Methods and Devices for Differentiating Between Tissue Types

A method for treating or removing tissue wherein said method utilizes a tissue-identifying medical device comprising:

• an at least one first electrode;
• an at least one second electrode for contacting tissue;
• a circuit operably connected to the first and second electrode and configured to receive one or more impedance signals generated between the first and second electrode when said second electrode contacts a tissue, identify the level of impedance signal, and emit one or more observable signals indicative of one or more levels of impedance signal,
• wherein said method comprises inserting the tissue-identifying medical device into the site where tissue is to be removed or treated, using the surgical device to treat or remove tissue while simultaneously observing the signals emitted by the surgical device and adjusting the position of the surgical device in response to the emitted signals.