US4628920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Intramedullary nail
Assignee: Synthes USA LLC
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Filing: 1985-03-29
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Granted: 1986-12-16
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Expires: 2005-03-29
Abstract
Abstract A intramedullary nail of the type adapted to receive a conical drive connection is provided with a slot which extends from the tip to the head for improved elasticity. A locking section is provided at the head to avoid the nail spreading apart when a conical drive connection is used. The nail has a threaded conical socket to receive a drive connection and the thread is shaped to minimize radial forces resulting from driving bolt being screwed into the socket.
Inventors
- 👤 Robert Mathys, Jr.
- 👤 Anton Cotting
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:47
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/72; A61B17/7283
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
65 words
An intramedullary nail comprising a hollow body having a peripheral wall, a tip for insertion into a bone, a head adapted to receive a drive connection and a slot extending from said tip to said head, the slot having a section adjacent said head with a configuration locking together the edges of the body wall on opposite sides thereof to prevent spreading of the body.
Claim 2
Dependent Claim
65 words
An intramedullary nail comprising a hollow body having a peripheral wall, a tip for insertion into a bone, a head adapted to receive a drive connection and a slot extending from said tip to said head, the slot having a section adjacent said head with a configuration locking together the edges of the body wall on opposite sides thereof to prevent spreading of the body.
Claim 3
Dependent Claim
17 words
The nail claimed in claim 1, wherein the configuration of said slot section includes a zig-zag bend.
Claim 4
Dependent Claim
21 words
The nail claimed in claim 2 wherein the configuration of said slot section includes two zig-zag bends forming a dove-tailed joint.
Claim 5
Dependent Claim
38 words
The nail claimed in claim 1, wherein the head is widened conically and is threaded internally to provide a drive connection and at least a part of said slot section lies in the widened part of said head.
Claim 6
Dependent Claim
27 words
The nail claimed in claim 4 wherein the thread is trapezoidal in cross-section with the side walls having an included angle of from 0° to about 45°.
Claim 7
Dependent Claim
13 words
The nail claimed in claim 5 wherein the included angle is about 10°.
Claim 8
Dependent Claim
50 words
The nail claimed in claim 1, wherein the middle section of the nail is rod shaped in profile and is generally round in cross-section, the section of said slot in which the wall edges are locked together lying at least in part in the rod shaped section of the nail.
Claim 9
Dependent Claim
34 words
The nail claimed in claim 1, in which the section of the slot in which the wall eges are locked together is substantially reduced in width compared to the adjacent section of the slot.
Claim 10
Dependent Claim
95 words
An intramedullary nail comprising an elongated hollow body having a peripheral wall and a central axis, a tip for insertion into a bone, a head having a threaded conical socket for receiving a drive connection, the internal walls of said socket making an angle between about 2° and 10° with the central axis of the nail, and a slot extending from said tip to said head, the slot having a section adjacent said head with a configuration locking together the edges of the body wall on opposite sides thereof to prevent spreading of the body.
Claim 11
Dependent Claim
95 words
An intramedullary nail comprising an elongated hollow body having a peripheral wall and a central axis, a tip for insertion into a bone, a head having a threaded conical socket for receiving a drive connection, the internal walls of said socket making an angle between about 2° and 10° with the central axis of the nail, and a slot extending from said tip to said head, the slot having a section adjacent said head with a configuration locking together the edges of the body wall on opposite sides thereof to prevent spreading of the body.
Claim 12
Dependent Claim
27 words
The nail claimed in claim 9 wherein the side walls of the thread make a small angle with a line normal to the axis of the nail.
Claim 13
Dependent Claim
12 words
The nail claimed in claim 9 wherein the angle is about 5°.
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) | 1989-12-15 | 1990-06-16 | 1990-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-15 | 1994-06-16 | 1994-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-15 | 1998-06-16 | 1998-12-16 | $7700.00 | Window Closed / Lapsed |