A cell implant matrix has a connective porosity of more than 80% and consists mainly of a mixture of bioresorbable polymers, wherein the matrix has disk-shape and wherein a surface layer on one side of the disk has less than 20% of the average pore density of the other sides.The matrix is manufactured by providing a bioresorbable polymer layer； stratifying, onto the polymer layer, a mixture of a water-soluble solid, at least two polymers differing with respect to their resorption rates, and a solvent for one of the polymers； evaporating the solvent optionally followed by compacting the mixture； and watering the compacted body to remove the salt.
