A wound-treatment system comprising: a wound dressing comprising: a wound insert comprising a hydrophobic foam coated with a hydrophilic material and configured to be disposed adjacent a wound, and; a drape configured to cover the wound insert and the wound; a fluid source configured to be fluidly coupled to the wound dressing; a vacuum source configured to be fluidly coupled to the wound dressing; and a check valve assembly comprising: a first member having a first connection configured to be fluidly coupled to the wound dressing, a first lumen, and a second annular lumen disposed around the first lumen, wherein the first lumen and the second annular lumen extend from the first connection through the first member, a second member having a second connection configured to be fluidly coupled to the vacuum source, a first lumen, and a second annular lumen disposed around the first lumen, wherein the first lumen and the second annular lumen extend from the second connection through the second member, a check valve disposed in a passageway formed between the first lumens, and wherein the second annular lumens are fluidly coupled so that they are not in fluid communication with the first lumens and the passageway. a wound dressing comprising: a wound insert comprising a hydrophobic foam coated with a hydrophilic material and configured to be disposed adjacent a wound, and; a drape configured to cover the wound insert and the wound; a wound insert comprising a hydrophobic foam coated with a hydrophilic material and configured to be disposed adjacent a wound, and; a drape configured to cover the wound insert and the wound; a fluid source configured to be fluidly coupled to the wound dressing; a vacuum source configured to be fluidly coupled to the wound dressing; and a check valve assembly comprising: a first member having a first connection configured to be fluidly coupled to the wound dressing, a first lumen, and a second annular lumen disposed around the first lumen, wherein the first lumen and the second annular lumen extend from the first connection through the first member, a second member having a second connection configured to be fluidly coupled to the vacuum source, a first lumen, and a second annular lumen disposed around the first lumen, wherein the first lumen and the second annular lumen extend from the second connection through the second member, a check valve disposed in a passageway formed between the first lumens, and wherein the second annular lumens are fluidly coupled so that they are not in fluid communication with the first lumens and the passageway. a first member having a first connection configured to be fluidly coupled to the wound dressing, a first lumen, and a second annular lumen disposed around the first lumen, wherein the first lumen and the second annular lumen extend from the first connection through the first member, a second member having a second connection configured to be fluidly coupled to the vacuum source, a first lumen, and a second annular lumen disposed around the first lumen, wherein the first lumen and the second annular lumen extend from the second connection through the second member, a check valve disposed in a passageway formed between the first lumens, and wherein the second annular lumens are fluidly coupled so that they are not in fluid communication with the first lumens and the passageway.