A system and method reduce or eliminate the step-contouring are provided because many types of compression algorithms introduce a step-contoured artifact for images and video with slow gradients. The membrane can include a tubular portion configured to transition between an open configuration in which the tubular portion is configured to receive a guidewire and a closed configuration in which the tubular portion is configured to occlude blood flow. At least one of the pipes is produced at least in part from a non cross-linked polymer material and is distinguished in that the polymer material of the at least one layer for the pipes has a FNCT value according to ISO 16770 of at least 3000 hours.