Ambulatory fluid drainage and collection device

A valve assembly for controlled drainage or delivery of a fluid from or to a patient, the valve assembly comprising:

• a diaphragm disposed in a diaphragm chamber and dividing the diaphragm chamber into a first chamber cavity and a second chamber cavity, the diaphragm being deflectable toward a first wall of the diaphragm chamber to contract the first chamber cavity and expand the second chamber cavity, and oppositely toward a second wall of the diaphragm chamber to contract the second chamber cavity and expand the first chamber cavity;
• a body having a central chamber, first and second upper connecting passages fluidly connecting the central chamber to an outlet of the body, third and fourth upper connecting passages fluidly connecting the central chamber to an inlet of the body, first and fourth lower connecting passages fluidly connecting the central chamber to a first port of the body, second and third lower connecting passages fluidly connecting the central chamber to a second port of the body, the first port fluidly connected to first chamber cavity and the second port fluidly connected to the second chamber cavity;
• and
• a plunger disposed in the central chamber and translatable within the central chamber between:
• a first actuation state that establishes fluid communication between the first upper connecting passage and the first lower connecting passage, and separately between the third upper connecting passage and the third lower connecting passage, and
• a second actuation state that establishes fluid communication between the second upper connecting passage and the second lower connecting passage, and separately between the fourth upper connecting passage and the fourth lower connecting passage,
• wherein said first chamber cavity and said second chamber cavity are fluidically isolated from one another in all actuation states of said plunger.