A change in the internal pressure of the fluid-infusion tube of a peristaltic fluid-infusion pump due to occlusion in the fluid-infusion tube is detected through a change in the diameter of the fluid-infusion tube. The occlusion is detected by detection of the change in the distance between the opposite...http://www.google.com.au/patents/US4373525?utm_source=gb-gplus-sharePatent US4373525 - Method and apparatus for detecting occlusion in fluid-infusion tube of peristaltic type fluid-infusion pump
