Apparatus for irrigation with negative pressure

An irrigation valve, comprising:

• a jaw configured to receive a tube;
• a first bar having a first end and a second end,
• a second bar coupled to the second end of the first bar;
• a piston coupled to the jaw and the first bar on a same side of the first bar as the second bar;
• the piston operable to move the jaw in response to negative pressure;
• and
• wherein the piston comprises:
• a chamber configured to be fluidly coupled to a negative-pressure source,
• a piston head disposed in the chamber, and
• a biasing member disposed in the chamber and operable to bias the piston head to a first position;
• and
• wherein the piston is operable to cycle the jaw between a high-flow position and a low-flow position to control fluid flow through the tube.

A method for irrigating a tissue site, the method comprising:

• placing a tissue interface adjacent to the tissue site;
• covering the tissue interface and the tissue site to form a sealed space;
• fluidly coupling an irrigation valve to the sealed space, the irrigation valve comprising:
• a first bar having a first end and a second end,
• a second bar coupled to the second end of the first bar, and
• a piston coupled to the first bar on a same side of the first bar as the second bar, the piston having a chamber;
• fluidly coupling a fluid source to the irrigation valve;
• fluidly coupling a negative-pressure source to the sealed space and the chamber of the irrigation valve;
• operating the negative-pressure source to supply negative-pressure to the sealed space and the irrigation valve;
• and
• restricting a fluid path through the irrigation valve in response to a supply of negative pressure.