Guidewire core

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Overview

The core is usually ground to a taper towards the end for the tip to attach.

If core starts tapering more towards the tip, the wire as a whole becomes more rigid, steerable and torquable.

The opposite happens when the core tapers more proximally allowing for a longer tip.

The core may be continuous or joined (more likely to bend on wire advancement if joined)

In some wires the core extends up to the tip. In others the tip is made of a different material

Guidewire Core Composition

The guidewire core can be composed of either nitinol, stainless steel or a similar metal.

NITINOL Guidewire Cores

ADVANTAGES - NITINOL

Super-elastic alloy designed for kink resistance Excellent flexibility and steering Probably more durable nature Better trackability Less prolapse.

=DISADVANTAGES - NITINOL

Stores torque without necessarily transmitting it to the tip  Wires with single nitinol cores could “ wind up”

Less torquable

CLINICAL CORRELATION - NITINOL

Nitinol wires are more likely to enter a retroflexed circumflex

STAINLESS STEEL

Original core material technology

ADVANTAGES – STAINLESS STEEL=

Gives more pushability, torquability, and good shapeability in “core-to-tip” wires. Good support, push force and torque

DISADVANTAGES – STAINLESS STEEL

• Tendency to kink
• Less flexible than newer core materials

High tensile strength stainless steel

• More durable than regular stainless steel
• Retains shape more
• Improved flexibility
• Improved steering and tracking

Asahi Tru Torque Steel