US4667663A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Intramedullary nail used to unite separated fragments of fractured long bone
Assignee: Individual
•
Filing: 1984-07-13
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Granted: 1987-05-26
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Expires: 2004-07-13
Abstract
Abstract Disclosed is an intramedullary nail used to unite the separated fragments of a fractured long bone. It has a C-shaped bar-like appearance having a flat front section seen from the direction of insertion as well as a connecting part and, if necessary, a slit in its distal portion. The flat section prevents the rotation of the nail and supports load; the connecting part is used to extract the nail out from the medullary canal; and a stopper for prevention of the rotation is attached to the slit. Such a nail exhibits a stable fixing effect.
Inventors
- 👤 Keizo Miyata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:30
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/72; A61B17/7216; A61B17/7225; A61B17/7208; A61B17/7233; A61B17/7258; A61B17/7266
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
155 words
A C-shaped bar-like intramedullary nail for a fractured femur, comprising: an elongated shaft having a longitudinal curve wherein said curve is a two dimensional curve, whereby said shaft is straight when seen along a radial line of said curve; a front insertion end of said shaft, said front end having a flat section defining a direction transverse to both a longitudinal direction of said shaft and a radial line of said curve, said flat section having a width in said transverse direction which is greater than a width of said shaft in said transverse direction, wherein said flat section is tapered in said transverse direction, said taper narrowing toward said front end, and wherein said front end forms a flat end surface; a back insertion end of said shaft, said back end including means for extracting said nail from a bone; and a radially extending bulge on a radially inner surface of said flat section.
Claim 2
Dependent Claim
155 words
A C-shaped bar-like intramedullary nail for a fractured femur, comprising: an elongated shaft having a longitudinal curve wherein said curve is a two dimensional curve, whereby said shaft is straight when seen along a radial line of said curve; a front insertion end of said shaft, said front end having a flat section defining a direction transverse to both a longitudinal direction of said shaft and a radial line of said curve, said flat section having a width in said transverse direction which is greater than a width of said shaft in said transverse direction, wherein said flat section is tapered in said transverse direction, said taper narrowing toward said front end, and wherein said front end forms a flat end surface; a back insertion end of said shaft, said back end including means for extracting said nail from a bone; and a radially extending bulge on a radially inner surface of said flat section.
Claim 3
Dependent Claim
14 words
The nail of claim 1, wherein said shaft is a polygon in transverse section.
Claim 4
Dependent Claim
19 words
The nail of claim 2, wherein said polygon is a trapezoid having a longer side at said inner surface.
Claim 5
Dependent Claim
14 words
The nail of claim 1, wherein said means for extracting comprises a longitudinal slot.
Claim 6
Dependent Claim
25 words
The nail of claim 4 including a stopper to be inserted in said slot, wherein said slot is longer than the width of said stopper.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-05-25 | 1990-11-24 | 1991-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-25 | 1994-11-24 | 1995-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-25 | 1998-11-24 | 1999-05-26 | $7700.00 | Window Closed / Lapsed |