Nasal intermittent mandatory ventilation (NIMV) control system in a ventilator

摘要

A ventilator including an inspiration flow control unit and an expiration flow control unit coupled to the inspiration flow control unit. The ventilator also includes a nasal intermittent mandatory ventilation (NIMV) control system coupled to the inspiration flow control unit and the expiration flow control unit. The NIMV control system is configured to automatically and simultaneously adjust an inspiration flow and an expiration flow. A pressure of the inspiration flow is increased from a baseline pressure to a control pressure. A pressure of the expiration flow is returned to the baseline pressure.

主权项

1. A system comprising:
an inspiration flow control unit; and an expiration flow control unit coupled to the inspiration flow control unit, wherein the expiration flow control unit comprises a pressure servo and a flow servo, the flow servo being configured to receive a measurement from an inspiration flow sensor and a separate measurement from an expiration flow sensor, and the expiration flow control unit is configured to add an output of the flow servo to an output of the pressure servo, wherein the inspiration flow control unit comprises an additional pressure servo and an additional flow servo, the additional pressure servo and the additional flow servo being separate from the pressure servo and the flow servo of the expiration flow control unit, wherein the additional pressure servo is configured to generate a flow reference and provide the flow reference to the additional flow servo, wherein the additional flow servo is configured to generate a command for an inspiration flow control valve based on the flow reference and the measurement from the inspiration flow sensor such that the inspiration flow control unit comprises an internal feedback loop for the additional flow servo within an external feedback loop for the additional pressure servo, wherein the output from the flow servo of the expiration flow control unit is based on the measurement from the inspiration flow sensor and the separate measurement from the expiration flow sensor, and wherein an expiration flow control valve is operatively coupled to the expiration flow control unit and is a separate valve assembly from the inspiration flow control valve.