A device is prepared having cells or tissue attached to a non-degradable filamentous matrix surrounded by a semi-permeable membrane. The matrix is preferably formed of a plurality of monofilaments twisted into a yarn or woven into a mesh, and can be in the form of a cylinder. When implanting the device,...http://www.google.co.uk/patents/US6303136?utm_source=gb-gplus-sharePatent US6303136 - Cells or tissue attached to a non-degradable filamentous matrix encapsulated by a semi-permeable membrane
