Introduction of blunt needle buttonhole puncture method:

① Sterile towels were placed under the limbs of the patient's internal fistula side;

② Reasonable selection of arterial and venous puncture points according to the vascular conditions of patients;

③ The artery puncture point should be more than 5cm away from the anastomosis;

④ The venipuncture point should be more than 5cm away from the arterial puncture point;

⑤ Povidone iodine should be sterilized around the puncture site 8-10cm, and the puncture user should wear sterile gloves;

(6) Holding the 16-18g fistula needle, with the tip inclined upward and at a 25° Angle with the skin, the needle is inserted along the lateral edge of the blood vessel, and the needle is inserted subcutaneously after a short section of stealth into the blood vessel;

⑦ See the blood after the lower Angle, parallel needle body all send blood vessels, finally fixed needle;

⑧ Puncture method, namely, the same puncture using sharp needle at a fixed point of the patient's internal fistula, repeatedly puncture at the same Angle so that after 6-9 punctures, a scar tunnel from the skin to the wall of the vein is formed, namely, "puncture eye";

⑨ Once tunnels are formed, blunt needle puncture is used instead.

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