Patent EP0468600A1 successfully refreshed from Google Patents.
EP0468600A1
Expired / Lapsed
EP
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Components of a modular femoral fixation system
Assignee: Howmedica Osteonics Corp
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Filing: 1987-06-18
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Granted: —
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Expires: 2007-06-18
Abstract
Abstract <sub>5</sub>n7 A bone implant (1) for use in the stabilization of a bone fracture characterized in that said bone implant comprisesan integral substantially cylindrical expansion sleeve (3) having a smoothly rounded circumferentially-closed dome (7) at one end, a circumferentially-closed circular ring (9) at its other end, and a plurality of thin elongated strips (11) extending between, and connected at their opposed ends by, said circumferentially-closed dome (7) and ring (9), with said plurality of strips (11) defining together a cylindrical sleeve wall, said strips (11) being of varying radial thickness along their length and having textured outer surfaces, and said cylindrical sleeve wall having in the rest position of the sleeve an outer diameter equal to the outer diameter of the circular ring (9), an inner diameter adjacent said ring (9) equal to the inner diameter of said ring (9) and an inner diameter in a region (r<sub>2</sub>) spaced from said ring (9) reduced from the inner diameter of said ring (9); andan elongated plunger (5) having at one end thereof a substantially cylindrical body portion (17) having a diameter essentially equal to the inner diameter of said circumferentially-closed circular ring (9) of the expansion sleeve (3),whereby when said expansion sleeve (3) is held in a cavity in a bone fragment on one side of a fracture and the plunger (5) is then advanced through said circular ring (9) and into the interior of said sleeve (3) with its substantially cylindrical body portion (17) in the leading position, said plurality of strips (11) having textured outer surfaces are caused to expand radially outwardly and thereby securely grip said bone fragment.
Inventors
- 👤 Michael William Chapman
- 👤 Dana Christopher Mears
- 👤 Charles Cannon Edwards
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 13:27
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/72; A61B17/7233; A61B17/725; A61B17/74; A61B17/742; A61B17/744; A61B17/746; A61B17/80; A61B17/8061; A61B17/7258; A61B17/7266; A61B17/7283; Y; Y10; Y10S; Y10S606/00; Y10S606/902; Y10S606/907
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
274 words
A bone implant (1) for use in the stabilization of a bone fracture characterized in that said bone implant comprises an integral substantially cylindrical expansion sleeve (3) having a smoothly rounded circumferentially-closed dome (7) at one end, a circumferentially-closed circular ring (9) at its other end, and a plurality of thin elongated strips (11) extending between, and connected at their opposed ends by, said circumferentially-closed dome (7) and ring (9), with said plurality of strips (11) defining together a cylindrical sleeve wall, said strips (11) being of varying radial thickness along their length and having textured outer surfaces, and said cylindrical sleeve wall having in the rest position of the sleeve an outer diameter equal to the outer diameter of the circular ring (9), an inner diameter adjacent said ring (9) equal to the inner diameter of said ring (9) and an inner diameter in a region (r 2 ) spaced from said ring (9) reduced from the inner diameter of said ring (9); and an elongated plunger (5) having at one end thereof a substantially cylindrical body portion (17) having a diameter essentially equal to the inner diameter of said circumferentially-closed circular ring (9) of the expansion sleeve (3), whereby when said expansion sleeve (3) is held in a cavity in a bone fragment on one side of a fracture and the plunger (5) is then advanced through said circular ring (9) and into the interior of said sleeve (3) with its substantially cylindrical body portion (17) in the leading position, said plurality of strips (11) having textured outer surfaces are caused to expand radially outwardly and thereby securely grip said bone fragment.
Claim 2
Dependent Claim
274 words
A bone implant (1) for use in the stabilization of a bone fracture characterized in that said bone implant comprises an integral substantially cylindrical expansion sleeve (3) having a smoothly rounded circumferentially-closed dome (7) at one end, a circumferentially-closed circular ring (9) at its other end, and a plurality of thin elongated strips (11) extending between, and connected at their opposed ends by, said circumferentially-closed dome (7) and ring (9), with said plurality of strips (11) defining together a cylindrical sleeve wall, said strips (11) being of varying radial thickness along their length and having textured outer surfaces, and said cylindrical sleeve wall having in the rest position of the sleeve an outer diameter equal to the outer diameter of the circular ring (9), an inner diameter adjacent said ring (9) equal to the inner diameter of said ring (9) and an inner diameter in a region (r 2 ) spaced from said ring (9) reduced from the inner diameter of said ring (9); and an elongated plunger (5) having at one end thereof a substantially cylindrical body portion (17) having a diameter essentially equal to the inner diameter of said circumferentially-closed circular ring (9) of the expansion sleeve (3), whereby when said expansion sleeve (3) is held in a cavity in a bone fragment on one side of a fracture and the plunger (5) is then advanced through said circular ring (9) and into the interior of said sleeve (3) with its substantially cylindrical body portion (17) in the leading position, said plurality of strips (11) having textured outer surfaces are caused to expand radially outwardly and thereby securely grip said bone fragment.
Claim 3
Dependent Claim
80 words
A bone implant of claim 1 further characterized in that said dome (7) is provided with means (15) for releasably securing an elongated rod thereto so that said rod extends within said expansion sleeve (3) and through said ring (9) along the longitudinal axis of said sleeve (3) and can thereby be used to insert and hold said expansion sleeve (3) in said cavity, and said plunger (5) is cannulated along its longitudinal axis to receive said elongated insertion rod.
Claim 4
Dependent Claim
37 words
A bone implant of claim 1 further characterized in that said plurality of strips (11) are resilient and expand radially outwardly in elastic deformation when said plunger (5) is advanced into the interior of said sleeve (3).
Claim 5
Dependent Claim
21 words
A bone implant of claim 3 further characterized in that said expansion sleeve (3) is made of a resilient titanium-base alloy.
Claim 6
Dependent Claim
36 words
A bone implant of claim 2 further characterized in that said means for releasably securing an elongated insertion rod to said dome (7) comprises a centrally-disposed threaded axial through bore (15) provided in said dome (7).
Claim 7
Dependent Claim
57 words
A bone implant of claim 1 further characterized in that said elongated plunger (5) has a cylindrical stem portion (19) extending from said substantially cylindrical body portion (17) to the other end of the plunger (5), with the diameter of said cylindrical stem portion (19) being less than the diameter of said substantially cylindrical body portion (17).
Claim 8
Dependent Claim
66 words
A bone implant of claim 1 in combination with means for connecting said plunger (5) to another bone fragment on the other side of the fracture, said plunger (5) connecting means comprising a hollow sleeve (47) dimensioned to receive said plunger (5) in a sliding fit, said hollow sleeve (47) being an integral portion of an angled side plate (43) secured to said other bone fragment.
Claim 9
Dependent Claim
62 words
A bone implant of claim 1 further characterized in that a plurality of openings (13) are provided in said expansion sleeve (3), in the rest position of said sleeve (3), so that an extrudable material placed within said expansion sleeve (3) can be extruded through said openings (13) when the plunger (5) is advanced into the interior of the expansion sleeve (3).
Claim 10
Dependent Claim
38 words
A bone implant of claim 1 further characterized in that said bone implant further comprises means (10, 12, 18) to lock said expansion sleeve (3) and elongated plunger (5) against axial disengagement after implantation of said implant (1).
Claim 11
Dependent Claim
66 words
A bone implant of claim 9 further characterized in that said locking means comprises a raised annular lip (18) on said plunger body portion (17) and a groove (10) provided in the inner wall of said sleeve circular ring (9), with said lip (18) adapted to fit into said groove (10) in a snap fit when said plunger (5) is fully advanced within said sleeve (3).
References Cited (Backward Citations)
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