Do an arteriovenous fistula on the wrist. Mainly cut off the main vein at the wrist, and then because of arterial suture, some arterial blood will flow back and impact the vein, making the vein arterialized, which is convenient for later puncture.

After the operation, my fingers have gone numb. What my friend on the first floor said makes sense, but the most important thing is that the arterial blood flows to the distal end of the finger, and it will circulate back after passing through the vein under normal circumstances. But because the patient's reflux vein is cut off, a lot of blood will slowly return through other channels, such as some thinner veins and capillaries. In this way, arterial blood keeps flowing to the fingers, but it slowly flows back. Think about how your fingers will feel. After a period of recovery, I am doing fist-clenching exercises. If there is still a problem, go to the hospital for examination.