1. The needle assembly comprising: a housing forming an inner space comprising at least one cannula having a piercing end for contact with a patient, extending from the first end of the housing and not in contact with the patient the piercing end extending from the second end of the casing, both piercing end communicate with each other in the inner space of the housing iporisty permeable member disposed in the interior of the casing, dividing it into first and second chambers having pores for passage through them of fluid from the first chamber into the second chamber and comprising an occlusive member for directing fluid flow as it passes through the porous permeable member, wherein single channel for communication between the interior of the housing and the external environment passes through the piercing end for contact with patsientom.2. Needle assembly according to Claim. 1, wherein the porous permeable member is arranged to reduce the flow of fluid therethrough by shorter paths having a smallest soprotivlenie.3. Node needle according to Claim. 1, wherein the porous permeable member is a tubular member having a first end surface, a second end surface and a central portion therebetween, and the tubular member has a longitudinal channel, covering at least a portion of said at least one cannula. 4. Needle assembly according to claim. 3, wherein the porous permeable member is arranged to direct fluid flow longitudinally away from the first end surface to the central portion or the second end surface of the porous permeable member and
