1.2 Catheterization method 1.2.1 Ca

1.2 Catheterization method 1.2.1 Catheterization method Both groups of patients were placed with a three-way valve PICC catheter. Specifically, the patient was placed in a supine position, and the puncture side upper limb abduction 900 initially positioned the blood vessel direction according to the anatomical position of the blood vessel on the elbow , And then judge the elasticity and size of the blood vessel by touching the blood vessel, and use the blood vessel mark for preliminary judgment. Measure the length of the catheter and the circumference of the upper arm + Prepare the sterile area according to the traditional PICC puncture, disinfect the puncture point, use a small long needle for venipuncture, after entering the blood vessel, feed the guide wire through the puncture needle, and act when the guide wire is delivered Gentle and should not exceed 20 cm in length. The catheter can be placed according to the smoothness and length of the guide wire. If the guide wire is not smooth or short, it proves that the blood vessel selection is not good, you can choose another vascular catheter; if the guide wire is fed smoothly and there is A certain length indicates that the vascular catheterization is basically successful. After fixing the guide wire with the left hand, remove the puncture needle, use a scalpel to expand a 3-5mm skin incision above the guide wire at the puncture point, insert the dilator and tear sheath from the tail end of the guide wire, and place it safely into the vein. The assistant opens the PICC catheter package, pre-flushing catheter, connector, separates the dilator and the intubation sheath, withdraws the dilator and guide wire together with the right hand, presses the tip of the intubation sheath with the index and middle fingers of the left hand, and blocks the sheath opening with the thumb Blood spilled. Put the catheter into the expected length with the right hand, withdraw the cannula sheath and tear it, draw the blood back, and then inject the normal saline with a 20 ml syringe. After confirming that the pipeline is unobstructed, withdraw the guide wire in the catheter according to the measurement before the puncture Cut the length of the tube, connect the joint flushing tube, sterilize the puncture point and cover the puncture point with gauze, fix it with 3M sterile transparent dressing, and indicate the length of the catheter and the puncture date, etc. Finally, take a chest radiograph to locate the end of the catheter .