US7879106B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hip joint prosthesis
Assignee: TJ Smith and Nephew Ltd
•
Filing: 2003-03-25
•
Granted: 2011-02-01
•
Expires: 2023-03-25
Abstract
Abstract A femoral implant for fitting to a resected femur comprises a section having a frustoconical external form, a stem part extending away from the section to a distal end of the implant, and a femoral head extending directly away from the section to the proximal end of the implant. The implant could have the femoral head integral with the section, or as a separate component secured thereto, with the stem being a separate one piece component incorporating the section.
Inventors
- 👤 Derek James Wallace McMinn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:34
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/38; A61F2/3859; A61F2/32; A61F2/36; A61F2/3601; A61F2/34; A61F2/3662; A61F2002/30001; A61F2002/30316; A61F2002/30329; A61F2002/30331; A61F2002/30332; A61F2002/30448; A61F2002/30449; A61F2002/30535; A61F2002/30593; A61F2/30767; A61F2/30771; A61F2002/30878; A61F2/3609; A61F2002/3611; A61F2002/365; A61F2002/3678; A61F2002/3686; A61F2/46; A61F2002/4631; A61F2220/00; A61F2220/0025; A61F2220/0033; A61F2220/005; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00029; A61F2310/00179
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
191 words
A femoral implant for a resected head of a femur, comprising: (a) a femoral head, at a proximal end of the implant; and (b) a stem part extending to a distal end of the implant; and (c) a section with a free end, the free end having a base portion positioned adjacent to the femoral head at the proximal end of the implant, the stem part extending from the section remote from the free end, said section comprising a frustoconically-shaped portion having an external surface of frustoconical or generally frustoconical form, wherein said section tapers towards said stem part and away from said femoral head along a straight axis, said femoral head extends directly away from said section to the proximal end of the implant, and said section further includes, at its maximum diameter, a base portion which extends substantially axially away from the frustoconically-shaped portion and is substantially the same diameter as the end surface of the resected head into which said stem is to be inserted, whereby the external surface at the periphery of the base potion is positioned against the end surface of the resected head in use.
Claim 2
Dependent Claim
191 words
A femoral implant for a resected head of a femur, comprising: (a) a femoral head, at a proximal end of the implant; and (b) a stem part extending to a distal end of the implant; and (c) a section with a free end, the free end having a base portion positioned adjacent to the femoral head at the proximal end of the implant, the stem part extending from the section remote from the free end, said section comprising a frustoconically-shaped portion having an external surface of frustoconical or generally frustoconical form, wherein said section tapers towards said stem part and away from said femoral head along a straight axis, said femoral head extends directly away from said section to the proximal end of the implant, and said section further includes, at its maximum diameter, a base portion which extends substantially axially away from the frustoconically-shaped portion and is substantially the same diameter as the end surface of the resected head into which said stem is to be inserted, whereby the external surface at the periphery of the base potion is positioned against the end surface of the resected head in use.
Claim 3
Dependent Claim
17 words
An implant as claimed in claim 1 , wherein the femoral head is separate from said section.
Claim 4
Dependent Claim
23 words
An implant as claimed in claim 2 , wherein the separate femoral head is secured to said section by respective interfitting parts thereof.
Claim 5
Dependent Claim
27 words
An implant as claimed in claim 3 , wherein a frustoconical spigot extending from said section is received in a complementarily shaped cavity in the femoral head.
Claim 6
Dependent Claim
19 words
An implant as claimed in claim 4 , wherein the spigot is a tight frictional fit in said cavity.
Claim 7
Dependent Claim
16 words
An implant as claimed in claim 4 , wherein the spigot is cemented in said cavity.
Claim 8
Dependent Claim
27 words
An implant as claimed in claim 3 , wherein a frustoconical spigot extending from said femoral head, is received in a complementarily shaped cavity in said section.
Claim 9
Dependent Claim
18 words
An implant as claimed in claim 1 , wherein a central part of the femoral head is hollow.
Claim 10
Dependent Claim
17 words
An implant as claimed in claim 1 , wherein the femoral head is integral with said section.
Claim 11
Dependent Claim
14 words
An implant as claimed in claim 1 , which is manufactured of cobalt chrome.
Claim 12
Dependent Claim
14 words
An implant as claimed in claim 1 , in which the stem is curved.
Claim 13
Dependent Claim
14 words
An implant as claimed in claim 1 , wherein the stem part is straight.
Claim 14
Dependent Claim
29 words
An implant as claimed in claim 1 , wherein a free periphery of the femoral head extends over and is directly adjacent to a proximal end of said section.
Claim 15
Dependent Claim
153 words
A stem for connecting to a femoral head of a femoral implant for a resected head of a femur, comprising: a stem part extending to a distal end of the stem, and a section, comprising a frustoconically-shaped portion along a straight axis and having an external surface of frustoconical or generally frustoconical form, wherein said section has a free end adjacent the femoral head at the proximal end of the implant and tapers towards said stem part, said section terminates at the free end of the section, and said section further includes, at its maximum diameter, a base portion which extends substantially axially away from the frustoconically-shaped portion and is substantially the same diameter as the end surface of the resected head into which said stem is to be inserted, whereby the external surface at the periphery of the base potion is positioned against the end surface of the resected head in use.
Claim 16
Dependent Claim
153 words
A stem for connecting to a femoral head of a femoral implant for a resected head of a femur, comprising: a stem part extending to a distal end of the stem, and a section, comprising a frustoconically-shaped portion along a straight axis and having an external surface of frustoconical or generally frustoconical form, wherein said section has a free end adjacent the femoral head at the proximal end of the implant and tapers towards said stem part, said section terminates at the free end of the section, and said section further includes, at its maximum diameter, a base portion which extends substantially axially away from the frustoconically-shaped portion and is substantially the same diameter as the end surface of the resected head into which said stem is to be inserted, whereby the external surface at the periphery of the base potion is positioned against the end surface of the resected head in use.
Claim 17
Dependent Claim
30 words
A stem as claimed in claim 14 , wherein a spigot extends from the free end of the section for connection, in use, of a femoral head to said stem.
Claim 18
Dependent Claim
16 words
A stem as claimed in claim 15 , wherein the spigot has a frustoconical external surface.
Claim 19
Dependent Claim
31 words
A stem as claimed in claim 14 , wherein a recess is provided in the free end of the section for connection, in use, of a femoral head to the stem.
Claim 20
Dependent Claim
21 words
A stem as claimed in claim 14 , modified for biological fixation, in use, in the medullary canal of a patient.
Claim 21
Dependent Claim
14 words
A stem as claimed in claim 14 , wherein the stem part is curved.
Claim 22
Dependent Claim
197 words
A femoral implant for a resected head of a femur, comprising: (a) a femoral head, at a proximal end of the implant; and (b) a stem part extending to a distal end of the implant; and (c) a section with a free end, the free end having a base portion positioned adjacent to the femoral head at the proximal end of the implant, the stem part extending from the section remote from the free end, said section comprising a frustoconically-shaped portion along a straight axis and having an external surface of frustoconical or generally frustoconical form, wherein said section tapers towards said stem part and away from said femoral head, said femoral head being immediately adjacent to and extending directly away from said section to the proximal end of the implant, and said section further includes, at its maximum diameter, a base portion which extends substantially axially away from the frustoconically-shaped portion and is substantially the same diameter as the end surface of the resected head into which said stem is to be inserted, whereby the external surface at the periphery of the base potion is positioned against the end surface of the resected head in use.
Claim 23
Dependent Claim
197 words
A femoral implant for a resected head of a femur, comprising: (a) a femoral head, at a proximal end of the implant; and (b) a stem part extending to a distal end of the implant; and (c) a section with a free end, the free end having a base portion positioned adjacent to the femoral head at the proximal end of the implant, the stem part extending from the section remote from the free end, said section comprising a frustoconically-shaped portion along a straight axis and having an external surface of frustoconical or generally frustoconical form, wherein said section tapers towards said stem part and away from said femoral head, said femoral head being immediately adjacent to and extending directly away from said section to the proximal end of the implant, and said section further includes, at its maximum diameter, a base portion which extends substantially axially away from the frustoconically-shaped portion and is substantially the same diameter as the end surface of the resected head into which said stem is to be inserted, whereby the external surface at the periphery of the base potion is positioned against the end surface of the resected head in use.
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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) | 2014-01-31 | 2014-08-02 | 2015-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2018-01-31 | 2018-08-02 | 2019-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2022-01-31 | 2022-08-02 | 2023-02-01 | $7700.00 | Window Closed / Lapsed |