Patent ID: 7452491
Filing Date: 2008-11-18
Classification: A61L,B29C,C12N

Abstract:
1. A method for forming scaffolds, comprising: providing a polymer feed and a dissolution agent; utilizing said dissolution agent to dissolve said polymer feed and form a solution with a specific viscosity; performing a freezing process at an operation temperature to solidify said solution and form a frozen solution with a polymer-rich phase and a polymer-poor phase wherein said polymer-poor phase is to form the porous part of the scaffold and said polymer-rich phase is to form the pore wall part of the scaffold; providing a polymer nonsolvent and adjusting the temperature of said polymer nonsolvent to be the same as or lower than said operation temperature in said freezing process; and performing a solid-liquid exchange process to replace said dissolution agent with said polymer nonsolvent and to form scaffolds.