Patent ID: 6512938
Filing Date: 2003-01-28
Classification: A61M

Abstract:
A method for adjusting fractionally inspired oxygen delivery to a patient in response to receiving an arterial hemoglobin oxygen saturation signal, said method comprising:a. specifying a plurality of hemoglobin oxygen saturation levels; b. reading the arterial hemoglobin oxygen saturation signal; c. determining if the arterial hemoglobin oxygen saturation signal is a valid signal; d. if the hemoglobin oxygen saturation signal is a not a valid signal, determining a value for the fractionally inspired oxygen delivery to the patient based on backup value; e. if the hemoglobin oxygen saturation signal is a valid signal, i. determining the hemoglobin oxygen saturation level based on the arterial hemoglobin oxygen saturation signal; ii. determining a trend by calculating a slope using a plurality of recent hemoglobin oxygen saturation signals; iii. if a closed loop mode is enabled, determining the fractionally inspired oxygen to deliver to the patient based on the hemoglobin oxygen saturation level and the trend; iv. if the closed loop mode is not enabled, determining the fractionally inspired oxygen to deliver to the patient based on the backup value; and f. delivering the fractionally inspired oxygen to the patient.