MINIMALLY INVASIVE MEDICAL DEVICE WITH HELICAL PATTERN FOR INDICATING DISTANCE OF MOVEMENT

摘要

A minimally invasive medical device, including an elongate shaft that has a helical color pattern of at least an alternating first color band having a first width and second color band having a second width. Along a surface parallel to a central longitudinal axis of the shaft, a length interval between each of a plurality of occurrences of the first color band is sufficiently uniform to allow use for measurement.