Apparatus and method for measuring a length between implanted bone anchors

摘要

An apparatus for measuring a distance between first and second implanted bone anchors includes a caliper body and first and second caliper arms. The caliper body has a first longitudinal axis. The first caliper arm is slidably coupled to the caliper body and has a second longitudinal axis. The second caliper arm is rotatably coupled to the caliper body and has a third longitudinal axis. The first, second and third longitudinal axes define a plane. The second caliper arm is rotatable within the plane between a first position and a second position.

主权项

1. An apparatus for measuring a distance between first and second implanted bone anchors, the apparatus comprising:
a caliper body having a first longitudinal axis; a first caliper arm slidably coupled to the caliper body and having a second longitudinal axis, wherein the first caliper arm is disposed in a fixed angular relationship to the caliper body such that the second longitudinal axis of the first caliper arm is always substantially perpendicular to the first longitudinal axis of the caliper body; and a second caliper arm rotatably coupled to the caliper body and having a third longitudinal axis, wherein the first longitudinal axis, the second longitudinal axis, and the third longitudinal axis define a plane, and the second caliper arm is rotatable within the plane between a first position and a second position.