Medical infusion apparatus

Details Medical infusion apparatus Medical infusion apparatus

1990-12-17

1993-05-18

Rosenbaum, C. Fred

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

604122, 604134, 604246, 604249, 604250, 128DIG12, 128DIG13, A61M 3100, A61M 500

Patent

active

052116263

ABSTRACT:
Medical infusion apparatus comprises a housing in which a standard flexible liquid reservoir is disposed. A constant-force spring applies pressure to the reservoir to force liquid out of the reservoir and along a conduit to a patient. The spring is energized by the opening of a lid of the housing which permits replacement of the reservoir.
The liquid flowing out of the reservoir passes through a molded conduit part which is configured so that it is positioned at a predetermined location with respect to a flow monitor. The flow monitor injects a pulse of heat, and detects the rate at which the heat pulse travels along the conduit. A microprocessor uses the sensed flow rate to control a stepper motor which regulates fluid flow by squeezing the conduit via a spring-biased member. The apparatus has active and standby modes in which the monitor is operated respectively more and less frequently.

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"Medical Instrumentation", John G. Webster, Houghton Mifflin Company, Boston, 1978, pp. 79-82, 95-96.

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