Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure
Patent
1990-09-28
1992-03-31
Burr, Edgar S.
Surgery
Respiratory method or device
Means for supplying respiratory gas under positive pressure
12820418, A61M 1600
Patent
active
050998374
ABSTRACT:
Method and apparatus are described for supplying medical gas such as oxygen to patients through flexible conduiting terminating in a cannula. Pulses of select duration of the oxygen are supplied in response to the negative pressure associated with a detected patient inhalation. Following the supply of a given pulse, the apparatus dwells for a predetermined interval, for example 0.6 seconds, whereupon a next pulse is supplied if inhalation continues. The first pulse supplied in response to any negative inhalation pressure has a quantity corresponding with a prescribed oxygen flow. Thus, subsequent pulses may supply oxygen ambulatory activities of the patient. The apparatus includes a triggering suppression feature avoiding the false pulsing effects otherwise occasioned by pneumatic transients generated by the pulsing technique. Additionally, a pulse triggering sensitivity which is manually adjustable is incorporated with the control circuit of the apparatus. Improved battery charging and stand-by continuous flow circuit metering is incorporated with the apparatus.
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Anderson George A.
Russel, Sr. Larry L.
Burr Edgar S.
Funk Stephen R.
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