US3891998A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Endoprosthetic shoulder joint
Assignee: National Research Development Corp UK
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Filing: 1974-01-07
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Granted: 1975-07-01
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Expires: 1994-01-07
Abstract
Abstract An endoprosthetic scapular glenoid component is provided with a concave bearing surface of elongated part-spherical shape significantly less than hemispherical extent. The surface forms the larger end face of a generally frusto-pyramidal body of which the side faces have a relieved structure for fixation in the scapular with gap-filling cement. The pyramidal body is preferably quadrilateral with two opposed planar side faces and the other two convexly rounded. For use in a total shoulder joint device, the glenoid component can be associated with a variety of generally spherically headed, intramedullary stemmed, humeral components. Preferably the humeral component head is of minor segmental form, and the stem inclined relative to the head over a major free end portion of its length.
Inventors
- 👤 William Murdoch Lennox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:50
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/40; A61F2/4059; A61F2/4081; A61F2/30767; A61F2/30771; A61F2002/3082; A61F2002/30822; A61F2002/30827; A61F2/4014; A61F2002/4018; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00029
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
66 words
An endoprosthetic scapular glenoid component comprising a single body of genErally frusto-pyramidal overall shaping, said body having its wider end face dished to define a concave bearing surface of substantially part-spherical shaping to an extent significantly less than hemispherical, and having an elongated circumferential form, and the side surfaces of said body being formed with a low-relief structure to afford a key for a gapfilling medium.
Claim 2
Dependent Claim
66 words
An endoprosthetic scapular glenoid component comprising a single body of genErally frusto-pyramidal overall shaping, said body having its wider end face dished to define a concave bearing surface of substantially part-spherical shaping to an extent significantly less than hemispherical, and having an elongated circumferential form, and the side surfaces of said body being formed with a low-relief structure to afford a key for a gapfilling medium.
Claim 3
Dependent Claim
14 words
A component according to claim 1 wherein said pyramidal shaping is of quadrilateral form.
Claim 4
Dependent Claim
26 words
A component according to claim 2, wherein said quadrilateral form comprises two like opposed planar side faces and two like opposed convexly circularly rounded side faces.
Claim 5
Dependent Claim
42 words
A component according to claim 3, wherein said low relief structure comprises at least two grooves extending laterally around the side faces of said pyramidal shaping, and at least one further groove extending longitudinally between said two grooves to communicate the same.
Claim 6
Dependent Claim
87 words
An endoprosthetic shoulder joint device comprising a scapular glenoid component according to claim 1 and a humeral component, said humeral component including a head part having a convex bearing surface in mutual articulating bearing engagement with said concave bearing surface, which convex bearing surface is of at least approximately part-spherical form of significantly greater circumferential extent than, and with a range of curvature including that of, said concave bearing surface, and said head part being adapted remotely from said convex bearing surface for fixation to the humerus.
Claim 7
Dependent Claim
34 words
A device according to claim 5 wherein said convex bearing surface is of substantially spherical segment shape with like radius as said concave bearing surface and a circumferential extent not greater than hemispherical extent.
Claim 8
Dependent Claim
20 words
A device according to claim 6 wherein said segment shape extent is equivalent to about a one third spherical area.
Claim 9
Dependent Claim
52 words
A device according to claim 5 wherein said humeral component is adapted for fixation to the humerus by the provision of an elongate intramedullary stem extending from said head part, remotely from said convex bearing surface, which stem is inclined relative to said head part over a major, free end portion thereof.
Claim 10
Dependent Claim
123 words
An endoprosthetic shoulder joint device comprising: a scapular glenoid component as a single body of generally frusto-pyramidal overall shaping having its wider end face dished to define a concave bearing surface of part-spherical shaping to an extent significantly less than hemispherical, and the side surfaces of said body being formed with a low-relief structure to afford a key for a gap-filling medium; and a humeral component including a head part defining a convex, part-spherically shaped bearing surface of significantly greater extent than, and in mutually articulatory engagement with, said concave bearing surface, and an elongated intramedullary stem extending from said head part, remotely from said convex bearing surface, which stem is inclined relative to said head over a major free end portion thereof.
Claim 11
Dependent Claim
123 words
An endoprosthetic shoulder joint device comprising: a scapular glenoid component as a single body of generally frusto-pyramidal overall shaping having its wider end face dished to define a concave bearing surface of part-spherical shaping to an extent significantly less than hemispherical, and the side surfaces of said body being formed with a low-relief structure to afford a key for a gap-filling medium; and a humeral component including a head part defining a convex, part-spherically shaped bearing surface of significantly greater extent than, and in mutually articulatory engagement with, said concave bearing surface, and an elongated intramedullary stem extending from said head part, remotely from said convex bearing surface, which stem is inclined relative to said head over a major free end portion thereof.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-30 | 1978-12-30 | 1979-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-30 | 1982-12-30 | 1983-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-30 | 1986-12-30 | 1987-07-01 | $7700.00 | Window Closed / Lapsed |