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作为医用材料的基本条件,首先是对机体适合性和安全性问题。所谓机体适合性,一般是指埋入体内的材料对机体没有不良影响和两者能处于相互共存的状态。当机体埋入化学性质稳定的材料时,其离子和低分子分解物应不引起激烈的炎症反应,但是埋入的材料实际上是作为异物进入体内的,必然要引起机体的一系列反应。就连安全性材料也在其周围被结缔组织包裹而与相邻组织隔离被留置下来。这种状态表明材料能被机体所接受,被认为是组织适合性材料。相反,化学性质不稳定的材料理入机体时,其周围组织将会引起激烈的炎症反应,若材料中的
As a basic condition of medical materials, the first is the body suitability and safety issues. The so-called body suitability, generally refers to the material buried in the body without adverse effects on the body and the two can coexist with each other in the state. When the body is embedded chemically stable material, its ions and low molecular weight decomposition products should not cause intense inflammatory reaction, but the buried material is actually as a foreign body into the body, inevitably cause a series of body reactions. Even the safety material is retained around the connective tissue and isolated from the adjacent tissue. This condition indicates that the material is acceptable to the body and is considered to be a tissue-appropriate material. On the contrary, when the chemically unstable material is put into the body, its surrounding tissue will cause intense inflammatory reaction. If the material