Electrical stimulation devices for cancer treatment

A medical device for treating a cancerous tumor comprising:

• a first lead comprising a first wire and a second wire;
• a second lead comprising a third wire and a fourth wire;
• a first electrode in electrical communication with the first wire, a second electrode in electrical communication with the second wire, a third electrode in electrical communication with the third wire, and a fourth electrode in electrical communication with the fourth wire;
• an electric field generating circuit configured to generate one or more electric fields at frequencies selected from a range of between 10 kHz to 1 MHz, wherein the one or more electric fields are effective to disrupt cellular mitosis in cancerous cells;
• a control circuitry in communication with the electric field generating circuit, wherein the control circuitry is configured to control delivery of the one or more electric fields from the electric field generating circuit;
• wherein the control circuitry causes the electric field generating circuit to generate the one or more electric fields at or near a site of the cancerous tumor located within a bodily tissue;
• wherein the first electrode and the third electrode form a supply electrode pair configured to deliver the one or more electric fields along a first vector at or near the site of the cancerous tumor;
• wherein the first lead and the second lead are each in electrical communication with the electric field generating circuit;
• and
• wherein the second electrode and the fourth electrode form a sensing electrode pair configured to measure an impedance of the cancerous tumor along a second vector independent of an impedance of the first electrode, the first wire, the third electrode, the third wire, and components in electrical communication therewith.