Composite porous material

A - Human Necessities – 61 – L

Patent

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Details

A61L 27/44 (2006.01) A61L 27/56 (2006.01) A61L 27/58 (2006.01)

Patent

CA 2621802

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 µm and small pores (2) having a pore diameter of 1 µm 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.

La présente invention concerne un matériau poreux composite fait d'un polymère biodégradable et absorbable dans lequel est dispersée une poudre de biocéramique biologiquement active. Ledit matériau poreux composite comprend des grands pores (1) ayant un diamètre compris entre 40 et 600 µm et des petits pores (2) ayant un diamètre inférieur ou égal à 1 µm, au moins une partie des grands pores (1) et une partie des petits pores (2) formant ensemble des cellules ouvertes pour donner une structure poreuse complexe. Les petits pores (2) sont placés dans la paroi (3) du polymère biodégradable et absorbable et sur la face de la paroi entourant les grands pores (1). Il est préférable que les cellules ouvertes soient formées par au moins 40 % des pores, sur la base du total des pores. La paroi (3) qui entoure les grands pores (1) dans le matériau poreux complexe est remplacée sans à-coup par du tissu osseux, ce remplacement se faisant à partir de la face (face interne des grands pores (1)) tournée vers l'intérieur de la paroi, et par un autre tissu osseux qui se forme à partir de la face interne des petits pores (2) dans la paroi (3) et qui progresse vers la zone qui les entoure. En conséquence, le rapport de remplacement par du tissu osseux est élevé et le matériau est presque complètement remplacé par du tissu osseux en une période relativement courte in vivo.

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