Integrity testing method and apparatus for delivering vapor to the uterus

A uterine treatment device, comprising:

• a shaft sized and configured for insertion into a uterus of a patient;
• a sealing balloon disposed on the shaft and for sealing the uterus;
• an inflow lumen and an outflow lumen disposed along a length of the shaft;
• at least one inflow port disposed at a distal end of the inflow lumen;
• at least one outflow port disposed at a distal end of the outflow lumen;
• a one way valve disposed in the inflow lumen and configured to reduce or eliminate retrograde flow from the uterus back through the uterine treatment device;
• a gas/fluid source operatively coupled to the inflow lumen and the outflow lumen;
• at least one flow meter disposed between the gas/fluid source and the shaft;
• and
• a controller configured to perform a uterine integrity test by delivering gas or fluid from the gas/fluid source through the inflow lumen into the uterus without allowing for gas or fluid to be removed from the uterus, detecting with the at least one flow meter an integrity flow rate of gas or fluid as the gas or fluid is delivered into the uterus, and determining that the uterus is sealed if the integrity flow rate decreases below an integrity flow rate threshold value.