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A fluid management system for use in a tissue resection procedure includes a controller. An inflow pump is operated by the controller and configured to provide fluid inflow through a flow path to a site in patient's body. An outflow pump is operated by the controller and configured to provide fluid

A fluid management system for use in a tissue resection procedure includes a controller. An inflow pump is operated by the controller and configured to provide fluid inflow through a flow path to a site in patient's body. An outflow pump is operated by the controller and configured to provide fluid outflow through a flow path from the site in patient's body. A motor driven resecting device may be provided for resecting tissue at the site. The controller is configured to actuate an inflow pump and an outflow pump in response to various signals and various algorithms are provided to provide malfunction warnings and assure safe operation.

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1. A fibroid treatment system, comprising: a controller;an inflow pump operated by the controller and configured to provide fluid inflow through a flow path to a patient's uterine cavity;an outflow pump operated by the controller and configured to provide fluid outflow through a flow path to the ute

1. A fibroid treatment system, comprising: a controller;an inflow pump operated by the controller and configured to provide fluid inflow through a flow path to a patient's uterine cavity;an outflow pump operated by the controller and configured to provide fluid outflow through a flow path to the uterine cavity; anda motor driven resecting device operated by the controller, the device comprising an elongate introducer having (i) a tissue extraction channel therein with a diameter of no less than 2.4 mm and (ii) an outside diameter of no more than 3.8 mm such that the device is adapted to remove fibroid tissue at a rate of at least 2 gm/min;wherein the controller is configured to actuate the inflow and outflow pumps in response to signals of fluid pressure in the uterine cavity to maintain a target pressure therein;wherein said signal of fluid pressure in the site is provided by a pressure sensor coupled to a static fluid column communicating with the uterine cavity;wherein the pressure sensor includes two independent sensing elements that both interface with the static fluid column; andwherein the controller is configured to compare pressure signals from the two independent sensing elements of the pressure sensor and to provide a warning signal and/or turn off one or more of the inflow pump and the outflow pump if the pressure signals from the two independent sensing elements are not within a preselected range from one another. 2. The fibroid treatment system of claim 1, wherein the controller is configured to operate the resecting device in response to at least one parameter selected from a group consisting of an inflow pump speed, an outflow pump speed and signals of fluid pressure in the uterine cavity. 3. The fibroid treatment system of claim 1, wherein the controller is configured to provide a fluid loss signal in response to at least one parameter selected from a group consisting of an inflow pump speed, an outflow pump speed and signals of fluid pressure in the uterine cavity. 4. A fluid management system, comprising: a controller;a first pump operated by the controller and configured to provide fluid inflow to a site in patient's body;a second pump operated by the controller and configured to provide fluid outflow from the site in patient's body;wherein the controller is configured to provide at least one operating parameter selected from a group consisting of a first pump speed, a second pump speed, and a targeted pressure in the site rate; andwherein the controller is configured to provide a fluid loss warning if the first pump speed exceeds a predetermined level for a pre-selected time interval. 5. The fluid management system of claim 4 wherein the first pump speed provides a fluid loss warning at a first predetermined level when operating in a resection mode of operation and provides a fluid loss warning at a second predetermined level when operating in a non-resection mode of operation. 6. The fluid management system of claim 5 wherein the pre-selected time interval is at least 1 second. 7. The fluid management system of claim 5 wherein the pre-selected time interval is at least 5 seconds. 8. The fluid management system of claim 5 wherein the pre-selected time interval is at least 10 seconds. 9. The fluid management system of claim 5 wherein the controller is further configured to de-activate at least one pump if the first pump speed exceeds the predetermined level for the pre-selected time interval. 10. The fluid management system of claim 5 wherein the controller is further configured to de-activate a powered resecting device positioned in the site if the first pump speed exceeds the predetermined level for the pre-selected time interval. 11. A fluid management system, comprising: a controller;an inflow pump operated by the controller and adapted to provide a fluid inflow through a flow path to a site in a patient's body; andan outflow pump operated by the controller and adapted to provide a fluid outflow through a flow path from the site in the patient's body;wherein the controller is configured to provide at least one operating parameter selected from a group consisting of a first pump speed, a second pump speed, and a targeted pressure in the site; andwherein the controller is configured to provide a blocked flow warning if a calculated power for driving the inflow pump exceeds a predetermined level for a pre-selected time interval. 12. The fluid management system of claim 11 wherein the controller is further configured to de-activate at least one pump if the calculated power for driving the inflow pump exceeds the predetermined level for the pre-selected time interval. 13. The fluid management system of claim 11 wherein the controller is further configured to de-activate a powered resecting device positioned in the site if the calculated power for driving the inflow pump exceeds the predetermined level for the pre-selected time interval. 14. A fluid management system, comprising: a controller;a first pump operated by the controller and configured to provide fluid inflow to a site in patient's body;a second pump operated by the controller and configured to provide fluid outflow from the site in patient's body;wherein the controller is configured to provide at least one operating parameter selected from a group consisting of a first pump speed, a second pump speed, and a targeted pressure in the site; andwherein the controller is configured to provide a blocked flow warning if an input voltage to the first pump is below a predetermined threshold voltage for a pre-selected time interval during which the second pump is operating. 15. The fluid management system of claim 14 wherein the pre-selected time interval ranges from 5 seconds to 120 seconds. 16. The fluid management system of claim 14 wherein the controller is further configured to de-activate at least one pump if the input voltage to the first pump falls below the predetermined level for the pre-selected time interval. 17. The fluid management system of claim 14 the controller is further configured to de-activate a powered resecting device positioned in the site if the voltage to the first pump exceeds the predetermined level for the pre-selected time interval. 18. A fluid management system, comprising: a controller;an inflow pump operated by the controller and configured to provide fluid inflow through a flow path to a site in patient's body;an outflow pump operated by the controller and configured to provide fluid outflow through a flow path from the site in patient's body;wherein the controller is configured to maintain at least one operating parameter selected from a group consisting of a first pump speed, a fluid inflow rate, a second pump speed, and a fluid outflow rate; andwherein the controller is further configured to provide a blocked flow warning if a measured current to the outflow pump exceeds a predetermined threshold current for a pre-selected time interval. 19. A fluid management system for use in a tissue resection procedure, comprising: a controller;an inflow pump operated by the controller and configured to provide fluid inflow through a flow path to a site in patient's body;an outflow pump operated by the controller and configured to provide fluid outflow through a flow path from the site in patient's body; anda motor driven resecting device for resecting tissue at the site;wherein the controller is configured to actuate an inflow pump and an outflow pump in response to signals of actual pressure at the site in the patient's body to provide respective fluid inflow and fluid outflow to maintain a target pressure at the site; andwherein the controller is configured to de-activate the motor driven resecting device upon sensing that the actual pressure in the site falls below a predetermined threshold pressure level. 20. The fluid management system of claim 19 wherein the controller is further configured to de-activate a motor that drives the resecting device if actual pressure in the site falls below a predetermined threshold pressure level. 21. The fluid management system of claim 19 wherein the controller is further configured to de-activate at least one tissue resecting electrode if actual pressure in the site falls below a predetermined threshold pressure level. 22. The fluid management system of claim 19 wherein the threshold pressure level is 100 mmHg or less. 23. The fluid management system of claim 19 wherein the threshold pressure level is 50 mmHg or less. 24. The fluid management system of claim 19 wherein the threshold pressure level is 25 mmHg or less.