Materials that are used for biomedical or clinical applications are known as<unk> . The following article deals with fifth generation<unk>  that are used for bone structure replacement. For any material to be classified for biomedical application three requirements must be met. The first requirement is that the material must be biocompatible; it means that the organism should not treat it as a foreign object. Secondly, the material should be biodegradable (for in-graft only); the material should harmlessly degrade or dissolve in the body of the organism to allow it to resume natural functioning. Thirdly, the material should be<unk> ly sound; for the replacement of load bearing structures, the material should possess equivalent or greater<unk>  stability to ensure high reliability of the graft.
Mechanical properties of biomaterials
Closing capacity
Nitinol biocompatibility
Fresh gas flow
Joint stability
Physiological effects in space
Gas exchange
Wound healing