Thin-walled Tube Supported by Coil Spring for Small Diameter Active Catheters

Miniscrew-supported coil spring for molar uprighting: description.

INTRODUCTION Since the beginning of miniscrews as orthodontic anchorage, many applications have been described in the literature. Among these, one is the uprighting of mesially inclined molars. In regard to the mechanical aspects, however, there is little information about the application of orthodontic forces using such devices. OBJECTIVE The objective of this study was to describe a miniscr...

The Effect of Normal Anisotropy on Thin-Walled Tube Bending

Thin-walled tube bending has common applications in the automobile and aerospace industries. The rotary-draw-bending method is a complex physical process with multi-factor interactive effects and is one of the advanced tube forming processes with high efficiency, high forming precision, low consumption and good flexibility for bending angle changes. However, it may cause a wrinkling phenomenon,...

Analysis of the Rotary-draw Bending Process for Thin-walled Rectangular Aluminum Tube

The Rotary-Draw Bending (RDB) process is a distinguished process employed for the precision cold bending of a hollow tube with small radius bends using Numerical Control (NC) machines. This research presents an analytical model based on the power law hardening model for the RDB processing of rectangular thin tubes. Based on the constraints of the tube in the dies and its thinness, the plane str...

Closure of Small Patent Ductus Arteriosus by Occluding Detachable Coil

Comparative flow rates of thin-walled and conventional-walled intravenous catheters.

The rapid administration of intravenous fluids is often a major consideration during the course of an anesthetic. This in vitro study was undertaken to compare fluid flow rates through 18- and 20-gauge intravenous catheters in both thin-wall and conventional-wall designs. All brands and types of catheters of similar sizes have the same outer diameter; however, the inner diameter may vary accord...