A medical infusion pump (10) using a pump chamber cassette (86) has a housing (20,22) defining a pump chamber cassette receptacle (84) and a pump driving mechanism (250) for propelling liquid through the pump chamber cassette. A door (50) holds the pump chamber cassette (86) within the cassette receptacle...http://www.google.com.au/patents/US5482446?utm_source=gb-gplus-sharePatent US5482446 - Ambulatory infusion pump
