Patent ID: 7704057

Claim:
A peristaltic pump ( 100 ), designed to operate with a deformable flexible pump body tubing ( 500 ), comprising: a shell ( 200 ); a bearing surface ( 400 ) forming a casing with said shell; and a plurality of cylindrical rollers ( 321 , 322 , 323 ) housed inside said casing, said rollers being rotatable about a main axis (A) and able to compress said tubing at least one point on a surface of said bearing surface facing the inside of said casing, called an inner surface, wherein said bearing surface ( 400 ) comprises an intermediate deformable portion ( 401 ) with an intermediate inner surface ( 405 ) having the shape of a cylinder whose axis (A′) coincides with said main axis, and first and second rigid side arms ( 403 , 404 ) on either side of said deformable intermediate portion, first and second free ends (E, F) of said first and second rigid side arms comprising, respectively, first and second guide means ( 413 , 414 ), and in that said shell comprises upstream and downstream tracks ( 251 , 252 ) on which said first and second guide means can slide in an assembled position of said pump, said upstream and downstream tracks comprising chamfered lateral surfaces of first and second main walls of said shell and respective predefined paths for limiting the displacement of said first and second free ends of the first and second rigid side arms so as to deform said deformable intermediate portion so that a radius of said intermediate inner surface is modified while leaving said axis of said intermediate inner surface in coincidence with said main axis, so that said peristaltic pump adapts automatically to a tubing having variable physical and geometric properties.