Why is PTFE used for grafts?
PTFE Grafts PFTE, also known as Teflon, is a synthetic material, readily available. It has been shown that PTFE grafts are easy to implant, cannulate with ease and carry a relatively low rate of infection. PTFE grafts can typically be used for dialysis within 2-3 weeks.
What materials are used for vascular grafts?
Expanded polytetrafluoroethylene, Dacron® and polyurethane are currently used as synthetic vascular grafts. Polyurethane is better able to match the compliance of native vasculature, but the patency rates of grafts composed of synthetic, nondegradable materials is relatively poor.
How do vascular grafts work?
A vascular graft (also called vascular bypass) is a surgical procedure that redirects blood flow from one area of the body to another by reconnecting the blood vessels.
What does PTFE mean?
polytetrafluoroethylene (PTFE), a strong, tough, waxy, nonflammable synthetic resin produced by the polymerization of tetrafluoroethylene.
What is the material PTFE?
PTFE (polytetrefluoroethylene) is a soft, low friction fluoropolymer with outstanding chemical resistance and weathering resistance. PTFE is stable at temperatures up to 500oF and it is often used in high temperature environments. PTFE also has excellent electrical insulating properties.
What are the types of vascular grafts?
In general, someone’s own vein (autograft) is the preferred graft material (or conduit) for a vascular bypass, but other types of grafts such as polytetrafluoroethylene (Teflon), polyethylene terephthalate (Dacron), or a different person’s vein (allograft) are also commonly used.
What are synthetic grafts made of?
A prosthetic graft is made out of a man-made (synthetic) polyester material. It is used to replace natural body tissues. Most grafts are in the shape of a tube to replace or repair blood vessels.
Which graft is used in CABG?
As the most commonly used bypass grafts, the internal thoracic (mammary) artery (ITA) grafts show the best long-term results. In most cases, the artery is left intact at its origin, with the opposite end sewn to the coronary artery below the site of the blockage.
What is PTFE suture?
Monotex® PTFE is a monofilament non-absorbable, sterile surgical suture composed of a strand of polytetrafluoroethylene, a synthetic fluoropolymer of tetrafluoroethylene. PTFE sutures are white. Monotex® PTFE is an excellent suture choice for dental bone grafting and implant procedures.
Is PTFE harmful to humans?
Unless it is heated over 300 ºC, PTFE is an inert, stable and non-dangerous material. Nobody should cook at this temperature. In case somebody did, PTFE degradation would produce some steam which, even though it’s not very dangerous for human health, it’s not recommended to unnecessarily breath it.
Are there different types of PTFE?
Teflon is divided into several basic types: PTFE, FEP, PFA, ETFE: 1. Teflon PTFE: PTFE (polytetrafluoroethylene) non-stick coating can be used continuously at 260°C, with a maximum operating temperature of 290-300°C, extremely low friction coefficient, good wear resistance and excellent chemical stability .
What is Dacron graft?
A Dacron graft is made out of a man-made (synthetic) polyester material. It is used to replace natural body tissues. Most Dacron grafts are in the shape of a tube to replace or repair blood vessels.