| 摘要 |
A composite porous material made of a biodegradable and absorbable polymer having a biologically active bioceramic powder dispersed therein, which has large pores (1) having a pore diameter of from 40 to 600 mum and small pores (2) having a pore diameter of 1 mum or less therein and in which at least a part of the large pores (1) and a part of the small pores (2) form together open cells to give a complex porous structure. The small pores (2) are provided in the biodegradable and absorbable polymer wall (3) and on the wall face surrounding the large pores (1). It is preferable that 40% or more of the pores, based on the total pores, form the open cells. The wall (3) surrounding the large pores (1) in the complex porous material smoothly undergoes replacement by a bone tissue, which is conducted and formed from the wall face (the inner face of the large pores (1)) toward the inside of the wall, and another bone tissue which is conducted and formed from the inner face of the small pores (2) in the wall (3) toward the area around them. Thus, it shows a high replacement ratio by the bone tissues and is almost completely replaced by the bone tissues within a relatively short time in vivo. |
