Tissue products produced from biomaterials are generally; Medical implants include biocompatible and biodegradable products suitable for clinical use, such as artificial hip joints and other joint replacements, intraocular lenses, dental implants, cochlear implants, bone implants, heart and aortic valves, stents for the repair of heart coronary arteries, vascular grafts, and breast implants. All of these are intended for more or less permanent use on the body. Research and development activities include the discovery and production of tissue products using tissue engineering technologies.