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Different types of polymers are used in tissue engineering [45]. The existence of the genetic elements in the cells is an essential part of their viability and productivity. Cells aggregate to form tissue: growing free cells in a particular space made of a biodegradable polymer enables their injection or cultivation in a tissue. In a successful process the cells then will differentiate to form or to fill in the target tissue. Upon degrading the polymer and replicating the cells, the new cells become a part of the oriignal repaired tissue, a new technology named “tissue engineering” which offers the possibility to help in regenerating tissues damaged by disease or trauma and, in some cases, to create new tissues. Usually this is achieved through using degradable biomaterials to either induce the surrounding tissue and cell to grow or to serve as temporary scaffolds for transplanted cells to attach, grow, and maintain differentiated functions. In some trials the polymer improves the growth of the cultivated cells. Leucocytes show improvement growth on PHA polymer surface [28].