The ideal graft
The ideal graft
The ideal graft should last a life time and permit blood passage without clotting or infection . The rate should be as close 100% as possible and it should show more compliance . The vessel that is used in replacing.(45) The grafts should be easy to manufacture and store impervious to blood leakage to prevent excessive blood loss and the development of perigraft hematoma , which can interfere with healing and promote infection .(46) Porosity may be essential for fabrics and other biological grafts
Characteristics of the ideal graft
Reasonably priced -readily available – variety of size – easy to store easy to manufacture – durable ( survives repeated sterilization , long life in body) suitable for use in the body (bio compatible – non toxic – non allergenic – non throbogenic infection resistant easy to handle ( easy to pass suture needle – pliable elastic – does not kink).
Requirements for finished vascular graft
1- porosity, water permeability, integral water permeability, leakage and water entry pressure .
4- relaxed internal diameter
5- pressurized internal diameter
6- wall thickness
7- suture retention strength
8- kink diameter/ radius.
The cardiac valve prostheses
The first clinical use of a cardiac - valve prosthese took place in 1952 , when Brcharles Hulngel implanted the first artificial caged ball valve for aortic insufficiency .
The first implant of a replacement valve in the anatomic position took place in 1960 since then many different types of heart valve prostheses have been developed and used in general during the past 10 years .
The surgical implantation of prosthetic heart valves has become successful . Today there are many different way making prosthetic valves , because of the various complications , which occur with different valves .