678; A61F2002/368; A61F2/46; A61F2/4603; A61F2002/4619; A61F2002/4631; A61F2220/00; A61F2220/0025; A61F2220/0058; A61F2230/00; A61F2230/0002; A61F2230/0017; A61F2230/0019; A61F2230/0063; A61F2230/0073; A61F2230/0086; A61F2250/00; A61F2250/0014; A61F2250/0026; A61F2310/00; A61F2310/00389; A61F2310/00952
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
125 words
A prosthetic implant for insertion into a cement filled intramedullary canal, said implant comprising a body for insertion into said canal, a means carried by said body for spacing said body a predetermined distance from an interior wall of said canal, said spacing means including a body extending a distance along said implant body, said body of said spacing means including a frontal portion and a trailing portion, said spacing means body narrowing with distance from said frontal portion toward said trailing portion, the narrowing body of said spacing means constitutes means for interrupting the flow of cement along said implant body as said body is inserted into a cement filled intramedullary canal and causing said cement flow to smoothly re-attach to said implant body.
Claim 2
Dependent Claim
125 words
A prosthetic implant for insertion into a cement filled intramedullary canal, said implant comprising a body for insertion into said canal, a means carried by said body for spacing said body a predetermined distance from an interior wall of said canal, said spacing means including a body extending a distance along said implant body, said body of said spacing means including a frontal portion and a trailing portion, said spacing means body narrowing with distance from said frontal portion toward said trailing portion, the narrowing body of said spacing means constitutes means for interrupting the flow of cement along said implant body as said body is inserted into a cement filled intramedullary canal and causing said cement flow to smoothly re-attach to said implant body.
Claim 3
Dependent Claim
15 words
The implant of claim 1 wherein said spacing means includes a plurality of spacing means.
Claim 4
Dependent Claim
43 words
The implant of claim 1 wherein said spacing means body includes a leading insertion end, said spacing means is positioned on said implant such that said frontal portion of said spacing means is closer to said leading insertion end than said trailing portion.
Claim 5
Dependent Claim
100 words
A prosthetic hip stem implant comprising a stem having a proximal end and a distal end, said stem including a pair of side walls spaced apart by a medial side wall and a lateral side wall, a spacer being carried by said medial side wall of said stem adjacent said proximal end, a spacer being carried by each of said pair of side walls and said medial side wall and said lateral side wall of stem adjacent said distal end, each of the spacers having a body, each of said spacer bodies narrowing with distance toward said implant proximal end.
Claim 6
Dependent Claim
100 words
A prosthetic hip stem implant comprising a stem having a proximal end and a distal end, said stem including a pair of side walls spaced apart by a medial side wall and a lateral side wall, a spacer being carried by said medial side wall of said stem adjacent said proximal end, a spacer being carried by each of said pair of side walls and said medial side wall and said lateral side wall of stem adjacent said distal end, each of the spacers having a body, each of said spacer bodies narrowing with distance toward said implant proximal end.
Claim 7
Dependent Claim
31 words
The implant of claim 4 wherein a spacer is also carried by each of said pair of side walls and said lateral side wall of said stem adjacent said proximal end.
Claim 8
Dependent Claim
47 words
The implant of claim 4 wherein each of said spacers includes an outer surface and an inner surface, said inner surface of said spacer being substantially flat for abutting contact with the wall of said implant, said cuter surface of each of said spacers being generally arcuate.
Claim 9
Dependent Claim
30 words
The implant of claim 4 wherein each of said spacers include a frontal portion and a trailing portion, said trailing portion being substantially smaller in cross-section than said frontal portion.
Claim 10
Dependent Claim
17 words
The implant of claim 4 further including a layer of PMMA between said implant and said spacer.
Claim 11
Dependent Claim
72 words
A spacer for connection to a prosthetic implant, said spacer comprising a body having a frontal portion and a trailing portion, said spacer narrowing with distance from said frontal portion toward said trailing portion, said spacer further including a mounting surface adapted for contact with said implant means, said spacer further including an extension projecting from said frontal portion opposite said trailing portion, said extension narrowing with distance from said frontal portion.
Claim 12
Dependent Claim
72 words
A spacer for connection to a prosthetic implant, said spacer comprising a body having a frontal portion and a trailing portion, said spacer narrowing with distance from said frontal portion toward said trailing portion, said spacer further including a mounting surface adapted for contact with said implant means, said spacer further including an extension projecting from said frontal portion opposite said trailing portion, said extension narrowing with distance from said frontal portion.
Claim 13
Dependent Claim
14 words
The spacer of claim 9 wherein the spacer has a substantially diamond shaped periphery.
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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) | 1995-05-26 | 1995-11-25 | 1996-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-26 | 1999-11-25 | 2000-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-26 | 2003-11-25 | 2004-05-26 | $7700.00 | Window Closed / Lapsed |