Guidewire tip: Difference between revisions
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==Core To Tip Guidewires== | ==Core To Tip Guidewires== | ||
When the core is extended to the tip, that increases pushability, precise steering, tip control, tactile feel and torquability. This can be a useful feature for example in probing [[chronic total occlusions]]. If there is a two piece tip to the guidewire, then shaping is easy and the wire is likely to retain its shape, a property called “wire memory”. | |||
[[Image:core_to_tip.jpg]] | [[Image:core_to_tip.jpg]] | ||
==Shaping Ribbon== | ==Shaping Ribbon== | ||
Revision as of 21:07, 23 October 2011
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
Overview
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.
Determinants of Tip Flexibility
There can be one or more joints made of different materials in the tips of guidewires. The number of joints and the nature of the joints can influence the clinical performance of the wires. These joints can serve as hinge points and bend during guidewire passage.
Core To Tip Guidewires
When the core is extended to the tip, that increases pushability, precise steering, tip control, tactile feel and torquability. This can be a useful feature for example in probing chronic total occlusions. If there is a two piece tip to the guidewire, then shaping is easy and the wire is likely to retain its shape, a property called “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
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