Production of Capillary Pipe for Single-Use Medical Syringes

Abstract: Production technology is developed for capillary pipe used in disposable medical syringes. The heat treatment of the pipe in pure hydrogen with inert-gas injection is described. In industrial research, the annealing of the capillary pipe in an electrical furnace is optimized. The temperature field within the muffle furnace is analyzed. The optimal flow rate of protective gas and the limiting permissible flow rate of the injected gas (nitrogen and argon) are determined. The mechanical properties of the pipes (blanks) welded at Tyumen Medical-Supply Plant and manufactured at Pervouralsk New Pipe Plant (PNTZ) are studied. When using nitrogen as the protective gas instead of hydrogen, the likelihood of obtaining clean pipe surfaces is greatly increased. © 2019, Allerton Press, Inc.