Closed coil spring is an additional tool in a fixed-orthodontic treatment. NiTi orthodontic alloy that has shape memory and elasticity features, while stainless steel properties of malleability, low friction between wire-bracket, as well easy soldering welding. Various closed springs have been widely studied, but research on the stretching time remains unclear. This study aimed to determine eff...

The suspension system is used to observe the vibrations from shock loads due to irregularities of the road surface. It is perform its function without impairing the stability, steering (or) general handling of the vehicle. Generally for light vehicles, coil springs are used as suspension system. A spring is an elastic object used to store mechanical energy and it can be twist, pulled (or) stret...

This paper presents design, fabrication and characterization of an electromagnetic energy harvester, which can operate at different resonance frequencies. It utilizes magnetic spring technique to scavenge energy from low frequency vibrations. The optimization of generator is done in two stages. First, optimization of a single harvester is done in terms of number of turns, coil width, coil posit...

We study the nonlinear oscillations of a forced and weakly dissipative spring– magnet system moving in the magnetic fields of two fixed coaxial, hollow induction coils. As the first coil is excited with a dc current, both a linear and a cubic magnet-position dependent force appear on the magnet–spring system. The second coil, located below the first, excited with an ac current, provides the osc...

STATEMENT OF PROBLEM Clinicians use the NiTi coil springs frequently for its appropriate mechanical properties. PURPOSE The aim of this study was to determine the effect of recycling and autoclave sterilization on the unloading forces of NiTi closed coil springs. MATERIALS AND METHOD Fourteen NiTi closed coil spring with the length of 9mm were selected. Each coil was stretched to a peak ext...

During viral entry, the paramyxovirus fusion (F) protein fuses the viral envelope to a cellular membrane. Similar to other class I viral fusion glycoproteins, the F protein has two heptad repeat regions (HRA and HRB) that are important in membrane fusion and can be targeted by antiviral inhibitors. Upon activation of the F protein, HRA refolds from a spring-loaded, crumpled structure into a coi...

UNLABELLED The Inman Aligner is a highly effective and unique evolution of the traditional spring retainer that uses super-elastic Nickel-Titanium open coil springs to move upper and lower anterior teeth with light but consistent forces, enabling correction of anterior crowding, rotations and some types of spacing. CLINICAL RELEVANCE This article describes the appliance, its uses and limitati...

An access device using a combination of a compression coil spring made of NiTi shape memory alloy (SMA) and NiTi superelastic strips has been developed. Particular consideration is given to the application of the concept in transanal endocopic microsurgery (TEM), but it could be used in other procedures where tissue expansion is required. In TEM, it could realize the gasless dilation of the rec...

An 18 month old girl with an angiographically measured ductus of 4.5 mm underwent transcatheter occlusion of the persistent arterial duct with a 17 mm Rashkind umbrella and an occluding spring coil. Severe intravascular haemolysis developed 20 hours later. Significant residual ductal leakage was noted and the residual duct measured 6 mm. Previous underestimation might have been related to ducta...

This paper presents the design, simulation, fabrication and characterization of a novel electromagnetic vibration energy harvester with sandwiched structure and air channel. It mainly consists of a top coil, a bottom coil, an NdFeB permanent magnet and a nickel planar spring integrated with silicon frame. The prototype is fabricated mainly using silicon micromachining and microelectroplating te...