A wound bed preparation device for delivering a fluid jet to tissue includes a handpiece having a deck height in the range of −0.0254 mm to 0.2032 mm, a channel width in the range of 0.8636 mm to 1.1684 mm, and a nozzle diameter in the range of 0.10668 mm to 0.12192 mm. The handpiece has a constant channel width over a majority of a tissue impacting section of the handpiece.
