After cardiac bypass, the chest protector band needs to be tied for at least about a month and up to three months. The length of time should be chosen on an individualized basis under the guidance of the clinician. Heart bypass surgery is a major open-heart surgery that can cause some degree of damage to the tissues within the chest and sternum. Chest immobilization is required after surgery to reduce incision tension, promote incision healing, protect the chest incision and protect the chest. The general recovery time for the chest for bypass surgery is about 1 to 2 months, and the bandage can be removed after the sternum recovers. Basically, the bandage is tied for about one month, and the longest period of time is usually no more than three months. Special attention should be paid to the bandage, elasticity should be moderate, to prevent the skin from being compressed, causing ulcers, necrosis and so on. During the period of bandaging, pay attention to more rest, reduce physical activity, eat more high-protein diet, if any discomfort, consult a doctor in time.