A small suction pump that may be implanted in test animals to draw biological fluid samples is disclosed. The pump, before it is activated, consists of an outer, impermeable expansible housing, an inner, expanded elastomeric fluid collection container housed within the housing, a port extending from...http://www.google.es/patents/US4299222?utm_source=gb-gplus-sharePatente US4299222 - Self-contained suction pump
