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US4817591A
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Intramedullary nail
Assignee: SYNTHES
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Filing: 1987-08-06
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Granted: 1989-04-04
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Expires: 2007-08-06
Abstract
Abstract An intramedullary nail has a tip portion provided with means for engaging a bolt previously inserted into a bone transverse to the bone axis.
Inventors
- 👤 Kaj Klaue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:03
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/72; A61B17/7233; A61B17/7283; A61B17/725; A61B17/7258; A61B17/7266
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
166 words
An intramedullary buttressing nail for stabilizing the position of bone fragments subsequent to the reduction of a bone fracture, said nail having a main body, a head and a tip for insertion into the medulla of a bone along the axis of the bone, the tip of said nail having a portion which is reduced in cross-sectional area with respect to the main body for insertion between two bolts previously inserted through the bone approximately parallel to one another and transverse to the long axis of the bone on the distal side of the fracture, said nail further having opposing shoulders at the juncture of said reduced portion and said main body of said nail, said shoulders being inwardly arcuately curved to seat said transverse bolts, thus limiting travel of the distal fragment of the bone in the proximal direction to avoid shortening of the bone during healing; and means in said nail for receiving a further bolt for fixing said nail relative to the bone.
Claim 2
Dependent Claim
166 words
An intramedullary buttressing nail for stabilizing the position of bone fragments subsequent to the reduction of a bone fracture, said nail having a main body, a head and a tip for insertion into the medulla of a bone along the axis of the bone, the tip of said nail having a portion which is reduced in cross-sectional area with respect to the main body for insertion between two bolts previously inserted through the bone approximately parallel to one another and transverse to the long axis of the bone on the distal side of the fracture, said nail further having opposing shoulders at the juncture of said reduced portion and said main body of said nail, said shoulders being inwardly arcuately curved to seat said transverse bolts, thus limiting travel of the distal fragment of the bone in the proximal direction to avoid shortening of the bone during healing; and means in said nail for receiving a further bolt for fixing said nail relative to the bone.
Claim 3
Dependent Claim
25 words
The nail claimed in claim 1 and comprising grooves at end of said reduced portion nearest the head of the nail, for receiving said bolts.
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) | 1992-04-03 | 1992-10-03 | 1993-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-03 | 1996-10-03 | 1997-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-03 | 2000-10-03 | 2001-04-04 | $7700.00 | Window Closed / Lapsed |