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生物体的肺除了使血液摄取氧气和排出二氧化碳进行气体交换之外,还具有新陈代谢和免疫的功能。在体外循环手术时,用人工肺来代替肺的气体交换功能。以前曾广泛采用的有空气或氧气直接相接触的鼓泡型,旋转园板型,过滤网型等。但易产生溶血和血浆蛋白的变性等,所以不能太长时间的连续使用。以后研制膜式人工肺,使血液通过薄膜与空气或氧相接触。使用的膜必须既具有血液相容性又能让氧气和二氧化碳气体渗透。即不含有被血液可抽出的物质,化学性能稳定,抗血凝,不破坏血小板,并且不使血浆蛋白变性等。此外,还需具有一定的强度,不致被由血液产生的约1公斤/厘米~2的压力所破坏,以及加工和消毒容易等。直接
In addition to blood and oxygen in the body of the lungs to discharge carbon dioxide for gas exchange, but also has the function of metabolism and immunity. In cardiopulmonary bypass surgery, artificial lungs are used instead of lung gas exchange. Used to be widely used before the air or oxygen in direct contact with the bubbling type, rotary plate type, filter type and so on. But easy to produce hemolysis and denaturation of plasma proteins, so can not be used for a long time. After the development of artificial lung membrane, the blood through the film and air or oxygen contact. The membranes used must have both blood compatibility and oxygen and carbon dioxide gas penetration. That is, does not contain substances that can be extracted by the blood, chemical stability, anti-coagulation, does not damage platelets, and does not degeneration of plasma proteins. In addition, it is necessary to have a certain strength, not to be destroyed by the pressure of about 1 kg / cm ~ 2 produced by blood, and easy to process and disinfect. direct