Source: http://www.google.fr/patents/US6146383
Timestamp: 2013-06-19 05:34:31
Document Index: 585576945

Matched Legal Cases: ['art 2', 'art 3', 'art 2', 'art 2', 'art 2', 'art 9', 'art 3', 'art 3']

Brevet US6146383 - Pivotal securing system at a bone screw - Google�BrevetsRecherche Images Maps Play YouTube Actualit�s Gmail Drive Plus » Recherche avanc�e dans les brevets | Historique Web | Connexion Recherche avanc�e dans les brevets BrevetsWith the invention a pivotal securing system between a bone screw (1) with a spherical head part (2) and a reception part (3) is shown. The reception part has a passage bore (4) with a shoulder at its end which encloses the head part (2) at its lower side and which forms an abutment when the head part...http://www.google.fr/patents/US6146383?utm_source=gb-gplus-shareBrevet US6146383 - Pivotal securing system at a bone screw Num�ro de publicationUS6146383 AType de publicationOctroi Num�ro de demande09/241,824 Date de publication14 nov. 2000 Date de d�p�t1 f�vr. 1999 Date de priorit�2 f�vr. 1998Autre r�f�rence de publicationCA2256055A1, CA2256055C, DE59804657D1, EP0933065A1, EP0938872A1, EP0938872B1 Num�ro de publication09241824, 241824, US 6146383 A, US 6146383A, US-A-6146383, US6146383 A, US6146383A InventeursCosimo Donno, Markus Frohlich, Armin Studer Cessionnaire d'origineSulzer Orthopadie AgCitations de brevets (6), R�f�renc� par (83), Classifications (20) Liens externes: USPTO, Cession USPTO, EspacenetPivotal securing system at a bone screwUS 6146383 A R�sum� With the invention a pivotal securing system between a bone screw (1) with a spherical head part (2) and a reception part (3) is shown. The reception part has a passage bore (4) with a shoulder at its end which encloses the head part (2) at its lower side and which forms an abutment when the head part (2) is pressed on by the clamping screw (7) in a settable pivotal position (8). The head part (2) is executed as a separate part (9) which can be screwed together with the bone screw (1) in order to be able to place on the reception part (3) and to connect it to the latter after the implantation of the bone screw (1).
What is claimed is: 1. A securing system between a bone screw having a spherical head part and a reception part which at the end of a passage bore encloses the head part with a shoulder at its lower side and which receives a clamping screw in the passage bore by means of which the head part can be pressed on against the shoulder in a selectable pivotal position, the spherical head part being a separate screw nut which can be screwed together with a threaded extension of the bone screw.
5. The securing system in accordance with claim 4 where each conical surfaces has a half cone angle between 8
6. The securing system in accordance with claim 5 where each conical surface has a half cone angle α≈20
BACKGROUND OF THE INVENTION A bone screw is shown in EP-A-0 614 649 which must be inserted through a reception part prior to being rotated into an implant, which is a hindrance during the rotating in. Precisely in vertebral corrections a plurality of bone screws of this kind, which are screwed into different vertebrae, are connected to one another via connection rods and reception parts. The reception part is designed in the shape of a tower and receives the spherical head of the bone screw within itself. The bone screw is pivotally journalled at a counter-shell with its spherical head and can be fixed to the reception part either directly by a clamping screw or indirectly by a clamping screw via intermediate members such as connection rod and pressure disc.
SUMMARY OF THE INVENTION The object of the invention is to remedy this condition. This object is satisfied in that the spherical head part is designed as a separate part which can be screwed together with the bone screw in order to be able to place on the reception part and to connect it to the latter after the implantation of the bone screw.
The execution of the separate spherical head part as a screw nut which can be screwed together with a screw-like extension of the bone screw extends the field of use of the standard pedicle screws. Since these screw nuts are weakened by slits, they fasten themselves to their counter-threads when being pressed together. The bone screw need therefore not necessarily have an abutment on its screw-like extension for the spherical screw nut. The screw nut can therefore also be adjusted in its height and then fixed to the counter-thread through pressing together. Engagement surfaces in the form of indentations facilitate the height adjustment of the spherical screw nut. The shoulder of the reception part and the pressing surface of the clamping screw are formed as conical surfaces, the half cone angle a of which should lie within certain limits 8 order to achieve a good clamping action and a low space requirement. With the conical surfaces against a spherical surface the force application points are practically at the same location and hardly dependent on manufacturing tolerances even in elastic and slightly plastic deformations. The springing in of the screw nut, which is weakened by slits, can be attuned to these constant force application points. In addition to the friction between the conical surfaces and the spherical surface, an elastic and a plastic deformation in the form of a flattening also take place, which causes material to protrude in the region of the indentations of the spherical surface and likewise acts counter to a rotation. This kind of a connection permits bone screws with and without a collar to be used, height adjustments to be carried out at the screw shaped extension of the bone screw and thread diameters to be used at the actual bone screw which are greater than the inner diameter of the shoulder in the reception part.
BRIEF DESCRIPTION OF THE DRAWINGS In the following the invention will be described with reference to exemplary embodiments. Shown are:
DESCRIPTION OF THE PREFERRED EMBODIMENTS A pivotal securing system between a bone screw 1 comprising a spherical head part 2 and a reception part 3 is shown in the figures. The reception part has a passage bore 4 with a shoulder at its end which encloses the head part 2 at its lower side and which forms an abutment when the head part 2 is pressed on by the clamping screw 7 in a settable pivotal position 8. The head part 2 is executed as a separate part 9 which can be screwed together with the bone screw 1 in order to be able to place on the reception part 3 and to connect it to the latter after the implantation of the bone screw 1.
FIGS. 3, 4 and 15 show a standard pedicle screw 1 with a relatively long screw-shaped extension 11. In FIG. 3 the clamping screw 7 is turned in only slightly and permits deviations 25 of the pivotal position 8 from a central pivotal position which can be on the order of magnitude of plus or minus 15 the support shoulder 5 and the pressing surface 16 of the clamping screw 7 are conical surfaces with a half cone angle 8 The conical pressing surfaces have the advantage that the force application points at the spherical head 10 are preserved if the latter deforms inwardly as a result of an intentional weakening. A half cone angle α≈20 Since the screw-shaped extension 11 of the illustrated pedicle screw 1 is made longer than the height of the spherical head 10, a conical bore is placed in the clamping screw 11 which allows the maximum provided pivoting. The clamping screw 10 is provided with cut-outs on its upper side which permit the placement of a screwing-in tool. In FIG. 4 the clamping screw 7 is fixed on the spherical screw nut 10. As long as the screw nut 10 does not deform inwardly to such an extent that the thread clearance between the screw nut 10 and the screw-shaped extension 11 is cancelled, only the frictional forces which are produced by the tightening of the screw nut 10 on the collar and the thread are responsible for the torque which can be transmitted to the pedicle screw with respect to the screw axis of the reception part 3.
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