| 摘要 |
This invention relates to a seamless system for controlling the flow of fluids, such as liquids or compressed air, through a non-fragmented length of flexible tubing. It incorporates into a single system a number of functions currently performed with separate valves within conventional dental handpiece fluid flow control units. The invention can be fitted to an existing flexible fluid supply line, within a dental delivery system without destructive insertion or removal of any intermediary parts and without contact with the fluid medium itself. The invention is conceived to accommodate from the outside, three contiguous portions (a first, an intermediate and a second portion) of a non-fragmented length of flexible tubing. It comprises a tube holder for securing the first tubing portion, a tube guide for guiding the movement of the second tubing portion relative to the first portion thereby providing selectively a folding or unfolding action to the intermediate tubing portion, so as to prevent fluid flow in said tubing by folding the intermediate portion into a closed position, or to permit flow by unfolding the intermediate portion into an open position. It further comprises actuation means for moving back and forth the second tubing portion along the tube guide.
|
