A hole cleaning device 100 includes a housing having a porous region to communicate cuttings from a bore hole to the interior of the housing. A Venturi-effect pump creates a suction to draw cuttings from the hole into the housing. An outlet pipe coupled to the Venturi pump transports the cuttings out...http://www.google.co.uk/patents/US5269384?utm_source=gb-gplus-sharePatent US5269384 - Method and apparatus for cleaning a bore hole
