临床应用的肝素是从动物的肝、肺、肠等组织中提取的多相粘多糖.肝素在体内、外均有迅速的抗凝作用,目前仍然是最有效的抗凝剂,且临床需要量逐年增加,如美国每年以300亿单位的速度增长,现每年用量已超过10000亿单位.国内、外肝素的应用领域广阔,如在DIC、肝衰、肾衰、脑衰、呼吸衰竭、心力衰竭等内科危重病中, Clinical application of heparin from the liver, lung, intestine and other tissues extracted from the multi-phase mucopolysaccharide heparin in vivo and in vitro have rapid anticoagulant effect, is still the most effective anticoagulant, and clinical requirements Increasing year by year, such as the annual increase of 30 billion units in the United States, the present annual dosage has exceeded 1 trillion units.While at home and abroad, heparin has a wide range of applications such as DIC, liver failure, renal failure, brain failure, respiratory failure, heart failure In medical critical illness,