Apparatus for negative-pressure therapy and irrigation

A system for treating a tissue site, comprising:

• a manifold configured to contact the tissue site;
• a drape configured to be positioned over the manifold to form a sealed space;
• a first fluid interface configured to be fluidly coupled to the sealed space and a fluid source;
• a second fluid interface configured to be fluidly coupled to the sealed space and a negative pressure source;
• and
• an irrigation valve fluidly coupled to the first fluid interface, the irrigation valve comprising:
• a housing having an end wall, a conical base and a variable volume chamber;
• a fluid inlet coupled to the end wall and configured to be fluidly coupled to the fluid source;
• a fluid outlet coupled to the conical base and configured to be coupled to the negative pressure source;
• a plunger disposed in the housing, the plunger having a head, a rod having a first end coupled to the head and a second end coupled to a valve member;
• a fluid passage disposed inside the plunger and extending through the plunger from the head to the valve member of the plunger, the fluid passage fluidly coupled to the fluid inlet and the fluid outlet;
• and
• a spring configured to at least partially surround the rod and bias the plunger.