Porous material and method for fabricating same

C - Chemistry – Metallurgy – 08 – J

Patent

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C08J 9/26 (2006.01) A61L 31/06 (2006.01)

Patent

CA 2627895

A method for fabricating a porous structure from a first material. The method comprises the acts of mixing the first material with a second material to form a mixture, the first material having a melting point which is lower than the second material, heating the mixture under pressure to a temperature between a melting point of the first material and a melting point of the second material, cooling the molten mixture until it hardens and removing the second material from the first material. The method may also include a subsequent annealing step. There is also described a material suitable for implant, illustratively vertebral or spinal implants, comprising a rigid biocompatible polymer such as PEEK comprising a plurality of interconnected pores. The polymer illustratively has a porosity of between 50% and 85% by volume and in a particular embodiment is able to withstand pressures of up to 20 MPa. The porous PEEK material may also have a minimum thickness in any dimension of one (1 ) inch.

L'invention concerne un procédé de fabrication d'une structure poreuse à partir d'un premier matériau. Le procédé consiste à mélanger le premier matériau avec un second matériau pour former un mélange, le premier matériau présentant un point de fusion inférieur à celui du second matériau, à chauffer le mélange sous pression à une température entre le point de fusion du premier matériau et le point de fusion du second matériau, à refroidir le mélange fondu jusqu'à ce qu'il durcisse, et à retirer le second matériau du premier matériau. Le procédé comprend également une étape de recuit. L'invention concerne également un matériau adapté pour un implant, par exemple des implants vertébraux ou médullaires, comprenant un polymère rigide biocompatible tel que PEEK, présentant une pluralité de pores interconnectés. Le polymère présente une porosité variant de 50 % à 85 % par volume et, dans un mode de réalisation particulier, il peut supporter des pressions allant jusqu'à 20 Mpa. Le matériau PEEK poreux peut également présenter une épaisseur minimale dans toute dimension d'un (1) pouce.

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