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  • Therapeutic systems designed to treat open wounds by locally applying negative pressure to the wound site. These systems typically consist of a computer-controlled vacuum pump connected to a dressing via a suction/evacuation tube; systems employing mechanically powered sources of negative pressure are also available. Vacuum pumps may be line-powered or battery-powered and reusable or single-use. The dressings usually include a foam (e.g., black polyurethane, polyvinyl alcohol) dressing with an embedded evacuation tube and a transparent film dressing that is applied over the foam package to seal the foam and the tube. These systems apply either continuous or intermittent negative pressure through the tube to the foam dressing, drawing off excess of interstitial fluids from the wound. Wound exudate is collected either in the dressing or removed via the suction/evacuation tube, which empties into a collection canister. Negative-pressure wound-therapy systems decompress the capillaries and lymphatic vessels, thus improving blood flow to the wound and reestablishing normal circulation of interstitial fluids.
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