US4745914A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Medullary cavity barrier
Assignee: Protek AG
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Filing: 1986-09-03
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Granted: 1988-05-24
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Expires: 2006-09-03
Abstract
Abstract The medullary cavity barrier is made of a metal in a rosette manner with leaves which are permanently and elastically deformable. The barrier is porous to the extent of being permeable to blood, fat and gases but impermeable to the passage of bone cement. During implantation, each outwardly extending leaf bends relative to a central core to fix the barrier within a tubular bone.
Inventors
- 👤 Otto Frey
- 👤 Rudolf Koch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:19
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/30721; A61F2/30723; A61F2002/30001; A61F2002/30108; A61F2002/3011; A61F2002/30159; A61F2002/30171; A61F2/30767; A61F2/30907; A61F2002/30909; A61F2/46; A61F2002/4631; A61F2230/00; A61F2230/0002; A61F2230/0028; A61F2230/005; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00023
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
50 words
A medullary cavity barrier for insertion in a tubular bone, said barrier comprising a one piece metal body having a rosette shape with at least three radially extending leaves, each said leaf being elastically and permanently deformable, said body being permeable to blood and fat and impermeable to bone cement.
Claim 2
Dependent Claim
50 words
A medullary cavity barrier for insertion in a tubular bone, said barrier comprising a one piece metal body having a rosette shape with at least three radially extending leaves, each said leaf being elastically and permanently deformable, said body being permeable to blood and fat and impermeable to bone cement.
Claim 3
Dependent Claim
20 words
A medullary cavity barrier as set forth in claim 1 wherein said body is made of a metal wire mesh.
Claim 4
Dependent Claim
17 words
A medullary cavity barrier as set forth in claim 2 wherein said body is of multi-layer construction.
Claim 5
Dependent Claim
50 words
A medullary cavity barrier as set forth in claim 1 wherein said body includes a central core and each leaf extends from said core in a common plane to a first bend and extends from said first bend at an angle to said plane whereby said leaves define a calyx.
Claim 6
Dependent Claim
26 words
A medullary cavity barrier as set forth in claim 4 wherein each leaf extends from said first bend to a second bend to extend radially inwardly.
Claim 7
Dependent Claim
21 words
A medullary cavity barrier as set forth in claim 1 wherein each leaf is of increasing width from said core outwardly.
Claim 8
Dependent Claim
56 words
A medullary cavity barrier for insertion in a tubular bone, said barrier comprising a porous one piece metal body having a rosette shape with at least three radially extending leaves, each said leaf being elastically and permanently deformable and said body having a porosity which is permeable to blood and fat and impermeable to bone cement.
Claim 9
Dependent Claim
56 words
A medullary cavity barrier for insertion in a tubular bone, said barrier comprising a porous one piece metal body having a rosette shape with at least three radially extending leaves, each said leaf being elastically and permanently deformable and said body having a porosity which is permeable to blood and fat and impermeable to bone cement.
Claim 10
Dependent Claim
20 words
A medullary cavity barrier as set forth in claim 7 wherein said body is made of a metal wire mesh.
Claim 11
Dependent Claim
49 words
A medullary cavity barrier as set forth in claim 7 wherein said body includes a central core and each leaf extends from said core in a common plane to a first bend and extends at an angle from said first bend to a second bend to extend radially inwardly.
Claim 12
Dependent Claim
21 words
A medullary cavity barrier as set forth in claim 9 wherein each leaf is of increasing width from said core outwardly.
References Cited (Backward Citations)
GB2052267A
Cited
EP0058744A1
Cited
US4447915A
Cited
WO1983000011A1
Cited
US4425908A
Cited
US4494531A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-05-24 | 1991-11-23 | 1992-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-24 | 1995-11-23 | 1996-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-24 | 1999-11-23 | 2000-05-24 | $7700.00 | Window Closed / Lapsed |