B. Braun Medical Inc.

Harry C Copp

Roger J Hill

James H Monti, Jr

David J Harrison

Roberta Stavely

Gary Lindemann

Joseph A Oliver

Joe C Crittendon

A linear peristaltic pump of the type for removable engagement of a portion of a flexible tubing and having a plurality of sequentially actuated pumping elements which act along the engaged portion of the flexible tubing, with the pumping elements reciprocated in a first direction to collapse adjacent segments of the tubing and then in a second direction to release the adjacent segments of the tubing, each pumping element having a flat pumping surface reciprocated in a sequence so that fluid in the flexible tubing is moved along the engaged portion of the tubing. The linear peristaltic pump is provided with a plurality of opposed pairs of pivotable reshaping fingers, with each pair of the reshaping fingers interposed adjacent to one of the pumping elements in sequence along the engaged portion of the flexible tubing. A finger drive and follower mechanism is formed by and engaged between each of the plurality of pairs of reshaping fingers and the adjacent ones of the pumping elements for actuating the reshaping fingers into reshaping engagement with the flexible tubing upon release thereof by the adjacent one of the pumping elements.

Linear peristaltic pump with reshaping fingers interdigitated with pumping elements

A rotation control for a device to be rotated includes a variable speed DC motor having a constant rotational speed upon receiving a selected fixed voltage electrical input power from an adjustable electrical input power supply connected to the motor for supplying the selected fixed voltage. A switch circuit is connected between the motor and the power supply activatable in response to a first electrical signal to turn the motor 'on' and activatable in response to a second electrical signal to turn the motor 'off'. A selectable frequency, regular interval electrical signal device is connected to the switch circuit to provide electrical signals to activate the switch circuit to turn the motor 'on' at regular intervals. An encoder wheel is coupled to the device to be rotated and to the motor for rotation of the timing disk at a speed proportional to the constant rotational speed of the motor. The timing disk has a plurality of openings around the disk with predetermined spacing there between. The spacing corresponds to a desired amount of device rotation. A light sensor is operatively positioned adjacent to the encoder wheel for detecting the spaced openings and connected to the switch circuit to provide the electrical signal to turn the motor off each time a next one of the openings is detected by the sensor thereby allowing the device to traverse the desired amount of device rotation during each regular interval that the motor is turned on.

Volumetric flow equalizing drive control wheel

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Carrollton, TX, United States of America

Harry C Copp