Wound Necrosis in Lower Extremity Surgery

The SPY Intra-operative Angiography Fluorescent Imaging System consists of an imaging head equipped with a charged coupled device (CCD) camera, a laser light source and a distance sensor. The imaging head is attached to an articulating arm on a mobile cart containing the central processing unit, keyboard, monitor, and mouse. SPY is used in tandem with indocyanine green (ICG), a water-soluble tricarbocyanine dye. Once the camera is in place, 5 cc of diluted ICG is pushed through an IV line and is flushed immediately; simultaneously the room lights must be dimmed. Perfusion images will be recorded then the SPY system will be removed from the operating room.