Intimal hyperplasia is one of the prominent failure mechanisms for arteriovenous fistulas and arteriovenous access grafts. Human tissue-engineered vascular grafts (TEVGs) were implanted as arteriovenous grafts in a novel baboon model. Ultrasound was used to monitor flow rates and vascular diameters throughout the study. Intimal hyperplasia in the outflow vein of TEVGs was assessed at the anasto...

PTFE/GF(glass fiber) composites are widely applied in high-frequency printed circuit board (PCB) substrate materials due to the excellent dielectric properties of PTFE and low thermal expansion coefficient GF. However, poor interface compatibility between GF affects performance composite substrates. In this study, tetraethyl orthosilicate (TEOS) was used as silicon source, polydimethylsiloxane ...

Optical waveguide lightmode spectroscopic (OWLS) techniques were probed for monitoring ion permeation through channels incorporated into artificial lipid environment. A novel sensor set-up was developed by depositing liposomes or cell-derived membrane fragments onto hydrophilic polytetrafluoroethylene (PTFE) membrane. The fibrous material of PTFE membrane could entrap lipoid vesicles and the wa...

The chemical inertness, high melting point, and intrinsic lubricity of polytetrafluoroethylene PTFE have been used to develop solid lubricating parts for operation in extreme environments, from frying pans to satellites. The atomic-level mechanisms associated with friction and wear at PTFE surfaces are elucidated here by systematic investigations of the frictional anisotropy measured with respe...

We report the successful treatment of a patient with hemifacial spasm due to a tortuous vertebral artery that appeared to have developed to compensate for agenesis of the ipsilateral carotid artery. The 51-year-old man presented with a 1-year history of progressive left hemifacial spasm. His medical history was otherwise unremarkable except for untreated mild hypertension. Magnetic resonance an...

Many surgeons consider PTFE to be the conduit of choice for above-knee femoropopliteal bypass grafting, since PTFE is relatively easy to implant and spares autogenous saphenous vein (ASV) for subsequent peripheral or coronary artery bypass grafting (CABG). This practice has recently been challenged, as some studies have suggested that ASV may exhibit superior patency in certain patient subgroup...

Thermoplastic copolyester elastomer (TCE) and Polyoxymethylene (POM) filled polytetrafluroethylene (PTFE) composite, reinforced with short glass fiber (SGF) and different shape microfillers such as short carbon fiber (SCF), silicon carbide (SiC) and alumina (Al2O3) were prepared by melt mixing method using twin screw extruder followed by injection moulding. Mechanical properties such as tensile...

A polytetrafluoroethylene (PTFE)-covered stent is specially used to treat coronary perforation complicating percutaneous intervention in order to prevent the aneurysm from rupturing, but until now it has not been known if endothelialization occurs inside this type of stent. A patient with a giant aneurysm of the right coronary artery underwent successful implantation of a PTFE-covered stent. An...

Samples of DuPont 7A and 7C Teflon (PTFE, poly(tetrafluoroethylene)) were tested in compression at strain-rates between 10 and 1 s and temperatures between K198 and 200 8C. Additionally, using a Split-Hopkinson pressure bar, a temperature compression series was undertaken between K100 and 150 8C at a strain rate of 3200 s. To investigate the small-strain response, strain gauges were used to mea...

The aim of the study was to evaluate the possibility to obtain guided bone regeneration with two types of physical barriers (calcium sulfate and PTFE nonporous barrier) in surgical defects created in rat parietal bones. In the right parietal bone the calcium sulfate barrier filled out the whole defect and in the left parietal bone the barrier of PTFE was positioned in the floor and externally t...