Positive displacement ventilator for breathing assist

In a ventilator, a method of providing an inspiration gas to a recipient, comprising:

• receiving an operation signal identifying a target inspiration gas volume value and a target inspiration gas delivery rate value for provision to the recipient;
• and
• transmitting a drive motor control signal to a drive motor of the ventilator to adjust a number of rotations of an output shaft based upon the operation signal to control inspiratory gas volume, wherein
• transmitting the drive motor control signal to the drive motor comprises:
• transmitting a volume control signal to the drive motor to adjust the of rotations of the output shaft to correspond to the target inspiration gas volume value based upon a predetermined volume of inspiratory gas delivered by a positive displacement pump for each rotation of the output shaft, and
• transmitting a velocity control signal to the drive motor to adjust the rotational speed of the output shaft to correspond to the target inspiration gas delivery rate value.

A ventilator system, comprising:

• a ventilator, comprising:
• a positive displacement pump having a drive motor and configured to output a predetermined volume of inspiratory gas for each rotation of an output shaft of the drive motor, and
• a control unit having a controller comprising a memory and a processor, the control unit disposed in electrical communication with the drive motor, the controller configured to:
• receive an operation signal identifying a target inspiration gas volume value and a target inspiration gas delivery rate value for provision to a recipient, and
• transmit a drive motor control signal to the drive motor to adjust number of rotations of the output shaft based upon the operation signal to control inspiratory gas volume, wherein
• when transmitting the drive motor control signal to the drive motor, the controller is configured to
• transmit a volume control signal to the drive motor to adjust the number of rotations of the output shaft to correspond to the target inspiration gas volume value based upon the predetermined volume of inspiratory gas delivered by the positive displacement pump for each rotation of the output shaft, and
• transmit a velocity control signal to the drive motor to adjust the rotational speed of the output shaft to correspond to the target inspiration gas delivery rate value;
• and
• a patient circuit disposed in fluid communication with the ventilator, the patient circuit configured to direct inspiration gas from the ventilator toward the recipient.