As tube-phragm pump includes a pump head (1) and an electromagnetic driver (2). The pump head (1) includes a cylinder (21) having a cylindrical space formed therein, and a cylindrical flexible tube (22) arranged coaxially within the cylindrical space of the cylinder (21). The outer space between the...http://www.google.es/patents/US6302660?utm_source=gb-gplus-sharePatente US6302660 - Tube pump with flexible tube diaphragm
