Surgical fluid management systems and methods

A hysteroscopic system for use in treating tissue in a uterine cavity, comprising:

• a hysteroscope and a tissue resection probe movably positioned within the hysteroscope;
• a fluid source configured to supply a distending fluid to the uterine cavity and to receive removed distending fluid from the uterine cavity;
• an inflow pump fluidly connected to a fluid inflow lumen of the hysteroscope for providing an inflow of the distending fluid from the fluid source to the uterine cavity;
• an outflow pump fluidly connected to a fluid outflow lumen of the tissue resection probe for removing distending fluid from the uterine cavity and returning the removed distending fluid to the fluid source;
• a filter arrangement in fluid communication with the fluid outflow lumen for removing waste from the removed distending fluid before returning the removed distending fluid to the fluid source;
• and
• a controller for adjusting the flow rates of the inflow pump and of the outflow pump to maintain a pre-selected distending fluid pressure in the uterine cavity.