Hybrid heterogeneous hydrogel formed by means of a copolymer derived from at least three of the following monomers: - a dendrimer monomer functionalised by a single branch provided with an unsaturated ethylene radical, - an acrylamide compound chosen from an N-substituted methacrylamide and an N-substituted acrylamide, and - a cross-linking agent, wherein the hybrid heterogeneous hydrogel is formed mainly by a plurality of microbeads having a diameter of more than 1.5 microns and less than 10 microns and mainly containing by weight the N-substituted methacrylamide and the N-substituted acrylamide, wherein the microbeads are assembled to define a through porous array defining three-dimensional percolating paths, wherein the through porous array defines pores the majority of the porous fraction whereof is formed by pores having a diameter comprised between 10 and 30 microns, hybrid heterogeneous hydrogel characterized in that the microbeads define closed non-communicating micropores having a size that is smaller than 20nm, the microbeads being assembled to one another to form aggregates containing between 5 and 50 microbeads, the aggregates presenting a cross-link density greater than weakly cross-linked areas allowing shifting of the aggregates in relation to each other, wherein the fraction of pores having a diameter comprised between 30 and 300 microns is more than 20%, and wherein the hybrid heterogeneous hydrogel has a viscoelastic nature and has a modulus of elasticity comprised between 1 and 200kPa. - a dendrimer monomer functionalised by a single branch provided with an unsaturated ethylene radical, - an acrylamide compound chosen from an N-substituted methacrylamide and an N-substituted acrylamide, and - a cross-linking agent, wherein the hybrid heterogeneous hydrogel is formed mainly by a plurality of microbeads having a diameter of more than 1.5 microns and less than 10 microns and mainly containing by weight the N-substituted methacrylamide and the N-substituted acrylamide, wherein the microbeads are assembled to define a through porous array defining three-dimensional percolating paths, wherein the through porous array defines pores the majority of the porous fraction whereof is formed by pores having a diameter comprised between 10 and 30 microns, hybrid heterogeneous hydrogel characterized in that the microbeads define closed non-communicating micropores having a size that is smaller than 20nm, the microbeads being assembled to one another to form aggregates containing between 5 and 50 microbeads, the aggregates presenting a cross-link density greater than weakly cross-linked areas allowing shifting of the aggregates in relation to each other, wherein the fraction of pores having a diameter comprised between 30 and 300 microns is more than 20%, and wherein the hybrid heterogeneous hydrogel has a viscoelastic nature and has a modulus of elasticity comprised between 1 and 200kPa. wherein the hybrid heterogeneous hydrogel is formed mainly by a plurality of microbeads having a diameter of more than 1.5 microns and less than 10 microns and mainly containing by weight the N-substituted methacrylamide and the N-substituted acrylamide, wherein the microbeads are assembled to define a through porous array defining three-dimensional percolating paths, wherein the through porous array defines pores the majority of the porous fraction whereof is formed by pores having a diameter comprised between 10 and 30 microns, hybrid heterogeneous hydrogel characterized in that the microbeads define closed non-communicating micropores having a size that is smaller than 20nm, the microbeads being assembled to one another to form aggregates containing between 5 and 50 microbeads, the aggregates presenting a cross-link density greater than weakly cross-linked areas allowing shifting of the aggregates in relation to each other, wherein the fraction of pores having a diameter comprised between 30 and 300 microns is more than 20%, and wherein the hybrid heterogeneous hydrogel has a viscoelastic nature and has a modulus of elasticity comprised between 1 and 200kPa.