| 摘要 |
A method of cryogenically treating a tissue region is provided, including positioning a treatment region of a medical device proximate the tissue region; transferring coolant in a substantially liquid phase from a coolant reservoir to a subcooler; transitioning the coolant from the liquid phase into a supercritical state; transferring the supercritical coolant to the treatment region; changing the coolant from the supercritical state to at least one of a liquid phase and a gaseous phase at the treatment region; ablating the tissue region; and evacuating coolant from the treatment region of the medical device. |
