Digital waveform generator for automatic respiratory ventilators

Details Digital waveform generator for automatic respiratory ventilators Digital waveform generator for automatic respiratory ventilators

1974-04-16

1977-01-04

Heyman, John S.

Surgery

Truss

Pad

328 72, 1281455, 128DIG17, 340347DA, A03K 1302, H03K 2118, A61H 3100

Patent

active

040017001

ABSTRACT:
A digital system for use in controlling the cycling of a respirator includes a digital clock for dividing each respiratory cycle (inspiration and expiration) into a fixed number of counts. A respiratory rate circuit is adjusted to vary the frequency of the counts to define the total time of each respiratory cycle (in breaths per minute). A respiration ratio circuit is independently adjusted to control the ratio of inspiration time to expiration time for each respiratory cycle by selecting a fixed number of counts to define a desired inspiration time. The remaining counts define expiration time. A digital-to-analog converter is driven in response to the counters to produce a voltage output defining a desired volume-versus-time waveform having the previously selected rate and ratio. The output from the digital-to-analog converter controls the cycling of a volume-cycled respirator. Read-only-memories may be inserted between the counters and the input to the digital-to-analog converter to generate a large number of different inspiration waveforms.

REFERENCES:
patent: 3629710 (1971-12-01), Durland
patent: 3668529 (1972-06-01), Meyer
patent: 3725794 (1973-04-01), Asplund
patent: 3805167 (1974-04-01), Nash et al.
patent: 3873815 (1975-03-01), Summers
patent: 3911899 (1975-10-01), Hattes

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