A wound monitoring and/or therapy system can include a substantially stretchable substrate supporting a plurality of electronic components, including sensors, and a plurality of electronic connections that connect at least some of the electronic components. The electronic components can also include a circuit board supporting at least one controller configured to control at least some of the sensors, the circuit board configured to operate without failure when the substrate is flexed as a result of strain. A calibration track can be positioned on the substrate and connected to a monitoring circuit configured to measure a change in resistance of the calibration track indicative of resistance change of at least some of the plurality of electronic connections. The system can include a controller with a circuit board supporting a plurality of electrical components and an antenna configured to communicate with the substrate, the antenna at least partially enclosing the circuit board.

A negative pressure wound therapy device includes a piezoelectric pump, a state detector configured to detect a state of the pump, and a control circuit configured to transmit a first control signal for a first period having a first RMS voltage greater than or equal to a threshold voltage at which driving the pump for a second period greater than the first period can cause the pump to emit sound at a magnitude greater than a sound threshold; receive a first indication of the state; determine if the pump is in a leak condition; transmit, responsive to the pump not being in the leak condition, a second control signal having a second RMS voltage less than the first RMS voltage; and transmit, responsive to the pump being in the leak condition, a third control signal having a third RMS voltage greater than the second RMS voltage.

A system for negative pressure and hypoxic tissue therapy including a chemical pump assembly, a dressing to cover a tissue site, a plurality of hoses, and a cover layer to cover a portion of the dressing. Each hose is configured to fluidly connect the dressing to the assembly. Oxygen flows from the dressing to a reactor in the assembly where the oxygen is consumed by the reactor. The hoses have different cross-sectional areas and selectable lengths, and these can be selected to provide a desired amount of oxygen around the tissue site. The cover layer has less permeability to air that does the dressing, nd can be used to cover a portion of the dressing to inhibit the permeation of air through the dressing and thus provide the desired amount of oxygen around the tissue site.

A dressing may comprise a manifold having a first planar surface and a second planar surface opposite the first planar surface, and a first layer adjacent to the first planar surface and a second layer adjacent to the second planar surface. The first layer and the second layer may be laminated to the first planar surface and the second planar surface, respectively. Pressure-responsive fluid restrictions through at least one of the first layer and the second layer may be adjacent to the manifold. The first layer and the second layer may also form a sleeve or an envelope around the manifold in some embodiments. At least one of the first layer and the second layer may be configured to be disposed between the manifold and a tissue site in use. In some examples, the dressing may have a smooth or matte surface configured to contact a tissue site.

Embodiments of negative pressure wound therapy systems and methods for operating the systems are disclosed. In one embodiment, a negative pressure wound therapy apparatus can include a wound dressing, a negative pressure source, and a controller. The negative pressure source can provide negative pressure via a fluid flow path to the wound dressing. The controller can monitor a rate of fluid removal from the wound, wirelessly communicate the rate of fluid removal to a remote device, and output an indication when the rate of fluid removal meets a threshold.

A micro-negative pressure foam dressing and a manufacturing method thereof is disclosed, the dressing comprises a exothermic agent layer, an isolation component covering on the exothermic agent layer, an elastic memory piece disposed under the exothermic agent layer, a liquid absorbing negative pressure pad disposed under the elastic memory piece, a contact layer disposed under the liquid absorbing negative pressure pad, a sealing film disposed between the liquid absorbing negative pressure pad and the contact layer, and a bottom release film disposed under the contact layer; and in this invention, heat generated by a exothermic agent layer causes an elastic memory piece to expand downward to compress a foam layer, and after the heat dissipates completely, a micro-negative pressure is generated since a sealed environment is formed by a sealing film, a contact layer and a wound surface without a need for the VSD negative pressure technology.

Vacuum dressings with a guide tube are provided for implantable medical devices that inhibit infection associated with in-dwelling devices while encouraging healing of the incision around the device. The vacuum dressings mitigate pooling of fluids that harbor bacteria from between the outer diameter of an inserted implantable medical device and the inner diameter of a guide tube and also in the cylindrical gap, between the outer diameter of an inserted implantable medical device and the inner wall of the subcutaneous tunnel, which remains in fluid communication with skin microflora. Implantable medical devices may also illustratively include a variety of catheters, such as venous access, peritoneal dialysis, and other indwelling venous access catheters that require skin penetration; cannulas; Steinman pins; Kirschner wires; and cardiac assist device lines.

Embodiments of negative pressure wound therapy systems and methods for operating the systems are disclosed. In some embodiments, a system includes a pump assembly and a wound dressing configured to be positioned over a wound. The pump assembly and the wound dressing can be fluidically connected to facilitate delivery of negative pressure to a wound via a fluid flow path. The system can be configured to efficiently deliver negative pressure and to detect and indicate presence of conditions, such as a blockage in a fluid flow path. Monitoring of the conditions can be performed by detecting a level of activity of a pump of the pump assembly.

A negative pressure wound therapy bandage for applying negative pressure to a wound, the bandage comprising: a membrane configured for disposition over a wound so as to form a wound chamber between the membrane and the wound, the membrane comprising a wound-side surface, an atmosphere-side surface, and an opening extending through the membrane from the wound-side surface to the atmosphere-side surface; and a pump assembly carried by the membrane, the pump assembly comprising: a pump body comprising a wall structure disposed about a pump chamber, wherein at least a portion of the wall structure is resilient, and further wherein the pump chamber communicates with the wound chamber through the opening formed in the membrane; and an atmosphere-side passageway extending through the wall structure so as to fluidically connect the pump chamber to the atmosphere.

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.