Vapor ablation systems and methods

A prostate treatment device, comprising:

• an introducer shaft;
• a vapor generator configured to generate a condensable vapor;
• a vapor delivery needle in communication with the vapor generator and slidably disposed within the introducer shaft a magnet attached to the needle;
• and
• an actuator configured to selectively simultaneously apply to the magnet a first, repelling, force in a first direction and a second, attracting force in the first direction in order to move a distal tip of the vapor delivery needle between a retracted position inside the introducer shaft and an extended position at least partially outside of the introducer shaft, wherein the actuator includes a second magnet configured to generate a first magnetic field having a first polarity and a third magnet configured to generate a second magnetic field having a second polarity, and wherein the first polarity is opposite to the second polarity.

A prostate treatment device, comprising:

• an introducer shaft;
• a vapor generator configured to generate a condensable vapor;
• a vapor delivery needle in communication with the vapor generator and slidably disposed within the introducer shaft;
• a magnet attached to the needle;
• a solenoid actuator disposed around the magnet, wherein the solenoid actuator comprises a first winding and a second winding;
• and
• a power supply configured to supply at least one current to the solenoid actuator, wherein the supply of the at least one current simultaneously causes (a) the first winding to generate a first magnetic field having a first polarity, and (b) the second winding to generate a second magnetic field having a second polarity, wherein the first polarity is opposite to the second polarity, wherein the first magnetic field shares a polarity with the magnet, and wherein the second magnetic field has a polarity opposite to a polarity of the magnet.