Single lock external fixation clamp arrangement and method

摘要

A clamping device for an external fixation system includes a post component having a yaw axis, a first clamp secured to the post component and rotatable about the yaw axis, and a second clamp secured to the post component and rotatable about the yaw axis relative to the first clamp. The device includes a tightening component configured in a manner that an action of tightening the tightening component simultaneously locks both the first and second clamps in a gripping arrangement and substantially eliminates their relative rotation about the yaw axis. Interdigitating components can be spaced apart by high spring rate biasing elements that so as to allow for smooth adjustment of the clamping device components relative to each other until the appropriate position is achieved and until after a sufficiently high clamping load has been applied.

主权项

1. A clamping device for an external fixation system, comprising:
a post component having a yaw axis; a first clamp secured adjacent to a first end of the post component and rotatable about the yaw axis, the first clamp comprising a pair of jaws cooperatively arranged to capture a fixation element, the jaws being movable between an open position that permits the fixation element to be placed between the jaws and a closed position that restricts removal of the fixation element from between the jaws; a second clamp secured adjacent to a second end of the post component and rotatable about the yaw axis relative to the first clamp; a tightening assembly associated with the first clamp, wherein the tightening assembly comprises:
a spherical washer received in a depression in an outer surface of the first clamp;a tightening component threadably engaging the first end of the post component adjacent the first clamp;a first biasing element disposed between the spherical washer and the tightening component,wherein an action of tightening the tightening component simultaneously locks both the first and second clamps and locks their rotation about the yaw axis; and a latch engaged with and moveable relative to both of the jaws, the latch being configured to translate linearly relative to the jaws to cause the jaws to be arranged in the open position and the closed position.