Application of Tearable Catheters in Angiographic and Guidance Catheters in Interventional Surgery
The use of commonly used contrast catheters and guidance catheters in interventional surgery
The use of commonly used contrast catheters and guidance catheters in interventional surgery
The use of commonly used contrast catheters and guidance catheters in interventional surgery of PTFE peelable tubing sheaths
As early as 1929, a 25-year-old German doctor, Werner Forssmann, made a small incision in his left arm and inserted a plastic catheter (reportedly used for catheterization) into his right atrium through the venous system. He then went to the radiology department and took a photo of himself to prove that the catheter was in the right atrium.
This groundbreaking work proved the feasibility of catheter technology and pioneered cardiac intervention surgery. However, this job was initially not recognized. He was swept out of the hospital and became a prisoner of war during World War II. After his release, he became a rural doctor It was not until 27 years later that his pioneering work was discovered, valued, and developed, ultimately winning the Nobel Prize in Medicine in 1956.
In the past century, with the development of anatomy, diagnostic radiology, and materials science With the development of technology, cardiac intervention technology has also undergone tremendous changes. The application of various new technologies such as sheath, guide wire, catheter, balloon, stent, valve replacement, and bypass is becoming increasingly widespread and mature. With the improvement of production technology, the guide wire, catheter, and other accessories are becoming more and more refined, and the matching medical devices are also becoming more and more perfect, such as Y-shaped connecting valves that facilitate the entry of guide wires and pressure pumps for balloon expansion, Convenient three-way for infusion or contrast agent input selection, postoperative compression hemostatic bags, etc., even lesions located in small branches of the coronary artery can be corrected. Here is a brief introduction to the differences between commonly used contrast catheters and guidance catheters in cardiac intervention.
The function of the contrast catheter is mainly to inject contrast agent into the coronary artery for diagnostic purposes. The purpose of the guiding catheter is to introduce therapeutic devices such as wires, balloons, and stents. Therefore, from a functional perspective, the biggest difference between the imaging catheter and the guiding catheter lies in diagnosis and treatment. They are basically composed of three layers of structure: the outer layer is made of special polyethylene plastic material, which is related to the shape, hardness, and friction with the vascular intima of the catheter; Middle layer: Steel wire woven structure, ensuring that the conduit does not collapse and is resistant to breakage; Inner layer: Nylon PTFE coating. It has a certain lubricating effect and can reduce the friction force when contrast agents, guide wires, balloons, or other instruments pass through.
Compared to contrast catheters, guide catheters require higher manufacturing processes, and with the same outer diameter, the inner cavity is required to accommodate devices such as guide wires, balloons, and stents. In order to better enter the blood vessels, the head ends of the imaging catheter and the guidance catheter are designed in different shapes for different coronary artery branches.
In addition to imaging catheters and guidance catheters used for the heart, there are also some catheters used for peripheral purposes, such as nerves and blood vessels, abdominal aorta, uterine artery, etc.
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