US3909853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Endoprosthetic wrist joint
Assignee: National Research Development Corp UK
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Filing: 1974-05-15
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Granted: 1975-10-07
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Expires: 1994-05-15
Abstract
Abstract An endoprosthetic wrist joint device is provided having: a radial component formed by a tapered intramedullary stem with a part-annular, spherically-shaped socket at its wider end; a carpal component including a spherical ball with opposed flats allowing free entry into the radial socket for captive articulatory engagement therewith when twisted, and an elongated member joined to the ball by a neck to form a T-shape, such member having a longitudinal slot remote from the ball and of circular arcuate cross-section; and a plurality of metacarpal components each including a spherical ball slid into the slot and having a pin stem extending from the ball out of the slot.
Inventors
- 👤 William Murdoch Lennox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:49
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/42; A61F2/4261
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
151 words
In an endoprosthetic wrist joint device including: a first component having a stem terminating at one end in a bearing part; a second component having a first bearing part engageable with the bearing part of said first component in a mutually articulatory manner, and having a second bearing part; and a plurality of similar third components each having a stem terminating at one end in a bearing part engageable with the second bearing part of said second component in an individual mutually articulatory manner; the method of providing an endoprosthetic wrist joint function which method comprises: securing the stem of said first component in the radius bone, securing said third component stems in respectively individual metacarpal bones, substituting said second component for carpal bones, and locating said second component to bring said first and second bearing parts respectively into said mutually articulatory engagements with said first and third component bearing parts.
Claim 2
Dependent Claim
151 words
In an endoprosthetic wrist joint device including: a first component having a stem terminating at one end in a bearing part; a second component having a first bearing part engageable with the bearing part of said first component in a mutually articulatory manner, and having a second bearing part; and a plurality of similar third components each having a stem terminating at one end in a bearing part engageable with the second bearing part of said second component in an individual mutually articulatory manner; the method of providing an endoprosthetic wrist joint function which method comprises: securing the stem of said first component in the radius bone, securing said third component stems in respectively individual metacarpal bones, substituting said second component for carpal bones, and locating said second component to bring said first and second bearing parts respectively into said mutually articulatory engagements with said first and third component bearing parts.
Claim 3
Dependent Claim
108 words
An endoprosthetic wrist joint device comprising: a radial component having a fixation part for securement with the radius, and a bearing part; a carpal component having a first bearing part connected with said radial bearing part in mutually articulatory ball-and-socket bearing engagement, and a second bearing part in the form of an open-ended elongated slot having a uniform circular arcuate cross-sectional shape; and a plurality of metacarpal components each having a fixation part for securement to a respectively individual metacarpal, and each having a bearing part defining a convex spherically shaped surface located in said slot from one end thereof to provide individual ball-and-socket mutually articulatory bearing engagement.
Claim 4
Dependent Claim
108 words
An endoprosthetic wrist joint device comprising: a radial component having a fixation part for securement with the radius, and a bearing part; a carpal component having a first bearing part connected with said radial bearing part in mutually articulatory ball-and-socket bearing engagement, and a second bearing part in the form of an open-ended elongated slot having a uniform circular arcuate cross-sectional shape; and a plurality of metacarpal components each having a fixation part for securement to a respectively individual metacarpal, and each having a bearing part defining a convex spherically shaped surface located in said slot from one end thereof to provide individual ball-and-socket mutually articulatory bearing engagement.
Claim 5
Dependent Claim
89 words
A device according to claim 2 wherein: said radial bearing part and said carpal first bearing part define mutually complementary convex and concave bearing surfaces of symmetrical, part-annular, spherically-segmental shape; said concave shape subtends in its annular plane an angle at its spherical centre less than the companion angle of said convex shape, but greater than 180* ; and said concave and convex shapes subtend respective companion angles at their spherical centres, in directions perpendicular to their annular planes, which respective angles total not more than 180* when summed.
Claim 6
Dependent Claim
24 words
A device according to claim 3 wherein said radial bearing part and said carpal first bearing part respectively define said concave and convex surfaces.
Claim 7
Dependent Claim
114 words
An endoprosthetic wrist joint device comprising: a radial component having a fixation part for securement with the radius, and a bearing part; a generally T-shaped carpal component having a first bearing part connected with said radial bearing part in mutually articulatory ball-and-socket bearing engagement, a necked part extending from said first bearing part, and an elongated second bearing part connected at an intermediate location therealong to said necked part and extending transversely relative to said necked part; and a plurality of metacarpal components each having a fixation part for securement to a respectively individual metacarpal, and each having a bearing part connected with said second bearing part in individual mutually articulatoRy ball-and-socket bearing engagement.
Claim 8
Dependent Claim
114 words
An endoprosthetic wrist joint device comprising: a radial component having a fixation part for securement with the radius, and a bearing part; a generally T-shaped carpal component having a first bearing part connected with said radial bearing part in mutually articulatory ball-and-socket bearing engagement, a necked part extending from said first bearing part, and an elongated second bearing part connected at an intermediate location therealong to said necked part and extending transversely relative to said necked part; and a plurality of metacarpal components each having a fixation part for securement to a respectively individual metacarpal, and each having a bearing part connected with said second bearing part in individual mutually articulatoRy ball-and-socket bearing engagement.
Claim 9
Dependent Claim
111 words
An endoprosthetic wrist joint device comprising: a radial component having a bearing part and a fixation part for securement with the radius, which fixation part is in the form of an elongated tapered stem longitudinally extending, at its wider end, from said bearing part in transversely off-set manner; a carpal component having a first bearing part connected with said radial bearing part in mutually articulatory ball-and-socket bearing engagement, and a second bearing part; and a plurality of metacarpal components each having a fixation part for securement to a respectively individual metacarpal, and each having a bearing part connected with said carpal second bearing part in individual mutually articulatory ball-and-socket bearing engagement.
Claim 10
Dependent Claim
111 words
An endoprosthetic wrist joint device comprising: a radial component having a bearing part and a fixation part for securement with the radius, which fixation part is in the form of an elongated tapered stem longitudinally extending, at its wider end, from said bearing part in transversely off-set manner; a carpal component having a first bearing part connected with said radial bearing part in mutually articulatory ball-and-socket bearing engagement, and a second bearing part; and a plurality of metacarpal components each having a fixation part for securement to a respectively individual metacarpal, and each having a bearing part connected with said carpal second bearing part in individual mutually articulatory ball-and-socket bearing engagement.
Claim 11
Dependent Claim
101 words
An endoprosthetic bone joint device comprising: first and second components having respective first and second bearing parts connected in mutually articulatory ball-and-socket bearing engagement; said bearing parts respectively defining mutually complementary convex ball and concave socket bearing surfaces of symmetrical, part-annular, spherically-segmental shape; said concave shape subtending in its annular plane an angle at its spherical centre less than the companion angle of said convex shape but greater than 180*; and said convex and concave shapes subtending respective companion angles at their spherical centres, in directions perpendicular to their annular planes, which respective angles total not more than 180* when summed.
Claim 12
Dependent Claim
101 words
An endoprosthetic bone joint device comprising: first and second components having respective first and second bearing parts connected in mutually articulatory ball-and-socket bearing engagement; said bearing parts respectively defining mutually complementary convex ball and concave socket bearing surfaces of symmetrical, part-annular, spherically-segmental shape; said concave shape subtending in its annular plane an angle at its spherical centre less than the companion angle of said convex shape but greater than 180*; and said convex and concave shapes subtending respective companion angles at their spherical centres, in directions perpendicular to their annular planes, which respective angles total not more than 180* when summed.
Claim 13
Dependent Claim
95 words
An endoprosthetic bone joint device comprising: a first component having a bearing part defining a bearing surface in the form of an open-ended elongate slot having uniform arcuate cross-sectional shape subtending an angle at its centre greater than 180*; a plurality of second components each including a bearing part in the form of a ball and a fixation part in the form of a stem projecting from said ball; each said ball being slidably received in said slot from one end thereof, with the respective stem extending through said slot in captive mutually articulatory engagement.
Claim 14
Dependent Claim
95 words
An endoprosthetic bone joint device comprising: a first component having a bearing part defining a bearing surface in the form of an open-ended elongate slot having uniform arcuate cross-sectional shape subtending an angle at its centre greater than 180*; a plurality of second components each including a bearing part in the form of a ball and a fixation part in the form of a stem projecting from said ball; each said ball being slidably received in said slot from one end thereof, with the respective stem extending through said slot in captive mutually articulatory engagement.
Claim 15
Dependent Claim
30 words
A device according to claim 8 wherein said slot is longitudinally convexly curved and has an opening portion leading to said arcuate cross-sectional shape, which portion is inwardly convergently tapered.
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) | 1978-10-06 | 1979-04-07 | 1979-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-06 | 1983-04-07 | 1983-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-06 | 1987-04-07 | 1987-10-07 | $7700.00 | Window Closed / Lapsed |