Embodiments disclosed herein are directed to the treatment of wounds using negative pressure. Some embodiments disclosed herein provide for a foam pad, which may be suitable for use in abdominal wound sites, and which may be sized in a dimensionally-independent manner. Additional embodiments provide for a wound contact layer, as well as a system for the treatment of abdominal wounds.

In some embodiments, a wound therapy apparatus includes a wound dressing configured to be positioned over a wound, the wound dressing including a substantially stretchable wound contact layer supporting a plurality of electronic components and a plurality of electronic connections that connect at least some of the plurality of the electronic components. The wound contact layer can include a first plurality of flocked fibers positioned on a wound facing side of the wound contact layer, the first plurality of flocked fibers including soft material configured to cushion the wound contact layer when the wound dressing is positioned over the wound. The wound contact layer can include a second plurality of flocked fibers positioned on a non-wound facing side opposite the wound facing side.

The present disclosure relates generally to wound dressing compositions that detect nitric oxide production in a wound upon application. The wound dressing composition comprises a first layer comprising an absorbent layer, a second layer comprising a reaction pad, a third layer comprising a transparent backing film, and optionally a fourth layer comprising a wicking layer. In the wound dressing composition, the second layer comprises a reaction pad of a dried reaction mixture to detect the presence of nitric oxide in a wound. The wound dressing composition can be a visual indicator of the presence of nitric oxide in a wound; a visual indicator of the wounds healing status.