US4423721A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for insertion and extraction of medullary nails
Assignee: WOLF-DIETER OTTE
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Filing: 1979-09-04
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Granted: 1984-01-03
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Expires: 1999-09-04
Abstract
Abstract A metallic device for the insertion and extraction of medullary nails having a guide tube (1) which is comprised of two successive longitudinal sections (2 and 3). Striking elements (7 and 11) are disposed on opposite ends of the tube and a displaceable strike bushing (6) is located on the tube between the striking elements.
Inventors
- 👤 Wolf-Dieter Otte
- 👤 Heinz Otte
- 👤 Siegfried Schider
- 👤 Otto Wiesner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:52
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/88; A61B17/92; A61B17/921; B; B25; B25D; B25D1/00; B25D1/16; A61B2017/922
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
225 words
In a metallic device for insertion and extraction of medullary nails, comprising a guide tube (1) with striking elements (7,9) on both ends thereof, a displaceable strike bushing (6) disposed concentrically and slidably relative to said guide tube, said striking elements being removable from said guide tube, the improvement comprising the end of the guide tube towards the medullary nail has a doubly reduced diameter in two successive longitudinal sections (2,3), said tube diameter diminishing to the diameter of the successive section at each transition between the individual longitudinal sections; the end longitudinal section (3) towards the medullary nail having the smallest diameter and being threaded; the intermediate longitudinal section, between said guide tube and said end section, having concentrically disposed thereabout one of said striking elements, said striking element including an insertion sleeve (7) which is with said striking element slidably displaceable on said intermediate section; during insertion of said nail, said insertion sleeve bears against the end face of said nail and delivers directly thereto the force imported by striking said striking element with said strike bushing; said strike bushing being made from a composition having a density greater then 10 g/cm.sup. 3 wherein said composition is a material selected from the group consisting of a sintered composite of principally tungsten with metalic binders or a metal powder encased in a steel jacket.
Claim 2
Dependent Claim
225 words
In a metallic device for insertion and extraction of medullary nails, comprising a guide tube (1) with striking elements (7,9) on both ends thereof, a displaceable strike bushing (6) disposed concentrically and slidably relative to said guide tube, said striking elements being removable from said guide tube, the improvement comprising the end of the guide tube towards the medullary nail has a doubly reduced diameter in two successive longitudinal sections (2,3), said tube diameter diminishing to the diameter of the successive section at each transition between the individual longitudinal sections; the end longitudinal section (3) towards the medullary nail having the smallest diameter and being threaded; the intermediate longitudinal section, between said guide tube and said end section, having concentrically disposed thereabout one of said striking elements, said striking element including an insertion sleeve (7) which is with said striking element slidably displaceable on said intermediate section; during insertion of said nail, said insertion sleeve bears against the end face of said nail and delivers directly thereto the force imported by striking said striking element with said strike bushing; said strike bushing being made from a composition having a density greater then 10 g/cm.sup. 3 wherein said composition is a material selected from the group consisting of a sintered composite of principally tungsten with metalic binders or a metal powder encased in a steel jacket.
Claim 3
Dependent Claim
81 words
A device according to claim 1, wherein the striking element (9) disposed at the end of the guide tube (1) farthest away from the medullary nail comprises a two-piece sleeve (8) of larger outside diameter than that of said guide tube (1), the sleeve (8) being placed on a longitudinal section (4) of the guide tube (1) recessed to a smaller diameter, and a clamping sleeve (9) slipped over said sleeve (8) with a collar directed toward the striking bushing (6).
Claim 4
Dependent Claim
38 words
A device according to claim 2, wherein the clamping sleeve (9) is comprised of a spring tongue (10) which exerts pressure on said two-piece sleeve (8) and retains same on said recessed longitudinal section of the guide tube.
Claim 5
Dependent Claim
24 words
A device according to claim 1, wherein the end (5) of the guide tube (1) farthest from the medullary nail has a hexagonal form.
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) | 1987-01-02 | 1987-07-04 | 1988-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-02 | 1991-07-04 | 1992-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-02 | 1995-07-04 | 1996-01-03 | $7700.00 | Window Closed / Lapsed |