An improved dual mode peristaltic device is provided for infusing I.V. solutions to a patient through an I.V. tube. In a first mode of operation, the device functions as a peristaltic pump and in the second mode of operation it functions like a controller. Included in the device and associated with the I.V. tube is a pressure sensing strain gauge assembly that monitors dimensional changes in the outer diameter of the I.V. tube as an indication of fluid pressure changes in the tube. The strain gauge assembly is positioned relative to the device's peristaltic means to alternately monitor fluid pressure in a patent I.V. tube upstream and downstream from the gauge assembly. A pair of stationary fingers surround the strain gauge assembly to isolate it from the pulsitile nature of the peristaltic action of the device. In the first mode (pump mode), the device is programmed to alarm and cease operation when fluid pressure downstream from the gauge assembly reaches a preselected value. In the second mode (controller mode), the device is programmed to alarm and cease operation when there is no differential between fluid pressure upstream and downstream from the gauge assembly.
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