Methods for evaluating the integrity of a uterine cavity

1. A system for treating a patient's uterus, said system comprising:

a probe having a working end adapted to be positioned in a patient's uterine cavity;

means for introducing a first fluid into the uterine cavity exterior of the working end;

means for introducing a second fluid into the working end;

means for performing a first monitoring test for a first flow rate of the first fluid introduced into the patient's uterine cavity;

means for performing a second monitoring test for a second flow rate of the second fluid introduced into the working end;

means for characterizing a uterine wall as being intact based on a combination of the first and second monitoring tests, wherein the means for characterizing the uterine cavity as being intact comprises means for determining whether the first flow changes during the introduction of the second fluid into the working end; and

means for actuating an ablation mechanism in the working end.

2. The system of claim 1 wherein the actuating means is automatically actuated by a controller.

3. The system of claim 1 wherein the means for performing the first monitoring test and the second monitoring tests performs the first and second monitoring tests contemporaneously.

4. The system of claim 1 wherein the means for performing the first monitoring test and the second monitoring tests performs the first and second monitoring tests sequentially.

5. A system of characterizing a patient's uterus, comprising:

a probe having a working end adapted to be positioned in a patient's uterine cavity;

means for flowing a first fluid into the working end;

means for flowing a second fluid into the uterine cavity exterior of the working end;

means for recording a first pressure in the first fluid during the second fluid flow;

means for recording a second pressure in the first fluid after termination of the second fluid flow;

means for comparing the first and second pressures to thereby characterize the uterine wall as perforated or non-perforated,

wherein the first pressure being greater than the second pressure characterizes the uterine wall as non-perforated, and

wherein the first pressure not being greater than the second pressure characterizes the uterine wall as perforated.

6. The system of claim 5 further comprising means for actuating an ablation mechanism carried by the working end.

7. The system of claim 6 wherein the means for actuating is automatically actuated by a controller.

8. A system for characterizing a patient's uterus, said system comprising:

an expandable structure positionable in a patient's uterine cavity, the expandable structure comprising an expandable thin wall sheath;

means for inflowing a first gas into the uterine cavity exterior of the expandable structure;

means for inflowing a second gas into the expandable thin wall sheath;

means for monitoring a flow rate of the inflow of the first gas with a flow meter; and

means for determining whether the first rate changes during an inflow of the second gas into the expandable thin wall sheath to characterize a uterine wall as being perforated.

9. The system of claim 8 wherein the means for inflowing the second gas into the expandable thin wall sheath is configured to activate at least 2 seconds after the means for inflowing the first gas into the uterine cavity is activated.

10. The system of claim 8 wherein the means for inflowing the second gas into the expandable thin wall sheath is configured to inflow the second gas at a flow rate of 0.8 SLPM.

11. The system of claim 8 wherein the expandable structure comprises a frame in an interior chamber of the expandable thin wall sheath, further including means for applying a negative pressure to the interior chamber to suction the expandable thin wall sheath against the frame.