SELF-LOCKING SCREWDRIVER

• US 20170333093A1
• Filed: 05/11/2017
• Published: 11/23/2017
• Est. Priority Date: 05/18/2016
• Status: Active Grant

• Current Assignee: Clariance
• Original Assignee: Clariance
• Inventors: KRIER, Brice, PONTOIS, Yannick
• Granted Patent: US 10,575,881 B2
• Time in Patent Office: Days
• CPC Class Codes: A61B 17/7082 for driving, i.e. rotating, screws or screw parts specially adapted for spinal fixation, e.g. for driving polyaxial or tulip-headed screws driving other bone screws A61B17/8875
• CPC Class Codes: A61B 2090/035 preventing further rotation

Abstract

The self-locking screwdriver includes a guide tube inside which a clamping rod is guided and rotatably driven, one end of which is provided with a cavity which allows the rotational drive and tightening of an anchoring screw, ensuring the immobilization of an orthopedic implant against an osseous body of an individual, the screwdriver including, on the one hand, between The guide tube and the clamping rod, a blocking system cooperating with the guide tube in order to prevent the latter from being loosened from the orthopedic implant when the anchoring screw is tightened and, on the other hand, on the outer periphery of the guide tube, a gripping wheel for locking and/or unlocking the blocking system and the rotational drive of the guide tube.

Claims

1. A self-locking screwdriver (1) comprising a guide tube (3) inside which a clamping rod (4) which is guided and rotatably driven, one end of which is provided with a cavity (5) enabling the rotational drive and tightening of an anchoring screw (6) ensuring the immobilization of an orthopedic implant (2) against an osseous body of an individual, the self-locking screwdriver comprising, between the guide tube (3) and the clamping rod (4), a blocking system (9, 10 and 11) cooperating with the said guide tube (3) in order to prevent the latter from getting loose from the orthopedic implant (2) when the anchoring screw (6) is being tightened and, on the outer periphery of the guide tube (3), a gripping wheel (8) for locking and/or unlocking the blocking system and the rotational drive of said guide tube (3).

2. The self-locking screwdriver according to claim 1, wherein the blocking system consists of a connecting rod (9) comprising on its periphery a series of teeth (10) cooperating, as a function of the directional rotation of the said rod (9), with a retractable stop (11) arranged in the guide tube (3).

3. The self-locking screwdriver according to claim 2, wherein the retractable stop (11) has a C-shaped profile having an inclined profile (11b) inside the opening (11a).

4. The self-locking screwdriver according to claim 2, wherein the retractable stop (11) comprises a flexible blade (11b) provided with a tooth (11c) on its inner face directed inside said guide tube (3).

5. The self-locking screwdriver according to claim 4, wherein the tooth (11c) has an arcuate profile which is arranged in the extension of the circular profile of the internal bore (3b) of the guide tube (3).

6. The self-locking screwdriver according to claim 2, wherein the connecting rod (9) comprises in the extension of the teeth (10) a connection device (17) consisting of a blind internal bore (17a) and of an elastically deformable blade arrangement (17b) for receiving and blocking the clamping rod (4) in translation and in rotation.

7. The self-locking screwdriver according to claim 2, the guide tube (3) has a torque transmission stud (12) opposite the retractable stop (11).

8. The self-locking screwdriver according to claim 1, wherein the gripping wheel (8) comprises a first space (8a) inside which the retractable stop (11) cooperates and a second space (8b) arranged opposite to the first space (8a) and inside which the torque transmission stud (12) is housed.

9. The self-locking screwdriver according to claim 8, wherein a cam (15), the external profile of which comes into contact with the inclined profile (11d) of the opening (11a) of the retractable stop (11), is provided inside the first space (8a).

10. The self-locking screwdriver according to claim 8, wherein the second space (8b) has an internal profile that allows delimiting, in the vicinity of the external bore of the guide tube (3), a first stop (13) called the “

screwing stop” and

, on the opposite side, a second stop (14) called the “

unscrewing stop”

on which the stud (12) bears as a function of the directional rotation of the gripping wheel (8) around said guide tube.

11. The self-locking screwdriver according to claim 2, wherein the gripping wheel (8) comprises a first space (8a) inside which the retractable stop (11) cooperates and a second space (8b) arranged opposite to the first space (8a) and inside which the torque transmission stud (12) is housed.

12. The self-locking screwdriver according to claim 3, wherein the gripping wheel (8) comprises a first space (8a) inside which the retractable stop (11) cooperates and a second space (8b) arranged opposite to the first space (8a) and inside which the torque transmission stud (12) is housed.

13. The self-locking screwdriver according to claim 4, wherein the gripping wheel (8) comprises a first space (8a) inside which the retractable stop (11) cooperates and a second space (8b) arranged opposite to the first space (8a) and inside which the torque transmission stud (12) is housed.

14. The self-locking screwdriver according to claim 5, wherein the gripping wheel (8) comprises a first space (8a) inside which the retractable stop (11) cooperates and a second space (8b) arranged opposite to the first space (8a) and inside which the torque transmission stud (12) is housed.

15. The self-locking screwdriver according to claim 6, wherein the gripping wheel (8) comprises a first space (8a) inside which the retractable stop (11) cooperates and a second space (8b) arranged opposite to the first space (8a) and inside which the torque transmission stud (12) is housed.

16. The self-locking screwdriver according to claim 7, wherein the gripping wheel (8) comprises a first space (8a) inside which the retractable stop (11) cooperates and a second space (8b) arranged opposite to the first space (8a) and inside which the torque transmission stud (12) is housed.