Clamping assembly for external fixation system

• US 9,393,045 B2
• Filed: 03/14/2014
• Issued: 07/19/2016
• Est. Priority Date: 03/15/2013
• Status: Active Grant

• Current Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Inventors: Cresina, Jeffery T., Slagle, Paul
• Primary Examiner(s): Hammond, Ellen C
• Application Number:
  US14/212,183
• Publication Number:
  US 20140276824A1
• Time in Patent Office: 858 Days
• US Class Current: 1/1
• CPC Class Codes: A61B 17/62 Ring frames, i.e. devices extending around the bones to be positioned A61B17/6433 , A61B17/66 take precedence
• CPC Class Codes: A61B 17/6416 with non-continuous, e.g. hinged, pin-clamp connecting element A61B17/6425, A61B17/6441 take precedence
• CPC Class Codes: A61B 17/6441 Bilateral fixators, i.e. with both ends of pins or wires clamped
• CPC Class Codes: A61B 17/645 comprising a framework A61B17/6425, A61B17/6441 take precedence
• CPC Class Codes: A61B 17/6458 with pin-clamps fixed at ends of connecting element
• CPC Class Codes: A61B 17/66 Alignment, compression or distraction mechanisms
• CPC Class Codes: A61B 2017/0042 with special provisions for gripping

Abstract

A clamping assembly for an external fixation system, comprising a clamp body having an opening for receiving a bone fixation member; a pivotably rotatable locking arm associated with the clamp body, the locking arm being configured to provisionally hold the bone fixation member inside the opening of the clamp body; and a cam arm coupled to the locking arm, the cam arm being pivotably rotatable towards the clamp body to definitively hold the bone fixation member inside the opening of the clamp body.

Claims

1. A clamping assembly for an external fixation system, comprising:

a C-shaped clamp body defining an opening for receiving a bone fixation member and including opposite first and second ends;

a pivotably rotatable locking arm including first and second ends, wherein the first end of the locking arm is rotatably coupled with the clamp body at or near the first end of the clamp body, the locking arm being configured such that the second end of the locking arm is capable of fitting into a recess in the second end of the clamp body in order to provisionally hold the bone fixation member inside the opening of the clamp body; and

a cam arm including first and second ends, wherein the first end of the cam arm is rotatably coupled to the locking arm at the second end of the locking arm, the cam arm being pivotably rotatable towards the clamp body to definitively hold the bone fixation member inside the opening of the clamp body.

2. The clamping assembly of claim 1, wherein the locking arm is rotatable about a pivot pin.

3. The clamping assembly of claim 1, wherein the cam arm is rotatable about a pivot pin.

4. The clamping assembly of claim 1, wherein the opening is defined between a pair of jaws that are configured to snappingly engage the bone fixation member as the bone fixation member is introduced into the opening.

5. The clamping assembly of claim 1, wherein a portion of the clamp body includes a serrated surface that is configured to prevent the clamp body from independently rotating with respect to a second component.

6. The clamping assembly of claim 1, wherein the bone fixation member comprises a bone pin, a bone screw, a bone transfixing pin, a frame member, a rod or a bar.

7. The clamping assembly of claim 1, wherein the first end of the cam arm is capable of fitting into the recess in the second end of the clamp body.

8. The clamping assembly of claim 1, wherein the cam arm is pivotably rotatable towards the clamp body until the cam arm approximates a surface of the clamp body near the second end of the clamp body.

9. A clamping assembly for an external fixation system, comprising:

a C-shaped clamp body having and outer surface and an inner surface, the clamp body defining an opening for receiving a bone fixation member and including opposite first and second ends;

a pivotably rotatable locking arm including first and second ends, wherein the first end of the locking arm is rotatably coupled with the clamp body at or near the first end of the clamp body, the locking arm being configured such that the second end of the locking arm is capable of fitting into the second end of the clamp body in order to provisionally hold the bone fixation member inside the opening of the clamp body; and

a cam arm including first and second ends, wherein the first end of the cam arm is rotatably coupled to the locking arm at the second end of the locking arm, the first end of the cam arm is capable of fitting into the second end of the clamp body, the cam arm being pivotably rotatable towards the clamp body to definitively hold the bone fixation member inside the opening of the clamp body.

10. The clamping assembly of claim 9, wherein the locking arm is rotatable about a pivot pin.

11. The clamping assembly of claim 9, wherein the cam arm is rotatable about a pivot pin.

12. The clamping assembly of claim 9, wherein the opening is defined between a pair of jaws that are configured to snappingly engage the bone fixation member as the bone fixation member is introduced into the opening.

13. The clamping assembly of claim 9, wherein a portion of the clamp body includes a serrated surface that is configured to prevent the clamp body from independently rotating with respect to a second component.

14. The clamping assembly of claim 9, wherein the bone fixation member comprises a bone pin, a bone screw, a bone transfixing pin, a frame member, a rod or a bar.

15. The clamping assembly of claim 9, wherein the cam arm is pivotably rotatable towards the clamp body until the cam arm approximates the outer surface of the clamp body near the second end of the clamp body.

16. A clamping assembly for an external fixation system, comprising:

a C-shaped clamp body defining an opening for receiving a bone fixation member and including opposite first and second ends;

a pivotably rotatable locking arm including first and second ends, wherein the first end of the locking arm is rotatably coupled with the clamp body at or near the first end of the clamp body, the locking arm being configured to provisionally hold the bone fixation member inside the opening of the clamp body; and

a cam arm including first and second ends, wherein the first end of the cam arm is rotatably coupled to the locking arm at the second end of the locking arm, the cam arm being pivotably rotatable towards the clamp body to definitively hold the bone fixation member inside the opening of the clamp body,

wherein the clamp body further comprises a cam pocket at or near the second end of the clamp body for receiving and engaging a portion of the first end of the cam arm.

17. The clamping assembly of claim 16, wherein the locking arm is rotatable about a pivot pin.

18. The clamping assembly of claim 16, wherein the cam arm is rotatable about a pivot pin.

19. The clamping assembly of claim 16, wherein the opening is defined between a pair of jaws that are configured to snappingly engage the bone fixation member as the bone fixation member is introduced into the opening.

20. The clamping assembly of claim 16, wherein a portion of the clamp body includes a serrated surface that is configured to prevent the clamp body from independently rotating with respect to a second component.