FIELD: medicine. SUBSTANCE: method involves connecting a unit between air valve and tube. The unit is composed of three synchronous controllable gates. Flow through the first gate is smoothly adjusted according to patient feeling and set to be equal to a. Flow through the second and the third gate is switched on in steps equal to 2a and 4a, respectively. EFFECT: simplified operation; enabled stationary and remote flow switch. 1 dwg, 1 tbl
Authors
Dates
2003-09-27—Published
2002-01-25—Filed