A negative pressure wound therapy apparatus can include a source of negative pressure configured to aspirate fluid from a wound covered by a wound dressing, a first pressure sensor configured to measure pressure downstream of the source of negative pressure, and a controller configured to, in response to a determination that pressure measured by the first pressure sensor satisfies a threshold indicative of a first blockage downstream of the source of negative pressure, provide an indication of the first blockage. The system can further include a second pressure sensor configured to measure pressure upstream of the source of negative pressure and the controller can be further configured to, in response to a determination that pressure measured by the second pressure sensor satisfies a threshold indicative of a second blockage upstream of the source of negative pressure, provide an indication of the second blockage.

A system or apparatus including a dressing, a dressing interface, and a humidity sensor may be suitable for use with systems and methods for treating a tissue site. Embodiments of the apparatus are provided for treating a tissue site with reduced pressure provided by a source of reduced pressure. The dressing may include abase layer, a sealing member disposed proximate the base layer to define an enclosure providing a sealed space over the tissue site, and an absorbent member disposed within the enclosure. The dressing interface may comprise a reduced-pressure port configured to be coupled to the source of reduced pressure and a therapy port covered by a hydrophobic filter defining a reduced-pressure pathway between the hydrophobic filter and the source of reduced pressure. The humidity sensor may comprise a sensing portion fluidly coupled to the reduced-pressure pathway and an output for providing a humidity signal that indicates the amount of fluid extracted from the tissue site and stored by the absorbent member. Other dressings, systems, and methods are disclosed.

One implementation of the present disclosure is a negative pressure wound therapy (NPWT) system, according to some embodiments. In some embodiments, the system includes an instillation system configured to provide instillation fluid to a wound site, and a controller. In some embodiments, the wound site includes a wound and a wound dressing. In some embodiments, the controller is configured to provide a first quantity of instillation fluid for a first instillation cycle. In some embodiments, the controller is configured to determine a second quantity of instillation fluid for a second instillation cycle based on the first quantity and a reduction factor. In some embodiments, the second quantity of instillation fluid is less than the first quantity of instillation fluid. In some embodiments, the controller is configured to adjust an operation of the instillation system to provide the second quantity of instillation fluid to the wound site.

In some illustrative examples, a bridge suitable for treating a tissue site may include a bridge sealing member and one or more bridge wicking layers. The bridge sealing member may extend along a length of the bridge, and may define an internal passageway in fluid communication between a receiving end of the bridge and a transmitting end of the bridge. The one or more bridge wicking layers may be disposed within the internal passageway of the bridge sealing member. Other apparatus, systems, and methods are disclosed.

A composite wound dressing apparatus promotes healing of a wound via the use of a micropump system housed within or above a wound dressing member. The micropump system includes a miniature pump that applies a subatmospheric pressure to the wound to effectively draw wound fluid or exudate away from the wound bed without the need for a cumbersome external vacuum source. Hence, the wound dressing and micropump system is portable which allows the patient mobility that is unavailable when an external vacuum source is used. The patient does not need to be constrained for any period of time while exudate is being removed from the wound.

A system can include excitation pads that can apply an excitation signal to tissue of a patient. The excitation pads can be connected to an electronic circuit that communicates the excitation signal to the excitation pads. The system can include a measurement sensor that can measure voltage of the tissue. The system can include a controller that can determine impedance of the tissue. The controller can be in communication with the excitation pads, the electronic circuit, and the measurement sensor. The controller can generate the excitation signal. The controller can obtain a current measurement of the excitation signal after it has been communicated through at least a portion of the electronic circuit. The current measurement can correspond to the excitation signal before it is applied to the tissue. The controller can determine impedance of the tissue based on the voltage measurement and the current measurement of the excitation signal.

A negative pressure treatment arrangement comprising a multi-layered drainage film, wherein a drainage space is formed between two layers of the drainage film, a first film layer on the wound side delimiting the drainage space comprising a first opening arrangement facilitating the admission of fluids or gases to the drainage space and a second film layer facing away from the wound that also delimits the drainage space comprising a second opening arrangement designed to discharge fluids and/or gases from the drainage space, and also comprising a fluid-tight fixing film that can be used to fix the drainage film to the skin surrounding a wound and to cover at least one area of the second opening arrangement.

Negative pressure wound therapy apparatuses and dressings, and systems and methods for operating such apparatuses for use with dressings are disclosed. In some embodiments, controlling the delivery of therapy can be based on monitoring and detecting various operating conditions. An apparatus can have a controller configured to monitor a duty cycle of a source of negative pressure. Based on the monitored duty cycle, the controller can determine whether a leak is present and provide an indication to a user. The controller can determine a duty cycle threshold in order to achieve an optimal or near optimal balance between an uninterrupted delivery of therapy, avoidance inconveniencing a user, conserving power, achieving optimal or near optimal efficiency, and/or limiting vibrational noise. In some embodiments, the duty cycle threshold is determined based at least in part on a capacity of a power source and an operational time of the apparatus.

A fluid drainage device which includes a fluid-receiving volume, a cover which is movable between a first limiting position at which an inlet port is in fluid communication with the volume and a second limiting position at which an outlet port is in fluid communication with the volume, a piston which is movable inside the volume between a first position and a second position, a handle which is moveable in a first direction to cause the piston to move to the first position and to store energy in a spring so that, when the cover is in the first limiting position the piston is moveable by energy released from the spring to reduce pressure in the volume, allowing fluid flow through the inlet port, and wherein movement of the handle in a second direction causes the piston to move to the second position thereby expelling fluid from the volume.

A negative pressure wound treatment system comprising a bandage portion and a negative pressure portion. The bandage portion includes a dressing portion in contact with a wound and a sealing layer positioned in contact with the dressing portion. The sealing layer includes an adhesive creating a seal around the wound. The negative pressure portion is in fluid communication with the bandage portion and includes a first valve and a second valve. The first valve is in fluid communication with the bandage portion and the negative pressure portion. The second valve is in fluid communication with the negative pressure portion and the surrounding environment. The negative pressure wound treatment system is configured to provide negative pressure to an area sealed by the bandage portion upon the actuation of the negative pressure portion. The negative pressure portion is configured to be actuated by compressing the negative pressure portion while walking.