A vacuum and rate control for a breastpump

摘要

A vacuum pump for a breast pump comprising a source of vacuum for applying a level of vacuum force; a motor drive for said source of vacuum; a mechanism which alters the level of vacuum force from said source of vacuum, and which varies a rate of vacuum application; a controller, said controller providing a rate control input to said mechanism and a level control input to said mechanism such that said vacuum force is varied according to an inverse relationship with said rate, and a single manually operated switch operatively connected to said controller, said switch providing an input to said controller over a range that simultaneously adjusts said vacuum force and said rate according to said inverse relationship. (62) Divided out of 519421