Element with a shank and a holding element connected to it for connecting to a rod

• US 20030100896A1
• Filed: 11/27/2002
• Published: 05/29/2003
• Est. Priority Date: 11/27/2001
• Status: Active Grant

• Current Assignee: Biedermann Technologies GmbH & Co. KG
• Original Assignee: Biedermann Technologies GmbH & Co. KG
• Inventors: Biedermann, Lutz, Harms, Jurgen
• Granted Patent: US 8,828,060 B2
• Time in Patent Office: Days
• US Class Current: 606/61
• CPC Class Codes: A61B 17/7032 Screws or hooks with U-shaped head or back through which longitudinal rods pass
• CPC Class Codes: A61B 17/7035 Screws or hooks, wherein a rod-clamping part and a bone-anchoring part can pivot relative to each other
• CPC Class Codes: A61B 17/7037 wherein pivoting is blocked when the rod is clamped
• CPC Class Codes: A61B 17/7049 Connectors, not bearing on the vertebrae, for linking longitudinal elements together A61B17/7055, A61B17/7053, A61B17/7019 take precedence
• CPC Class Codes: F16B 33/02 Shape of thread; Special thread-forms F16B25/00 takes precedence; used to remove paint or dirt layers F16B35/007, F16B37/002; used as screw-locking device F16B39/30
• CPC Class Codes: F16B 35/06 Specially-shaped heads special shape in order to rotate the bolt F16B23/00 ; separate hook adaptors for bolts F16B43/025
• CPC Class Codes: F16B 37/125 the external surface of the insert being threaded
• CPC Class Codes: F16B 43/02 with special provisions for engaging surfaces which are not perpendicular to a bolt axis or do not surround the bolt
• CPC Class Codes: F16B 7/18 using screw-thread elements F16B7/025 takes precedence; for turnbuckles F16B7/06

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.

Claims

1. Element with a shank (1) and a holding element (2;

21;

21′

) connected to it for connecting to a rod (100), wherein the holding element (2;

21;

21′

) comprises a recess having a U-shaped cross-section for receiving the rod with two legs (4, 5;

26, 27) open at one end (6;

28) and an inner thread (7;

29) on the open legs and a locking element (9;

34;

50;

50′

) with an outer thread (8;

35;

51) which cooperates with the inner thread of the legs, characterised in that the two flanks (7a, 7b) of the inner thread (7;

29) enclose an angle of 90°

, respectively, with the central axis (M) of the holding element.

2. Element according to claim 1, characterised in that the thread cross-section is substantially constructed as rectangular.

3. Element according to claim 1 or 2, characterised in that the locking element (9;

34;

50;

50′

) cooperating with the inner thread (7;

29) comprises a matching outer thread (8;

35;

51).

4. Element according to one of claims 1 to 3, characterised in that with unloaded bringing into engagement of the locking element (9;

34;

50;

50′

) and the open legs (4, 5;

26, 27) of the holding element (2;

21;

21′

) a gap is provided between the flanks (7b) of the holding element facing away from the open end and the flanks (8a) of the locking element facing the open end.

5. Element according to one of claims 1 to 4, characterised in that the root (7c) of the inner thread of the open legs is formed, respectively, as rounded.

6. Element according to one of claims 1 to 5, characterised in that the holding element (2) is formed monoaxially to the shank (1).

7. Element according to one of claims 1 to 6, characterised in that the locking element (50;

50′

) is constructed as a nut with an inner thread (52) and an inner screw (60) is provided for screwing into the locking element.

8. Element according to claim 7, characterised in that the inner thread (52) of the locking element (50;

50′

) and the outer thread (61) of the inner screw (60) are formed as metric threads.

9. Element according to one of claims 1 to 8, characterised in that the element has a head (20), which is connected to the shank (1) and polyaxially connected to the holding element (21;

21′

), and a pressure element (30;

40) acting on the head (20) is provided for fixing the angle position of the head relative to the holding element.

10. Element according to claim 9, characterised in that the pressure element (40) comprises on its side facing away from the head (20) a recess (45) open to the open end (28) for receiving the rod (100), the depth of which, seen in the axial direction, is larger than the diameter of the rod (100).

11. Element according to one of claims 1 to 10, characterised in that the locking element (50;

50′

) comprises on one of its ends a projection (54) in the radial direction, which acts as stop when the locking element is screwed in between the open legs (26, 27).

12. Element according to claim 11, characterised in that the projection (54) comprises on its open end a section (55) which cooperates with a corresponding section (56) on the outer side of the holding element (21′

) and overlaps it like a cap.

13. Element according to one of claims 1 to 12, characterised in that a section adjacent to the open end of the shank is formed with a bone thread for screwing into the bone or as a hook.

14. Element according to one of claims 1 to 13, characterised in that the two flanks (7a, 7b) of the inner thread are constructed without undercuts or steps.

15. Element with a shank (1) and a holding element (2;

21;

21′

) connected to it for connecting to a rod (100), wherein the holding element (2;

21;

21′

) comprises a recess having a U-shaped cross-section for receiving the rod with two legs (4, 5;

26, 27) open at one end (6;

28) and an inner thread (7;

29) on the open legs and a locking element (9;

34;

50;

50′

) with an outer thread (8;

35;

51) which cooperates with the inner thread of the legs, characterised in that the two flanks (7a, 7b) of the inner thread (7;

29) enclose an angle of 90°

, respectively, with the central axis (M) of the holding element and wherein the two flanks (7a, 7b) of the inner thread are formed without undercuts or steps.