The shoes of the roller pinch the tube and move the fluid in the direction of rotation of the roller. The fluid passes through a flexible tube within the pump and it is pushed by a roller moving the fluid forward as shown in the image above. Peristaltic pumps are positive displacement pumps that insulate the fluid dispensed with the pump mechanism and external environment. Unlike other precision pumps, peristaltic pumps do not require valves to control the direction of fluid flow. The most commonly observed use of peristaltic pumps is in aquariums to pump fresh air into the water tank. It is now used in many industry verticals including medical devices, laboratories, manufacturing, and landscaping. Later the same technology was used in other medical devices like cardiopulmonary bypass systems. Michael DeBakey designed a pump for blood transfusions. Bradley and Rufus Porter, and subsequent improvements were made over the next century. The peristaltic pump was patented in 1855 by J.D. This is a potential avenue for contamination of the fluid and can pose a significant issue when fluid with a sensitive nature is dispensed. But an inherent problem with them is that the mechanism of the pump is in direct contact with the fluid to be pumped. Piston pumps and diaphragm pumps can be used for high-precision fluid handling.
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