Coaxial needle and severing snare

A device for treating a lesion within a living body, comprising:

• a sheath extending from a proximal end which, in an operative position, is located outside the body, to a distal end which, in the operative position is located within the body;
• a fluid injection needle having a tissue piercing tip at a distal end thereof and a fluid injection port at a proximal end thereof, the fluid injection needle extending through the sheath and defining a central lumen which extends from the fluid injection port to the tissue piercing tip;
• a snare extending within the central lumen to a loop formed in a distal end of the snare;
• a needle actuator for moving the fluid injection needle between a retracted position in which the distal tip is received within the sheath to an injection position in which the distal tip extends distally beyond a distal end of the sheath;
• and
• a snare actuator for moving the snare between a covered position in which the loop is received within the central lumen and an extended position in which the loop extends distally from the central lumen beyond the distal tip.