Liner extraction methods
Methods and apparatus for the treatment of a body cavity or lumen are described where a heated fluid and/or gas may be introduced through a catheter and into treatment area within the body contained between one or more inflatable/expandable members. The catheter may also have optional pressure and temperature sensing elements which may allow for control of the pressure and temperature within the treatment zone and also prevent the pressure from exceeding a pressure of the inflatable/expandable members to thereby contain the treatment area between these inflatable/expandable members. Optionally, a chilled, room temperature, or warmed fluid such as water may then be used to rapidly terminate the treatment session.
1. A method at withdrawing a liner from a tissue surface, comprising:
positioning an elongate probe into a uterine cavity to be treated;
expanding a liner enclosing the probe into contact against the tissue surface of the uterine cavity by infusing one or more puffs of air into the interior of the liner until the liner conforms to the uterine cavity;
infusing a cryoablative fluid or gas via the elongate probe and within an interior of the liner such that the cryoablative fluid or gas contacts the interior of the liner and tissue surface in contact with the liner is ablated;
applying a negative pressure within the interior of the liner such that the liner is peeled away in a normal direction from the tissue surface.
2. The method of claim 1 wherein positioning an elongate probe comprises introducing the elongate probe through a cervix and into the uterine cavity.
3. The method of claim 1 wherein infusing a cryoablative fluid or gas comprises infusing nitrous oxide into the interior of the liner.
4. The method of claim 1 wherein applying a negative pressure further comprises withdrawing the cryoablative fluid or gas from the interior of the liner.
5. The method of claim 1 wherein applying a negative pressure further comprises ceasing infusion of the cryoablative fluid and evacuating the interior of the liner through the elongate probe.
6. The method of claim 5 wherein evacuating the interior of the liner comprises switching a valve in fluid communication between a pump and the interior of the liner.
7. The method of claim 1 wherein infusing a cryoablative fluid or gas comprises maintaining an insulative annular spacing or gap between a sheath assembly and the interior of the elongate probe.
8. The method of claim 1 further comprising monitoring a pressure of the interior of the liner while infusing the cryoablative fluid or gas.
9. The method of claim 1 further comprising monitoring a temperature of the uterine cavity while infusing the cryoablative fluid or gas.
10. The method of claim 1 wherein expanding a liner further comprises detecting for a leak.
11. The method of claim 1 further comprising introducing a fluid or air into the interior of the liner to warm the liner after infusing the cryoablative fluid or gas.
12. The method of claim 1 further comprising heating the interior of the liner to warm the liner after infusing the cryoablative fluid or gas.