Clamping device

• US 20060195104A1
• Filed: 02/08/2006
• Published: 08/31/2006
• Est. Priority Date: 08/08/2003
• Status: Active Grant

• Current Assignee: Synthes USA LLC (Johnson & Johnson)
• Original Assignee: Synthes USA LLC (Johnson & Johnson)
• Inventors: Schlafli, Christoph, Gicquel, Philippe, Niederberger, Alfred
• Granted Patent: US 8,267,974 B2
• Time in Patent Office: Days
• US Class Current: 606/291
• CPC Class Codes: A61B 17/60 for external osteosynthesis, e.g. distractors, contractors
• CPC Class Codes: A61B 17/8047 wherein the additional element surrounds the screw head in the plate hole A61B17/8052 takes precedence
• CPC Class Codes: A61B 17/863 with thread interrupted or changing its form along shank, other than constant taper
• CPC Class Codes: A61B 17/864 hollow, e.g. with socket or cannulated
• CPC Class Codes: A61B 2017/8675 clamping effect due to tapering, e.g. conical thread
• CPC Class Codes: F16B 2/065 using screw-thread elements F16B2/08 - F16B2/12 take precedence
• CPC Class Codes: F16B 9/026 using screw-thread elements
• CPC Class Codes: F16B 9/054 the intermediate member being threaded
• CPC Class Codes: F16B 9/056 the intermediate member extending through the flat surface; the rod or tubular part extending through the flat surface

Abstract

A device for clamping a fixation element which may allow for repositioning of the fixation element. The device may include a body comprising a front end, a rear end, an outer surface, a through bore extending between the front end and the rear end, a structure enabling deformation of at least a portion of the body, and a thread along at least a portion of the outer surface. The body may be tapered and the through bore may be sized and configured to receive a fixation element. The clamping device may also comprise a receiving member having a tapered bore with an inner thread sized and configured to receive the thread of the body. Insertion of the body into the tapered bore of the receiving member may result in at least a portion of the body being deformed. As the body is inserted into the tapered bore, the dimension of the through bore may decrease so that the body firmly engages the fixation element. Such a construction may allow for the body to be loosened from the tapered bore, the fixation element, body or receiving member to be repositioned, and the body re-tightened into the tapered bore.

Claims

1. A clamping device comprising:

a body comprising a front end, a rear end, a through bore extending between the front end and the rear end forming an inner surface, the through bore sized and configured to receive a fixation element, an outer surface extending from the rear end to the front end, the outer surface having a tapered shape having a larger width at the rear end, at least one slot extending from the outer surface to the inner surface, a thread along at least a portion of the tapered outer surface, and an insertion means positioned within the body for inserting the body into a receiving member.

2. The device of claim 1, wherein the receiving member is selected from at least one of the group consisting of a clamping ring and a bone plate.

3. The device of claim 2, wherein the receiving member comprises a tapered bore which is sized and configured to receive the body, the tapered bore having an internal thread.

4. The device of claim 3, wherein the front end of the body deforms upon insertion into the tapered bore.

5. The device of claim 1, wherein the inner surface is selected from at least one of the group consisting of a textured surface, a roughened surface and a knurled surface.

6. The device of claim 1, wherein the at least one slot has a length which is between about 2.5 mm and about 4.5 mm.

7. The device of claim 1, wherein the body has a height extending from the front end to the rear end and the at least one slot has a length, wherein L<

0.8 H.

8. The device of claim 1, wherein the body has a plurality of slots, wherein the slots are spaced equidistant from each other.

9. The device of claim 1, wherein the at least one slot extends from the front end towards the rear end

10. The device of claim 1, wherein the thread has two starts.

11. The device of claim 1, wherein the fixation element is a Kirschner wire.

12. The device of claim 1, wherein the insertion means is a recess portion in the rear end of the body.

13. A clamping device comprising:

a body comprising a circumference, a front end, a rear end, an outer surface, a through bore extending between the front end and the rear end and forming an inner surface, the through bore sized and configured to receive a fixation element, a deformation enabling structure, a thread along at least a portion of the outer surface, a front opening in the front end in communication with the through bore and a rear opening in the rear end in communication with the through bore, wherein the circumference of the outer surface of the body at the rear end is larger than the circumference of the outer surface of the body at the front end;

a receiving member having a bore sized and configured to receive the outer surface of the body, the bore having at least a portion that is both conically shaped and has an inner thread; and

a recess portion within the rear end of the body for receiving a tool for inserting the body into the receiving member.

14. The device of claim 13, wherein the deformation enabling structure comprises a plurality of slots extending from the front end towards the rear end and extending from the outer surface to the inner surface.

15. The device of claim 13, wherein the through bore is tapered.

16. The device of claim 13, wherein the receiving member is selected from at least one of the group consisting of a clamping ring and a bone plate.

17. The device of claim 13, wherein the through bore has an inner wall which has at least one of the group consisting of a textured surface, a roughened surface and a knurled surface.

18. A method of clamping a Kirschner wire in a patient comprising:

providing a clamping device comprising;

a body comprising a front end, a rear end, a through bore having a dimension and extending between the front end and the rear end, a plurality of slots, an outer surface extending from the rear end to the front end, at least a portion of the outer surface being tapered so that the outer surface is larger at the rear end, and a thread along at least a portion of the tapered outer surface;

a receiving member having a tapered bore, wherein the tapered bore has an inner thread; and

a recess portion within the rear end of the body for receiving a tool for inserting the body into the receiving member;

inserting the Kirschner wire into the through bore; and

inserting at least a portion of the body into the tapered bore of the receiving member whereby the body is deformed to reduce the dimension of the through bore so that the Kirschner wire positioned into the through bore is fixed with respect to the body.

19. The method of claim 18, further comprising:

placing the receiving member against tissue of the patient;

inserting the front end of the body into the tapered bore of the receiving member;

inserting the Kirschner wire through the through bore and into tissue; and

thereafter tightening the body in the tapered bore to fixedly clamp the Kirschner wire to the receiving member.

20. The method of claim 18, wherein the deforming step is radial deformation.

21. The method of claim 18 further comprising:

unscrewing the body at least partially out of the tapered bore of the receiving member;

repositioning the body on the fixation element; and

screwing the body back into the tapered bore of the receiving member.