Fibroid ablation positioning device and methods

A method of treating a target fibroid or other tumor in a patient using a needle probe including at least one electrode located on the needle probe and using a first return electrode and a second return electrode located remote from the needle probe, the method comprising:

• measuring a bulk tissue property including complex impedance information indicative of a location of at least a portion of the needle probe with respect to the target fibroid or other tumor, the impedance information determined using the at least one electrode located on the needle probe and at least one of the first and second return electrodes located remote from the needle probe;
• providing a user with an indication of the location of at least a portion of the needle probe with respect to the target fibroid or other tumor based on the complex impedance information;
• delivering ablation energy to the target fibroid or other tumor via the needle probe when the needle probe is at a desired location determined using the indication of the location of at least a portion of the needle probe with respect to the target fibroid or other tumor based on the complex impedance information;
• providing the user with an indication of a condition of the target fibroid or tumor based upon the bulk tissue property during or after the delivering ablation energy to the target fibroid or tumor;
• controlling the delivering ablation energy to the target fibroid or other tumor via the needle probe using the indication of the condition of the target fibroid or tumor based on the complex impedance information.