Patent US4938770A successfully refreshed from Google Patents.
US4938770A
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Stem for a femoral head prosthesis
Assignee: Sulzer AG
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Filing: 1989-10-03
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Granted: 1990-07-03
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Expires: 2009-10-03
Abstract
Abstract The cavity of the stem of the tumor or re-operation prosthesis is subdivided by support elements into sub-cavities filled with bony material. The support elements are formed with central apertures through which the bony material can be supplied and re-vascularized from the living bone tissue of the femur stump. Wire mesh may cover over the apertures in the support elements as well as the slots between the circumferentially disposed webs which define the cavity of the stem.
Inventors
- 👤 Otto Frey
- 👤 Rudolf Koch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:47
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/32; A61F2/36; A61F2/3662; A61F2/3607; A61F2/28; A61F2002/2835; A61F2002/30001; A61F2002/30316; A61F2002/30535; A61F2002/30593; A61F2002/30594; A61F2/30767; A61F2/30907; A61F2002/30909
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
63 words
A stem for a femoral head prosthesis comprising a hollow region defining an internal cavity; a plurality of narrow webs in said hollow region disposed in circumferentially spaced relation to define slots, therebetween; and a plurality of discoid support elements disposed in longitudinally spaced relation within said internal cavity and in engagement with said webs, each said support element having an aperture therein.
Claim 2
Dependent Claim
63 words
A stem for a femoral head prosthesis comprising a hollow region defining an internal cavity; a plurality of narrow webs in said hollow region disposed in circumferentially spaced relation to define slots, therebetween; and a plurality of discoid support elements disposed in longitudinally spaced relation within said internal cavity and in engagement with said webs, each said support element having an aperture therein.
Claim 3
Dependent Claim
22 words
A stem as set forth in claim 1 wherein said web. extend to a distal end thereof and are readily expandable thereat.
Claim 4
Dependent Claim
33 words
A stem as set forth in claim 2 further comprising at least one axially movable clamping ring about said webs distally of said support elements for clamping said webs about a femur stump.
Claim 5
Dependent Claim
25 words
A stem as set forth in claim 3 wherein at least some of said webs have bores in a distal region for receiving bone screws.
Claim 6
Dependent Claim
33 words
A stem as set forth in claim 1 which further comprises a wire mesh covering said aperture of each respective support element, said mesh being of a size to permit bone growth therethrough.
Claim 7
Dependent Claim
27 words
A stem as set forth in claim 1 which further comprises a wire mesh covering each slot and being of a size to permit bone growth therethrough.
Claim 8
Dependent Claim
90 words
A stem for a femoral head prosthesis comprising a plurality of circumferentially disposed narrow webs defining an internal cavity to receive bone material therein, said webs being disposed in spaced relation to define a plurality of slots therebetween; a plurality of discoid support elements in supporting engagement with said webs to sub-divide said cavity, each support element having an aperture therein; and a wire mesh covering said aperture of at least a distal-most support element, said mesh being of a size to permit bone growth therethrough from a femur stump.
Claim 9
Dependent Claim
90 words
A stem for a femoral head prosthesis comprising a plurality of circumferentially disposed narrow webs defining an internal cavity to receive bone material therein, said webs being disposed in spaced relation to define a plurality of slots therebetween; a plurality of discoid support elements in supporting engagement with said webs to sub-divide said cavity, each support element having an aperture therein; and a wire mesh covering said aperture of at least a distal-most support element, said mesh being of a size to permit bone growth therethrough from a femur stump.
Claim 10
Dependent Claim
27 words
A stem as set forth in claim 7 which further comprises a wire mesh covering each slot and being of a size to permit bone growth therethrough.
Claim 11
Dependent Claim
46 words
A stem as set forth in claim 7 wherein said webs extend to a distal end thereof and are readily expandable thereat and at least one axially movable clamping ring about said webs distally of said support elements for clamping said webs about a femur stump.
Claim 12
Dependent Claim
25 words
A stem as set forth in claim 9 wherein at least some of said webs have bores in a distal region for receiving bone screws.
Claim 13
Dependent Claim
25 words
A stem as set forth in claim 4 wherein said webs are united at a distal end for fitting into a cavity of a femur.
Claim 14
Dependent Claim
27 words
A stem as set forth in claim 11 which further comprises a wire mesh covering each slot and being of a size to permit bone growth therethrough.
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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) | 1993-07-02 | 1994-01-01 | 1994-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-02 | 1998-01-01 | 1998-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-02 | 2002-01-01 | 2002-07-03 | $7700.00 | Window Closed / Lapsed |