This is the technique that allows closing soft tissue defects by means of vacuum asisted extension, However, it is usually written as "VAC" (typo?).

Seventy-three consecutive patients with 79 wound infections after undergoing spine surgery were studied (6 of them had recurrence of infection). All patients were taken to the operating room for irrigation and debridement under general anesthesia followed by placement of the VAC with subsequent delayed closure of the wound.

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Note added at 49 mins (2009-12-17 20:22:23 GMT)
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The vacuum-assisted closure (VAC, KCI Medical, San Antonio, Tex.) system may offer an alternative to treating these difficult wounds. The VAC technique uses continuous-cell foam dressing, which is attached to a subatmospheric pressure device. Although the mechanisms of action are still being fully delineated, subatmospheric pressure decreases bacteria count, removes serous fluid, reduces tissue edema, improves blood flow, and maximizes granulation tissue formation.1,2 Although this technique has been effective in a large number of patients with a variety of wounds, vascularized soft tissue remains the preferable treatment choice in wounds with exposed hardware