Source: https://patents.google.com/patent/EP1923011B1/en
Timestamp: 2019-04-22 03:35:43
Document Index: 48283571

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

EP1923011B1 - Bone anchoring device - Google Patents
EP1923011B1
EP1923011B1 EP06023910A EP06023910A EP1923011B1 EP 1923011 B1 EP1923011 B1 EP 1923011B1 EP 06023910 A EP06023910 A EP 06023910A EP 06023910 A EP06023910 A EP 06023910A EP 1923011 B1 EP1923011 B1 EP 1923011B1
EP06023910A
EP1923011A1 (en
2006-11-17 Application filed by Biedermann Motech GmbH and Co KG filed Critical Biedermann Motech GmbH and Co KG
2006-11-17 Priority to EP06023910A priority Critical patent/EP1923011B1/en
2008-05-21 Publication of EP1923011A1 publication Critical patent/EP1923011A1/en
2009-10-07 Publication of EP1923011B1 publication Critical patent/EP1923011B1/en
Document WO 2006/084493 A1 shows a spinal fixing device having a screw head defining a receiving part. The receiving part has a bore into which can be inserted a bone screw, which has a nearly spherical head. This spherical is provided with two opposite planar surfaces, which engage with respective planar surfaces formed inside the bore of the receiving part to yield an uniaxial rotation of the bone screw with respect to the receiving part or vice versa.
Document US 2006/0200131 A1 proposes a bone screw assembly including a rod receiving portion and a compression member for locking an anchor portion. Additional protrusions are provided to the compression member, which engage with two opposite planar surfaces respectively formed in the head of the anchor portion in order to limit movement of the same to a rotation about just one axis.
It is an object to provide such a bone anchoring device, which simplifies handling of an anchoring device and increases its stability against external forces once the device has been fixated using a fixation element.
The object is solved by a bone anchoring device comprising the combination of features according to appended claim 1. Advantageous aspects and embodiments are evident from the dependent claims.
The present bone anchoring device is arranged to reduce rotation of the anchoring element to rotation around one single axis prior to fixation. For this purpose, a locking device is provided at an inner wall of the receiving part which engages with the surface of the head of the anchoring element in order to impede rotation around, e.g., a longitudinal axis of the receiving part. The locking device and the engaging surface are constructed such as to allow pivotal motion around one single axis, which in this example may be oriented perpendicular to the longitudinal axis.
shows a perspective exploded view of a bone anchoring device according to an embodiment prior to assembly;
shows a perspective exploded view of the bone anchoring device according to Fig. 1, but after assembly (rod and fixation element still to be attached);
shows a partly sectional view of the bone anchoring device according to the assembled state of Fig. 2, with a sectional plane defined by the longitudinal axis and the pivotal axis;
shows a perspective view of an anchoring element;
shows a top view onto a head of the anchoring element shown in Fig. 4;
shows a side view of the anchoring element shown in Fig. 4 with the flat guiding surface portions seen in profile;
same as Fig. 6a, but with flat guiding surface portions oriented towards observer (90 degrees rotated);
Figs. 7a-c
show an alternative embodiment of a head with flat guiding surfaces being inclined with respect to an axis of the shank of the anchoring element;
shows the arrangement of through holes in a cross-sectional profile through a horizontal plane labelled as 42 in Fig. 3, the plane containing the rotational axis;
shows an alternative embodiment of an arrangement of through holes;
Figs. 10a, b
show alternative embodiments of pins;
Figs. 11a, b
show an embodiment wherein the through holes are arranged in a longitudinal direction with respect to the receiving part;
Figs. 12a, b
show an embodiment wherein only one through hole is formed in the receiving part, (a) shows an exploded view, whereas (b) indicates a cross sectional profile in a horizontal plane with respect to the receiving part.
Figs. 1 to 3 show in a perspective view a first embodiment of a bone anchoring device, wherein Fig.1 reveals a situation prior to assembly, Fig. 2 shows details after assembly, and Fig. 3 shows a partly cross sectional profile of the embodiment illustrated in Figs. 1 and 2 without rod and fixation element.
As shown in more detail in Figs. 4 to 6, the head 15 has a spherical surface portion 16 with the center M (not shown) of a respective sphere 37 lying in the center of the head 15. The head 15 further has two substantially flat surface portions 35a, 35b recessed from an ideal sphere as defined by spherical surface portion 16. The flat surface portions are positioned on opposite sides of the head 15 and are oriented parallel to each other.
A pressure element 20 is provided for acting onto the head 15. 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 comprises 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 spherically shaped inner surface. The radius of the sphere corresponds to that of the head 15. The pressure element 20 further has a coaxial bore 28 for allowing access for a screwing-in tool to the recess 19 in the head 15. The pressure element 20 can further be secured against falling apart from the receiving part 1 once it has been inserted, or against rotation within the receiving part 1, for example by means of crimp bores 27 or means exerting a similar function. However, the bone anchoring device is not limited thereto.
It becomes clear to the person skilled in the art, that any direction of the through holes 34 as formed in the receiving part 1 may be constructed according the specific needs. Fig. 9 shows another embodiment, wherein multiple through holes 34a, 34b are formed perpendicular to and cross each other. The pin may be inserted either into through hole 34a, or alternatively into through hole 34b. Only one through hole 34a, b per direction is shown. Using the bone anchoring device according to this embodiment, the surgeon may in-situ decide which rotational axis is presently preferred to achieve stability.
According to a further embodiment illustrated in Figs. 7a-c, the orientation of the surface normal 41 of the flat guiding surfaces 35c, 35d is inclined with respect to a plane defined by the top surface 18 of the anchoring element 13. As a result inclined angles α of the threaded shafts 14 with respect to the longitudinal axis 4 of the receiving part 1 may be accomplished. A set of anchoring elements with different inclination angles α = 0°, 5°, 10°, 15°, etc., respectively, may be supplied for example, from which the surgeon may choose according to the situation. It is noted that the rotation axis 46 is retained in this embodiment.
According to one embodiment pins may be inserted into through holes formed in the receiving part from externally such that the pins cross the spherical portion being used as a bearing for the head of the anchoring element and the pins engage with the recessed surface of the head. Accordingly, the surgeon may fix the degree of rotation depending on the situation. Without the pins, the anchoring element can be pivoted in any direction.
The pins 33 may be inserted into through-holes 34, which are oriented within a horizontal plane with regard to the receiving part 1 as shown, e.g., in Fig. 1. However, the invention is not restricted to that specific embodiment. An alternate embodiment shown in Fig. 11 indicates that the through holes 34 may equivalently be arranged in a longitudinal direction with respect to the receiving part 1. The pins 33 are then inserted into the through holes 34 from a bottom side of the receiving part. Other directions of the through holes 34 than horizontal or longitudinal are possible as well.
A bone anchoring device, comprising:
a receiving part (1) for receiving a rod, the receiving part (1) having a first bore (5) coaxial with a longitudinal axis (4) and a second bore (6), the receiving part (1) comprising a through hole (34);
an anchoring element (13) having a first end (14) for insertion into the bone and a second end (15) positionable within the second bore (6), the second end (15) comprising a surface having a spherically shaped portion (36) and a portion (35a-d) recessed from the spherically shaped surface portion (36) ;
at least one pin (33) that can be provided to the second bore (6) of the receiving part (1) by insertion into the through hole (34), such that the pin (33) protrudes from an inner surface (7) of the second bore (6) and engages with the portion (35a-d) recessed from the spherically shaped surface portion (36) of the second end (15) of the anchoring element (13), such that the anchoring element (13) is pivotable relative to the receiving part (1) around a single axis (46) of rotation.
The bone anchoring device according to claim 1, wherein the through hole (34) extends from a first opening formed in an outer surface of the receiving part (1) towards a second opening formed in the inner surface (7) of the second bore (6), such that the pin (33) protrudes out of the second opening in the inner surface (7) of the second bore (6).
The bone anchoring device according to claim 2, wherein the through hole (34) is arranged such that upon insertion the pin (33) tangentially engages with the recessed surface portion (35) of the second end (15) of the anchoring element (13).
The bone anchoring device according to one of claims 1 to 3 wherein two pins (33a, 33b) are provided for insertion into respective through holes (34) formed in the receiving part (1).
The bone anchoring device according to claim 1, wherein the locking device (33) is integrally formed with the receiving part (1).
The bone anchoring device according to one of claims 1 to 5, wherein the locking device (33) is arranged such that the single axis (46) of rotation is perpendicular relative to the longitudinal axis (4) of the receiving part (1).
The bone anchoring device according to one of claims 1 to 6, further comprising a pressure element (20), which is arranged between the second end (15) of the anchoring element (13) and the fixation element (30) for transmitting pressure to the second end (15) in order to lock the angular position of the anchoring element (13) by means of frictional force.
The bone anchoring device according to one of claims 1 to 7, wherein the recessed surface portion (35) of the second end (15) of the anchoring element (13) is substantially flat.
The bone anchoring device according to one of claims 1 to 8, wherein a fixation element (30) cooperates with the receiving part (1) to lock the anchoring element (13) relative to the receiving part (1).
EP06023910A 2006-11-17 2006-11-17 Bone anchoring device Expired - Fee Related EP1923011B1 (en)
EP06023910A EP1923011B1 (en) 2006-11-17 2006-11-17 Bone anchoring device
ES06023910T ES2334811T3 (en) 2006-11-17 2006-11-17 Bone anchoring device.
DE602006009682T DE602006009682D1 (en) 2006-11-17 2006-11-17 Bone anchoring device
US11/934,625 US7892259B2 (en) 2006-11-17 2007-11-02 Bone anchoring device
TW096142773A TWI418329B (en) 2006-11-17 2007-11-13 Bone anchoring device
JP2007294439A JP5209275B2 (en) 2006-11-17 2007-11-13 Bone fixation device
KR20070115512A KR101488946B1 (en) 2006-11-17 2007-11-13 Bone Anchoring Device
CN2007101700951A CN101181166B (en) 2006-11-17 2007-11-13 Bone anchoring device
US13/005,285 US8998965B2 (en) 2006-11-17 2011-01-12 Bone anchoring device
US14/635,559 US20150272630A1 (en) 2006-11-17 2015-03-02 Bone anchoring device
EP1923011A1 EP1923011A1 (en) 2008-05-21
EP1923011B1 true EP1923011B1 (en) 2009-10-07
EP06023910A Expired - Fee Related EP1923011B1 (en) 2006-11-17 2006-11-17 Bone anchoring device
TW (1) TWI418329B (en)
2006-11-17 DE DE602006009682T patent/DE602006009682D1/en active Active
2006-11-17 EP EP06023910A patent/EP1923011B1/en not_active Expired - Fee Related
2006-11-17 ES ES06023910T patent/ES2334811T3/en active Active
2007-11-02 US US11/934,625 patent/US7892259B2/en not_active Expired - Fee Related
2007-11-13 JP JP2007294439A patent/JP5209275B2/en not_active Expired - Fee Related
2007-11-13 KR KR20070115512A patent/KR101488946B1/en not_active IP Right Cessation
2007-11-13 CN CN2007101700951A patent/CN101181166B/en not_active IP Right Cessation
2007-11-13 TW TW096142773A patent/TWI418329B/en not_active IP Right Cessation
2011-01-12 US US13/005,285 patent/US8998965B2/en active Active
2015-03-02 US US14/635,559 patent/US20150272630A1/en not_active Abandoned
US20110112585A1 (en) 2011-05-12
US20150272630A1 (en) 2015-10-01
ES2334811T3 (en) 2010-03-16
TW200822902A (en) 2008-06-01
US7892259B2 (en) 2011-02-22
TWI418329B (en) 2013-12-11
CN101181166A (en) 2008-05-21
EP1923011A1 (en) 2008-05-21
DE602006009682D1 (en) 2009-11-19
JP5209275B2 (en) 2013-06-12
JP2008126066A (en) 2008-06-05
KR20080045054A (en) 2008-05-22
CN101181166B (en) 2011-04-27
US8998965B2 (en) 2015-04-07
KR101488946B1 (en) 2015-02-06
US20080147129A1 (en) 2008-06-19
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