Pushability, steerability, torque, and opacity are characteristics of wires. The amount of force required to advance the wire is referred to as pushability. The ability and responsiveness of the wire tip to navigate vessels is referred to as steerability. When navigating vessels, torque is the response of the Guidewire Market to the operator's turning. Its opacity determines how visible it is under fluoroscopic imaging. There are two types of guide wires: solid steel or nitinol core wires and solid core wire wrapped in a smaller wire coil or braid. Coiled or braided wires are extremely flexible, pushable, and kink resistant. To improve torque control, some Boston Scientific guide wires use a nitinol tube with micro-cut slots rather than braided wire.
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