Source: http://www.google.com/patents/US20070161996?dq=6377161
Timestamp: 2014-08-23 10:40:10
Document Index: 349639698

Matched Legal Cases: ['art 1', 'art 1', 'art 1', 'art 1', 'art 1', 'art 1', 'art 1', 'art 1', 'art 1', 'art 1', 'art 1', 'art 1', 'art 1', 'art 1', 'art 1', 'art 1', 'art 1', 'art 1']

Patent US20070161996 - Bone anchoring device - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign in<nobr>Advanced Patent Search</nobr>PatentsA bone anchoring device includes a receiving part for receiving a rod, the receiving part has a first bore coaxial with a longitudinal axis and a second bore, and an anchoring element having a first end for insertion into the bone and a second end positionable within a second bore, the anchoring element...http://www.google.com/patents/US20070161996?utm_source=gb-gplus-sharePatent US20070161996 - Bone anchoring deviceAdvanced Patent SearchPublication numberUS20070161996 A1Publication typeApplicationApplication numberUS 11/548,856Publication dateJul 12, 2007Filing dateOct 12, 2006Priority dateOct 12, 2005Also published asCN1965769A, CN1965769B, DE602005009202D1, EP1774919A1, EP1774919B1, US7749258, US8048133, US8506611, US20100318135, US20120109224, US20140058463Publication number11548856, 548856, US 2007/0161996 A1, US 2007/161996 A1, US 20070161996 A1, US 20070161996A1, US 2007161996 A1, US 2007161996A1, US-A1-20070161996, US-A1-2007161996, US2007/0161996A1, US2007/161996A1, US20070161996 A1, US20070161996A1, US2007161996 A1, US2007161996A1InventorsLutz Biedermann, Wilfried MatthisOriginal AssigneeLutz Biedermann, Wilfried MatthisExport CitationBiBTeX, EndNote, RefManReferenced by (16), Classifications (9), Legal Events (3) External Links: USPTO, USPTO Assignment, EspacenetBone anchoring deviceUS 20070161996 A1Abstract A bone anchoring device includes a receiving part for receiving a rod, the receiving part has a first bore coaxial with a longitudinal axis and a second bore, and an anchoring element having a first end for insertion into the bone and a second end positionable within a second bore, the anchoring element being movable relative to the receiving part in limited angular range about the longitudinal axis, the angles lying in a single plane. The bone anchoring device further includes a fixation element cooperating with the receiving part to lock the anchoring element relative to the receiving part. The anchoring element is pivotable relative to the receiving part around one rotational axis transverse to the longitudinal axis. Images(8) Claims(20)
DETAILED DESCRIPTION As shown in FIGS. 1 and 2, the bone anchoring device includes a receiving part 1 which is substantially cylindrical and has a first end 2 and a second end 3 opposite to the first end. The two ends extend perpendicular to a longitudinal axis 4. Coaxially with the longitudinal axis 4, a bore 5 is provided which extends from the first end 2 to a predetermined distance from the second end 3. At the second end 3 an opening 6 is provided the diameter of which is smaller than the diameter of the bore 5. The coaxial bore 5 tapers towards the opening 6 in a section 7 which can be for example spherically or conically shaped. The receiving part 1 further has a U-shaped recess 8 which starts from the first end 2 and extends in the direction of the second end 3 to a predetermined distance from said second end 3. By means of the U-shaped recess 8 two free legs 9, 10 are formed extending towards the first end 2. Adjacent to the first end 2, the receiving part 1 comprises an internal thread 11 on said legs 9, 10. The U-shaped recess 8 serves for receiving a rod 12 by means of which several bone anchoring devices are to be connected. The bone anchoring device further includes a bone anchoring element 13 comprising a shank 14 with a bone thread and a head 15 at one end. As shown in FIGS. 3 to 6, the head 15 has two sections 16 a, 16 b which are located opposite to each other and which have a spherical outer surface with the center M of the sphere lying in the center of the head 15. Between the two opposite spherical surfaces 16 a, 16 b the head 15 comprises two cylindrically-shaped surfaces 17 a, 17 b with the cylinder axis C being perpendicular to the longitudinal axis L of the bone anchoring element 13 and extending through the center M of the head. On the side opposite to the threaded section 14, the head 15 comprises a flat surface 18. A recess 19 for engagement with screwing-in tool is provided in the flat surface 18. The cylinder radius of the cylindrically-shaped surfaces 17 a and 17 b is smaller than the radius of the spherical surfaces 16 a, 16 b. The diameter of the threaded section 14 is smaller than the diameter of the opening 6 of the receiving part so that the anchoring element 13 can be inserted from the first end 2 in the receiving part 1, the threaded section 14 being guided through the lower opening 6 until the spherical surfaces 16 a, 16 b come into contact with the tapering section 7 of the receiving part 1. As can be seen from FIGS. 1 and 7 to 15, the bone anchoring device further comprises a pressure element 20 for acting onto the head 15 and to limit a pivoting movement of the head 15 in the receiving part 1. The pressure element 20 is substantially cylindrically shaped and comprises a first end 21 and a second end 22. The outer diameter of the pressure element 20 is slightly smaller than the inner diameter of the bore 5 of the receiving part 1 so that the pressure element 20 can be inserted into the receiving part 1 and can slide within the bore 5. Adjacent to the first end 21 the pressure element 20 includes a cylindrical segment-shaped recess 23 the size of which is such that the rod 12 fits to the recess 23. Adjacent to the second end 22 the pressure element 20 includes a second cylindrical segment-shaped recess 24 the cylinder axis of which is perpendicular to the cylinder axis of the first cylindrical segment-shaped recess 23. The radius of the cylinder segment of the second cylindrical segment-shaped recess 24 corresponds essentially to the radius of the cylindrically-shaped surfaces 17 a, 17 b of the head 15. The width W of the second cylindrical segment-shaped recess 24 corresponds to the width of the cylindrical surfaces 17 a, 17 b of the head 15 such that the cylindrical segment-shaped recess 24 covers at least partly the surfaces 17 a, 17 b when the anchoring element 13 and the pressure element are inserted in the receiving part 1. The pressure element 20 further includes adjacent to the second end 22 two opposite spherical recesses 25 a, 25 b extending on both sides of the second cylindrical segment-shaped recess 24 and having a diameter which is, for example, equal or larger than the diameter of the opposing spherical surfaces 16 a, 16 b of the head 15 so that, as can be seen in FIGS. 14 a, 14 b and 15 the spherical surfaces 16 a, 16 b of the head 15 are not covered by the pressure element 20. In addition, the pressure element 20 comprises crimp bores 26 on its outer surface which are located preferably opposite to each other at the sides having the recesses 25 a, 25 b and which engage with corresponding crimp bores 27 on the legs in the receiving part 1, respectively. The crimp bores 26, 27 serve for a loose pre-assembly of the pressure element 20 within the receiving part so that the pressure element 20 cannot fall out. In this way also the pivoting plane of the anchoring element relative to the receiving part is pre-defined. The pressure element may be secured against rotation in another manner, for example by means of pins or otherwise. Furthermore, the pressure element 20 has a coaxial bore 28 for allowing access for a screwing-in tool to the recess 19 in the head 15. In FIGS. 12 and 13 a modified embodiment of the pressure element is shown. The pressure element 20′ differs from the pressure element shown in FIGS. 7 to 11 in that the second cylindrical recess 24′ is aligned with respect to the first cylindrical recess 23 in such a way that the cylinder axes are parallel. As a result thereof, the axis of rotation for the pivoting motion of the anchoring element is rotated by 90� compared to the case in which the pressure element shown in FIGS. 7 to 11 is used. As shown in FIGS. 1 and 2 the bone anchoring device also includes an inner screw 30 that can be screwed between the legs 9, 10 to fix the rod 12 and to exert a pressure onto the head 15 via the rod 12. The whole bone anchoring device can be made of a biocompatible material, for example titanium. In use, first, the anchoring element 13 is inserted into the receiving part 1 by guiding the threaded shaft 14 through the opening 6 at the second end 3 of the receiving part until the head 15 rests against the section 7 adjacent to the opening 6. Then, the pressure element 20 is inserted into the receiving part 1 with its second end 22 facing the head and is held loosely by the cooperating crimp bores 26, 27 in a position in which the recess 23 of the pressure element is coaxial with the recess 8 of the receiving part 1. The cylindrical surfaces 17 a, 17 b of the head 15 are covered at least partly with the cylindrical surface of the recess 24 of the pressure element. In this manner pre-assembled, the anchoring element 13 is screwed into the bone. In this state the anchoring element 13 is still pivotable with respect to the receiving part 1, however, the angular range of pivoting is limited and lies within a plane P which contains the longitudinal axis 4 of the receiving part and forms the plane of mirror symmetry of the receiving part 1. In the embodiment, the plane P is the sectional plane of the section shown in FIG. 2. Pivoting in a single plane is accomplished by the pressure element 20 acting onto the head 15 without exerting pressure onto the head 15 only by the cooperation of the surfaces 17 a, 17 b with the second cylindrical segment-shaped recess 24 which allows a pivoting motion around the cylinder axis C but prevents pivoting in another direction. Therefore, an adjustment of the position of the receiving part with respect to the anchoring element 13 in the sagittal plane, i.e., along the rod 12 when the device is in use, is possible, whereas an adjustment in a lateral direction, i.e., transverse to the rod 12 when the device is in use, is blocked. After adjustment of the position of the receiving part 1 the rod 12 is inserted and an inner screw 30 is screwed-in between the legs 9, 10 and tightened to exert a pressure onto the rod which itself exerts a pressure onto the pressure element 20. The pressure element 20 then exerts a pressure onto the head 15 to lock it in its final position. Hence, the rotation of the anchoring element 13 around the longitudinal axis 4 is prevented by the form-fit cooperation of the cylindrical surfaces of the head 15 and the pressure element whereas the locking of the angular motion of the head in the single plane is achieved by frictional forces acting between the head 15 and the pressure element 20. In FIG. 16 two bone anchoring devices 50, 50′ are shown which are connected by a rod 12. The first bone anchoring device 1 comprises the pressure element 20 shown in FIGS. 7 to 11. The axis of rotation of the anchoring element 13 is perpendicular to the rod axis A which allows an adjustment in a plane defined by the longitudinal axis 4 of the receiving part 1 and the rod axis A. The second bone anchoring element 50′ comprises a pressure element 20′ as shown in FIGS. 12 and 13. The axis of rotation of the bone anchoring element 13 is parallel to the rod axis A which allows an adjustment of the anchoring element 13 in a single plane which is perpendicular to the rod axis A and includes the longitudinal axis 4 of the receiving part. The alternative embodiments of pressure elements 20,20′ as shown in FIG. 16 may simultaneously be employed with regard to the two bone anchoring devices 50, 50′ connected by the same rod 12. In accordance with one embodiment of the present disclosure, each bone anchoring device 50,50′ can be associated with two pressure elements 20,20′ so as to provide interchangeable use of the pressure elements 20,20′. Referring to FIG. 16, the bone anchoring device 50 with the pressure element 20 enables a rotation of the anchoring element 13 in a sagittal plane. When the pressure element 20′ is used with the bone anchoring device 50, however, a rotation of the anchoring element 13 in a transversal plane is enabled. Similarly, the bone anchoring device 50′ with the pressure element 20′ enables a rotation of the anchoring element 13 in a transversal plane. When the pressure element 20 is used with the bone anchoring device 50′, however, a rotation of the bone anchoring element 13 in a sagittal plane is enabled. Accordingly, the interchangeable use of the pressure elements 20,20′ with each bone anchoring device 50 or 50′ can provide a surgeon with the ability to select any one of the sagittal and transversal planes of motion for any anchoring device 50 or 50′. One of ordinary skill in the art will appreciate that a number of additional interchangeable pressure elements can be provided so that each additional pressure element enables a plane of rotation other than sagittal or transversal planes as described above. Thus, with the ability to interchangeably use the pressure elements 20, 20′ and/or any additional pressure elements enabling different planes of rotation for the anchoring element 13, a surgeon has the freedom to choose a pressure element depending on the requirements of each situation. As can be seen from FIGS. 14 a, 14 b, 15 and 16 the bone anchoring device according to the disclosure allows an adjustment in a single plane or, in other words, a rotation around one rotational axis. Therefore, the anchoring element is connected to the receiving part in a monoplanar manner. The bone anchoring device is more stable than a polyaxial bone anchoring device which allows a pivoting in a range of 360� around the longitudinal axis. It has an improved resistance to loads and allows a positional adjustment of the receiving part which is sufficient for specific clinical applications. By selecting the appropriate pressure element it is possible to assemble a bone anchoring device which can be adjusted in a desired plane relative to the rod according to the actual anatomical requirements. The bone anchoring device is not limited to the embodiments discussed above. Modifications are conceivable. Any orientation of the two cylinder axes of the first and the second cylindrical recesses of the pressure element with respect to each other is possible. The cylinder segment-shaped recess 23 of the pressure element can be omitted. That means, the first end 21 of the pressure element can have a flat surface. In this case, the pressure element can be oriented within the receiving part such that the second cylinder segment-shaped recess is aligned in any desired direction. The surfaces 16 a, 16 b of the head 15 do not need to have a spherical shape. They can also be flat. The single plane in which the anchoring element can be pivoted must not include the longitudinal axis. It can also extend in parallel to the longitudinal axis. The receiving part can have an asymmetric edge at the opening 6 to enable a larger pivot angle on one side of the longitudinal axis that on the other side. The asymmetry in the pivot angle can be achieved also by other means. In the embodiment shown the pressure is exerted via the rod 12 onto the pressure element 20 which itself presses onto the head. It is, however, possible to separate the locking of the head 15 via the pressure element 20 from the locking of the rod 12. For this purpose, the recess 23 in the pressure element 20 comprises upwardly extending legs extending above the inserted rod 12 so that it is possible to press separately onto these legs via separate inner screw encompassing the inner screw 30 which presses onto the rod. In a further modification, a construction is possible in which the head is inserted into the receiving part 1 from the second end 3. In this case the opening 6 must be large enough to introduce the head and means must be provided to prevent falling-out of the head. In another modification the lower opening 6 of the receiving part is provided with a thread which cooperates with the thread of the shaft 14 of the anchoring element. In this case the threaded shaft 14 of the anchoring element 13 can be screwed-in the opening and further into the bone. The diameter of the threaded shaft can be as large as the diameter of the first bore 5. Instead of the threaded shaft 14 any other bone anchoring means is conceivable, such as nails or hooks. The bone anchoring device needs not to be pre-assembled before use in surgery. It can also be assembled during surgery. Referenced byCiting PatentFiling datePublication dateApplicantTitleUS8038701 *Oct 22, 2007Oct 18, 2011K2M, Inc.Uni-planar, taper lock bone screwUS8167912 *Aug 3, 2007May 1, 2012The Center for Orthopedic Research and Education, IncModular pedicle screw systemUS8419778 *Jan 15, 2010Apr 16, 2013Ebi, LlcUniplanar bone anchor systemUS8636783 *Aug 5, 2008Jan 28, 2014Zimmer Spine, Inc.Spinal stabilization systems and methodsUS8647370Jul 23, 2010Feb 11, 2014Ebi, LlcUniplanar bone anchor systemUS8709051Apr 1, 2010Apr 29, 2014Blackstone Medical, Inc.Multi-axial connection systemUS20080288002 *Aug 5, 2008Nov 20, 2008Abbott Spine Inc.Spinal Stabilization Systems and MethodsUS20110178558 *Jan 15, 2010Jul 21, 2011Ebi, LlcUniplanar bone anchor systemUS20110196430 *Feb 10, 2010Aug 11, 2011Walsh David ASpinal fixation assembly with intermediate elementUS20120165882 *Dec 27, 2011Jun 28, 2012Lutz BiedermannPolyaxial bone anchoring deviceUS20130066376 *Sep 14, 2012Mar 14, 2013Biedermann Technologies Gmbh & Co. KgPolyaxial bone anchoring deviceWO2009055503A1 *Oct 22, 2008Apr 30, 2009Michael BarrusUni-planar, taper lock bone screwWO2009124196A2 *Apr 2, 2009Oct 8, 2009Life Spine, Inc.Top loading polyaxial spine screw assembly with one step lockupWO2010011196A1 *Jul 25, 2008Jan 28, 2010Hays Saglik Urunleri Ic Ve Dis Ticaret Limited SirketiPosterior dynamic screwWO2011053795A2 *Oct 29, 2010May 5, 2011Warsaw Orthopedic, Inc.Bone engaging implant with adjustment saddleWO2011100309A1 *Feb 9, 2011Aug 18, 2011Ingenium S.A.Spinal fixation assembly with intermediate element* Cited by examinerClassifications U.S. Classification606/305International ClassificationA61F2/30Cooperative ClassificationA61B17/8605, A61B17/7004, A61B17/7032, A61B17/7038, A61B17/7037European ClassificationA61B17/70B5D, A61B17/70B5BLegal EventsDateCodeEventDescriptionJan 2, 2014FPAYFee paymentYear of fee payment: 4Mar 16, 2012ASAssignmentOwner name: BIEDERMANN TECHNOLOGIES GMBH & CO. KG, GERMANYEffective date: 20120308Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:BIEDERMANN MOTECH GMBH & CO. KG;REEL/FRAME:027873/0551Jan 26, 2012ASAssignmentOwner name: BIEDERMANN MOTECH GMBH & CO. KG, GERMANYEffective date: 20090720Free format text: CHANGE OF LEGAL FORM;ASSIGNOR:BIEDERMANN MOTECH GMBH;REEL/FRAME:027603/0504RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google