左半结肠梗阻，往往造成梗阻止方肠腔扩张，肠壁水肿，并有大量气体、粪便及液体潴留。以往常先作梗阻上方造瘘，待梗阻解除后再行Ⅱ期手术。这样虽能提高手术安全系数，但也有许多不足之处，如病人经两次手术，所需费用大、痛苦多、创伤重。有的原来可切除的病灶待第二次手术 Obstruction of the left colon, often caused by the stem to prevent expansion of the intestinal lumen, intestinal wall edema, and a large number of gas, feces and fluid retention. In the past, it was often preceded by obstruction and ostomy. After the obstruction was lifted, secondary surgery was performed. Although this can improve the safety factor of surgery, there are also many deficiencies. For example, if the patient undergoes two operations, the cost is high, the pain is much, and the trauma is heavy. Some of the original resectable lesions for the second operation