Dynamic stabilization device for bones or vertebrae
A dynamic stabilization device for bones or vertebrae is provided which includes at least two bone anchoring elements, at least one connection element, connecting the bone anchoring elements. Each bone anchoring element includes a shank portion to be anchored in the bone or in the vertebra and a head portion to be connected with the connection element. The connection element is at least partly elastic and has at least one loop section. The head portion includes a recess with an opening for inserting the loop section. A securing element is provided for securing the loop section in the recess. The connection element is preferably in the form of an endless loop made of an elastomeric material.
1. A dynamic stabilization device for bones or vertebrae comprising:
at least two bone anchoring elements, each bone anchoring element having a shank portion to be anchored in the bone or in the vertebra and a head portion having two legs defining a recess, each leg having a free end;
at least one connection element configured to be received in the recess between the legs of each of the bone anchoring elements for connecting the bone anchoring elements;
wherein the connection element is at least partly elastic and has at least one continuous loop defining an inner open area inside the at least one loop;
wherein the loop permits relative movement of the two bone anchoring elements relative to each other;
wherein each bone anchoring element further comprises a securing element configured to engage the two legs of the bone anchoring element for securing the loop in the recess; and
wherein when the bone anchoring elements are connected with the connection element, only one of the legs of each of the bone anchoring elements is located in the inner open area.
2. The dynamic stabilization device according to claim 1 , wherein the connection element is an endless loop comprising an elastomer material.
3. The dynamic stabilization device according to claim 1 , wherein each leg comprises an inner thread and the securing element is a screw to be screwed into the legs.
4. The dynamic stabilization device according to claim 1 , wherein a pressure element is provided between the securing element and the loop to exert a pressure onto the loop via the action of the securing element.
5. The dynamic stabilization device according to claim 1 , wherein the recess is shaped so as to accommodate a single loop.
6. The dynamic stabilization device according to claim 1 , wherein the recess comprises two adjacent concave surfaces facing the free ends of the legs to accommodate at least two loops.
7. The dynamic stabilization device according to claim 1 , wherein the shank portion and the head portion are rigidly connected.
8. The dynamic stabilization device according to claim 1 , wherein the shank portion and the head portion are pivotably connected.
9. The dynamic stabilization device according to claim 8 , wherein the shank portion has a spherically shaped head which is pivotably held in the head portion.
10. The dynamic stabilization device according to claim 8 , wherein a first pressure element and a second pressure element are provided which encompass the loop in the recess and which are slideable in the recess such that when applying a pressure via the securing element an angular position of the shank is locked.
11. The dynamic stabilization device according to claim 10 , wherein the first pressure element exerts a pressure on the spherically shaped head.
12. The dynamic stabilization device according to claim 1 , wherein the cross-section of the loop is substantially circular.
13. The dynamic stabilization device according to claim 1 , wherein the connection element is connected to two bone anchoring elements in a non-stressed condition.
14. The dynamic stabilization device of claim 1 , wherein the recess is substantially U-shaped.
15. The dynamic stabilization device according to claim 1 , wherein the connection element is a single loop.
16. The dynamic stabilization device according to claim 1 , wherein the connection element is a double loop having two closed loops and a central section therebetween.
17. The dynamic stabilization device according to claim 1 , wherein a part of the head portion deforms the loop to secure the loop in the recess.
18. The dynamic stabilization device of claim 1 , wherein each of the legs of the bone anchoring elements located in the inner open area has an outer wall opposite to an inner wall of the leg, the inner wall having internal threads, wherein the outer walls of the legs face each other.
19. The dynamic stabilization device of claim 1 , wherein a contour of the loop includes two opposing long sides, and two opposing short sides relatively shorter than the long sides, wherein the short sides of the loop are received in the recesses between the legs.
20. A dynamic stabilization device for bones and vertebrae comprising:
at least one connection element comprising an elastic material and including at least one continuous loop defining an inner open area inside the at least one loop; and
at least two bone anchoring elements, each bone anchoring element comprising:
a shank portion configured to be anchored in a bone or in a vertebra;
a head portion having two legs defining a recess including an opening between the legs configured to receive a portion of the loop of the connection element, each leg having a free end;
a pressure element mountable in the recess over the portion of the loop of the connection element;
a securing element configured to engage the two legs to secure the portion of the loop of the connection element in the recess by pressure exerted with the pressure element; and
wherein when the bone anchoring elements are connected with the connection element, only one of the legs of each of the bone anchoring elements is located in the inner open area,
wherein the loop permits relative movement of the two bone anchoring elements relative to each other.
21. The dynamic stabilization device according to claim 20 , wherein the recess and the pressure element include two adjacent concave surfaces facing the free ends of the legs to accommodate at least two loops.
22. The dynamic stabilization device according to claim 20 , wherein the shank portion and the head portion are pivotably connected.
23. The dynamic stabilization device according to claim 22 , further comprising a second pressure element configured to mount under the portion of the loop of the connection element in the recess, wherein securing the securing element further exerts pressure on the second pressure element to lock an angular position of the shank relative to the head portion.
24. The dynamic stabilization device according to claim 20 , wherein the connection element is a double loop having two closed loops and a central section therebetween.
25. A dynamic stabilization device for bones or vertebrae comprising:
a first bone anchoring element comprising a shank portion to be anchored in the bone or in the vertebra and a head portion having two legs defining a recess and a securing element configured to engage the two legs, each leg having a free end;
a second bone anchoring element comprising a shank portion to be anchored in the bone or in the vertebra and a head portion having two legs defining a recess and a securing element configured to engage the two legs, each leg having a free end;
a third bone anchoring element comprising a shank portion to be anchored in the bone or in the vertebra and a head portion having two legs defining a recess and a securing element configured to engage the two legs, each leg having a free end;
a first connection element being at least partly elastic and having at least one continuous loop, the first connection element configured to be received in the recess between the legs of the first bone anchoring element and secured therein with the securing element of the first bone anchoring element, and the first connection element configured to be received in the recess between the legs of the second bone anchoring element and secured therein with the securing element of the second bone anchoring element; and
a second connection element being at least partly elastic and having at least one continuous loop, the second connection element configured to be received in the recess between the legs of the second bone anchoring element and secured therein with the securing element of the second bone anchoring element, and the second connection element configured to be received in the recess between the legs of the third bone anchoring element and secured therein with the securing element of the third bone anchoring element,
wherein the loops permit relative movement of the three bone anchoring elements relative to each other.
26. The dynamic stabilization device according to claim 25 , wherein the first connection element is an endless loop, and wherein the second connection element is an endless loop.
27. The dynamic stabilization device according to claim 25 , wherein the recess of at least the second bone anchoring element comprises two adjacent concave surfaces facing the free ends of the legs to accommodate the first connection element and the second connection element.
28. A dynamic stabilization device for bones or vertebrae comprising:
a bone anchoring element having a head;
a receiving part comprising:
a peripheral wall having a top end and a bottom end;
a bore extending through the top end and the bottom end along a first axis, the bore configured to receive the head at the bottom end;
a first recess through the peripheral wall extending from the top end toward the bottom end, the first recess having two sides and a bottom; and
a second recess through the peripheral wall opposite the first recess in a direction along a second axis, the second axis perpendicular to the first axis and extending through the first recess and the second recess, the second recess extending from the top end toward the bottom end, the second recess having two sides and a bottom;
a pressure element having a bottom side configured to contact the head when the head is received in the bore at the bottom end and a top side opposite the bottom side, the top side having two adjacent concave surfaces separated by a ridge projecting from the top side, the concave surfaces facing the top end of the receiving part when the pressure element is received in the receiving part; and
a securing element configured to connect to the top end of the receiving part and lock the head in the bore of the receiving part.
29. The dynamic stabilization device according to claim 28 , where the concave surfaces extend along the second axis opposite to each other relative to the second axis when the pressure element is received in the receiving part.
30. The dynamic stabilization device according to claim 28 , wherein the bottom of each recess comprises two adjacent concave surfaces facing the top end of the receiving part.
31. The dynamic stabilization device according to claim 28 , further comprising a pair of connection elements, each connection element configured to be received in one of the concave surfaces of the pressure element.
32. The dynamic stabilization device according to claim 31 , wherein at least one of the connection elements is at least partially elastic.
33. The dynamic stabilization device according to claim 31 , wherein each connection element has at least one loop.
34. The dynamic stabilization device according to claim 28 , further comprising a second pressure element between the pressure element and the securing element, the second pressure element having a top side and a bottom side, wherein the bottom side of the second pressure element comprises two adjacent concave surfaces facing the bottom end of the receiving part.
35. The dynamic stabilization device of claim 28 , wherein each concave surface is configured to receive a connection element.