초록 ▼

An open- or closed-loop method and corresponding medical ventilator for providing breathing gas to a patient such that the patient exerts a desired work of breathing during pressure support ventilation, and such that the work of breathing of the patient is monitored and the pressure and/or flow rate

An open- or closed-loop method and corresponding medical ventilator for providing breathing gas to a patient such that the patient exerts a desired work of breathing during pressure support ventilation, and such that the work of breathing of the patient is monitored and the pressure and/or flow rate of the breathing gas provided to the patient is controlled throughout the inspiratory phase to provide a pressure support ventilation level that provides the desired work of breathing in the patient. The medical ventilator includes at least a pressure sensor and a flow rate sensor, disposed in a functionally open ventilator conduit in fluid communication with the lungs of the patient, electrically coupled to a microprocessor to monitor the average respiratory muscle pressure of the patient and to predict the patient work of breathing as a function of the current value of the average respiratory muscle pressure of the patient, to detect when the patient work of breathing is not within a predetermined work of breathing range, and to generate a response signal thereof. Further, the medical ventilator has a driver circuit electrically coupled to the microprocessor and to an actuator of a pneumatic system which, responsive to the response signal, may adjust the selected pressure support ventilation level of the breathing gas provided to the patient by the ventilator until a pressure support ventilation level is reached such that the patient work of breathing is within the predetermined work of breathing range.

대표청구항 ▼

1. A medical ventilator for providing pressure support ventilation to a patient, the medical ventilator in fluid communication with a gas source of one or ignore breathing gases and in flow communication with a functionally open ventilator flow conduit having a patient breathing attachment in fluid

1. A medical ventilator for providing pressure support ventilation to a patient, the medical ventilator in fluid communication with a gas source of one or ignore breathing gases and in flow communication with a functionally open ventilator flow conduit having a patient breathing attachment in fluid communication with the patient, the medical ventilator comprising:a) pressure sensing means disposed within the ventilator conduit for sensing the pressure of the gas within the ventilator conduit; b) flow rate measuring means disposed within the ventilator conduit for measuring the flow rate of the gas within the ventilator conduit; c) monitoring means, connected to the pressure sensing means and the flow rate measuring means, programmed for: a) monitoring a patient work of breathing, and b) determining a selected pressure support ventilation level to maintain the patient work of breathing within a predetermined work of breathing range; and d) gas delivery means for controlling a supply of the gas so that the gas is delivered to the patient at the selected pressure support ventilation level.