MINIMIZING IMPOSED EXPIRATORY RESISTANCE OF MECHANICAL VENTILATOR BY OPTIMIZING EXHALATION VALVE CONTROL
First Claim
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1. A method for controlling exhalation during ventilation of a patient on a ventilator, the method comprising:
- determining a control command for an exhalation valve, wherein the control command targets a pressure at the exhalation valve between a minimum pressure and a steady-state pressure for a period of time;
controlling the exhalation valve based on the control command during one or more exhalation cycles;
monitoring an end exhalation pressure and a flow undershoot during the one or more exhalation cycles;
comparing the end exhalation pressure to a predetermined pressure range;
comparing the flow undershoot to a predetermined flow threshold; and
based on the comparing, updating the control command in order to maintain a positive-end expiratory pressure (PEEP) at the end of the one or more exhalation cycles.
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Abstract
This disclosure describes systems and methods for controlling an exhalation valve based on pressure and/or flow measurements during exhalation. The disclosure describes novel exhalation valve controls for ventilating a patient.
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Citations
16 Claims
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1. A method for controlling exhalation during ventilation of a patient on a ventilator, the method comprising:
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determining a control command for an exhalation valve, wherein the control command targets a pressure at the exhalation valve between a minimum pressure and a steady-state pressure for a period of time; controlling the exhalation valve based on the control command during one or more exhalation cycles; monitoring an end exhalation pressure and a flow undershoot during the one or more exhalation cycles; comparing the end exhalation pressure to a predetermined pressure range; comparing the flow undershoot to a predetermined flow threshold; and based on the comparing, updating the control command in order to maintain a positive-end expiratory pressure (PEEP) at the end of the one or more exhalation cycles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A ventilator system, comprising:
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means for determining a control command for an exhalation valve, wherein the control command targets a pressure at the exhalation valve between a minimum pressure and a steady-state pressure for a period of time; means for controlling the exhalation valve based on the control command during one or more exhalation cycles; means for monitoring an end exhalation pressure and a flow undershoot during the one or more exhalation cycles; means for comparing the end exhalation pressure to a predetermined pressure range; means for comparing the flow undershoot to a predetermined flow threshold; and based on the comparing, means for updating the control command in order to maintain a positive-end expiratory pressure (PEEP) at the end of the one or more exhalation cycles.
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12. A computer-readable medium having computer-executable instructions for performing a method controlling exhalation during ventilation of a patient on a ventilator, the method comprising:
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determining a control command for an exhalation valve, wherein the control command targets a pressure at the exhalation valve between a minimum pressure and a steady-state pressure for a period of time; repeatedly controlling the exhalation valve based on the control command during one or more exhalation cycles; repeatedly monitoring an end exhalation pressure and a flow undershoot during the one or more exhalation cycles; repeatedly comparing the end exhalation pressure to a predetermined pressure range; repeatedly comparing the flow undershoot to a predetermined flow threshold; and based on the comparing, repeatedly updating the control command in order to maintain a positive-end expiratory pressure (PEEP) at the end of the one or more exhalation cycles. - View Dependent Claims (13, 14, 15, 16)
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Specification