A pump for inducing flow within a vascular system comprises a cannula having a first configuration for deployment within the vascular system and a second configuration for directing the fluid flow within the vascular system, where the second configuration has a greater diameter than the first configuration. A first of said sealing members includes a magnetizable float member that further functions to automatically shut-off the fluid dispensing procedure before the receiving receptacle overflows, thus avoiding a problem with unwanted spillage. The main PLL is a typical PLL for generating a main oscillation clock. A selection of an advertising order is received from the user. In particular a method for detecting the hybridization between a probe polynucleotide and a target polynucleotide by using a microarray is presented.