Method and apparatus for fluid flow control

Details Method and apparatus for fluid flow control Method and apparatus for fluid flow control

1974-08-12

1977-07-26

Kamm, William E.

Surgery

Respiratory method or device

Ozone or ion generation

128214F, 128DIG12, 128DIG13, 222 14, 222 59, 222 63, 222 71, A61M 514

Patent

active

040375986

ABSTRACT:
A digital system wherein a wide variety of different electromechanical output control devices, e.g., stepping motor pump or solenoid actuated I.V. tube pincher, is driven by electrical output pulses of varible frequency and pulse width from a digital pulse generation and control system, the frequency and pulse width of the output pulses being selected and controlled by the system to establish drop flow rates with digital precision over an extremely wide dynamic range. Pulse width is determined by the relative states of a pair of digital counters in a digital memory, frequency being determined by a high, preferably non-integral, multiple of the desired drop flow rate. The equivalent of negative pulse width in the digital memory can be effectively utilized to expand the effective dynamic range of the memory for specified types of electromechanical output devices. A start up subsystem temporarily presets the initial pulse rate and speeds up early regulation. Duty cycle limitation and visual output pulse width monitoring is also provided. Appropriate alarms also respond to a variety of out-of-limit conditions.

REFERENCES:
patent: 3543752 (1970-12-01), Hosse et al.
patent: 3554187 (1971-01-01), Glassner
patent: 3631860 (1972-01-01), Lopin
patent: 3655095 (1972-04-01), Kienitz
patent: 3731679 (1973-05-01), Wilhelmson et al.
patent: 3736930 (1973-06-01), Georgi
patent: 3756456 (1973-09-01), Georgi
patent: 3790042 (1974-02-01), McCormick
Service Manual Pulbication, 500020, IVAC Corporation, 1972.

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