A volume of a wound is estimated using a dynamic pressure response measured during instillation of fluid to the wound using a negative pressure wound therapy system. A previously estimated wound volume may be used to detect and prevent overfill of fluid to the wound during future instillation events. For example, real-time pressure measurements may be compared to model data representative of expected pressure at a wound having a volume equal to the previously estimated wound volume, with instillation being stopped if the observed pressure varies from the expected pressure. A comparison of a total volume of fluid instilled to the wound may also be compared to the previously estimated wound volume to prevent overfill. The comparison of wound volume estimated based on an instillation event may also be compared to a wound volume estimated using other methods to provide a higher confidence wound volume estimate.

A hysteroscopic fluid management system includes a saline source with an electrolyte concentration, at least one pressure mechanism for circulating saline to and from a targeted site and through a filter having filter characteristics back to the source, and a controller. The controller provides a saline inflow in a first flow path to the site and a saline outflow in a second flow path from the site through the filter and back to the source at a controlled flow rate. A diagnostic or therapeutic procedure is performed at the site in the presence of the saline. The filter characteristics and the controlled flow rate are selected to (1) cause substantially no change in the electrolyte concentration in the saline, (2) to prevent hemolysis of greater than 5% of filtered red blood cells exposed to the saline, and/or (3) to minimize effect on prothrombin time of plasma exposed to the filter.

A pump and a 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 a suction rate by the pump should be increased or decreased to achieve the stable plasma field. A method of using the pump and the pump controller is also provided.

A peristaltic pump includes a first motor shaft, a second motor shaft, a first pump head, a second pump head, and a motor. The first pump head is operably coupled to the first motor shaft such that the first pump head is rotated in response to rotation of the first motor shaft. The second pump head is operably coupled to the second motor shaft such that the second pump head is rotated in response to rotation of the second motor shaft. The motor is configured to rotate the first and second motor shafts. The pump head has a first mode in which the first pump head is rotated and the second pump head is idle and a second mode in which the first pump head is idle and the second pump head is rotated.

An apparatus, system and method of controlling the flow rate of an irrigation fluid. The apparatus, system and method include modifying a pressure gravitationally above the irrigation fluid in a fluid reservoir to increase the flow rate through a surgical pack by iteratively controlling infusion of gas to the fluid reservoir. The iteratively controlling comprises sensing an in-range response to said modifying, wherein the infusion of gas is enabled; and sensing an out-of-range response to said modifying. If, based on prior ones of said modifying: the out-of-range response poses no danger to a patient, the infusion of gas is enabled; the out-of-range response poses a substantial danger to the patient, the infusion of gas is disabled; or the out-of-range response poses no substantial danger to the patient, the iteratively controlling comprises applying a successive series of modifications to correct the out-of-range response.

A peristaltic pump includes a first motor shaft, a second motor shaft, a first pump head, a second pump head, and a motor. The first pump head is operably coupled to the first motor shaft such that the first pump head is rotated in response to rotation of the first motor shaft. The second pump head is operably coupled to the second motor shaft such that the second pump head is rotated in response to rotation of the second motor shaft. The motor is configured to rotate the first and second motor shafts. The pump head has a first mode in which the first pump head is rotated and the second pump head is idle and a second mode in which the first pump head is idle and the second pump head is rotated.

The oral irrigation/liquid delivery device provides flow controlled fluid to body areas specifically the mouth, or parts of body or other non-body areas via pump device or connection to water source through a wand handle with bulbous smooth head with multiple openings/orifices for the fluid to flow to ensure that no high-pressure jets result (unless within the design) and can be used in confined area; idea for irrigating or rinsing the mouth after jaw surgery or other situation where it is not possible or recommended to use a high-pressure “water pick” type of device; allows user who may have a problem sucking in water to rinse to have fluids safely delivered to mouth to clear and clean it; allows for the delivery of medicated and or other liquid delivery of water or any other liquid to rinse or even imbibe; said device could also deliver feeding fluids; optional connection via any pump or faucet diverter system to delivery fluids, including option to have a siphon mix of one solution along with another with the secondary solution being introduced to the flow as a result of the pump mechanism or a siphon mechanism based upon the flow of a fluid that is the primary solution. Optionally, a rubber or other suitable tube or hose may be connected between the wand and the tip/connecting point to the pump or fluid delivery device. The same device or its components could be incorporated into other devices such as water bottles or syringe ends.

An irrigation system including a reservoir with an inlet adapted to guide liquid into the reservoir, the inlet defining a closure for closing the inlet, an insertion member defining an insertion end sized for insertion into a body cavity of a human being, the insertion member defining at least one opening, and a liquid tube fluidly connecting the reservoir with the insertion member, at least one of the reservoir and the insertion member being permanently fastened to the liquid tube and further including an electrical pump adapted to pump liquid from the reservoir and out through the at least one opening of the insertion member, the electrical pump adapted to be separable from the system.

Provided is a method of cleaning a body cavity using a device by coupling a distal end portion of a first cannula to the housing such that a lumen is in fluid communication with the first portion of the inner volume, the first cannula coupled to a vacuum source, then coupling a distal end portion of a second cannula to the housing such that a lumen is in fluid communication with the second portion of the inner volume, the second cannula being coupled to a fluid source, inserting a portion of the housing into a body cavity, conveying a fluid from the fluid source to the body cavity via the lumen of the second cannula, and withdrawing the fluid from the body cavity into the vacuum source concurrently with the conveying the fluid, via the lumen of at least the first cannula.

An apparatus for cleansing wounds in which irrigant fluid from a reservoir connected to a conformable wound dressing and wound exudate from the dressing are recirculated by a device for moving fluid through a flow path which passes through the dressing and a means for fluid cleansing and back to the dressing. The cleansing means (which may be a single-phase, e.g. microfiltration, system or a two-phase, e.g. dialytic system) removes materials deleterious to wound healing, and the cleansed fluid, still containing materials that are beneficial in promoting wound healing, is returned to the wound bed. The dressing and a method of treatment using the apparatus.