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US5197990A
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Prosthetic intramedullary femoral prosthesis with preformed sheath
Assignee: HOWMEDICA INTERNATIONAL S DE RL
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Filing: 1991-05-16
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Granted: 1993-03-30
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Expires: 2011-05-16
Abstract
Abstract A prosthetic intramedullary femoral prosthesis (1) provided with a separate preformed sheath (9) made from an acrylic material which is dimensioned to enclose the prosthesis stem (4) from the distal tip (10) to a location on the stem (4) which will be adjacent the proximal cut end (6) of the femur (5) with which it will be used. <IMAGE>
Inventors
- 👤 Peter Lawes
- 👤 Jacques Vanderlinden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:51
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/32; A61F2/36; A61F2/3662; A61F2/30721; A61F2/30724; A61F2/30767; A61F2/30907; A61F2/3676; A61F2002/30001; A61F2002/30316; A61F2002/30535; A61F2002/30565; A61F2002/30571; A61F2002/30579; A61F2/30771; A61F2002/30878; A61F2002/30919; A61F2/46; A61F2002/4631; A61F2310/00; A61F2310/00005; A61F2310/00353; A61F2310/00389; A61F2310/00952
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
120 words
A prosthetic intramedullary femoral prosthesis comprising a stem and a separate preformed sheath made from an acrylic material which is dimensioned to enclose the prosthesis stem from the distal tip to a location on the stem which will be adjacent the proximal cut end of the femur with which it will be used, said preformed sheath having a shape substantially the same as the stem but extending further in the distal direction to produce a void between the distal tip thereof and the distal tip of the stem, said preformed sheath slidably receiving said stem to allow axial movement therebetween over the length of said stem after implantation, said sheath having a thickness of between 0.5 mm and 2 mm.
Claim 2
Dependent Claim
120 words
A prosthetic intramedullary femoral prosthesis comprising a stem and a separate preformed sheath made from an acrylic material which is dimensioned to enclose the prosthesis stem from the distal tip to a location on the stem which will be adjacent the proximal cut end of the femur with which it will be used, said preformed sheath having a shape substantially the same as the stem but extending further in the distal direction to produce a void between the distal tip thereof and the distal tip of the stem, said preformed sheath slidably receiving said stem to allow axial movement therebetween over the length of said stem after implantation, said sheath having a thickness of between 0.5 mm and 2 mm.
Claim 3
Dependent Claim
29 words
The prosthetic intramedullary femoral prosthesis as claimed in claim 1 in which the sheath is dimensioned and constructed to allow the stem to move further into it under load.
Claim 4
Dependent Claim
58 words
The prosthetic intramedullary femoral prosthesis as claimed in claim 1 in which the distal tip of the sheath is in the form of a cup, the inner end surface of which is spaced away from the distal tip of the prosthesis stem to provide a void when initially located in position, to accept subsequent inward movement after fitting.
Claim 5
Dependent Claim
25 words
The prosthetic intramedullary femoral prosthesis as claimed in claim 1 in which the sheath is made from a material similar to bone cement, i.e., polymethylmethacrylate.
Claim 6
Dependent Claim
21 words
The prosthetic intramedullary femoral prosthesis as claimed in claim 1 in which the sheath has a thickness of substantially 1 mm.
Claim 7
Dependent Claim
37 words
The prosthetic intramedullary femoral prosthesis as claimed in claim 1 in which said sheath is provided with means for centralizing the prosthesis stem in the intramedullary canal of the femur with which it is to be used.
Claim 8
Dependent Claim
20 words
The prosthetic intramedullary femoral prosthesis as in claim 6 in which the centralizing means include outwardly projecting resiliently deformable abutments.
Claim 9
Dependent Claim
29 words
The prosthetic intramedullary femoral prosthesis as claimed in claim 7 in which the resilient abutments are in the form of resilient wings, fins or arms which can deform inwardly.
Claim 10
Dependent Claim
19 words
The prosthetic intramedullary femoral prosthesis as claimed in claim 8 in which the abutments can deform substantially radially inwardly.
Claim 11
Dependent Claim
18 words
The prosthetic intramedullary femoral prosthesis as claimed in claim 8 in which the abutments can deform circumferentially inwardly.
Claim 12
Dependent Claim
105 words
A prosthetic intramedullary femoral prosthesis comprising a stem and a separate preformed sheath made from an acrylic material which is dimensioned to enclose the prosthesis stem from the distal tip to a location on the stem which will be adjacent the proximal cut end of the femur with which it will be used, said sheath being provided with means for centralizing the prosthesis stem in the intramedullary canal of the femur with which it is to be used, said centralizing means including outwardly projecting resiliently deformable abutments which resilient abutments are in the form of resilient wings, fins or arms which can deform circumferentially inwardly.
Claim 13
Dependent Claim
105 words
A prosthetic intramedullary femoral prosthesis comprising a stem and a separate preformed sheath made from an acrylic material which is dimensioned to enclose the prosthesis stem from the distal tip to a location on the stem which will be adjacent the proximal cut end of the femur with which it will be used, said sheath being provided with means for centralizing the prosthesis stem in the intramedullary canal of the femur with which it is to be used, said centralizing means including outwardly projecting resiliently deformable abutments which resilient abutments are in the form of resilient wings, fins or arms which can deform circumferentially inwardly.
References Cited (Backward Citations)
GB1409053A
Cited
GB1443470A
Cited
US4064567A
Cited
DE2808740A1
Cited
GB2052267A
Cited
WO1981000670A1
Cited
GB2104391A
Cited
US4919665A
Cited
US4619659A
Cited
US4753657A
Cited
US4670015A
Cited
GB2162753A
Cited
EP0179626A2
Cited
EP0187903A1
Cited
US4735625A
Cited
US4728335A
Cited
EP0278807A2
Cited
US4888023A
Cited
US4888023B1
Cited
DE3802214A1
Cited
DE9015067U1
Cited
US5080680A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-03-29 | 1996-09-28 | 1997-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-03-29 | 2000-09-28 | 2001-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-03-29 | 2004-09-28 | 2005-03-30 | $7700.00 | Window Closed / Lapsed |