What is a contrast guidewire?

Guidewire is one of the basic instruments for coronary intervention, which is used to enter the coronary artery or cross tortuous, calcified, stenosis, collateral circulation to reach the target, to establish a track to deliver balloons, stents and micro catheters; for guidewire upgrading or downgrading techniques to open coronary artery occlusive lesions; to enter the coronary artery branches beforehand to do the protection and signposting function, and so on.

While the contrast guidewire is a major branch of the interventional guidewire, there are two types of contrast guidewires commonly used in clinical practice, one is the ultra-smooth guidewire, also known as loach guidewire, and the other is the J-type guidewire, also known as the diagnostic guidewire. The ultra-smooth guidewire is mainly used to assist in feeding the contrast tube, and the guidewire can be exchanged directly after the completion of the imaging to start the intervention. The J-type guidewire is not easy to enter the branch, but it is shorter in length, and the guidewire cannot be exchanged directly after the completion of contrast.

The J-shaped guidewire has a J-shaped bend at the tip, which has the advantage that the tip of the guidewire will not be pushed against the vessel wall when the vessel is curved and deformed during catheterization, thus preventing damage to the vessel.There are several types of J-shaped guidewire bends, including large, medium, and small. The small size bend is suitable for blood vessels; the large size bend can help to adjust the direction of intubation, and in the bile ducts and other areas with changes in direction, the guidewire can be inserted into the branches in different directions with the help of the guidewire bend.

Ultra-smooth guidewire is also known as loach guidewire because of its black appearance. Its guidewire hardness is divided into ordinary, soft and ultra-hard types, and its guidewire head end can be divided into straight head shape and curved J-type, of which ordinary hardness J-type guidewire is commonly used. Some special types of hydrophilic membrane guidewires have a weak folding resistance at the head end, which can be easily bent under external force. The head end can be molded into a mesh basket shape for stirring and dissolving thrombus, which is used for stirring and dissolving treatment in thrombosis in the inferior vena cava, hepatic vein, and thrombosis in the aorta.

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