Tissue or biological heart valve is made from animal tissue, such as porcine (pig) or bovine (cow), as it is similar to human tissue. Tissue heart valves need chemical treatment for protection and stent or frame for support. Tissue heart valves can last up to 10 to 20 years. Patients implanted with these devices do not require anticoagulation medication for a long time. Major advantages of tissue heart valves involve easy tolerance by the body and an average life expectancy of more than 15 ... Read more