A - Human Necessities – 61 – M
Patent
A - Human Necessities
61
M
340/140, 128/92
A61M 5/14 (2006.01)
Patent
CA 1058469
ABSTRACT OF THE DISCLOSURE This invention relates to improvements in fluid flow control systems for partneral administration of medical fluids. Prior art control systems are generally adaptable for only a single type of output device and are often deficient in their regulating accurately over a wide range of flow rates. The present invention overcomes these deficiencies by providing an apparatus and method for improved accuracy of parenteral administration of medical fluids. The inven- tion includes producing a pulse train of variable frequency and pulse width from a digital pulse generation and control system, the frequency and pulse width of the pulses in the pulse train being selected and controlled by the system to establish drop flow rates with digital precision over an extremely wide dynamic range. The invention pro- vides for monitoring the pulse train driving an output control device used in administration of the fluids, in order to detect a abnormal operation of he administration system. The monitoring involves searching for a first pulse width in a prescribed sequence and searching for a second pulse width in the prescribed sequence dif- ferent from the first pulse width to provide an alarm indication. Duty cycle limitation, appropriate to the particular operating characteristics of the electromechanical output device utilized, is implemented to avoid inducing run-away free flow conditions. Addi- tionally, appropriate alarms respond to system malfunctions to alert medical personnel.
311462
Georgi Heinz W.
LandOfFree
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