Guidewire tip

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

Characterizing the Physical Characteristics of a Coronary Guidewire Using the Tip Load

One way of quantifying some of the physical features of a coronary guidewire is by using a strain gauge to measure the force needed to bend a wire when exerted on a straight guidewire tip, at a point 1 cm from the tip. Using this method, the tip loads in ascending order are (from less stiff to more stiff) 3 gm, 4.5 gm, 6 gm, 9 gm and 12 gm (ultra stiff). As stiffness increases the wire becomes prone to perforating the vessel.

Core To Tip Guidewires

When the core is extended to the tip, that increases pushability, precise steering, tip control and torquability. This can be a useful feature for eg. in probing chronic total occlusions.

With unibody wires there is more torquability, pushability and tactile feel. With two piece tip wires shaping is easy and the wire is likely to retain the shape “wire memory”

Shaping Ribbon

Incorporation of a shaping tip yields a softer tip that allows for shape retention.

Spring Coil Tip

1. Spring coil - Safer than hydrophilic coated or polymer tip wires - less risk of perforation

2. Distal weld

Spring Coils

• Outer coils only

• Tip coil only

link title

Tip Cover

• Polymer or plastic
• Provide lubricity
• Smooth tracking through tortuosity

Polymer Tip (Cover)

Polymer instead of the spring coil with hydrophilic coating

Improved trackability with the compromise of reduced tactile feedback / feel

Eg: PT Graphix™ Intermediate Guide Wire, ChoICE PT wire

”Combination” Tips

• Tip coils plus
• Intermediate coils
• Bare core
• Plastic cover
• Polymer
• Polymer over tip coils