Source: https://patents.google.com/patent/EP2311396B1/en
Timestamp: 2018-08-15 00:18:21
Document Index: 703879940

Matched Legal Cases: ['art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 801', 'art 5', 'art 5']

EP2311396B1 - Bone anchoring device - Google Patents
EP2311396B1
EP2311396B1 EP20100196877 EP10196877A EP2311396B1 EP 2311396 B1 EP2311396 B1 EP 2311396B1 EP 20100196877 EP20100196877 EP 20100196877 EP 10196877 A EP10196877 A EP 10196877A EP 2311396 B1 EP2311396 B1 EP 2311396B1
EP20100196877
EP2311396A1 (en )
WO 2007/038350 A2 discloses an apparatus for connecting a bone anchor to a support rod, comprising a connector body having a top opening, two opposed arms and a channel to receive and locate the support rod relative to the bone anchor, the channel communicating with the top opening; and a cap to secure the support rod in the channel, the cap having at least one radial projection and being configured to move axially into the top opening of the connector body into a partially installed position covering the top opening, and configured to rotate to an installed position without moving axially relative the connector body, whereby the at least one projection contacts and deflects at least one arm outward to enlarge the top opening as the cap rotates toward the installed position.
Further features and advantages of the invention will become apparent from the description of embodiments using the accompanying drawings. Only the embodiment of figures 16 and 17 with the projections 23 falls within the scope of the claims.
shows a further embodiment, partially in section.
shows a perspective view from above onto the locking ring of the embodiment according to Fig. 19.
shows a sectional view of the locking ring of Fig. 20 along line A-A.
As can be seen in particular in Figs. 6 to 10, a plurality of slits 19 are provided which are open to the free end 17 and extend from the free end 17 to the second end 9b of the first portion and continue in the slits 15 of the first portion thereby forming a continuous slit extending from the free end 17 of the second portion into the first portion. The number of slits 19 may be equal to the number of the slits 15, however, it can be smaller or larger depending on the desired elasticity of the second portion 16. In addition, slits 20 are provided on the side of the second portion 16 which is adjacent to the U-shaped recess 12 of the first portion. The slits 20 end at a distance of the second end 9b. The elasticity of the second portion 16 is such that the head 3 of the anchoring element can be inserted by expanding the second portion and can be clamped by compressing the second portion. The slits 15 in the first portion facilitate mounting of the receiving part onto the head 3 manually, for example at any time before or during surgery. The dimension of the head 3 and the elasticity of the second portion is designed such that when the head is introduced into the second portion it is temporarily held in a preliminary angular holding position due to frictional forces. This preliminary holding position can be selected by rotating the receiving part against the head. It prevents an uncontrolled movement of the receiving part once the bone screw is implanted and the receiving part is put onto the head.
The second embodiment differs from the first embodiment only with respect to the bone anchoring element and the accommodation space in the second portion 16 of the receiving part. The bone anchoring element 1' has a threaded shaft 2 and a cylindrical head 30. As can be seen in particular in Figs. 12 and 13, the accommodation space of the second portion 16 of the receiving part 5 has a hollow cylindrical inner space 181 the diameter of which is slightly larger than the diameter of the cylindrical head 30 in such a way that the cylindrical head 30 can be inserted and guided in the cylindrical, section 181 in the unlocked state. The end of the cylindrical section forms a stop 182 for the head 30. The use of the bone anchoring device according to the second embodiment is similar to that of the first embodiment. The difference is that the receiving part 5 cannot pivot relative to the bone anchoring element 1' but can only rotate in the unclamped state of the head 30. Such a monoaxial rotatable connection between the receiving part 5 and the bone anchoring element 1' may be useful in certain anatomical situations. It allows the receiving part to be aligned with respect to the rod by only rotating it around the screw axis.
Figs. 16 and 17 show a modification of the locking ring and the only one embodiment of the figures falling within the scope of the claims. The receiving part 5 is identical to one of the previously described receiving parts and the description thereof will not be repeated. The locking ring 8' has on either side of each projection 21 a lateral projection 23 resulting in a diameter of the projection 21 which is larger than the diameter of the cuts 24 on the basis of recess 12. When the locking ring 8' is mounted, the projections 23 snap into the recess 12 due to the elasticity of the receiving part 5. The projections 23 form a securing means against falling off of the locking ring 8' when the head 3 is not yet inserted. This may be useful when the surgeon handles the parts before the receiving part 5 is clicked onto the screw.
Fig. 19 to 21 show a further embodiment which differs from the embodiment according to Fig. 1 in the design of the locking ring 800. The receiving part 5 is identical to one of the previously described receiving parts and the description thereof will not be repeated. The locking ring 800 has a lower part 801 which is designed like the locking ring 8 of, for example, Fig. 11 to 13 and includes two projections 21 which are offset by 180°. Furthermore, the locking ring 800 comprises an annular edge 802 the inner diameter of which is larger than the outer diameter of the first portion 9 of the receiving part 5. The height of the annular edge 802 can be as large as the height of the projection 21. However, the annular edge 802 can have a height larger than the projection 21. The thickness of the annular edge 802 is small, so that the overall diameter of the receiving part 5 is not substantially increased.
As can be seen in Fig. 19, the annular edge 802 has such a height that when the locking ring 800 is in its lower most position clamping the head of the screw 1 the annular edge 802 closes the gap between the main portion 801 of the locking ring and the lower side of the first portion 9 of the receiving part. Therefore, there is not risk of in-growth tissue or vessels into this place.
a bone anchoring element (1,1') having a shaft (2) for anchoring in the bone and a head (3, 3'); a receiving part (5) for coupling a rod (6) to the bone anchoring element, wherein the receiving part comprises
wherein the locking ring (8) is mounted to the receiving part from the free end (17) of the second portion (16),
cuts (24) are provided in the first portion (9) on ether end of the channel formed by the recess (12);
in that the locking ring (8) comprises two projections (21) offset by 180° which project into the U-shaped recess (12) when the head is not clamped and
in that on either side of each projection (21) a lateral projection (23) is provided resulting in a diameter of the projection (21) which is larger than the diameter of the cuts (24) on the basis of the recess (12) such that when the locking ring (8) is mounted, the lateral projections (23) snap into the recess (12) due to the elasticity of the receiving part (5) and form a securing means against falling off of the locking ring (8) when the head (3) is not yet inserted.
The bone anchoring device according to claim 1, wherein the diameter of the second portion (16) of the receiving part (5) adjacent to the second cnd is smaller than the diameter of the first portion (9) at the second end (9b).
The bone anchoring device according to one of claims 1 to 12, wherein a plane going through the free end (17) of the second portion (16) includes an angle with the first end (9a).
The bone anchoring device according to one of claims 1 to 14, wherein the locking ring (800) has an annular edge extending in the same direction as the projections, the height of which is sized such that the edge encompasses (802) a portion of the first portion of the receiving part when the head is clamped by the locking ring.
EP20100196877 2007-07-31 2008-07-31 Bone anchoring device Active EP2311396B1 (en)
EP08013775.5 Division 2008-07-31
EP2311396A1 true EP2311396A1 (en) 2011-04-20
EP2311396B1 true EP2311396B1 (en) 2013-06-05
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