Warner-lambert Company

Imed Corporation

Fisher Scientific Group Inc.

Ted C Bloomquist

Raymond E Cannon

A linear peristaltic device for pumping medical solutions to a patient comprises a hinged attachment between the peristaltic drive mechanism and its associated platen. An IV tube, through which the medical solutions are to be pumped is received and held between the peristaltic drive mechanism and the platen during operation of the device. The device also includes a compliant means which normally urges the peristaltic mechanism toward the platen but which yields, as necessary, to limit the force the peristaltic mechanism can exert against the tube.

Peristaltic pump with cam action compensator

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.

Dual mode I.V. infusion device with distal sensor

A 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. 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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San Diego, CA, United States of America

Ted C Bloomquist