A negative pressure wound therapy system can include a negative pressure source configured to provide, via a fluid flow path, negative pressure to a wound covered by a wound dressing. The system can include a controller. The controller can be configured to periodically activate the negative pressure source to maintain negative pressure in the fluid flow path between a low negative pressure setpoint and a high negative pressure setpoint. The controller can be configured to determine a change in a volume of the wound based on a difference between a first time and a second time at which the high negative pressure setpoint has been established in the fluid flow path, the second time being subsequent to the first time. The controller can be configured to provide indication of the change in the volume of the wound.

Disclosed embodiments relate to wound therapy apparatuses and methods for use in negative pressure wound therapy (NPWT). Such wound therapy apparatuses and methods may reduce maceration during NPWT. The wound therapy apparatus may include a porous hydrophobic layer surrounded by a hydrophilic ring. The hydrophilic ring may serve to prevent passage of liquid while negative pressure is applied to the wound, but allow liquid passage to an absorbent ring when negative pressure is no longer applied. A transmission layer may also be included, underlying the absorbent layer.

This disclosure describes devices, systems, and methods related to therapy devices including pumps that are operable in multiple operating modes. An exemplary wound therapy device includes a pump configured to be worn by a user and a controller coupled to the pump and configured to transition the pump from operating in a first operating mode to operating in a second operating mode responsive to a pressure of the wound therapy device satisfying a first pressure threshold. The first operating mode is associated with a first drive voltage that is different from a second drive voltage associated with the second operating mode.

Embodiments of a canister for a negative pressure wound therapy systems and methods for operating the systems are disclosed. In some embodiments, the canister includes a receptacle for receiving wound exudate. A filter stack is interposed between the receptacle and the pump assembly and provides a fluid flow path therebetween. The flow path is more easily navigable by gas than by liquid, thereby allowing the pump assembly to apply a negative pressure to the canister without aspirating wound exudate into filters housed within the filter stack.

The present invention relates to a negative pressure wound therapy device, system and method. The negative pressure wound therapy device is connected with a dressing, and comprises a housing, a control circuit board, a pump, and an aspiration conduit. The pump generates negative pressure. The pump may comprise a voltage-actuated deformation element (such as piezoelectric vibration element) to push fluid from an aspiration end to a discharge end. The aspiration conduit has a pump end and a dressing end. The pump end is fluidly connected to the aspiration end of the pump, and the dressing end is fluidly connected to the dressing used for covering a wound. The control circuit board is disposed in the housing, controls the pump to generate the negative pressure in the aspiration conduit, and applies negative pressure to the wound covered by the dressing via the aspiration conduit.

Embodiments of apparatuses and methods for determining an emplacement of sensors in a wound dressing are disclosed. In some embodiments, a wound dressing includes a plurality of sensors configured to measure wound or patient characteristics. One or more processors are configured to receive wound or patient characteristics data as well as emplacement data. The received data can be used to determine an emplacement of the plurality of sensors, the wound dressing, or a wound. The sensors can include a set of nanosensors. The wound dressing can include pH sensitive ink which can be utilized for determining a placement of the wound dressing and determining a pH associated with the wound. The wound dressing can be used in a negative pressure wound therapy system.

Embodiments of negative pressure wound therapy systems and methods are disclosed. In one embodiment, an apparatus includes a housing, negative pressure source, circuit board, and one or more controllers. The circuit board can be supported by the housing and include a conductive pathway extending around at least part of a perimeter of a first side of the circuit board. The conductive pathway can be electrically coupled to an electrical ground for the circuit board. The one or more controllers can be mounted on the circuit board and activate and deactivate the negative pressure source.

In some embodiments, an apparatus for providing negative pressure wound therapy to multiple wounds includes a negative pressure source configured to couple via a plurality of fluid flow paths to a plurality of wound dressings. The plurality of flow paths includes a plurality of calibrated leaks. The apparatus also includes a controller configured to determine a total rate of flow in the plurality of fluid flow paths and compare the total rate of flow to a plurality of thresholds associated with the plurality of calibrated leaks to determine one or more operating conditions, such as a blockage in one or more of the plurality of flow paths. An indication of the operating condition can be provided.

A mobile negative pressure wound therapy (NPWT) device is described having an inlet to be in fluid flow connection with a wound site; a canister in fluid flow connection with the inlet for collection of liquid from the wound site; a pump in fluid flow connection with the canister for establishing a negative pressure in the canister; a pressure sensor arranged to sense a pressure in the canister; and control circuitry for controlling operation of the NPWT device. The control circuitry is configured to: initiate a test sequence for the NPWT device; acquire a first signal indicating the pressure in the canister; evaluate the first signal; when the acquired first signal indicates a pressure less negative than a predefined threshold pressure: control the pump to operate during a predefined time period; acquire a second signal after the predefined time period; proceed with the start-up test sequence; and when the acquired signal indicates a pressure more negative than the predefined threshold pressure: proceed with the start-up test sequence without controlling the pump to operate during the predefined time period.

A surgical drain system for use during and following surgery is provided. A collection reservoir is placed in fluid communication with the body of a user through a collection port. A pump creates a vacuum pressure to urge fluid into the collection reservoir. Fluid exits the collection reservoir through a drain port. A drain mechanism allows air to come into the collection reservoir through an air intake aperture and collected fluid to leave the reservoir simultaneously. The drain system can be worn beneath clothes.