Negative pressure is a procedure in which a “vacuum dressing” is used to enhance wound healing by using a sealed foam, gauze or drain dressing, attached to a pump which create the vacuum in the wound area. There is a lower atmospheric pressure in wound.
Scientifically described as Macro- and Microstrain. Macrostrain is the visible contraction of the gauze or foam. Microstrain is the microdeformation at the cell level which leads to stretching of tissue cells.