| 摘要 |
This invention is a medical ventilator (20), and an open or closed loop method of its operation for providing a gas to a patient such that the patient exerts a desired work of breathing during pressure support ventilation, which is monitored, and wherein the pressure and flow of gas is controlled during inspiration to provide a pressure support ventilation level which meets the desired work of breathing level. The ventilator (20) includes pressure (90), and flow (92) sensors in a conduit (54) of the ventilator, which are electrically coupled to a microprocessor (60) which monitors average respiratory muscle pressure, and predicts the patient's work of breathing as a function of the average respiratory muscle pressure, detects when the patient's work of breathing is not within a predetermined range, and generates a signal indicative thereof. The ventilator has a driver circuit (62) electrically coupled to the microprocessor (60), an actuator (26) of the pneumatic circuit which is responsive to the generated signal, and adjusts the pressure level of the breathing gas until it falls within the predetermined work of breathing range. |
