Source: http://www.google.com/patents/US20050203518?dq=6004266
Timestamp: 2014-09-17 21:52:55
Document Index: 274644135

Matched Legal Cases: ['art, 11', 'art 11', 'art 11', 'art, 18', 'art 18', 'art 18', 'art 18', 'art 18', 'art 18', 'art 18', 'art 18', 'art 18', 'arts 18']

Patent US20050203518 - Stabilization device for the dynamic stabilization of vertebrae or bones and ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign in<nobr>Advanced Patent Search</nobr>PatentsA stabilization device for the dynamic stabilization of bones or vertebrae, comprises a first bone anchoring element for anchoring in a first bone part or a first vertebra, a second bone anchoring element for anchoring in a second bone part or a second vertebra, a rod-shaped element for connecting the...http://www.google.com/patents/US20050203518?utm_source=gb-gplus-sharePatent US20050203518 - Stabilization device for the dynamic stabilization of vertebrae or bones and rod like element for such a stabilization deviceAdvanced Patent SearchPublication numberUS20050203518 A1Publication typeApplicationApplication numberUS 11/072,911Publication dateSep 15, 2005Filing dateMar 4, 2005Priority dateMar 5, 2004Also published asDE102004010844A1, DE502005004918D1, DE502005010152D1, EP1570795A1, EP1570795B1, EP1952775A2, EP1952775A3, EP1952775B1, US7601166, US8257400, US20100049254Publication number072911, 11072911, US 2005/0203518 A1, US 2005/203518 A1, US 20050203518 A1, US 20050203518A1, US 2005203518 A1, US 2005203518A1, US-A1-20050203518, US-A1-2005203518, US2005/0203518A1, US2005/203518A1, US20050203518 A1, US20050203518A1, US2005203518 A1, US2005203518A1InventorsLutz Biedermann, Jurgen Harms, Wilfried MatthisOriginal AssigneeBiedermann Motech GmbhExport CitationBiBTeX, EndNote, RefManReferenced by (31), Classifications (21), Legal Events (4) External Links: USPTO, USPTO Assignment, EspacenetStabilization device for the dynamic stabilization of vertebrae or bones and rod like element for such a stabilization deviceUS 20050203518 A1Abstract A stabilization device for the dynamic stabilization of bones or vertebrae, comprises a first bone anchoring element for anchoring in a first bone part or a first vertebra, a second bone anchoring element for anchoring in a second bone part or a second vertebra, a rod-shaped element for connecting the first and the second bone anchoring element, whereby the rod-shaped element comprises a curved section, that undergoes an elastic deformation under the action of a force acting on the rod-shaped element via an anchoring element, and whereby the rod-shaped element and the anchoring elements are arranged so that deformation occurs when a force acts in a main direction of motion of the bone parts or vertebra relative to each other, whereas a deformation is suppressed when a force acts in a direction that is essentially perpendicular to the main direction of motion. Images(10) Claims(19)
DESCRIPTION OF THE DRAWINGS FIG. 1 shows a top view of the stabilization device according to a first embodiment of the invention viewed from the posterior side of the spinal column; FIG. 2 a shows a perspective view of a rod-shaped element of the stabilization device according to FIG. 1; FIG. 2 b shows a perspective view of the stabilization device according to FIG. 1 viewed from above with a preferred implementation of the rod-shaped elements (the upper two bone anchoring elements not shown); FIGS. 2 c and 2 d show a perspective view of modifications of the rod-shaped element to be used in the stabilization device according to FIG. 1; FIG. 3 shows a partial sectional view of an anchoring element for anchoring the rod-shaped element of FIG. 2 according to a first embodiment; FIG. 4 shows a partial sectional exploded view of an anchoring element for anchoring the rod-shaped element of FIG. 2 according to a second embodiment; FIG. 5 shows a partial sectional view of the anchoring element of FIG. 4 connected to a rod-shaped element; FIG. 6 a shows a schematic illustration of the mobility of a rod-shaped element of the stabilization device of FIG. 1; FIG. 6 b shows a schematic illustration of the function of the stabilization device according to the first embodiment; FIG. 6 c shows a modification of the stabilization device according to the first embodiment; FIG. 7 shows a modification of the stabilization device of the first embodiment; FIG. 8 a shows a section of the spinal column viewed from the side in flexion and extension; and FIG. 8 b shows a section of the spinal column viewed from behind, showing lateral translation motion as well as torsional motion around the longitudinal axis of the spinal column. DETAILED DESCRIPTION OF THE DRAWINGS AND PRESENTLY PREFERRED EMBODIMENTS The invention and various embodiments thereof are presented in FIGS. 1 to 7 and the accompanying descriptions wherein like numbered items are identical. As is seen in FIG. 1, the stabilization device comprises a first and a second rod-shaped element, 1, 1′. These two rod-shaped elements are each connected to two bone anchoring elements, which are anchored in the pedicles of two neighboring vertebrae, 4, 5. In this particular example, pedicle screws are used as the bone anchoring elements. The first pedicle screw 2 of rod-shaped element 1 is anchored to the right pedicle of the lower vertebra, 4, whereas the second pedicle screw, 3, of rod-shaped element 1 is anchored to the left pedicle of the upper vertebra, 5. Symmetrical to this arrangement, the first pedicle screw, 2′, of rod-shaped element 1′ is anchored to the left pedicle of the lower vertebra, 4, whereas the second pedicle screw, 3′, of rod-shaped element 1′ is anchored to the right pedicle of the upper vertebra, 5. In this embodiment, the rod-shaped elements, 1, 1′, intersect at a point, K, within the plane of symmetry. The first rod-shaped element, 1, is in the form of a curved rod with a rectangular cross-section as seen in FIG. 2 a. Rod-shaped element 1 comprises a first straight section, 6, of length L1, and, adjacent to it, a curved section, 7, of length L2, and, adjacent to it, another straight section 8 of length L3. The middle longitudinal axes, M1 and M2, of the straight sections intersect and form an obtuse angle, α. In the embodiment shown, the length, L1, of the first straight section, 6 is approximately three times the length, L3, of the second straight section, 8. The rod-shaped element has a broad side, B, and a narrow side, S. The curvature extends over the broad side, B, of the rod-shaped element. The flexural strength due to a force acting perpendicular to the broad side, B, of the rod-shaped element is smaller than the flexural strength due to a force acting perpendicular on its narrow side, S. Moreover, due to the lever effect resulting from the difference in the lengths, L1 and L3, of the straight sections, 6, 8, the flexural strength of the rod-shaped element with respect to a force acting perpendicularly to the rod-shaped element on the long section, 6, is smaller than the flexural strength with respect to a force acting on the end of the short section, 8, in an orthogonal direction. The rod-shaped element thus possesses oriented flexural strength that can be adjusted during the manufacture as desired by selecting the cross-section, curvature, and length of the rod-shaped element to achieve the desired properties. The rod-shaped element 1 can be made from a body-compatible materials, preferably from one piece of such material. The body compatible material comprises stainless steel, titanium alloys, nickel-titanium alloys, nitinol, chrome alloy, cobalt chrome alloys, shape memory alloys, materials with super elastic properties, carbon reinforced composites, silicone, polyurethane, polyester, polyether, polyalkene, polyethylene, polyamide, poly(vinyl) fluoride, polyetheretherketone (PEEK), or polytetrafluoroethylene (PTFE). In its simplest embodiment, the second rod-shaped element, 1′, is attached in mirror-like symmetry to the first rod-shaped element, 1, such that the curved sections face in opposite directions. FIG. 2 b shows the stabilization device of FIG. 1 from above with a preferred implementation of rod-shaped elements, 1, 1′. In this FIG. 2 b, the respective upper bone anchoring elements are not shown. In an area, 1 a, 1 a′, adjacent to the section with which they are anchored in the anchoring element, rod-shaped elements 1, 1′ are curved to extend out of the plane defined by the connection points so that they are guided past each other without interfering with each other in the operational state of the stabilization device. This configuration enables all the connection points of the bone anchoring elements of the rod-shaped elements to reside in a plane that is orthogonal to the median plane indicated in FIG. 8 a. FIG. 2 c shows a modification of the rod-shaped element which can be used in the stabilization device of FIG. 1. The rod-shaped element according to FIG. 2 c differs from the rod-shaped element shown in FIG. 2 a because the cross-section is spherical, instead of rectangular. As is shown in FIG. 2 d, the diameter of the rod-shaped element may vary. For example, it can increase from the free end of the first straight section 6 towards the free end of the second straight section 8. As is shown in FIG. 3, in a first embodiment, the rod-shaped element, 1, 1′, is fixed in a monoaxial pedicle screw. This screw comprises a threaded shaft, 10, with a bone thread and a receiving part, 11, that is rigidly connected thereto. Receiving part 11 is provided to be essentially cylindrically symmetrical in shape and includes a recess, 12, which extends from its free end facing away from threaded shaft 10. The receiving part 11 has a rectangular cross-section that is dimensioned so that rod-shaped element 1, 1′ can be placed therein and still remain capable of shifting in the direction of its longitudinal axis. The narrow side, S, of rod-shaped element 1 rests in the base of the recess 12 of the receiving part. The receiving part also includes an external thread, 13, that extends from its free end and has a pre-determined length which is dimensioned such that, when the rod-shaped element inserted, the external thread extends to below the upper side thereof. A nut, 14, that can be screwed onto the external thread 13 is provided for fixing the rod-shaped element in the receiving part. In a further embodiment, a polyaxial screw is used as the bone anchoring element for connecting to the rod-shaped element, 1, 1′, is as shown in FIGS. 4 and 5. This polyaxial screw comprises a screw element, 15, with a threaded shaft, 16, with a bone thread, and a spherical segment-shaped head, 17, with a recess for screwing-in (not shown). Furthermore, a receiving part, 18, that can be connected to screw element 15 is shown. The screw element 15 pivots relative to the receiving part 18. The receiving part 18 is provided to be essentially cylindrical in shape and comprises at its one end a first bore, 19, that is aligned axially with the screw element 15. The first bore 19 has a diameter that is smaller than that of head 17 of the screw element 15. Receiving part 18 further comprises a coaxial second bore, 20, that is open on its end opposite to first bore 19 and whose diameter is sufficiently large to enable the screw element, 15, to be guided through the open end with its threaded shaft through first bore 19 and with head 17 to the base of second bore 20. A spherically shaped section or a ledge, 21, is provided in the receiving part for abutment of head 17 between the first bore, 19, and the second bore, 20. It will be appreciated by those skilled in the art that any shaped structure can be used provided that it holds the head of the screw element in the bore. The receiving part 18 further comprises a recess 22, which is arranged symmetrically with respect to the middle of the receiving part and has a rectangular cross-section for receiving the rod-shaped element, 1, 1′, and through which two free legs, 23, 24, are formed. In an area on the receiving part 18, adjacent to the free end, legs 23, 24, there may be an external thread, 25, and an internal thread, 26. In addition, the polyaxial screw may include a pressure element, 27, that is capable of pressing onto the head 17 of the screw. Pressure element 27 comprises a coaxial bore, 28, for insertion of a screw driver on one side, and, at its side facing head 17, a spherical recess, 29, for receiving the receiving head 17. At its side facing away from the head, pressure element 27 comprises a recess, 30, with a rectangular cross-section for receiving the rod-shaped element, 1, 1′. The width of recess 30 is just slightly larger than the narrow side, S, of rod-shaped element 1, 1′ such that the rod-shaped element can be introduced with its narrow side, S, towards the base of the recess so that it is capable of shifting in longitudinal direction within the recess. The depth of recess 30 is preferably slightly smaller than height B of the rod-shaped element. Although shown in this manner, it will be appreciated by those skilled in the art that the pressure element can be of other shapes so long as it is capable of pressing onto the head of the screw. Moreover, an internal screw 31 can be screwed onto the legs 23, 24 for fixing rod-shaped element 1, 1′ in the receiving part as well as for fixing the angle position of screw element 15 relative to the receiving part. A nut 32 can be screwed onto the outside of legs 23, 24 to secure the receiving part 18. In operation, the pedicle screws, 2, 3, 2′, 3′, are first screwed into the vertebrae, 4, 5, to be connected by the stabilization device. In the case of the monoaxial screws shown in FIG. 3, the threaded shafts, 10, are screwed in until the receiving parts, 11, of the pedicle screws, 2, 3 or 2′, 3′ to be connected to a rod-shaped element 1, 1′ are aligned with respect to each other such that the rod-shaped element can be introduced without jamming. The rod-shaped element is then inserted into the receiving part and fixed into the receiving part by screwing-on nut 14. In the case of the polyaxial screws, shown in FIGS. 4 and 5, screw element 15 is first inserted into receiving part 18, then followed by the pressure element 27. Then the screw element 15 is screwed into the pedicle as described above. Subsequently, the rod-shaped element 1 or 1′ is inserted into the receiving part. Due to the flexible connection between the head 17 and receiving part 18, the receiving parts 18 of two pedicle screws 2, 3 or 2′, 3′ to be connected by the rod-shaped element, 1 or 1′, align themselves correctly with respect to the rod, which is of advantage in the intersecting arrangement of the rod-shaped elements. Subsequently, the receiving parts are fixed relative to the head and the rod by means of the internal screw and the nut. FIGS. 6 a and 6 b show a schematic illustration of the function of the stabilization device. The rod-shaped element 1 shown in FIG. 6 a with no load can be likened to an angle lever with a long lever arm, 6, and a short lever arm, 8. In the presence of load due to flexion or extension of the spinal column segment, a small force component acting on the anchoring points orthogonal to long lever arm 6 leads to the elastic deformation of rod-shaped element 1, by displacing the long lever arm and increasing or reducing the size of the radius of curvature relative to the resting position upon flexion or extension, respectively. The continuous lines and the dashed lines in FIG. 6 b show rod-shaped elements, 1, 1′, in a first state and in a second state, respectively, with the latter corresponding to a flexion of the spinal column segment. In the first state, pedicle screws 2′, 3, to which rod-shaped element 1 is connected, are at a distance, H, from each other in the direction of the middle longitudinal axis of the spinal column. Flexion of the spinal column segment leads to the bending of rod-shaped element 1, whereby the radius of curvature increases and therefore the distance between the pedicle screws from each other in the direction of the middle longitudinal axis increases to H′. In contrast, an extension of the spinal column segment causes the radius of curvature of the rod-shaped elements to decrease. This causes the distance between the pedicle screws to decrease. (not shown). When a force component acts perpendicularly to the short lever arm, it is more difficult or even impossible for the curvature of the rod-shaped elements to change because a greater force is required. This prevents a lateral translational motion. Due to the elongated implementation of the rod-shaped elements, there is also a high degree of rotational stability with respect to a rotational motion of the vertebrae relative to each other. FIG. 6 c shows a modification of the stabilization device according to FIG. 1. Instead of rigid rod-shaped elements 1, 1′ rod-shaped elements 1″, 1′″ are used which have a spring-like flexible section 6″, 6′″. Preferably the spring-like section 6″, 6′″ is the longer straight section. Flexibility is achieved, e.g. by a helical recess 60 creating helical spring-like windings 61. The rod-shaped element may be hollow. The spring-like section can be achieved with another construction. FIG. 7 shows a second embodiment of the instant invention. The stabilization device of this embodiment comprises to two motion elements, that extend between three vertebrae, 4, 5 and 5′. This embodiment comprises rod-shaped elements, 101, 101′, whose shape is �u-shaped.� That is the rod-shaped element is identical to that generated by mirroring a rod-shaped element, 1, 1′, according to the first embodiment on a plane that stands orthogonal on the free end of the short section. Rod-shaped elements 101, 101′ each are anchored at their ends in the pedicles on the same side of the spinal column by means of pedicle screws 2, 2″ or 2′, 3″, between two vertebra, 4, 5′ which have a intermediate vertebrae 5 between them. The middle sections of the rod-shaped elements 101 and 101′ are also anchored in the pedicles of the intermediate vertebra 5 on the opposite side of the spinal column by means of pedicle screws 3 or 3′. The rod-shaped elements 101 and 101′ can be constructed from a unitary rod or from multi-segments which are joined together to form a unitary rod structure. Modifications of the embodiments described above are also possible. For example, the lengths of the individual sections of the rod-shaped elements can be selected according to the dimensions of the vertebrae to be connected. The invention is not limited to the rod-shaped elements of the stabilization devices of the first embodiment comprising a long and a short straight section. There can also be only one long and one curved section. In the stabilization device according to the second embodiment, the straight sections can differ in length, however in this embodiment it is important that the rod-shaped element is curved between the one attachment point and the other attachment point so that the rod-shaped element effects a change in the distance of the attachment points under the action of flexural moments. Moreover, the features of the various embodiments described above can be combined with each other. The stabilization device according to the first embodiment can also comprise rod-shaped elements with a circular cross-section. A square cross-section shall also be possible, though this reduces one degree of freedom in the selection of the flexural-elastic properties of the rod-shaped element. Instead of the monoaxial screws and polyaxial screws described above, monoaxial screws and polyaxial screws can be used, in which the fixation of the head or the rod occurs by different means. Hooks may also be used for fixation of the rod-shaped element. Although the drawing and descriptions describe the stabilization device for the spinal column, the invention should not be so limited. The instant invention can also be used to stabilize bones. The embodiments described above and shown herein are illustrative and not restrictive. The scope of the invention is indicated by the claims, including all equivalents, rather than by the foregoing description and attached drawings. The invention may be embodied in other specific forms without departing from the spirit and scope of the invention. Referenced byCiting PatentFiling datePublication dateApplicantTitleUS7766941May 14, 2004Aug 3, 2010Paul Kamaljit SSpinal support, stabilizationUS7766942Aug 31, 2006Aug 3, 2010Warsaw Orthopedic, Inc.Polymer rods for spinal applicationsUS7875059Jan 18, 2007Jan 25, 2011Warsaw Orthopedic, Inc.Variable stiffness support membersUS7931676 *Jan 18, 2007Apr 26, 2011Warsaw Orthopedic, Inc.Vertebral stabilizerUS7968037Oct 14, 2008Jun 28, 2011Warsaw Orthopedic, Inc.Polymer rods for spinal applicationsUS8048127May 30, 2007Nov 1, 2011Arthroplastie-DiffusionBone fixing deviceUS8097020Dec 11, 2006Jan 17, 2012Custom Spine, Inc.Pedicle dynamic facet arthroplasty system and methodUS8142480 *Aug 1, 2007Mar 27, 2012Spartek Medical, Inc.Dynamic stabilization and motion preservation spinal implantation system with horizontal deflection rod and articulating vertical rodsUS8147520 *Aug 1, 2007Apr 3, 2012Spartek Medical, Inc.Horizontally loaded dynamic stabilization and motion preservation spinal implantation system and methodUS8182515 *Aug 1, 2007May 22, 2012Spartek Medical, Inc.Dynamic stabilization and motion preservation spinal implantation system and methodUS8192468 *Dec 21, 2006Jun 5, 2012Biedermann Technologies Gmbh & Co. KgDynamic stabilization device for bones or vertebraeUS8353932 *Aug 20, 2008Jan 15, 2013Jackson Roger PPolyaxial bone anchor assembly with one-piece closure, pressure insert and plastic elongate memberUS8414621Aug 12, 2009Apr 9, 2013Biedermann Technologies Gmbh & Co. KgModular system for the stabilization of the spinal columnUS8419773Feb 21, 2008Apr 16, 2013Bierdermann Technologies GmbH & Co. KGStabilization device for stabilizing bones of a vertebra and rod connector used thereforUS8568458Sep 12, 2007Oct 29, 2013Biedermann Technologies Gmbh & Co. KgBone anchoring deviceUS8740944Feb 28, 2007Jun 3, 2014Warsaw Orthopedic, Inc.Vertebral stabilizerUS20060229607 *Mar 16, 2005Oct 12, 2006Sdgi Holdings, Inc.Systems, kits and methods for treatment of the spinal column using elongate support membersUS20080319490 *Aug 20, 2008Dec 25, 2008Jackson Roger PPolyaxial bone anchor assembly with one-piece closure, pressure insert and plastic elongate memberUS20090318969 *Jun 19, 2009Dec 24, 2009Wilfried MatthisBone anchoring assemblyUS20120016417 *Jul 15, 2010Jan 19, 2012Kyphon SarlFlexing links for intervertebral stabilizationUS20120078303 *Sep 27, 2010Mar 29, 2012Mmsn Limited PartnershipMedical apparatus and method for spinal surgeryUS20120123480 *Jul 1, 2010May 17, 2012Stefan FreudigerAnchorage arrangement for a connecting rod for the stabilization of the spineUS20130079824 *Aug 28, 2012Mar 28, 2013Bird Biedermann AgFrictional screw-rod connection having an indirect form-locking portionEP1900334A1Sep 15, 2006Mar 19, 2008BIEDERMANN MOTECH GmbHBone anchoring deviceEP2088966A1 *Sep 4, 2007Aug 19, 2009Custom Spine, Inc.Pedicle dynamic facet arthroplasty system and methodWO2008073543A1 *Sep 4, 2007Jun 19, 2008Custom Spine IncPedicle dynamic facet arthroplasty system and methodWO2008089298A2 *Jan 17, 2008Jul 24, 2008Warsaw Orthopedic IncVertebral stabilizerWO2008153827A1 *May 29, 2008Dec 18, 2008Roger P JacksonDynamic stabilization connecting member with pre-tensioned solid coreWO2009108618A1 *Feb 24, 2009Sep 3, 2009Warsaw Orthopedic, Inc.Multi-axial screw assemblyWO2010120975A2 *Apr 15, 2010Oct 21, 2010Warsaw Orthopedic, Inc.Integrated feedback for in-situ surgical device contouringWO2011006267A1 *Jul 1, 2010Jan 20, 2011Spinesave AgAnchorage arrangement for a connecting rod for the stabilization of the spine* Cited by examinerClassifications U.S. Classification606/254, 606/266, 606/282, 606/261, 606/279, 606/257, 606/328, 606/278International ClassificationA61B17/70, A61B17/64, A61F2/44, A61B17/58Cooperative ClassificationA61B17/7037, A61B17/701, A61B17/7011, A61B2017/7073, A61B17/7032, A61B17/7026European ClassificationA61B17/70B1R10, A61B17/70B1E, A61B17/70B1GLegal EventsDateCodeEventDescriptionMar 12, 2013FPAYFee paymentYear of fee payment: 4Mar 16, 2012ASAssignmentEffective date: 20120308Owner name: BIEDERMANN TECHNOLOGIES GMBH & CO. KG, GERMANYFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:BIEDERMANN MOTECH GMBH & CO. KG;REEL/FRAME:027873/0551Jan 26, 2012ASAssignmentOwner name: BIEDERMANN MOTECH GMBH & CO. KG, GERMANYFree format text: CHANGE OF LEGAL FORM;ASSIGNOR:BIEDERMANN MOTECH GMBH;REEL/FRAME:027603/0504Effective date: 20090720May 11, 2005ASAssignmentOwner name: BIEDERMANN MOTECH GMBH, GERMANYFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BIEDERMANN, LUTZ;HARMS, J�RGEN;MATTHIS, WILFRIED;REEL/FRAME:015999/0545;SIGNING DATES FROM 20050420 TO 20050427RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google