Synchrony between end of ventilator cycles and end of...

Details Synchrony between end of ventilator cycles and end of... Synchrony between end of ventilator cycles and end of...

2004-03-15

2010-10-26

Marmor, II, Charles A (Department: 3735)

Surgery

Diagnostic testing

Respiratory

C600S536000, C600S538000

Reexamination Certificate

active

07819815

ABSTRACT:
Automatic ongoing adjustment of the cycling-off time of ventilator inflation phase during assisted ventilation in accordance with true respiratory rate of a patient. Electrical signals are generated corresponding to the gas flow exchanged between patient and ventilator (flow) and/or to airway pressure (Paw) and the true respiratory rate of the patient (patient RR) is determined on an ongoing basis from the flow and/or Paw. The current average cycle duration of patient respiratory efforts (current patient TTOT) is estimated from patient RR. A current desirable duration of the inhalation phase (desirable TI) is calculated from the product of current patient TTOTa TI/TTOTratio chosen to be in the physiological range, usually 0.25 to 0.50. The ventilator phase is caused to terminate in accordance with the desirable TI.

REFERENCES:
patent: 6439229 (2002-08-01), Du et al.

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