Tensioning instrument

摘要

A bone plate system for securing a plurality of bones is provided including a plate member, a locking device of the bone plate, and a surgical cable having a trailing end for being connected to the bone plate and a leading end for being advanced around the bones and into the locking device. The surgical cable may be tensioned to approximate the bones, urge the bones together, and seat the bone plate against the bones. The locking device may be reconfigured to a locked configuration to fix the bone plate to the surgical cable. The bone plate further includes a plurality of throughbores for receiving bone anchors that rigidly fix the bone plate to the bones. The bone plate system utilizes the tensile strength of the surgical cable and the rigid fixation between the bone anchors and the bone plate to resist relative movement of the bones.

主权项

1. An instrument for tensioning a cable, the instrument comprising:
a body having a locking surface; a rotary tensioner rotatably mounted to the body and configured to have a cable wound thereabout; a ratchet assembly that permits turning of the rotary tensioner in a wind up direction and resists turning of the rotary tensioner in a pay out direction; a pair of gripping portions of the rotary tensioner that are rotatable relative to the body and reconfigurable with respect to one another with turning of the rotary tensioner in the wind up direction from a pass-through configuration that permits the cable to be drawn through the gripping portions to a gripping configuration that fixes the cable relative to the gripping portions for generating tension in the fixed cable; and a cam surface of the rotary tensioner configured to cammingly engage the body locking surface with turning of the rotary tensioner in the wind up direction to cause the pair of gripping portions to be reconfigured from the pass-through configuration to the gripping configuration.