A peristaltic pump has facing half shells defining a pumping cavity and circular tube access grooves entering the cavity. Rotor apparatus includes a cylinder having concave, semi-spherical end surfaces rotatably supporting roller balls therein. The pumping cavity has a tube supporting substantially semi-annular,...http://www.google.com.au/patents/US4417856?utm_source=gb-gplus-sharePatent US4417856 - Peristaltic pump
