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Why is the central venous catheter blocked?

Views:1     Author:Site Editor     Publish Time: 2021-08-18      Origin:Site

Central venous catheter is a catheter built into the blood vessel. Because of its significant advantages, central venous catheters are usually used in large veins, such as during hemodialysis. However, sometimes it is difficult to draw blood and return blood during use. This is mainly due to the symptoms of unidirectional obstruction and bidirectional obstruction of the central venous catheter. So why does this happen?

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1. One-way obstruction of catheter

One-way obstruction is easy to understand, that is, one end of the catheter is blocked. When using a central venous catheter, if the tip of the catheter is attached to the wall, it will easily cause one-way obstruction. Moreover, when the fibrin sheath is wrapped on the surface of the catheter, it is composed of cellular components. The membrane composed of non-cellular components starts at the contact point of the catheter and the vein wall and is tightly connected to the vein wall. Even if the catheter is pulled out, it is not easy to remove, resulting in unidirectional blockage. In addition, if a thrombus is formed in the blood vessel and a one-way valve is formed, it will cause one-way obstruction, making it difficult to draw blood and return blood to the Central venous catheter.

2. Two-way obstruction of catheter

There are also many reasons for bidirectional obstruction of central venous catheters. The common ones are: thrombus formation in the blood vessel due to high coagulation and incorrect tube sealing, blocking the catheter; central venous catheters are easy to be discounted; central veins are relatively narrow, resulting in Symptoms of upper limbs, chest wall and facial swelling and insufficient blood flow, etc. Once the two-way obstruction of the central venous catheter occurs, the problem of difficulty in bleeding and returning blood will also occur.

I believe that every medical institution will purchase high-quality central venous catheters after understanding which brand of central venous catheter is good. However, in the actual use process, everyone’s situation is different, so there will be catheter problems. One-way or two-way blockage is blocked. Therefore, medical institutions must take precautions and carry out the prevention of central venous catheter blockage through standardized, standardized, and procedural sealing operations.


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