US5702479A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shaft component for a joint endoprosthesis
Assignee: Individual
•
Filing: 1994-02-18
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Granted: 1997-12-30
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Expires: 2014-02-18
Abstract
Abstract The shank unit of a joint endoprosthesis to be implanted in a tubular bone has a hollow, cylindrical, rotationally symmetrical anchoring sub-assembly (2) with a longitudinal axis (1) and an articulating sub-assembly (3). The articulating subassembly (3) is separate and detachably fixed to the anchoring sub-assembly (2). The articulating sub-assembly (3) comprises a rotationally symmetrical base element (31), an axis of rotation (32) and a neck extension (33) mounted eccentrically relative to the base element (31) and subtending an angle α of 70° to the axis of rotation (32) to receive a joint ball (36). The base element of the articulating sub-assembly (3) can be mounted on the anchoring sub-assembly (2) in such a way that its axis of rotation (32) coincides with the longitudinal axis (1) and be detachably fixed to sub-assembly (2) at any angular position relative to the longitudinal axis (1), as a result of which the radial direction of the neck extension (33) is selectively variable to adjust the anterior torsion relative to the anchoring sub-assembly (2).
Inventors
- 👤 Peter Schawalder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:44
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/32; A61F2/36; A61F2/3609; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/84; A61B17/86; A61B17/8695; A61F2/30767; A61F2/30771; A61F2/3607; A61F2/3662; A61F2/367; A61F2/3672; A61F2/3676; A61F2/38; A61F2002/30001; A61F2002/30108; A61F2002/30199; A61F2002/30224; A61F2002/30233; A61F2002/30235; A61F2002/30316; A61F2002/30329; A61F2002/30426; A61F2002/30433; A61F2002/30476; A61F2002/30494; A61F2002/305; A61F2002/30535; A61F2002/30537; A61F2002/30538; A61F2002/3054; A61F2002/30593; A61F2002/30772; A61F2002/30784; A61F2002/30785; A61F2002/30787; A61F2002/30789; A61F2002/3085; A61F2002/3625; A61F2002/3631; A61F2002/3678; A61F2002/368; A61F2002/369; A61F2002/3694; A61F2220/00; A61F2220/0025; A61F2220/0041; A61F2230/00; A61F2230/0063; A61F2230/0069
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
183 words
A shank unit for an endo joint prosthesis to be implanted in a tubular bone and comprising a hollow, cylindrical anchoring sub-assembly (2) having a longitudinal axis (1) and being substantially rotationally symmetrical, said anchoring sub-assembly comprising a plurality of coaxial, hollow cylindrical segments enlarging toward an upper end of said sub-assembly, said segments having perforated outer surfaces; an articulating sub-assembly (3) detachably connectable to said upper end of said anchoring sub-assembly (2), said articulating sub-assembly including a substantially rotationally symmetrical base element (31), an axis of rotation (32), and a neck extension (33) mounted eccentrically on said base element and subtending an angle of less than 90° with said axis of rotation (32) for receiving a joint ball (36); said base element of said articulating sub-assembly being detachably mountable on said on said anchoring sub-assembly (2) with the axes of said anchoring and articulated sub-assemblies coincident and with said articulated subassembly in any selected rotational angular position relative to said anchoring subassembly such that a radial position of said neck extension can be selected to adjust anterior torsion to a desired level.
Claim 2
Dependent Claim
183 words
A shank unit for an endo joint prosthesis to be implanted in a tubular bone and comprising a hollow, cylindrical anchoring sub-assembly (2) having a longitudinal axis (1) and being substantially rotationally symmetrical, said anchoring sub-assembly comprising a plurality of coaxial, hollow cylindrical segments enlarging toward an upper end of said sub-assembly, said segments having perforated outer surfaces; an articulating sub-assembly (3) detachably connectable to said upper end of said anchoring sub-assembly (2), said articulating sub-assembly including a substantially rotationally symmetrical base element (31), an axis of rotation (32), and a neck extension (33) mounted eccentrically on said base element and subtending an angle of less than 90° with said axis of rotation (32) for receiving a joint ball (36); said base element of said articulating sub-assembly being detachably mountable on said on said anchoring sub-assembly (2) with the axes of said anchoring and articulated sub-assemblies coincident and with said articulated subassembly in any selected rotational angular position relative to said anchoring subassembly such that a radial position of said neck extension can be selected to adjust anterior torsion to a desired level.
Claim 3
Dependent Claim
22 words
A shank unit according to claim 1 and including a screw (4) for detachably mounting said articulating sub-assembly to said articulating sub-assembly.
Claim 4
Dependent Claim
22 words
A shank unit according to claim 2 wherein said anchoring sub-assembly includes exterior threads whereby said sub-assembly is self-tapping into the bone.
Claim 5
Dependent Claim
28 words
A shank unit according to claim 2 wherein said anchoring sub-assembly includes a central, axial borehole having an inner thread of substantially constant diameter for receiving said screw.
Claim 6
Dependent Claim
27 words
A shank unit according to claim 2 wherein said base element (31) comprises a central borehole having an enlarged portion to receive a head of said screw.
Claim 7
Dependent Claim
46 words
A shank unit according to claim 1 wherein said upper end of said anchoring sub-assembly comprises an upper serrated surface lying in a plane substantially perpendicular to said longitudinal axis, and wherein said base element comprises a lower serrated surface to engage said upper serrated surface.
Claim 8
Dependent Claim
23 words
A shank unit according to claim 6 wherein serrations of said upper and lower surfaces have the same angular spacings as each other.
Claim 9
Dependent Claim
77 words
A shank unit according to claim 1 and further comprising a second base element between said first-mentioned base element of said articulating sub-assembly and said upper end of said anchoring sub-assembly, said second base element being substantially rotationally symmetrical about an axis of rotation and having upper and lower structured surfaces, said upper end of said anchoring sub-assembly and a lower surface of said first base element comprising surfaces structured to mate with said second base element.
Claim 10
Dependent Claim
30 words
A shank unit according to claim 8 and further comprising a cylindrical case segment (53) eccentrically mounted on said second base element, and wherein said mating structured surfaces are serrated.
Claim 11
Dependent Claim
24 words
A shank unit according to claim 1 wherein said neck extension subtends an angle of between 60° and 80° with said axis of rotation.
Claim 12
Dependent Claim
24 words
A shank unit according to claim 10 wherein said neck extension subtends an angle of between 65° and 75° with said axis of rotation.
Claim 13
Dependent Claim
29 words
A shank unit according to claim 1 wherein a lower end of said anchoring sub-assembly comprises a borehole having an internal thread for receiving an additional prosthesis or fastener.
References Cited (Backward Citations)
US4051559A
Cited
EP0038897A1
Cited
US4384373A
Cited
EP0228511A2
Cited
US4908032A
Cited
EP0295200A1
Cited
FR2634371A1
Cited
EP0393608A2
Cited
US5002581A
Cited
US5002578A
Cited
FR2685633A1
Cited
DE4320086A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-12-29 | 2001-06-30 | 2001-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-12-29 | 2005-06-30 | 2005-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-12-29 | 2009-06-30 | 2009-12-30 | $7700.00 | Window Closed / Lapsed |