US4936860A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal scaphoid implant
Assignee: Wright Medical Technology Inc
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Filing: 1988-09-23
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Granted: 1990-06-26
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Expires: 2008-09-23
Abstract
Abstract A scaphoid implant surgically insertable adjacent the trapezium, the trapezoid, the lunate, the capitate and the radius bones includes a rigid, metal body. The body defines a capitate articulating surface, a radius articulating surface and a lunate articulating surface. A stem extends from an inferior surface of the body. The stem defines a trapezium engaging ledge. The ledge when implanted engages the trapezium to prevent vertical or dorsal movement of the implant out of the plane of the wrist. The body defines a bore for receiving a suture to prevent rotation at the scapholunate junction.
Inventors
- 👤 Alfred B. Swanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:42
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/42; A61F2/4261; A61F2002/4271; A61F2002/4287; A61F2002/4289; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00029
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
167 words
A scaphoid implant surgically insertable adjacent the trapezium, the trapezoid, the lunate, the capitate and the radius, said implant adapted to cooperate with a pocket formed surgically in a palmar surface of the trapezium, said implant comprising: an elongated body, said body defining: an inferior surface having a generally triangular shape in plan and including an apex and a base; an external surface extending from said inferior surface and having a generally concave shape in plan; an internal surface extending from said inferior surface, said external and internal surfaces joining to define a dorsal edge and a proximal edge, said dorsal edge being smoothly curved and extending generally from said inferior surface apex to said proximal edge; and a stem extending distally from said inferior surface at said base, said stem adapted to extend under the trapezium and said stem defining a trapezium ledge, said ledge dimensioned to engage a surgically formed pocket in the palmar surface of the trapezium to prevent rotary movement of the implant.
Claim 2
Dependent Claim
167 words
A scaphoid implant surgically insertable adjacent the trapezium, the trapezoid, the lunate, the capitate and the radius, said implant adapted to cooperate with a pocket formed surgically in a palmar surface of the trapezium, said implant comprising: an elongated body, said body defining: an inferior surface having a generally triangular shape in plan and including an apex and a base; an external surface extending from said inferior surface and having a generally concave shape in plan; an internal surface extending from said inferior surface, said external and internal surfaces joining to define a dorsal edge and a proximal edge, said dorsal edge being smoothly curved and extending generally from said inferior surface apex to said proximal edge; and a stem extending distally from said inferior surface at said base, said stem adapted to extend under the trapezium and said stem defining a trapezium ledge, said ledge dimensioned to engage a surgically formed pocket in the palmar surface of the trapezium to prevent rotary movement of the implant.
Claim 3
Dependent Claim
22 words
A scaphoid implant as defined by claim 1 wherein said internal surface defines a concave capitate recess and a curved lunate surface.
Claim 4
Dependent Claim
22 words
A scaphoid implant as defined by claim 2 wherein said capitate recess has a generally curved, V shape in horizontal cross section.
Claim 5
Dependent Claim
47 words
A scaphoid implant as defined by claim 1 wherein said body further defines: a palmar surface which is generally semi-lunar shaped in plan and is bonded by a palmar edge of said internal surface, a palmar edge of said external surface, said proximal edge and said stem.
Claim 6
Dependent Claim
47 words
A scaphoid implant as defined by claim 2 wherein said body further defines: a palmar surface which is generally semi-lunar shaped in plan and is bonded by a palmar edge of said internal surface, a palmar edge of said external surface, said proximal edge and said stem.
Claim 7
Dependent Claim
47 words
A scaphoid implant as defined by claim 3 wherein said body further defines: a palmar surface which is generally semi-lunar shaped in plan and is bonded by a palmar edge of said internal surface, a palmar edge of said external surface, said proximal edge and said stem.
Claim 8
Dependent Claim
15 words
A scaphoid implant as defined by claim 1 wherein said body defines a bore therethrough.
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) | 1993-06-25 | 1993-12-25 | 1994-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-25 | 1997-12-25 | 1998-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-25 | 2001-12-25 | 2002-06-26 | $7700.00 | Window Closed / Lapsed |