Patent ID: 8382720

Claim:
A catheter for connecting an administering device to an administering needle to administer a medium, the catheter comprising: a longitudinally extending, continuous catheter wall defining an opening through which the medium is conveyed to the needle from the device, said wall having a number of free flow zones in which the medium flows freely within the catheter and a self-blocking zone connecting, in a flow direction of the catheter, a distal end of one free flow zone with a proximal end of a next free flow zone, wherein the catheter in the self-blocking zone is wider in cross-section than in the free flow zones, and wherein in the self-blocking zone at least one partial piece of an inner wall of the catheter wall in the circumferential direction abuts at least one other partial piece of the inner wall to block a flow of the medium through the self-blocking zone, wherein the partial pieces of the inner wall are separated when the medium exhibits a pressure above a predetermined blocking pressure, thereby permitting the flow, and automatically return to abut one another when the pressure exhibited by the medium is below the predetermined blocking pressure.