1, the first three days after the placement of the tube must be hot compresses, three times a day for 20 minutes each time, in the location of the placement of the tube to get on 10cm hot towel hot compresses to prevent the occurrence of phlebitis. (If the tube is placed in the afternoon because of time, only two hot compresses can be applied, and this time it must be done in the morning of the fourth day) 2, keep the local clean and dry. Do not tear off the film without permission. If the film is curled or loosened, or if there is sweat under the film, ask the nurse to replace it according to the standard procedure in time. 3.Patients carrying three-way valve PICC can engage in general daily work, housework and physical exercise, but avoid using this side of the arm to lift too heavy objects. Or make pull-ups, lifting dumbbells and other weight-bearing exercises. Avoid activities that involve immersion in sterile areas such as swimming. Parents should instruct their child patients not to play with the external part of the catheter to avoid damaging it or pulling it out of the body. 4.Whether a patient carrying a three-way valve PICC can take a shower depends on the overall physical condition of the patient. Doctors and nurses can advise you to take a shower, but be careful not to get the dressing wet. Before showering, you can use cling film to wrap the catheter tightly and use adhesive tape on the top and bottom. After showering, check whether the dressing is wet or not, if it is wet, you should ask the nurse to change the dressing according to the operation procedure. 5.Patients carrying three-way valve type PICC should be maintained by professional nursing staff every 7 days during the interval of treatment for flushing, changing the patch and heparin cap of PICC catheter; patients carrying end-opening type PICC need to flush the catheter daily and pay attention not to forget. 6.If the patient with three-way valve PICC has a cold, he should put on a mask when changing medicine to avoid increasing infection. 7. Pay attention to observe the drip rate when infusing, and find that the drip rate slows down significantly without artificial change. Or if it is found that there is leakage from the extracorporeal part of the catheter during infusion, notify the nurse in time to identify the cause and deal with it properly. 8. Pay attention to observe whether there is redness, pain and swelling around the needle eye and whether there is exudation, and contact the doctor or nurse promptly if there is any abnormality. 9. Pay attention to observe whether the heparin cap of the catheter is dislodged, and whether the outer part of the catheter body is broken or broken when the arm is bent, if it happens please (under normal circumstances, the catheter does not need to be clamped closed. However, if the catheter is damaged, the catheter should be closed immediately.) Fix the catheter properly and go to the hospital to replace the heparin cap or connector in time. 10. If a more permeable dressing (e.g., gauze) must be used for reasons such as allergy to the patch, please shorten the interval between dressing changes and disinfection of the puncture site accordingly. 11.When doing contrast examination, please remind the doctor not to push the contrast agent through the three-way valve type PICC catheter under high pressure. 12.If the patient cannot return to the original placement hospital for maintenance and treatment in time after discharge, please let the professional nurse do the maintenance and treatment for you in the local regular hospital. Before maintenance and treatment, please make sure that the nurse reads the “Guide to the Use of Three-way Valve PICC/MID LINE Catheter” and the “Long-term Care Manual” of Bard Three-way Valve PICC that you bring with you. Performing maintenance requires the nurse to register and sign the use/maintenance form.