Figure 1.

(A) Position of the saline‐filled catheter for measurements of wound bed pressure during negative pressure wound therapy (NPWT). (B) Experimental set‐up for laser Doppler velocimetry measurements of wound edge microvascular blood flow during NPWT. The laser Doppler filament probes are inserted 0·5, 2·5 and 5 cm into the edge of the wound and the laser Doppler velocimetry unit is connected to a computer in which the data are stored. (C) Measurement of wound contraction during NPWT in a wound on the pig's back. The lines indicate the diameters of the wound, which were measured before the application of negative pressure, immediately after negative pressure was applied (0 hours), every 24 hours during NPWT and after NPWT was discontinued. The wound surface area was calculated from the measured diameters.