Patent ID: 6203296
Filing Date: 2001-03-20
Classification: A61M,F04B

Abstract:
A miniature peristaltic pump comprising:a rotor (109) equipped with three rotating rollers (110) each roller comprising a substantially cylindrical body (127) and a shaft (126) on which said body is rotatably mounted, wherein the ends of the shafts of the rollers fit into oblong openings (128) arranged radially in the rotor,a means for driving (111, 112) said rotor,a means for controlling (113) said driving means,a support piece equipped with a rounded-off portion (308) arranged in a substantially concentric manner to the rotor and against which, during operation, said rollers compress a flexible tubing (202) connected to a solution reservoir (201) pushing the solution towards the outside anda means for automatically compensating, by means of springs, the gaps in position between the rollers and said support piece,wherein said means for automatically compensating comprises two springs (129) arranged at the level of the respective ends of said shafts and comprise a central part (130) concentric to the rotor and three curved spring arms (132), one for each roller, of which one end is connected to said central part and the other end is supported on the corresponding end of a roller shaft for pushing it towards the outside and towards the tubing, whereby each roller exerts a substantially constant compression force on the tubing.