PURPOSE Infrainguinalfemoropopliteal bypass (IFPB) is recommended to peripheral arterial disease (PAD) with a long occlusion of the superficial femoral artery (SFA). The aims of our study were to determine the patency of graft materials, and identify the risk factors of graft failure. METHODS From January 1995 to April 2011, we had performed 380 IFPBs in 351 patients, including 302 femoro-abo...

Interfaces between a coaxial structure and a post-wall waveguide are proposed as the essential components for cost-effective millimeter-wave modules. PTFE substrate is selected in terms of loss and manufacturability. The reflection and the transmission characteristics are investigated. The short-stepped and the short-taper-stepped feeding structures provide 14.7% and 13.2% bandwidths for the re...

In this work, the charge dynamics characteristics of injection, transport and decay in porous and non-porous polytetrafluoroethylene (PTFE) film electrets were investigated by means of corona charging, isothermal and thermal stimulating surface-potential decay measurements. The results showed that the initial surface potential, whether positively or negatively charging, is much higher in non-po...

Thermal conductivity of graphite bipolar plates (BPP) decreases with temperature. Thermal Contact resistance (TCR) between BPP and GDLs decreases with compression. GDL-BPP TCR increases with MPL and PTFE, regardless of the PTFE loading. High PTFE loading, MPL, and BPP outof-flatness increase the TCR dramatically. The graphite BPP-GDL TCR is a dominant resistance in a BPP-GDL assembly. a r t i c...

PDMS microfluidic devices whose whole inner surfaces are covered with PTFE (polytetrafluoroethylene) are described. The major problems of PDMS fluidic devices in practical use, are surface degradation with organic solvents and unexpected absorption of chemical materials. In order to overcome these problems, spin/dip-coated perfluoro amorphous polymer is used to form the passivation PTFE layer o...

This research evaluated the bone repair process after implantation of homogenous demineralized dentin matrix (HDDM) in surgical defects in the parietal bone of rabbits with alloxan-induced diabetes, using a polytetrafluorethylene (PTFe) barrier for guided bone regeneration. Thirty-six rabbits were used and divided into four groups: control (C, n = 12), diabetic (D, n = 12, left parietal bone), ...

Two different greases formulated using MoS2 and a combination of ZDDP and functionalized PTFE (F-PTFE) were examined under spectrum loading conditions where loads, frequency, and duration of the steps were treated as variables. Combination of ZDDP and F-PTFE were synergistic resulting in a significant reduction in the wear and friction under spectrum loading condition. Decreasing the time step ...

Introduction: The effects of different solid substrates including: carbon nanofibers (CNFs), activated carbon, alumina, silica, and poly vinyl pyrolidone (PVP) were compared for high pressure synthesis of polytetrafluoroethylene (PTFE, (CF2)n) nanoparticles via the adsorption of thermally synthesized tetrafluoroethylene (TFE, C2F4) as monomer. Aim: Syntheses and characterization PTFE nanopartic...

PURPOSE To determine the usefulness of slow-releasing paclitaxelin polytetrafluoroethylene/polylactide-co-glycolide (PTFE/PLGA) laminate for delayed adjustable strabismus surgery. METHODS A prospective, masked-observer, controlled study was performed in 25 rabbits. Fifty rabbit eyes were divided randomly into three groups. After recession of the superior rectus muscle (SRM), a PTFE/PLGA lamin...

A composite coating of polytetrafluoroethylene and epoxy shows 100 · improvements in wear resistance as compared to either of its constituents alone and reduced friction coefficient under testing on a pin-on-disk tribometer. This coating is made by impregnating an expanded PTFE film with epoxy, which provides three unique functions: (1) the epoxy compartmentalizes the PTFE nodes, which is belie...