EP0550814A2
Expired / Lapsed
EP
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Anchorage nail for the treatment of hollow bone fractures
Assignee: Stryker Trauma GmbH
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Filing: 1992-11-13
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Granted: —
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Expires: 2012-11-13
Abstract
Abstract An anchorage nail for the treatment of fractures of hollow bones is disclosed. It has a hollow shaft (10) with at least one transverse hole (28,30) disposed in a first end region (12), for receiving bone screws. In a second region (18), adjacent the driving end (24), a further transverse opening (26) is disposed. The nail is characterised in that the shaft is straight, with an other diameter smaller than the inner diameter of the cortical bone, and in that the transverse opening (26) in the second end region is elongated along the nail axis. An inner thread is formed in the second end region, extending into the transverse opening, for receiving a threaded pin (54,62) which may be brought into contact with the shaft of a bone screw (82) introduced through the transverse opening (26).
Inventors
- 👤 Jouwert Wilhelmus Jacobus Lucas Dr. Med. Stapert
- 👤 Klaus Friedrich Adolf Dipl.-Ing. Behrens
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 09:24
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/16; A61B17/17; A61B17/1725; A61B17/56; A61B17/58; A61B17/68; A61B17/72; A61B17/7233; A61B17/7241; A61B17/7216; A61B17/7225
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
139 words
A locking nail for the medical care of hollow bone fractures comprising a hollow nail shaft having a first end and a second end, at least a cross bore for receiving a bone screw at the first end and a further cross bore for a bone screw at the second end adjacent the driving end, characterized in that the nail shaft (10) is formed straight, having an outer diameter smaller than the inner diameter of the corticalis, a bore at the second end (18) is formed as an elongate bore (26) and an inner threaded portion is formed at the second end (18) which threaded portion extends into the elongate bore (26) for receiving a screw bolt (54, 62) which may be brought in contact with the shaft of the bone screw (82) extending through the elongate bore (26).
Claim 2
Dependent Claim
24 words
The locking nail of claim 1, characterized in that the headless screw bolt (54) comprises an inner hexagon (60) for applying a rotating tool.
Claim 3
Dependent Claim
68 words
The locking nail of claim 1 or 2, characterized in that a telescopic sleeve (40) is provided to be pushed on the nail shaft (10) from the driving end (24) which sleeve cooperates with stop means (32, 34) of the nail shaft (10) and non-rotatably connected thereto and that the telescopic sleeve (40) comprises at least a cross bore (46, 48) in alignment with said elongate bore (26).
Claim 4
Dependent Claim
47 words
The locking nail of claim 3, characterized in that the cross bore (46, 48) of the telescopic sleeve (40) is aligned with the end of the elongate bore (26) facing away from the driving end (24) when the telescopic sleeve (40) contacts the stop means (32, 34).
Claim 5
Dependent Claim
48 words
The locking nail of claim 3 or 4, characterized in that the nail shaft (10) comprises a pair of opposed flats (20, 22) in the region of the telescopic sleeve (40) and that the internal profile of the telescopic sleeve (40) at least partly corresponds in shape thereto.
Claim 6
Dependent Claim
25 words
The locking nail of claim 5, characterized in that the ends of the flats (20, 22) form stops (32, 34) for the telescopic sleeve (40).
Claim 7
Dependent Claim
36 words
The locking nail of one of claims 3 to 6, characterized in that the region of the nail shaft (10) being outside the telescopic sleeve (40) has a slightly smaller diameter than the remaining nail shaft.
Claim 8
Dependent Claim
24 words
The locking nail of one of claims 1 to 7, characterized in that the diameter of the nail shaft (10) is about 9 mm.
Claim 9
Dependent Claim
40 words
The locking nail of one of claims 1 to 8, characterized in that the wall thickness of the nail shaft (10) in the region of the stop means up to the elongate bore is larger than in the remaining region.
Claim 10
Dependent Claim
25 words
The locking nail of claims 7 and 8, characterized in that the diameter in the region of the telescopic sleeve (40) is about 10 mm.
Claim 11
Dependent Claim
29 words
The locking nail of one of claims 3 to 10, characterized in that the outer diameter of the telescopic sleeve (40) gradually tapers towards the stop means (32, 34).
Claim 12
Dependent Claim
33 words
The locking nail of one of claims 3 to 11, characterized in that the free end of the telescopic sleeve (40) comprises at least a recess (52) for engaging a positioning device (100).
Claim 13
Dependent Claim
34 words
The locking nail of one of claims 3 to 12, characterized in that the telescopic sleeve (40) comprises an internal thread portion (50) at its free end portion to receive a distracting screw (72).
Claim 14
Dependent Claim
29 words
The locking nail of claims 1 and 3, characterized in that the head (66) of the screw bolt (62) cooperates with the free end of the telescopic sleeve (40).
Claim 15
Dependent Claim
47 words
Redriving and extracting tool for a bone nail according to one of claims 1 to 14, characterized in that a tool shaft (148) comprises a forward external thread portion (152), a front-sided stop means (153) and a head (154) including a driving face at the opposite end.
Claim 16
Dependent Claim
25 words
The tool of claim 15, characterized in that the shaft (148) comprises a pair of opposed flats (156) to be engaged by a rotating tool.
Claim 17
Dependent Claim
102 words
A positioning device for a locking nail of one of claims 1 to 15, characterized in that a U-shaped structure (100) comprises a pair of legs and the web therebetween forming a handle (106), that a first leg (102) comprises a bore (108, 110) for accommodating a positioning or drilling sleeve and that the second leg (104) comprises a screwing connection to mount the nail shaft (10) or, respectively the telescopic sleeve (40), wherein the elongate bore (26) of the nail shaft (10) is aligned with the bore (108, 110) when the nail shaft (10) is mounted on the second leg (104).
Claim 18
Dependent Claim
60 words
The positioning device of claim 17, characterized in that the second leg (104) comprises an axial passage for receiving a nail holding screw (136) and that the cooperating ends of the second leg (104) and the nail shaft (110) define a connection fixed against rotation when the nail shaft is drawn towards the leg end by the holding screw (136).
Claim 19
Dependent Claim
44 words
The positioning device of claims 17 or 18, characterized in that a separate end piece (120) of selected length (adaptor) is provided for the second leg (104) which adaptor is mounted on the second leg (104) by a sleeve nut (126) or the like;
Claim 20
Dependent Claim
48 words
The positioning device of one of claims 17 to 19, characterized in that a tissue protecting sleeve (158) is received in the bore (108, 110) which sleeve may be fixed by a fixing screw (122) and that the tissue protecting sleeve (158) receives a drilling guide sleeve (166).
Claim 21
Dependent Claim
23 words
The positioning device of claim 20, characterized in that the drilling guide sleeve (166) is fixed in the protecting sleeve (158) by screwing.
Claim 22
Dependent Claim
45 words
Cortical screw, in particular for the locking nail of one of claims 1 to 14 comprising a head and a threaded shaft, characterized in that a threaded portion (86) is provided close to the head (84), while the remaining shaft (90) is free of threads.
Claim 23
Dependent Claim
29 words
The cortical screw of claim 22, characterized in that the threaded portion (86) comprises an axis parallel cutting groove (88) at the end facing away from the head (84).
Claim 24
Dependent Claim
27 words
The cortical screw of claim 22 or 23, characterized in that a pair of opposed drilling grooves (94) is provided at the tip (92) of the screw.
References Cited (Backward Citations)
No citation records indexed.
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