A fluid delivery system, method, and apparatus for providing instillation therapy with a negative-pressure source is described. The apparatus includes a housing having an ambient chamber and a negative-pressure chamber fluidly isolated from each other. The apparatus also includes a moveable barrier disposed in the housing between the ambient chamber and the negative-pressure chamber. The moveable barrier is operable to move between a charge position and a discharge position in response to negative pressure. A fluid source is disposed in the negative-pressure chamber and is collapsible in response to movement of the moveable barrier to the discharge position. The apparatus also includes a fluid outlet in fluid communication with the fluid source, a negative-pressure port in fluid communication with the negative-pressure chamber and configured to be coupled to a negative-pressure source, and a vent formed in the housing and fluidly coupled to the ambient chamber.

A perfusion target internal pressure estimation method includes, at a time of a first operation for feeding liquid and not suctioning the liquid, acquiring a liquid feed flow rate in a liquid feed passage and pressure in a suction passage, at a time of a second operation for feeding the liquid and suctioning the liquid, acquiring a liquid feed flow rate in the liquid feed passage and a suction flow rate in the suction passage, subtracting the suction flow rate from the liquid feed flow rate to acquire a flow rate difference, and acquiring, based on a regression formula of the liquid feed flow rate and the pressure in the suction passage at the time of the first operation, an estimation value of an internal pressure of a perfusion target at the time of the second operation from the flow rate difference.

A suction and irrigation implement includes a handpiece, a pair of aligned adjacent valve assemblies, a rocker and a hub. The body may be transparent to allow visualization of aspirated substances. The valve assemblies include a plunger with a conical core that increases the area of the valve opening with increased depression. The rocker, a pivoting actuator, opens one valve assembly at a time, thereby preventing simultaneous irrigation and suction. A suction and irrigation tube connects to the hub, which may be rotated to adjust the orientation of the tube, while the implement is in use. Detents define specific orientations.

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 system for extracting lens material from an eye including an instrument having a first aspiration pump driven by a drive mechanism having a motor, and an elongate member sized and configured to extend through an anterior chamber to a capsular bag of the eye. The elongate member configured to be oscillated by the drive mechanism includes an inner lumen fluidly coupled to the first aspiration pump and defining at least a portion of an aspiration waste line, and an open distal end having a distal cutting tip. The system can further include a fluid system remote from the surgical instrument including a second aspiration pump and a fluid line configured to deliver background aspiration from the second aspiration pump to the inner lumen of the elongate member to aspirate the lens material from the eye towards the inner lumen. Related devices, systems, and methods are also provided.

A wound therapy system includes a dressing sealable over a wound and defining a wound space between the dressing and the wound, tubing fluidly communicable with the wound space, and a canister fluidly communicable with the tubing. The canister, the tubing, and the dressing define a sealed space that includes the wound space. The wound therapy system also includes a therapy unit coupled to the canister. The therapy unit includes a sensor configured to measure a pressure in the sealed space, a valve positioned between the sealed space and a surrounding environment and controllable between an open position and a closed position, and a control circuit. The control circuit is configured to control the valve to alternate between the open position and the closed position to allow airflow through the valve, receive measurements from the sensor, and determine a volume of the wound space based on the measurements.

A suction/irrigation medical device comprises a valve body having one or more conduits fluidically coupled thereto and a first channel extending through the valve body. The medical device also comprises a first valve plunger disposed along the first channel and configured to move along an axis to open and close the first channel. The first valve plunger has a first opening to permit a fluid to flow through the first channel. The medical device also comprises a second valve plunger disposed along the first channel and along a second channel to couple the second channel into the first channel when the second valve plunger is in a first position. The second valve plunger has a second opening that has at least one dimension that is greater than a corresponding dimension of the first opening of the first valve plunger.

A fluid distribution system can include a water inlet configured to receive water from a supply spout. A supply line can be connected to the inlet, and an applicator tip can be connected to the supply line distal from the inlet. The applicator tip can be configured to spray water received through the supply line at the same time as the receiving of the water from the supply spout through the inlet. The system can further include a water pressurizing device that is operable to pressurize water received from the supply spout via the water inlet and supplied through the supply line to the applicator tip. The water pressurizing device can include one or more of a powered fluid pump and a source adapter. The system may include a fluid-actuated pressure clamp.

A pump and pump controller which uses an algorithm to quickly achieve and maintain a stable plasma field in a surgical site are provided. The algorithm calculates an electrical characteristic value to determine if the suction rate by the pump should be increased or decreased to achieve a stable plasma field. A method of using such a pump and pump controller is also provided.

In one embodiment, an irrigated medical system includes a medical tool, an irrigation line configured to fluidically connect an irrigation reservoir storing irrigation fluid to the medical tool, and provide at least some of the irrigation fluid to the medical tool, a force sensor configured to be coupled with the irrigation reservoir, and provide a signal responsively to a force exerted by the irrigation reservoir on the force sensor over time as irrigation fluid in the irrigation reservoir is depleted, and a controller configured to find an irrigation rate of the irrigation fluid flowing in the irrigation line responsively to the signal.