In various aspects, the wound therapy apparatus disclosed herein includes a wound interface that defines an enclosed space over a wound bed that is fluid tight when secured to a skin surface around the wound bed. The wound therapy apparatus includes a control group that cooperates with the wound interface to regulate input of input fluid comprising a gas having an O.sub.2 concentration greater than atmospheric air into the enclosed space and to regulate the withdrawal of output fluid from the enclosed space in order to vary an actual pressure p.sub.a within the enclosed space generally between a minimum pressure p.sub.min and a maximum pressure p.sub.max. Related methods of use of the wound therapy apparatus are disclosed herein.

A surgical fluid management system delivers fluid for distending a uterine cavity to allow cutting and extraction of uterine fibroid tissue, polyps and other abnormal uterine tissue. The system comprises a fluid source, fluid deliver lines, one or more pumps, and a filter for re-circulating the distension fluid between the source and the uterine cavity. A controller can monitor fluid retention by the patient.

A medical device is provided for irrigation of a patient wound site. The device contains a tube having a proximal portion adapted to receive an irrigation solution, a distal portion having a nozzle and an intermediate portion for transporting the solution. The tube has a barrel portion that may be manipulated by a user to position the device relative to the wound site. A distinctive nozzle has a body formed with a distally leading channel presenting a semispherical first spatial conformation and a proximally leading opening formed in the body presenting a second spatial conformation intersecting the semispherical terminus. This geometry, derived from principles of flow mechanics discussed herein, defines what will be described as an effective diameter of the nozzle. An assembly and system utilizing the device are also disclosed. The invention utilizes a fluid-isolating durable peristaltic pump for a continuous flow of irrigation solution, along with a single use tube set that embodies the device.

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.

A collapsible liquid reservoir has a flexible side wall having a lower step, a middle step and an upper step. Each of the steps includes a riser segment and a tread segment. The riser and tread segments are pivotably connected to one another at an external hinge. When the step is collapsed its segments define an acute step angle between them of about 23. When the step is expanded its segments define an obtuse step angle between them of about 115. The tread of at least one step is pivotably connected to the riser of an adjacent step at an internal hinge. The step segments joined to the internal hinge are symmetrical about a bisector of that hinge. The reservoir has a truncated pyramid shape defined by a generally square base and four trapezoidal side panels joined to one another at corners.

A method of determining a pressure of a body cavity with a controller of a fluid management system includes determining a pressure and a volume of a cuff disposed about a collapsible bag, determining a volume of the collapsible bag based on the pressure and the volume of the cuff, and determining a pressure of the collapsible bag based on the volume of the collapsible bag. The method also includes calculating a fluid flow from the collapsible bag into a body cavity from the collapsible bag and determining a pressure of the body cavity based on the fluid flow

A pump includes a cylinder, a piston and a controller. The cylinder has first and second ends and includes first and second inlet-outlet ports, each of the first and second inlet-outlet ports is configured to alternately intake a fluid to the cylinder and output the fluid from the cylinder. The piston is configured to be moved within the cylinder between the first and second ends by alternately reversing a direction of movement of the piston, so as to pump the fluid through the first and second inlet-outlet ports. The controller is configured to control the movement of the piston within the cylinder, including: (a) choosing between first and second operational modes, (b) in the first operational mode, controlling the piston to oscillate over a predefined interval that does not exceed a predefined distance from the first end or from the second end, and (c) in the second operational mode, controlling the piston to move at a selected speed between the first end and the second end.

An assembly structured for concurrent irrigation and aspiration of a nasal cavity including a housing having a supply container disposed therein for the removable retention of irrigating fluid. A nasal applicator comprises first and second passages respectfully structured to deliver irrigating fluid to the nasal cavity and concurrently remove waste fluid therefrom. An activating assembly includes a plunger biased into a continuous pressure applying, dispensing relation to the irrigating fluid and a valve assembly is selectively disposable into an open position facilitating fluid communication between the supply container and the applicator for the delivery of the irrigating fluid therethrough into the nasal cavity. The activating assembly is further structured to create a negative pressure within the chamber which communicates with the second passage of the applicator to facilitate delivery of the waste fluid therefrom along a path of travel to an interior of the chamber.

A cap and container assembly is disclosed which may be used for human body cavity irrigation or other liquid dispensing activities. The cap may include a first channel extending from a base through a neck portion to an opening in a tip portion of the cap. A side body defining a second channel may extend from the first channel near the neck portion of the cap to an opening at a distal end of the side body. An axial dimension of the tip portion may extend at an angle relative to an axial dimension of the neck portion. Liquid may flow out of the first channel under the influence of gravity and as a result of control of air flow into the second channel.

A controller for a body cavity irrigation system, where the system features a reservoir containing an irrigation liquid and a catheter, includes a housing with a dial attached to the housing and movable between positions corresponding to stages of a body cavity irrigation procedure. The controller is in communication with an electromechanical pump and at least one electromechanical valve that are in fluid communication with the reservoir and the catheter so that the electromechanical pump and at least one electromechanical valve are configured to perform a stage of the body cavity irrigation procedure corresponding to the selected dial position.