An apparatus for sensing a biological tissue

An electrosurgical apparatus for sensing a condition or type of a biological tissue, the apparatus comprising:

• a control circuit, wherein the control circuit comprises an electrical connection for delivering electrical signals to the biological tissue, and wherein the control circuit is adapted to:
• deliver an electrical signal to the biological tissue for an active time period;
• obtain a charge measurement of an amount of charge stored in the biological tissue in response to the electrical signal during a sampling period after the active time period;
• determine a tissue type of the biological tissue based on the charge measurement;
• and
• generate a control signal for delivery to an energy generator for controlling the delivery of energy to the biological tissue based on the determined tissue type.