Source: http://www.google.com/patents/US20040049190?dq=6335678
Timestamp: 2016-05-05 03:06:56
Document Index: 234365018

Matched Legal Cases: ['art 6', 'art 6', 'art 6', 'art 6', 'art 6', 'art 6', 'art 6', 'art 6', 'art 6', 'arts 6', 'arts 6', 'arts 6', 'arts 6', 'arts 6', 'art 6', 'arts 6', 'arts 6', 'art 6', 'art 6']

Patent US20040049190 - Dynamic stabilization device for bones, in particular for vertebrae - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA dynamic stabilization device for bones, in particular vertebrae, is made with two bone anchoring elements and a rigid rod with a longitudinal axis connecting them. An elastic element is inserted between the two bone anchoring elements. It acts on the bone anchoring elements to exert a force in a direction...http://www.google.com/patents/US20040049190?utm_source=gb-gplus-sharePatent US20040049190 - Dynamic stabilization device for bones, in particular for vertebraeAdvanced Patent SearchPublication numberUS20040049190 A1Publication typeApplicationApplication numberUS 10/637,349Publication dateMar 11, 2004Filing dateAug 7, 2003Priority dateAug 9, 2002Also published asDE10236691A1, DE10236691B4, DE50306246D1, EP1388323A1, EP1388323B1, US7722649, US20100204736Publication number10637349, 637349, US 2004/0049190 A1, US 2004/049190 A1, US 20040049190 A1, US 20040049190A1, US 2004049190 A1, US 2004049190A1, US-A1-20040049190, US-A1-2004049190, US2004/0049190A1, US2004/049190A1, US20040049190 A1, US20040049190A1, US2004049190 A1, US2004049190A1InventorsLutz Biedermann, Dezso JeszenskyOriginal AssigneeBiedermann Motech GmbhExport CitationBiBTeX, EndNote, RefManPatent Citations (13), Referenced by (566), Classifications (18), Legal Events (4) External Links: USPTO, USPTO Assignment, EspacenetDynamic stabilization device for bones, in particular for vertebrae
DETAILED DESCRIPTION OF THE INVENTION INCLUDING PREFERRED EMBODIMENTS [0025] The invention is now described in detail with reference to the embodiment illustrated in FIGS. 1 to 4. A stabilization device in accord with one embodiment of the present invention has two polyaxial pedicle screws 1, 2 and a rod 3 connecting them for stabilizing two adjacent vertebrae 100, 101. The stabilization device further contains a spring element 30, provided between the two pedicle screws. [0026] The pedicle screws 1, 2 preferably are constructed as illustrated in FIGS. 3 and 4. A pedicle screw 1, 2 has a screw element with a threaded shank 4 with a bone thread and a head 5 shaped like a segment of a sphere, which is connected to a receiving part 6. The receiving part 6 has on one of its ends a first bore 7, aligned symmetrically to the axis, the diameter of which is larger than that of the threaded section of the shank 4 and smaller than that of the head 5. It further has a coaxial second bore 8 which is open at the end opposite the first bore 7 and the diameter of which is large enough for the screw element to be guided through the open end with its threaded section through the first bore 7 and with its head 5 as far as the floor of the second bore. The floor of the receiving part is constructed in such a way that the screw element in the inserted and unstressed state is swivellable in the receiving part 6. The receiving part further has a U-shaped recess 61 shown in FIG. 4 which is arranged symmetrical towards the center and the floor of which is directed towards the first bore 7 and by which two open legs 10, 11 are formed. In an area bordering on the open end the legs 10, 11 have an inner thread 12. [0027] The pedicle screw additionally contains a pressure element 13, which is constructed with a suitable outer diameter in such a way that it can be pushed into the receiving part 6. On one of its ends a recess 14 is provided, shaped like a segment of a sphere and widening towards the first bore 7 of the receiving part 6, and the spherical radius of which is chosen in such a way that in a state inserted into the receiving part it surrounds the head 5 of the screw element. In the direction of the open end of the legs 10, 11 the pressure element 13 has a U-shaped recess 15, the dimensions of which are so dimensioned that the rod 3 can be placed into the thereby formed channel. The depth of the U-shaped recess 15, seen in the direction of the cylindrical axis of the receiving part 6, is greater than the diameter of the rod 3 to be received, so the pressure element 13 projects upwards with lateral legs 16 above the placed in rod 3. The pressure element 13 further has a central bore 17 which extends through it to permit a screw tool to engage a corresponding recess 18 provided in the head 5. [0028] For fixing the screw element in the receiving part a bushing-type or nut-type locking element 20 is provided which can be screwed in between the legs 10, 11 and which has an outer thread 21 which cooperates with the inner thread 12 of the legs and further has an inner thread 22. For screwing in, the locking element 20 further has radially running indents 23 on one of its ends. The dimensions of the locking element 20 in the axial direction of the receiving part and the dimensions of the open legs 10, 11 of the receiving part and the dimensions of the cooperating threads or the height of the open legs 16 of the pressure element are dimensioned in such a way that in the screwed in state the locking element 20 exerts a force on the legs 16 of the pressure element, so it blocks the head 5 in the receiving part 6. Thus, the angle of the cylindrical axis of the receiving part relative to the longitudinal axis of the screw element can fixed variably [0029] Furthermore, an inner screw or clamping or setting screw 25, which can be screwed into the locking element 20 is provided, the outer thread 26 of which cooperates with the inner thread 22 of the locking element 20. The dimensions of the inner screw 25, the locking element 20 and the pressure element 13 are chosen in such a way that in the screwed in state the inner screw 25 presses on the placed in rod 3. [0030] [0030]FIG. 4 shows a section through the pedicle screw 1 according to FIGS. 1 and 2. Pedicle screw 1 differs from pedicle screw 2 in the construction of the inner screw. As can be seen from FIG. 4, the inner screw 25′ of the pedicle screw 1 has on its side facing the rod a sliding floor 26 made of a sliding material in order to enable low-friction sliding of the rod in operation. A high molecular weight polyethylene of the UHM WPE type with a molecular weight between 2�106 to 10�106 is used, for example, as sliding material. Other biocompatible materials having low coefficient of friction can also be used. Such materials are well known to those skilled in the art. [0031] The spring element 30 preferably is constructed as a helical spring with a diameter which is slightly larger than the diameter of the rod 3, so the helical spring can be pushed on to the rod 3. The length of the helical spring in the axial direction is matched to the size of the distance between the adjacent vertebrae to be bridged by the rod between the two pedicle screws. Furthermore, the length of the helical spring and the spring force can be selected by the surgeon and are dimensioned in such a way that an extension or compression effect can be achieved with the spring for an existing functional deficit of the intervertebral disc. The spring is preferably coated with an abrasion-proof material, e.g. with an abrasion-proof synthetic material [0032] The rod 3 preferably has a stop 31 on one of its ends, e.g. in the form of a ring-shaped shoulder, which has a diameter which is larger than the diameter of the U-shaped recess of the receiving part 6 and the pressure element 13 so that, in the assembled state, the pedicle screw 1 adjacent to the stop 31 is displaceable along the rod only as far as the stop. [0033] Preferably, the rod is coated with a material, in particular, with a suitable material having a low coefficient of friction, which facilitates sliding of the rod in the receiving part 6 or in the pressure element 13 provided for this. Preferably, the pressure element 15 of at least one of the pedicle screws also is coated with a material having a low coefficient of friction which increases the ability to slide, e.g. a synthetic materialSuitable materials include, for example, UHM WPE or anodized metal, such as anodized titanium. [0034] In operation, as can be seen from FIG. 5, first the screw elements of the pedicle screws 1, 2, which have been inserted into the receiving parts 6, are screwed by the surgeon into the vertebrae of a patient adjacent to a defective intervertebral disc 200 in the unstressed state and the receiving parts 6 are aligned in such a way that the rod 3 can be inserted into the U-shaped recesses in the receiving parts 6. The pressure elements 13 can be pre-assembled into the receiving parts and access to the screw head through bore 17 to insert the screws into the vertebrae. Alternatively, the pressure elements can be inserted after the screws have been inserted into the vertebrae. Next, as shown in FIG. 6, the rod 3 is inserted into the receiving parts 6 with the spring 30 assembled on to it. The rod 3 preferably is oriented therein in such a way that the stop 31 points in the direction of the patient's head. Further, the spring 30 is pre-compressed by means of a tool, in order to bring it between the two receiving parts 6 at a bias. [0035] In the next step, illustrated in FIG. 7, the surgeon sets the optimum angle of screw element to receiving part or rod for each of the pedicle screws 1, 2. This angle is then fixed by screwing the locking elements 20 into the receiving parts. As can be seen from FIGS. 3 and 4, fixing of the angle takes place in that the locking element 20 exerts a force on the pressure element 13 in such a way that it fixes the head 5 in its position in the receiving part such that the angle between the longitudinal axis of the screw and the cylindrical axis of the receiving head is fixed as desired by the surgeon. Because the legs 16 of the pressure element project beyond the placed in rod 3, the rod 3 is not touched by screwing in the locking element 20 and is still freely displaceable in the receiving part 6 in each case. [0036] By means of the angle of the screw element and the receiving part to one another a desired wedge angle can be set between the opposite surfaces of the adjacent vertebrae, which enables the intervertebral disc located in between to adopt its natural shape again. By using two stabilization devices in each case, as shown in FIG. 2, the setting of the angle is therein possible in lateral and front view independently of one another. In this way the position of the intervertebral joints to one another also can be defined. [0037] As can be seen further from FIG. 7, the spring 30 inserted under bias expands after insertion and, thus, presses apart the two receiving parts 6 connected by the rod. The expansion is limited on one side by the stop 31. The expansion pressure of the spring causes a widening out of the intervertebral space and the intervertebral joints to take place, whereby the intervertebral disc 200 can expand owing to absorbing fluid from the intervertebral space and the intervertebral joints are freed from stress, as depicted by the arrows in FIG. 7. A damaged intervertebral disc can thus adopt its natural shape again. [0038] As shown in FIG. 8, the spring then is compressed slightly by moving the receiving parts 6 towards one another in order to bring it under bias again. Thereby, the intervertebral space is also reduced and the intervertebral disc is pressed together or shortened slightly again and the intervertebral joints are stressed, as illustrated by the arrows in FIG. 8. In the desired final position, the rod 3 is rigidly connected to the receiving part 6 of the pedicle screw positioned at the end of the rod 3 opposite the stop 31. Fixing the rod takes place by screwing in the inner screw 25 in the receiving part of the lower pedicle screw 2. However, in the pedicle screw 1 provided adjacent to the stop 31 of the rod the receiving part 6 and the rod 3 remain movable (i.e., longitudinally displaceable) with respect to one another. The inner screw 25′ with the sliding floor 26 enables low-friction sliding of the rod. [0039] In the position shown in FIGS. 1 and 2, the dynamic stabilization system in accord with the invention acts as a force transmission and damping system. The forces acting on the vertebral column when the patient is in an upright position are partially transmitted via the system consisting of pedicle screws, spring and rod, so that the stress on the intervertebral disc is lowered. The spring further acts both as an extension element for widening out the intervertebral space in the resting or unstressed state, i.e., while lying down, and as a damper for damping jolts during stresses, such as when walking, for example. [0040] The system has the advantage that optimum adjustment of the bone screws and the rod is possible during assembly. Owing to the rigid connection via the rod, it is possible to transmit axial forces and thus relieve the stress on the intervertebral disc. The system is, however, rigid to bending and torsion, comprising a further advantage in respect of precise force transmission on to the intervertebral disc. [0041] The invention is not limited to the connection of only two polyaxial pedicle screws by a rod. If required, several vertebrae can also be connected to one another, wherein a corresponding number of polyaxial bone screws are placed in each vertebrae being connected. Depending on the desired mobility, a stop is provided at a suitable point on the rod and a corresponding adjacent bone screw held in a manner displaceable relative to the rod. [0042] Although polyaxial bone screws are used in the embodiment example described, the invention is not limited to these. If the anatomy of the corresponding section on the vertebral column allows monoaxial bone screws to be used, the invention also can be used to connect one monoaxial bone screw rigidly to the rod and one monaxial bone screw slideably to the rod. Combinations of monaxial bone screws and polyaxial bone screws also can be used. [0043] The invention has been described in detail with reference to the preferred embodiments. However, those skilled in the art, upon consideration of the disclosure and drawings, may make modifications and improvements within the intended scope of the invention as defined by the claims. For example, the spring element 30 can also be constructed differently. The spring element 30 can be constructed as a helical spring, provided inside the rod. 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KG, GERMANYFree format text: CHANGE OF LEGAL FORM;ASSIGNOR:BIEDERMANN MOTECH GMBH;REEL/FRAME:027603/0504Effective date: 20090720Mar 16, 2012ASAssignmentOwner name: BIEDERMANN TECHNOLOGIES GMBH & CO. KG, GERMANYFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:BIEDERMANN MOTECH GMBH & CO. KG;REEL/FRAME:027873/0551Effective date: 20120308Nov 19, 2013FPAYFee paymentYear of fee payment: 4RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services