Catheter valve

A catheter valve comprising a housing engaging at least a portion of a tubular member, said tubular member having distal and proximal open ends defining a flow-through passage therebetween, said tubular member further having a proximal portion of a deformable and therefore twistable structure and a distal portion of a more rigid structure, said proximal portion being partially and circumferencially attached to an inner surface of said housing, wherein dimensions of said housing, of said proximal portion and of said distal portion are selected such that when said distal portion is rotated, said proximal portion is twisted so as to block passage of fluid through said tubular member and therefore through the catheter valve and said distal portion is frictionally engaged by an inner surface of said housing thus preventing self untwisting of said proximal portion, wherein pulling of said distal portion in a direction away from said housing disengages said distal portion from said inner surface of said housing thereby allowing self untwisting of said proximal portion and passage of fluid through said tubular member.