The present invention relates to me methods for minimizing spasticity in blood vessels during transplantation and more particularly for minimizing spasticity in arterial transplants, for both ex-vivo and in-vivo procedures. The shelf includes a skin that defines a support surface of the shelf, and a skeleton structure to which the skin is attached. In one embodiment, the cover is configured to fit a mobile communications device having a trapezoidal profile, whereby front and back face portions clasp around the front and back of the phone. A portion of the larger particles leaves the major flow and merges with the minor flow due to particle momentum, thus increasing the large-particle concentration of the minor flow. A second inserting port is provided at a side of the second receiving space coupled to the front end of the insulating body.