Continuous sample delivery peristaltic pump

A system, comprising:

• a first disk that is substantially circular, has a nominal radius, and includes a first recess in a periphery of the first disk, the first recess configured to receive a first portion of a tubing for conveying fluid;
• a second disk that is substantially circular, has substantially the nominal radius, and includes a second recess in a periphery of the second disk, the second recess configured to receive a second portion of the tubing;
• one or more first rollers that are configured to orbit around the periphery of the first disk such that each first roller travels at the same angular speed as any other first roller at any given point in time, and that are configured to press into contact with the periphery of the first disk, the first portion of the tubing, or the periphery of the first disk and the first portion of the tubing;
• a first motor configured to cause the one or more first rollers to orbit the periphery of the first disk at two or more angular speeds;
• a plurality of second rollers that are configured to orbit around the periphery of the second disk and configured to press into contact with the periphery of the second disk, the second portion of the tubing, or the periphery of the second disk and the second portion of the tubing;
• a second motor configured to cause the plurality of second rollers to orbit the periphery of the second disk at a constant angular speed;
• and
• a controller for controlling the system, the controller comprising control logic for:
• controlling the first motor to cause the one or more first rollers to orbit around the periphery of the first disk at a first angular speed and a second angular speed that is less than the first angular speed,
• controlling the second motor to cause the plurality of second rollers to orbit around the entire periphery of the second disk at the second angular speed,
• increasing a pressure of a portion of the fluid in the tubing between one first roller of the one or more first rollers and one second roller of the plurality of second rollers by controlling the first motor to cause the one or more first rollers to orbit the first disk at the first angular speed so that the one first roller moves along and fully compresses the tubing through a first section of the periphery of the first disk, and by simultaneously controlling the second motor to cause the one second roller to orbit the second disk at the second angular speed and move along and fully compress the tubing in a first section of the periphery of the second disk, and
• moving, after increasing the pressure of the portion of the fluid, the portion of the fluid through the tubing at a constant pressure towards an output of the tubing by controlling the first motor to cause the one or more first rollers to orbit the first disk at the second angular speed while the one first roller moves along and is fully compressing the tubing in a second section of the first disk, and while the one second roller is fully compressing the tubing.