초록 ▼

A dual controller for an IV infusion system comprises a microprocessor to concurrently control the rate of infusion through two IV units. The control of the rate of infusion is provided by a stepper motor driven regulator which is selectively positionable for compressibly engaging the IV tubing. A f

A dual controller for an IV infusion system comprises a microprocessor to concurrently control the rate of infusion through two IV units. The control of the rate of infusion is provided by a stepper motor driven regulator which is selectively positionable for compressibly engaging the IV tubing. A flow sensor employs a case of infrared transparent material which mounts to a drip chamber of the infusion unit. The flow sensor provides an output pulse to the microprocessor in response to a drop of fluid in the drip chamber interrupting a light path extending from an array of light emitting diodes and a photo transistor. The light emitting diodes are pulsed between energized and non-energized states so that changes in the ambient light level do not adversely effect the sensed drop rate.

대표청구항 ▼

A flow sensor for detecting the drop rate in an associated drip chamber of an infusion system comprising: infrared light emitting means to generate an infrared light path; sensor means interposed in said light path to detect the level of light passing therein and continuously generate a first signal

A flow sensor for detecting the drop rate in an associated drip chamber of an infusion system comprising: infrared light emitting means to generate an infrared light path; sensor means interposed in said light path to detect the level of light passing therein and continuously generate a first signal indicative thereof; pulsing means to periodically energize said light emitting means to produce a series of energized and non-energized states; difference means to determine the difference between said first signal when said light emitting means is energized and said first signal when said light emitting means is not energized and generate a second signal indicative thereof; reference means to establish a reference level for said second signal; detection means to detect a pre-established deviation of a second signal from said reference level and produce a third signal indicative thereof; and output means to produce an output pulse in accordance with said third signal.