Auxiliary positioning standard model for PICC (Peripherally Inserted Central Catheter) under real-time guidance of B ultrasound

The invention belongs to the field of medicine, and discloses an auxiliary positioning standard model for PICC (Peripherally Inserted Central Catheter) under real-time guidance of B ultrasound. The standard model is mainly composed of one target spot, one main path and nine auxiliary positioning target spots, the auxiliary positioning standard model for the PICC operation needs assistance of B ultrasound, and the standard model is used for auxiliary positioning in the PICC operation. B ultrasonic imaging is carried out in advance in the advancing direction of the catheter, and the catheter is rotated to adjust the relative position of the catheter and the venous duct of the patient according to the relative position of the auxiliary target spot and the advancing head end of the catheter so as to enable the advancing head end of the catheter to be free of ectopic in the advancing process. The relative position comprises a near-side vein tube wall of the auxiliary target spot and a far-side vein tube wall of th