Patent ID: 7874819

Claim:
A peristaltic pump comprising: a base; an occlusion bed movably mounted on said base, said occlusion bed having an occlusion surface; a rotor assembly rotatably mounted on said base and including an end plate and a plurality of rollers rotatably mounted on said end plate; a motor drivingly coupled to said rotor assembly; a tube retaining device mounted on the base and having an outer surface; and a tube positioned between said rollers and said occlusion surface and secured within said tube retaining device, wherein said tube comprises a cylindrical wall defining a hollow interior and a cylindrical outer surface, a longitudinal centerline axis and a plurality of markings applied to said outer surface, said markings comprising first and second markings extending transversely to said longitudinal centerline axis; said first and second markings are longitudinally spaced from one another by a predetermined distance; said first marking and said second marking are substantially aligned with said outer surface of said tube retaining device.