Source: http://www.google.de/patents/US4565193
Timestamp: 2013-05-18 09:22:08
Document Index: 337547099

Matched Legal Cases: ['Application No. 2', 'art 2', 'art 2', 'art 2', 'art 2', 'art 2', 'art 2']

Patent US4565193 - Pronged plate for resetting fractured bones - Google PatenteSuche Bilder Maps Play YouTube News Gmail Drive Mehr » Erweiterte Patentsuche | Webprotokoll | Anmelden Erweiterte Patentsuche PatenteA pronged plate for fixing bone parts together at a bone fracture in the region of an articulation has prongs projecting transversely from one end of the plate, which is elongate to lie along a limb bone, and has perforations to receive securing screws to be screwed into the bone. To prevent the articular...http://www.google.de/patents/US4565193?utm_source=gb-gplus-sharePatent US4565193 - Pronged plate for resetting fractured bones Ver�ffentlichungsnummerUS4565193 APublikationstypErteilung Anmeldenummer06/531,905 Ver�ffentlichungsdatum21. Jan. 1986Eingetragen12. Sept. 1983 Priorit�tsdatum13. Sept. 1982 ErfinderElke StreliUrspr�nglich Bevollm�chtigterStreli; Elke US-Klassifikation606/297606/75606/67Internationale KlassifikationA61B17/80A61B17/74A61B17/68 UnternehmensklassifikationA61B17/74A61B17/809 Europ�ische KlassifikationA61B 17/80SA61B 17/74ReferenzenPatentzitate (9) Referenziert von (94)Externe LinksUSPTO USPTO-Zuordnung EspacenetPronged plate for resetting fractured bonesUS 4565193 A Zusammenfassung A pronged plate for fixing bone parts together at a bone fracture in the region of an articulation has prongs projecting transversely from one end of the plate, which is elongate to lie along a limb bone, and has perforations to receive securing screws to be screwed into the bone. To prevent the articular part of the bone from slipping off the prongs when loaded in use, the axes of the prongs are arranged to make an angle of about 20 part of the plate and contains the longitudinal axis of the plate.
What is claimed is: 1. A pronged article for fixing bone parts in position together at a bone fracture in the region of an articulation, comprising an elongated plate having a longitudinal axis and adapted to lie along one of said bone parts, said plate being transverse to a longitudinal plane including said axis and having a plurality of prongs projecting transversely from one end of the plate, said plate having a plurality of apertures formed therein for receiving plate fixating means for securing said plate to said one of said bone parts, said plate being characterised by the improvement wherein the axes of said prongs, when extended to intersect said longitudinal plane, each include angles of between 10 longitudinal plane.
2. A pronged article claimed in claim 1 wherein said axes of said prongs adjacent said plate are substantially coplanar in a further plane which intersects said longitudinal plane with an included angle of less than 90
3. A pronged article as claimed in claim 2 wherein said included angle of said further plane is an angle of 80
11. A pronged article as claimed in claim 1 said axes of said prongs lie generally in a transverse plane which includes an angle of 65 80
13. A pronged article as claimed in claim 1 wherein said angle included by the axes of said prongs with said plane is an angle of about 20
FIELD OF THE INVENTION The invention relates to a pronged plate for fixing bone parts together in position in the case of bone fractures in the region of an articulation, having prongs projecting transversely from one end of the plate and having apertures for receiving screws or the like.
BACKGROUND OF THE INVENTION To reposition, i.e. reset, a bone in the case of a bone fracture in the region of an articulation, it is known to apply a plate to the surface of the fractured bone, which plate extends across the fracture, is formed at one end with transversely projecting prongs and is therefore called a pronged plate. The prongs are here inserted into the articular head and the plate itself is fixed by means of screws to the shaft of the bone. For bone fractures, pronged plates of this type have the function of fixing the bone parts against changes in position, to thus enable the fracture to heal with the bone parts in the correct position and additionally to accelerate the healing process.
In the pronged plates known from German Auslegeschrift No. 2,602,900, French Patent Specification No. 1,487,486 and French Published Application No. 2,064,530, the prongs extend approximately parallel to the perpendicular plane through the longitudinal axis of the plate, the prongs projecting from the plate part at an angle of about 70 120 of the fragment of the articular head sliding off from the prongs when the bone is put under load. This is the case particularly if the bone parts have a porous, i.e. spongy structure, or there is crushed bone or the contact surface is small or there is little room available for fixing the plate by means of the prongs, as is the case, for example, with fractures in the region of the end remote from the body, i.e. the distal end, of radius bones.
OBJECT OF THE INVENTION It is therefore an object of the invention to provide a pronged plate, with which the secure fixing of the bone parts in position is possible even in the cases listed above.
SUMMARY OF THE INVENTION According to the invention, this is achieved when the axes of the prongs include angles of between 10 20 plate and includes the longitudinal axis of the plate. Such an alignment of the prongs prevents the articular part of the bone from sliding off the prongs.
Preferably, the prongs here enclose an angle of less than 90 particular an angle of 80 with the plate, i.e. a second plane including the axis but transverse to the first plane. In combination with a screw, which is likewise inserted in the articular part of the fragment, optimum fixing of the articular part of the plate can be achieved in this way.
At least one apertures for receiving a screw which can be inserted into the articular part can be located in the region directly adjacent to the prongs. A screw providing additional fixing of position can be introduced through this perforation into the articular part. The external support at the site of fracture requires additional fixing in the form of bracing by means of the screw especially if the articular part has been crushed or if the structure of the bone in the region of fracture is particularly porous. Provided that this screw encloses an angle of between 45 and 20 spongy bone fragments can become compressed and stabilised between the prongs and the plate.
BRIEF DESCRIPTION OF THE DRAWING FIG. 1 shows a pronged plate according to the invention, in longitudinal section along the line I--I of FIG. 2,
SPECIFIC DESCRIPTION As can be seen from FIG. 1, a pronged plate 1 according to the invention has a longitudinally extending, slightly curved part 2 which is formed with holes 3 for the insertion of screws. In its end region which is at the top in the drawing, the plate 1 is provided with four prongs 5 projecting at an angle of about 80 has a width which increases towards the prongs 5. Moreover, it is formed with five apertures 3, the lowest perforation 3a having the shape of a slot.
As can be seen from FIG. 3, the prongs 5 include angle α of about 20 the plate 1 and is generally perpendicular to the part 2, in contact with the shaft of the bone, of the plate 1. The axes of the prongs are longitudinal axes angularly extends from a face of a plate and generally lying in a plane transverse to the axis of the plate. The axes of these prongs define the angle α with the first axial plane as defined above. This effectively prevents the articular part from sliding off the prongs 5. For use on the right half or left half of the body, the prongs 5 can point respectively to one side or the other relative to the part 2, so that it is possible to speak of left-handed or right-handed pronged plates 1.
The plate 1 is fixed in such a way that initially bores for the prongs 5 are made in the fragment 13 with the aid of an aiming device, whereupon the prongs 5 are knocked into the fragment 13. Thereupon the plate part 2 of the plate 1 is fixed to the shaft 12 of the radius 10 by means of a screw passing through the lowest perforation 3a shaped as a slot. After checking the position of the plate 1 on the X-ray screen, a slight change of position of the plate 1 relative to the shaft 12 can be carried out by means of the slot 3a. Screws are then inserted through the remaining holes 3 into the shaft 12 of the bone. In doing this, the direction of the screw located nearest the prongs 5 is in particular selected according to the requirements of the particular fracture, i.e. in such a way, in the illustrative embodiment, that this screw includes an angle of about 30
Additionally, it is pointed out that the plate part 2 can also be formed with a lateral lug 21 which is likewise provided with a bore 22. In FIG. 2, this lug 21 is shown. This lug 21 projects from the plate part 2, is curved and has such a length that the bone 10 is surrounded over about 90
The second plane 30 in which approximately the prongs 5 lie includes an angle β of 65 bores 3 and the axis of the plate.
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Mai 2006Hand Innovations, LlcEndosteal nailDrehenOriginalbildGoogle-Startseite - Sitemap - USPTO-Bulk-Downloads - Datenschutzerkl�rung - Nutzungsbedingungen - �ber Google Patente - Feedback gebenDaten bereitgestellt von IFI CLAIMS Patent Services.© 2012 Google