POLYMER PRODUCTS

摘要

A specified porosity porous polymer product is made by precipitating polymer from a solution which contains a suspended porosifier under conditions in which the precipitate forms a solid which is rendered porous by dissolving the porosifier, and controlling the porosity by including in the solution a specific amount of a porosity controlling substance other than said porosifier. The substance may be a surfactant. The polymer product is useful as a vascular prosthesis.