The second chapter
The second chapter: of this thesis covers the practical (experimental) studies of the subject , is divided into two section , The first section includes the specifications of material used in the research and specification of the machines used in producing them , The second section covers the different methods used for sterilizing heart prostheses and finishing processes including treating fabrics with collagen and crimping by heat setting .This section is also includes the laboratory testes applied to the produced samples
The third chapter : discusses the results and discussion of the experimental examination applied to the produced samples.
