ELEMENT WITH A SHANK AND A HOLDING ELEMENT CONNECTED TO IT FOR CONNECTING TO A ROD
3 Assignments
0 Petitions
Accused Products
Abstract
An element with a shank (1) and a holding element (2) connected to it for connecting to a rod (100) is provided, wherein the holding element (2) has a recess (3) having a U-shaped cross-section for receiving the rod (100) with two legs (4, 5) open at one end (6) and an inner thread (7) on the open legs (4, 5) and a locking element (9) with an outer thread (8) which cooperates with the inner thread of the legs, wherein the inner thread (7) of the legs and the outer thread (8) of the locking element are constructed with a flat thread in which the two flanks (7a, 7b; 8a, 8b)) enclose an angle of 90° in each case with the screw axis (S, M). This prevents splaying of the open legs when the locking element is screwed in. The flat thread is easy to produce.
5 Citations
37 Claims
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1-15. -15. (canceled)
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16. A polyaxial bone anchor comprising:
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an anchor element having a shank and a head; a receiving part having a recess in one end having a U-shaped cross-section forming two legs for receiving a rod therebetween, the receiving part comprising an inner thread on each of the two legs; a locking element to lock the rod in the recess of the receiving part; and a pressure element that cooperates with the head to fix an angle position of the head relative to the receiving part when the locking element is tightened; wherein the receiving part and the head of the anchor element are configured to form a polyaxial connection that permits the head to swivel in the receiving part when unlocked and wherein tightening of the locking element fixes the anchor element in an angle position relative to the receiving part wherein the locking element comprises an outer thread having two flanks, the outer thread cooperates with the inner thread of the two legs, one of the two flanks of the outer thread facing the one end of the receiving part, and the other of the two flanks of the outer thread facing away from the one end of the receiving part when the locking element is assembled to the receiving part; wherein the inner thread on each of the two legs comprises two flanks, an upper flank facing the one end of the receiving part and a lower flank facing away from the one end of the receiving part; wherein a cross-section of the outer thread of the locking element is substantially rectangular and when assembled the lower flank of the inner thread matches a shape of the flank of the outer thread facing the one end of the receiving part such that locking a rod between the legs with the locking element avoids splaying of the legs. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 35, 36)
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26. A polyaxial bone anchor comprising:
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an anchor element having a shank and a head; a receiving part having a recess in one end having a U-shaped cross-section forming two legs for receiving a rod therebetween, the receiving part comprising an inner thread on each of the two legs; a two part locking element to lock the rod in the recess of the receiving part, the two part locking element comprising an outer locking element and an inner locking element; and a pressure element that cooperates with the head to fix an angle position of the head relative to the receiving part when the locking element is tightened; wherein the receiving part and the head of the anchor element are configured to form a polyaxial connection that permits the head to swivel in the receiving part when unlocked and wherein tightening of the outer or inner locking element fixes the anchor element in an angle position relative to the receiving part wherein the outer locking element comprises an outer thread having two flanks, the outer thread cooperates with the inner thread of the two legs, one of the two flanks of the outer thread facing the one end of the receiving part, and the other of the two flanks of the outer thread facing away from the one end of the receiving part when the outer locking element is assembled to the receiving part; wherein the inner thread on each of the two legs comprises two flanks, an upper flank facing the one end of the receiving part and a lower flank facing away from the one end of the receiving part; wherein a cross-section of the outer thread of the outer locking element is substantially rectangular and when assembled the lower flank of the inner thread matches a shape of the flank of the outer thread facing the one end of the receiving part such that locking a rod between the legs with the locking element avoids splaying of the legs; wherein the inner locking element has an outer thread that cooperates with an inner thread of the outer locking element to permit movement of the inner locking element into the recess of the receiving part to lock a rod between the two legs. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 37)
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Specification